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.

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.

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 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.