116results about "Process efficiency improvement" patented technology

Methods and apparatus are disclosed for recovering metals from metal-containing support materials such as mineral ores. In one embodiment, the metal may be separated from crushed support material or ore in a bioleaching lagoon by the action of hydrocarbon-utilizing bacteria under anaerobic conditions. The bioleached material is then pumped into a precipitation lagoon where hydrocarbon-utilizing bacteria oxidize the metals under aerobic conditions. In another embodiment, metals may be directly biooxidized from a heap of the metal-containing support material having a hydrocarbon/oxygen injection system embedded therein. A water sprinkler system may be used to wet the heap while the hydrocarbon/oxygen injection system stimulates the growth of hydrocarbon-utilizing bacteria. The resulting effluent solution may be pumped or gravity fed to an aerobic precipitation lagoon where aerobic hydrocarbon-utilizing bacteria are used to precipitate or otherwise deposit the metals onto a deposition material.

The invention discloses a method used for selective high-efficiency extraction of copper and bismuth from high-copper bismuth slag. According to the method, high-copper bismuth slag is taken as a raw material; high-copper bismuth slag powder obtained via smashing, grinding, and sieving and a sulfuric acid solution are subjected to size mixing at a certain ratio, and are delivered into a high-pressure autoclave; rich oxygen is introduced into the high-pressure autoclave, and oxygen pressure in the high-pressure autoclave is controlled for oxidizing leaching, wherein in the oxidizing leaching process, leaching of Cu in the form of Cu2+ is realized, and selective separation of copper with other non-zero valent elements is realized; a copper-containing leachate is subjected to acid adjusting, and is subjected to rotational flow electrolysis directly so as to extract copper in the copper-containing leachate and obtain copper products; a leaching residue is subjected to leaching separation of bismuth with concentrated hydrochloric acid, sponge bismuth is obtained via electro-deposition, and product refined bismuth is obtained via refining of sponge bismuth; and the rest slag is delivered into a lead pyrometallurgy system for comprehensive recycling of non-zero valent elements such as Pb, Ag, and Au. No environment pollution is caused by the method, no three wastes are discharged, and the method is a clean metallurgy technology.

The invention provides a synergetic metal recycling method for nickel and cobalt containing waste batteries and copper containing electronic waste. The preliminarily smashed and metal element enriched waste batteries and the copper containing electronic waste are mixed, and a slag former and a reducing agent in a certain ratio are blended for an oxidative reducing reaction; relatively active metal iron, aluminum and the like in the reaction process form oxide to enter an upper layer slag phase; metal cobalt and nickel enter copper liquid on the bottom layer, and therefore the metal phase and a slag phase are separated, and metal containing copper, cobalt and nickel is obtained; and copper, cobalt, nickel and other high-purity metal are recycled through electrorefining. The method is short in flow, high-temperature thermometallurgy is adopted for synergetically recycling the valuable metal in the batteries and the electronic waste, and the problems that traditional waste battery wet recycling efficiency is low, the environment is polluted, a large amount of lixivium needs to be used, and a large amount of acid and alkaline is consumed are avoided; and an efficient novel recycling way is provided for waste ternary battery and electronic waste resource recycling, and good industrial application prospects are achieved.

The invention relates to a method for recycling gold and copper from copper-containing oxidization gold ores, belonging to the technical field of wet-process metallurgy. The method comprises the following steps: firstly, carrying out ore-grinding and pulping onto the copper-containing oxidization gold ores, regulating the pH value by using an alkaline regulating agent in serous fluid and adding a leaching agent; with a titanium-based iridium-coated ruthenium coating electrode, stainless steel or lead alloy as an anode and a graphite plate, a stainless steel plate, a titanium plate or a carbon fiber as a cathode, carrying out leaching-electrodeposition at the current density of 50 A/m<2>-200 A/m<2> under the normal temperature, wherein most of gold and part of copper in the leached-electrodeposited ores are leached out and gathered on the cathode by in-situ electrodeposition reduction; and taking out the cathode plate which is gathered with gold and copper valuable metals as an electrodeposition anode, and carrying out electrodeposition in an electrolytic cell with sulfuric acid, so that anode dissolution-cathode electrodeposition is carried onto the gathered copper, and single-substance gold is collected in the form of anode mud. The method disclosed by the invention has the characteristics of being gentle in reaction condition, simple in process method, short in process flow, low in production cost, energy-saving and synergistic, environment-friendly and the like.

The invention provides a stripping gold component which could remove gold from substrate, comprising: a stripping gold chemical compound; and a assistant conductive compound wherein said stripping gold chemical compound bonds with gold to form covalent bond to strip gold from said substrate, said assistant conductive chemical compound helps the electric conduction and decreases the voltage, said substrate would not be damaged after stripping gold from said substrate, and the stripping gold component is cyanide free.

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 discloses a full extracting process for preparing ultra-pure gadolinium oxide and a product thereof. Compared with the traditional ion exchange and chromatography extraction method, the process has the characteristics of large yield and low cost. The primary-pure gadolinium oxide (Gd2O3 at the grade of 99.99 percent) is obtained in advance by adopting a rough gadolinium enriching substance (Gd3O3 at the grade of 10-90 percent) as a raw material and adopting a mixed extracting agent of P507 and P204 through optimized control of factors, such as material liquid concentration, grade, phase ratio, acidity, and the like and classical extraction and separation in two steps; then the electrochemical reduction and the fully-closed type extraction and separation are performed for carrying out deep purification, and trace rare-earth element impurities are removed; and finally, the ultra-pure gadolinium oxide product with the rare-earth impurity content below 0.5ppm is obtained.

The invention discloses a process for recovering valuable metal from residues containing zinc, comprising the following steps of: adding the residues containing the zinc to a melting furnace; spraying a gas containing oxygen and coal dust into a hearth of the melting furnace from the top and the side part of the melting furnace; discharging molten slag inside the melting furnace into a fuming furnace; spraying the gas containing the oxygen and the coal dust into the molten slag inside the fuming furnace; introducing the gas containing the oxygen above the molten slag inside the fuming furnace; collecting the dust of fumes inside the melting furnace and the fuming furnace; and discharging waste slag inside the fuming furnace. The process recovering the valuable metal from the residues containing the zinc has continuous operation, a large treatment quantity of the residues and high recovery rate of the valuable metal.

The invention provides a roasting-leaching method of fine vanadium slags. The roasting-leaching method includes the following steps: providing the fine vanadium slags; adding sodium carbonate in the fine vanadium slags to obtain roast mixture; roasting the roast mixture at the temperature of 700-850 DEG C to obtain a roast material containing sodium vanadate; water-quenching the roast material to under 100 DEG C; ball-milling the roast material after water quenching to obtain sizing agent; water-leaching the sizing agent to obtain leach sizing agent; and filtering the obtained leach sizing agent to obtain filter residue and lixivium containing the sodium vanadate. The roasting-leaching method at least has one of the following advantages: high efficiency, low cost, low energy consumption, safety and environment-friendly property.

The invention provides a purification method for gallium, which comprises the following steps of pre-purification, freezing crystallization, pickling, and packaging, wherein in the pre-purification step, liquid gallium is put into single equipment containing pickling liquid for stirring reaction, ultrasonic vibration is adopted, and spongy gallium impurities are separated from the liquid gallium preliminarily; in the freezing crystallization step, the liquid gallium separated preliminarily is subjected to freezing crystallization treatment, and heavy metal impurities in the gallium are removed; in the pickling step, the gallium subjected to the freezing crystallization treatment is placed into the single equipment for heating and fusing, a pickling solution is added and stirred, and the gallium is separated from spongy gallium through the ultrasonic vibration after stirring; and in the packaging step, the gallium separated after the pickling step is completed is packaged. The purification method can better achieve a purification effect; the purification flow is simple; the purification method can be automatically controlled easily, and is safe, environment-friendly and power-saving; no special equipment is required; and the enterprise cost is lowered.

The invention discloses a wet method electrolytic metal full-automatic production system. The wet method electrolytic metal full-automatic production system mainly comprises a big unit groove, a negative plate strip, a negative plate strip transmission mechanism, a sliding electricity-conduction device, a load bearing guide rail device and a positive electrode electricity-conduction device. The negative plate strip transmission mechanism is mainly composed of a transmission drum, a block drum and an electric mechanism. The sliding electricity-conduction device is mainly composed of a negative electrode electricity-conduction copper bar and an electricity-conduction copper strip. The load bearing guide rail device is arranged above the sliding electricity-conduction device and mainly composed of a guide rail, a steel wire rope and a guide rail pulley. The positive electrode electricity-conduction device is mainly composed of a positive electrode electricity-conduction copper bar, an electricity-conduction copper rod and a positive plate block. According to the wet method electrolytic metal full-automatic production system, an electrolysis procedure and an electrolysis after-treatment procedure are in seamless joint to form a whole line, and full-automatic production is realized, so that the number of operators on site is further reduced, and a workshop does not need to be attended. The wet method electrolytic metal full-automatic production system is high in production intensification degree, saves resources, reduces environmental pollution, lowers the bath voltage and reduces the direct production cost.

The invention discloses a method for digesting spent rhodium catalyst in carbonyl group synthetic reaction, which is characterized by adding concentrated sulfuric acid into the spent rhodium catalyst in carbonyl group synthetic reaction for carbonization; and then adding alkali metal nitrate solid for digestion until solution of a system is clear and transparent; at this moment, organic matters are digested and removed in a format of carbon dioxide, and rhodium exists in acidic solution in a format of soluble salt. The method disclosed by the invention is high in recovery rate of rhodium, environment-friendly, moderate in operating condition, and high in efficiency.

The invention relates to a process for smelting low-grade laterite, in particular to a process for smelting low-grade laterite through a low-temperature preheating section and high-temperature injecting section method of a rotary kiln in coke-free mode. Low-grade laterite and pulverized coal are placed in the rotary kiln and preheated to the temperature of 800-1200 DEG C, crystallization water in the laterite is dehydrated and dried, part of nickel oxide, iron oxide and chromium oxide are roasted and pre-reduced, then kiln materials are transferred to the high-temperature injecting section and injected through the pulverized coal with the heat quantity of 5500 kilocalories to 6500 kilocalories and pulverized coal degree of nanometer-state 1000 meshes, and the temperature is increased to 1400 DEG C to 1800 DEG C for fast retailoring and producing nickel-chromium-iron. The smelting process uses no coke and is favorable for reducing cost, easy in temperature controlling and production controlling, convenient to operate and apt to achieve mechanization and automation.

The invention relates to a method for recovering copper, nickel and chromium in electroplating sludge. The method for recovering the copper, the nickel and the chromium in the electroplating sludge comprises the steps that the electroplating sludge is subjected to acid leaching treatment through sulfuric acid, and a leaching solution is taken; ammonia water is added into the leaching solution until no sediment is generated, and a precipitate containing chromium element and a reaction liquid are obtained; ammonium ions in the reaction liquid are removed, and thus a treating liquid is obtained;copper ions in the treating liquid are extracted, and an extraction phase containing the copper ions and an aqueous phase solution are obtained; the extraction phase containing the copper ions is extracted back through the sulfuric acid and crystallized, and thus a copper sulphate crystal is obtained; and the aqueous phase solution is crystallized, and thus a nickel sulfate crystal is obtained. According to the method for recovering the copper, the nickel and the chromium in the electroplating sludge, the selectivity to the copper, the nickel and the chromium is good, and the recovery rate ishigh.

The invention discloses a method for preparing industrial molybdenum trioxide by roasting ammonia leaching residue, which comprises the following steps: evenly mixing ammonia leaching residue and molybdenum concentrate in a mass ratio of 1:(4-6), putting the mixture in a rotary kiln, and roasting at 450-680 DEG C for 5-8 hours to obtain the industrial molybdenum trioxide. The preparation method disclosed by the invention is simple, shortens the metallic molybdenum technological process in recycling ammonia leaching residue, lowers the requirement for equipment material and the cost for recycling molybdenum, and increases the metal recovery rate of the ammonia leaching residue. The industrial molybdenum trioxide prepared by the method disclosed by the invention satisfies the requirements for producing ammonium molybdate, ferromolybdenum and other products.

The invention provides a method for recycling rhenium from copper smelting smoke washing waste acid. The method includes the steps that A, the copper smelting smoke washing waste acid is filtered, and clear waste acid and selenium mud are obtained; B, the clear waste acid is mixed with a first precipitation agent to react, and copper-removed later liquid and copper-deposited slag are obtained; and C, the copper-removed later liquid is mixed with a second precipitation agent to react, rhenium-deposited later liquid and rhenium-rich slag are obtained, and in the clear waste acid, the copper content ranges from 0.2 g/L to 3 g/L; or the method includes the steps that A, the copper smelting smoke washing waste acid is filtered, and clear waste acid and selenium mud are obtained; and D, the clear waste acid is mixed with a precipitation agent to react, rhenium-deposited later liquid and rhenium-rich slag are obtained, and in the clear waste acid, the copper content is larger than 0 g/L and smaller than 0.2 g/L. According to the method, the high-copper waste liquid is subjected to copper and rhenium deposition step by step, the low-copper waste liquid is subjected to rhenium deposition in one step, only one kind of auxiliary material sodium thiosulfate is needed in the whole process, the copper recycling rate ranges from 95.3% to 99.8%, and the rhenium recycling rate ranges from 99% to 99.53%.

A method for extracting arsenic from gold ore is characterized by comprising the following steps: taking acidithiobacillus ferrooxidans as a leaching bacterial strain, taking ammonium sulfate, potassium chloride, dipotassium hydrogen phosphate, calcium nitrate and ferrous sulphate as a medium, so as to obtain a bacteria nutrient solution; adding arsenic-containing gold ore powder into the bacteria nutrient solution to prepare an ore pulp, and performing pre-oxidation on ore pulp bacteria; stopping pre-oxidation, filtering and washing the ore pulp; recovering arsenic from the solution, and using the pre-oxidation slag to extract gold; adjusting the pH value of the arsenic-containing solution with sodium hydroxide, filtering, adding copper sulfate into the filtrate, adjusting the pH value of the solution, and performing precipitation, filtering and washing to obtain copper arsenite; and adjusting the pH value of the filtrate from which copper arsenite is precipitated by using calcium oxide, removing precipitation, neutralizing with sulfuric acid and discharging the wastewater reaching the standard. The method provided by the invention is capable of effectively leaching out harmful element arsenic from ore, and the leaching rate of arsenic is more than 90%, so that the arsenic content in ore is substantially reduced, and the comprehensive recovery utilization of arsenic resource in ore is realized.

A process for the hydrometallurgical processing of manganese containing materials, the process characterised by the combination of a manganese dioxide containing feedstock and an acidic solution to form a leach solution, and passing a volume of sulphur dioxide gas through that leach solution, whereby the levels of dithionate ion generated in the leach solution are less than about 5 gl/l. Also described is a process for the production of electrolytic manganese dioxide.

Methods of enhancing the segregation roast through the use of microwave radiation and chloride ions are disclosed. The processes provide means of recovering metals trapped in ores and slags by reaction of these materials with carbon, chloride and water using microwave radiation as the primary energy source. The metals may be present in starting materials such as metallic sulfides, slags, metallic oxides such as laterites, magnetites, iron oxides, silicates and carbonates. The metals are reduced and can be recovered by separation from the gangue. Water, carbon and chloride can be recycled to the reaction to reduce costs.

The invention discloses a method and system for treatment of kiln slag including lead and zinc. The method includes the steps that (1) the kiln slag including lead and zinc is dried, so that a kiln slag dried material is obtained; (2) the kiln slag dried material, pulverized coal and binder are mixed, so that a mixed material is obtained; (3) the mixed material is subjected to pelletizing treatment, so that mixed pellets are obtained; (4) the mixed pellets are fed to a feeding zone of a rotary hearth furnace, the mixed pellets are reduced through a preheating zone and a high-temperature zone of the rotary hearth furnace in sequence, smoke dust containing silver, zinc oxide and lead oxide is exhausted from the preheating zone, and the obtained metallized pellets are discharged from a discharging zone; and (5) the metallized pellets are subjected to ore grinding magnetic separation treatment, and metal iron powder and tailings are obtained. By the adoption of the method, carbon, iron, lead, zinc and silver in the lead and zinc kiln slag can be recycled comprehensively; and moreover, the recovery rate of the iron can reach 80%, the volatilization rate of the zinc can reach 96%, the volatilization rate of the lead can reach 95%, and the volatilization rate of the silver can reach 90%.

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 a method for recovering indium from waste LCDs. The method comprises the following steps: waste LCD panels containing indium tin oxide are dismounted, crushed and then dissolved in an acid solution, and insoluble substances are removed by filtration; the filtrate obtained in the first step is adjusted to an appropriate pH value and then stands for precipitation, and precipitates are removed by filtration; trivalent indium ions in the filtrate obtained in the second step are selectively adsorbed by aminophosphonic acid chelate resin, and then desorbed by a hydrochloric acid solution to obtain a solution containing trivalent indium ions. The method is simple to operate and friendly to the environment, has a good indium separation effect and satisfies mass production.

The invention discloses a boron-phosphorus alloy cast iron used for the cylinder body of an air compressor and a manufacturing process thereof. : Fe 94; C 3-4; Si 2-3; Mn 0.5-1.0; P 0.1-0.5; S 0.05-0.1; B 0.03-0.05. The manufacturing process of the present invention is: raw and auxiliary materials-pig iron, scrap steel-electric furnace smelting-tapping inoculation, inoculation with flow-filtering casting-finished cylinder body. The invention is suitable for making cylinder blocks of air compressors.