CRUDE MIXTURE FOR PRODUCING HEAT-RESISTANT INORGANIC PIGMENTS, METHOD OF PRODUCING HEAT-RESISTANT INORGANIC PIGMENTS AND APPARATUS FOR REALISING SAID METHOD Russian patent published in 2011 - IPC C09C1/00 C09C3/04 B02C17/00 C03C1/04 

FIELD: chemistry.

SUBSTANCE: crude mixture for producing heat-resistant inorganic pigments includes a carrier and colouring additives and has the following composition in wt %: alumina or wastes from producing electrical insulators - scrap glased and unglased porcelain insulators or scrap dried unburnt insulators - 40-95; oxides and/or carbonates and/or oxalates of metals - 5-60. To obtain pigments, the crude mixture of the said composition undergoes dry grinding and mixing in a periodic action device to fineness which enables passage through a sieve of 10000 holes/cm² for 1-4 hours. The obtained mixture then undergoes thermal treatment to temperature 650-1340°C and that temperature is maintained for 1.5-4 hours. Further, the furnace is cooled to room temperature. The obtained mixture undergoes drying grinding in the periodic action device again for 1-8 hours until obtaining not more than 1.0% residue on sieve 20000 holes/cm². The apparatus for producing pigments has a revolving housing with an inner lining which is partially filled with grinding bodies, a loading-unloading device and a drive. The housing has conical faces and is fitted with a dust-protective cover outside, which is joined to the container for the end product which is placed under the housing. The inner lining is made from polyurethane, and grinding bodies have a steel core with an outer polyurethane coating.

EFFECT: invention enables to obtain heat-resistant pigments with a wide colour gamma using wastes from production of electrical insulators, and also increases environmental safety.

4 cl, 2 dwg, 2 tbl, 17 ex