8results about How to "Reduce silicon content" patented technology

This invention belongs to the field of metal purification technology and discloses a method for preparing high-purity indium with low silicon content, comprising the following steps: Step 1: Place the indium raw material into a hydrogenation furnace and evacuate to a vacuum degree of 5*10 ‑3 Pa-8*10 ‑3 Step 2: Purge with inert gas to atmospheric pressure and maintain the pressure for 30 minutes; Step 3: Replace the inert gas with hydrogen gas, turn on the heater to raise the temperature to 400-600℃, and maintain the temperature for 1-2 hours to obtain the low-silicon content high-purity indium. This invention discloses a method for preparing low-silicon content high-purity indium, which can reduce the silicon content in high-purity indium to <10 ppbw, effectively improving the performance of high-purity indium.

The invention relates to the technical field of precious metal metallurgy, and discloses a high-density iridium ingot sedimentation type smelting process which comprises the following steps: preparing a water-cooled copper crucible with a zirconium oxide inner wall coating; iridium powder and calcium oxide powder are mixed and put into a crucible; performing induction heating in a vacuum environment until the raw materials are molten; protective gas is inflated, periodic variable-pressure oscillation operation is applied under the condition that the temperature of the melt is kept, and slag crust on the surface of the melt is destroyed through pressure fluctuation and deep gas is promoted to be exhausted; after oscillation is stopped, the melt is left to stand, and a slag system floats upwards and is separated; and establishing a bottom-to-top temperature gradient to control directional solidification of the melt. According to the invention, oxide hard shells are destroyed through a variable-pressure oscillation mechanism, and efficient degassing and impurity removal are realized by cooperating with calcium oxide slagging; the zirconia coating effectively prevents the crucible material from being polluted; the directional solidification and hot isostatic pressing process eliminates internal shrinkage cavities and looseness. According to the process, the impurity content in the iridium ingot is remarkably reduced, and the purity and compactness of the material are improved.

The invention discloses a comprehensive utilization method of bamboos, and belongs to the technical field of comprehensive utilization of bamboo products. According to the silicon content difference of different parts of the bamboos, the raw bamboos are separated into the bamboo green layers and the bamboo flesh for graded utilization, the bamboo green layers are used for producing high-added-value products, the bamboo flesh is used for pulping and papermaking, and efficient comprehensive utilization of the low-carbon high-silicon bamboos is achieved. Graded utilization is achieved based on natural differences of silicon contents of all parts of bamboo wood, the silicon content of a bamboo green layer is far higher than that of bamboo pulp, the bamboo green layer is rich in active ingredients, 62% or above of silicon in pulping bamboo chips can be removed from the source after stripping, the silicon content of pulping black liquor is reduced by 53% or above, and the pulping quality is improved. The core problems of equipment scaling, alkali recovery rate reduction and the like caused by silicon in the papermaking process are thoroughly solved, meanwhile, high-added-value products such as bamboo-based composite materials and functional drinks can be specifically prepared through the bamboo green layer, and bamboo meat meets the pulping and papermaking requirements due to rich fibers and low silicon content; and finally, high-value comprehensive utilization with low carbon, environmental protection and high economic benefit of the bamboo wood is achieved.

A high-silicon copper-containing calcine leaching residue resource utilization method, comprising: mixing high-silicon copper-containing calcine leaching residue with solid strong alkali, roasting at 140-160 DEG C, obtaining roasting alkali residue; the roasting alkali residue is added with calcium oxide and water to carry out concentrated alkali leaching, solid-liquid separation, obtaining alkali leaching residue and alkali leaching liquid; the alkali leaching liquid is added with a sulfidation agent to precipitate copper, obtaining copper precipitation residue and copper precipitation liquid; the copper precipitation liquid is added with calcium oxide to remove silicon, obtaining silicon precipitation residue and silicon removal liquid; copper is enriched in the copper precipitation residue; the "low-temperature roasting + concentrated alkali leaching" process of the application can effectively destroy the stable structure of high-silicon copper-containing calcine leaching residue, so that the copper wrapped by silicon is exposed, the chemical reaction of the high-silicon copper-containing calcine leaching residue leaching process is significantly strengthened, and the copper leaching rate can be greatly improved; the roasting temperature of the application is only 140-160 DEG C, which is much lower than the general alkali roasting temperature, the energy consumption is lower, the possible high-temperature injury is reduced, and the safety is higher.

This invention belongs to the field of lepidolite tailings technology, and particularly relates to a process for reducing the silicon content in feldspar based on lepidolite tailings. Specifically, it includes the following steps: pretreatment of lepidolite tailings; preparation of soluble starch cross-linked microspheres; preparation of quartz inhibitors; preparation of dicarboxylic acid anionic polyacrylamide; preparation of feldspar inhibitors; addition of quartz inhibitors under neutral conditions to float feldspar; and addition of feldspar inhibitors under alkaline conditions to float quartz. By adding quartz inhibitors to the slurry under neutral conditions, the soluble starch cross-linked microspheres can hinder the adsorption of anionic collectors on the quartz surface, thereby effectively inhibiting quartz and reducing the silicon content in the floated feldspar. By adding feldspar inhibitors to the slurry under alkaline conditions, pectin and dicarboxylic acid anionic polyacrylamide can hinder the effect of anionic collectors on feldspar, thereby effectively inhibiting feldspar and further reducing the silicon content in the feldspar.

The invention provides a method and a system for recycling electrolytic nickel anolyte, and relates to the field of hydrometallurgy recycling. According to the method for recycling the electrolytic nickel anolyte, nickel ions are separated from silicon and hydrogen ions in the electrolytic nickel anolyte through the acid retardant resin containing the amino active group, nickel acid separation is achieved, the silicon content in the solution is reduced, the purity of the solution is improved, and consumption of a subsequent silicon removal reagent is reduced; afterwards, the liquid after adsorption is subjected to a first reverse osmosis process, and a first reverse osmosis concentrated phase, namely, nickel cathode liquid, is obtained. Due to the reduction of the silicon content in the liquid after adsorption, the formation of a silicon membrane which is difficult to clean on the reverse osmosis membrane is inhibited, the membrane flux of the reverse osmosis membrane is improved, and the use of a membrane cleaning agent is reduced. Therefore, through the acid retardant resin process and the first reverse osmosis membrane process in the embodiment of the invention, the nickel cathode liquor with higher purity is obtained, the use of a silicon removal reagent and a membrane cleaning agent is effectively reduced, and the economical efficiency is good.

This application provides a silicon-carbon anode material, its preparation method, an anode sheet, and a battery. The silicon-carbon anode material includes a silicon-carbon matrix and a carbon coating layer covering at least a portion of the surface of the silicon-carbon matrix. The silicon-carbon matrix comprises porous carbon and silicon particles filling the pores of the porous carbon. In the silicon-carbon matrix, the mass percentage of the silicon particles increases radially from the inside out; and the average particle size of the silicon particles decreases radially from the inside out. This application can obtain a silicon-carbon anode material with both excellent electrochemical performance and low expansion rate.

The invention relates to a pole piece and a cylindrical lithium ion battery. The pole piece comprises a current collector and active substance layers positioned on two sides of the current collector; in the length direction of the pole piece, the content of at least one active substance in the active substance layer is gradually reduced from the roll head to the roll tail of the pole piece. The expansion difference of the inner and outer ring pole pieces is improved and the battery performance is improved by regulating and controlling the formulas of the upper and lower slurry layers and the coating thickness in the length direction.