<報文>選択硫酸化による複雑硫化鉱処理法の検討 : 酸濃度および処理温度について

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  • センタク リュウサンカ ニ ヨル フクザツ リュウカコウショリホウ ノ ケントウ
  • <Original Papers>Effects of Acid Concentration and Temperature on the Selective Sulfatization of Cccmplex Sulfide Ores

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Selective sulfatization process for complex sulfide ores containing copper, iron, lead and zinc was studied at this institute about ten years ago. A brief description of this method is as follows : the concentrate of bulk flotation was mixed with 60% sulfuric acid and kept at about 160℃ for one hour. The solution containing zinc sulfate was then filtered from the residue consisting mainly of chalcopyrite, pyrite and lead sulfate. The residue was then subjected to the differential flotation to separate components. However, there are some difficulties in carrying out the selective sulfatization by this method, such as the corrosion of the vessel used and H_2SO_4 recovery from the spent electrolytic solusion of zinc due to the use of considerably high concentrated leaching solution. In order to minimize these difficulties, application of more diluted acid solution was considered. In the present investigation, sulfatization reaction proceeded in an autoclave at high temperature. Effects of temperature, acid concentration and volume of acid solution were studied with several kinds of bulk concentrate. In addition, the sulfatization reaction were also thermodynamically discussed. From the results obtained, it was found that the temperature was of the most effective factor for the sulfatization reaction. By the use of 20～30% (by volume) sulfuric acid, zinc was extracted sufficiently from the concentrate, if the reaction proceeded at appropriate high temperature under sufficient supply of acid solution. Because of the presence of hydrogen sulfide, the amount of dissolved copper was insignificant in every case. Differing from the former results, the amounts of iron and copper extracted in the solution were nearly constant even at higher temperature in the present investigation.

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