32results about How to "Reduce the liquid-solid ratio" patented technology

The invention discloses a method for preparing cobalt phosphate by separating cobalt lithium from lithium cobalt oxide in waste lithium batteries. The method comprises the following steps: 1) dismantling and stripping waste lithium batteries to obtain positive and negative active materials; 2) Calcining and grinding the positive and negative active materials to obtain a LiCoO2-containing powder material; 3) The LiCoO2-containing powder material is leached with a mixed leaching solution of H3PO4 and H2O2, and the obtained leaching solution is neutralized and solid-liquid separated , to obtain cobalt phosphate precipitate and lithium-containing solution. This method uses lithium cobalt oxide of typical waste lithium batteries as raw material, adopts roasting combined with leaching to effectively separate Co and Li, and recovers its high value-added cobalt to prepare cobalt phosphate (cobalt violet), realizing the recycling of lithium cobalt oxide in waste lithium batteries and exploit.

The invention discloses a method, system and control method for high-efficiency pressure filtration and leaching polluted soil. The method for repairing heavy metal-contaminated soil comprises the following steps: S1, pulping, acidifying reaction; S2, filtering the above-mentioned fully reacted slurry to obtain soil filter cake and filtrate; S3, pre-washing, so that the filter cake The remaining heavy metals in the capillary pores are replaced and washed out; S4, after the pre-washing, inject the eluent step by step into the washing reaction type diaphragm filter press to perform a multi-stage leaching reaction; S5, after the rinsing reaction, the Stabilize the free heavy metals remaining in the soil filter cake, and at the same time make the tiny heavy metal particles formed during the stabilization process migrate out of the soil, the input pressure is 0.22‑0.35 MPa, and the amount of sulfide leaching water is 50‑80 of the total water content in the soil %; S6, stabilized soil. The invention solves the problem in the prior art that the leaching solution remains in the soil during the leaching process and the index of toxic heavy metals leached from the soil exceeds the standard.

A method for comprehensively recovering valuable metals in waste lithium ion battery black powder: the waste lithium ion battery black powder is subjected to high temperature reduction in an inert atmosphere, and then hydrogen chloride gas is introduced for selective hydrochlorination to obtain solid products and volatilization. The volatile chloride salt fume and dust are subjected to water leaching to obtain filtrate and solid residue, and the solid product is subjected to water leaching and solid-liquid separation to obtain water leaching liquid and water leaching residue; the water leaching residue is subjected to magnetic separation to obtain Magnetic nickel-cobalt alloy and non-magnetic mixture, the non-magnetic mixture is leached with NaOH solution to obtain aluminum leaching solution and high-purity regenerated graphite; the filtrate and water leaching solution are combined, the pH is adjusted to 9-12, and the solid-liquid separation is performed to obtain manganese hydroxide solid and Lithium ion-containing filtrate, adding saturated Na to the lithium ion-containing filtrate 2 CO 3 solution, solid-liquid separation, and hot water washing of the filter residue to obtain high-purity Li 2 CO 3 . The whole recovery process of the invention is simple, the loss of valuable metals is small, and the recovery efficiency is high.

The invention provides a phosphorite decomposition method which comprises the following steps: S1, leaching out phosphorite by using a mixed solution of phosphoric acid and a solutizer so as to obtain a lixivium and leaching residues; and S2, extracting the lixivium by using sulfuric acid, thereby obtaining ardealite and a phosphoric acid solution. As the phosphorite is decomposed by using the mixed solution of the phosphoric acid and the solutizer, not only are the decomposition ate of phosphorite and the recycling rate of phosphorus increased, but also the amount of the mixed solution for leaching out the phosphorite is reduced, that is, the phosphorus recycling rate is increased on premise that a liquid-solid ratio is reduced. Correspondingly, the amount of the mixed solution is reduced, the liquid-solid ratio of gypsum to extraction residue pulp after the extraction step is reduced, furthermore the treatment amount of the pulp is reduced, and the production efficiency is improved.

A process for preparing high-purity ammonium paramolybdate from ammonium polymolybdate as raw material includes adding purified water and ammonia water, heating while stirring, stirring under a certain steam pressure for evaporation crystallizing while boiling the solution, concentrating, solid-liquid separation, and baking. Its advantages are high purity and high crystallizing rate (94.5-96%.

The invention discloses a myrciaria cauliflora leaf-based handmade soap and a preparation method thereof. The preparation method comprises the following steps: mixing a transparent soap base and rosehydrolat, heating in a water batch for dissolving, then adding four types of base oils, namely sweet almond oil, wheat germ oil, jojoba oil and olive oil respectively, as moisturizing agents, and thenadding a myrciaria cauliflora leaf extract concentrate and a semiaquilegia adoxoides extract concentrate, dripping in citronella essential oil and mint essential oil, uniformly stirring, moulding, standing, ventilating and drying to obtain the myrciaria cauliflora leaf-based handmade soap. The handmade soap prepared by the preparation method provided by the invention, is light brown, semitransparent, natural, safe, mild, smooth and rich in aroma, contains myrciaria cauliflora leaf fragrance, rose fragrance, citronella fragrance and mint fragrance, is a multifunctional handmade soap with antioxidant, antibacterial, itching-relieving, mosquito-repellent effects and the like.

The invention relates to a novel method for liquefying a plant biomass and waste polyester mixed supercritical fluid, which comprises the following steps of placing plant biomass, polyester, a catalyst and a liquefying agent into a reaction kettle with a stirrer, raising the temperature of the reaction kettle to 230-280 DEG C, pressurizing to 5-8MPa, preserving the temperature under the state for5-40min, introducing cooling water when being naturally cooled to 100 DEG C after the liquefying is finished to cool the reaction kettle to room temperature; filtering reactant mixture in the reaction kettle by using a Buchner funnel; extracting obtained filtrate and residue by using an organic solvent; and distilling obtained extract liquor and extract by using a rotary evaporator, wherein the product remained in a distillation flask after the distillation is the biomass liquefied oil. The invention develops a new way of utilizing the plant biomass and the waste polyester, realizes the moderation of the liquefying condition of the plant biomass, improves the quality of the biological oil because of the molecular weight of the biological oil is lower, and improves the utilization efficiency of the plant biomass and the waste polyester.

The invention relates to a method utilizing titanium white waste acid to prepare electrolytic manganese metal, belonging to the field of metallurgical chemistry. The technical problem that the invention aims at solving is to provide the method with lower production cost for utilizing the titanium white waste acid to prepare the electrolytic manganese metal. The steps of the method are as follows:a. leaching: manganese ore containing manganese dioxide, pyrite ore and the titanium white waste acid are reacted in a reaction container after being heated to the temperature of 90 to 100 DEG C, water in proper quantity is added to make up for the evaporated quantity of water in the reaction process, CaCO3 is added when the pH value of solution is within 1.5 to 2 so as to neutralize the pH valueof the solution to 4.8 to 5.2, and then ammonia water is added to adjust the pH value to 6.2 to 6.4; b. filtering: a reaction product of step a is filtered to obtain filtering solution and filtering residues; c. purifying and removing of heavy metal: sulfide salt is added to the filtering solution obtained in step b so as to remove the heavy metal, and the filtering solution is simply filtered and then filtered in a fine manner after being stewed for 24 to 48 hours so as to obtain the filtering solution that meets the electrolytic requirement; d. electrolyzing: the manganese metal and waste electrolytic solution namely anode solution containing sulfuric acid are obtained.