Magnesium calcium ammonium nitrate granular fertilizer and preparation method thereof

A technology of ammonium nitrate, calcium and magnesium, granular fertilizer, applied in the direction of ammonium nitrate fertilizer, nitrate fertilizer, ammonium salt fertilizer, etc., can solve the problems of underutilization of resources, environmental groundwater pollution, etc.

Inactive Publication Date: 2019-10-08
GUIZHOU BATIAN ECOTYPIC ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, most of the leaching liquid in the domestic mineral processing process remains in the tailings and is backfilled to the mine, causing pollution to the environment and groundwater, and the resources have not been effectively utilized

Method used

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  • Magnesium calcium ammonium nitrate granular fertilizer and preparation method thereof
  • Magnesium calcium ammonium nitrate granular fertilizer and preparation method thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0030] The preparation method of the ammonium nitrate calcium magnesium granule fertilizer of one embodiment, comprises the steps:

[0031] Step S110: Prepare low-magnesium phosphorus concentrate with medium and low-grade phosphate rock as raw material, and obtain leaching solution. Wherein, the main component of above-mentioned leaching liquid comprises: Ca(NO 3 ) 2 , Mg(NO 3 ) 2 , NH 4 NO 3 , NH 4 OH and H 2 O.

[0032] It can be understood that the leaching solution in the above step S110 is based on low- and medium-grade phosphate rock as raw material, after calcination, digestion, and wet ball milling, the by-products when leaching and preparing low-magnesium phosphorus concentrate can be obtained from special phosphorus ore. It can be purchased from ore processing factories, and can also be prepared through the following steps:

[0033] Step S111: Crushing, calcining, and wet ball milling the medium and low-grade phosphate rock to obtain a pretreated product.

...

Embodiment 1

[0058] The ammonium nitrate calcium magnesium granule fertilizer of this implementation and preparation steps are as follows:

[0059] (1) The medium and low grade phosphate rock (P 2 o 5 25.12%) crushed to less than 4.0mm, calcined, cooled, ground to less than 0.5mm in particle size, digested, leached, and washed by pressure filtration to obtain 6000kg of leaching solution, which was pumped to the concentration system (two-effect countercurrent evaporator device). Enter the low-pressure steam of 0.69MPa, through the first concentrated treatment, obtain the first concentrated liquid;

[0060] (2) Pump the above-mentioned first concentrate to the preheater, use the condensate produced by 2.0MPa medium-pressure steam as the heating medium, transport it to the heat exchanger after preheating, and then transport it to the forced Circulating evaporator, and then mixed with the first concentrated liquid to be heated through a heat exchanger and lowered to 98°C to 102°C to obtain ...

Embodiment 2～4

[0064] The preparation steps of the ammonium calcium magnesium nitrate granule fertilizer in Examples 2-4 are the same as those in Example 1, only the process parameters involved are different. For the specific process parameters, please refer to Table 1 below.

[0065] The processing parameters when each embodiment of table 1 prepares ammonium nitrate calcium magnesium granule fertilizer

[0066]

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Abstract

The invention relates to a magnesium calcium ammonium nitrate granular fertilizer and a preparation method thereof. The method comprises the following steps: preparing a low-magnesium-phosphorus concentrate by using a medium and low grade phosphate ore as a raw material to obtain a leaching solution; performing concentration treatment on the leaching solution to obtain a concentrate; and performing granulation treatment on the concentrate to obtain the magnesium calcium ammonium nitrate granular fertilizer. The preparation method of the magnesium calcium ammonium nitrate granular fertilizer provided by the invention uses the low-magnesium-phosphorus concentrate by-product leaching solution prepared from the medium and low grade phosphate ore as a raw material to prepare the magnesium calcium ammonium nitrate granular fertilizer, and only needs concentration treatment and granulation treatment in the preparation process without other treatment steps or addition of other raw materials, thereby having a simple process and being easy to operate; no waste liquid and waste residues are generated in the whole production process, so that the method is green and environmentally friendly; and the granular magnesium calcium ammonium nitrate product with a particle pelletizing rate of >=90% and a smooth and round surface is obtained, and has the characteristics of full water solubility, full nutrition, fast fertilizer efficiency, and convenient transportation, storage and application.

Description

technical field [0001] The invention relates to the field of inorganic fertilizer production, in particular to an ammonium nitrate calcium magnesium granule fertilizer and a preparation method thereof. Background technique [0002] my country is rich in phosphate rock resources, but more than 90% of them are medium and low grade (P 2 o 5 The mass content is below 30%) phosphate rock. When extracting phosphate concentrate from low- and medium-grade phosphate rock, a lot of by-product leachate will be produced, and the leachate is represented by Ca(NO 3 ) 2 , Mg(NO 3 ) 2 , NH 4 NO 3 , NH 4 OH and H 2 O-based. [0003] At present, most of the leaching liquid in the domestic mineral processing process remains in the tailings and is backfilled into the mine, causing pollution to the environment and groundwater, and the resources have not been effectively utilized. Contents of the invention [0004] Based on this, it is necessary to provide a method for preparing ammo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05C13/00
CPCC05C1/00C05C3/00C05C5/00C05C5/04
Inventor 方进顾春光任光耀黄德明陈铭
Owner GUIZHOU BATIAN ECOTYPIC ENG CO LTD
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