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Measuring method for cyanides in cyanide-containing wastewater of gold mine

A measurement method, a technology of cyanide wastewater, which is applied in the direction of material analysis by observing the influence on chemical indicators, and analysis by making materials react chemically.

Inactive Publication Date: 2015-08-12
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention aims at the above-mentioned problems existing in the existing gold mine cyanide determination method, and provides a cyanide determination method with the advantages of obvious effect, accurate measurement result, simple operation method, and easy handling.

Method used

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Examples

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Effect test

specific example 1

[0034] Use potassium cyanide (premium pure) to prepare a cyanide aqueous solution with a concentration of 100mg / L, add a certain quality of surfactant (No. 2 oil, xanthate, etc.) to the cyanide aqueous solution, and measure six groups of 200mL cyanide aqueous solutions Transfer to a 500mL distillation bottle, add a few glass beads and a few drops of defoamer GC-1. Add 10mL of sodium hydroxide solution with a concentration of 2% into the receiving bottle as the absorption liquid; the distillate conduit is terminated with the outlet of the condenser tube, and the lower end is inserted into the absorption liquid of the receiving bottle, and the connection is checked to make it tight; the concentration of 10mL is Add 10% EDTA solution into the distillation bottle, add 7-8 drops of methyl orange indicator, quickly add 10mL phosphoric acid solution and immediately cover the bottle stopper to keep the solution in the bottle red, open the condensed water distillate at a speed of 2-4mL / ...

specific example 2

[0036] Cyanide-containing wastewater from a gold mine, pH 8.5, CN T 200mg / L (estimated), SCN — 83.45mg / L, Cu 2+ 6.39mg / L, Zn 2+ is 24.25mg / L, COD is 275.45mg / L, NH 3 -N is 32.74mg / L, in addition, it also contains a large amount of surfactants such as No. 2 oil and trace amounts of other heavy metal ions. Measure six groups of 200mL cyanide-containing wastewater and transfer them into 500mL distillation bottles, add several glass beads and a few drops of defoamer GC-1. Add 10mL of sodium hydroxide solution with a concentration of 2% into the receiving bottle as the absorption liquid; the distillate conduit is terminated with the outlet of the condenser tube, and the lower end is inserted into the absorption liquid of the receiving bottle, and the connection is checked to make it tight; the concentration of 10mL is Add 10% EDTA solution into the distillation bottle, add 7-8 drops of methyl orange indicator, quickly add 10mL phosphoric acid solution and immediately cover the ...

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Abstract

The invention discloses a measuring method for cyanides in cyanide-containing wastewater of a gold mine. In order to solve the problem that a great number of foams are produced by heating and distilling under an acidic condition, a defoaming agent GC-1 is added into a cyanide-containing wastewater sample to inhibit activities of a surfactant in wastewater, so that the water sample does not produce foams in a distilling process; phosphoric acid and Na2-EDTA are added into the water sample, and heated and distilled in a medium with pH lower than 2, so that cyanide ions are separated from complex cyanide by utilizing the characteristic that the complexing capacity between the metal ions and the EDTA is higher than that between the metal ions and the cyanide ions, the cyanide ions are distilled in the form of hydrogen cyanide, and the content of the cyanide ions is titrated by silver nitrate after the cyanide ions are absorbed by a sodium hydroxide solution. Under an alkaline condition, the cyanide ions act with the silver nitrate to form soluble sliver-cyanogen complex irons (Ag(CN)2<->), and the excessive sliver ions react with 5-(4-dimethylaminobenzylidene)rhodanine indicator liquor, so that the solution is changed into orange red from yellow, thereby ending the measurement. The method has the advantages of obvious effect and accurate measured result, and is simple to operate and easy to grasp.

Description

technical field [0001] The invention relates to a method for measuring pollutants in the fields of analysis, monitoring and environmental protection, in particular to a method for measuring cyanide in gold mine cyanide-containing wastewater. Background technique [0002] Due to the use of cyanide gold extraction process in the production process of gold mines, a large amount of cyanide-containing wastewater will be produced. This part of cyanide-containing wastewater not only contains a certain amount of highly toxic cyanide, but also contains thiocyanate, surfactants and copper Heavy metal ions such as zinc, lead, etc., if not effectively treated, will cause major environmental hazards. Accurate determination of the concentration of various pollutants in cyanide-containing wastewater is the first prerequisite for its treatment. At present, the national standard methods for the determination of cyanide in cyanide-containing wastewater mainly include silver nitrate titration...

Claims

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Application Information

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IPC IPC(8): G01N21/78
Inventor 兰馨辉叶锦娟迟崇哲
Owner CHANGCHUN GOLD RES INST
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