43 results about "Fluorosilicate salt" patented technology

A method for treating phosphate-containing wastewater, such as phosphogypsum pond water. The method includes the steps of: (a) adding a first cation to the wastewater to precipitate fluorosilicate from the wastewater; (b) adding a second cation to the wastewater to precipitate fluoride from the wastewater; (c) raising the pH of the wastewater to precipitate the second cation from the wastewater; (d) removing residual silica from the wastewater; and (e) precipitating phosphate from the wastewater. The precipitated fluorosilicate may be sodium fluorosilicate. The precipitated phosphate may be struvite.

The invention discloses a method for detecting a mixed acid solution in the manufacturing process of a polycrystalline silicon solar cell. The method is used for detecting a mixed acid system which consists of hydrofluoric acid, nitric acid and fluorosilicic acid. The method comprises the following steps of: detecting the total acid concentration of the solution by using an acid-base neutralization method; heating and boiling the solution which is subjected to acid-base neutralization, decomposing fluorosilicate to generate hydrogen ions, determining the content of the hydrogen ions by alkali liquor titration, and thus obtaining the concentration of the fluorosilicic acid by calculation; detecting the concentration of the nitric acid in the mixed acid solution by using an oxidation-reduction titration method; and subtracting the concentration of the fluorosilicic acid and the concentration of the nitric acid from the total acid concentration, and thus obtaining the concentration of the hydrofluoric acid. The method is simple in flow, easy to operate and low in economic investment and can be applied to long-term monitoring of a texturing process and an etching process in the production process of the polycrystalline silicon solar cell and stability of equipment, manpower resources are saved, high-end equipment is eliminated, detection accuracy can be over 95 percent.

The invention discloses a cleansing agent for ceramic filter plate. The cleansing agent for the ceramic filter plate comprises the following raw materials in parts by weight: 0.1-1 part of a principal agent, 0.11-0.6 part of an adjuvant, 0.01-0.1 part of an oxidant and 1.7-6.5 parts of an acidity adjuster. According to the invention, the principal agent is one or two of hydroxy ethyl fork bisphosphonic acid and hydroxy ethyl fork bisphosphonat, the adjuvant is one or more of soluble nitrate, chloride, fluoride and fluoride silicate. The cleansing agent prepared according to the formula can effectively clean and remove blockages on the surface or the inside of micro-pores in the ceramic filter plate, especially a ceramic filter plate in a ceramic filter used for filtrating high-sulphur ore pulp. The cleansing agent can dissolve substances enriched in micropores with a good cleansing effect. Specifically, tests prove that solid-liquid separation rate of a ceramic filter plate washed by the cleansing agent can restore to 70%-82% that of the initial state.

The invention relates to the technical field of industrial gas separation, in particular to a fluosilicate porous hybrid material and a preparation method and application thereof. The structural general formula of the fluosilicate porous hybrid material is [Cu(dpds)2(SiF6)]n, and dpds is 4,4'-dipyridyl disulfide. A metal salt used by the fluosilicate porous hybrid material is copper hexafluorosilicate, the organic ligand is 4,4'-dipyridyl disulfide, and the fluosilicate porous hybrid material is an anionic pillared metal organic framework material with a proper pore diameter and a proper fluorination functional site; the preparation method is low in raw material price, cost-saving, simple to operate, easy to control conditions and easy to industrialize; and the fluosilicate porous hybrid material provided by the invention has appropriate pore diameter and fluorinated functional sites, can enhance the recognition of acetylene through the action of hydrogen bonds, can separate C2H2/C2H4mixed gas and/or C2H2/CO2 mixed gas at the same time, and has higher separation selectivity, larger adsorption capacity and higher separation performance than most existing solid adsorption materials.

The invention provides a preparation method of fluorosilicate red fluorescent powder. The red fluorescent powder is shown by a general formula I: M2SiF6: Mn<4+> (I), wherein M is selected from one or two of K and Na. The preparation method of the fluorosilicate red fluorescent powder comprises the following steps: (1) adding MMnO4 and MF into hydrofluoric acid, carrying out stirring until the aforementioned three materials are uniformly mixed, and dropwise adding H2O2 into the mixture until the color of the solution is changed to obtain mixed liquor; (2) adding a powdery substance containing silicon oxide into the mixed liquor, heating the liquor with the substance at first for full reaction, then carrying out cooling to separate out a crystal, and carrying out filtration to obtain a yellow solid; and (3) washing the yellow solid obtained in the step (2) by separately using a small amount of pure water and an organic solvent, and carrying out drying treatment to obtain the red fluorescent powder. The invention also provides a preparation method of a composition containing the fluorescent powder, the red fluorescent powder or the composition containing the fluorescent powder prepared by using the method, and applications of the fluorescent powder or the composition containing the fluorescent powder in LED (Light-Emitting Diode) illumination or backlight elements or equipment.

The invention relates to a method for treating dangerous waste residues, in particular to a treatment method for dangerous solid waste containing fluorosilicate. The method comprises the following steps that a raw material cushion layer containing calcium carbonate is formed at the bottom, then a waste residue layer containing fluorosilicate, a raw material middle layer containing calcium carbonate and a soil layer are sequentially laid from bottom to top, and water flows through the soil layer, the middle layer containing the calcium carbonate, the waste residue layer containing the fluorosilicate and the cushion layer containing the calcium carbonate from top to bottom. According to the treatment method, harmless treatment can be carried out on the dangerous solid waste containing the fluorosilicate, a waste residue field with fluorine pollution can be repaired, the calcium carbonate reacts with the dangerous solid waste containing the fluorosilicate to generate non-toxic and water-insoluble calcium fluoride precipitates, fluorine elements in the solid waste and waste residues are effectively removed, fluorine pollution is eliminated, the concentration of fluorine ions in discharged reaction liquid is less than 10 mg/L, and the concentration meets the national sewage comprehensive discharge standard.

The invention belongs to the technical field of building materials, and particularly relates to a sponge brick produced from aluminum ash and a preparation process of the sponge brick, and the sponge brick produced from the aluminum ash is prepared by taking the aluminum ash as a main raw material and adding a pore forming agent, a fluxing agent, a high-temperature binding agent and a forming binding agent as auxiliary materials. According to the invention, the aluminum ash in the electrolytic aluminum industry can be effectively consumed, on one hand, the problem of environment-friendly discharged waste disposal of electrolytic aluminum enterprises is solved, on the other hand, efficient utilization of resources is realized, on the other hand, sponge brick products with good market prospects are provided, and the economic benefit, the environment-friendly benefit and the social benefit are very remarkable; meanwhile, the problem of fluorine pollution of the aluminum ash can be well solved, fluorine and aluminum-silicon-calcium in the aluminum ash form fluorosilicate glass with stable chemical properties at high temperature, and fluorine is not dissolved out any more.