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A Simple, Rapid and Accurate Method for Determining Silver in Lead Anode Slime

An accurate measurement and lead anode slime technology, applied in the direction of weighing by removing certain components, can solve the problem that the addition amount and addition method of the precipitant hydrochloric acid solution cannot be well controlled, and the precipitation of silver chloride and silver ions cannot be precipitated. Complete, complete precipitation of silver chloride precipitates and other issues to achieve the effect of avoiding the problem of filtration, less reagent types and dosage, and low cost

Active Publication Date: 2017-02-15
WESTERN MINING CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lead antimony bismuth as the main component of lead anode slime, when adding precipitant hydrochloric acid solution, if the acidity is controlled to be low, these ions in the solution will co-precipitate with silver chloride in the form of lead dichloride precipitation and antimony bismuth hydrolyzate respectively , leading to the precipitation of silver chloride is not pure enough, and at the same time, the encapsulated silver ions cannot be completely precipitated; 2) The amount and method of adding the precipitant hydrochloric acid solution have not been well controlled
If the amount of chloride ions contained in the added hydrochloric acid solution exceeds the amount of silver equal to the amount of the substance, the excessive chloride ions will dissolve the precipitated silver chloride formed, resulting in a low measurement result; will make the measurement result lower
Similarly, when adding the precipitant solution, if the stirring is not sufficient, the local concentration of chloride ions will be high or low, resulting in the dissolution of silver chloride precipitate or incomplete precipitation of silver ions; 3) precipitation temperature and The standing time will have a great influence on the purity of the silver chloride precipitate and the complete precipitation of silver ions

Method used

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  • A Simple, Rapid and Accurate Method for Determining Silver in Lead Anode Slime
  • A Simple, Rapid and Accurate Method for Determining Silver in Lead Anode Slime
  • A Simple, Rapid and Accurate Method for Determining Silver in Lead Anode Slime

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This implementation example illustrates the determination result of this method to the lower content of silver in lead anode slime.

[0048] The solution preparation is completely operated according to the content of the invention (1).

[0049] Sample analysis: Weigh 2.0 grams of lead anode slime (main components: copper 8.06%, lead 20.16%, bismuth 5.71%, antimony 29.28%, arsenic 2.55%, selenium 1.03%, zinc 1.34%) samples in a series of 250mL beakers , add 20 mL of nitric acid and 2 g of tartaric acid, cover the watch glass, and heat on a low-temperature electric heating plate until the sample is completely dissolved. The following operations are completed according to the steps in the sample analysis (2) of the content of the invention. The obtained measurement results are shown in Table 1.

[0050] Table 1 Determination results of lower silver content in lead anode slime kg / t

[0051]

[0052] The significant difference (95% confidence level) for this method is: ...

Embodiment 2

[0058] This implementation example illustrates the determination results of this method for the medium content of silver in lead anode slime.

[0059] The solution preparation is completely operated according to the content of the invention (1).

[0060] Sample analysis: Weigh 2.0 grams of lead anode slime (main components: copper 10.16%, lead 21.11%, bismuth 7.51%, antimony 33.25%, arsenic 9.88%, selenium 1.27%, zinc 2.91%) samples in a series of 250mL beakers , add 20 mL of nitric acid and 2 g of tartaric acid, cover the watch glass, and heat on a low-temperature electric heating plate until the sample is completely dissolved. The following operations are completed according to the steps in the sample analysis (2) of the content of the invention. The obtained measurement results are shown in Table 2.

[0061] Table 2 Determination results of intermediate silver content in lead anode slime kg / t

[0062]

[0063] According to the requirements in the latest industry standa...

Embodiment 3

[0066] This implementation example illustrates the determination results of this method for high content silver in lead anode slime.

[0067] The solution preparation is completely operated according to the content of the invention (1).

[0068] Sample analysis: Weigh 2.0 grams of lead anode slime (main components: 13.38% copper, 21.9% lead, 8.98% bismuth, 37.43% antimony, 17.11% arsenic, 1.50% selenium, 4.5% zinc, 0.34% nickel, 0.38% cobalt ) sample in a series of 250mL beakers, add 20mL of nitric acid and 2 grams of tartaric acid, cover the watch glass, and heat on a low-temperature electric heating plate until the sample is completely dissolved. The following operations are completed according to the steps in the sample analysis (2) of the content of the invention. The obtained measurement results are shown in Table 3.

[0069] Table 3 Determination results of higher silver content in lead anode slime kg / t

[0070]

[0071] The significant difference (95% confidence le...

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Abstract

The invention belongs to the field of non-ferrous metallurgy, and in particular to a simple and rapid method for accurate determination of silver in lead anode mud. The invention provides a simple and rapid method for accurate determination of silver in lead anode mud in a nitric acid solution medium containing tartaric acid. The method invention can be realized by the following steps: (1) preparation of the required equipment and reagent solution; and (2) the sample analysis. The method provided by the invention has the advantages of high accuracy, high precision and good reproducibility. Because of comprehensive elimination of the influences of several accidental factors, conditions for fully precipitation of silver chloride, fully purification of products and particle filtering are simultaneously well controlled; therefore, the determination quality results of the method are similar to that of fire assay. The method uses less kinds and dosages of reagents, has simple operation, fastness and low cost, avoids the lead steam harm to the environment caused in the fire assay, and has the work efficiency 1 time higher than that of the fire assay, and is particularly suitable for the usage by production units.

Description

technical field [0001] The invention belongs to the field of nonferrous metallurgy, and in particular relates to a simple, rapid and accurate method for determining silver in lead anode slime. Background technique [0002] Lead anode slime is one of the main raw materials for silver recovery. At present, in addition to the classic fire test gold gravimetric method, there are mainly atomic absorption method, volumetric method and gravimetric method for the determination of silver. As a national standard method, fire assay gold has the advantages of accurate results, stability, reliability, and wide applicability of materials, but it has the disadvantages of lengthy process, high cost, heavy labor, and environmental pollution; The gradual dilution of the solution and the normal drift of the instrument baseline lead to large fluctuations in the results and poor reproducibility; different operators have different observations on the titration end points of the potassium iodide ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/04
Inventor 吴敏梁金风魏文辉何菱李永芳
Owner WESTERN MINING CO LTD
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