Method for preparing picromerite from mixed salt

A technology of langbeinite and mixed salt, which is applied in the field of salt chemical industry, can solve the problems of high energy consumption, large floor area, and low production efficiency, and achieve the effects of simple process, low energy consumption, and low cost

Active Publication Date: 2018-12-21
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The method uses mixed salt as a raw material, through the appropriate particle composition in the mixed salt, and through conversion and sieving processes to prepare langbeinite, which solves the problems of high energy consumption, large floor space and low production

Method used

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  • Method for preparing picromerite from mixed salt
  • Method for preparing picromerite from mixed salt

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The first step, crushing and screening

[0029] The 500g composition (wt%) is: K + 9.88%, Mg 2+ 8.12%, Na + 6.66%, SO 4 2- 29.52%, Cl - 21.5%, H 2 O 24.33% of the raw materials are crushed, and the mixed salt particle size is controlled at 20 mesh;

[0030] The second step, the transformation section

[0031] The raw material mixed salt and the washing water obtained through configuration are made into a slurry, and the percentage concentration of ions contained in the washing water component is: K + =2.30, Ca 2+ =0.09, Mg 2+ =1.44, SO 4 2- =6.03, Cl -=5.42, Na + =2.22, according to the water content in the washing water is 55% of the raw material mixed salt quality and puts into back washing water 374.2g, under the condition of 24 ℃, stir and transform for 30 minutes;

[0032] The third step, wet sieving, separates kobeinite

[0033] The slurry obtained after conversion is carried out to wet screening, and the mode of conversion mother liquor is sprinkle...

Embodiment 2

[0041] The first step, crushing and screening

[0042] The 1000g composition (wt%) is: K + 10.38%, Mg 2+ 8.62%, Na + 7.16%, SO 4 2- 28.36%, Cl - 25.0%, H 2 O 24.83% of the raw materials are crushed, and the mixed salt particle size is controlled at 40 mesh;

[0043] The second step, the transformation section

[0044] The raw material mixed salt and washing water are made into a slurry, and the percentage concentration of ions contained in the washing water component is: K + =2.59, Ca 2+ =0.14, Mg 2+ =1.49, SO 4 2- =6.55, Cl - =5.79, Na + = 2.39, put 775.0 g of backwash water into the raw material mixed salt, and stir for 30 minutes at 26° C.;

[0045] The third step, wet sieving, separates kobeinite

[0046] The slurry obtained after conversion is carried out to wet screening, and the mode of conversion mother liquor is sprinkled (the percentage concentration of ion contained in this conversion mother liquor is: K + =2.24%, Ca 2+ =0.16%, Mg 2+ =4.61%, Na + ...

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Abstract

The invention provides a method for preparing picromerite from a mixed salt. According to the method for preparing the picromerite from the mixed salt, by using the mixed salt as a raw material and using appropriate ion composition in the mixed salt, the picromerite is prepared through transformation and screening processes; problems that the energy consumption is high, the floor space is large, the production efficiency is low, a flotation agent is easily mixed in a product and so on in the prior art are solved; and meanwhile, the potassium ion recovery rate of the process can reach 68% or above; and the production of each ton of picromerite only consumes 2.5-3.5 tons of mixed salts. The mixed salt comprises the components of 9.38-10.38% of K<+>, 7.62-8.62% of Mg<2+>, 6.16-7.16% of Na<+>,29.02-30.02% of SO4<2->, 21.00-31.00% of Cl<-> and 23.83-24.83% of H2O according to the weight percentage.

Description

technical field [0001] The invention relates to the preparation of langbeinite, in particular to a method for preparing langbeinite by using mixed salts, and belongs to the technical field of salt chemical industry. Background technique [0002] Kobeinite, molecular formula K 2 Mg(SO 4 ) 2 ·6H 2 O, is the main raw material for the production of potassium magnesium sulfate fertilizer in China. Compared with traditional potassium sulfate products, potassium magnesium sulfate fertilizer has added magnesium element, 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 langbeinite production process. At present, the production methods of langbeinite introduced by domestic patents mainly include: Patent CN87103934A provides a method for directly producing lenbeinite by using evaporative crystallization and using sulfate-type salt lake brine as raw mat...

Claims

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Application Information

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IPC IPC(8): C01D5/12
CPCC01D5/12C01P2006/80
Inventor 袁俊生李非赵颖颖刘杰郭小甫魏华春
Owner HEBEI UNIV OF TECH
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