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

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 relates to a method for desilicating molten iron by stirring, which belongs to the technical field of molten iron pretreatment. The method comprises four steps: allowing a stirring paddle to stir at a low speed; adding a desiliconization agent; allowing the stirring paddle to stir at a high speed for desilicication; and stopping the stirring paddle. The content of the desilicication agent is kept between 0.05 percent and 0.40 percent; the stirring paddle has a four-blade or three-blade steel structure coated with a fireproof material; the solid desiliconization agent is blown by a blowing device to the surface of the molten iron; the stirring may be realized by continuous or intermittent rotation or alternating clockwise and anticlockwise rotation; in any of the three stirring modes, the stirring paddle can rotate up and down a certain height; and when the method is used, the Si content in the molten iron may be reduced from about 0.50 percent to 0.20 percent, so the desilicication efficiency is over 50 percent. The method can also be used for desilicication during refining raw iron in casting field.

The invention relates to a flotation two-stage desiliconization method for high-silicon bauxite, which is a flotation desiliconization technology for bauxite and belongs to the technical field of mineral processing engineering. The method comprises the following steps of: coarsely grinding the bauxite into particles with certain fine granularity; under the condition of a certain ore pulp concentration, performing flotation first-stage desiliconization by using sodium carbonate as a pH regulator and a dispersing agent of the ore pulp, water glass and sodium hexametaphosphate as a combined inhibitor of gangue mineral, lead acetate as an activating agent of the bauxite, sodium oleate as a collector of the bauxite and pine oil as a foaming agent, wherein the base flow in a flotation groove is a section of silicon-containing tailings; allowing foam products to enter a grinding machine and grinding the foam products into particles with fine granularity; adding the medicaments sequentially and mixing pulp; performing flotation second-stage desiliconization, wherein the base flow in the flotation groove is a section of silicon-containing tailings; and selecting the foaming products for multiple times to form bauxite concentrate. The sectional desiliconization method for 'flotation first-stage desiliconization after coarse grinding and flotation second-stage desiliconization after regrinding rough concentrate' is utilized, so the influence of ore argillization phenomenon on desiliconization is greatly reduced, the flotation desiliconization effect on the high-silicon bauxite is obvious, the silicon dioxide content of the bauxite concentrate can be reduced greatly, the ratio of aluminum to silicon of the bauxite concentrate is increased, and the recovery rate is high.

The invention discloses a method for treating nickel-cobalt hydroxide. The method comprises: (1) using concentrated sulfuric acid and nickel sulfate solution to mature and leach nickel-cobalt hydroxide so as to obtain a mature leachate; (2) mixing the mature leachate and hydrogen peroxide solution for reduction leaching to obtain a reduced Leaching solution; (3) filtering the reducing leaching solution to obtain nickel-cobalt sulfate filtrate and impurity filter cake, wherein the nickel-cobalt hydroxide is obtained by reclaiming nickel-cobalt from laterite nickel ore, and the reducing leaching solution The pH value is 3-5. This method can not only effectively reduce the consumption of auxiliary materials, reduce production costs, and significantly increase the recovery rate of nickel, but also has a remarkable effect of desiliconization and removal of flocculants, and the silicon content in the finally obtained nickel-cobalt sulfate filtrate is not higher than 40mg / L, and the sodium The ion content is not higher than 1.0g / L, and the COD value is not higher than 100mg / L, which can effectively meet the requirements for the production of ternary precursor products.

The invention provides a method for preparing low-silicon pre-melted slag for electroslag remelting. The preparation method comprises the following steps: (1) mixing the slag; (2) melting the slag; (3) adding aluminum Ferroalloying and smelting. According to the preparation method of low-silicon pre-melting slag for electroslag remelting of the present invention, the requirements for equipment are relatively low, the operation is simple, easy to control, and the cost is low; it can effectively solve the problem of easily oxidized elements such as Al and Ti in the electroslag remelting process. The problem of burnout.

The invention belongs to the technical field of alumina production, and specifically relates to a low-temperature continuous dissolution process for bauxite, which includes pipeline dissolution, heat preservation and desilication under pressure, and self-evaporation cooling. The cooled exhaust steam is used for dissolution preheating; the pipeline dissolution is indirect steam heating and dissolution, and there is a heating steam chamber outside the dissolution pipeline, and the spirally coiled dissolution tube from bottom to top corresponds to the feed layer. First-level exhaust steam heating, first-level exhaust steam heating and fresh steam heating. The indirect heating of the bauxite low-temperature dissolution process of the present invention avoids the situation of directly heating the condensed water in the slurry, realizes continuous production, and makes effective use of steam condensed water and exhaust steam waste heat from evaporation and cooling, reducing The amount of steam is reduced, the energy consumption of production is reduced, the operation is simple, it is beneficial to the actual industrial production, and the economic and social benefits are considerable.

The invention discloses a method for controlling compressed air under a non-production mode by virtue of an acid regeneration desilication system, and the method comprises the following step of: intermittently introducing the compressed air when the acid regeneration desilication system is under the non-production mode. By adopting the method for controlling the compressed air under the non-production mode by virtue of the acid regeneration desilication system, the problem that a compressed air tube is blocked under the desilication non-production mode for a long time is solved by accurately controlling the opening time sequence and flow of the compressed air under the desilication non-production mode, and the pH value of acid liquor in a reaction tank is not influenced, so that a desilication system can achieve a good desilication effect in short time after production is resumed.

The invention belongs to the high-valued application field of agricultural solid residues, and particularly relates to a method for preparing porous conductive carbon on the basis of rice husks. The method uses the rice husks as raw materials, conductive carbon is prepared through the catalytic, hole forming and other characteristics of products generated after heating decomposition of zinc carbonate, and the prepared materials has the advantages of being porous, highly dispersed, good in electrical conductivity and the like. According to the technical scheme, the rice husks are smashed first, and desilicication rice husk powder is prepared after hydrofluoric acid desilicication is carried out; zinc carbonate is then added to the desilicication rice husk powder, and the porous conductive carbon is obtained through high-temperature calcination.

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.

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.