219results about How to "High product purity" patented technology

Purification method of silicon carbide superfine micropowder

The invention discloses a purification method of silicon carbide superfine micropowder, which comprises the following steps: mechanically crushing and shaping the selected silicon carbide raw material, washing the shaped raw material with initial water to remove carbon and magnetically separating the washed raw material to remove partial impurities on the surface; airing and drying the raw material washed with initial water, and carrying out crushing by a raymond mill and air flow classification to produce a product the grain diameter of which is between 1 and 15mu m; adding the product into a purification kettle, adding water to produce slurry, adding a flotation agent for floating to remove carbon, wherein the floating agent is kerosene and terpineol; respectively adding hydrochloric acid, sulfuric acid and hydrofluoric acid into the purification kettle; stirring the mixture and then washing with water until the pH value reaches about 7; adding solid sodium hydroxide and solid calcium hydroxide into the purification kettle then washing with water after stirring; and feeding the washed mixture to a classification kettle for classification after the pH value reaches 7. Through the purification treatment by using silicon carbide, the superfine micropowder is easy to separate. The product has the advantages of high purity, small grain diameter distribution, uniform grains, fewer impurities, high quality and wider application range.

Method and system for refining cyclohexanone and recycling cyclohexanol

The invention discloses a method and a system for refining cyclohexanone and recycling cyclohexanol. The method is characterized by comprising the following steps: sending an alcohol ketone mixture into a light-component removal tower for removing light components, sending the material discharged from the tower bottom into a cyclohexanone product tower, acquiring a high-purity cyclohexanone product from the tower top and a crude product mainly comprising cyclohexanol from the tower bottom, then sending the crude product into a cyclohexanol recovery tower, and acquiring cyclohexanol from the tower top; mixing the acquired cyclohexanol with proper amount of water, heating and sending into a cyclohexanol dehydrogenation reactor for dehydrogenation, so as to obtain a mixed product containing cyclohexanol, cyclohexanone and water, performing two-stage cooling on the dehydrogenated product, then performing gas-liquid separation, sending the gas phase and the liquid phase into a dewatering tower for dewatering processing, sending oil-containing wastewater removed at the tower top to a cyclohexane extraction tower, sending an obtained upper-layer oil phase to an alcohol-ketone recovery tower, and sending an oil phase containing cyclohexanone and cyclohexanol and obtained at the bottom of alcohol-ketone recovery tower to a dewatering tower for cycling. The invention comprises the advantages that the product cyclohexanone is high in purity, cyclohexnoal is efficiently converted into cyclohexanone at a high yield, and the system is high in energy integration degree and low in energy consumption.

Method for preparing silica through coal gangue aluminum extraction waste slag

The invention relates to a method for preparing silica through coal gangue aluminum extraction waste slag. The method comprises the following steps: firstly, mixing the coal gangue aluminum extraction waste slag with quartz sand while enabling the SiO2 content of the mixture to be larger than or equal to 90% and the Al2O3 content of the mixture to be smaller than 6%; then according to the molar ratio of 1: (0.3-1) of SiO2 to sodium carbonate, adding the sodium carbonate to the mixture; grinding the mixture into particles with diameters of 50-200 [mu]m; placing the particles in a converter at 750-830 DEG C for fusing reaction for 1-5 hours, so as to obtain coarse sodium silicate particles; dissolving the coarse sodium silicate particles in a high-pressure reaction kettle to obtain a sodium silicate solution; diluting the sodium silicate solution to 5-15 baume degrees; leading CO2 produced during the process of the fusing reaction to the diluted sodium silicate solution for carbonation, so as to obtain the silica. The solubility of the solid sodium silicate prepared according to the method can reach up to 90%. The silica conforms to the national standard; the oil absorption rate of the silica is larger than 3.1 ml/g. Through the adoption of the method, the comprehensive utilization rate of coal gangue is improved, CO2 produced during the process of the fusing reaction is eliminated by dissolving, and emission of three wastes is reduced.

Method for treating magnesium sulfate and magnesium sulfite wastewater by virtue of lime method

ActiveCN105858692AHigh calcium and magnesium separation coefficientHigh product purityCalcium/strontium/barium sulfatesSolution crystallizationMagnesium carbonate hydroxideChemistry
The invention discloses a method for treating magnesium sulfate and magnesium sulfite wastewater by virtue of a lime method. Technical steps comprise settling purification, aeration oxidization, reactive crystallization separation, overflow liquid filtering, washing and drying, kettle-bottom slurry washing and separation and filtered stock recycling. Purified and oxidized wastewater and lime slurry are continuously added into a reaction crystallizer respectively, and a reactive crystallization condition is controlled to bond sulfate ions and calcium ions to form and settle calcium sulfate dihydrate crystals with larger particle sizes at the bottom of the reactive crystallizer and bond magnesium ions and hydroxide ions to form magnesium hydroxide with smaller particle sizes to continuously overflow from an overflow opening of the reactive crystallizer. The method has the characteristics of simple procedures, high separation efficiency, low equipment investment and running cost and the like, and can be used for treating magnesium sulfate and magnesium sulfite wastewater in large batches. Reaction products can be used for preparing high-quality magnesium hydroxide and calcium sulfate dihydrate for selling as chemical products; reaction mother liquor can be used as process water instead of fresh water, so that zero emission of magnesium sulfate and magnesium sulfite wastewater can be implemented.

Preparation method and purpose for iron oxide-based anode material for lithium ion battery

The invention discloses a preparation method and purposes for an iron oxide-based anode material for lithium ion batteries. The method comprises the following steps: 1) dissolving a ferric salt precursor in water, adding combustion agents after mixing uniformly, and after mixing uniformly, adding ammoniacal liquor to adjust the pH value; 2) placing the solution obtained in water bath for heating and evaporating, until the formation of viscous gel; 3) placing the gel in a muffle furnace for combustion reaction to obtain Fe2O3 powder; 4) obtaining a Fe3O4/C composite material after heat treatment at the temperature of 400-800 DEG C in the argon atmosphere of the Fe3O4 powder and an organic carbon source, wherein the carbon accounts for 0.5-40% by mass of the Fe3O4/C composite material. The Fe2O3 powder and the Fe3O4/C composite material prepared by using the method are used for preparing anode materials for lithium ion batteries. The method is simple and controllable and can be used in mass production; the Fe3O4 powder prepared by the method has a large specific surface area, and high purity; and by using the Fe3O4/C composite material prepared through reduction carbon coating as the anode material for lithium ion batteries, the batteries has high specific capacity, and good cycle stability and multiplying power performance.

Preparation method of high purity porous carbon

InactiveCN108128774AHigh product purityAvoid complex processCarbon compoundsWater solubleHigh polymer
The invention discloses a preparation method of high purity porous carbon. The preparation method comprises the following steps: mixing alkaline metal salt easily dissolved in water with a water soluble high molecular material for a pre-reaction to obtain a mixture, wherein the high molecular material is prepared from one or more of resin, cellulose and a cellulose derivative; then crushing the mixture to particles, the grain sizes of which are 0.01-5mm; heating the particles to 600-1000 DEG C for 0.5-8h at a heating rate of 1-20 DEG C/min in an inert atmosphere, and carbonizing and activatingthe particles to prepare porous carbon; and finally, soaking the cooled porous carbon with a solution to dissolve residual alkaline metal salt, and washing the porous carbon for many times and dryingthe same to obtain the porous carbon. According to the preparation method of high purity porous carbon, the specific surface area of the prepared porous carbon reaches up to 1200-2100m<2>/g; the residual alkaline metal salt can be fully dissolved and removed only with water without processes such as pickling, the ash content is lower than 0.5%, the porous carbon is free of impurities such as ferrum and chlorine, the product quality is high, the service life of the equipment is prolonged favorably, and the environmental pollution is reduced.
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