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Method for efficiently releasing potassium from acid-leached illite by aid of microwaves

A microwave-assisted, illite technology, applied in the field of comprehensive utilization of illite resources, can solve the problems of high energy consumption and long cycle, and achieve the effect of wide source and shortened temperature and time.

Active Publication Date: 2018-08-17
YANBIAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects of large energy consumption or long cycle for extracting potassium from water-insoluble potassium resources in the prior art, and provide a high-efficiency, low-temperature potassium extraction technology

Method used

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  • Method for efficiently releasing potassium from acid-leached illite by aid of microwaves
  • Method for efficiently releasing potassium from acid-leached illite by aid of microwaves

Examples

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Embodiment 1

[0023] A method for efficiently releasing potassium from microwave-assisted acid leaching illite, comprising the following steps:

[0024] (1), after the illite raw ore is flotation-removed, it is ground to powder;

[0025] (2), 5moL / L hydrochloric acid and illite powder are uniformly mixed in a certain proportion, wherein, the solid-liquid ratio of illite and hydrochloric acid is 1:4.5mL / g;

[0026] (3), put the mixed material into a microwave hydrothermal digestion instrument, and irradiate it for 30 minutes at a system temperature of 170°C;

[0027] (4), take out the reacted material, suction filter to neutrality, test the silicon dioxide component and potassium extraction rate in the residue, the silicon dioxide purity is 95.4% (the iron content is 0.2%), and the illite potassium release rate reached 92.1%;

[0028] (5), after the filtrate obtained in the step (4) is evaporated and concentrated, ethanol is added, and the potassium chloride product with a purity greater t...

Embodiment 2

[0030] A method for efficiently releasing potassium from microwave-assisted acid leaching illite, comprising the following steps:

[0031] (1), after the illite raw ore is flotation-removed, it is ground to powder;

[0032] (2), uniformly mix 3moL / L sulfuric acid and illite powder in a certain proportion, wherein, the solid-liquid ratio of illite and sulfuric acid is 1:10mL / g;

[0033] (3), put the mixed material into a microwave hydrothermal digestion apparatus, and irradiate it for 15 minutes at a system temperature of 160°C;

[0034] (4), take out the reacted material, suction filter to neutrality, test the silicon dioxide component and potassium extraction rate in the residue, the silicon dioxide purity in the solid is 94.1% (the iron content is 0.2%), and the illite released Potassium rate reaches 90.7%;

[0035] (5), after the filtrate gained in the step (4) is evaporated and concentrated, ethanol is added, and the potassium chloride product with a purity of more than ...

Embodiment 3

[0037] A method for efficiently releasing potassium from microwave-assisted acid leaching illite, comprising the following steps:

[0038] (1), after the illite raw ore is flotation-removed, it is ground to powder;

[0039] (2) Uniformly mix 10moL / L nitric acid and illite powder in a certain proportion, wherein the solid-to-liquid ratio of illite and salt nitric acid is 1:1mL / g;

[0040] (3), put the mixed material into a microwave hydrothermal digestion apparatus, and irradiate for 5 minutes at a system temperature of 190°C;

[0041] (4), take out the reacted material, suction filter to neutrality, test the silicon dioxide component and potassium extraction rate in the residue, the silicon dioxide purity in the solid is 95.2% (the iron content is 0.2%), and the illite released Potassium rate reached 91.4%;

[0042] (5), after the filtrate gained in the step (4) is evaporated and concentrated, ethanol is added, and the potassium chloride product with a purity of more than 85...

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Abstract

The invention discloses a method for efficiently releasing potassium from acid-leached illite by the aid of microwaves. The method includes the steps: (1) performing flotation and purification on illite raw ores and then grinding the illite raw ores into powder; (2) uniformly mixing acid and illite powder according to a certain proportion; (3) placing mixed materials into a microwave hydrothermaldigester and irradiating the materials at the system temperature of 120-190 DEG C for 5-30 minutes; (4) subsequently treating filtrate. The solid-to-liquid ratio of the illite to the acid is 1:(1-10)mL / g. Illite raw materials are wide in source, early-stage activation is omitted, potassium can be deeply released in an environment of microwave irradiation and acid leaching after flotation and purification, potassium releasing rate is higher than 90%, potassium dissolution rate reaches up to 98% in irradiation in a stepped interval progressive mode, high-purity white carbon black (purity is higher than 95% and iron content is lower than 0.5%) can be acquired by aluminum and iron removal, the average crystallization rate of potassium chloride crystals is 60%, and the purity of the potassium chloride crystals is 85%.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of illite resources, in particular to a method for efficiently releasing potassium from microwave-assisted acid leaching illite. Background technique [0002] China is a large agricultural country with 1.8 billion mu of arable land. According to the latest soil census report, 70% of the arable land in China is deficient in potassium. China's soluble potash resources are extremely short, with reserves of 457 million tons, accounting for only 2.6% of the world's reserves, and the self-sufficiency rate of potash fertilizers is less than 50%. Potassium fertilizer shortage has directly endangered my country's food security and economic development. However, the water-insoluble potassium resources represented by illite are extremely abundant in my country, and the total reserves of ore sources reported at present are more than 10 billion tons. Accelerating the research on the extraction techno...

Claims

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Application Information

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IPC IPC(8): C05D1/02C01B33/18
CPCC01B33/18C05D1/02
Inventor 姜男哲孟万历新宇
Owner YANBIAN UNIV
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