Measurement method for total cyanide in solid wastes containing thiocyanate and sulfide

A technology containing thiocyanate and solid waste, applied in material analysis, measuring device, preparation of test samples by observing the effect on chemical indicators, etc., can solve the problems of inaccurate measurement results and so on

Inactive Publication Date: 2018-07-06
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The invention provides a method for determining total cyanide in solid waste containing thiocyanate and sul

Method used

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  • Measurement method for total cyanide in solid wastes containing thiocyanate and sulfide
  • Measurement method for total cyanide in solid wastes containing thiocyanate and sulfide
  • Measurement method for total cyanide in solid wastes containing thiocyanate and sulfide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] (1) Use a balance to weigh 1.00g of thiocyanate-containing cyanide-containing solid waste with a dry weight, transfer the sample to a distillation flask with distilled water, set the volume to 250mL with distilled water, add 5mL of ethanol, shake the sample, and add 10mL Silver nitrate solution with a concentration of 0.100mol / L, shake well, add a few glass beads into the distillation bottle, add 10mL EDTA-disodium solution with a concentration of 100g / L and 10mL phosphoric acid solution, shake well, connect the distillation device, Add 10mL sodium hydroxide solution with a concentration of 20g / L into the 100mL receiving bottle as the absorption liquid. , the lower end of the distillate conduit should be inserted under the liquid surface of the absorption liquid to make the absorption complete;

[0052] (2) Stop distillation when the volume of the sample in the 100mL receiving bottle is 90mL, rinse the distillate conduit with distilled water, add the flushed liquid into...

Embodiment 2

[0077] (1) Use a balance to weigh 1.25g of cyanide-containing solid waste containing sulfide, transfer the sample to a distillation flask with distilled water, use distilled water to set the volume to 250mL, add 5mL of ethanol, shake the sample, and add 10mL of concentration 0.100mol / L silver nitrate solution, shake well, add a few glass beads into the distillation bottle, add 12.5mL EDTA-disodium solution with a concentration of 100g / L and 12.5mL phosphoric acid solution, shake well, connect the distillation device, Add 10mL of sodium hydroxide solution with a concentration of 20g / L into the 100mL receiving bottle as the absorption liquid. , the lower end of the distillate conduit should be inserted under the liquid surface of the absorption liquid to make the absorption complete;

[0078] (2) Stop distillation when the sample volume in the 100mL receiving bottle is 80mL, rinse the distillate conduit with distilled water, add the flushed liquid into the receiving bottle, take...

Embodiment 3

[0107] (1) Weigh 1.50 g of cyanide-containing solid waste containing sulfide and thiocyanate with a balance, transfer the sample to a distillation flask with distilled water, set the volume to 250 mL with distilled water, add 5 mL of ethanol, and shake the sample Mix well, add 10mL silver nitrate solution with a concentration of 0.100mol / L, shake well, add a few glass beads into the distillation bottle, add 15mL EDTA-disodium solution with a concentration of 100g / L and 15mL phosphoric acid solution, shake well, and distill Connect the device, add 10mL sodium hydroxide solution with a concentration of 20g / L into the 100mL receiving bottle as the absorption liquid, connect the outlet of the condenser tube at the upper end of the distillate conduit, insert the lower end into the absorption liquid of the receiving bottle, check the connection part, make it Tight, when distilling, the lower end of the distillate conduit should be inserted under the liquid surface of the absorbing li...

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Abstract

The invention relates to a measurement method for total cyanide in solid wastes containing thiocyanate and sulfide, and belongs to the technical field of total cyanide measurement in solid wastes. Themeasurement method comprises the following steps: selecting a reasonable weighing sample, using ethyl alcohol as a dispersing agent, adding distilled water to further increase the dispersibility of the cyanogens-containing solid wastes, adding silver nitrate to shelter the interference of thiocyanate and sulfide, and adopting a sodium hydroxide solution as absorption liquid. When the content of the cyanide inside a sample is greater than 100 mg/kg, silver nitrate titration is used for measurement, and when the content of the cyanide inside the sample is greater than 100 mg/kg, isonicotinic acid-pyrazolone spectrophotometry is used for measurement. The ethyl alcohol is successfully found as the dispersing agent, and the silver nitrate is successfully found as a masking agent for masking thiocyanate and sulfide. According to the method, the content of total cyanide in the cyanogens-containing solid wastes containing thiocyanate and sulfide can be measured accurately.

Description

technical field [0001] The invention belongs to the technical field of measuring total cyanide in solid waste, in particular to a method for measuring total cyanide in cyanide-containing solid waste containing thiocyanate and sulfide. Background technique [0002] In the new environmental protection law, cyanide-containing solid waste is listed as a hazardous waste list. Cyanide is a highly toxic substance, and its accurate detection is very important. For example, in the gold production process, the cyanide gold leaching process is one of the very important means. The solid waste produced by the cyanidation gold leaching process contains cyanide, and most of them also contain relatively high thiocyanate and sulfide. The existence of thiocyanate directly affects the accurate determination of total cyanide, because total cyanide During the distillation process of compound determination, part of thiocyanate will be distilled out and enter into the absorbing liquid. During colo...

Claims

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Application Information

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IPC IPC(8): G01N31/16G01N21/31G01N21/78G01N1/38G01N1/28
CPCG01N1/2853G01N1/38G01N21/31G01N21/78G01N31/16G01N2021/3196
Inventor 葛仲义陈永红张灵芝王菊孟宪伟芦新根
Owner CHANGCHUN GOLD RES INST
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