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Method for removing cyanide, thiocyanate, COD and arsenic in waste liquid

A technology of thiocyanate and cyanide, applied in the field of thiocyanate, removal of cyanide, COD and arsenic in waste liquid, can solve the problem of inability to treat cyanide in depth

Active Publication Date: 2012-08-15
CHANGCHUN GOLD RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Within the range of pH value controlled by sections, there is no need to strictly require the concentration of ozone generation and mass flow rate, which can solve the problem that a single process cannot deeply treat cyanide, thiocyanate, COD, and arsenic in waste liquid, and reduce the process equipment. Cost and operational complexity, reducing environmental pollution

Method used

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  • Method for removing cyanide, thiocyanate, COD and arsenic in waste liquid
  • Method for removing cyanide, thiocyanate, COD and arsenic in waste liquid
  • Method for removing cyanide, thiocyanate, COD and arsenic in waste liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0115] The composition of a gold concentrate cyanidation leaching residue leaching waste liquid is shown in Table 3

[0116] Table 3 Composition of a gold concentrate cyanidation leaching residue leaching waste liquid

[0117] Unit: mg / L, pH dimensionless

[0118]

[0119] From the composition of the above wastewater quality, it can be seen that the main pollutants of wastewater are CN T 、SCN - , As, COD, where SCN - The proportion of COD is relatively high, so the reaction process is mainly for the analysis and determination of the above four pollutants. see figure 1 with figure 2 Shown:

[0120] (1) Pretreatment section: After the waste liquid to be treated passes through the grit chamber to settle the solid suspended matter in the waste liquid, it enters the equalization tank.

[0121](2) Continuous treatment: Turn on the upper liquid pump to extract the liquid to be treated from the equalizing tank at the maximum flow rate, and pour it into the oxidation reactor...

Embodiment 2

[0130] The composition of a gold ore cyanidation leaching cycle barren solution, see Table 5

[0131] Table 5 Summary of composition of barren liquid sampling and analysis in cyanidation leaching system of a factory

[0132] Unit: mg / L, pH dimensionless

[0133] serial number CN T SCN - Cu Pb Fe Zn As COD pH 1 343.82 1591.25 0.0167 micro 0.0003 micro - 1703.14 12 2 315.85 1320.34 0.0172 micro 0.0003 micro - 1540.92 12 3 341.75 1569.43 0.0166 micro 0.0003 micro - 1681.10 12 4 310.68 1317.83 0.0167 micro 0.0003 micro - 1529.82 12 5 311.54 1318.24 0.0152 micro 0.0003 micro - 1549.97 12 6 310.68 1320.97 0.0167 micro 0.0003 micro - 1558.86 12

[0134] From the composition of the above wastewater quality, it can be seen that the main pollutants of wastewater are CN ...

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PUM

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Abstract

The invention discloses a method for removing cyanide, thiocyanate, COD and arsenic in waste liquid, comprising the following steps: the cyanide, the thiocyanate, the COD and the arsenic in the waste liquid are deeply treated by utilizing ozonized gas, a mode with continuous treatment and direct discharge can be adopted, also a mode with batch treatment and intermittent discharge can be adopted, and the implementation process of the method is easy to control; in the range of the pH value with sectioned control, the generation concentration and mass velocity of ozone do not need to be requiredstrictly, the problem that single technology can not treat the cyanide, the thiocyanate, the COD and the arsenic in the waste liquid deeply can be solved, the cost and the operation complexity of technological equipment are reduced, and the environmental pollution is reduced; solid suspensions (SS) in the treated waste liquid is removed by settlement, and clear liquor is directly discharged outwards or returned to the upstream technology for repeated use; the contents of pollutants in the treated waste liquid are stable, the total content of the cyanide is less than 0.2mg / L(waste water); the content of the thiocyanate is less than 5mg / L(waste water); the total content of the COD is less than 30mg / L; the total content of the arsenic is less than 0.5mg / L(waste water), and no secondary pollutants are generated in the reaction process.

Description

technical field [0001] The invention relates to the field of water treatment and environmental protection, in particular to a method for removing cyanide, thiocyanate, COD and arsenic in waste liquid. technical background [0002] In industrial production, the cyanide method has always been an important means of gold and silver wet extraction, so a certain amount of waste liquid containing cyanide and cyanide derivatives must be discharged during the production process, which contains various types of waste liquid depending on the nature of the ore Free cyanide with different concentrations and simple metal cyanide complexes, refractory metal cyanide complexes, and cyanide derivatives such as cyanate, thiocyanate, and cyanogen chloride, are suitable for refractory gold mines. The cyanidation waste liquid after biological pre-oxidation, autoclave oxidation, and oxidative roasting contains highly toxic water-soluble trivalent arsenic ions, and the environmental protection prob...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F101/18C02F101/16
Inventor 李延吉李哲浩陈民友降向正
Owner CHANGCHUN GOLD RES INST
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