19results about "Lithium sulfates/sulfites" patented technology

A method for producing battery-grade lithium dihydrogen phosphate using lithium-containing brine includes the following steps: (1) adding sodium hydroxide solution to lithium-containing mother liquor, adding the mixed solution to sodium dihydrogen phosphate solution, maintaining the pH of the system at 9-11, reacting, separating the solid and liquid phases to obtain lithium phosphate precipitate and mother liquor; (2) adjusting the slurry, adding concentrated sulfuric acid to react, separating the solid and liquid phases to obtain a mixed solution of liquid-phase lithium dihydrogen phosphate and lithium sulfate; (3) vacuum cooling and crystallization separation to obtain lithium dihydrogen phosphate crystals. This invention achieves efficient recovery of lithium ions from low-concentration lithium-containing brine, eliminating the need for conventional processes such as electrodialysis and MVR for further concentration of lithium-containing mother liquor. It also avoids the use of phosphoric acid in the acidification process, saving raw material costs, reducing the amount of water added in the acidification process, and reducing energy consumption in the crystallization separation process. The resulting battery-grade lithium dihydrogen phosphate is of stable quality, uniformly distributed, and bright white in color, suitable for preparing lithium-ion battery cathode materials, and has a low cost.

A process (100) for treating aqueous impurity containing streams containing lithium cations and impurities within a lithium extraction process comprises: (a) contacting the impurity containing stream with a soluble phosphate to produce a precipitate containing lithium phosphate and a soluble impurity containing stream; and (b) treating the precipitate containing lithium phosphate with an aqueous reagent to produce the soluble phosphate for re-use in step (a) and a lithium salt recyclable to the lithium extraction process (100). Lithium recovery from the impurity containing stream may be 80% or greater.

Provided is a method for purifying a lithium sulfate solution, comprising the steps of: leaching a lithium-containing ore with sulfuric acid to obtain a lithium sulfate solution mixed with a leach residue; adding an alkaline supplementary material to the lithium sulfate solution mixed with the leach residue to form a magnesium precipitate; and removing the magnesium precipitate and the leach residue by solid-liquid separation, wherein the step of forming the magnesium precipitate is performed at a pH higher than the isoelectric point of the magnesium precipitate and lower than the isoelectric point of the leach residue.

The utility model relates to a kind of lithium salt separation and concentration device, including the filter assembly, ultrafiltration membrane assembly, nanofiltration separation system and reverse osmosis separation system connected in turn;Nanofiltration separation system includes three-stage nanofiltration membrane separation unit, and three-stage nanofiltration membrane separation unit is connected in turn in sequence.By adopting filter assembly and ultrafiltration membrane assembly combination as the pretreatment of raw material liquid, it is small, and degree of automation is high.Nanofiltration separation system has the function of selective retention to different salt or solute, by selecting different membrane through three-stage nanofiltration membrane separation unit, to control the water production ratio of permeate and concentrated solution, can effectively improve the concentration of lithium ion in raw water, so that its concentration can reach the requirement of making battery and other devices.At the same time, it saves cost.

The present invention provides an optimized method for recovering high-purity lithium sulfate from a lithium-containing composite oxide deposited on an eroded surface of a waste sagger discarded. Therefore, when the method for producing high-purity lithium sulfate from a waste sagger of the present invention is used, it is expected not only to be able to produce high-purity lithium sulfate that can be used for manufacturing lithium secondary batteries by recycling a discarded waste sagger, but also to be able to recycle a positive electrode active material, iron oxide, alumina, silicate, and calcium carbonate obtained as by-products during the production process of the lithium sulfate.

The application provides two kinds of non-gas composite lithium supplement agents I and II, the lithium supplement agent I and the lithium supplement agent II are all composed of three phases, the first phase is Li m RO n is a lithium-rich oxide, and the third phase is a carbon coating layer; in the lithium supplement agent I, the second phase is Li2Z, and in the lithium supplement agent II, the second phase is W p Z. The lithium supplement agent I has two delithiation platforms, which are located at about 4.40V and about 4.60V respectively; the lithium supplement agent II has two delithiation platforms, which are located at about 3.80V and about 4.45V respectively. The two kinds of lithium supplement agents have similar compositions, but the applicable scenarios and mechanisms are not the same. The preparation and application steps of the application are simple and easy to operate, which are not only safe and pollution-free, but also have small equipment and post-processing costs, and are suitable for large-scale amplification and can be quickly put into use.

The application provides a method and system for purifying lithium salt products by using waste battery by-products. The method comprises the following steps: 1) after the waste battery is subjected to crushing and pyrolysis treatment, first separation treatment is performed to obtain mixed waste gas containing hydrogen fluoride, solid-phase waste material containing silicon, and positive electrode solid-phase waste material; 2) the mixed waste gas is introduced into a first mixed system containing a silicon-containing system, and after first reaction in a subcritical state, second separation treatment is performed to obtain a mixed solution containing fluorosilicic acid and a reduction system; and 3) a mixed system containing the mixed solution and a lithium-containing system is subjected to second reaction, and after third separation treatment, lithium salt is obtained; wherein the pH of the mixed system is 5-10. The method provided by the application can simultaneously realize efficient fixation of fluorine and purification of lithium salt products, and has the advantages of simple process flow, environmental friendliness and economic efficiency.

The application provides a method for extracting lithium from waste batteries, which comprises the following steps: (1) pretreatment: obtaining waste ternary positive materials, and pretreating the waste ternary positive materials to obtain black powder; (2) reduction roasting treatment: roasting the black powder to obtain roasted powder; (3) acid dissolution treatment: performing acid dissolution reaction of the roasted powder and a sulfuric acid solution to obtain a solid-liquid mixture; (4) first electrolysis treatment: performing first electrolysis on the solid-liquid mixture, and after the first electrolysis is completed, filtering to obtain first filter residue and a first lithium-containing solution; (5) purification treatment: performing purification treatment on the first lithium-containing solution to obtain purified Li2SO4. By using the method provided by the application, the recovery rate of lithium is increased to more than 98%, and the purity of Li2SO4 is increased to more than 99%.

The application discloses a method for resource utilization of a ternary lithium ion battery positive electrode material, and comprises the following steps: (1) performing a hydrothermal displacement reaction on positive electrode material powder from a waste ternary lithium ion battery in the presence of a displacing agent and water, obtaining a Li-rich solution and a solid containing Ni elements, Co elements and Mn elements through solid-liquid separation; + (2) performing post-treatment on the Li-rich solution to obtain a Li-containing product; + (3) performing a hydrothermal reaction on the solid containing Ni elements, Co elements and Mn elements after acidic reduction to obtain an acid leaching solution, and optionally, (4) recycling the acid leaching solution for preparation of a positive electrode material. The resource utilization method has the advantages of simple process, high selectivity, applicable technology, economic feasibility and the like.

The recovery method provided in the application comprises the following steps: heat treatment of the positive electrode powder and a reducing agent, reduction of nickel, cobalt and manganese in the positive electrode powder, and separation of nickel, cobalt, manganese and lithium in the positive electrode powder by water washing. The obtained solid filter material mainly comprises nickel, cobalt and manganese metals and oxides, and further comprises a small amount of Li2CO3. Then, the solid filter material is dissolved and electrolyzed by using sulfuric acid. Compared with a traditional process, the recovery method provided in the application greatly reduces the consumption of sulfuric acid, and the treatment process is simple and the economic benefit of recovery is high.

The present invention provides a method for efficiently preparing, in an environmentally friendly manner, high-purity lithium fluorosulfonate from raw materials that are easy to handle without concern for exposure to harmful substances.

This invention discloses a method and system for preparing concentrated sulfuric acid from dilute sulfuric acid, belonging to the field of concentrated sulfuric acid preparation technology. The method includes: dilute sulfuric acid A is flash-evaporated via flash evaporation A to obtain dilute sulfuric acid B; dilute sulfuric acid B is then flash-evaporated in flash evaporation B to obtain dilute sulfuric acid E; dilute sulfuric acid E is then flash-evaporated in flash evaporation C to obtain concentrated sulfuric acid F; wherein, the steam generated from flash evaporation A and flash evaporation B is mixed and then compressed and heated in booster compressor A; the temperature of the first saturated steam after compression is increased and then returned to flash evaporation A and flash evaporation B for heating; the saturated condensate generated during heating preheats dilute sulfuric acid A, and the preheated dilute sulfuric acid A is then returned to flash evaporation A; the steam generated from flash evaporation C is compressed and heated in booster compressor B; the temperature of the second saturated steam after compression is increased and then returned to flash evaporation C for heating. This invention can realize the recovery of low-concentration dilute sulfuric acid to prepare high-concentration sulfuric acid, significantly reducing the cost of dilute sulfuric acid concentration.

A dry thermal reaction-based method for producing lithium sulfate from black mass or black powder and converting same into lithium hydroxide, according to one embodiment of the present invention, can produce lithium sulfate and convert same into lithium hydroxide through water leaching and a dry thermal reaction, which uses a sulfate additive. In addition, unlike a conventional secondary battery waste resource recycling process, strong acid and alkaline solutions are not used, and thus environmental pollutants such as waste liquid and waste slurry are not generated, thereby significantly reducing environmental treatment costs. Additionally, lithium recovery efficiency is high due to the high solubility of lithium sulfate (about 27 times that of lithium carbonate). Further, a resource circulation process such as reusing metal sulfate residues, which are process by-products, as a sulfate additive without additional post-treatment, recycling process water (ultrapure water) and recycling generated dust can be implemented.

Processes for treating an aqueous composition comprising lithium sulfate and sulfuric acid. The processes comprise evaporatively crystallizing the aqueous composition comprising lithium sulfate and sulfuric acid under conditions to obtain crystals of lithium sulfate monohydrate and a lithium sulfate-reduced solution; and optionally separating the crystals of the lithium sulfate monohydrate from the lithium sulfate-reduced solution. The processes optionally further comprise concentrating the lithium sulfate-reduced solution under conditions to obtain an acidic condensate and a concentrate comprising sulfuric acid.

This utility model discloses a high-efficiency lithium sulfate solution calcium removal reactor, relating to the field of lithium sulfate processing technology. It includes a reaction chamber with a lithium sulfate solution inlet and a calcium removal agent inlet mounted on its upper surface. An agitator shaft is installed inside the reaction chamber. Vertical rods are mounted above horizontal bars, and agitator blades are mounted on the agitator shaft. First scrapers are mounted on the outer sides of the horizontal bars, and second scrapers are mounted below the horizontal bars. A discharge pipe is installed at the bottom of the reaction chamber, and a conveying auger is fixedly connected to the agitator shaft. A water storage tank is installed on the left side of the reaction chamber. When cleaning the reaction chamber is required, a circulating water pump draws water from the water storage tank through a pumping pipe, and the water is sprayed through a cleaning nozzle on the discharge pipe to simply rinse the agitator blades. The agitator blades stir the cleaning solution in the reaction chamber, and together with the first and second scrapers, the interior of the reaction chamber is cleaned.

The application provides a method for extracting lithium from waste batteries, which comprises the following steps: (1) pretreatment: obtaining waste ternary positive materials, and pretreating the waste ternary positive materials to obtain black powder; (2) reduction roasting treatment: roasting the black powder to obtain roasted powder; (3) acid dissolution treatment: performing acid dissolution reaction of the roasted powder and a sulfuric acid solution to obtain a solid-liquid mixture; the molar ratio of Li element in the roasted powder to H element in the sulfuric acid solution is 1:(0.98-1.3); (4) electrolysis treatment: performing electrolysis of the solid-liquid mixture, and after electrolysis, filtering to obtain filter residue and a lithium-containing solution. By using the method provided by the application, the recovery rate of lithium is increased to more than 98%.

This application relates to a positive electrode active material and its preparation method, and a battery, belonging to the field of battery technology; the positive electrode active material has a core-shell structure, the core of the core-shell structure includes a lithium-rich manganese-based active material, and the shell layer of the core-shell structure includes Li2SO4, Li2SeO4, and Li2Se. x S 1‑x At least two of the following O4, wherein 0 < x < 1, are obtained by coating Li2SO4, Li2SeO4 and Li2Se with a lithium-rich manganese-based active material. x S 1‑x At least two of the shells formed in O4, utilizing Li2SO4, Li2SeO4, and Li2Se x S 1‑x O4 and other materials have high ionic conductivity, which can effectively promote the transport of lithium ions at the interface of lithium-rich manganese-based active materials, giving the positive electrode active material a high ion diffusion coefficient.

The present disclosure relates to integrated systems and processes to produce lithium products, including battery grade lithium carbonate and lithium hydroxide.

Systems and methods for obtaining lithium-containing materials from liquid streams are generally described. In some instances, aqueous streams are treated with a lithium selective agent prior to and / or following electrolysis of the stream to produce basic species such as hydroxide ions. In some cases, the lithium selective agent is a solids-forming agent such as a precipitant (e.g., phosphoric acid / phosphate) or a solid sorbent (e.g., aluminum hydroxide). The electrogenerated basic species may induce carbon dioxide capture to form carbonate and / or bicarbonate anions. Coupling of the electrolytic processes and / or carbon dioxide capture processes to the lithium selective separation processes may promote efficient generation of value-added lithium-containing materials such as lithium hydroxide and / or lithium carbonate. Some embodiments involve the electrolytic and / or thermal regeneration of the lithium selective agent, and / or the recycling of electrogenerated acidic species, which can also contribute to an efficient, cost-effective system for obtaining lithium-containing materials.