45 results about "Scandium chloride" patented technology

Water tolerant Lewis acids are used in a process for the preparation of alkylene glycols by catalytic hydration of the corresponding alkylene oxide. The water tolerant Lewis acids can be a metal salt of a non-coordinating or weakly coordinating anion and a Group IIIB, rare earth or lanthanide, actinide or Group IVB cation. Optionally, carbon oxide may also be present. Examples of such water tolerant Lewis acids are scandium triflate, europium triflate, hafnium triflate, yttrium triflate, lanthanum triflate and ytterbium triflate. The catalyst may contain a coordinating anion instead, examples of which are scandium sulfate [Sc2(SO4)3], scandium chloride [ScCl3], scandium acetate [Sc(OAc)3] and scandium nitrate [Sc(NO3)3]. The catalysts may also contain both a non-coordinating or weakly coordinating anion and a coordinating anion, examples of which are scandium triflate sulfate [Sc(CF3SO3) (SO4)], scandium triflate chloride [Sc(CF3SO3)2Cl], scandium triflate acetate [Sc(CF3SO3)2(OAc)] and scandium triflate nitrate [Sc(CF3SO3)2(NO3)].

A process for producing an aluminium-scandium based alloy from aluminium and scandium chloride, the process also producing aluminium chloride as a by-product and including the step of reducing scandium chloride in the presence of aluminium in a reaction zone and under reaction conditions which favour production of the aluminium-scandium based alloy.

The production process of quaternary carbonate powder includes the following steps: firstly, making scandium oxide and hydrochloric acid produce reaction to produce scandium chloride, then making thescandium chloride, barium nitrate, strontium nitrate, calcium nitrate and sodium carbonate produce coprecipitation reaction to obtain quaternary carbonate, then making the obtained quaternary carbonate undergo the processes of centrifugal filtering, washing, drying and sieving to obtain the invented finished product. Said product can be coated on the cathode, its transmitted current density can be raised by aboev once as compared with cathode coated with ternary carbonate.

A method for chlorinating and electrolyzing bauxite to prepare alumina and comprehensively utilizing bauxite comprises the following steps: chlorinating and separating chlorite to respectively obtain anhydrous aluminum chloride, anhydrous ferric chloride, silicon tetrachloride, titanium tetrachloride, scandium chloride and gallium chloride; converting the anhydrous aluminum chloride and the anhydrous ferric chloride into an aqueous aluminum chloride solution and an aqueous ferric chloride solution; electrolyzing the corresponding aqueous solutions at a controlled voltage and a controlled current density for a controlled electrolysis time to obtain aluminum hydroxide, ferric hydroxide, hydrogen and chlorine; returning the chlorine to the above chlorination section; calcining the aluminum hydroxide to obtain metallurgical grade / chemical grade alumina; calcining the ferric hydroxide to obtain iron red or other iron-containing products; rectifying and purifying the silicon tetrachloride to generate polysilicon and zinc chloride; refining the titanium tetrachloride to form a sponge titanium raw material; and enriching the scandium chloride in chloride residues to obtain a scandium extraction raw material. The method has the advantages of low cost, cheap and easily available raw materials, simple operating process, high automation degree, high product purity, and realization of recycling of zinc, chlorine and other raw materials.

A process for producing an aluminum-scandium based alloy from aluminum and scandium chloride, the process also producing aluminum chloride as a by-product and including the step of reducing scandium chloride in the presence of aluminum in a reaction zone and under reaction conditions which favor production of the aluminum-scandium based alloy.

A method for preparing metal aluminum through bauxite pelletizing, chlorination and electrolysis and comprehensively utilizing bauxite comprises the following steps that the bauxite, a carbon source and a kaolin ingredient are fetched according to a ratio and evenly mixed, so that a mixed material is obtained, and a binder and water are added to the mixed material, wherein the mass of the binder accounts for 1.0%-2.0% of the total mass of the mixed material, and the mass of the water accounts for 2.0%-5.0% of the total mass of the mixed material; even mixing is conducted, pelletizing and air drying are conducted; chlorination and separation are conducted on the pellets, so that anhydrous aluminum chloride, anhydrous ferric chloride, silicon tetrachloride, titanium tetrachloride, scandium chloride and gallium chloride are obtained; the anhydrous aluminum chloride is directly electrolyzed, so that metal aluminum and chlorine are obtained; the chlorine returns to the chlorination stage; the silicon tetrachloride is further purified; the titanium tetrachloride is refined to be used as a raw material of titanium sponge; and the scandium chloride is enriched in chlorination residues to be used as a scandium extraction raw material. According to the method, the cost is low, the raw materials are low in price and easy to obtain, through pelletizing chlorination, a chlorination reaction is complete, the operation process is easy, the automation degree of electrolysis is high, the prepared metal aluminum has high purity, and chlorine, zinc and other raw materials can be circularly utilized.

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 discloses a preparation method and application of ultra-high-purity scandium oxide. The preparation method includes: acid-dissolving crude scandium oxide or scandium chloride; quenching and tempering with strong acid, and purifying by extracting agent and / or leaching resin after quenching and tempering; and obtaining ultra-high-purity scandium oxide by precipitation after purification. The invention can not only realize the removal of rare earth impurity elements and common trace elements in scandium oxide, but also realize the deep removal of difficult-to-remove trace uranium and thorium elements and trace impurities of zirconium and titanium in scandium oxide; and the operation process of the invention is simple and has strong performance. Practical, no organic, weak base or strong base stripping is involved, no scandium loss will be caused, and the initial equipment investment cost and energy consumption can be reduced.

The invention belongs to the technical field of preparation of nanometer materials and in particular relates to controllable synthesis of scandium fluoride nanoparticles of three crystalline phases and crystalline phase control. The method comprises the following steps: taking anhydrous scandium chloride and ammonium fluoride as raw materials, taking oleate as a reaction solvent, and reacting at different temperatures for a certain time so as to obtain the scandium fluoride nanoparticles of different crystalline phases; and cleaning the reaction product with ethanol, performing centrifugal precipitation to obtain a purified sample, dispersing the sample in cyclohexane, and preserving for later use. In the preparation process, the scandium fluorides of three different crystalline phases can be obtained by changing the reaction temperatures only, and conversion from a tetragonal phase to an orthogonal phase or a cubic phase and conversion from the orthogonal phase to the cubic phase can be realized under the low-temperature normal-pressure conditions. According to the method disclosed by the invention, the scandium fluorides of three crystalline phases are prepared by thermal co-precipitation, mutual conversion of the crystalline phases under the low-temperature normal-pressure conditions can be realized, the method is simple in operation process and post-treatment, short in reaction period, low in cost, non-toxic and pollution-free, and fundamental research of a scandium nanometer material is greatly perfected.

The invention belongs to the field of low-temperature electrochemical extraction and particularly relates to a method for preparing an aluminum-based rare earth alloy through near-room-temperature electrolysis. The method for preparing the aluminum-based rare earth alloy through near-room-temperature electrolysis is an electrolytic method, and a electrolyte adopted by the electrolytic method is formed by rare earth chloride and ionic liquid, wherein the ionic liquid accounts for 96-98% of the total mass of the electrolyte, the rare earth chloride accounts for 2-4% of the total mass, and the rare earth chloride is one of neodymium chloride, lanthanum chloride, cerium chloride, scandium chloride, yttrium chloride, praseodymium chloride, samarium chloride, europium chloride, gadolinium chloride and terbium chloride. According to the technological for preparing the aluminum-based rare earth alloy through near-room-temperature electrolysis, operation is easy, and cost is low; and the technological reserve and theoretical support are provided for green extraction of the low-cost aluminum-based rare earth alloy.