Method for dissolving antimonous sulfide into stibious

Abstract

The invention discloses a method for dissolving antimonous sulfide, which utilizes the acidity and coordinating capability of hydrochloric acid and phosphoric acid to dissolve through a chemical dissolving method. In the method, a chemical product antimonous sulfide, the chemical purity of which is 97.0%, is utilized as a dissolving object, the content of antimonous sulfide can be measured after antimonous sulfide is dissolved under the optimum condition, and the measured result data can be used to illustrate the soluble completeness; the optimum condition of dissolving is as follows: adding 12ml of hydrochloric acid and 5ml of phosphoric acid; covering a watch glass, shaking the watch glass on an electric stove while slowly heating until the solution is boiling slightly, removing the watch glass, and maintaining slight boiling until the color of the solution is light yellow and transparent and is completely dissolved. Oxidation-reduction titration is used to measure the content of antimonous sulfide, therefore, the dissolved antimonous sulfide exists in the solution in the form of antimony (III), instead of in form of antimony (V). By using the dissolving method of antimonous sulfide in the invention, the measured result after a sample is dissolved reaches 96.82, which differs 0.18% to the actual value. In the method, the sample can be completely dissolved, and the solvent is non-toxic and safe and has low price, thereby meeting the requirements of environment protection and industrial production. The established dissolving method is also applied to dissolve antimonous sulfide in an antimonite and antimonous sulfide used as an additive in the industry and has wide application prospect.

Description

Method for dissolving antimony trisulfide into trivalent antimony technical field The invention relates to a method for dissolving antimony trisulfide, more particularly, relates to a method for dissolving antimony trisulfide into trivalent antimony with a nontoxic and safe mixed acid of hydrochloric acid and phosphoric acid. When determining the content of antimony trisulfide, redox titration is usually used. Therefore, after dissolving antimony trisulfide, it should exist in the form of trivalent antimony instead of pentavalent antimony in the solution. Background technique Antimony trisulfide is also called antimony sulfide (Sb2S3), black solid powder. Insoluble in water, acetic acid, slowly soluble in hot concentrated sulfuric acid, soluble in concentrated HCl, alcohol, ammonium hydrogen sulfide, potassium sulfide solution. The melting point is 548°C and the boiling point is 1080-1090°C. Antimony oxide is formed after pyrolysis. Sb(III) is soluble in concentrated H...

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