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Method for extracting tantalum and niobium through low alkali decomposition of tantalum-niobium ore

A technology of tantalum-niobium ore and niobic acid, which is applied in the field of tantalum-niobium ore decomposition, can solve the problems of high decomposition temperature, large alkali consumption, fluorine pollution, etc., and achieves the effects of high decomposition rate, reduced alkali consumption and simple process flow

Inactive Publication Date: 2013-06-19
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0005] Aiming at the problems of serious fluorine pollution in the current hydrofluoric acid process, unsuitability for processing low-grade ore, refractory tantalum-niobium ore and traditional alkali fusion method with high decomposition temperature, large alkali consumption and high cost, the present invention proposes a simple process flow A method for extracting tantalum and niobium by low-alkali decomposition of tantalum-niobium ore with high decomposition rate and economical tantalum-niobium ore

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  • Method for extracting tantalum and niobium through low alkali decomposition of tantalum-niobium ore

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Effect test

Embodiment 1

[0019] After mixing sodium hydroxide and tantalum-niobium ore evenly, put them into a muffle furnace, the mass ratio of alkali ore in the mixture is 1:1, the initial mineral particle size of tantalum-niobium ore is 58-75 μm, decompose at 650°C for 30 minutes, and react After finishing, obtain the decomposition product containing sodium metatantalate and sodium metaniobate and a small amount of sodium tantalate and sodium niobate, after the decomposition product cools down to normal temperature, add 5ml 0.6mol / L fluosilicic acid and use initial concentration as 4.00mol / L hydrofluoric acid was leached for 2 hours at 60°C under the condition that the liquid-solid ratio (m:v) was 10:1, and the ore pulp was obtained after leaching.

[0020] According to ICP-AES analysis, the decomposition rates of tantalum and niobium in tantalum-niobium ore are 99.2% and 99.5%, respectively.

Embodiment 2

[0022] After mixing sodium hydroxide and tantalum-niobium ore evenly, put them into a muffle furnace. The mass ratio of alkali ore in the mixture is 12:1. The initial mineral particle size of tantalum-niobium ore is 75-106 μm. Decompose at 600°C for 50 minutes, and react After finishing, obtain the decomposition product containing sodium metatantalate and sodium metaniobate and a small amount of sodium tantalate and sodium niobate, after the decomposition product is cooled to normal temperature, add 0.5g quartz and use initial concentration to be 5.06mol / L hydrogen Under the conditions of 70°C and liquid-solid ratio (m:v) of 8:1, the hydrofluoric acid was transformed and leached for 3 hours, and the ore pulp was obtained after leaching.

[0023] According to ICP-AES analysis, the decomposition rates of tantalum and niobium in tantalum-niobium ore are 99.1% and 99.3%, respectively.

Embodiment 3

[0025] After mixing sodium hydroxide and tantalum-niobium ore evenly, put them into a muffle furnace, the mass ratio of alkali ore in the mixture is 1.5:1, the initial mineral particle size of tantalum-niobium ore is 58-75 μm, decompose at 550°C for 60 minutes, and react After finishing, obtain the decomposition product containing sodium metatantalate and sodium metaniobate and a small amount of sodium tantalate and sodium niobate, after the decomposition product is cooled to normal temperature, add 0.8g silica gel and use initial concentration to be 5.39mol / L hydrogen Under the conditions of 80°C and liquid-solid ratio (m:v) of 7:1, the hydrofluoric acid was transformed and leached for 2 hours, and the ore pulp was obtained after leaching.

[0026] According to ICP-AES analysis, the leaching rates of tantalum and niobium in tantalum-niobium ore are 99.1% and 99.5%, respectively.

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Abstract

The invention relates to a method for extracting tantalum and niobium through low alkali decomposition of a tantalum-niobium ore. According to the method, a small amount of sodium hydroxide is used as a melting agent for roasting decomposition of the tantalum-niobium ore to allow tantalum and niobium to be converted into sodium metatantalate and sodium metaniobate; and then, under the condition of addition of a conversion agent, tantalum and niobium in a roasting product are extracted with diluted hydrofluoric acid at a low temperature so as to obtain ore pulp containing fluotantalic acid and fluoniobic acid. The method provided by the invention has the advantages of simple process flow, small consumption of alkali, low cost and capacity of realizing nearly 100% of a tantalum-niobium ore decomposition rate.

Description

technical field [0001] The invention relates to a method for decomposing tantalum-niobium ore, in particular to a method for extracting tantalum and niobium by decomposing tantalum-niobium ore with low alkali content. Background technique [0002] Tantalum and niobium are rare metals with high melting points, and they are widely used in electronics, steel and other industries, space navigation, computing technology and medicine. At present, domestic and foreign methods of processing tantalum-niobium ore mainly include hydrofluoric acid decomposition method and alkali fusion method. Hydrofluoric acid decomposition method is the main method used in industry at present. In the hydrofluoric acid decomposition method, high-concentration hydrofluoric acid or high-concentration hydrofluoric acid-sulfuric acid mixed acid is used to decompose tantalum-niobium minerals. During this process, 6-7% of hydrofluoric acid is volatilized in the form of waste gas, causing serious air pollut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B3/06C22B34/24
CPCY02P10/20
Inventor 郑诗礼杨秀丽王晓辉魏昶张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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