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本文介绍日本岩手县的赤金铜选矿厂从浮选尾矿中回收自然铋和白钨矿的基本研究的试验结果和半工业性工厂的操作数据。供给试验系统的铜尾矿,主要是由石炭纪石灰岩和花岗岩(花岗闪长岩)所组成,并混有矽卡岩矿物,例如石榴石,它含金0.4克/吨、银4克/吨、0.025%铋和0.025%WO_3。尾矿矿浆用旋流器脱泥,再给入混合浮选系统,泡沫产品含有0.3%铋和0.3%WO_3及磁黄铁矿与方解石。药剂采用油酸和煤油。泡沫产品通过串联配置的詹姆斯(James)摇床,摇床精矿中的磁黄铁矿,用强磁选机除去。非磁性物料是铋一钨混合精矿,它含30%铋和30%WO_3以上。混合精矿用高压釜浸出。在碱性溶液中,白钨矿被分解而自然铋部分地被氧化。然后将矿浆过滤,并用常规方法从滤液中沉淀白钨矿,它含75%以上的WO_3;残渣是铋精矿,它含45%铋、500克/吨金和1000克/吨银。
This paper presents basic experimental results and semi-industrial plant operating data on the recovery of natural bismuth and scheelite from the red gold copper concentrate at Iwate Prefecture in Japan. The copper tailings supplied to the test system consist mainly of Carboniferous limestone and granite (granodiorite) mixed with skarn minerals such as garnet, containing gold 0.4 g / t, silver 4 g / Ton, 0.025% bismuth and 0.025% WO_3. Tailings pulp slime desliming cyclone, and then fed into a mixed flotation system, foam products containing 0.3% bismuth and 0.3% WO_3 and pyrrhotite and calcite. Pharmacy using oleic acid and kerosene. Foam products are removed by a strong magnetic separator through a James shaker in tandem, pyrrhotite in the shaker concentrate. The non-magnetic material is a bismuth-tungsten mixed concentrate containing 30% bismuth and 30% WO_3 or more. Mixed concentrate leaching with autoclave. In alkaline solution, scheelite is decomposed and natural bismuth is partially oxidized. The slurry is then filtered and the scheelite is precipitated from the filtrate by conventional means containing more than 75% WO3; the residue is a bismuth concentrate containing 45% bismuth, 500 g / tonne gold and 1000 g / tonne silver.