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Journal of the Korean Chemical Society (JKCS)

ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 11, Number 1
JKCSEZ 11(1)
February 20, 1967 

Direct Acid Leaching of Zinc from Marmatite Ores (1) Autoclave Treatment of Domestic Marmatite Ores with Sulfuric Acid Oxygen

Marmatite 광의 직접산침출에 관한 연구 (제1보) 국산 Marmatite 광의 산소가압하에서의 산침출에 관한 연구
Kim Jae Won

The direct acid leaching of domestic Marmatite concentrate at elevated temperatures and pressures was investigated. Almost 100 percent of zinc was extracted from the concentrate liberating free sulfur in 4 hours at 100℃ when the oxygen partial pressure was 5 atm. in sulfuric acid solution. By applying the Arrhenius equation to leach reaction in the range of 60° to 100℃ at the same oxygen partial pressure, 15.7 kcal per mole of activation energy was calculated. At the initial stage of leaching, the rate of reaction increased linearly by increasing temperature and pressure. The concentration of sulfuric acid gave minor effect to leaching velocity in the range of 5 to 20 percent. The particle size should be under 270 mesh for 100 percent extraction of zinc.
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