The invention belongs to the technical field of methods for determining lead content in ore and in particular relates to a method for determining lead content in multi-metal ore The method comprisesthe following steps: removing silicon with ammonium fluoride, dissolving a sample with a saturated nitrate-potassium chlorate solution, precipitating lead with sulfuric acid, eliminating arsenic, antimony and tin with hydrobromic acid, filtering to separate lead sulfate from partial interfering ions of copper, iron and zinc, dissolving the precipitate with an acetic acid-sodium acetate buffer solution, titrating with an EDTA (Ethylene Diamine Tetraacetic Acid) standard solution, concentrating the filtrate, determining the lead content in an acidic medium by using an atomic absorption spectrometer, adding results obtained during EDTA titration and atomic absorption spectrometry to obtain the total content of lead in the ore Aiming at determination of the lead content in the multi-metal ore, interference can be effectively eliminated, lead content loss is avoided, and the experimental accuracy is improved

Method for determining lead content in multi-metal ore

The invention relates to a mass concentration determination method of easily released cyanide in thiocyanate-containing water and belongs to a mass concentration determination method of easily released cyanide in thiocyanate-containing water. the method comprises the following steps: carrying out primary distillation by the use of zinc nitrate and tartaric acid, transferring a distillate obtainedby the primary distillation into a distillation flask, supplementing water, adding zinc nitrate and tartaric acid to conduct secondary distillation treatment, collecting a distillate obtained by the secondary distillation, and measuring by an isonicotinic acid-pyrazolone spectrophotometric method. According to the invention, the interference of thiocyanate is eliminated through the twice distillation method, a reasonable mode is selected to eliminate the interference of thiocyanide, and content of easily released cyanide is accurately measured.

Mass concentration determination method of easily released cyanide in thiocyanate-containing water

The invention relates to a method for determining easy-to-release cyanide in sulfide-containing based cyanide-containing solid waste, and belongs to the technical field of determination of easy-to-release cyanide in solid waste. The method comprises the following steps: selecting sampling weight, adopting ethanol as a dispersing agent and adding distilled water to further increase dispersity of the cyanide-containing solid waste; using zinc nitrate and tartaric acid as pre-distillation reagents for primary distillation, performing secondary distillation according to a determination method of total cyanide, and adding silver nitrate as a masking agent to remove sulfide, wherein determined cyanogen is easy-to-release cyanogen in the sample; performing determination with a silver nitrate titration method when the content of cyanide in the sample is larger than 100 mg/kg, and performing determination with isonicotinic acid-pyrazolone spectrophotometry when the content of cyanide in the sample is smaller than 100 mg/kg. The content of the easy-to-release cyanide in the sulfide-containing based cyanide-containing solid waste can be determined accurately, and sulfide interference is removed by adopting ethanol as the dispersing agent and combining the masking agent by means of two-time distillation.

Method for determining easy-to-release cyanide in sulfide-containing based cyanide-containing solid waste

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.

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

The invention relates to a determination method for total cyanide in cyanogen-containing solid wastes and belongs to the technical field of determination of the total cyanide in the solid wastes. Thedetermination method comprises the following steps: reasonably weighing the cyanogen-containing solid wastes; taking ethanol as a dispersant and adding distilled water to further improve the dispersity of the cyanogen-containing solid wastes; adding disodium EDTA (Ethylene Diamine Tetraacetate) and phosphoric acid as a pre-distillation reagent and carrying out distillation; taking a sodium hydroxide solution as an absorption solution for absorbing the cyanide; when the content of the cyanide is greater than 50mg/kg, determining by utilizing a silver nitrate titration method; when the content is less than 50mg/kg, determining by utilizing an isonicotinic acid-pyrazolone spectrophotometric method. According to the method provided by the invention, the content of the cyanide in the solid wastes can be accurately determined and the ethanol is successfully found and used as the dispersant, so that the wrapping of the solid wastes on the cyanide is solved and all the cyanide is released; theethanol has no influences on the determination of the total cyanide; finally, the disodium EDTA and the phosphoric acid are selected and used as the pre-distillation reagent, so that the content of the total cyanide in the solid wastes is accurately determined.

Determination method for total cyanide in cyanogen-containing solid wastes

The invention relates to a method for rapidly determining total cyanides in cyanide-containing ore pulp, belonging to methods for rapidly determining the total cyanides in the cyanide-containing ore pulp in a cyanidation technology of the gold industry. The method comprises the steps of pretreating ore pulp by using methyl alcohol, shaking well, then adding a copper sulfate solution and a sodium metabisulfite solution, adding a right amount of silver nitrate solution and lead acetate solution, adding ethylene diamine tetraacetic acid (EDTA) and a phosphoric acid solution, distilling in a distillation flask, flushing a distillate guide tube with a small amount of water, taking out a receiving flask, diluting distillate to a marked line with water, and determining the distillate by using a silver nitrate titration method or an isonicotinic acid-pyrazolone spectrophotometric method. The method has the advnatazges that a gap in the determination of the total cyanides in the ore pulp is filled; copper sulfate and sodium metabisulfite are selected as masking agents, so that the interference of thiocyanides and sulphides can be eliminated, and the monitoring for cyanides in a gold carbonitriding and leaching technology is accurately guided; used time is short, filtration is not needed, the influence of the ore pulp on adsorption of the cyanides is avoided, and the working efficiency is improved.

Method for rapidly determining total cyanides in cyanide-containing ore pulp

The invention belongs to the technical field of a lead content determination method, and particularly relates to a method for simply and efficiently determining a content of lead in gold concentrate. The method comprises the following steps: dissolving a test sample by utilizing nitric acid-potassium chlorate solution, enabling lead in a sulfuric acid medium to form lead sulfate precipitates, filtering, dissolving the precipitates, i.e., lead sulfate on filter paper by using acetic acid-sodium acetate buffer solution, adopting an xylenol orange solution as an indicator under the condition that the PH value is 5.0 to 6.0, titrating by using a EDTA standard titration solution, and calculating the content of lead in the precipitates according to a volume of the consumed EDTA standard solution; collecting filtrate, and determining the content of the lead in the filtrate by virtue of atomic absorption; and finally summing the lead content in the filtrate and the lead content in the precipitates, thus obtaining the lead content in ores. By adopting the method, the problem that the result is inaccurate due to the loss of lead in the filtrate can be solved, the problem that an experimental method is difficult to select for an unknown sample can be solved, the experiment accuracy can be improved, the experimental procedures can be simplified, the operation is convenient, the mass operation of the sample can be realized, and the working efficiency can be improved.

Jiang Ying

Papers

Method for rapidly determining total cyanides in cyanide-containing ore pulp

Method for simply and efficiently determining content of lead in gold concentrate