Method of dissolving tantalum from tantalum-containing material

A material and clinker technology, which is applied in the field of dissolving tantalum from tantalum-containing materials, can solve the problems of unsafe operating environment, increasing the amount of hydrofluoric acid fumes, etc., and achieve the effect of increasing the dissolution rate, improving the separation effect, and improving the operating environment

Active Publication Date: 2020-04-07
XIAN RAREALLOYS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although higher temperature can speed up the reaction rate, it will increase the amount of fume of hydrofluoric acid, which will make the operating environment extremely unsafe

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] This embodiment includes the following steps:

[0025] Step 1, making pellets: crush and grind the tantalum-containing alloy to obtain tantalum-containing alloy slag, then mix 100g of tantalum-containing alloy slag with 65g of analytically pure ammonium bifluoride, and then make pellets under a pressure of 40MPa to obtain a mixture Agglomerate; the mass content of tantalum pentoxide in the tantalum-containing alloy slag is 51%, and the rest are impurities such as Nb, Ti, W, Ni, Cr;

[0026] Step 2, calcining: put the mixture agglomerate obtained in step 1 into a polytetrafluoroethylene crucible, and then calcining at a temperature of 180° C. for 3 hours, and obtain clinker after natural cooling;

[0027]Step 3, dissolving: adding the clinker obtained in step 2 into a sulfuric acid solution medium with a concentration of 6 mol / L, heating and stirring at 90° C. for 1 hour to completely dissolve to obtain a tantalum-containing solution; the clinker The ratio of the mass o...

Embodiment 2

[0030] This embodiment includes the following steps:

[0031] Step 1, making pellets: crush and grind the tantalum-containing alloy to obtain tantalum-containing alloy slag, then mix 100g of tantalum-containing alloy slag with 91g of analytically pure ammonium bifluoride, and then make pellets under a pressure of 20MPa to obtain a mixture Agglomerate; the mass content of tantalum pentoxide in the tantalum-containing alloy slag is 51%, and the rest are impurities such as Nb, Ti, W, Ni, Cr;

[0032] Step 2, calcining: put the mixture agglomerate obtained in step 1 into a polytetrafluoroethylene crucible, then calcining at a temperature of 220°C for 1 hour, and obtain clinker after natural cooling;

[0033] Step 3, dissolving: adding the clinker obtained in step 2 into a sulfuric acid solution medium with a concentration of 2 mol / L, heating and stirring at a temperature of 60° C. for 1 hour to completely dissolve to obtain a tantalum-containing solution; the clinker The ratio of...

Embodiment 3

[0036] This embodiment includes the following steps:

[0037] Step 1. Agglomeration: Mix 100g of industrial-grade tantalum pentoxide powder with a mass purity of 99.4% and 181g of analytically pure ammonium bifluoride evenly, and then make agglomerates under a pressure of 30MPa to obtain mixture agglomerates;

[0038] Step 2, calcining: put the mixture agglomerate obtained in step 1 into a polytetrafluoroethylene crucible, and then calcining for 2 hours at a temperature of 200° C., and obtain clinker after natural cooling;

[0039] Step 3, dissolving: adding the clinker obtained in step 2 into a sulfuric acid solution medium with a concentration of 2 mol / L, heating and stirring at 80° C. for 1 hour to completely dissolve to obtain a tantalum-containing solution; the clinker The ratio of mass to volume of sulfuric acid solution is 1:8.

[0040] Adopt ICP-AES method (inductively coupled plasma emission spectrometer method) to measure the tantalum content in the tantalum-contain...

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Abstract

The invention discloses a method of dissolving tantalum from a tantalum-containing material, which comprises the following steps of: 1, briquetting: crushing tantalum-containing material powder or a blocky tantalum-containing material, grinding, uniformly mixing with a solid fluorine-containing compound, and briquetting to obtain a mixture block mass, 2, calcining: putting the mixture block mass into a crucible for calcining, and naturally cooling to obtain clinker, and 3, dissolving: adding the clinker into a sulfuric acid solution medium, and then heating and stirring until the clinker is completely dissolved to obtain a tantalum-containing solution. The solid fluorine-containing compound is combined with sulfuric acid to replace a mixed solution of HF-H2SO4, dissolution of tantalum is promoted, the tantalum-containing solution obtained by the method is slightly different from a tantalum-containing solution obtained by adopting an HF-H2SO4 mixed solution, and the method can be directly used for subsequent treatment of the tantalum-containing solution in the prior art, avoids the defect that hydrofluoric acid is directly adopted, greatly improves the operation environment, and issimple in process, easy to implement and suitable for popularization.

Description

technical field [0001] The invention belongs to the technical field of recovery and utilization of rare metal resources, and in particular relates to a method for dissolving tantalum from materials containing tantalum. Background technique [0002] Tantalum has the advantage of high corrosion resistance, but it becomes a disadvantage for dissolution and purification, and it is difficult to use common and cheap inorganic acids as their leaching agents. Except for the most corrosive hydrofluoric acid, tantalum is difficult to be dissolved by other inorganic acids, and its solubility is very small. At present, the domestic industry generally adopts hydrofluoric acid and sulfuric acid mixed leaching method to decompose tantalum-containing ore and tantalum-containing slag. Hydrofluoric acid with a mass fraction of 60% to 70% is generally used for leaching, and the decomposition temperature is 90°C to 100°C. And the acid consumption exceeds the stoichiometric theoretical consumpt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/24C22B3/08C22B1/02C22B1/24
CPCC22B1/02C22B1/24C22B3/08C22B34/24Y02P10/20
Inventor 李波王靖坤李进鲁容见高凯郭瑞许万祥
Owner XIAN RAREALLOYS
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