Method for simultaneously preparing calcium sulfate, potassium nitrate, potassium magnesium nitrate and magnesium carbonate from calcium magnesium ammonium nitrate liquid

A technology of ammonium, calcium and magnesium nitrate and potassium and magnesium nitrate is applied in the field of chemical industry, and can solve the problems of effective utilization of magnesium and calcium separated elements, and achieve the effect of improving the utilization rate.

Pending Publication Date: 2021-05-14
GUIZHOU BATIAN ECOTYPIC ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] But at present, as a by-product, it has not effectively separated the magnesium and calcium elements so that the corresponding elements can be effectively used

Method used

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  • Method for simultaneously preparing calcium sulfate, potassium nitrate, potassium magnesium nitrate and magnesium carbonate from calcium magnesium ammonium nitrate liquid

Examples

Experimental program
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Effect test

Embodiment 1

[0061] Present embodiment proposes a kind of ammonium nitrate calcium magnesium solution and prepares the method for calcium sulfate, potassium nitrate, potassium magnesium nitrate and magnesium carbonate simultaneously, comprises the following steps:

[0062] The potassium sulfate solution with a concentration of 20wt% and the ammonium nitrate calcium magnesium solution with a concentration of 25wt% are in a mass ratio of 1:1, and the decalcification reaction is carried out at 80° C. for 4 hours, and filtered in a filter to obtain the decalcification solution and potassium sulfate.

[0063] Wash (one wash) the potassium sulfate after the above-mentioned filtration with water for the first time, and the lotion (one lotion) after one wash is used as the solvent of the next batch of calcium sulfate, and the solid phase is carried out with water for the second time after one wash. Washing (secondary washing), the washing liquid after the second washing (secondary washing liquid) i...

Embodiment 2

[0069] Present embodiment proposes a kind of ammonium nitrate calcium magnesium solution and prepares the method for calcium sulfate, potassium nitrate, potassium magnesium nitrate and magnesium carbonate simultaneously, comprises the following steps:

[0070] The potassium sulfate solution with a concentration of 35wt% and the ammonium nitrate calcium magnesium solution with a concentration of 28wt% are in a mass ratio of 3:5, and the decalcification reaction is carried out at 110° C. for 3 hours, and filtered in a filter to obtain the decalcification solution and potassium sulfate.

[0071] Wash (one wash) the potassium sulfate after the above-mentioned filtration with water for the first time, and the lotion (one lotion) after one wash is used as the solvent of the next batch of calcium sulfate, and the solid phase is carried out with water for the second time after one wash. Washing (secondary washing), the washing liquid after the second washing (secondary washing liquid) ...

Embodiment 3

[0077] Present embodiment proposes a kind of ammonium nitrate calcium magnesium solution and prepares the method for calcium sulfate, potassium nitrate, potassium magnesium nitrate and magnesium carbonate simultaneously, comprises the following steps:

[0078] The potassium sulfate solution with a concentration of 50wt% and the ammonium nitrate calcium magnesium solution with a concentration of 32wt% are in a mass ratio of 5:7, and the decalcification reaction is carried out at 20°C for 6 hours, and filtered in a filter to obtain the decalcification solution and potassium sulfate.

[0079] Wash (one wash) the potassium sulfate after the above-mentioned filtration with water for the first time, and the lotion (one lotion) after one wash is used as the solvent of the next batch of calcium sulfate, and the solid phase is carried out with water for the second time after one wash. Washing (secondary washing), the washing liquid after the second washing (secondary washing liquid) is ...

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Abstract

The invention discloses a method for simultaneously preparing calcium sulfate, potassium nitrate, potassium magnesium nitrate and magnesium carbonate from calcium magnesium ammonium nitrate liquid, and belongs to the technical field of chemical engineering. The method comprises the following steps: carrying out a decalcification reaction on a potassium sulfate solution and a calcium magnesium ammonium nitrate solution, adding an alkaline substance to carry out a neutralization reaction, and carrying out first solid-liquid separation to obtain a decalcified solution and calcium sulfate; concentrating and crystallizing the decalcified solution, and carrying out secondary solid-liquid separation to obtain crystallized mother liquor and potassium nitrate; carrying out magnesium precipitation reaction on the crystallization mother liquor, an ammonium bicarbonate solution and gas ammonia, and carrying out third solid-liquid separation to obtain a magnesium precipitation liquid and magnesium carbonate. and concentrating and granulating the magnesium precipitation liquid to obtain potassium magnesium nitrate. According to the method, calcium sulfate, potassium nitrate, potassium magnesium nitrate and magnesium carbonate can be effectively separated from the chemical ore byproduct ammonium calcium magnesium nitrate solution at the same time, the utilization rate of the ammonium calcium magnesium nitrate solution is increased, and calcium and magnesium elements contained in the ammonium calcium magnesium nitrate solution are recycled.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for simultaneously preparing calcium sulfate, potassium nitrate, potassium magnesium nitrate and magnesium carbonate from an ammonium nitrate calcium magnesium solution. Background technique [0002] Calcium ammonium nitrate liquor is a by-product of chemical beneficiation (phosphate concentrate), which contains approximately 6.2 wt% magnesium, 13.3 wt% nitrogen and 15.3 wt% calcium. Calcium magnesium nitrate is weakly acidic (pH value about 6.5) after dissolving, suitable for mixing with most agrochemicals. [0003] But at present, as a by-product, it has not effectively separated the magnesium and calcium elements so that the corresponding elements can be effectively used. [0004] In view of this, the present invention is proposed. Contents of the invention [0005] The object of the present invention is to provide a method for preparing calcium sulfate,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01D5/16C01D9/08C01F5/00C01F5/24C01F11/46
CPCC01D5/16C01F11/46C01D9/08C01F5/24C01F5/00C01P2006/80
Inventor 方进孟品品顾春光黄德明
Owner GUIZHOU BATIAN ECOTYPIC ENG CO LTD
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