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Detection method for content of nitric acid insoluble substances in high-purity silver ingot

A detection method and technology for silver ingots, applied in the direction of removing certain components such as weighing, measuring devices, instruments, etc., can solve the problems of inaccurate detection results and high detection costs, so as to solve the problems of high cost, reduce operation steps, and detect Reliable results

Active Publication Date: 2019-07-23
ZHEJIANG FUDA ALLOY MATERIALS TECH CO LTD
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  • Summary
  • 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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  • Detection method for content of nitric acid insoluble substances in high-purity silver ingot
  • Detection method for content of nitric acid insoluble substances in high-purity silver ingot
  • Detection method for content of nitric acid insoluble substances in high-purity silver ingot

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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 Image 6 , the total length of the silver ingot out of the furnace is about 20cm, wh...

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Abstract

The invention discloses a detection method for the content of nitric acid insoluble substances in a high-purity silver ingot, belongs to the technical field of impurity detection, and solves the problems that an existing detection method for the content of nitric acid insoluble substances in a high-purity silver ingot is likely to cause high detection cost and detection inaccuracy. The high-puritysilver ingot comprises 99.99wt% of silver. The detection method comprises the following steps that: carrying out fusion on the high-purity silver ingot under the atmosphere of protection gas, and carrying out intermittent movement on the high-purity silver ingot in a fusion process; after fusion is finished, cooling to obtain a discharged silver ingot, and forming a foreign matter region and a mirror surface bright region on the upper surface of the discharged silver ingot; and according to a ratio of the area of the foreign matter region to the quality of the high-purity silver ingot, determining the content of nitric acid insoluble substances in the high-purity silver ingot. The detection method disclosed by the invention is convenient and simple, and the waste of the sliver ingot is avoided.

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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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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