191results about "Lithium sulfates/sulfites" patented technology

The invention relates to a clean production process of plateau sulfate type boron-lithium salt lake brine. The process comprises the following steps of: (1) arranging a pre-airing pond, a mirabilite pond, a NaCl pond, a carnallite pond, an epsom salt pond I, a magnesium removing pond, an epsom salt pond II, a boron pond, a lithium pond and an old brine pond; (2) controlling the sodium ion concentration in plateau sulfate type boron-lithium salt lake brine, precipitating mirabilite out in winter to obtain brine A, naturally evaporating the brine A, and salting out to obtain brine B; (3) naturally evaporating the brine B, and precipitating sylvine and carnallite out in sequence to obtain brine C; (4) naturally evaporating the brine C, precipitating an epsom salt out, and performing solid-liquid separation to obtain brine D and a solid A; (5) blending the brine D with mirabilite, removing magnesium to obtain brine E, and naturally evaporating brine E to obtain brine F and a solid B; (6) performing a hydration reaction on brine F, naturally evaporating, and precipitating reservoir water/inderite and brine G out; and (7) evaporating brine G or refrigerating for precipitating lithium sulfate, and processing the lithium sulfate into a corresponding product. The process has the advantages of comprehensive utilization of natural energy, saving in energy and environment friendliness.

In the production process of lithium hydroxide monohydrate, lithium sulfate solution and caustic soda are made to produce metathetic reaction to form mixture solution of sodium sulfate and lithium hydroxide, and sodium sulfate and lithium hydroxide monohydrate are then separated by means of the obvious difference in low temperature solubility. The production process includes the following steps: adding sodium hydroxide into lithium sulfate solution obtained through serial production steps to obtain mixture solution of sodium sulfate and lithium hydroxide; cooling to minus 10 deg.c to 5 deg.c for the crystallization and separation of sodium sulfate; heating to concentrate the separated clear liquid; crystallization and separation to obtain coarse lithium hydroxide monohydrate product; water dissolving coarse lithium hydroxide monohydrate, adding barium hydroxide to form insoluble barium sulfate, filtering, concentrating filtrate, crystallizing to separate wet lithium hydroxide monohydrate; and drying.

Methods for scrubbing gas streams to remove acid gases including sulfur dioxide, mercury-containing substances, and/or nitrogen oxides from the gas stream. The gas stream is contacted with a potassium-based sorbent effective for removing at least a portion of the acid gases. The partially cleaned gas stream is then contacted with an oxidant effective to remove at least a portion of the nitrogen oxides and/or mercury-containing substances after partially removing the acid gas substance.

A method for preparing nickel/manganese/lithium/cobalt sulfate and tricobalt tetraoxide from battery wastes adopts the following process: dissolving battery wastes with acid, removing iron and aluminum, removing calcium, magnesium and copper, carrying extraction separation, and carrying out evaporative crystallization to prepare nickel sulfate, manganese sulfate, lithium sulfate, cobalt sulfate or/and tricobalt tetraoxide. By using the method, multiple metal elements, such as nickel, manganese, lithium and cobalt, can be simultaneously recovered from the battery wastes, the recovered products are high in purity and can reach battery grade, battery-grade tricobalt tetraoxide can also be directly produced. The method is simple in process, low in, energy consumption and free in exhaust gas pollution, and can realize zero release of wastewater.

A cathode active material for a lithium secondary cell used in a cellular phone is disclosed. The cathode active material for the lithium secondary cell and the method the same having a high capacity and a long lifetime, different from LiCoO₂ and LiMn₂O₄, Li(Ni, Co)O₂, and V-system oxide that has been researched as the active material for substituting LiCoO₂ are provided. The cathode active material for the lithium secondary cell in the next formula 1 is obtained by heating or chemically treating diadochite [Fe₂(PO₄)(SO₄)(OH).6H₂O] that is the mineral containing PO₄³⁻, SO₄²⁻, and OH⁻.

Li_aFe_bM_c(PO₄)_x(SO₄)_y(OH)_z  (1)

In the formula, M is at least one element selected from a radical consisting of Mg, Ti, Cr, Mn, Co, Ni, Cu, Zn, Al, and Si, with 0≦a, c≦0.5, 1≦b≦2, 0.5≦x, y, z≦1.5.

A novel integrated process for the recovery of sulphate of potash (SOP) from sulphate rich bittern is disclosed. The process requires only bittern and lime as raw materials. Kainite type mixed salt is obtained by fractional crystallization of the bittern, Kainite is converted to schoenite with simultaneous removal of NaCl by processing it with water and end liquor obtained from reaction of schoenite with MOP for its conversion to SOP. The end liquor from kainite to schoenite conversion (SEL) is used for the recovery of MOP. SEL is desulphated and supplemented with MgCl₂ using end bittern generated in the process of making carnallite. The carnallite is decomposed to get crude potash which in turn processed to get MOP. The carnallite decomposed liquor produced in the decomposition of carnallite is reacted with hydrated lime for preparing CaCl₂ solution and high purity Mg(OH)₂ having low boron content, The CaCl₂ solution is used for desulphatation of SEL producing high purity gypsum as a byproduct. It is shown that the liquid steams containing potash are recycled in the process, the recovery of potash in the form of SOP is quantitative.

The present invention relates to a catalyst for reducing mercury, which comprises a reagent comprising any of the sulfites of potassium, sodium, calcium and magnesium, or any of the phosphates thereof, or a combination of them, as a main reagent of a catalyst component. And the present invention relates to the catalyst for reducing mercury, wherein the catalyst component is mixed with a different salt as an agent for inhibiting crystallization of the catalyst component.

The invention discloses a roasting system and a roasting method for lithium-ore acidification by using an externally-heated type rotary furnace, which comprises the following steps of: generating acidifying grog through acidifying roasting after mixing beta lithium ores and sulfuric acid by using the externally-heated type rotary furnace as the core equipment of acidifying roasting reaction, and sending the acidifying grog which is generated after acidifying roasting into a subsequent working procedure after cooling the acidifying grog, wherein the sulfuric acid for acidifying roasting is used after the concentration of an acid liquor after tail gas is washed is adjusted through fuming sulfuric acid and can also be directly prepared from concentrated sulfuric acid or fuming acid or by mixing the two acids; the tail gas which is generated in the process of acidifying roasting is discharged with reaching standards after acid washing and alkali washing, and most of the acidic gas in the tail gas returns to the roasting system along with the washing acid to be reutilized during acid washing. The invention overcomes the defects of large tail-gas quantity, serious pollution and the like of a traditional internally-heated type acidifying-roasting process and provides a good method for the extraction of metallic lithium in the lithium ores, the self-heating of the reaction is fully utilized, energy does not need to be additionally consumed after the self reaction temperature is reached, and the energy-saving effect is remarkable.

The present invention provides a process for recovering Li values from a sodium saturated brine. The process includes recovering Li values from a sodium saturated brine which contains LiX. The process includes concentrating the sodium saturated brine to at least 9000 mg/l LiX, passing the concentrated brine through a bed of polycrystalline hydrated alumina pellets until the pellets are loaded with LiX from the concentrated brine, displacing brine held-up in the bed by using concentrated NaX, unloading LiX from the pellets by flowing through the bed an aqueous solution of LiX which is not saturated, displacing the LiX from the bed using concentrated NaX, and repeating the steps at least one additional time to provide the Li values.

Methods of processing an aqueous solution comprising potassium sulfate and magnesium sulfate include crystallizing K₂SO₄, crystallizing recycle crystals, and mixing at least a portion of the recycle crystals with the aqueous solution. Systems for processing potassium sulfate and magnesium sulfate include a first crystallizer and a second crystallizer in fluid communication with the second mix tank. The second crystallizer is structured and adapted to precipitate recycle crystals from the concentrated liquor to form a potassium-depleted recycle brine. The recycle crystals precipitated in the second crystallizer have a composition suitable to be recycled to the first crystallizer to increase the production of SOP.

The present invention provides a lithium ion battery and positive electrode material thereof. The positive electrode material includes a high nickel material having a chemical formula of LiNi_xM_1-xO₂ and a coating layer, wherein 0.5≤X<1, M is selected from at least one of Co, Mn, Al, Mg, Ti and Zr, a specific surface area of the positive electrode material is 0.2 to 0.6 m²/g, and a residual lithium content on a surface of the positive electrode material is 200 to 1000 ppm. Compared with the prior art, the positive electrode material for lithium ion battery of the present invention is prepared by solid phase reaction, which not only can significantly reduce the residual lithium content on the surface of the positive electrode material, but also can avoid increase of the specific surface area of the positive electrode material for lithium ion battery.

A method of purifying lithium sulfide wherein lithium sulfide obtained by reacting lithium hydroxide with hydrogen sulfide in an aprotic organic solvent is washed with an organic solvent at a temperature of 100° C. or higher. Impurities contained in lithium sulfide can be reduced by the method of purification.

A method of making an alkali metal salt is described and involves (1) reacting at least one alkali metal formate with an least one acid to form an alkali metal salt in the presence of formate ions and (2) substantially removing the formate ions from the alkali metal salt formed in step (1).

The invention provides a method for extracting lithium from amblygonite and preparing iron-containing phosphate. The method comprises the following steps of (1) treating the amblygonite to dissolve out the lithium, so as to obtain a dissolved solution; (2) separating solid and liquid of the dissolved solution in step (1), so as to obtain a lithium-containing solution and an aluminum phosphate-containing precipitate; (3) extracting the aluminum phosphate-containing precipitate in step (2) by an acid solution, adding an iron source into the extracted solution, adding an alkaline matter to regulate the pH (potential of hydrogen) value, and separating solid and liquid, so as to obtain the iron-containing phosphate. The method has the advantages that the operation is simple, the process is short, the cost is low, and the extracting rate of lithium element can reach 93% or above; the purity of the lithium-containing product is high, and the purity of ferric phosphate and/or ferrous phosphatecan reach 95% by mass or above; the prepared ferric phosphate and/or ferrous phosphate can be used for further synthesizing the lithium iron phosphate.

The present disclosure relates to a lithium sulfur battery, and the battery includes a cathode and an anode arranged facing each other; a separator interposed between the cathode and the anode; and an electrolyte, and further includes at least one or more membranes of a lithium ion conductive polymer membrane positioned between the cathode and the separator and having a sulfonic acid group (—SO₃H), and a metal oxide membrane positioned between the anode and the separator, and therefore, an electrode active material loss is reduced, an improved lifespan characteristic is obtained by blocking the spread of lithium polysulfide to the anode, and in addition thereto, enhanced safety is obtained by suppressing a dendrite growth in the anode.

The invention belongs to the technical field of lithium iron phosphate waste liquid recovery and provides a method for preparing high-purity lithium sulfate from waste liquid recovered from hydrothermal method based lithium iron phosphate production. The method includes: 1) boiling waste liquid generated in a hydrothermal method based lithium iron phosphate production process, and adding sodium hydroxide to adjust pH; 2) adding hydrogen peroxide, adding an adsorbent after reaction, and filtering after reaction; 3) subjecting filtrate to evaporation concentration, centrifugal separation and drying to obtain high-purity anhydrous lithium sulfate; 4) stirring and washing filter residues with dilute sulfuric acid, and filtering to use as an adsorbent for cyclic adsorption. By hydrogen peroxide, residual organics in waste liquid is oxidized and decomposed or converted into easily-adsorbable organics, and the adsorbent is used for adsorption to remove the organics; after oxidization, adsorption and decontamination, solution is crystallized to obtain high-purity lithium sulfate, and the filter residues subjected to dilute sulfuric acid washing, stirring and filtering serve as the adsorbent for cyclic adsorption. Purity of the high-purity lithium sulfate prepared according to the method reaches 99.90%.

Aluminum polychlorosulphates having the general formula (I)whereM represents an alkali metall, m, n, p represent the number of moles per mole of aluminum, so that1.74<=l<=2.25,0.01<=n<=0.17,0.32<=p<=1.49, andl+m+2n=p+3,their use as coagulation and flocculation agents, and their preparation process by reaction, at room temperature, of an alkali metal basic compound, such as Na2CO3, NaHCO3, NaOH, K2CO3, KHCO3 and KOH, and an alkali metal sulphate or sulphuric acid with an aluminum polychloride or polychlorosulphate having the general formula(I')where1.1<=1'<=1.44,n'<=0.10,p'<p(p of formula (I)), andl'+m'+2n'=p'+3.