DEVELOPMENT OF AN INTEGRATED TECHNOLOGY INTENDED TO PROCESS PYRITE SLAG USING CHEMICAL PRE-ACTIVATION

Abikak E.B. Kenzhaliev B.K.
2022 National Academy of Sciences of the Republic of Kazakhstan

News of the National Academy of Sciences of the Republic of Kazakhstan, Series of Geology and Technical Sciences
2022 #3 Issue 453 32 - 51 pp.

The existing methods intended to process pyrite slag require improvement. The novelty of the technology used in this work is the preliminary chemical pyrite slag activation in a sodium bicarbonate solution. It was found that changes of phase composition occur as a result of pyrite slag activation: disappeared phases of trinatrium phosphate of zinc oxide hydrate and dolomite; the amount of sodium thiophosphate; the amount of albite and of natrozharosite phase decreased; the phase of magnesium, calcium silicate and sodium thiophosphate appeared. After activation, the content of the iron-containing phases also increases. Changes of phase composition of pyrite slag are connected with interaction reactions of sodium hydrocarbonate with trisodium phosphate zinc oxide hydrate, natrozharosite and with dolomite with formation of sodium thiophosphate, calcium silicate and magnesium aluminosilicate. At leaching of pyrite cinders after preliminary activation in 15% Н₂ SO₄ solution extraction in solution, wt. % was obtained: CuO 76.8; ZnO 75.9 and Fe₂ O₃ 26.0. Without chemical activation the degree of extraction of non-ferrous metals in sulphuric acid solution is lower by 15 – 20%. As a result of the stage neutralization of the leaching solution of pyrite slag at pH 9.7 the neutralization precipitate-concentrate of non-ferrous metals, wt. % was obtained: CuO 6.4; ZnO 12.55. Concentrate yield was 1.5% of the initial mass of pyrite slag. Smelting of leaching cakes of pyrite slag produced crude iron with chemical composition, wt %: 91.13 Fe; 3.99 Si; i/r P; 2.57 C; 0.81 Mn; 0.025 S.

blooming cast iron , chemical activation , concentrate , leaching , non-ferrous metals , phase composition , pyrite slag

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Satbayev University, Institute of Metallurgy and Ore Benefication JSC, Almaty, Kazakhstan

Satbayev University

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