Antimony trioxide is a white crystalline powder with a melting point of 655°C and a boiling point of 1550°C. It is soluble in concentrated hydrochloric acid, sulfuric acid, alkali solutions and hot tartaric acid solutions. Slightly soluble in water, dilute nitric acid and dilute sulfuric acid, it is mainly used as a pigment, flame retardant, mordant, catalyst, and can also be used to synthesize antimony salts.
The method of preparing antimony trioxide from potassium antimony tartrate is as follows:
To prepare antimony trioxide from potassium antimony tartrate, add ammonia water to antimony tartrate. In the boiling solution of potassium (one part of potassium antimony tartrate K(SbO)C4H4O6 is dissolved in 10 parts of water), boil for a period of time, filter and wash to obtain antimony trioxide. Among them, only trace amounts of silicon and magnesium were detected through qualitative spectral analysis of the antimony trioxide prepared by the hydrolysis method. Suitable for spectral analysis standards. Add 15g of analytically pure antimony trioxide to a 500ml beaker, then add 30ml of high-purity hydrochloric acid (1+1), and dissolve it while stirring. Use a cleaned glass sand funnel to filter the solution to remove insoluble impurities, and then dilute the filtrate to 400 ml with high-purity water. At this time, a white precipitate of antimony oxychloride precipitates. After the solution is clear, pour out the clear liquid and wash the precipitate several times with the pouring method. Add 200ml of high-purity ammonia (1+25) to the washed precipitate and boil for 5 to 10 minutes. At this time, the antimony oxychloride is transformed into antimony trioxide, and the generated antimony trioxide particles are much smaller than the antimony oxychloride. Pour out the clear liquid and boil it several times with dilute ammonia water in the same way. Check the washing liquid with silver nitrate. When the decanted liquid no longer contains chloride ions, it has been completely converted into antimony trioxide. Then wash the precipitate several times with high-purity water pouring method. Use a Buchner funnel to suction filter and then wash the precipitate with high-purity water until the washing liquid becomes neutral. The washed precipitate is dried in an oven at 150°C to a constant weight, and after cooling, it is the finished product of antimony trioxide.
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