FIELD: process engineering.
SUBSTANCE: invention relates to pelletising of calcium-bearing slime materials including thermal electric power station water treatment wastes, metallurgy slimes, stone-working, etc., to be used in agriculture for deoxidation of podzolic soils, as fluxes at iron casting from iron ore, etc. Proposed process comprises the steps that follow. Preparation of initial materials for pelletising by wetting to required level, introduction reagent composed of sulphate containing substance, that is sulphuric acid and/or its water-soluble salts. Note here that said reagent is added in amount of 0.06-0.2 grams of sulphate-ion per 1 gram of dry initial material. Components are mixed to homogeneous mass at 20-60°C and pelletised. Obtained material is dried at 65-170°C for 1-2.5 hours.
EFFECT: stable high strength.
1 dwg, 5 tbl, 6 ex
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