Preparation method of calcium magnesium ammonium nitrate

A technology of calcium and magnesium ammonium nitrate and ammonium nitrate is applied in the field of preparation of calcium and magnesium ammonium nitrate, can solve problems such as unfavorable large-scale production, high cost, environmental hazards, etc., and achieves solutions to land occupation and environmental pollution, good economic benefits, The effect of improving utilization

Inactive Publication Date: 2018-07-13
GUIZHOU BATIAN ECOTYPIC ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process will produce a lot of waste residue when preparing calcium magnesium nitrate from waste liquid, and the waste liquid is not fully utilized, so it may cause certain harm to the environment, and the preparation process is complicated and time-consuming. High cost, not conducive to mass production

Method used

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  • Preparation method of calcium magnesium ammonium nitrate
  • Preparation method of calcium magnesium ammonium nitrate

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preparation example Construction

[0028] A kind of preparation method of ammonium nitrate calcium magnesium that the embodiment of the present invention provides, comprises the following steps:

[0029] Step 1: Calcining and crushing medium and low-grade phosphate rocks in sequence, and then adding the crushed medium and low-grade phosphate rocks to a solution containing ammonium nitrate and nitric acid for leaching and pressure filtration to obtain demagnesified phosphate concentrate and leachate;

[0030] First, the medium and low-grade phosphate rocks are sequentially calcined and crushed and then added to a solution containing ammonium nitrate and nitric acid. The ammonium nitrate and nitric acid solution reacts with the calcium oxide and magnesium oxide in the medium and low-grade phosphate rocks to form Magnesium nitrate, calcium ammonium nitrate and magnesium ammonium nitrate leaching solution, while the phosphorus in the middle and low grade phosphate rock still exists in the form of calcium fluorophos...

Embodiment 1

[0051] Take 40kg of medium and low-grade phosphate rock, and sequentially calcine and crush the medium and low-grade phosphate rock. During the calcination process, the calcination temperature is 900°C and the calcination time is 3h. The particle size of the crushed medium-low grade phosphate rock is 0.1-0.8mm. Then add the broken medium and low-grade phosphate rock into 20kg of solution containing ammonium nitrate and nitric acid for leaching. The mass ratio of ammonium nitrate and nitric acid is 4:1. During the leaching process, the leaching temperature is 65°C. The leaching time is 2.5 hours, and the pH value of the leaching solution is 4.0. After leaching, press filter, wash, and dry to obtain demagnesium phosphorus concentrate and leaching solution.

[0052] The leaching solution is concentrated and spray-dried in sequence to obtain powdered ammonium calcium magnesium nitrate. During the concentration process, the concentration temperature is 170° C., and the concentrat...

Embodiment 2

[0058] Take 40kg of medium and low-grade phosphate rock, and sequentially calcine and crush the medium and low-grade phosphate rock. During the calcination process, the calcination temperature is 920°C and the calcination time is 3h. The particle size of the crushed medium-low grade phosphate rock is 0.2-0.7mm. Then add the broken medium and low-grade phosphate rock to 12kg of solution containing ammonium nitrate and nitric acid for leaching. The mass ratio of ammonium nitrate and nitric acid is 3:1. During the leaching process, the leaching temperature is 75°C. The leaching time is 1 hour, and the pH value of the leaching solution is 5.5. After leaching, press filter, wash, and dry to obtain demagnesium phosphorus concentrate and leaching solution.

[0059] The leaching solution is concentrated and spray-dried in sequence to obtain powdered ammonium calcium magnesium nitrate. During the concentration process, the concentration temperature is 180°C, and the concentration tim...

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Abstract

The invention provides a preparation method of calcium magnesium ammonium nitrate. The preparation method comprises the following steps: sequentially calcining and crushing medium-low-grade phosphorite, adding the crushed medium-low-grade phosphorite into a solution containing ammonium nitrate and nitric acid, carrying out leaching and filter pressing to obtain magnesium-removed phosphate concentrate and a leach liquor; carrying out concentrating and spray drying on the leach liquor in sequence to obtain powdery calcium magnesium ammonium nitrate; and adding an ammonium nitrate melt into the powdery calcium magnesium ammonium nitrate, carrying out first mixing, and then carrying out high-tower or slurry-spraying granulation on the ammonium nitrate melt and powdery calcium magnesium ammonium nitrate subjected to the fist mixing to obtain granular calcium magnesium ammonium nitrate. According to the preparation method, calcium and magnesium elements can be effectively separated from themedium-low-grade phosphorite by utilizing ammonium nitrate and nitric acid, and through the addition of the ammonium nitrate melt and the granulation, the granular calcium magnesium ammonium nitrate is finally obtained. The preparation method provided by the invention has simple process, high utilization rate of the leach liquor and no generation of waste residues.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical industry, and in particular relates to a preparation method of calcium magnesium ammonium nitrate. Background technique [0002] my country is rich in phosphate rock resources, but most of them are medium and low-grade phosphate rock. A lot of waste liquid and waste residue will be produced when using low-grade phosphate rock to extract phosphate concentrate. The preparation of calcium magnesium ammonium nitrate from waste liquid is a commonly used technology at present. When calcium magnesium ammonium nitrate is used in the field of fertilizer, it is widely loved by consumers because it has a better effect on plants than single calcium fertilizer and magnesium fertilizer. , so the technology of preparing calcium and magnesium ammonium nitrate from waste liquid has received more and more attention and research in the fertilizer industry. [0003] In the existing technology, the patent...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05C13/00C05G5/00
CPCC05C1/00C05G5/12C05C5/00C05C5/04
Inventor 方进顾春光任光耀黄仕英
Owner GUIZHOU BATIAN ECOTYPIC ENG CO LTD
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