The method of determination of noble metals

 

(57) Abstract:

The method of determination of noble metals refers to analytical chemistry. The technical result of the invention is the improvement of expressnet assay analysis and reduction of its cost. From the sample material, crushed to a grain size of 1 mm, are selected analytical sample, mix it with the mixture containing lead oxides, starch, sodium carbonate, desativada sodium tetraborate, sodium nitrate, in an amount calculated by the formulas depending on the composition of the sample. The resulting mixture is melted and then determine the content of noble metals in the reservoir. The mass of the oxides of lead, used as a flux, and starch expect depending on the composition of the sample and the mass of an analytical sample according to the formula

for objects with an oxidizing ability for objects with regenerative ability, where GFL- the mass of the oxides of lead, used as a flux, g; MPbxOyand MPbO - molecular weight (g) used for the analysis of non-stoichiometric lead oxide and lead oxide (II), respectively; W is the weight of the starch, g; , CSCAsCSbthat is , the mass of Koh is th sample sample ,

The invention relates to methods for determination of noble metals and can be used for determination of noble metals in natural and industrial objects except chromite and magnetite ores.

The known method [1, S. 116-142] determination of noble metals, including grinding the sample to a particle size of grain - 0,147 mm, mixing the sample with a mixture containing the following components: quartz (SiO2), crushed glass (xNa2O·yCaO-zSiO2), borax (PA2IN4O7·10H2O), soda (PA2CO3), potash (K2CO3), litharge (b), reducing agents (carbon and other), oxidants (KPO3and NaNO3); melting the mixture and quantitative registration of metals in the water.

This method has the following disadvantages:

- selection or calculation of the charge are time-consuming operations;

is not achieved in most cases, the desired degree of extraction of noble metals (>95%);

- grinding the sample to a particle size of grain - 0,147 mm is a time-consuming operation;

the method is characterized by low expressnet.

Closest to the present invention is a method [2] determine Belgorodenergo and sodium nitrate in the amount calculated by the formulas depending on the composition of the analyzed samples.

This method has the following disadvantages:

- when you use a method grinding of the sample is conducted to a fineness of grain - 0,147 mm, which is costly;

- expressnet method does not meet modern requirements.

The disadvantages of the prototype due to the existing requirements for grinding samples, in accordance with which of the sample for assay analysis, need to be thin grinding.

The technical result of the invention is to improve expressnet assay analysis and reduction of its cost.

This result is achieved by the fact that in the proposed method of determination of noble metals, comprising mixing the sample crushed to a grain size of 1 mm, with a mixture containing lead oxides, starch, carbonate, desativada tetraborate and sodium nitrate in the amount calculated using the formula depending on the composition of the sample, melting the mixture and quantitative registration of precious metals in the water mass of the oxides of lead, used as a flux, and starch is calculated by the formula the objects with regenerative ability,

where GFL- the mass of the oxides of lead, used as a flux, g;

W - weight of starch, g;

bxABOUTyand b - molecular weight (g) used for the analysis of non-stoichiometric lead oxide and lead oxide (II), respectively;

CSCAsCSb,, is the mass concentration of silicon oxide, sulfur, arsenic, antimony, manganese, chromium, respectively, in the sample, %;

m is the mass of the analyzed sample samples,

The method is as follows. To assay the analysis of the received samples crushed to a particle size of grain - 1 mm Directly from the sample material without additional grinding of selected analytical sample, which is a significant difference. Material analytical sample is mixed with the mixture containing the following components: lead oxides, starch, carbonate, desativada tetraborate and sodium nitrate. The number of lead oxides used as fluxes, and starch are calculated according to formulas that represent significant differences:

for objects with an oxidizing ability,

for objects with regenerative ability,

where GFL-Oyand b - molecular weight (g) used for the analysis of non-stoichiometric lead oxide and lead oxide (II), respectively;

CSCAsCSb,, is the mass concentration of silicon oxide, sulfur, arsenic, antimony, manganese, chromium, respectively, in the sample, %;

m is the mass of the analyzed sample samples,

Then the mixture is melted and determine the melt precious metals. The invention is illustrated by the following examples.

Example 1. Analyzing a control sample having oxidizing ability, crushed to a grain size of 1 mm When m=0.05 kg; CAu=5.8 g/t; Vp=3·10-5m3; d=rEAI/rPb=0,0015:0,07=0,02; =77,2%; =0,18%. Conduct fire assay samples. Using the mixture composition, kg: b (collector) = 54·10-3; b (flux) = 60-10-3(100% of rated); Na2CO3=25·10-3; Na2B4O7·10H2O=4·10-3; starch = 2·10-3. Found: CAu=5.7 g/t (the degree of extraction of gold, 98%).

Example 2. Conduct fire assay of the same sample. Using the mixture composition, kg: b (collector) = 54·10-3; b (flux) = 48·10-3 (80% of rated); Na2CO3=25·10-3; Na2gold 94%). Individual particles of the sample material does not dissolve in the slag: that leads to loss of precious metals.

Example 3. Conduct fire assay of the same sample. Using the mixture composition, kg: b (collector) = 54·10-3; b (flux) = 72·10-3(120% of rated); Na2CO3=25·10-3; Na2B4O7·10H2O=4·10-3; starch = 2·10-3(100% of rated). Found: CAu=5.7 g/t (the degree of extraction of gold, 98%). Rapid wear of refractory crucibles, increase the cost of analysis.

Example 4. Conduct fire assay of the same sample. Using the mixture composition, kg: b (collector) = 54·10-3; b (flux) = 60·10-3; Na2CO3=25·10-3; Na2B4O7·10H2O=4·10-3; starch = 1.6 x 10-3(80% of rated). Found: CAu=5,4 g/t (grade gold recovery of 94%). No formation of lead alloy sufficient mass that leads to loss of precious metals.

Example 5. Conduct fire assay of the same sample. Using the mixture composition, kg: b (collector) = 54·10-3; b (flux) = 60·10-3; Na2CO3=25·10-3; Na2B4O7·10H2O=4·10-3; starch = is established to metallic lead, not there is a complete digestion of the sample, resulting in loss of precious metals.

Example 6. Analyzing a control sample having reducing ability, crushed to a grain size of 1 mm When m=0.025 kg; Vp=5·10-5m3; d=rEAI/rPb=0,0015:0,07=0,02; CAu=34 g/t; CSiO2=26%; CS=1%. Conduct fire assay samples of the specified structure. Using the estimated number of components of the charge, kg: b (collector) = 61·10-3; b (flux) = 1·10-3; Na2CO3=9·10-3; Na2B4o7·10H2ABOUT=22·10-3; starch = 0,4·10-3(100% of rated). Found: CAu=33.3 g/t-gold recovery 98%).

Example 7. Conduct fire assay of the same sample. Using the mixture composition, kg: b (collector) = 61·10-3; b (flux) = 1 to 10-3; Na2CO3=9·10-3; Na2B4O7·10H2ABOUT=22·10-3; starch = 0,3·10-3(80% of rated). Found: CAu=32,0 g/t (grade gold recovery of 94%). Reduced output lead alloy, which leads to loss of precious metals.

Example 8. Conduct fire assay of the same sample. Using the mixture composition, kg: b (collect-3; starch = 0,5·10-3(120% of rated). Found: CAu=31,5 g/t (grade gold recovery of 93%). The formation of matte, which is a source of loss of precious metals.

According to the experimental validation of the proposed method for the determination of noble metals in comparison with the prototype due to the fact that there is no operation for fine grinding of the sample, has the following techno-economic advantages of:

- expressnet assay analysis is increased by 15-20%;

- cost assay analysis is reduced by 15-20%;

- reduces the amount of equipment required for the production of assay analysis.

The most appropriate use of the proposed method in the exploration.

Sources of information

1. Baryshnikov I. F. Probootborniki and analysis of noble metals. - M.: Metallurgy, 1978, S. 116-142.

2. A. S. No. 1695168 “Method of determination of noble metals”. C. A. Shvetsov (prototype).

The method of determination of noble metals, comprising mixing the sample with a mixture containing lead oxides, starch, carbonate, desativada tetraborate and sodium nitrate in the amount calculated using the formula in adnych metals in water characterized in that the used sample with grain size of 1 mm, and the mass of the oxides of lead, used as a flux, and starch are calculated according to formulas

for objects with an oxidizing ability,

for objects with regenerative ability,

where GFL- the mass of the oxides of lead, used as a flux, g;

and - molecular weight (g) used for the analysis of non-stoichiometric lead oxide and lead oxide (II), respectively;

W - weight of starch, g;

mass concentration of silicon oxide, sulfur, arsenic, antimony, manganese, chromium, respectively, in the sample, %;

m is the mass of the analyzed sample sample,

 

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