36results about How to "Good desiliconization effect" patented technology

The invention relates to a silicon-containing distillate oil hydrofining method, which adopts the method that the silicon-containing distillate oil raw material and hydrogen pass through at least two hydrofining catalyst beds under the hydrofining condition, the silicon-containing distillate oil raw material first passes through a hydrogenising catalyst bed with the silicon catching function, and then passes through a conventional hydrofining catalyst bed; wherein the hydrogenising catalyst with the silicon catching function has a greater pore volume and a specific surface area and a relatively lower metal content. Compared with the prior art, the method has the advantages that the process is simple, the good hydrodesulfurization and hydrodedenitrification performance is kept on the premise of enhancing the silicon-containing ability, and the running period of the device is effectively prolonged. The method can be applied to various silicon-containing distillate oil hydrofining processes.

A floatation process for bauxite to remove S and Si includes such steps as grinding the crude bauxite, adding the yellow catching agent B, reverse floatation for removing S, grinding, adding the match of saponified fatty acid and naphthenic acid, and forward floatation. The resultant bauxite concentrate can be used to prepare aluminum oxide by Bayer method.

The invention discloses a method for treating nickel-cobalt hydroxide. The method comprises the following steps that (1) curing leaching is carried out on the nickel-cobalt hydroxide by adopting concentrated sulfuric acid and a nickel sulfate solution so as to obtain a cured leaching solution; (2) the cured leaching solution is mixed with a hydrogen peroxide solution for carrying out reduction leaching so as to obtain a reduction leaching solution; and (3) the reduction leaching solution is filtered so as to obtain nickel-cobalt sulfate filtrate and an impurity filter cake, wherein the nickel-cobalt hydroxide is obtained by recovering nickel-cobalt from laterite-nickel ore, and the pH value of the reduction leaching solution is 3 - 5. According to the method for treating the nickel-cobalthydroxide, the consumption of auxiliary materials can be effectively reduce, the production cost is reduced, the recovery rate of nickel is remarkably improved, and a remarkable effect of removing silicon and removing flocculant is achieved; and the silicon content in the finally obtained nickel-cobalt sulfate filtrate is not higher than 40 mg/L, the sodium ion content is not higher than 1.0 g/L,the COD value is not higher than 100 mg/L, and the requirements of producing ternary precursor products can be effectively met.

The invention provides a preparing method of low-silicon pre-melted slag for electroslag remelting. The preparing method comprises the first step of even slag charge mixing, the second step of slag smelting and the third step of aluminum iron alloy adding and smelting. According to the preparing method of low-silicon pre-melted slag for electroslag remelting, the requirement for equipment is low, operation is easy, control is convenient, and cost is low. The problem that Al, Ti and elements prone to oxidation are burned down in the electroslag remelting process can be effectively solved.

The invention discloses a method for leaching valuable metal from cobalt-copper white alloy. The method includes the following steps that (1) the cobalt-copper white alloy is melted into an alloy melt, wherein the cobalt-copper white alloy contains silicon and almost contains no manganese; (2) a Mn-containing material is added into the alloy melt, and meanwhile gas is led in for blowing and slagging; (3) obtained slag is separated from the melt; (4) the melt with the slag separated out is atomized into alloy powder, wherein the mass friction of Mn in the alloy powder is 0.5%-20%; and (5) the alloy powder is subjected to acid leaching, and the valuable metal is recovered. Due to the fact that the Mn-containing material is added and reacts with the silicon in the cobalt-copper white alloy to generate the MnO-SiO2 slag, the silicon removal effect is achieved, and the method has the beneficial effects of being good in silicon removal effect and small in valuable metal loss. Besides, the melting temperature is much lower than the melting point of CaO-(MgO)-SiO2 binary system or ternary system slag in the prior art.

The invention discloses a neutralization device and a neutralization method for hydrochloric acid regeneration and desiliconization. The device comprises a neutralization kettle; an inlet section of the neutralization kettle is connected with a waste acid supply pipe and a neutralizing chemical supply pipe respectively; a premixing zone, an aerating and mixing zone, a mechanical stirring and mixing zone and a short effluent stream resisting groove are contained inside the neutralization kettle; the premixing zone is formed by arranging a first clapboard in the inlet section of the neutralization kettle; the short effluent stream resisting groove is formed by arranging a second clapboard in an outlet section of the neutralization kettle; the mechanical stirring and mixing zone is located between the first clapboard and the second clapboard; and the aerating and mixing zone is below the premixing zone, the aerating and mixing zone and the short effluent stream resisting groove and connects the three with each other. According to the invention, the mixing efficiency and the reaction efficiency of the neutralization and oxidization of reactive mixed solution are increased, and the stability of ferric hydroxide is guaranteed, so that the desiliconization efficiency of the waste acid is guaranteed and the recycling of the waste acid is benefited.

The invention discloses a technology and a device for co-producing ofproducing industrial monoammonium phosphate and co-producing high-quality monoammonium phosphate by utilizing middle-grade and low-grade collophanite. The technology comprises the following steps: carrying out ore dressing on the middle-grade and low-grade collophanite by utilizing a heavy medium-double-reverse flotation technology to prepare phosphorus concentrate pulp with the mass percent of 32 percent or more based on P2O5; extracting the phosphorus concentrate pulp by utilizing sulfuric acid to obtain phosphoric acid ore pulp; carrying out high-temperature and vacuum filtering on the phosphoric acid ore pulp under the conditions that the temperature is 83 DEG C to 85 DEG C and the pressure is -0.06MPa to -0.07MPa, so as to obtain a phosphoric acid solution; adding a sedimentation agent into the phosphoric acid solution and carrying out sedimentation and filtering to further remove impurities; finally, obtaining a phosphoric acid solution with the P2O5 beingmass percent of 27 percent to 30 percent based on the P2O5; adding the obtained phosphoric acid solution into an ammoniation reactor and carrying out neutralization on the phosphoric acid solution and ammonia; controlling the neutralization degree to be 1.1 to 1.15 and the reaction temperature to be 90 DEG C to 100 DEG C; after finishing neutralization reaction, cooling and crystallizing; then filtering, and concentrating and crystallizing filtrate to obtain the industrial monoammonium phosphate; concentrating and granulating filtering residues to obtain the high-quality monoammonium phosphate. By adopting the technology and the device, disclosed by the invention, the key problem that the phosphorous content of wet-process phosphoric acid produced by from middle-grade and low-grade phosphorous ore and down-stream products thereof is low is effectively solved.

The invention discloses a de-silicication purifying method for fluorite for pre-melted slag, and belongs to the technical field of fluorite purification. The method comprises the following steps: mixing fluorite in which SiO2 is less than or equal to 1.2 percent with hydrofluoric acid to be leached for 8-13 hours to obtain a leaching liquid, leaching slag and waste gas; washing the leaching slag by using deionized water and drying to obtain a fluorite product; introducing the waste gas into a 4-8 mol/L sodium hydroxide solution for performing innocent treatment; adding industrial-level hydrofluoric acid solution containing 40 percent by weight of hydrogen fluoride into the leaching liquid to prepare a solution with the concentration required by the acid leaching process for cyclic use. The fluorite purification process is simple in procedures, low in energy consumption, and high in cyclic utilization rate; the mass percentages of the obtained fluorite products are that CaF2 is more than or equal to 97 percent, SiO2 is less than or equal to 0.6 percent, and FeO is less than or equal to 0.2 percent; and high-quality raw materials are provided for production of high-quality pre-melted slag, and the fluorite is suitable for being popularized.

The invention discloses a method for treating sulfureous bauxite and relates to the technical field of sulfureous bauxite treatment process. The method includes the steps of grinding, desulfuration by reverse flotation and desilication by obverse flotation, and the step of removing H+, Fe3+ and Fe2+ in ore pulp is added before grinding, between grinding and desulfuration by reverse flotation, between desulfuration by reverse flotation and desilication by obverse flotation, or after desilication by obverse flotation. The ore pulp during flotation desilication can be dispersed sufficiently, index of flotation desilication is increased, and the problem of difficulty in alkaline flocculation of alkaline products of concentrates, tailings or red mud in bauxite beneficiation is solved.

The invention belongs to the field of chemical engineering and metallurgy, and specifically relates to a method of vanadium slag pretreatment desilication and medium circulation. The method of the vanadium slag pretreatment desilication and the medium circulation aims at solving the problems of complicated process, high cost and low desilication efficiency in removing silicon from the vanadium slag. The method comprises the following steps that a, coarse vanadium slag is mixed with calcium material and alkaline medium to wet ball milling, and then the vanadium slag and iron particles are separated after the ball milling; b, a flotation desilicication treatment is carried out to the slurry containing vanadium slag separated from the step a, and the slurry after desilicication is obtained; and c, desilicated slurry after the step b is naturally settled and the alkaline medium and fine vanadium slag are obtained by separation. The silicon in the vanadium slag can be removed to less than 0.5%, the desiliconization effect is good, the technology is simple, the cost is low, and the method is suitable for popularization and application

The invention belongs to the technical field of bauxite desilication and particularly discloses a method for efficient and fast desilication of bauxite. The method for efficient and fast desilication of bauxite includes the steps that bauxite and alkali liquor are mixed and prepared into reaction slurry, the liquid-to-solid ratio of the reaction slurry is 2-50, the reaction slurry reacts in a microwave reactor so that silicon can be dissolved out, reaction temperature is 10-130 DEG C, reaction time is 2-220 min, reaction liquid is subjected to solid and liquid separation after the reaction ends, an obtained liquid phase is a silicon-containing solution, and the SiO2 content in the silicon-containing solution is 0.3-50 g/L. According to the method for efficient and fast desilication of bauxite, reaction is performed in the microwave reactor for desilication, and the purpose of efficiently dissolving out silicon in bauxite is achieved in a short time by determining the liquid-to-solid ratio of the reaction slurry, the reaction temperature and the reaction time. Silicon minerals in bauxite are purified and recycled, no red mud enters the silicon minerals, and therefore the production amount of red mud in alumina production is greatly reduced.