Treatment method of gold extraction cyaniding wastewater containing copper and iron ions with high concentration

A waste water treatment, iron ion technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of high equipment pressure, cyanide consumption, high cost, etc., and reduce the cost of enterprises Low cost, significant economic benefits, and low processing costs

Inactive Publication Date: 2013-09-18
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most smelters implement a closed-circuit circulation system for gold leaching, so when the copper-enriched leaching solution is returned to the gold mine for cyanide leaching, it will cause double consumption of cyanide.
Divalent copper ions will oxidize cyanide ions, and the generated cyanide will volatilize from the solution, while monovalent copper ions will combine with free cyanide to form copper-cyanide complex ions, resulting in a great consumption of cyanide and a decrease in the leaching rate.
However, this method has the characteristics of difficult membrane cleaning and high cost. For large-scale wastewater treatment, the equipment pressure is too high

Method used

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  • Treatment method of gold extraction cyaniding wastewater containing copper and iron ions with high concentration

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] The cyanide-containing wastewater in this example was taken from a 4# thickener in a gold smelter in Henan. The test results of the ion concentration in the wastewater before treatment are shown in Table 1.

[0052] The metal ion content of table 1 stoste

[0053] Metal ion species in wastewater CN - (mg / L) Cu(g / L) Fe(mg / L) Zn(mg / L) Au(mg / L) Ion concentration (mg / L) 760 4.5 62.9 249 0.34

[0054] The specific operation steps are as follows: take 100ml of waste water and put them into six 200ml beakers respectively, add different amounts of zinc sulfate and stir for 1 hour, filter and take the clear liquid and measure the results as follows:

[0055] Table 2. ZnSO 4 Experimental results with addition of on-site wastewater

[0056] The amount of zinc sulfate added (g / 100ml) 0.5 1.5 2.0 3.0 3.5 4.0 Residual copper content in wastewater (g / L) 3.44 1.52 1.13 0.38 0.12 0.04 Amount of remaining gold in wastew...

Embodiment 2

[0066] The wastewater in this example comes from the wastewater of a gold smelter, and the concentration of metal ions before wastewater treatment is shown in Table 4.

[0067] The ion content of table 4 stoste

[0068] Metal ion species in wastewater CN - (mg / L) Cu(g / L) Fe(mg / L) Zn(mg / L) Au(mg / L) Ion concentration (mg / L) 920 2.58 740 1180 0.31

[0069] The operation steps are as follows: each get 100ml waste water and pack into 6 200ml beakers respectively, add different amounts of zinc chloride and stir for 1h, filter and get the clear liquid and measure the results as follows:

[0070] Table 5. Experimental results of adding zinc chloride to field wastewater

[0071] The amount of zinc chloride added (g / 100ml) 1.0 1.5 2.0 2.5 3.0 4.0 Residual copper content in wastewater (g / L) 1.98 1.32 0.75 0.36 0.17 0.021 Amount of remaining gold in wastewater (g / m3) 0.31 0.30 0.32 0.30 0.31 0.31

[0072] It is...

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Abstract

The invention discloses a treatment method of gold extraction cyaniding wastewater containing copper and iron ions with a high concentration. The treatment method comprises the steps of with zinc salt as a precipitator, removing a most part of free cyanogens and copper, iron and zinc ions in a solution, and further recovering residual cyanogens ions and other valuable metal ions in the solution after precipitation by using strong basic resin as an adsorbent to enable the wastewater to be discharged up to the standard. Due to the adoption of the treatment method, cyanide and the valuable metal ions in the gold extraction wastewater are furthest recovered by virtue of the two-step process of precipitation and resin adsorption; and moreover, as the treated wastewater can return to a leaching system or be directly discharged according to the needs, the treatment method is very strong in the flexibility, is low in treatment cost for treating the cyaniding wastewater with higher copper and iron contents and has a remarkable economic benefit.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of industrial waste water, in particular to a method for treating gold-extracting cyanidation waste water containing high-concentration copper and iron ions. Background technique [0002] Cyanide-containing wastewater is a very toxic industrial wastewater. If it is not properly treated and discharged directly, it will pollute the environment, poison organisms, and endanger humans. Industrial cyanide-containing wastewater mainly comes from industries such as metallurgy, petrochemical, electroplating, organic synthesis, printing and dyeing, nitrogen fertilizer and gas. Wastewater has complex components and is difficult to treat. [0003] The cyanide-containing wastewater of the gold smelter, because the associated minerals in the gold ore except chalcopyrite and chrysocolla and other copper ores are easy to form copper cyanide complex ions with cyanide. However, most smelters imp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/20
Inventor 宋永辉屈学化兰新哲党晓娥周军张秋利
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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