16 results about "Magnetic separation" patented technology

The invention discloses a benefication method for recovering specularite. The method comprises the processes of primary grinding, grading, primary low intensity magnetic separation, and tailings discarding by primary high intensity magnetic separation; rough concentrate pre-classification by the primary low intensity magnetic separation and the primary high intensity magnetic separation, secondary grinding, secondary low intensity magnetic separation to obtain concentrates, secondary high intensity magnetic separation to obtain concentrates; and selective flocculation desliming secondary conducted on high intensity magnetic separation tailings (middlings), and anionic reverse flotation. The method further comprises the step of arranging a cylindrical slag separating sieve before the primary high intensity magnetic separation. With the advantages that the iron concentrate grade and the iron recovery are high, the loss of granular iron minerals is low, the mineral process flow is short, concentrates and tailings can be obtained in advance and the energy consumption of the benefication is low, the invention can be used not only for selecting specularite ores, but also for selecting weakly magnetic iron minerals, such as hematite, goethite, siderite, limonite, and the like.

The invention relates to a method for processing red mud by utilizing iron pyrites, comprising the following steps of: uniformly mixing air-dried red mud and the iron pyrites according to a certain proportion; and then heating under the condition of oxygen isolation so as to transform Fe2O3 contained in the red mud into magnetic Fe3O4. The red mud processed by utilizing the method disclosed by the invention is not only neutralized in alkalinity, but also has iron oxide content being less than 2 percent and can be used as a fire-resistant raw material; in addition, the iron oxide obtained through magnetic separation can be used as an iron smelting raw material.

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 invention provides a mineral separation and enrichment method for a primary scandium ore. The method comprises the steps of crushing, ore grinding, low-intensity magnetic separation, high-intensity magnetic roughing and scavenging, concentrate regrinding, high-intensity magnetic concentration and the like. A scandium concentrate obtained by using the method disclosed by the invention is subjected to wet-metallurgy scandium extraction, so that the scandium ore resource becomes a developable and utilizable resource, the production efficiency of wet-process scandium extraction can be effectively increased, the consumption of various auxiliary materials such as acid and alkaline required by wet-process scandium extraction and the production cost can be remarkably reduced, and environment pollution caused by a wet-process scandium extraction process is reduced. Meanwhile, the produced tailings can be recycled in the industries such as building materials, the chemical industry, ceramics and glass, so that the comprehensive recycling value of the resource is increased, and the ecological and environment protection influences caused by tailing accumulation and storage are reduced.

The invention discloses a method for preparing bioactive peptide from immobilized bi-enzyme of composite carrier magnetic nano-particles. The method includes the steps of (1) preparing Fe3O4 magnetic nano-particles, (2) preparing chitosan solution and sodium polyphosphate solution and mixing the two to obtain a composite carrier solution, adding in the Fe3O4 magnetic nano-particles with stirring, carrying out magnetic separation, washing with water and then drying to obtain composite carrier magnetic nano-particles, (3) preparing bi-enzyme solution of alkaline protease and trypsin, adding in the composite carrier magnetic nano-particles with stirring, then adding in glutaraldehyde aqueous solution dropwisely, carrying out a cross linking and adsorption method to obtain the immobilized bi-enzyme of the composite carrier magnetic nano-particles, and (4) preparing a plant-caused protein solution, adding in the immobilized bi-enzyme to obtain the bioactive peptide. The method has the advantages of environmental friendliness and low cost, completely takes full advantages of composite of two types of proteases, and improves yield and antioxidant activity of the bioactive peptide. The immobilized bi-enzyme of the composite carrier magnetic nano-particles is small in particle size and is of superparamagnetism.

The invention discloses a preparation process and system for producing a high-grade titanium-rich material by utilizing ilmenite, and belongs to the field of chemical engineering and metallurgy. The preparation process comprises the following steps: putting ilmenite concentrate into a first rotary kiln, and then adding a reducing agent and a desulfurizing agent for primary reduction, so as to obtain a reduced material I; enabling tail gas to pass through high-temperature cyclone dust removal equipment, an oil-gas separator, a Roots blower and a gas holder in sequence, and finally, conveying reducing gas to a second rotary kiln; cooling the reduced material I, and then removing impurities through a screening machine and a magnetic separating machine, so as to obtain a pure uniform-particle-size ferrotitanium inlay; feeding the ferrotitanium inlay to the second rotary kiln for secondary reduction, so as to obtain a reduced material II; and cooling the reduced material II, and performingthe grinding-separating operation and the magnetic separating operation in sequence, so as to obtain an iron product and the titanium-rich material. The preparation process has no restriction on the selection of raw materials; the equipment failure rate is low; the treatment of tail gas is simple; the environment-friendly and energy-saving properties are achieved; the metallization rate of the obtained iron product reaches 98% or higher; the content of titanium dioxide in the titanium-rich material is higher than 90%; and the number of particle meshes and the density meet the product requirements.

The invention provides a reusable nano core-shell structure mimic enzyme material and a preparation method thereof. The preparation method comprises the steps: taking an iron source and an ammonium source, adding the iron source and the ammonium source into a solvent, performing ultrasonic stirring to obtain a mixed solution A, reacting the mixed solution A under a first preset condition, performing magnetic separation, then washing, and drying to obtain magnetic nano iron; and performing ultrasonic stirring on the magnetic nano iron, a manganese source and an ammonium source in deionized water to obtain a mixed solution B, performing reaction on the mixed solution B under a second preset condition, performing magnetic separation, then washing, and drying to obtain the reusable nano core-shell structure mimic enzyme material. The preparation process is simple, the raw materials are simple and easy to obtain, and the method is biological and environment-friendly and can be suitable for industrial large-scale production, and the prepared product has the characteristics of magnetic separation and recycling, still keeps extremely high enzyme activity in regeneration and recycling, and has a wide application prospect.

The invention discloses a refining process of monosodium glutamate. The process comprises the following steps of: firstly, taking corns as a raw material; fermenting, separating and extracting to obtain glutamic acid; then mixing the glutamic acid with sodium carbonate in a water environment to obtain a neutralized solution; then de-coloring the neutralized solution by utilizing a magnetic nano material and carrying out magnetic separation to obtain a de-colored solution; then de-coloring the de-colored solution again through an exchange column containing anion resin; and finally, crystallizing, separating and drying to obtain the monosodium glutamate. The refining process disclosed by the invention is simple and the quality of the monosodium glutamate is greatly improved; the industrial application value is high.

The invention relates to the technical field of silicon carbide, in particular to silicon carbide ultrafine powder and a production method thereof, and the preparation raw material of the silicon carbide ultrafine powder is in-situ synthesized high-purity 6H-SiC micro-powder with a particle size of 2-5 mm. The production method comprises the following steps: carrying out ball milling on a siliconcarbide particle raw material; adding a foaming agent and mixed acid, carrying out a de-acidification treatment; carrying out magnetic separation by adopting a wet magnetic separator; adding a surfactant to react; carrying out microwave drying, and using an ultrasonic rocking sieve to perform screening so as to obtain silicon carbide ultrafine powder. The silicon carbide produced and prepared by the method is high in purity, the production efficiency is greatly improved, the production cost is reduced, products are consistent in density, uniform in composition and structure and good in reliability, and the silicon carbide ultrafine powder has a market prospect and is suitable for popularization.

A transmission device special for municipal waste comprises a motor, a transmission rail, a transmission roller, a sheet-shaped conveying belt, an air blower, a winnowing air duct, a winnowing baffleplate, a winnowing bag, a magnetic separation machine, a magnetic separation scrapping head and a magnetic selection conveying belt. The no-load working time of the sheet-shaped conveying belt is reduced, and the special transmission device is loaded with a winnowing and magnetic section device; light waste is selected and collected by the air blower, the winnowing baffle plate and the winnowing air duct; metal and magnetic waste in the waste are absorbed by the magnetic separation conveying belt, the magnetic selection machine and the magnetic selection scrapping head, and sorting of life waste during the transmission process is achieved; and the equipment is simple and has an obvious sorting effect.

The invention relates to the technical field of mineral separation, in particular to a comprehensive utilization method of pegmatite containing tantalum, niobium, cassiterite, feldspar and spodumene. The comprehensive utilization method of the pegmatite comprises the following steps: crushing and grinding raw ore, and then carrying out flotation, magnetic separation, reselection, concentration, dehydration, precipitation and clarification combined mineral separation process, so that valuable mineral resources such as mica, tantalum-niobium ore, cassiterite, feldspar, spodumene, building material sand and the like contained in the pegmatite can be recycled; the method has the advantages that the method is simple in process, high-quality recovery of spodumene concentrate and feldspar concentrate products and the like can be achieved, the comprehensive recovery utilization rate is high, nearly zero emission of tailings and tail water can be achieved, the method is suitable for large-scale production and application, and stable beneficiation indexes can be kept.