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Method for removing bismuth and antimony in electrolytic silver powder by utilizing clay-graphite crucible for smelting

A technology of electrolytic silver powder and graphite crucible, which is applied in the field of removing bismuth and antimony from electrolytic silver powder by smelting clay graphite crucible, which can solve the problems of increasing the labor load of employees and increasing production costs, etc.

Inactive Publication Date: 2012-02-22
山东黄金冶炼有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not only increases the production cost, but also greatly increases the labor load of employees

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] The first step: mix electrolytic silver powder, potassium nitrate with 1% weight of electrolytic silver powder, borax with 3% weight of electrolytic silver powder, and quartz powder with 2% weight of electrolytic silver powder, add them into a clay graphite crucible, and react at 1300°C for 2 hours;

[0020] Among them, the particle size of the quartz powder used is required to be Φ<0.074mm.

[0021] Step 2: Pour the electrolytic silver powder after the reaction into a cast iron mold and cool it into a high-purity silver ingot. Scum is separated during discharge.

[0022] Using inductively coupled plasma emission spectrometer ICP detection, the content of bismuth and antimony in the finished product is lower than the detection limit of 0.0005%.

Embodiment 2

[0024] The first step: mix electrolytic silver powder, sodium nitrate with 2% weight of electrolytic silver powder, borax with 2% weight of electrolytic silver powder and quartz powder with 3% weight of electrolytic silver powder, add them into clay graphite crucible, and react at 1100°C for 3 hours;

[0025] Among them, the particle size of the quartz powder used is required to be Φ<0.074mm.

[0026] The second step: discharging, the scum is separated during the discharging process.

[0027] Using inductively coupled plasma emission spectrometer ICP detection, the content of bismuth and antimony in the finished product is lower than the detection limit of 0.0005%.

Embodiment 3

[0029] The first step: mix electrolytic silver powder, potassium nitrate with 1.5% weight of electrolytic silver powder, borax with 2.5% weight of electrolytic silver powder and quartz powder with 2.5% weight of electrolytic silver powder, add them into clay graphite crucible, and react at 1200°C for 3 hours;

[0030] Among them, the particle size of the quartz powder used is required to be Φ<0.074mm.

[0031] Step 2: Pour the electrolytic silver powder after the reaction into a cast iron mold and cool it into a high-purity silver ingot. Scum is separated during discharge.

[0032] Using inductively coupled plasma emission spectrometer ICP detection, the content of bismuth and antimony in the finished product is lower than the detection limit of 0.0005%.

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PUM

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Abstract

The invention relates to a method for removing bismuth and antimony in electrolytic silver powder by utilizing a clay-graphite crucible for smelting, which comprises the steps of uniformly mixing the electrolytic silver powder, saltpeter which accounts for 1-2% of the weight of the electrolytic silver powder, borax which accounts for 2-3% of the weight of the electrolytic silver powder and quartz powder which accounts for 2-3% of the electrolytic silver powder, adding into the clay-graphite crucible, and carrying out the reaction for 2-3h under the condition of 1100-1300 DEG C. The use of the method for treatment can lead the content of the bismuth and the content of the antimony in the electrolytic silver powder to be less than 0.0005%, achieve the GB / T 4135-2002.1 silver standard, and greatly prolong the service life of the crucible.

Description

(1) Technical field [0001] The invention relates to a method for removing bismuth and antimony in electrolytic silver powder by smelting in a clay graphite crucible. (two), background technology [0002] The existing silver refining process mainly includes silver electrolysis, chemical refining, solvent extraction and so on. According to many years of practice, the silver produced by the silver electrolysis process does not reach 2 # silver standard. However, chemical refining or solvent extraction requires a large amount of investment and requires too much space. [0003] The silver produced by silver electrolytic refining in some refineries contains a small amount of bismuth, antimony and other impurities, and the finished product does not meet GB / T 4135-2002·2 # The silver standard, even after repeated electrolysis, still does not meet the technical requirements. Not only increased production costs, but also greatly increased the workload of employees. (3) Contents ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00
Inventor 范卿陈光辉孙玉刚周发军
Owner 山东黄金冶炼有限公司