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Method for treating cyanide wastewater containing iron and zinc elements

A treatment method, cyanide technology, applied in metallurgical wastewater treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problem that thiocyanate heavy metal ions are not effectively removed, cyanide and metal ions are difficult to reach, and cannot Wastewater is stable and up to standard discharge and other issues, achieving good solid-liquid separation effect, good economic benefits, and low cost

Inactive Publication Date: 2019-03-29
GUANGXI SENHE HIGH TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there are many kinds of treatment methods for cyanide. Generally speaking, they can be divided into two categories. One is destructive treatment methods, such as Inco method, hypochlorite oxidation method, chlorine dioxide oxidation method, Fenton method, etc. Oxidation method, ozone oxidation method, etc.; this method has high cost and complicated process, which is not conducive to the comprehensive utilization of cyanide in high-concentration cyanidation gold extraction wastewater, and due to the existence of strong ferricyanide complex ions, often It will make it difficult to reach the cyanide and metal ions in the treated wastewater
The other is a non-destructive treatment method, such as the acidification recovery method. Although this method can recover a certain amount of cyanide, due to the incomplete recovery of cyanide, a large amount of cyanide will remain in the wastewater, while thiocyanate and some heavy metals ions are not effectively removed
[0003] In summary, although there are many methods for the treatment of cyanide wastewater, each method has its own advantages and disadvantages. If a single method is used, the residual cyanide concentration in the treated wastewater generally reaches ten milligrams. More than every liter, it is often impossible to make the treated wastewater discharge stably up to the standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A treatment method for cyanide wastewater containing iron and zinc elements, comprising the steps of:

[0028] (1) This embodiment treats cyanide-containing wastewater containing iron and zinc elements, and CN in the cyanide-containing wastewater t 2816.8mg / L, Zn689.1mg / L, Fe 358.7mg / L, CN - 1243.4mg / L, PH=11.0, get 2500mL of cyanide-containing waste water, add the solution 900mL that contains ferrous sulfate 200g / L and 0.1% sodium sulfite, adjust waste water pH to 6 with concentration 3% sulfuric acid, add flocculant 3g again, described The flocculant is composed of polyacrylamide, chitosan and octaaminophenylsilsesquioxane with a mass ratio of 3:2:1, stirred for 60 minutes, filtered, and the filtrate was taken;

[0029] (2) Add 0.1g of copper sulfate and 5g of modified diatomaceous earth to the filtrate, stir for 60 minutes, and filter. The resulting filter residue is then acidified with sulfuric acid and blown off. After recovering cyanide, the remaining waste resid...

Embodiment 2

[0034] A treatment method for cyanide wastewater containing iron and zinc elements, comprising the steps of:

[0035] (1) This embodiment treats cyanide-containing wastewater containing iron and zinc elements, and CN in the cyanide-containing wastewater t 542.8mg / L, Zn113.2mg / L, Fe 87.6mg / lL, CN - 225.7mg / L, PH=10.0, get 2500mL of cyanide-containing wastewater, add 20mL of ferrous sulfate 200g / L solution, adjust the wastewater pH to 6.5 with a concentration of 3% sulfuric acid, then add 5g of flocculant, the flocculant Composed of polyacrylamide, chitosan and octaaminophenylsilsesquioxane with a mass ratio of 2:2:1, stirred for 30 minutes, filtered, and the filtrate was taken;

[0036] (2) Add 0.2g of copper sulfate and 8g of modified zeolite to the filtrate, stir for 30 minutes, and filter. The obtained filter residue is then acidified with sulfuric acid and blown off. After recovering cyanide, the remaining waste residue is piled up or copper is recovered. The preparation...

Embodiment 3

[0041] A treatment method for cyanide wastewater containing iron and zinc elements, comprising the steps of:

[0042] (1) This embodiment treats cyanide-containing wastewater containing iron and zinc elements, and CN in the cyanide-containing wastewater t 1239.6mg / L, Zn257.1mg / L, Fe 108.2mg / L, CN - 712.9mg / L, PH=11.0, take 2500mL of cyanide-containing waste water, add and contain ferrous sulfate 200g / L solution 18mL, adjust waste water pH to 5.5 with concentration 5% hydrochloric acid, add flocculant 4g again, described flocculant is by mass ratio It is composed of polyacrylamide, chitosan and octaaminophenylsilsesquioxane of 3:1:1, stirred for 120min, filtered, and the filtrate was taken;

[0043](2) Add 0.05g of copper sulfate and 10g of modified diatomaceous earth to the filtrate, stir for 30 minutes, and filter. The resulting filter residue is then acidified with sulfuric acid and blown off. After recovering cyanide, the remaining waste residue is piled up or copper is r...

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PUM

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Abstract

The invention discloses a method for treating cyanide wastewater containing iron and zinc elements. The method comprises the steps of adding ferrous sulfate with the weight of 7-8 times of that of cyanide weight into the cyanide-containing wastewater containing the iron and zinc elements, adding acid to adjust the pH of the wastewater to 5-6.5, then adding a flocculant and stirring for 0.5-2 h, filtering and taking filtrate; adding copper salt and modified diatomaceous earth or modified zeolite into the filtrate, stirring for 0.5-2 h, filtering, acidifying obtained filter residues with sulfuric acid, performing air stripping, recovering cyanide, and then piling up remaining waste residues or recycling copper; and adjusting the pH of the filtrate to 7.5-8.5, adding a flocculant, stirring, and performing solid-liquid separation so as to discharge the wastewater. The method fully combines ferrous ions and cyanide in the wastewater in a condition of weak acidity and in the presence of reducing substances containing sulfite and the like, so that precipitate and a small amount of residual ferricyanide are generated; by means of a combined action of a small amount of the added copper saltand modified diatomaceous earth or modified zeolite, the purpose of removing the cyanide is achieved by means of solid-liquid separation of generated precipitate; and the total cyanide content in thetreated wastewater can be less than 0.5 mg / L.

Description

technical field [0001] The invention relates to the technical field of metallurgical wastewater treatment, in particular to a treatment method for cyanide wastewater containing iron and zinc elements. Background technique [0002] Gold extraction by cyanidation is currently the main gold smelting method. According to statistics, 80% of the world's gold production is obtained by this process. Cyanide gold extraction will produce a large amount of cyanide-containing wastewater, which is very toxic, and if it is discharged without treatment, it will inevitably cause serious pollution accidents to the environment. All countries have strict control measures for the use and emission of cyanide. At present, the cyanide immersion gold method is still widely used in the gold production industry, and cyanide is also commonly used in the electroplating industry for electroplating operations. At present, there are many kinds of treatment methods for cyanide. Generally speaking, they c...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/16C02F101/18
CPCC02F1/001C02F1/288C02F1/5263C02F1/545C02F1/56C02F1/66C02F1/70C02F9/00C02F2101/18C02F2103/16
Inventor 阙山东刘新
Owner GUANGXI SENHE HIGH TECH CO LTD