C - Chemistry – Metallurgy – 22 – B
Patent
C - Chemistry, Metallurgy
22
B
53/114
C22B 21/00 (2006.01) C01F 7/06 (2006.01) C01F 7/32 (2006.01) C01F 7/56 (2006.01) C01G 49/06 (2006.01) C01G 49/10 (2006.01) C22B 1/00 (2006.01) C22B 3/10 (2006.01)
Patent
CA 1173255
ABSTRACT The invention relates to an improved process for reducing the iron convent of iron-, silicon- and aluminium- containing raw materials and for producing ferric oxide, optionally along with an alumina concentrate. According to the invention the iron content of mineral raw materials, e.g. bauxites, clay minerals, colliary rocks, red muds, etc. is eliminated by passing through one or more beds prepared from the unground but preferably prebroaken end sized raw material an aqueous hydrochloric acid solution, the concentration of which exceeds 100 g./lit., at a temperature below 90 °C, preferably at room temperature, optionally in the presence of a flocculating agent. By pyrolytic decomposition of the ferric chloride prepared ferric oxide can be produced. The bed reduce of reduced iron content can be untilized in the Bayer process or producing alum earth, as a starting substances of ceramic industry or, after treating with sulfuric acid, dissolving in hydrochloric acid or water, elimination of silica, pyrolytic decomposition of the alumina sulfate obtained, as an alumina concentrate.
384198
Csovari Mihaly
Csurgay Istvan
Czegledi Bela
Erdelyi Miklos
Illi Jozsef
Fetherstonhaugh & Co.
Mecseki Ercbanyaszati Vallalat
Tatabanyai Szenbanyak
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