Technology for recycling valuable metal from jarosite slag

Abstract

The invention discloses a technology for recycling valuable metal from jarosite slag. The technology is characterized in that a dispersing agent is added to water to be evenly stirred; then, jarosite slag and a reducing agent are added to be evenly stirred; and lime is added to be evenly stirred to obtain sediment containing ferric oxide and calcium sulfate, and liquid and solid are separated. A water repellent agent and a floating agent are added to liquid, and valuable metal is recycled. A solution obtained after the valuable metal is recycled can be used as water for dissolving jarosite slag to be recycled, and the solid sediment can be used as raw materials used in the cement production process.

Description

technical field [0001] The invention relates to a method for recovering metals, in particular to a method for recovering valuable metals from jarosite slag (jarosite). Background technique [0002] In the past ten years, my country's lead-zinc metallurgy has maintained a momentum of rapid growth. In 2010, the total output of lead-zinc reached 9.581 million tons. For a wet-process power generation zinc plant with an annual output of 100,000 tons, if the zinc concentrate contains 8% iron, the annual output of jarosite is about 53,000 tons. Generally, a slag yard is built nearby to stockpile, which not only takes up precious land resources, and because of the poor stability of the jarosite slag (pH=1.5-2.5 that exists stably), the storage property is not good, and the heavy metals in the jarosite slag, such as Zn, Cu, Cd, Pb, Ag and Sb, etc., Under natural storage conditions, it will continue to dissolve and pollute groundwater and soil [Chen Yongming, Tang Motang, Vol. 19, No...

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Problems solved by technology

For a wet-process power generation zinc plant with an annual output of 100,000 tons, if the zinc concentrate contains 8% iron, the annual output of jarosite is about 53,000 tons. Generally, a slag yard is built nearby to stockpile, which not only takes up precious land resources, and because of the poor stability of the jarosite slag (pH=1.5-2.5 that exists stably), the storage property is not good, and the heavy metals in the jarosite slag, such as Zn, Cu, Cd, Pb, Ag and Sb, etc., Under natural storage conditions, it will continue to dissolve and pollute groundwater and soil [Chen Yongming, Tang Motang, Vol. 19, No. 7, Journal of Nonferrous Metals, Yang Shenghai, et al. New process for decomposing indium-containing ferrite slag with NaOH [J]. China Nonferrous Metals Acta Metall Sinica, 2009, 19(7): 1322-1331; Hou Xiaoqiang, Zheng Xutao, Guo Congsheng, et al. Effects of extreme environments on the solidified body of alum slag cement[J]. Nonferrous Metal Science and Engineering, 2014,5(3) :56-58]

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