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Method for preparing large-particle picromerite

A technology of magnesite and large particles, applied in the field of salt chemical industry, can solve the problems of easy agglomeration in drying, difficult separation of fine-grain magnesite, etc., and achieves the effects of high yield, low energy consumption and simple principle

Active Publication Date: 2013-12-04
HEBEI UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The present invention prepares large-grained langbeinite, which solves the problems that fine-grained langbeinite is not easy to separate, dry and easy to agglomerate, and at the same time, the recovery rate of potassium ions in the process can reach more than 80%.

Method used

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  • Method for preparing large-particle picromerite
  • Method for preparing large-particle picromerite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The first step, pulping

[0025] Set the composition (mass percent) as: K + 19.00%, Mg 2+ 7.00%, Na + 0.80%, SO 4 2- 47.00%, Cl - 1.50% of the crude product of magnesite (the remaining components are water, and 1 to 2% of solid insoluble matter; the crude product is powder, with a particle size of less than 200 μm) and water in a mass ratio of 1:0.30 to prepare a slurry. The material temperature is controlled at 50℃;

[0026] The second step is to crystallize

[0027] The slurry obtained in the first step is continuously put into the mother liquor under the condition of 20°C in the continuous crystallizer, the temperature in the crystallizer is controlled to be kept at 20°C, and the mass ratio of Magnesite to the mother liquor in the crystallizer is controlled at 1:3 , and ensure that the injected slurry can have a residence time of 0.5 hours in the crystallizer, and the mass percentage concentration of ions contained in the composition of the mother liquor is: K...

Embodiment 2

[0035] The first step, pulping

[0036] Set the composition (mass percent) as: K + 17.08%, Mg 2+ 5.72%, Na + 1.67%, SO 4 2- 41.97%, Cl - 3.36% of the crude product of magnesite and water are prepared into a slurry in a mass ratio of 1:0.35, and the temperature of the slurry is controlled at 60°C;

[0037] The second step is to crystallize

[0038] The slurry obtained in the first step is continuously put into the mother liquor under the condition of 25°C in the continuous crystallizer, the temperature in the crystallizer is controlled to be kept at 25°C, and the mass ratio of Magnesite to the mother liquor in the crystallizer is controlled at 1:4.5 , and ensure that the injected slurry can have a residence time of 2.5 hours in the crystallizer, and the mass percentage concentration of ions contained in the composition of the mother liquor is: K + =4.59%, Mg 2+ =2.30%, Na + =1.60%, Cl - =4.75% and SO 4 2- =11.77%;

[0039] The third step, centrifugal separation

...

Embodiment 3

[0045] first step,

[0046] The composition (mass percentage) is: K + 16.00%, Mg 2+ 5.00%, Na + 2.00%, SO 4 2- 39.00%, Cl - 4.00% crude langbeinite and water are configured into a slurry at a mass ratio of 1:0.50, and the temperature of the slurry is controlled at 70°C;

[0047] The second step, cooling and crystallization

[0048] The slurry prepared in the first step is continuously put into the mother liquor at 30°C in the continuous crystallizer, the temperature in the crystallizer is kept at 30°C, and the mass ratio of kolinite and mother liquor in the crystallizer is controlled at 1:6 , and ensure that the slurry dropped into can have a residence time of 5 hours in the crystallizer, and the mass percent concentration of ions contained in the composition of the mother liquor is: K + =4.00%, Mg 2+ =2.00%, Na + =2.50%, Cl - =6.00% and SO 4 2- =11.00%;

[0049] The third step, centrifugation

[0050] The large-grain langbeinite obtained in the second step of crys...

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Abstract

The invention relates to a method for preparing a large-particle picromerite from picromerite crude product. The method comprises the following steps: taking picromerite crude product gained through flotation as raw materials, and through a crystal transformation step of reducing the temperature from 50-70 DEG C to 20-30 DEG C, enabling compound leonite with four crystal water (or langbeinite without crystal water) to be changed into compound picromerite with six crystal water. The particle diameter of the prepared large particle picromerite can reach 620.5 micrometers to the maximal extent, the problem that fine particle picromerite is not easy to separate and dry and easy to agglomerate is solved, and meanwhile the potassium ion recovery ratio in the technology can reach above 80 %.

Description

technical field [0001] The invention relates to the preparation of large-grain magnesite, in particular to a method for preparing large-grain magnesite by using powdered magnesite, and belongs to the technical field of salt chemical industry. Background technique [0002] Magnesite, molecular formula K 2 Mg(SO 4 ) 2 ·6H 2 O is a multi-component fertilizer and the main raw material for the production of potassium sulfate fertilizer. Compared with traditional potassium sulfate products, potassium-magnesium sulfate fertilizer has added magnesium, which can provide more comprehensive nutrition for crops, so its use has become more and more extensive. It is of great significance to develop a high-efficiency and energy-saving process for the production of large-grained magnesite. At present, the production method patents related to Magnesite mainly include: Patents CN87103934A, CN1038252A, CN1038799A, CN1076435A, CN1236734A, CN1724374A, CN101318844A, CN101481265A, etc., but t...

Claims

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Application Information

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IPC IPC(8): C01D5/12
Inventor 袁俊生何茂雄李非凌萍王军马林纪志永王士钊刘杰魏华春郭小甫杨超鹏张林栋
Owner HEBEI UNIV OF TECH
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