Ta metallurgical by-product composite salt recycling method

A compound salt and by-product technology, applied in the field of metallurgy, can solve the problems of non-recyclable ultra-fine tantalum powder and tantalum oxide, unfavorable low-cost recovery, and harsh distillation environment, so as to avoid environmental problems, realize reuse, and improve efficiency. Yield effect

Inactive Publication Date: 2019-03-15
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the process of this method is complicated, and it needs to invest a large amount of deionized water and acid, which is costly and produces a large amount of new waste water. The ultrafine tantalum powder and tantalum oxide remaining in the product cannot be recovered

Method used

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  • Ta metallurgical by-product composite salt recycling method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The by-product compound salt produced in the production of tantalum powder by sodium chloride as a diluent and sodium reduction potassium fluorotantalate is separated, the residual sodium is washed with deionized water, and the jaw crusher is used to crush it into small pieces with a particle diameter of about 50mm. Use drying equipment for resistance to F - , Cl - Corrosion vacuum oven, drying at a drying temperature of 150°C for 15 hours, after drying, the water content of the compound salt is 0.2%; the obtained compound salt contains diluent sodium chloride, sodium fluoride produced in the production process and potassium fluoride, residual ultrafine tantalum powder and tantalum oxide.

[0022] 60 kilograms of the compound salt of gained is used as diluent, 120 kilograms of potassium fluorotantalate, and 36 kilograms of sodium injections are produced according to the technical requirements of reduction production of tantalum powder. It can be seen from Table 2 that...

Embodiment 2

[0024] Separating the by-product compound salt produced in the production of tantalum powder by reducing potassium fluorotantalate with potassium chloride as a diluent, washing the residual sodium with deionized water, and crushing it into small pieces with a particle diameter of about 50mm by using a jaw crusher. Use drying equipment for resistance to F - , Cl - Corrosion vacuum oven, under the condition of drying temperature of 150 ℃, drying time is 15h, after drying, the water content of compound salt is 0.2%; the obtained compound salt contains diluent potassium chloride, produced in the production process Sodium and potassium fluoride, residual ultrafine tantalum powder and tantalum oxide.

[0025] 60 kilograms of compound salts of gained are used as diluent, 150 kilograms of potassium fluorotantalates, and 45 kilograms of sodium injections are reduced to produce tantalum powder. The tantalum powder produced as a diluent is fully compliant with the tantalum powder stand...

Embodiment 3

[0027] Using sodium chloride and potassium chloride as the diluent, the by-product compound salt produced in the production of tantalum powder by sodium reduction of potassium fluorotantalate is separated, the residual sodium is washed with deionized water, and the particle diameter is about 50mm by jaw crusher. For small pieces, use drying equipment for resistance to F - , Cl - Corrosion vacuum oven, drying at a drying temperature of 150°C for 15 hours, after drying, the water content of the compound salt is 0.3%; the obtained compound salt contains diluents sodium chloride and potassium chloride, produced during the production Sodium fluoride and potassium fluoride, residual ultrafine tantalum powder and tantalum oxide.

[0028] 60 kilograms of the compound salt of gained is used as diluent, 200 kilograms of potassium fluorotantalate, inject 60 kilograms of sodium and reduce the technological requirement of producing tantalum powder to produce, and the result of gained tant...

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Abstract

The invention discloses a Ta metallurgical by-product composite salt recycling method. The method comprises the following steps: (1) after separating by-product composite salt produced during the Ta metallurgical process from Ta powder, the composite salt is rinsed with deionized water to remove the residue Na, and then the rinsed composite salt is crushed by a crusher and dried to obtain the treated composite salt; and (2) the treated composite salt is used as diluent, and is mixed with potassium fluotantalate based on certain proportion according to the process requirements and the mixture is taken to a furnace, and the Na is inlet for metallurgy process restoration to obtain the Ta powder. The by-product composite salt produced during the Ta metallurgical production process is used to produce the metallurgical-level Ta powder as the diluent, so that the recycling of the by-product composite salt is realized, the environmental problem caused by the by-product composite salt is avoided, and at the same time, cost is greatly saved. The method also has the advantages that the reuse of waste resources is realized, environmental pollution is reduced, direct yield of the Ta powder is effectively improved, and the Ta powder prepared according the recycling method meets the industry standard of metallurgical Ta powder.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and in particular relates to a method for recovering and reusing compound salt, a by-product of tantalum metallurgy. Background technique [0002] The reduction of potassium fluorotantalate to tantalum powder is a kind of tantalum powder prepared by using potassium fluorotantalate and sodium as the main raw materials, and using sodium chloride, potassium chloride, potassium fluoride and other halogen salts or mixtures of halogen salts as diluents to prepare tantalum powder. Method, its main reaction mechanism is as follows: [0003] K 2 TaF 7 +5Na=Ta+5NaF+2KF(1) [0004] Under argon protection and a certain temperature K 2 TaF 7 , and the above reaction occurs with liquid sodium. This reaction is an exothermic reaction. When the reaction starts, a large amount of heat is released, which makes the reaction speed too fast. Therefore, the control of the reaction speed depends on the heat ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/24C22B7/00
CPCC22B7/001C22B34/24Y02P10/20
Inventor 潘泽强李韧
Owner ZHUZHOU HARD ALLOY GRP CO LTD
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