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Determination method of ammonia nitrogen in gold mine cyanide-containing waste water

A measurement method, a technology of cyanide wastewater, applied in the direction of material analysis by observing the influence of chemical indicators, and analysis by making materials undergo chemical reactions.

Inactive Publication Date: 2015-08-26
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 methods for measuring ammonia nitrogen in gold mines, and provides a method for measuring ammonia nitrogen which has the advantages of obvious effect, accurate measurement results, simple operation method, and easy handling.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific example 1

[0033] Use ammonium chloride (premium pure) to prepare a 10mg / L ammonia nitrogen aqueous solution, add a certain quality of surfactant (No. 2 oil, xanthate, etc.) Add a few glass beads and a few drops of defoamer GC-2 to the flask. Add 50ml of boric acid solution into the receiving bottle (500ml beaker) as the absorbing liquid; the upper end of the distillate conduit is connected to the outlet of the condenser tube, and the lower end is inserted into the absorbing liquid of the receiving bottle, and the connection is checked to make it tight; add to the Kjeldahl flask Add a few drops of bromothymol blue indicator solution, add 0.25g of light magnesium oxide, immediately connect the nitrogen bulb and condenser, and heat for distillation; stop the distillation when the solution in the receiving bottle is nearly 190mL, dilute to 200ml with a small amount of ammonia-free water, and use Acid titration was used to measure the slip-out liquid. Six groups of experiments determined th...

specific example 2

[0035] Cyanide-containing wastewater from a gold mine, pH 8.5, CN T 200mg / L, SCN — 83.45mg / L, Cu 2+ 6.39mg / L, Zn 2+ is 24.25mg / L, COD is 275.45mg / L, NH 3 -N is 35mg / L (estimated), 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 250mL cyanide-containing wastewater into 500mL Kjeldahl flasks, add several glass beads and a few drops of defoamer GC-2. Add 50ml of boric acid solution into the receiving bottle (500ml beaker) as the absorbing liquid; the upper end of the distillate conduit is connected to the outlet of the condenser tube, and the lower end is inserted into the absorbing liquid of the receiving bottle, and the connection is checked to make it tight; add to the Kjeldahl flask Add a few drops of bromothymol blue indicator solution, add 0.25g of light magnesium oxide, immediately connect the nitrogen bulb and condenser, and heat for distillation; stop the distillation whe...

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PUM

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Abstract

The invention discloses a determination method of ammonia nitrogen in gold mine cyanide-containing waste water. According to the characteristics that a surfactant exists in the gold mine cyanide-containing waste water and a large number of bubbles can be generated by heating distillation under an alkaline condition, the determination method comprises the steps of adding a defoamer GC-2 in a cyanide-containing waste water sample to inhibit the activity of the surfactant in the waste water, so that the water sample cannot generate bubbles in the distillation process; adding magnesium oxide to the water sample; performing heating distillation in a medium with the pH of 6.0-7.6; releasing the ammonia nitrogen, using a boric acid solution to absorb the ammonia nitrogen, and using an acid standard solution to titrate the content of the ammonia nitrogen. Methyl red-methylene blue is taken as an indicator till the solution becomes into lavender from green. The method has the advantages of being obvious in effect, accurate in measuring result, simple in operation method and easy to grasp, and has a wide application prospect.

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 ammonia nitrogen in cyanide-containing wastewater from gold mines. 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. The current treatment methods for cyanide-containing wastewater are mainly oxidative destruction, which oxidizes cyanide into other substances with lower toxicity, but this may lead to excessive ammonia nitrogen in wastewater. Therefore, attention must be paid to the content ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N21/78
Inventor 兰馨辉叶锦娟迟崇哲
Owner CHANGCHUN GOLD RES INST