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Preparation method of electronic grade manganous nitrate for tantalum capacitor

A technology of tantalum capacitors and manganese nitrate, which is applied in the field of preparation of electronic grade manganese nitrate for tantalum capacitors, can solve the problems of uneven manganese dioxide layer, high chemical impurity content, different particle sizes, etc. The effect of good crystal structure and high purity

Inactive Publication Date: 2012-07-18
NINGXIA ORIENT TANTALUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The manganese dioxide produced by using general high-purity manganese nitrate has low purity and poor crystal structure, and the obtained manganese dioxide layer is uneven, not dense, with different particle sizes and weak adhesion; and it causes iron, calcium, lead, potassium High content of chemical impurities such as magnesium and magnesium

Method used

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  • Preparation method of electronic grade manganous nitrate for tantalum capacitor

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Add 950L of pure water, turn on the stirring paddle and ventilate, slowly add 180L of analytical pure nitric acid, stir evenly, and obtain dilute nitric acid solution.

[0030] The average particle size after crushing (crushing electrolytic manganese metal flakes using a mill and sieve machine), washing (crushing electrolytic manganese powder, using pure water, standing for 10 minutes, and pouring out the supernatant obtained after settling) is 85 mesh. Add a batch of metal manganese (60kg) into the dissolving tank filled with dilute nitric acid, stir while adding, and dissolve completely after 0.5 hours. The pH value of the solution is 6.9, and let it stand for 10 minutes; The tank is subjected to coarse filtration, and the filtrate is filtered into the storage tank, and then dilute nitric acid is used to adjust the acidity of the filtrate, and the pH value is 2.0; 1100L clear liquid is poured into a vacuum concentration pot with a vacuum degree of 0.03Mpa, heated and e...

Embodiment 2

[0032] Add 970L of pure water, turn on the stirring paddle and ventilate, slowly add 190L of analytical pure nitric acid, stir evenly, and obtain dilute nitric acid solution.

[0033] The average particle size after crushing (using a sieving machine to crush the electrolytic manganese metal flakes), washing (the crushed electrolytic manganese powder is washed with pure water, placed for 40 minutes, and the supernatant obtained after settling) is 85 mesh. Add batches of metal manganese (62kg) into the dissolving tank filled with dilute nitric acid, stir while adding, and dissolve completely after 0.5 hours. The pH value of the solution is 7.0, and leave it for 22 minutes; The filter tank is subjected to coarse filtration, and the filtrate is filtered into the storage tank, and then the filtrate is acidified with dilute nitric acid, and the pH value is 3.2; 1120L clear liquid is poured into a vacuum concentration pot with a vacuum degree of 0.04Mpa, heated and evaporated for 24 h...

Embodiment 3

[0035] Add 1000L of pure water, turn on the stirring paddle and ventilate, slowly add 190L of analytical pure nitric acid, stir evenly, and obtain dilute nitric acid solution.

[0036] The average particle size after crushing (crushing electrolytic manganese metal flakes using a mill and sieve machine), washing (crushing electrolytic manganese powder, using pure water, standing for 30 minutes, and pouring out the supernatant obtained after settling) is 90 mesh. Add batches of manganese metal (75kg) into the dissolving tank filled with dilute nitric acid, stir while adding, and dissolve completely after 0.5 hours. The pH value of the solution is 6.7, and let it stand for 25 minutes; Coarsely filter the filter tank, filter the filtrate into the storage tank, and then use dilute nitric acid to adjust the acidity of the filtrate, the pH value is 3.4; put 1200L clear liquid into a vacuum concentration pot with a vacuum degree of 0.05Mpa, heat and evaporate for 24 hours, and the evap...

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Abstract

The invention relates to a preparation method of electronic grade manganous nitrate for a tantalum capacitor, which includes a. adding crushed and washed manganese metal into nitric acid, stirring the mixture while adding the manganese metal till the manganese metal is completely dissolved and then statically placing the mixture for 10 to 40 minutes; b. conducting coarse filtering on the solution, adjusting the pH value of the solution to be 2 to 4 through nitric acid; and c. heating the solution receiving acid adjustment in vacuum mode to condense the solution to the required ratio, adjusting the pH value of the solution through nitric acid to be 2-5, cooling the solution and conducting fine filtering on the solution to obtain a manganous nitrate solution product. The preparation method can be used for preparing liquid manganous nitrate products in batch in industrial mode to achieve using standard of electronic grade products for the tantalum capacitor. Manganese dioxide produced by the electronic grade manganous nitrate is high in purity, good in crystal structure, good in chemical activity, even and compact in layer, small in particle, firm in adhesion, small in resistivity, low in using unit consumption and low in content of chemical impurities such as iron, calcium, lead, potassium and magnesium, thereby being suitable for serving as high-purity catalyst, oxidant, adsorbent and the like.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for preparing electronic-grade manganese nitrate for tantalum capacitors. Background technique [0002] Manganese nitrate (Mn(NO 3 ) 2 4H 2 O) is a multi-purpose chemical raw material, generally used as ceramic colorant and metal phosphating agent, also used as chemical analysis reagent, determination of antimony, separation of silver and rare earth elements, catalyst for hardening oil, resistance and iron It is the raw material of oxygen body and the raw material for the preparation of high-quality manganese dioxide. [0003] High-purity manganese nitrate is also a high-quality raw material for the manufacture of tantalum capacitor electrodes. In solid electrolytic capacitors, the solid electrolyte layer is actually the cathode of the capacitor. decomposed at ℃ to obtain MnO with conductivity 2 Generally, it is necessary to repeatedly impregnate and decompose to...

Claims

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Application Information

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IPC IPC(8): C01G45/08
Inventor 米玺学万军严国元汪文涛温新宁鲁东李辉李明阳邓六良颉维平郑培生
Owner NINGXIA ORIENT TANTALUM IND
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