<報文>亜鉛精鉱の硫化水素発生型硫酸浸出について

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In order to obtain H_2S gas and electro-winning liquor, sulfuric acid teaching of the Attritor-ground zinc sulfide concentrate was investigated in the absense of oxygen at atmospheric pressure. Factors investigated were temperature, particle size, pulp density and Zn and H_2SO_4 concentrations in solution Particle size and H_2SO_4 concentration greatly influenced the extraction of Zn from the concentrate, while the Zn concentration did not. In addition, the extraction efficiency increased sharply at the boiling temperature. When the zinc concentrate was ground to 2 μ in mean diameter and leached by a solution containing 50 g/l Zn and 200 g/l H_2SO_4 at the boiling temperature, 90% Zn extraction was achieved. The major portion of the reacted sulfur formed H_2S, but minor amounts of elemental sulfur were formed on the mineral surfaces. A flotation phenomenon caused by the presence of sulfur on the particles occurred and the extraction efficiency decreased. Washing with CS_2 or regrinding of the leached residue followed by second stage leaching resulted in a high recovery of zinc. The concentrate reactivity decreased with surface oxidation of the minerals. Although engineering development is needed, the results suggest a strong possibility of realizing a zinc winning process yielding elemental sulfur. This process would consist of common roasting, direct leaching by spent electrolyte, electro-winning and the Clauss process.
東北大学の論文
1978-09-16

<報文>亜鉛精鉱の硫化水素発生型硫酸浸出について

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