A detection method of nitric acid insoluble content in high-purity silver ingots

A detection method, silver ingot technology, applied in the direction of removing certain component weighing, measuring devices, instruments, etc., can solve the problems of high detection cost and inaccurate detection results, so as to reduce the operation steps, solve the problem of high cost, The effect of avoiding the use of nitric acid

Active Publication Date: 2022-05-13
ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The embodiment of the present application solves the problems of high detection cost and inaccurate detection results of existing detection methods for impurities in silver ingots by providing a detection method for the content of nitric acid insolubles in high-purity silver ingots. The detection method of the present application is simple and direct While detecting the content of nitric acid insolubles in high-purity silver ingots, it reduces the use of nitric acid and avoids the waste of silver ingots

Method used

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  • A detection method of nitric acid insoluble content in high-purity silver ingots
  • A detection method of nitric acid insoluble content in high-purity silver ingots
  • A detection method of nitric acid insoluble content in high-purity silver ingots

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Embodiment 1

[0057] (1) 5 ± 0.1kg high-purity silver ingots are packed into graphite boats;

[0058] (2) Put the graphite material boat equipped with high-purity silver ingots into a high-temperature furnace at 1100 ° C and protected by a nitrogen atmosphere, and the effective temperature zone of the high-temperature furnace has a length of 750 cm;

[0059] (3) The push rod in the high-temperature furnace pushes the graphite boat containing high-purity silver ingots from the entrance of the high-temperature furnace to the exit of the high-temperature furnace at a pushing speed of 5cm / min. Every time the push rod is pushed for 30 minutes, stop pushing for 30 seconds, and then continue to move forward promote;

[0060] (4) When reaching the exit of the high-temperature furnace, observe the appearance of the upper surface of the silver ingot in the graphite material boat, and measure it with a ruler, such as Figure 5 , the total length of the silver ingot out of the furnace is about 20cm, w...

Embodiment 2

[0062] (1) 5 ± 0.1kg high-purity silver ingots are packed into graphite boats;

[0063] (2) Put the graphite material boat equipped with high-purity silver ingots into a high-temperature furnace at 1100 ° C and protected by a nitrogen atmosphere, and the effective temperature zone of the high-temperature furnace has a length of 750 cm;

[0064] (3) The push rod in the high-temperature furnace pushes the graphite boat containing high-purity silver ingots from the entrance of the high-temperature furnace to the exit of the high-temperature furnace at a pushing speed of 5cm / min. Every time the push rod is pushed for 30 minutes, stop pushing for 30 seconds, and then continue to move forward promote;

[0065] (4) When reaching the exit of the high-temperature furnace, observe the appearance of the upper surface of the silver ingot in the graphite material boat, and measure it with a ruler, such as Figure 6 , the total length of the silver ingot out of the furnace is about 20cm, w...

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Abstract

This application discloses a method for detecting the content of nitric acid insolubles in high-purity silver ingots, which belongs to the technical field of impurity detection, and solves the problems that the current detection method for the content of nitric acid insolubles in high-purity silver ingots is likely to cause high detection costs and inaccurate detection. The mass percentage of silver in the high-purity silver ingot is not less than 99.99%, and the detection method includes the following steps: melting the high-purity silver ingot under a protective gas atmosphere, moving the high-purity silver ingot intermittently during the melting process; After cooling, the silver ingot is obtained from the furnace, and the upper surface of the silver ingot from the furnace forms a foreign matter area and a mirror bright area; the content of nitric acid insoluble matter in the high-purity silver ingot is determined according to the ratio of the area of ​​the foreign matter area to the quality of the high-purity silver ingot. The detection method of the present application is simple and convenient, and prevents the waste of silver ingots.

Description

technical field [0001] The application relates to the technical field of impurity detection, in particular to a method for detecting the content of nitric acid insolubles in high-purity silver ingots. Background technique [0002] In the GB / T 4135-2016 "Silver Ingot" national standard, the impurity content in silver ingots is specified as Cu, Pb, Fe, Sb, Se, Te, Bi, Pd and the sum of impurities, and then the silver ingots are divided into IC-Ag99 according to the sum of impurities. .99, IC-Ag99.95 and IC-Ag99.90. In this application, IC-Ag99.99 is called high-purity silver ingot. [0003] However, when many companies purchase high-purity silver ingots, they only detect elements such as Cu, Pb, Fe, Sb, Se, Te, Bi, and Pd. Impurity detection. For further analysis, high-purity silver ingots were drilled and sampled, dissolved with analytical pure nitric acid, and the silver nitrate solution was filtered through a microporous membrane, and gray or yellow foreign matter appeare...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N5/04G01N23/2251G01N23/2202
CPCG01N5/04G01N23/2251G01N23/2202G01N2015/0061G01N15/0618G01N33/2028
Inventor 周克武张秀芳宋振阳万岱杨昌麟缪仁梁林应涛陈松扬魏庆红
Owner ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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