Preparation method of high-purity antimony trioxide

Abstract

The invention discloses a preparation method of high-purity antimony trioxide, and belongs to the technical field of antimony trioxide preparation. The preparation method comprises the following steps of: adding crude antimony ore into a hydrochloric acid solution for dipping, introducing chlorine, adding iron powder into an obtained antimony chloride mixed solution, and performing a reaction to obtain an antimony chloride solution; then adding a proper amount of 4 mol / L sodium hydroxide solution with the pH value of 8-9, performing stirring, filtering, washing and drying, and performing roasting in an air atmosphere to obtain antimony trioxide; gasifying the antimony trioxide into liquid, introducing compressed air and a composite lead removal agent, gasifying and quenching prepared antimony trioxide powder, thereby obtaining the high-purity antimony trioxide. According to the method provided by the invention, simplicity in preparation is realized, the usage amount of the composite lead removal agent is small, the cost is relatively low, the composite lead removal agent can be recycled, and no burden is caused to the environment; the purity of the prepared antimony trioxide can reach 99.5% at most, the particle size can reach the nanoscale, and the particle size distribution is uniform.

Description

technical field [0001] The invention belongs to the technical field of antimony trioxide preparation, and in particular relates to a preparation method of high-purity antimony trioxide. Background technique [0002] Antimony trioxide (Sb 2 o 3 ), white crystal powder, yellow when heated, and turn white or gray again after cooling, with a relative density of 5.22 to 5.67. It is an important raw material in chemical production. The application of pure antimony products in high-tech fields such as chemical raw materials is becoming more and more extensive, and with the application requirements in the fine field, the requirements for its purity and particle size are correspondingly higher and higher. [0003] The traditional production methods of antimony trioxide are divided into traditional fire method and wet method. The production of antimony trioxide by fire method is divided into direct method and indirect method. The direct method is to directly produce antimony triox...

AI Technical Summary

Problems solved by technology

The amount of leaching agent used in this method is too much, and if the chemical reagents are not recovered properly, it is easy to cause environmental pollution, which is uneconomical and the cost is too high

[0004] Chinese invention patent CN201711117564.3 discloses a method for purifying antimony trioxide. The method is to hydrolyze industrial-grade antimony trioxide and acetic acid aqueous solution to remove arsenic impurities. This method reduces the amount of waste water and the arsenic impurities. content, but this method does not remove other impurities (such as lead, iron, cadmium, etc.)

Chinese invention patent CN201410328080.3 discloses a method for removing lead, cadmium and iron in the refining of crude antimony. At a furnace temperature of 700-800°C, the impurity metals in the crude antimony solution are removed. This method adopts a lower temperature, and the impurity removal effect is good without rebound, but the compound lead removal dose used in the impurity removal process is relatively low. More, the amount added is 120~150kg / m 3 Antimony liquid, the cost is relatively high, and the particle size of antimony trioxide is relatively large