11results about "Antimonates/antimonites" patented technology

The present application relates to the field of nonferrous metallurgy, and provides a method for preparing high-quality sodium pyroantimonate by ultrasonic strengthening, comprising the following steps: preparing a mixed solution with the concentration of sodium hydroxide being 200-400 g / L and the concentration of an additive being 10-40 g / L; the additive is potassium hydroxide and / or glycerol; adding antimony oxide into the mixed solution at a proportion of 150-250 kg / m 3 , and heating and performing ultrasonic treatment to obtain a mixed slurry; adding hydrogen peroxide into the mixed slurry, continuing to react for 10-120 min after the hydrogen peroxide is completely added, then performing liquid-solid separation to obtain a solid product; drying the solid product after washing to obtain a sodium pyroantimonate product. The essence of the present application is that the oxidation diffusion process is strengthened by using ultrasonic waves and an additive, and the high-quality sodium pyroantimonate product is prepared by the combined action. The sodium pyroantimonate product prepared by the method has the advantages of good quality, low consumption of oxidizing agent, stable technical indexes, etc.

This invention discloses a composite modified lithium manganese oxide cathode material, its preparation method, and its applications, belonging to the field of cathode material technology. The structural formula of the composite modified lithium manganese oxide cathode material is: LiX a O b @LiYO2 / LiMn2O4, comprising: a core composed of LiYO2 and LiMn2O4, and LiX coating at least a portion of the surface of the core. a O b The coating layer; wherein: LiMn2O4 has a porous structure, and LiYO2 fills the channels of LiMn2O4. The cathode material in this invention uses lithium manganese oxide as a matrix, with LiYO2 filling the channels of the matrix, and LiX coated on the surface of the matrix. a O b Filling the pores with LiYO2 can reduce the Jahn-Teller effect of lithium manganese oxide without affecting the specific capacity of the cathode material. Moreover, LiYO2 can accelerate the lithium-ion diffusion rate, thereby improving the rate performance of the material.

The utility model discloses a sodium antimonate preparation device and a screening mechanism thereof. The sodium antimonate preparation device comprises a reaction kettle, a sodium hydroxide storage tank, a powder conveying mechanism, a hydrogen peroxide storage tank, a soft water storage tank, a centrifugal machine, a filtrate storage tank, a drying machine and a stockpiling warehouse, the powder conveying mechanism, the sodium hydroxide storage tank, the hydrogen peroxide storage tank and the soft water storage tank are used for supplying raw materials into the reaction kettle; the raw materials are conveyed to the centrifugal machine after reaction in the reaction kettle; liquid separated by the centrifugal machine is output to a filtrate storage tank, and formed solid is output to a drying machine and dried by the drying machine; an evaporator is arranged in the filtrate storage tank, and the filtrate is output to the reaction kettle after being heated, evaporated and concentrated by the evaporator. The raw materials in the filtrate are used again for reaction, so that the utilization rate of the raw materials is improved. And by arranging the screening mechanism, unqualified sodium antimonate is removed. And packaging the qualified sodium antimonate for sale.

The invention discloses a method for deeply removing arsenic from sodium antimonate. The method comprises the following steps: retaining a low-arsenic sodium antimonate filter cake obtained by arsenic removal treatment through a leaching-oxidation precipitation method in situ in a filter press; a composite reagent solution is introduced into the closed filter press, soaking and reaction are carried out on the low-arsenic sodium antimonate filter cake, liquid obtained after sulfuration and alkali washing is discharged, a wet sodium antimonate product is obtained, and the composite reagent solution is a mixed solution containing a sulfuration reagent and NaOH; the wet sodium antimonate product is circularly washed with water and dried, and a sodium antimonate product is obtained; in the sodium antimonate product, the content of arsenic is not more than 0.001%. According to the method, the purpose of deeply removing arsenic from the sodium antimonate material with low arsenic content (As2O3lt; 0.05%) is achieved by optimizing the process parameters such as the proportion, the concentration and the temperature of a deep washing reagent.

This invention relates to the field of inorganic fine chemical material preparation technology, and discloses a method for purifying electronic-grade sodium metaantimonate with low impurity content. The method includes: dissolving antimony trioxide in sodium hydroxide solution and cooling to a first reaction temperature after impurity removal; adding sodium gluconate to construct a coordination metastable system containing a pentavalent antimony precursor; atomizing and dropping hydrogen peroxide to complete the oxidation reaction while maintaining the homogeneous system without precipitation; heating to a second reaction temperature to dissociate the coordination system and induce controlled crystal precipitation; and obtaining the product after separation, washing, and drying. This invention completely decouples the oxidation reaction and crystallization process on the time axis through chemical means, and achieves lattice-level deep self-purification by using a thermally induced dissociation mechanism while suppressing explosive nucleation. The obtained sodium metaantimonate has extremely high purity and a regular cubic crystal morphology.

The application discloses a method for removing copper from sodium antimonate at low temperature and at high speed, and the method comprises the following steps: under the conditions of negative pressure, microwave heating and stirring, removing copper from sodium antimonate, a water solvent and a composite copper removal reagent; after the reaction is completed, solid-liquid separation is performed; the obtained liquid part is a reaction mother liquor, and the obtained solid part is copper-removed sodium antimonate; and the copper removal substance in the composite copper removal reagent is an ammonium source substance. The method has the advantages of low reaction temperature, short reaction time, fast reaction speed, energy saving and environmental protection, good copper removal effect, high product yield, and the like. The obtained sodium antimonate product can meet the requirements of various glass fining agents and decoloring agents; the method reduces the requirement for copper in raw materials in the preparation of sodium antimonate, expands the source of the sodium antimonate raw material, reduces the cost of the raw material, and thus reduces the production cost of the sodium antimonate product.

The invention relates to the technical field of inorganic chemical synthesis, and discloses a preparation method of particle-size-controllable high-end flame-retardant sodium pyroantimonate, which comprises the following steps: completely dissolving antimony trioxide in a sodium hydroxide solution, and carrying out hot filtration to construct a homogeneous metastable state precursor without solid phase residue; excessive oxidant and seed crystal are preset in the base solution, and an oxidant-rich bearing phase is established; reverse continuous feeding of a precursor into an undertaking phase is strictly controlled, the injection rate of antimonite ions and the surface area of a seed crystal are dynamically matched in real time under the condition that excessive strong oxidation potential energy of a peroxidant is maintained in the whole process, and the reaction is carried out in a dynamic metastable region for inhibiting secondary nucleation until feeding is finished; according to the preparation method disclosed by the invention, a homogeneous precursor is constructed and reverse lean solute dynamic locking is implemented, so that solid-liquid interface hot spots and explosive nucleation caused by forward charging are eliminated, and monodispersity of particle size distribution of sodium pyroantimonate and high regularity of crystal morphology are realized.

The invention discloses a composite modified lithium manganate positive electrode material as well as a preparation method and application thereof, and belongs to the technical field of positive electrode materials. The structural formula of the composite modified lithium manganate positive electrode material is LiXaOb-coated LiYO2 / LiMn2O4, and the composite modified lithium manganate positive electrode material comprises an inner core consisting of LiYO2 and LiMn2O4, and an LiXaOb coating layer coating at least part of the surface of the inner core, wherein the LiMn2O4 has a porous structure, and pores of the LiMn2O4 are filled with the LiYO2. According to the positive electrode material disclosed by the invention, the lithium manganate is used as the matrix, the pore channels of the matrix are filled with the LiYO2, the surface of the matrix is coated with the LiXaOb, the specific capacity of the positive electrode material is not influenced on the basis of reducing the Jahn-Teller effect of the lithium manganate by filling the pore channels with the LiYO2, and the lithium ion diffusion rate can be accelerated by the LiYO2, so that the rate capability of the material is improved.

A lithium garnet material has the formula Li7+δLa3Zr2-x-y-zM1xM2yM3zO12, where M1 is one or a combination of (Y, In, Mg, Ca, Ba, Sc, Sr, Ru) with oxidation number (valence) lower than 4+, M2 is one or a combination of (Bi, Ta, Nb, Mo, Sb, Te) with oxidation number (valence) higher than 4+, and M3 is one or a combination of (Hf, Ti, Sn, Si) with oxidation number (valence) equal to 4+, subject to 0<x≤1, 0<y≤1, 0≤z≤2, 0<x+y+z≤2, and -0.2<δ<0.2. Also provided is a lithium garnet material which is the same as the aforementioned lithium garnet material except that M1 is one or a combination of (Y, In, Mg, Ca, Ba, Sr, Ru) and M2 is one or a combination of (Bi, Ta, Nb, Mo, Sb, Te, W). Lithium oxide solid-state electrolyte materials have the same formula as the aforementioned lithium garnet materials but also include Ge for M3.

The application relates to the technical field of inorganic chemical materials, and discloses a control synthesis process of a high-temperature-resistant sodium meta-antimonate crystal structure, which comprises the following steps: dispersing diantimony trioxide in a sodium hydroxide aqueous solution with an initial concentration of 6.5-8.0 mol / L, adding sodium meta-aluminate as a crystal lattice directing agent to prepare a precursor bottom solution; heating the bottom solution and maintaining turbulent stirring, performing double-flow path synchronous compensation, adding hydrogen peroxide aqueous solution drop by drop and synchronously adding sodium hydroxide; dynamically setting the coupling relationship of the alkali supplementing rate, the oxidation rate and the reaction stoichiometric ratio, and real-timely offsetting the dilution effect of reaction generated water and solvent water, so that the free sodium hydroxide concentration of the mother liquor in the whole reaction process is maintained to be above 6.0 mol / L until the reaction endpoint is reached; the application dynamically clamps the reaction boundary, blocks the path of the lattice gap water or the surface hydroxyl group, and prepares anhydrous sodium meta-antimonate without a crystallization water removal step in the whole temperature range, so that the foaming problem in high-temperature processing is solved.