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Method for treating potassium feldspar according to sub-molten salt method to prepare potassium carbonate

A sub-molten salt method, potassium feldspar technology, applied in the direction of alkali metal carbonate, chemical instruments and methods, alkali metal compounds, etc., to achieve the effect of strengthening reaction and transfer, reducing reaction temperature, and reducing energy consumption

Inactive Publication Date: 2014-03-26
FUJIAN NORMAL UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no report on the use of sub-molten salts for the decomposition of potassium feldspar ore

Method used

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  • Method for treating potassium feldspar according to sub-molten salt method to prepare potassium carbonate
  • Method for treating potassium feldspar according to sub-molten salt method to prepare potassium carbonate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] 1) will K 2 The potassium feldspar ore powder (i.e. potassium feldspar fine powder) with a weight percentage of 7.53% is processed and crushed to 200 meshes, and the NaOH solution with a mass fraction of 60% is mixed in a ratio of 1:5 by weight, and stirred evenly Finally, the stirring rate is 400r / min, and the reaction temperature is 160°C under normal pressure conditions to react for 130min; after cooling at room temperature, the resulting mixture is filtered and washed repeatedly to obtain a potassium-containing filtrate, and the dissolution rate of potassium is 98.58%. ; The resulting filtrate was transferred to a three-necked flask, and CO was passed into the resulting filtrate 2 Carry out acidification and neutralization. During the acidification process, white precipitates are produced. Stop the reaction after the pH of the solution drops to 8, and filter out the precipitates (hydrated silica precipitates); 2) Evaporate the filtered potassium-containing mothe...

Embodiment 2

[0034] 1) will K 2 The O weight percentage content is 16% and is processed and crushed to 200 mesh potassium feldspar fine powder and the NaOH solution that the mass fraction is 80% is mixed in the ratio of 1:4 by weight, after being stirred evenly, be placed in the tank with agitator In the condensing reflux device, the stirring rate is 400r / min, and the reaction temperature is 210°C under normal pressure conditions for 120min; after cooling at room temperature, the resulting mixture is filtered and washed repeatedly to obtain a potassium-containing filtrate. The dissolution rate of potassium was 98.25%; the resulting filtrate was transferred to a three-necked flask, and CO was passed into the resulting filtrate 2 Carry out acidification and neutralization. During the acidification process, white precipitates are produced. After the pH of the solution drops to 8, the reaction is stopped, and the precipitates (hydrated silica precipitates) are filtered off; Evaporate, crystal...

Embodiment 3

[0036] 1) will K 2 The O weight percentage content is 7.53% and is processed and pulverized to 150 mesh potassium feldspar fine powder and the NaOH solution that the mass fraction is 60% is mixed in the proportion that is 1:4.5 by weight, after being stirred evenly, place in the tank with agitator In the condensing reflux device, the stirring rate is 500r / min, and the reaction temperature is 150°C under normal pressure conditions for 135min; after cooling at room temperature, the resulting mixture is filtered and washed repeatedly to obtain a potassium-containing filtrate. The dissolution rate of potassium Be 98.67%; Gained filtrate is transferred in the three-necked flask, feeds CO to the gained filtrate 2 Carry out acidification and neutralization. During the acidification process, white precipitates are produced. Stop the reaction after the pH of the solution drops to 8, and filter out the precipitates (hydrated silica precipitation); 2) Evaporate the filtered potassium-con...

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Abstract

The invention discloses a method for treating potassium feldspar according to the sub-molten salt method to prepare potassium carbonate. The method comprises the following steps: potassium feldspar reacts in a sub-molten salt NaOH liquid-phase medium, wherein the mass ratio of the NaOH solution to potassium feldspar power is (4:1) to (6:1); acidizing is carried out after reaction, so as to obtain a mother liquid containing potassium; purified sodium carbonate and potassium carbonate products are obtained after acidizing, filtering, and evaporative crystallization are conducted on the mother liquid. The reaction temperature is 145 to 210 DEG C; the potassium dissolution rate is higher than 98 percent. The method for extracting soluble potassium from potassium feldspar has the advantages that the defects in the conventional process are overcome; potassium, aluminum and silicon in potassium feldspar are comprehensively utilized; the energy consumption is low; the process is simple; environmental pollution is avoided; a new way for decomposing and deep processing of middle-low grade potassium feldspar is found.

Description

technical field [0001] The invention belongs to the technical field of mineral resource processing and preparation of inorganic metal compounds, and in particular relates to a method for preparing potassium carbonate by processing potassium feldspar ore under normal pressure using a sub-molten salt method. Background technique [0002] Potassium feldspar is a potassium-containing aluminosilicate mineral (KAlSi 3 o 8 ), is the general term for three homogeneous polymorphic variants, sanidine, orthoclase and microcline, theoretically containing K 2 O 16.9%, SiO 2 64.7%, Al 2 o 3 18.4%. Potassium feldspar resources in my country are mainly distributed in 23 provinces including Anhui, Inner Mongolia, Heilongjiang, Xinjiang, Sichuan, and Shanxi. Currently, more than 60 sources of potassium feldspar have been reported, with reserves of about 7.914 billion tons, converted according to the average content Potassium oxide reserves are about 920 million tons. [0003] Potassium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D7/00
Inventor 童跃进王颖彭茂钦黄金凤彭功权郭菊花关怀民
Owner FUJIAN NORMAL UNIV
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