| 摘要 |
FIELD: chemical industry, more particularly production of acetylene and melting of steel. SUBSTANCE: coke-ash residue resulting from thermal processing of oxidized brown coals comprises (wt %): CaO 47.5; C, 35.4; Fe<SB>2</SB>O<SB>3</SB>, 6.6; SiO<SB>2</SB>, 5.0; Mg, 3.3; Al<SB>2</SB>O<SB>3</SB>, 1.6; S, 0.1 and the balance, 0.5, is mixed with 12.9-28.3% calcium carbonate based on mixture weight. The whole is subjected to high-temperature melting at 2000-2100 C, then cooled to separate CaC<SB>2</SB> and ferrosilicium. Method does not require expensive products. CaC<SB>2</SB> content is 275-285 l/kg and ferrosilicium content is 0.1-0.2 wt %. EFFECT: more efficient preparation method. 2 cl, 3 ex
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