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1975年,挪威鹰桥镍矿业公司开始将过去一直使用的Hybinette电解精炼法改为新的氯气浸出法来生产阴极镍。虽然1978年就完成了其电积系统的改造,但更进一步的重大改进直到1987年才完成。鹰桥精炼厂在完成了1985—1987年的重点扩建工程项目后,其镍的生产能力达到了54000t/a。氯气浸出法的主要原料为加拿大安大略省萨德伯里市的鹰娇冶炼厂和博茨瓦纳BCL公司塞莱比-皮克威冶炼厂生产的转炉高冰镍。进厂混合料典型成分为:Ni40—45%,CU25—30%,S20—22%,Fe2—3%和Co1.0—1.5%。此高冰镍经第一道工序氯气浸出再经一系列浸出-沉淀槽,镍被选择性地溶解出来,而高冰镍中所含的全部铜和硫实际上都以CuS形式存在于浸出渣中。为了改善从浸出渣中提镍,1986年,鹰桥在其氯气浸出法中又增加了一道高压釜处理工序。氯气浸出法得到的浓氯化镍溶液用下列工序进行净化:(1)沉淀铁和砷;(2)溶剂萃取钴及其他次要元素;(3)沉淀铅等残余杂质。这时,镍溶液可送入电解车间,用电积法生产各种镍产品。电解过程产生的氯气直接返回氯气浸出槽。负载的有机相经反萃和溶液净化后也可电积生产钴。含镍的硫化铜浸出渣在沸腾焙烧炉中进行死烧。回收的硫制成硫酸出售,焙砂用铜废电解液浸出,用电积法从中生产出阴极铜,再从铜浸出渣中回收各种贵金属和残余的贱金属。鹰桥氯气浸出法是非常通用的。即使在原料含杂质量波动范围很大的情况下,也能生产出纯度很高的金属来。
In 1975, Norwegian Eagle Bridge nickel mining company began to use the Hybinette electrolytic refining has been used to new chlorine leaching method to produce cathode nickel. Although its electrowinning system was completed in 1978, further major improvements were not completed until 1987. After the completion of the key expansion project of 1985-1987, the Yingqiao refinery reached a nickel production capacity of 54,000 t / a. The main raw materials for the chlorine leaching process are converter iced nickel, produced at Eagle Jays Smelter in Sudbury, Ontario, Canada, and at the Selebi-Pickaway refinery at BCL in Botswana. Typical composition into the plant mixture: Ni 40-45%, CU25-30%, S20-22%, Fe2-3% and Co1.0-1.5%. The high-nickel ice is selectively leached out through a series of leaching-sedimentation tanks after the first ice-pickling process of chlorine gas leaching. However, all the copper and sulfur contained in the high-ice nickel are actually present in the leached slag as CuS. In 1986, Eagle Bridge added an autoclave process to its chlorine gas leach process to improve nickel extraction from leach residues. Concentrated nickel chloride solution obtained by chlorine leaching method is purified by the following steps: (1) precipitation of iron and arsenic; (2) solvent extraction of cobalt and other minor elements; (3) precipitation of residual impurities such as lead. At this time, the nickel solution can be sent to the electrolysis plant to produce various nickel products by the electrowinning method. The chlorine gas from the electrolysis process returns directly to the chlorine leach tank. The loaded organic phase can also be electrowinned to produce cobalt after stripping and solution purification. Nickel-containing copper sulfide leaching residue in the roaster roasted. The recovered sulfur is sold as sulfuric acid, calcine is leached from the waste electrolyte of copper, cathode copper is produced from it by the electrowinning process, and various precious metals and residual base metals are recovered from the copper leach residue. Eagle Bridge chlorine leaching method is very common. Even in the raw materials containing impurities fluctuations in a wide range of circumstances, but also to produce high purity metal to.