Journal . ws notliiug of actual mannrialvalue except the lime salt, and that is generallypresent in the dissolved manure in abundance. Z. GVPSUM AS USED FOR DRylNQ M.^-NUEES fUOM THE Den. ] I v(lrated sulphate of calcium 82 • 70 > ^ Iron nncl .alumina y Alkaline sails IlW Silica Moisture, &? 12w: inn-iii The refuse gypsum frequently contains someorganic matter—poorly nitrogenous—and may givehalf a per cent, or so of ammonia. The following isanalysis of one sample :— Table ;irosiTioN OF Refuse Gitsum. Sulphntc of caloiuui 6n6t Ihosphntes 5:i7 Oxidi! of iron, &
Journal . ws notliiug of actual mannrialvalue except the lime salt, and that is generallypresent in the dissolved manure in abundance. Z. GVPSUM AS USED FOR DRylNQ M.^-NUEES fUOM THE Den. ] I v(lrated sulphate of calcium 82 • 70 > ^ Iron nncl .alumina y Alkaline sails IlW Silica Moisture, &? 12w: inn-iii The refuse gypsum frequently contains someorganic matter—poorly nitrogenous—and may givehalf a per cent, or so of ammonia. The following isanalysis of one sample :— Table ;irosiTioN OF Refuse Gitsum. Sulphntc of caloiuui 6n6t Ihosphntes 5:i7 Oxidi! of iron, &c Orpuiic matter IS)CI Insoluble nnitt-r 1152 Moisture 20l lon-no Ammonia liS Colchifd Phosplinlcx.—These are low-class materialscontaining some considerable proportion of carbonateof calcium. When ealcine<l they lose water and partof theu- carbonic anhydride, and so become alkalinefrom the presence of caustic lime. ,iws.] THE JOURNAIj of THE SOCIETY OF CHEMICAL INDUSTRY. 89. Table of Calcined Bokdeaux Phosphate. Jfoisturo 0 H Vliospbatcs 22-W Carbonat<? of lime and caustic 7202 Oxide of iron, io ila SMica i-ii lCO-00 The action of this substance is twofold: (1) it absorbssome of the water, and (2) it takes np the excessof sulphuric acid to form calcic sulphate. It requiresto be added with great care, as if an excess is presentover and above what is required to neutralise the vitriol, then the further action proceeds of thecaustic or carbonate of lime combining Avith thesoluble phosphate of the manure and revertingit back to the insoluble state according to theequation— CaH^ 2 PO4 + 2 CaO = Caj 2 POi + 2 H;0, or CaHi 2 PO4 + 2 CaCOa = Ca, 2 PO^ + 2 + 2 CO;. Lime.—The form of lime usually employed isknown as lias lime, and is obtained from thesouth of England. This variety nothingthat is not present in the ordinary varieties of lime,and can give no better results. Its composition is asfollows:— 90 THE JOURNAL O
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Keywords: ., bookcentury1800, bookdecade1880, booksubjectchemist, bookyear1882
