125results about "Rare earth metal chlorides" patented technology

The invention provides a method for recovering rare earth, aluminum and silicon from rare earth-containing aluminum and silicon wastes. The method comprises the following steps: 1, carrying out acid dipping on the rare earth-containing aluminum and silicon wastes by using an aqueous inorganic acid solution to obtain silicon-rich residues and an acid dipping solution containing rare earth ions and aluminum ions; 2, adding an alkaline substance to the acid dipping solution containing rare earth ions and aluminum ions to control the pH value of the acid dipping solution to be 3.5-5.2, and carrying out solid-liquid separation to obtain an aluminum hydroxide-containing precipitate and a rare earth-containing filtrate; and 3, reacting the aluminum hydroxide-containing precipitate with sodium hydroxide to obtain a sodium metaaluminate solution and aluminum and silicon residues, and using the rare earth-containing filtrate to prepare a rare earth compound product. Aluminum and rare earth are dissolved in the acid, segmented alkaline transfer is carried out, the aluminum ions are precipitated to obtain aluminum hydroxide and the rare earth ions which are separated from the aluminum hydroxide, and excess sodium hydroxide is added to convert aluminum hydroxide into the sodium metaaluminate solution, so simultaneous and high-efficiency recycling of the rare earth and aluminum is realized, the use amount of sodium hydroxide is greatly reduced, and the recovery cost is reduced.

A method of producing metal chlorides is disclosed in which chlorine gas is introduced into liquid Cd. CdCl₂ salt is floating on the liquid Cd and as more liquid CdCl₂ is formed it separates from the liquid Cd metal and dissolves in the salt. The salt with the CdCl₂ dissolved therein contacts a metal which reacts with CdCl₂ to form a metal chloride, forming a mixture of metal chloride and CdCl₂. After separation of bulk Cd from the salt, by gravitational means, the metal chloride is obtained by distillation which removes CdCl₂ and any Cd dissolved in the metal chloride.

The invention provides a preparation method of anhydrous cesium chloride. The preparation method is characterized in that cerium oxide is taken as a raw material, reaction is conducted by using ammonium chloride solid, then dried hydrogen chloride gas enters, heating is conducted until the reaction is completed, and products are dried to obtain anhydrous cesium chloride. By the combined use of theammonium chloride and the hydrogen chloride gas, and by the combination and the proportioning of the using amount of reactants, the synergistic effect of the ammonium chloride and the hydrogen chloride is achieved to adjust the position relationship of each reactant, to make the reaction more complete, the yield of the reaction product is high, drying is conducted under an inert atmosphere by reducing pressure to prevent the occurrence of redox side reaction, improve the product purity, and the preparation method is safe and effective, and the products are pure.

The invention relates to a method for low-calcium high-grade mixed type rare-earth concentrate circulating slurrying decomposition, and belongs to the field of hydrometallurgy. The method comprises the following steps that an absolute excess low-concentration sulfuric acid solution is adopted, fluorine-carbon cerium ore in a low-calcium high-grade mixed concentrate is rapidly decomposed by a slurrying reaction under the heating condition; and after the reaction, acid leaching slag is soaked in water to dissolve calcium sulfate and rare earth sulfate into water immersion liquid, and impuritiesare removed in the water immersion liquid to form phosphorus-iron-thorium slag. After the acid leaching liquid supplements sulfuric acid, new ore is recycled, and the concentrated alkali liquor is used for decomposing water leaching slag and the phosphorus-iron-thorium slag. The alkali wastewater is crystallized and recycled, and the sodium phosphate is recycled. The method is suitable for low-calcium high-grade mixed type rare-earth concentrate treatment, fluorine and phosphorus resources in the mixed rare-earth concentrate can be recycled, sulfuric acid, sodium hydroxide, energy consumptionand the like are reduced to the theoretical consumption, the problems that the concentrated sulfuric acid and the rare-earth concentrate are subjected to solid-solid-solid-phase reaction equipment crusting and the like are solved, and industrialization is easy to realize.

The invention provides a method for preparing anhydrous rare earth chloride through a gas phase method. According to the method, hydrogen chloride gas is directly used to chlorinate a rare earth oxide serving as a raw material to prepare anhydrous rare earth chloride. The method comprises the following steps: putting the rare earth oxide in a chlorination furnace and heating to 350-650 DEG C; introducing hydrogen chloride gas into the chlorination furnace to chlorinate the rare earth oxide; holding the temperature for 20-35h then stopping, thus obtaining the chlorinated anhydrous rare earth chloride; in the chlorination process, absorbing the hydrogen chloride tail gas (discharged by the chlorination furnace) by a lime solution through an acid mist absorption device and emptying the hydrogen chloride tail gas. When used for preparing anhydrous rare earth chloride, the method is capable of inhibiting generation of chlorinated rare earth oxides; and the purity of the prepared anhydrous rare earth chloride product is higher than 98.00% and the yield of rear earth is higher than 99.5%.

A method for the separation of the rare-earth fission product poisons comprising providing a spent nuclear fuel. The spent nuclear fuel comprises UO₂ and rare-earth oxides, preferably Sm, Gd, Nd, Eu oxides, with other elements depending on the fuel composition. Preferably, the provided nuclear fuel is a powder, preferably formed by crushing the nuclear fuel or using one or more oxidation-reduction cycles. A compound comprising Th or Zr, preferably metal, is provided. The provided nuclear fuel is mixed with the Th or Zr, thereby creating a mixture. The mixture is then heated to a temperature sufficient to reduce the UO₂ in the nuclear fuel, preferably to at least to 850° C. for Th and up to 600° C. for Zr. Rare-earth metals are then extracted to form the heated mixture thereby producing a treated nuclear fuel. The treated nuclear fuel comprises the provided nuclear fuel having a significant reduction in rare-earths.

The invention provides a preparation method for an anhydrous rare-earth chloride (REC13). The preparation method comprises the following steps: S1) utilizing hydrochloric acid to dissolve a rare earthoxide, thereby forming a rare-earth chloride solution; S2) adding ammonium chloride into the dissolved rare-earth chloride solution; S3) stir-frying under a heating condition, thereby acquiring a solid mixture of rare-earth chloride containing crystal water and ammonium chloride; S4) transferring the stir-fried solid mixture into a sublimation device, rising temperature to 390 DEG C from 80 DEG Cin the manner of gradient temperature rise, and meanwhile, vacuumizing and heating, and removing ammonium chloride and crystal water of the rare-earth chloride in turn in the vacuumizing and heatingprocess, thereby acquiring the high-purity anhydrous rare-earth chloride. The method provided by the invention has the characteristics of simple and safe production process, no side reaction, high purity of prepared anhydrous rare-earth chloride and being beneficial to large-scale production.

A method is described to produce high purity rare earth oxides of the elements La, Ce, Tb, Eu and Y from phosphor, such as waste phosphor powders originating in various consumer products. One approach involves leaching the powder in two stages and converting to two groups of relatively high purity mixed rare earth oxides. The first group containing Eu and Y is initially separated by solvent extraction. Once separated, Eu is purified using Zn reduction with custom apparatus. Y is purified by running another solvent extraction process using tricaprylmethylammonium chloride. Ce is separated from the second group of oxides, containing La, Ce and Tb by using solvent extraction. Subsequently, La and Tb are separated from each other and converted to pure oxides by using solvent extraction processes. A one-stage leaching process, wherein all rare earths get leached into the solution and subsequently processed, is also described.

The invention relates to a method for preparing aluminum oxide through hydrochloric acid leaching and two-stage electrolysis of bauxite and comprehensively utilizing aluminum oxide. The method comprises the following steps: carrying out hydrochloric acid leaching, solid-liquid separation and purification on bauxite on bauxite, so as to obtain an iron chloride mixed solution and an aluminum chloride mixed solution; respectively separating and purifying the iron chloride mixed solution and the aluminum chloride mixed solution, so as to obtain scandium chloride, gallium chloride, an aluminum chloride water solution and an iron chloride water solution; setting electrolytic voltage and current density, and respectively carrying out two-stage electrolysis on the aluminum chloride water solution and the iron chloride water solution, so as to respectively obtain aluminum hydroxide, hydrogen and chlorine as well as iron hydroxide, hydrogen and chlorine; preparing a hydrochloric acid solution by using the generated hydrogen and chlorine, and returning the hydrochloric acid solution to a leaching stage for recycling; and roasting aluminum hydroxide, so as to obtain metallurgy level aluminum oxide or chemical aluminum oxide. Compared with a traditional acid method, the electrolysis method for recycling aluminum oxide in the bauxite and processing the bauxite has the advantages that the evaporation step and equipment, the concentration step and equipment are omitted, the operation is simplified, meanwhile, the cost is substantially lowered, and the product has relatively high purity.

The invention relates to filtration equipment, in particular to rare earth chloride solution movable filtration equipment for producing rare earth chloride carbonate. Therefore, the technical problemis to provide the rare earth chloride solution movable filtration equipment for producing rare earth chloride carbonate which can continuously stir the rare earth chloride solution in a process of filtering a rare earth solution, enables impurities in the rare earth chloride carbonate to be difficultly deposited and cannot block a filtration device. The rare earth chloride solution movable filtration equipment for producing the rare earth chloride carbonate comprises a mounting frame, a collection frame, a first mounting rod, a second mounting rod, a guide rail, guide sleeves, a movable screening frame, a screening mesh, a first pull rod, a stirring box, a first bearing base and the like; and the collection frame is mounted in the middle of the bottom part of the mounting frame. Accordingto the rare earth chloride solution movable filtration equipment for producing the rare earth chloride carbonate disclosed by the invention, the effects that the rare earth chloride solution can be continuously stirred in the process of filtering the rare earth solution, the impurities in the rare earth chloride solution are difficultly to deposit and the filtration device cannot be blocked are achieved.

The invention provides a preparation method of rare earth halide. The method comprises the following steps: heating LnX3.nNH4X powder in a rare earth oxide crucible to obtain rare earth halide LnX3, wherein the rare earth element in the LnX3.nNH4X powder is the same as the rare earth element in the rare earth oxide crucible, Ln is selected from La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, Sc and Y, X is halogen, and n is more than 0 and less than or equal to 12. According to the preparation method provided by the invention, the high-purity, anhydrous and oxygen-free rare earth halide can be obtained; and the anhydrous high-purity rare earth halide obtained by the method can be used for growing high-purity blocky single crystals or fibrous single crystals with excellent scintillation performance.

The invention provides a preparation method of anhydrous rare earth chloride (REC13). The method comprises the steps of S1, dissolving a rare earth oxide with hydrochloric acid to form a rare earth chloride solution; S2, adding ammonium chloride into the dissolved rare earth chloride solution; S3, parching the mixture until the mixture is thoroughly dried under a heating condition to obtain a solid mixture of the rare earth chloride containing crystal water and the ammonium chloride; S4, transferring the parched solid mixture into a sublimation device, raising the temperature from 80 DEG C to390 DEG C in a gradient heating mode, and simultaneously carrying out vacuuming heating operation, wherein in the vacuuming heating process, the crystal water of the ammonium chloride and the rare earth chloride are sequentially removed, so that the high-purity anhydrous rare earth chloride is obtained. The method has the advantages that the production process is simple and safe, no side reactionhappens, the purity of the prepared anhydrous rare earth chloride is high, and large-scale production is facilitated.

The invention provides a process method for smelting and separating uranium, thorium and rare earth from monazite concentrate. The process method comprises the following steps that the monazite concentrate is used as a raw material, the steps of crushing by wet ball mill and iron removal by magnetic separation, alkali decomposition transformation, preparation of trisodium phosphate product, alkalicake adding hydrochloric acid for solubilization, preparation of rare earth chloride mixture product, adding hydrochloric acid to optimal solution slag for full dissolution, extraction of uranium byamines and preparation of uranium products, extraction of thorium by acidic phosphorus containing compounds and preparation of crude thorium products and wastewater treatment are adopted, and the recovery rate of valuable resources such as uranium, thorium, rare earth is greater than 95%. After the thorium is extracted, the raffinate water phase is returned to the optimal solution to recover the rare earth chloride mixture, most of the production process water is directly returned and recycled, and a small part of wastewater is returned to the system for utilization after comprehensive treatment, so that zero discharge of the wastewater is realized. The process is reliable, the chemical materials are common, and the consumption is low. The use of solitary stone resources is ensured for green, environmental protection, efficient and clean production, and the process method has obvious social benefits and economic benefits.

The invention provides a preparation method of anhydrous yttrium chloride. The preparation method includes the steps that yttrium oxide is used as a raw material to react with solid ammonium chloride,then dry hydrogen chloride gas is introduced, heating is performed until the reaction is complete, and a product is fluidized, dried, baked and dewatered to obtain anhydrous yttrium chloride. Throughcombined use of ammonium chloride and hydrogen chloride gas and combination with the proportion amount of the reactants, a synergistic effect of ammonium chloride and hydrogen chloride is achieved; the positional relationship of all the reactants is adjusted, so that the reaction is more complete, and the yield of the reaction product is high; fluidized drying and baking are sequentially performed, so that the occurrence of redox side reactions is prevented, the product purity is improved, the production method is safe and effective, and the product is pure.

The invention discloses a preparation method of anhydrous lanthanum chloride. The preparation method comprises the following steps: S1, carrying out first-section fluidization dehydration on lanthanum chloride heptahydrate at 60 DEG C to 100 DEG C to obtain a lanthanum chloride trihydrate crude product; S2, carrying out second-section fluidization dehydration on the lanthanum chloride trihydrate crude product at 120 DEG C to 130 DEG C to obtain a lanthanum chloride monohydrate crude product; S3, carrying out third-section fluidization dehydration on the lanthanum chloride monohydrate crude product at 140 DEG C to 160 DEG C to obtain the anhydrous lanthanum chloride, wherein the three sections of fluidization dehydration are carried out in a hydrogen chloride gas atmosphere. According to the preparation method of the anhydrous lanthanum chloride, disclosed by the invention, the lanthanum chloride heptahydrate is subjected to sectioned fluidization dehydration and a hydrogen chloride protection gas atmosphere is provided, so that a hydrolysis effect in a process of dehydrating an intermediate product lanthanum chloride monohydrate into the anhydrous lanthanum chloride is effectively inhibited and the purity of a product is greatly improved; the preparation method of the anhydrous lanthanum chloride has the advantages of low dehydration temperature, low preparation cost and good dehydration effect.

The invention relates to the technical field of preparation of rare earth materials, in particular to a preparation method of high-purity anhydrous rare earth chloride. The preparation method comprises the following steps: (1) mixing rare earth oxide and ammonium chloride, and carrying out heating for a reaction to obtain a mixture A; (2) mixing the mixture A with hydrochloric acid to obtain a solution B; (3) concentrating and drying the solution B to obtain a solid C; and (4) carrying out programmed heating on the solid C to obtain the product. The method has the advantages of high yield, high purity and low water content.

The invention discloses a preparation method of high-purity anhydrous rare earth chloride, which comprises the following steps: heating and dehydrating high-purity water-containing rare earth carbonate under micro negative pressure to obtain a raw material anhydrous rare earth carbonate; putting the crude anhydrous rare earth carbonate obtained in the previous step into a rotary atmosphere furnace for micro-negative pressure suction, and gradually raising the temperature step by step; after the technical requirements are met, slowly opening an anhydrous hydrogen chloride storage tank, and giving a flow rate according to the technical requirements, so that anhydrous rare earth carbonate is subjected to chlorination reaction under pure anhydrous hydrogen chloride; introducing anhydrous hydrogen chloride gas of which the theoretical amount is 105-130%, controlling the reaction rate to be 1kg-20kg/h ventilation, and cooling to room temperature under the protection of nitrogen after the ventilation is finished; sucking the reacted product into a storage container for inspection under the protection of dry nitrogen by using a vacuum suction machine, and collecting the finished anhydrous rare earth chloride under the condition of isolating water and oxygen. The method is low in process cost, simple in process control, environment-friendly, safe and easy for industrial production.

A process for producing at least one rare earth chloride from an ore containing the at least one rare earth comprises: contacting the ore containing the at least one rare earth with reactants comprising a carbonaceous reducing agent, chlorine, and a boron-containing Lewis acid in a chlorination reactor to produce a gaseous product and a non-volatile chloride mixture comprising the at least one rare earth chloride.

The invention discloses a preparation method for an anhydrous rare earth chloride. The method comprises the following steps: step 1, performing first-stage fluidization dehydration on a rare earth chloride heptahydrate under the temperature of 60 DEG C-100 DEG C to obtain a crude product of a rare earth chloride trihydrate; step 2, performing second-stage fluidization dehydration on the crude product of the rare earth chloride trihydrate under the temperature of 120 DEG C-130 DEG C to obtain a crude product of a rare earth chloride monohydrate; and step 3, performing third-stage fluidization dehydration on the crude product of the rare earth chloride monohydrate under the temperature of 140 DEG C-160 DEG C to obtain the anhydrous rare earth chloride, wherein the third-stage fluidization dehydration is carried out in a hydrogen chloride gas atmosphere. According to the preparation method for the anhydrous rare earth chloride provided by the invention, the rare earth chloride heptahydrate is subjected to staged fluidization dehydration, and the hydrogen chloride protection gas atmosphere is provided, so that hydrolysis in the process of dehydration of the intermediate product rare earth chloride monohydrate to the anhydrous rare earth chloride is effectively inhibited, and the product purity is greatly improved; and the preparation method for the anhydrous rare earth chloride hasthe advantages of a low dehydration temperature, low preparation costs and good dehydration effects.