| 摘要 |
FIELD: chemistry. ^ SUBSTANCE: method of sulphate-ion absorption in metal chloride aqueous solutions by reaction of sulphate-ions with calcium chloride at higher temperature with following precipitation and removal of solid calcium sulphate. Calcium chloride source is production residue of calcium chloride, containing calcium chloride within 15-38 mass % and water-insoluble substances within 2-55% of residue weight. Production residue of calcium chloride is coagulated sludge chloride calcium suspension of mass fraction of calcium chloride within 25-38% and mass fraction of water-insoluble substances within 2-14 % or filter cake, produced by filtering of sludge chloride calcium suspension and containing calcium chloride within 15-30 mass % and water-insoluble substances within 20-55 mass %, or mixed specified sludge suspensions and specified filter cake. ^ EFFECT: invention allows for widening of process raw materials sources and for elimination of gypsum precipitation on process equipment. ^ 1 tbl, 5 ex, 12 cl |
