Purifying method for silver electrolytic solution

A technology of purification treatment and electrolyte, applied in the direction of photography process, instrument, photography auxiliary process, etc., can solve the problems of not being able to be removed at the same time, unsafe production, etc.

Inactive Publication Date: 2006-12-27
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method cannot remove lead Pb and copper Cu in the electrolyte at the same time, and it is easy

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A method for purifying a silver electrolyte is to heat the silver electrolyte to be purified, and utilize Ag to form hydrated ions Ag(OH) in an aqueous solution. 2 - , Adjust the pH value of the silver electrolyte to be purified to 8. At this time, most of the Pb, Cu, Bi, and Sb in the electrolyte were precipitated at the bottom of the electrolyte in the form of hydroxide, and left to stand for 7 hours; the supernatant was filtered out, and the impurities in the supernatant were now Pb, Cu, Bi, Sb, etc. have been reduced to 10 -2 Below the order of g / l, use nitric acid to adjust the electrolyte to an acid content of 3g / l and a silver content of 80g / l, and then return it to the electrolytic cell for use.

Embodiment 2

[0020] A method for purifying silver electrolyte is to heat the silver electrolyte to be purified and add a small amount of silver oxide Ag 2 O as the initiator, using Ag to form hydrated ions Ag(OH) in aqueous solution 2 - , adjust the pH value of the silver electrolyte to be purified to 9. At this time, most of the Pb, Cu, Bi, and Sb in the electrolyte were precipitated at the bottom of the electrolyte in the form of hydroxides; left to stand for 8 hours; the supernatant was filtered out, and the impurities in the supernatant were now Pb, Cu, Bi, Sb, etc. have been reduced to 10 -2 Below the order of g / l, use nitric acid to adjust the electrolyte to an acid content of 6g / l and a silver content of 100g / l, and then return it to the electrolytic cell for use.

Embodiment 3

[0022] A method for purifying silver electrolyte is to heat the silver electrolyte to be purified and add a small amount of silver oxide Ag 2 O is used as initiator, and the pH value of the silver electrolyte to be purified is adjusted to 8. At this time, most of the Pb, Cu, Bi, and Sb in the electrolyte were precipitated at the bottom of the electrolyte in the form of hydroxide; left to stand for 9 hours; the supernatant was filtered out, and the impurities in the supernatant were now Pb, Cu, Bi, Sb, etc. have been reduced to 10 -2 Below the order of g / l, use nitric acid to adjust the electrolyte to an acid content of 9g / l and a silver content of 120g / l, and then return it to the electrolytic cell for use.

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PUM

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Abstract

This invention is the purification method of silver electrolyte. Heating the silver electrolyte that need to be purified, the Ag can generate aqueous Ag (OH) 2- ions in solution, so most Pb, Cu, Bi, Sb deposit with the form of hydroxides to the bottom of electrolyte and removed. This invention can be applied during electrolyte and refining of Ag, and plays the pivot role in production of qualified silver. There is any agent needed during purification. The electrolyte can be reused.

Description

technical field [0001] The invention relates to a method for purifying electrolyte, in particular to a method for purifying silver electrolyte. Background technique [0002] The electrolytic refining of metals is a well known prior art and is widely used in practice. For example, in the electrolytic refining process of silver, coarse silver is used as anode, titanium plate is used as cathode, silver nitrate AgNO 3 Aqueous solution is used as electrolyte, at DC voltage 2-3V, current 250-300A / m 2 99.99% silver can be obtained by refining under certain conditions, and the pH value of the electrolyte is adjusted by adding acid. [0003] Before electrolysis, coarse silver generally contains a small amount of impurities of various metal components such as lead Pb, copper Cu, bismuth Bi, antimony Sb, etc. During the electrolysis process, these impurities enter the electrolyte, and as the electrolysis operation time prolongs, the impurities continue to accumulate in the electroly...

Claims

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Application Information

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IPC IPC(8): C25C1/20C25C7/00
Inventor 蔡练兵
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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