and vts compoundsAtomic weight, 120 sp, gr., 67; meltingpoint, 630 degrees C. Antimony is found naturally in small quantities, but m greater quantities it exists combined with oxygen as socalled white antimony, and in another form as antimony ochre. Its chief ore is the trisulphide stibnlte, or grey antimony me, whilst other combinations with oxygen and sulphur are antimony blende, and red antimony. Antimony mining is conducted 011 a considerable scale in Bolivia, China. Mexico, the United States of America, and elsewhere. Antimony is a bright bluishwhite crystalline metal, largely used in making alloys. Type metal consists of lead 75 parts, antimony 20 parts, and tin 5 parts. Stereotype metal consists of lead 112, antimony t8, tin 3 parts; and Britannia metal, tin 140, copper 3, antimony 9, all of which give fine and sharp castings. Antimony is also used tor producing the appearance of polished steel on papiermache the tetroxide is used for rendering enamels opaque, and the trioxide for colouring glass, and as a paint. The red sulphide is used for vulcanizing rubber and for preparing the striking surface on safety match boxes. Alloyed with lead, it has been largely used in the great war in preparing shrapnel bullets, and the sulphide in making shell primers and as a smoke producer. The metal is prepared by heating the brokenup native trisulphide with hall its weight of scrap iron in plumbago crucibles, when iron sulphide is formed, and the metallic antimony set free, as follows: Sb2S3 + 3Fe = 28b + 3FeS or the selected sulphide separated from the associated rocky matter of the ore can be mixed with charcoal or coal and heated in a reverberatory furnace the sulphur in this way is burnt off as sulphur dioxide. Antimony is a bad conductor of heat and electricity and is not acted upon by the air. When strongly heated, it burns in air or oxygen with a brilliam light and forms antimony trioxide. When thrown into chlorine gas it takes fire and forms antimony trichloride. There are two chlorides of antimonyviz., the trichloride, which is used as a mordant and for bronzing iron, etc., and the pentachloride and three oxidesviz., the trioxide, the tetroxide, and the pentoxide 5. The trichloride is a colourless crystalline body, soluble in water and alcohol, and is used in bronzing iron, as a mordant for making lakes, and colouring zinc black. When the trioxide is dissolved in a boiling solution of potassium hydrogen tartrate, potassium antimony tartrate or tartar emetic is formed. This compound is used medicinally. Two sulphides are knownviz., the trisulphide, which is used as a pigment, and the pentasulphide. The trisulphide occurs in nature as the black crystalline stibnite, but when precipitated from solutions it is an orangered compound. Antimony hydride or antimoniuretted hydrogen is produced when an antimonial solution is brought into contact with zinc and sulphuric acid. It is a colourless gas of offensive odour, which can be obtained also in liquid and solid forms. Antimony lactate 3 is soluble in water, and is used as a mordant. Antimony forms compounds with the alkyls similar to those of arsenic, for example, trimethylstibine, Sb3, a disagreeable inflammable liquid.
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