10results about How to "Reduce alkali consumption" patented technology

The invention discloses a method for comprehensively recovering valuable elements from waste acid, the waste acid contains copper, nickel and arsenic, the concentration of copper in the waste acid is 25g / l-70g / l, the concentration of arsenic in the waste acid is 5g / l-50g / l, the concentration of nickel in the waste acid is 2g / l-25g / l, and the concentration of acid in the waste acid is 70g / l-220g / l, and the method comprises the steps of evaporative crystallization, membrane dialysis, primary neutralization and secondary neutralization. According to the method, the copper recovery rate is not lower than 98%, the nickel recovery rate is not lower than 90%, and the arsenic recovery rate is not lower than 80%. According to the invention, neutralization is carried out after evaporative crystallization and membrane dialysis, so that the alkali consumption can be reduced by 40-60%, and the treatment cost is reduced.

The invention discloses a method for preparing a tungsten compound from artificial tungsten ore, which comprises the following steps: reacting sulfuric acid with the artificial tungsten ore to leach tungsten, and controlling the reaction conditions that the pH is 0.2-4.0, the temperature is 25-100 DEG C, the reaction time is 30 minutes to 6 hours, and the liquid-solid ratio is 1: 1-10: 1. And obtaining a metatungstate leaching solution after the reaction is completed, so that efficient leaching of tungsten is realized. And further performing purification and impurity removal on the solution to obtain a pure metatungstate solution. The pure metatungstate solution can be used for preparing different pure tungsten compound products such as solid metatungstate, phosphotungstic acid, ammonium phosphotungstate, tungsten oxide, ammonium metatungstate, ammonium paratungstate and tungstic acid. According to the technology, efficient leaching of tungsten under the mild condition can be achieved, high acid and high alkali are not needed in the whole process, and energy consumption and emission are greatly reduced; the obtained leachate is easy to purify to obtain a pure metatungstic acid solution, and the pure metatungstic acid solution can be directly used as a platform intermediate to flexibly prepare various tungsten chemicals.

The invention discloses a method for analyzing the content of solid-phase iron in metatitanic acid, and belongs to the technical field of titanium dioxide production. The analysis method comprises the following steps: taking metatitanic acid slurry before bleaching, dissolving the metatitanic acid slurry with a sulfuric acid-ammonium sulfate mixed solution to obtain a prepared sample, and determining the total iron content by adopting a phenanthroline colorimetric method; taking the same amount of slurry, filtering, repeatedly washing the filter cake with 5% dilute sulphuric acid until no soluble iron residue exists, collecting the filtrate, fixing the volume to obtain a to-be-detected solution, and determining the content of the soluble iron by adopting the phenanthroline colorimetric method; and calculating the solid-phase iron content according to the difference value between the total iron content and the soluble iron content. According to the analysis method disclosed by the invention, accurate quantification of the solid-phase iron content in metatitanic acid is realized, the defect that only total iron can be measured in an existing method is overcome, a scientific basis is provided for the sulfuric acid addition amount of a sulfuric acid method titanium dioxide bleaching process, the production cost is reduced, and the quality of a titanium dioxide product is also improved.

The invention relates to the technical field of gallium extraction, in particular to a method for extracting gallium from gallium-containing substances, which comprises the following steps: S1, adding a glycine-sodium citrate composite coordination agent into the gallium-containing materials to selectively leach out gallium, and adjusting the pH value to 8.8-9.2; s2, performing electrochemical deposition on a three-dimensional porous titanium-based PbO2 anode and a stainless steel cathode, and reducing the heavy metal into a metal elementary substance in situ by utilizing the characteristic that the reduction potential of Pb < 2 + > and Cd < 2 + > is higher than that of Ga < 3 + >, so that the concentration of the metal elementary substance is reduced to 1t; 0.1 mg / L; s3, gallium ions are specifically recognized through a Ga-IIP adsorption column, and a high-purity desorption solution is obtained through dilute sulphuric acid desorption; and S4, metal gallium is obtained through electrolytic deposition, and liquid obtained after electrolysis flows back to S1 to be recycled. Through the synergistic effect of selective complexing of the coordination agent, electrochemical in-situ heavy metal removal, ion imprinting specific adsorption and electrolyte closed-loop circulation, alkali consumption is reduced, the gallium recovery rate is high, the product purity is high, no heavy metal dangerous waste residues are generated, and the method is suitable for various gallium-containing materials such as bauxite mother liquor, lead-zinc smelting slag and coal ash.

The application discloses a method for recovering tungsten from waste SCR denitration catalyst acid leaching residue, which comprises the following steps: (1) using a mixed solution of sulfide and alkali to leach the waste SCR denitration catalyst acid leaching residue, and obtaining WO4 2‑ / WO x S 4‑x 2‑ solution and a titanium-rich residue after solid-liquid separation; (2) introducing ozone into the WO4 2‑ / WO x S 4‑x 2‑ solution obtained in step (1) to perform oxidation treatment, obtaining a WO4 2‑ solution, and recovering tungsten from the WO4 2‑ solution. The application uses sodium sulfide coupled with sodium hydroxide as the leaching agent, and using sodium sulfide as the leaching agent can not only reduce the alkali consumption of alkali leaching, but also has higher leaching efficiency, so that the efficient utilization of tungsten elements in the waste SCR denitration catalyst acid leaching residue is realized. The application uses ozone oxidation to transform the tungsten into sodium tungstate, and then performs subsequent impurity removal process, which is beneficial to improving the tungsten recovery rate.

This invention provides a process for the recycling and treatment of high-salinity wastewater, relating to the field of wastewater treatment technology. The process includes: Step 1: Analyzing the organic composition of various high-salinity wastewaters to determine the composition and content of materials; Step 2: Developing corresponding treatment plans for the specific components of each high-salinity wastewater; Step 3: Treating the high-salinity wastewater according to the treatment plan, and adjusting and optimizing the plan to remove organic matter and reduce the color of the high-salinity wastewater; Step 4: Evaporating the treated wastewater to precipitate salt, preparing qualified by-product salt or by-product sodium sulfite. Compared to traditional methods of removing organic matter from wastewater such as Fenton oxidation and biochemical processes, this invention is cleaner, more environmentally friendly, and more effective, significantly reducing the treatment cost of high-salinity wastewater.

The invention relates to the technical field of nitrobenzene alkali washing, in particular to a static mixer and a nitrobenzene liquid alkali washing method. The static mixer comprises an outer shell, a mixing cavity is formed in the outer shell, a first liquid inlet is formed in the head end of the outer shell, and a mixed liquid outlet is formed in the tail end of the outer shell; the conveying pipe penetrates through the mixing cavity from the head end of the outer shell and extends to the tail end of the outer shell, a first port of the conveying pipe extends out of the outer shell and forms a second liquid inlet, a second port of the conveying pipe is closed, the part, located in the mixing cavity, of the conveying pipe forms a spraying section, and a plurality of spraying holes distributed at intervals are formed in the pipe wall of the spraying section; a first spiral blade and a second spiral blade which are distributed at intervals in the axial direction of the spraying section are arranged on the periphery of the spraying section, and the spiral directions of the first spiral blade and the second spiral blade are opposite. According to the static mixer, acid liquor in nitrobenzene liquid can be effectively contacted with alkali liquor, so that the use amount of the alkali liquor is reduced, the alkali consumption is reduced, and the alkali washing effect is improved.

The present application relates to ramie degumming process technical field, specifically is a kind of acid-base synergic biological enzyme assisted ramie green degumming method, the method uses NaOH-H2SO4 Synergic treatment system, by acid dipping-alkali dipping two-step method synergistic effect, acid dipping stage is treated with 1%-5% H2SO4 Solution adding surfactant etc., alkali boiling stage is treated with 2%-6% NaOH solution adding sodium silicate etc., combined with biological enzyme auxiliary treatment, realize efficient degumming, the present application acid-base synergic biological enzyme assisted ramie green degumming method, gum removal rate is >90%, reduce 20%-30% alkali dosage, fiber breaking strength is increased by 20%-25%, wettability is significantly improved, residual glue rate is as low as 2% or less, and reduce production cost and wastewater treatment cost, adapt to existing production line, can satisfy high-end textile demand.

This application provides a method for upgrading bauxite after grinding with mother liquor, belonging to the field of mineral processing. The method includes: grinding a mixed slurry of bauxite to be upgraded and circulating mother liquor to obtain an alkaline slurry with fully liberated aluminum and gangue minerals; using the circulating mother liquor as both a separation and auxiliary medium throughout the process, performing mineral processing and upgrading on the alkaline slurry to separate iron and silicon impurities in the circulating mother liquor medium, obtaining a concentrate slurry and a tailings slurry; sending the concentrate slurry to an alumina leaching process; and separating the tailings slurry to obtain circulating mother liquor and tailings byproducts. This application, through systematic process reengineering and closed-loop media design, successfully develops a bauxite pretreatment method that can be deeply coupled and seamlessly integrated with the Bayer process main process, avoiding interference from external media, and achieving efficient impurity removal under fully liberated mineral conditions.

The application provides a supercapacitor carbon and a preparation method thereof. The preparation method comprises the following steps: firstly, mixing petroleum coke and pitch uniformly to obtain a first material; then, carbonizing the first material under the condition of an oxygen-containing gas to obtain a second material; then, crushing the second material and mixing the second material with alkali to perform primary activation under an inert atmosphere to obtain a third material; then, washing and drying the third material, mixing the third material with pitch and alkali, and performing secondary activation under an inert atmosphere; finally, washing and drying to obtain the supercapacitor carbon. The supercapacitor carbon has mesopore-micropore two-stage pore channels, wherein the mesopore has a pore diameter of 2nm-5nm, and the micropore has a pore diameter of 0.4nm-2nm. The application realizes the short-range through-hole pore channel structure design of the petroleum-based porous material through a combined process, provides a large specific surface area for the formation of an effective double electric layer, guarantees the rapid transmission of electric charges, and significantly improves the long-period cycle stability of the material.