Method for producing monoammonium phosphate and magnesium ammonium phosphate with wet concentrated phosphoric acid slag acid

A technology of monoammonium phosphate and phosphoric acid residue, applied in the chemical industry, can solve the problems of low economic value, affecting product quality, conventional product backlog, etc., and achieve the effect of simplifying the treatment process, high added value, and improving the recovery rate

Active Publication Date: 2015-11-18
昆明隆祥化工有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In the production process of ammonium phosphate produced by the concentration method, a considerable amount of concentrated phosphoric acid slag acid will be produced. The slag content of the phosphoric acid slag acid is relatively high, and the water-insoluble phosphorus is also very high. Therefore, most of the existing technologies can only use phosphoric acid Using slag acid to produce low-value conventional fertilizers such as heavy superphosphate, rich superphosphate or agricultural grade ammonium nitrate, not only produces low economic value, but also causes a large backlog of such conventional products
If the phosphoric acid slag acid is used to directly produce ammonium phosphate with the existing technology, the quality of the product will be seriously affected

Method used

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  • Method for producing monoammonium phosphate and magnesium ammonium phosphate with wet concentrated phosphoric acid slag acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A, get 3000 grams of wet concentrated phosphoric acid slag acid from a phosphate fertilizer factory (wherein: P 2 o 5 43.04%; F1.99%; SO 3 6.65%; CaO3.15%; MgO2.12%; Fe 2 o 3 3.30%; AL 2 o 3 2.21%; solid content 2.20%), add 3000 grams of water and stir to dilute, stir well and let it settle for 24 hours. Siphon to obtain 4165 grams of clarified dilute acid, and the sedimentation residue at the bottom is reserved for future use.

[0041]B. Slowly add 21 grams of industrial grade sodium carbonate to the clarified dilute acid obtained in step A, fully react for 1 hour under normal temperature stirring, and then filter and separate the filtrate and filter residue, wash the filter residue with water until it is acid-free, and then dry it to obtain 21 grams Sodium fluorosilicate products (Na 2 SiF 6 content 95.10%), the washing water was incorporated into the defluorophosphoric acid filtrate to obtain 4185 grams of defluorophosphoric acid dilute;

[0042] C, get 3315...

Embodiment 2

[0050] A, get 3000 grams of wet concentrated phosphoric acid slag acid from a phosphate fertilizer factory (wherein: P 2 o 5 43.04%; F1.99%; SO 3 6.65%; CaO3.15%; MgO2.12%; Fe 2 o 3 3.30%; AL 2 o 3 2.21%; solid content 2.20%), add 3000 grams of water and stir to dilute, stir well and let it settle for 24 hours. Siphon to obtain 4165 grams of clarified dilute acid, and the sedimentation residue at the bottom is reserved for future use.

[0051] B. In the clarified dilute acid obtained in step A, slowly add 16 grams of industrial grade sodium hydroxide, fully react for 1 hour under normal temperature stirring, filter and separate the filtrate and filter residue, wash the filter residue with water until it is acid-free, and then dry it to obtain 21 Grams of sodium fluorosilicate products (Na 2 SiF 6 content 95.02%), the washing water was incorporated into the defluorophosphoric acid filtrate to obtain 4192 grams of defluorophosphoric acid dilute;

[0052] C, get 3370 gra...

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Abstract

The invention provides a method for producing monoammonium phosphate and magnesium ammonium phosphate by using wet concentrated phosphoric acid residues. According to the method, concentrated phosphoric acid residues are adopted as raw materials and sodium fluorosilicate, industrial monoammonium phosphate and magnesium ammonium phosphate are respectively obtained through the processes of dilution and sedimentation, defluorination, fractional multistep neutralization, concentration and crystallization, primary mother liquor pH value adjustment, size mixing of filter cake and secondary mother liquor, magnesia powder neutralization and the like. The method is little in equipment investment, low in production cost and good in product quality and has the advantages that the problem that acid residues of ammonium phosphate plants can be only used for producing low value-added products is solved and the low-cost industrial monoammonium phosphate slow release fertilizer magnesium ammonium phosphate with high quality and inexpensive can be obtained.

Description

technical field [0001] The invention relates to a method for producing monoammonium phosphate and magnesium ammonium phosphate, in particular to a method for producing industrial-grade monoammonium phosphate and industrial-grade and agricultural-grade magnesium ammonium phosphate by using wet concentrated phosphoric acid slag acid, which belongs to the technical field of chemical industry. Background technique [0002] In the production process of ammonium phosphate produced by the concentration method, a considerable amount of concentrated phosphoric acid slag acid will be produced. The slag content of the phosphoric acid slag acid is relatively high, and the water-insoluble phosphorus is also very high. Therefore, most of the existing technologies can only use phosphoric acid Using slag acid to produce low-value conventional fertilizers such as heavy superphosphate, rich superphosphate or agricultural grade ammonium nitrate, not only produces low economic value, but also ca...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/28C01B25/45
Inventor 马健李庆
Owner 昆明隆祥化工有限公司
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