65 results about "Sulfuric acid" patented technology

The invention relates to a technology for extracting zinc, lead and silver step by step by processing zinc-leached residues by a full wet process, and belongs to the technical field of zinc-leached residue recycle. The technology comprises the following steps of: preparing sulfuric acid into an appropriate concentration, and performing two-stage acid leaching in an appropriate liquid-solid ratio and at a high temperature to obtain slurry; filtering and separating the slurry to obtain lead-silver residues and a zinc-containing solution; oxidizing, neutralizing and deironing the zinc-containing solution, and depositing zinc by using sodium sulphide; and eluting the lead-silver residues, blending with caustic lye at an appropriate concentration to obtain slurry at a certain concentration, reacting at a certain temperature and in a certain solid-liquid ratio, and filtering and separating to obtain a filter cake and a filtrate, wherein the filtrate is directly added with sodium sulphide for lead deposition and the filter cake returns to a silver cyaniding leaching process. The technology is short in process, simple in operation, low in cost and mild and loose in reaction conditions; an acid solution and an alkali solution at high concentrations are not required; requirements on equipment are low; the extraction rate of metal is higher than that in the conventional method; no additional waste solid, waste liquid and waste gas are discharged; the recycle of the eluate and the filtrate is realized; and environment pollution is avoided from the source.

The invention belongs to the technical field of storage batteries, and particularly relates to positive lead paste of a storage battery and a preparation method thereof. The positive lead paste comprises following raw materials: 490-510 parts of high-oxidizability lead powder, 490-510 parts of low-oxidizability lead powder, 22-28 parts of red lead, 22-28 parts of yellow lead, 8-12 parts of tetrabasic lead sulfate, 1-3 parts of fumed silica, 1-3 parts of nano-silica, 0.3-0.7 part of terylene staple fiber having a length of 1-2 mm, 0.3-0.7 part of terylene staple fiber having a length of 3-5 mm, 45-55 parts of a sulfuric acid solution having a concentration of 1.4-1.6 g/cm<3> and 45-55 parts of a sulfuric acid solution having a concentration of 1.1-1.3 g/cm<3>. The lead paste is capable of facilitating preparation, filling and coating processes, enhancing the strength of polar plate, reducing the rejection rate of the polar plate, improving the battery capacity, increasing the deep discharging time, prolonging the service lifetime of the battery and improving the comprehensive performances of the battery. According to the lead paste and the preparation method thereof, the method and the design are reasonable, operation is simple, and the production efficiency is largely increased.

The invention discloses a treatment method of carbon felt for vanadium batteries, which comprises the following steps: oxidizing and activating carbon felt in 60-100 DEG C sulfuric acid for 0.5-4 hours or oxidizing and activating carbon felt in 20-30 DEG C sulfuric acid for 12-48 hours, and washing with water to obtain the activated carbon felt. Compared with other sulfuric acid or nitric acid oxidization methods, the invention firstly uses an alkaline solution to soak and wash the hydrophobic oil adhesive substances influencing the oxidizing process on the carbon felt surface, and then carries out the sulfuric acid oxidizing treatment, thereby increasing the oxo groups and other hydrophilic groups on the carbon felt molecules and enhancing the hydrophilicity and electrochemically active ion adsorption capacity of the carbon felt. The invention has the advantages of short treatment time and favorable carbon felt activation effect, and enhances the electrochemical activity of the carbon felt and the generation current value of the carbon felt as the vanadium battery electrode.

The invention discloses a method for preparing pharmaceutical-grade microcrystalline cellulose from cotton linter. The cotton linter is cooked, degreased, bleached, purified, hydrolyzed, filtered, washed, dried and pulverized to obtain the pharmaceutical-grade microcrystalline cellulose, wherein, in the procedure of cooking and degreasing, pulping is performed by the cotton linter ethanol method; and a cotton linter ethanol pulp is prepared according to the volume ratio as 1:4-10 of the absolutely dry mass of the cotton linter to ethanol with 55% of mass fraction, and then the pulp is cooked at the temperature of 190-195 DEG C for heat preservation for 30-90 minutes. In the procedure of bleaching and purifying, an EAPP process is adopted, wherein an E section is the alkali treatment section by adopting NaOH; an A section is the acid treatment section by adopting sulfuric acid; and a P section is the H2O2 bleaching section. For the microcrystalline cellulose prepared by the method, the ash content is 0.0375%, the water content is 4.5%, the degree of crystallization is 63.96% and the granularity is 22.72mu m, and the indexes reach the national standard of the pharmaceutical-grade microcrystalline cellulose.

The invention discloses a method for preparing amorphous ultrafine silicon oxide by a hydrothermal method, which comprises the following steps: adding a surfactant into deionized water, heating to 60-80 DEG C, stirring to obtain a uniformly dispersed solution; slowly adding a silicon source solution into the above solution to obtain a mixed solution, continuing to stir for 5-10 min to allow the mass ratio of the surfactant and SiO2 in the silicon source solution to be 1%-9%; slowly adding sulfuric acid to adjust the pH to 8-12 so as to obtain a silicic acid gel precursor, allowing the mass concentration range of silica in a reaction system to be 1%-9%, transferring the silicic acid gel precursor into a stainless steel high-temperature high-pressure reaction vessel, stirring at 150-500 rpm, sealing the vessel and aging at 140-200 DEG C for 4 hours, after the reaction, allowing the system temperature to decrease to below 80 DEG C, filtering, washing, and drying at 120 DEG C for 2 hours. The method of the invention has low production cost, small silica particle sizes, and simple preparation process, and is easy to realize industrial production.

The invention relates to a novel extraction method of a plant crude drug, namely a method for extracting fucoidan polysaccharide sulfate. The name of the preparation commodity is a haikun shenxi capsule. The method comprises the following main extracting steps: (1) adding 10-fold water to a dried kelp to soak for 8 hours, controlling room temperature at 8-32 DEG C, taking a soak solution to be concentrated into 1/5 of original volume for later use, and separating out alginate on the surface of a marine organism by adopting the step; (2) taking out and cutting up the soaked kelp, and homogenating by using an AH high-pressure homogenizer; (3) adding sodium hydroxide to homogenated liquid to adjust the pH value to 12, stirring for 30 minutes, standing for 12 hours, adjusting the pH value to 1.5-2 by using a hydrochloric acid, stirring for 8 hours, and standing for 12 hours; (4) filtering; (5) merging filtrate with a concentrated solution in the step (1) and desalting by adopting specific 500 electroosmosis; (6) concentrating and decoloring soup; (7) centrifuging, and washing a filter cake by using 95% ethanol; (8) drying and crushing a dry substance. The yield is improved, and the cost is reduced. Compared with the prior art, the yield of the method is improved by over 40% by detection.

The invention provides a soil bio-activator for ginseng continuous cropping and belongs to the field of modernization of Chinese traditional medicine. The soil bio-activator for ginseng continuous cropping can be used for solving the problems of serious ginseng continuous cropping diseases, low yield and poor quality caused by deterioration of the physicochemical and biological characters of old ginseng-grown land soil. The soil bio-activator for ginseng continuous cropping is prepared from 2.0%-8.0% of bacillus subtilis, 2.0%-8.0% of actinomycetes, 5.0%-20.0% of xylanase, 5.0%-20.0% of cellulase, 10.0%-20.0% of urease, 1.0%-4.0% of potassium dihydrogen phosphate, 0.1%-0.5% of ferrous sulfate, 0.1%-0.4% of boric acid, 0.1%-0.5% of manganese sulfate, 0.05%-0.2% of copper sulfate, 0.1%-0.4% of zinc sulfate, 0.05%-0.2% of ammonium molybdate and the balance of organic materials through mixing and compositing. The soil bio-activator for ginseng continuous cropping is used for improving the soil for ginseng continuous cropping in ginseng growing.

The invention provides a preparation method of a corrosion inhibitor of methanol gasoline, and belongs to the technical field of metal corrosion protection. The preparation method comprises steps as follows: alpha-methylstyrene dimer, maleic anhydride, dicumyl peroxide and dimethylbenzene are added into a reactor, and then, the mixture is heated in an atmosphere of nitrogen for reacting; after the mixture is cooled to the room temperature, octadecanol, polyethylene glycol, p-toluenesulfonic acid, n-butyl alcohol and ethyl acetate are added, the mixture is heated for reacting and then cooled to the room temperature, and a mixture I is obtained; the mixture I is washed with a sulfuric acid aqueous solution, then washed with an NaOH aqueous solution and finally washed with an aqueous solution, and a mixture II is obtained; and benzotriazole, 2, 6-tert-butyl-4-methyl phenol, hexamethylene tetramine, ethanol, propargyl alcohol, trimellitate, a surface active agent and a combustion improver are added into the mixture II and uniformly stirred, and the corrosion inhibitor is obtained. The provided methanol gasoline has good solubility with various oils, the additive amount is small, and the corrosion-resistant effect is superior to that of a similar product.

The invention relates to a preparation method of rice hull carbon based solid sulfoacid. The preparation method of the rice hull carbon based solid sulfoacid which can be applied to various acid catalyzed reactions. The preparation method of the rice hull carbon based solid sulfoacid includes the following steps: mixing rice hulls with concentrated sulfuric acid, heating and stirring the mixture, conducting partial carbonization, obtaining solid materials, filtering, water washing and alcohol washing, and obtaining the carbon based solid sulfoacid. The sulfoacid preparation method of the rice hull carbon based solid is simple in operation, short in reaction time, high in density of obtained carbon based solid sulfoacid and capable of bring convenience for industrial implementation and the like, and providing a novel method.

The present invention relates to a method for preparing tungsten oxide and tungsten powder from scheelite. The method uses the scheelite as a raw material and comprises the following steps: (1) conducting leaching reaction; (2) conducting filtering and washing; (3) conducting hydrogen peroxide extraction-decomposition to extract tungsten; (4) conducting hydrogen peroxide multiple dissolution-decomposition to purify tungstic acid; (5) pure tungstic acid calcination to prepare tungsten trioxide; and (6) conducting peroxotungstic acid solution spraying pyrolysis to prepare tungsten oxide and tungsten powder. The method only consumes cheap and easily available sulfuric acid, greatly reduces the decomposition cost of the scheelite and uses sulfuric acid to decompose; decomposed residues are gypsum; the gypsum can be used as building materials; the method does not produce dangerous waste alkali cooking residues, greatly reduces production and operation costs of enterprises, uses hydrogen peroxide as an extractant of tungstic acid, does not produce ammonia nitrogen wastewater, eliminates the technology of producing the ammonia nitrogen wastewater for many years in tungsten smelting, greatly reduces environmental protection costs, directly produces various tungsten end products and tungsten powder, and improves added value of products of the tungsten smelting enterprises.

The invention discloses an analyzing method for quickly and precisely measuring tellurium in a tellurium smelting process. The measuring range of the tellurium in material is 20-95% of mass percent. The analyzing method for quickly and precisely measuring the tellurium in the tellurium smelting process mainly includes steps that weighing a certain amount of sample, adding a proper amount of hydrochloric acid, nitric acid and sulfuric acid dissolving sample, adding bromine water to shield As and Sb interference, and using ammonium ferrous sulfate to titrate the tellurium content under a proper amount of potassium dichromate and thiophosphate. The analyzing method for quickly and precisely measuring the tellurium in the tellurium smelting process uses standard addition test and parallel test to verify the accuracy and precision of the method; the analyzing method for quickly and precisely measuring the tellurium in the tellurium smelting process is high in precision and capable of meeting the actual needs of the analysis and detection for the tellurium content in the material in the tellurium production process.

The invention belongs to the technical field of chemical engineering, and relates to a method for preparing particle boric fertilizer. The method takes decahydrate, borax penta hydrate and concentrated sulfuric acid as raw materials, and the raw materials are mixed, granulated, screened and dried to prepare the particle boric fertilizer. The process of the method is simple and easily realized, and the particle boric fertilizer produced by the method is favorable fot the uptake to crop, is convenient to transport and has quite wide application prospect.

A method for preparing bio-diesel by using reverse micelle catalyst is specifically suitable for the resource utilization of various waste oil such as tailings of oil plants, cooking oil, waste oil, soapstock, swill oil and so on to directly transform waste oil into the increasingly demanded diesel substitute, i.e. bio-diesel, in a reverse micelle catalysis system. The reverse micelle catalyst is composed of surfactant, water and alcohol at a proper ratio. The method comprises the following steps: adding sulfuric acid in the waste oil, introducing steam, boiling, washing with water, and separating to obtain an acidified oil layer; and adding a reverse micelle catalyst at an amount of 0.5 to 10% that of the oil and alcohol at an amount of 10 to 50% that of the acidified oil slowly, stirring at a speed of 1,500 to 3,000 rpm to form a reverse micelle catalysis reaction system, heating and reflowing for 3 to 10 h, washing with water, standing to obtain crude bio-diesel, and distilling at 200 to 250 DEG C and under 0.001 to 0.0001MPa to obtain the pure bio-diesel with a total yield above 75%. The method has the advantages of simple and reliable process flow, high production efficiency, low energy consumption and less waste water discharge.

The invention discloses a preparation method of 4-nitroimidazole. The preparation method comprises the steps of preparing disulfated imidazole salt from concentrated sulfuric acid and imidazole, and adding an N2O5<-1> mixed acid nitrating agent, so as to prepare 4-nitroimidazole. Compared with the prior art, the preparation method has the beneficial effects that the reaction yield is high and can reach 95.5%; meanwhile, nitrification of partial concentrated nitric acid is replaced by nitrogen pentoxide, so that the consumption of concentrated nitric acid is reduced, the reaction temperature is decreased, the reaction time is reduced, the generation of waste acid is reduced, the cost is saved, meanwhile, the environmental friendliness is achieved, and the industrialization of 4-nitroimidazole is facilitated.

The invention relates to an aluminum alloy surface treating technology and particularly relates to an aluminum alloy surface titanium dioxide conversion coating solution and a using method thereof. The aluminum alloy surface titanium dioxide conversion coating solution is an aqueous solution which contains titanium salt and fluoride, and the pH value of the aqueous solution is regulated to 3.5-4.5 by using non-reducing acid. After being pretreated, the surface of aluminum alloy is soaked into the aluminum alloy surface titanium dioxide conversion coating solution for 1-15min, thus a conversion coating is formed on the surface of the aluminum alloy. According to the invention, the chemical conversion treatment is carried out by using titanium salt instead of chromic acid, the surface of the aluminum alloy is etched by using low-concentration fluorine ions, and titanyl sulfate or titanyl nitride is induced to hydrolyze to generate a titanium dioxide conversion coating on the surface of the aluminum alloy, wherein the titanium dioxide conversion coating is uniform in color and luster and excellent in corrosion resistance. The titanium salt is nonpoisonous, the conversion solution is simple in component, no great number of energy is consumed, and no environment hazards are caused, therefore, a clean production process is achieved.

The invention discloses a technology for producing potassium sulphate by a liquid-phase grouting method. The technology comprises the steps of adopting concentrated sulfuric acid or dilute sulphuric acid and industry waste acid and potassium chloride as a raw material; carrying out double decomposition reaction on sulfuric acid and potassium chloride in a liquid phase; producing potassium sulphate through concentrating and grouting processes, cooling the potassium sulphate, and simultaneously neutralizing a free acid by adopting calcium carbonate powder; and finally obtaining agricultural potassium sulphate meeting the GB20406-2006 standard. The potassium chloride is high in conversion rate and short in reaction time, and a potassium sulphate product is high in quality. Furthermore, the disadvantages of serious corrosion and high energy consumption of a Mannheim method are overcome; and the problems that other double decomposition methods are complicated in potassium sulphate production procedure and the product is low in quality are solved.

The invention discloses methods for producing fulvic acid salt, fulvic acid salt water-soluble fertilizers and aquatic nutrient solution from alcohol waste liquid from waste molasses. The method for producing the fulvic acid salt from the alcohol waste liquid from the waste molasses includes steps of 1), carrying out acidification reaction, to be more specific, adding the alcohol waste liquid from the waste molasses into sulfuric acid solution with the concentration of 30-55%, carrying out stirring acidification reaction, then adding potassium salt into first reaction products, dissolving the potassium salt and continuously stirring the potassium salt and the first reaction products until reaction is completely carried out to obtain products with fulvic acid; 2), carrying out salt forming reaction, to be more specific, adding prepared alkaline solution into the products, obtained at the step 1), with the fulvic acid, carrying out stirring reaction until the products are alkalized and salt is formed, and then cooling the salt until the temperature of the salt reaches the room temperature so as to obtain the fulvic acid salt. The fulvic acid salt water-soluble fertilizers and the aquatic nutrient solution further can be obtained from the fulvic acid salt. The methods have the advantages that the problems of pollution on natural environments and disruption of ecological balance due to discharge of waste liquid obtained after alcohol is produced from existing waste molasses can be solved by the aid of the methods, and excellent economic benefits further can be created.

The invention relates to a lead paste of a lead acid storage battery with a long service cycle. The lead paste comprises a negative electrode lead paste and a positive electrode lead paste, wherein the negative electrode lead paste is prepared from the following raw materials in parts by weight: 100 parts of lead powder, 10 to 12 parts of sulfuric acid, 10 to 12 parts of deionized water, 2 to 5 parts of lignin sodium sulfonate, 0.1 to 1 part of lignin fiber, 0.4 to 0.8 part of gallic acid, 1 to 3 parts of aerosil, 1 to 6 parts of colloidal graphite powder, 1 to 4 parts of barium sulfate, and 0.2 to 0.6 part of oak powder; the positive electrode lead paste is prepared from the following raw materials in parts by weight: 100 parts of lead powder, 10 to 12 parts of sulfuric acid, 10 to 12 parts of deionized water, 4 to 8 parts of red lead, 1 to 3 parts of carboxymethylcellulose, 0.1 to 1 part of lignin fiber, 0.4 to 0.8 part of magnesium sulfate, and 1 to 3 parts of aerosil. A storage battery prepared by the lead paste has the advantages that the initial capacity is high, the cycle life is long, the charging speed and discharging speed of the lead acid battery are accelerated, and the service life of the lead acid battery is prolonged.

The invention belongs to the field of a geotechnical test in civil engineering, and concretely relates to a multifunctional testing apparatus for on-site determination of expansion of sulfuric acid salinized soil saline. The apparatus comprises a soil pond, a separator plate, an earth pressure box, a temperature sensor, a vertical displacement observation mark post, and a plastic pipe; a cross section of the soil pond is in a rectangular shape, and the soil pond is enclosed by adjacent two reinforced concrete walls and adjacent two masonry walls, the separator plate is vertically placed between two long edges of the soil pond, and the soil pond is separated to a compartment. The earth pressure box is buried at an inner side of the wall of the soil pond, the temperature sensor is buried ata to-be-detected soil sample in each compartment, and the vertical displacement observation mark post is vertically arranged at the center of the compartment. The through-holes are arranged at the wall at the bottom of two short edges of the soil pond, the through-hole is connected with the plastic pipe filled with a sodium sulfate solution, and the solution is penetrated into the to-be-detected soil sample through a middle sand cushion layer at the bottom of the soil pond. The multifunctional testing apparatus can be used for measuring expansion ratio and bulging force of different types of salinized soil under different temperatures and different lateral constrained conditions.

The invention discloses a composite electrode material, a preparation method and a super capacitor. The preparation method of the composite electrode material comprises: after carbon cloth loaded withCo-MOF is calcined, obtaining carbon cloth loaded with Co<3>O<4> nanosheets; and taking the carbon cloth loaded with the Co<3>O<4> nanosheet as a working electrode, and carrying out electrodepositionin an electrolyte to obtain the composite electrode material. The electrolyte comprises aniline and 0.8 to 1.2 M of sulfuric acid, and the electro-deposition time is 10 to 14 minutes. The compositeelectrode material provided by the invention is the composite electrode material in which carbon cloth is loaded with core-shell structure nanosheets, wherein the core is Co<3>O<4> nanosheets, and theshell is made from polyaniline. According to the composite electrode material disclosed by the invention, the Co<3>O<4> nanosheets obtained in preparation and the core-shell structure nanosheets in aproduct uniformly grow on carbon cloth, and collapse is avoided; and the composite electrode material can be directly used as a working electrode, is high in specific capacitance, good in cycling stability and large in specific surface area, and can improve the utilization rate of active substances.

The invention discloses a method for preparing calcium hydrophosphate through double-acidolysis of phosphorite. The method is characterized by comprising the following steps of ore pulp preparation, conduction of a hydrochloric acid acidolysis reaction, conduction of a sulfuric acid acidolysis reaction, first-segment neutralization, second-segment neutralization, third-segment neutralization, hydrochloric acid regeneration and calcium sulfate precipitation. The method has the advantages that ores are subjected to acidolysis more fully through two steps of acidolysis reactions, and food-grade calcium sulfate is generated when hydrochloric acid is regenerated.

The invention belongs to the field of metal pickling inhibitors and discloses an environment-friendly carbon steel pickling inhibitor. The environment-friendly carbon steel pickling inhibitor is composed of polyaspartic acid and chloride ions. Application of the environment-friendly carbon steel pickling inhibitor includes: adding 0.5-5g/L polyaspartic acid and 0.001-0.005mol/L chloride ions into a pickling solution which is a sulfuric acid solution with the concentration being 0.5-1mol/L, controlling the temperature to be about 20-40 DEG C, adding to-be-pickled carbon steel and products thereof, and soaking for 0.5-2h. The environment-friendly carbon steel pickling inhibitor is effective in corrosion inhibition, and the polyaspartic acid is a water-soluble macromolecular substance; a preparation method of the inhibitor is simple, production conditions are mild, and applying the inhibitor to the pickling solution can effectively prevent unnecessary loss of the carbon steel and products thereof in a pickling process. In addition, the environment-friendly carbon steel pickling inhibitor has the advantages of environment friendliness, extensive source, wide market prospect and high application value.

The invention belongs to the field of chemical synthesis, and particularly relates to a preparation method of 2-methylaziridine. The 2-methylaziridine is synthesized from isopropanolamine, sulfuric acid and liquid caustic soda as raw materials, the synthesis condition is mild, and mass industrial production is facilitated. Besides, the synthesis materials are simple, sulfate esterification and liquid caustic soda hydrolysis are adopted, caustic soda flakes are used for purification in the distillation and purification process, few byproducts are produced, and the method is green and environmentally friendly; initial distillation under normal pressure and fine distillation under low pressure are adopted, and the obtained 2-methylaziridine has the purity of 99% or above.