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A method for multi-cycle selective leaching of copper, zinc and nickel in copper smelting wastewater sludge
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A technology for wastewater sludge and copper smelting, which is applied in the direction of improving process efficiency, can solve the problems of small concentration difference, low valence metal concentration, and inability to directly enter conventional electrolysis, etc., and achieves the effect of simple method and good promotion prospects.
Active Publication Date: 2018-02-06
有研资源环境技术研究院(北京)有限公司
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However, since the grades of metals such as copper, zinc, and nickel in common smelting sludge are generally low, the concentration of each valuable metal in the obtained leachate is low, and in many cases due to the complexity of the sludge, even after conventional selective leaching, the concentration difference between copper and zinc-nickel is still small and cannot directly enter conventional electrolysis
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Embodiment 1
[0022] The copper smelting sludge sample 1 was selectively leached by the method of the present invention, and the types and contents of metals in the sample 1 are shown in Table 1. process such as figure 1 As shown, the specific steps are as follows:
[0023] (1) Take 20g of copper smelting wastewater sludge sample 1 and place it in a leaching container, add 160mL of sulfuric acid with a concentration of 0.06g / mL, stir and mix with the sludge through an agitator, monitor the pH value of the leachate during the leaching process, and make The temperature is maintained at 5.4, and the leaching operation lasts for 2 hours; after the leaching is completed, the solid-liquid separation is carried out, and the leaching solution containing zinc and nickel is collected;
[0024] (2) Put the leaching residue from step (1) in the leaching container, take 160mL of sulfuric acid with a concentration of 0.12g / mL and stir and mix the leaching residue, monitor the pH of the leaching solution...
Embodiment 2
[0033] The copper smelting sludge sample 2 was selectively leached by the method of the present invention, and the types and contents of metals in the sample 2 are shown in Table 2.
[0034] process such as figure 1 As shown, the specific steps are as follows:
[0035] (1) Take 40g of copper smelting wastewater sludge sample 2 and place it in the leaching container, add 240mL of sulfuric acid with a concentration of 0.05g / mL, stir and mix with the sludge through an agitator, monitor the pH value of the leachate during the leaching process, and make The temperature is maintained at 5.6, and the leaching operation lasts for 2 hours; after the leaching is completed, the solid and liquid are separated, and the leaching solution containing zinc and nickel is collected;
[0036](2) Put the leaching residue of step (1) in the leaching container, take 240mL of sulfuric acid with a concentration of 0.14g / mL and stir and mix the leaching residue, monitor the pH of the leaching solution...
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Abstract
The invention provides a method for multicycle selective leaching of copper, zinc and nickel from sludge in waste water produced by copper smelting. The method comprises the following steps: carrying out 1-I extraction on the sludge by using low-concentration sulfuric acid, wherein the pH value of leachate is 5.2 to 6, zinc and nickel are leached out and copper leaves in leaching residues; carrying out 1-II extraction on the leaching residues obtained in the previous step by using high-concentration sulfuric acid and controlling the pH value of leachate to be less than 1 so as to leach out all the rest leachable metal in the residue; subjecting newly-produced sludge to 2-I extraction with the leachate obtained after 1-II extraction and monitoring and controlling the pH value of leachate to be 5.2 to 6, wherein copper settles down and is enriched in leaching residues; carrying out 2-II extraction on the leaching residues obtained in the previous step by using high-concentration sulfuric acid; and as the grade of copper in the leaching residues reaches a predetermined value after X cycles, monitoring and controlling the pH value of X-II leachate to be 3 to 5, wherein obtained leachate contains high-concentration copper and low-concentration zinc and nickel. According to the method, optimal process conditions for cycles can be obtained only through limited experiments; and the method is simple and has good promotion prospects.
Description
technical field [0001] The invention belongs to the technical field of sludge resource treatment, and in particular relates to a method for obtaining a high-concentration copper solution from copper smelting wastewater sludge. Background technique [0002] my country is a major producer of copper. In 2013, the output of refined copper in my country was 6.85 million tons. Copper production is mainly based on pyrometallurgy, and a large amount of wastewater containing heavy metals will be generated in the process of copper pyrometallurgy. Enterprises generally use flocculation and sedimentation methods to treat heavy metal wastewater, thereby transferring heavy metals in wastewater to sludge. This leads to a large amount of sludge containing heavy metals such as Cu, Zn, Ni, Cd, As, Cr, etc. According to statistics, during the treatment of smelting wastewater, an average of 1 ton of wastewater will produce 3 to 4 kg of sludge. The waste water sludge produced by the smelting en...
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