Process for clean conversion of tantalum niobium ore

A tantalum-niobium ore and clean technology, which is applied in the clean conversion field of extracting potassium hexatantalate (6O19·nH2O) and potassium metatantalate (O3), can solve the problem of low decomposition rate of tantalum-niobium ore, large consumption of HF acid and environmental pollution. and other problems, to achieve the effect of improving resource utilization, huge environmental benefits, and shortening response time

Inactive Publication Date: 2005-04-13
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to overcome the defects of large consumption of HF acid in the prior art, serious environmental pollution, low decomposition rate of refractory tantalum-niobium ore, high cost, and low yield, thereby providing a highly toxic H

Method used

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  • Process for clean conversion of tantalum niobium ore

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The potassium hydroxide alkali solution that circulates back to the reaction kettle is heated up to 300 ° C, and -200 mesh tantalum-niobium ore is added. The mass ratio of alkali solution: tantalum-niobium ore is 4: 1, mixed completely under stirring, and reacted for 3 hours to obtain Decomposition products;

[0026] At 30°C, dilute the above decomposition product with water until the KOH concentration in the solution is 600g / L, filter to obtain the crude product containing potassium tantalum (niobium) and a concentrated potassium hydroxide solution containing very little impurity, the potassium hydroxide The concentrated solution can be used for the decomposition reaction in the above steps after evaporation and dehydration;

[0027] At 70°C, the crude product containing potassium tantalum (niobium) was leached for 30 minutes with a potassium hydroxide solution of 88 g / L, and filtered while it was hot to obtain potassium hexatantalum (niobium) (K 8 (Ta, Nb) 6 o 19 ·...

Embodiment 2

[0032] The potassium hydroxide alkali solution that circulates back to the reactor is heated to 340°C, and -200 mesh refractory tantalum and niobium enrichment slag is added. The mass ratio of alkali solution: refractory tantalum and niobium enrichment slag is 3:1, and the Mix completely and react for 1 hour to obtain the decomposition product;

[0033] At 20°C, dilute the above-mentioned decomposition product with water until the KOH concentration in the solution is 550g / L, filter to obtain the crude product containing potassium tantalum (niobium) and a concentrated solution of potassium hydroxide containing very little impurity, the potassium hydroxide The concentrated solution can be used for the decomposition reaction in the above steps after evaporation and dehydration;

[0034] At 60°C, the crude product containing potassium tantalum (niobium) was leached for 40 minutes with a potassium hydroxide solution of 60 g / L, and filtered while it was hot to obtain potassium hexat...

Embodiment 3

[0039] The potassium hydroxide alkali solution that circulates back to the reaction kettle is heated to 280°C, and -200 mesh refractory tantalum and niobium enrichment slag is added. The mass ratio of alkali solution: refractory tantalum and niobium enrichment slag is 7:1, and the Completely mixed and reacted for 8 hours to obtain decomposition products;

[0040] At 110°C, dilute the above decomposition product with water until the KOH concentration in the solution is 750g / L, filter to obtain the crude product containing potassium tantalum (niobate) and a concentrated potassium hydroxide solution containing very little impurity, the potassium hydroxide The concentrated solution can be used for the decomposition reaction in the above steps after evaporation and dehydration;

[0041] At 100°C, the crude product containing potassium tantalum (niobium) was leached for 40 minutes with a potassium hydroxide solution of 200 g / L, and filtered while hot to obtain potassium hexatantalum...

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Abstract

The clean Ta/Nb ore converting process includes decomposing Ta/Nb ore in KOH and molten salt, diluting and separating decomposed product to obtain high concentration KOH solution and solid phase connecting potassium titanate/niobate, hot water leaching and separating potassium hexatitanate/hexaniobate solution and iron-manganese slag precipitate containing insoluble potassium metatitanate/metaniobate; regulating pH value of hexatitanate/hexaniobate solution to alkali to obtain hexatitanate/hexaniobate crystal and reusable crystalline mother liquid; and decomposing potassium metatitanate/metaniobate and iron-manganese slag with HCl solution to obtain metatitanate/metaniobate crystal. The said process has no fluorine ion pollution and high ore decomposing rate, and may produce potassium titanate/niobate as intermediate for producing various Ta/Nb products.

Description

technical field [0001] The invention relates to a method for converting tantalum and niobium ore, in particular to a method for extracting potassium hexatantalate (niobium) (K 8 (Ta, Nb) 6 o 19 ·nH 2 O) and potassium metatantalum (niobium) (K(Ta, Nb)O 3 ) clean conversion method. technical background [0002] At present, high-concentration HF acid (>60%) or high-concentration HF-H are used at home and abroad 2 SO 4 Mixed acid decomposes tantalum-niobium ore. This process consumes a lot of HF acid, and about 10% of HF is discharged in the form of waste gas, which becomes the main gaseous pollution of tantalum-niobium metallurgy; a large amount of fluorine is also produced in the process of waste liquid treatment. Stone, calcium sulfate residues, 10-15 tons of such residues will be produced every ton of ore is processed, the environmental pollution is very serious, and the decomposition rate of the difficult-to-decompose tantalum-niobium ore is low, only about 85%. ...

Claims

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Application Information

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IPC IPC(8): C22B3/12
Inventor 周宏明郑诗礼张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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