Sulfides of industrial significance are antimony trisulfide and antimony pentasulfide. The physical and chemical properties of barium sulfide are listed in the table below.
Table Physical and chemical properties of barium sulfide
species | Physical properties | Chemical properties |
Disulfide Sb 2 S 3 | There are two forms of crystalline and amorphous, if the former belongs to the orthorhombic system, color ashes, gold metallic luster, density 4.642g / cm 3, hardness HB2 ~ 2.5. Specific heat capacity (20 ~ 500 ° C) 0.34158J ∕ (g · K), melting point 550 ° C, boiling point 1080 ~ 1000 ° C, heat of evaporation 61296J ∕ mol, heat of fusion 23430 ~ 28953J ∕ mol The relationship between vapor pressure (Pa) and temperature is: Lgp=14.671-11200∕T (673K≤T<773K) Lgp=9.915-7068∕T(773K≤T≤1223K) Crystalline antimony trisulfide exists in the natural world as stibnite. Amorphous antimony trisulfide is artificially produced. It has black, gray, red, yellow, brown and purple colors depending on the formation conditions and particle size. | Almost no less than water (solubility of about 0.0176% at 18 ° C), can be slowly oxidized to Sb 2 O 3 in boiling water, easily decomposed by heat, it is already obvious at 600 ° C, the decomposition pressure at 880 ° C can reach 2452.58 Pa; Oxidation, heating to 290 ° C when the particle size is 0.1 mm, ie spontaneous combustion, the reaction is: 2Sb 2 S 3 +9O 2 = 2Sb 2 O 3 + 6SO 2 This reaction is the basis of the volatile calcination; it can be oxidized to SbCl 3 by Cl 2 or FeCl 3 to precipitate elemental sulfur, which is the basis for the oxidative-hydrolysis method to obtain ruthenium. Sb 2 S 3 can form Na 3 SbS 3 with Na 2 S, which is the basis of alkaline leaching wet refining; Sb 2 S 3 and Sb 2 O 3 can be interactively converted into metal ruthenium and SO 2 , but in an inert atmosphere, 2Sb 2 S 3 ·Sb 2 O 3 (germanium glass) is formed, and Sb 2 S 3 can be replaced by iron. Metal ruthenium, this reaction is the basis of precipitation smelting |
Disulfide Sb 2 S 5 | Often a golden yellow amorphous powder, commercially known as golden enamel, with a density of 4.12 to 4.2 g ∕ cm 2 | The molecular composition is Sb 2 S 3 ·2S, which is easy to spontaneously ignite in air. It can be decomposed into Sb 2 S 3 and elemental sulfur when heated to 120-170 ° C. Industrially, sulfuric acid or hydrochloric acid and sodium thiocyanate are used. Preparation of Sb 2 S 5 |
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