A method for removing iron and cyanide by mixing copper-containing wastewater and cyanide-containing wastewater
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A technology for removing iron, cyanide and cyanide wastewater, applied in the fields of environmental protection and metallurgy, can solve problems such as failure to meet discharge standards, and achieve the effect of low cost
Active Publication Date: 2022-07-15
ZIJIN MINING GROUP +1
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[0006] The iron blue method to treat cyanide-containing wastewater can reduce the cyanide content in cyanide-containing wastewater to below 10mg / L, but it has not reached the discharge standard of 0.5mg / L
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Embodiment 1
[0027] The present embodiment provides a method for removing iron and cyanide by mixing copper-containing wastewater and cyanide-containing wastewater, which specifically includes the following steps:
[0028] S1. In a closed reaction tank, sulfuric acid, Cu 2+ Ion, Fe 3+ Ions and Zn 2+ ionic copper-containing acidic wastewater with sodium hydroxide and CN - The ionized cyanide-containing wastewater is mixed for neutralization, CN - with Fe 3+ The mass ratio is not greater than 2.1, and ferrous sulfate is added, CN - with Fe 2+ The mass ratio is not greater than 2.8, and the pH is controlled between 3.0-5.5; the reaction is carried out for 1h;
[0029] Specifically, pH can be monitored by an online pH detector;
[0030] In addition, hydrogen cyanide can be monitored online with an online hydrogen cyanide monitor.
[0031] S2, press 2g / m to the post-reaction liquid obtained in step S1 3 The proportion of polyacrylamide with a mass concentration of 1‰ was added to carry...
Embodiment 2
[0036] In a gold mine in Fujian, the copper-containing acid wastewater contains about 10g / L of sulfuric acid, 80-100mg / L of copper ions, and 0.25-0.35g / L of zinc ions. The total iron content (mainly ferric ions) varies with seasons. Fluctuates between 8-12g / L, and iron is mainly composed of Fe in copper-containing acidic wastewater 2 (SO 4 ) 3 form exists. The cyanide content in the cyanide-containing wastewater is about 200mg / L, and the sodium hydroxide content is about 2g / L.
[0037] (1) Analysis of the existing process
[0038] The existing treatment process of copper-containing acid wastewater is two-stage neutralization, and the daily water treatment volume is 4000m3 3 In terms of / d, the cost of water treatment per ton is 20-25 yuan. Cyanide-containing wastewater according to the treatment volume of 20000m 3 / d calculation, the processing cost is 20-25 yuan / ton.
[0039] Specifically, the existing two-stage neutralization treatment process reaction principle of ...
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Abstract
The invention discloses a method for removing iron and cyanide by mixing copper-containing wastewater and cyanide-containing wastewater, which specifically includes the following steps: mixing copper-containing acid wastewater and cyanide-containing wastewater, and adding an appropriate amount of ferrous sulfate; Polyacrylamide is added to carry out flocculation and sedimentation, the supernatant is adsorbed with resin, underflow filtration, and the filter residue is washed; S3, add dilute sulfuric acid to the filter residue and inflate, add potassium ferrocyanide and the surfactant zinc naphthalate to the solution after dissolution, Generate china blue dye; S4, for the filtrate, use resin to absorb copper and resin to absorb zinc, and use sulfuric acid solution to desorb copper and zinc respectively; S5, for the liquid after adsorption, adjust its pH to 6-7, pass chlorine dioxide The remaining total cyanide content was reduced to 0.5 mg / L before efflux. The method of the invention has low cost, can produce products with sales value, and can effectively recover metal ions in copper-containing acid wastewater and remove cyanide in cyanide-containing wastewater.
Description
technical field [0001] The invention relates to the technical fields of metallurgy and environmental protection, in particular to a method for removing iron and cyanide by mixing copper-containing wastewater and cyanide-containing wastewater. Background technique [0002] The common treatment method of copper-containing acid wastewater in mines is lime neutralization, but metal ions cannot be recovered well. Neutralized slag is generally stored as waste. At present, in order to recover metal ions in copper-containing acidic wastewater, iron powder replacement method, membrane treatment technology, ion exchange method, chemical precipitation method and other methods have been used for treatment. However, due to the high sulfur content of mine ore, the acidity of copper-containing acid wastewater is high (about 10g / L), iron is high (8-12g / L), copper content is low (80-100mg / L), and the properties of copper and iron are similar. , increasing the difficulty of copper recycling...
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