33 results about "Soluble oxalate" patented technology

The invention relates to the technical field of preparation of a monodisperse powder material, and provides a controllable preparation method of monodisperse copper oxalate powder. The method comprises the following steps: uniformly mixing a soluble copper salt solution, a soluble oxalate solution and an ethylenediamine tetraacetic acid (EDTA) solution in a molar ratio of 1:1:(0-1):1:5; standing in certain temperature condition; filtering, washing and drying to obtain the monodisperse copper oxalate powder. The method provided by the invention has the following beneficial effects: operation iseasy, monodispersity of copper oxalate is high, large-scale preparation is easy to implement, and preparation can be performed at room temperature; accurate control on the size of copper oxalate particles is realized, and the size can be controlled to 2-4 microns; the monodisperse copper oxalate powder can serve as a precursor and can be subjected to thermal decomposition to obtain copper oxide,cuprous oxide and metal copper powder.

The invention discloses a lithium-rich manganese-based positive electrode material with controllable appearance and dimensions and a preparation method therefor. The general formula of the positive electrode material is xLi<2>MnO<3>.(1-x)LiMO<2> (M is one or more of Mn, Ni or Co, and x is greater than 0 and less than 1); the preparation method comprises the following steps of adding a soluble transitional metal into a solvent and stirring into a uniform solution; then adding a surfactant to the solution, stirring uniformly and then adding a soluble oxalate solution; next, performing a co-precipitation reaction at a normal temperature to obtain an oxalate precursor; and performing pre-sintering on the precursor and then mixing with a lithium salt uniformly, and finally, performing a high-temperature solid-phase reaction to obtain the lithium-rich manganese-based positive electrode material. The obtained positive electrode material is uniform in granule grain diameter distribution, high in degree of crystallinity, controllable in appearance and dimensions, excellent in cycling performance and high in rate capability; and in addition, the method is simple in operation, and green and environment friendly.

The invention discloses a process for producing high-purity basic magnesium carbonate from dolomite, which adopts a carbonization method and uses dolomite as a raw material. The method comprises the following steps: grinding, calcining, digesting the calcined dolomite, filtering, carbonizing magnesium emulsion, pyrolyzing a heavy magnesium solution, and drying to obtain basic magnesium carbonate.The carbonization process of the magnesium emulsion is as follows: after the magnesium emulsion is cooled, carbon dioxide is introduced; when the pH value reaches 7.5-9.5, oxalic acid or soluble oxalate is added to ensure that the concentration of oxalate groups in the system is 0.001-0.01mol / L; and after the system is mixed evenly, carbonization is performed continuously until the pH value is 6.5-7.0, filtration is performed, the filtrate is the refined heavy magnesium solution, and the residue is light calcium carbonate. By adding oxalic acid in the digesting process, the technical problem of the dolomite carbonization method that calcium and magnesium are difficult to separate thoroughly can be solved. The process is simple, is easy to control and has high magnesium oxide extraction rate and high product purity.

The invention belongs to the field of preparation of inorganic non-metallic materials, and in particular relates to a preparation method of hydrated barium oxalate (BaC2O4·0·5H2O) microcrystals with the appearance of firewood. At 50°C, aging for 2-24 hours, then filtered, washed, and dried to obtain hydrated barium oxalate microcrystals. The soluble divalent barium salt of the present invention is one or a mixture of barium chloride, barium nitrate or barium acetate, and the soluble oxalate is one or a mixture of sodium oxalate, potassium oxalate or ammonium oxalate. The process of the invention is simple and easy, high in purity, low in impurity content, good in dispersibility and low in cost, and the obtained product has a diameter of 1-3 mm and a length of 5-15 mm. The hydrated barium oxalate crystallite with the appearance of firewood prepared by the invention can be widely used in the fields of automobiles, electronics, machinery, chemical industry, construction and the like, and is also an excellent precursor for preparing other barium salt functional materials.

Disclosed herein are oxalate inducing enzymes with pH and thermal stability and methods of using for treatment of oxalate related conditions for in food processing.