Rapid analysis method for concentration of cyanide in cyanide leaching solution of gold ore

Abstract

The invention provides a rapid analysis method for the concentration of cyanide in a cyanide leaching solution of gold ore. The method comprises the following steps: accurately weighing 5.00 to 25.00 mL of the cyanide leaching solution of gold ore and putting the weighed cyanide leaching solution into a bottle with a volume of 100 mL; adjusting a pH value to 10 to 13; adding a quantified and excess standard silver solution, allowing a volume of the added solution to be fixed by using water and carrying out shaking-up; subjecting the obtained solution to dry filtering into a beaker; separately taking obtained filtrate and measuring the concentrations of silver ions in the solution by using atomic absorption spectrometry; and calculating the concentration of cyanide in the cyanide leaching solution according to a formula (I) which satisfies the equation that C<NaCN> = [(C<0>V<0>-C<1> v<1>*10<-6> / M<Ag>)*M<NaCN>] / V. The method provided by the invention omits a distillation apparatus and step, puts an end to generation of hydrogen cyanide, reduces operation dangers, mitigates environmental pollution and simplifies operation steps; only two inorganic reagents are used in the whole analysis process, and rapid determination of the concentration of cyanide in the cyanide leaching solution of gold ore is realized; and the method is applicable to determination of cyanide (in terms of sodium cyanide) with a concentration of 1 mg / L or above in the cyanide leaching solution, and obtained results are good in accuracy and precision.

Description

technical field [0001] The invention relates to a rapid analysis method for cyanide concentration in gold ore cyanide leaching solution, in particular to an analysis method for detecting cyanide concentration in gold ore cyanide leaching solution by adopting a silver cyanide precipitation method. Background technique [0002] The process of extracting gold with cyanide as a leaching solution is called cyanidation gold extraction, which is the main method for extracting gold from ores or concentrates in modern times. In addition to the metal sulfide minerals pyrite, pyrrhotite, chalcopyrite and sphalerite, the cyanide leaching solution of gold ore also contains a certain amount of Fe 2+ 、Cu 2+ , Zn 2+ , S 2- , Fe 3+ Plasma. [0003] The concentration of cyanide in gold ore cyanide leaching solution is an important basis for judging the consumption of sodium cyanide in the process of cyanide leaching gold. For the determination of cyanide concentration, silver nitrate ti...

AI Technical Summary

Problems solved by technology

For the determination of cyanide concentration, silver nitrate titration (sodium cyanide concentration above 5 mg / L) and isonicotinic acid-pyrazolone spectrophotometry (sodium cyanide concentration below 5 mg / L) are commonly used. It is necessary to convert cyanide into hydrogen cyanide first and then absorb it with lye, which requires extremely high airtightness of the distillation device, especially for leaching solutions with high cyanide concentration, there is a risk of hydrogen cyanide leakage due to incomplete absorption of lye Hidden dangers, the operation is more dangerous, and the analysis steps are more cumbersome

In addition, there are many types of reagents used in the two methods, such as pyridine, N, N-dimethylformamide, etc., which are highly toxic, difficult to degrade, and easy to cause environmental pollution.

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