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Preparation method of large-particle potassium magnesium sulfate crystals and small-particle potassium magnesium sulfate crystals

A technology of potassium magnesium sulfate and small particles, which is applied in the direction of bisulphate preparation, sulfate/bisulfate preparation, potash fertilizer, etc. It can solve the problems of increased manufacturing cost and reduced nutrient content, so as to reduce costs and improve production efficiency. Effect

Inactive Publication Date: 2018-04-24
LOMON LAND AGRI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This granulation method reduces the nutrient content by 2% to 5%, and increases the manufacturing cost by 300 yuan / ton

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 100g of potassium bisulfate and add it to a 500ml beaker placed in a constant temperature water bath at 40°C, then add 300g of water, then add 40g of 50% magnesium hydroxide slurry, wait for about 30 minutes to react, and check that the pH value is 6. Stop heating, filter and separate while it is hot, and keep the filter residue in a constant temperature oven at 50°C for 2 hours to obtain small crystals. Granular crystals, the crystal particle size reaches 2mm-4.75mm, and the filtrate is returned to step 1) to mix potassium hydrogensulfate solution.

[0021] After the above-mentioned products were analyzed by XRD, the small particles matched with the potassium sulfate standard card, and the large particles matched with the potassium magnesium sulfate standard card, wherein the K in the potassium sulfate O content was 53.4%, and the K in the potassium magnesium sulfate 2 O content 24.0%, MgO content 9.3%, SO 3 The content is 40.5%.

Embodiment 2

[0023] Weigh 180g of potassium hydrogen sulfate and add it to a 500ml beaker placed in a constant temperature water bath at 50°C, then add 220g of water, and then add 70g of magnesium hydroxide with a concentration of 50%, wait for about 30 minutes to react, and check that the pH value is 6. Stop heating, filter and separate while it is hot, and keep the filter residue in a constant temperature oven at 50°C for 2 hours to obtain small crystals. Granular crystals, the crystal particle size reaches 2mm-4.75mm, and the filtrate is returned to step 1) to mix potassium hydrogensulfate solution.

[0024] After the above-mentioned products were analyzed with XRD, the small particles matched with the potassium sulfate standard card, and the large particles matched with the potassium magnesium sulfate standard card, wherein K in potassium sulfate 2 O content is 51.6%, K in potassium magnesium sulfate 2 O content 24.1%, MgO content 9.9%, SO 3 The content is 40.0%.

Embodiment 3

[0026] Weigh 260g of potassium hydrogen sulfate and add it to a 500ml beaker placed in a constant temperature water bath at 60°C, then add 140g of water, and then add 115g of 50% magnesium hydroxide, wait for about 30 minutes to react, and check that the pH value is 7. Stop heating, filter and separate while it is hot, and keep the filter residue in a constant temperature oven at 50°C for 2 hours to obtain small crystals. Granular crystals, the crystal particle size reaches 2mm-4.75mm, and the filtrate is returned to step 1) to mix potassium hydrogensulfate solution.

[0027] After the above-mentioned products were analyzed with XRD, the small particles matched with the potassium sulfate standard card, and the large particles matched with the potassium magnesium sulfate standard card, wherein K in potassium sulfate 2 O content is 51.3%, of which K in potassium magnesium sulfate 2 O content 23.4%, MgO content 10.1%, SO 3 The content is 40.5%.

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Abstract

The invention relates to a preparation method of large-particle potassium magnesium sulfate crystals and small-particle potassium magnesium sulfate crystals. The preparation method includes followingsteps: 1), preparing a hot potassium hydrogen sulfate solution of 25-65wt% in concentration; 2), slowly adding the potassium hydrogen sulfate solution in the step 1) into magnesia or magnesium hydroxide for neutralizing, and holding temperature to obtain hot mixed liquid, wherein the end point of neutralizing is when pH is 6-8; 3), performing solid-liquid separation on the mixed liquid to obtain small-particle potassium sulfate crystals and primary filtrate; 4), performing cooling crystallization and solid-liquid separation on the primary filtrate to obtain large-particle potassium magnesium sulfate crystals and secondary filtrate. Preparation of the large-particle potassium magnesium sulfate crystals is realized by controlling concentration of raw materials and determination of the end point of neutralizing, high-quality potassium magnesium sulfate with granularity reaching 2-4.75mm can be obtained directly, and cost for granulation is reduced.

Description

technical field [0001] The invention relates to a method for preparing large-grain potassium magnesium sulfate crystals and small-grain potassium sulfate crystals, belonging to the technical field of chemical fertilizer production. Background technique [0002] In recent years, mechanical fertilization has been widely prevalent. In order to improve fertilization operations and adapt to mechanical fertilization, chemical fertilizer products need to have a particle size that meets the requirements and have good fluidity during mechanized fertilization. At present, chemical fertilizer granulation method is widely used to prepare granular products with particle size meeting the required range. [0003] Potassium magnesium sulfate is a kind of compound potassium fertilizer containing magnesium, sulfur and other medium and trace elements, which is made by physical extraction or direct removal of impurities from salt lake brine or solid potassium magnesium ore. The chemical formula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/12C01D5/02C05D1/00
Inventor 席海红张玉荣周春勇吴疆何丰王永红陈开明
Owner LOMON LAND AGRI
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