Method for producing monoammonium phosphate and magnesium ammonium phosphate by using wet concentrated phosphoric acid residues

A technology of monoammonium phosphate and phosphoric acid residue acid, applied in the chemical industry, can solve the problems of conventional product backlog, low economic value, affecting product quality, etc., and achieve high added value and good economic benefits.

Active Publication Date: 2014-09-24
昆明隆祥化工有限公司
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  • Abstract
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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 p

Method used

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  • Method for producing monoammonium phosphate and magnesium ammonium phosphate by using wet concentrated phosphoric acid residues

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A. Take 3000 grams of wet concentrated phosphoric acid residue from a phosphate fertilizer factory (including: P 2 O 5 43.04%; F1.99%; SO 3 6.65%; CaO 3.15%; MgO 2.12%; Fe 2 O 3 3.30%; AL 2 O 3 2.21%; 2.20% solids), add 3000 grams of water, stir and dilute, stir well and let it settle for 24 hours. 4165 grams of clear dilute acid was obtained by siphoning, and the sedimentation residue at the bottom was left for use.

[0041]B. In the clarified dilute acid obtained in step A, slowly add 21 grams of technical-grade sodium carbonate, fully react under normal temperature stirring for 1 hour, filter and separate the filtrate and filter residue, wash the filter residue with water to no acidity, and dry to obtain 21 grams Sodium Fluorosilicate Products (Na 2 SiF 6 content 95.10%), the washing water was incorporated into the defluorinated phosphoric acid filtrate to obtain 4185 grams of defluorinated dilute phosphoric acid;

[0042] C, get 3315 grams of defluorina...

Embodiment 2

[0051] A. Take 3000 grams of wet concentrated phosphoric acid residue from a phosphate fertilizer factory (including: P 2 O 5 43.04%; F1.99%; SO 3 6.65%; CaO 3.15%; MgO 2.12%; Fe 2 O 3 3.30%; AL 2 O 3 2.21%; 2.20% solids), add 3000 grams of water, stir and dilute, stir well and let it settle for 24 hours. 4165 grams of clear dilute acid was obtained by siphoning, and the sedimentation residue at the bottom was reserved for use.

[0052] B, in the clarified dilute acid obtained in step A, slowly add 16 grams of technical grade sodium hydroxide, fully react under normal temperature stirring for 1 hour, filter and separate the filtrate and the filter residue, wash the filter residue with water to no acidity, and dry to obtain 21 grams of sodium fluosilicate products (Na 2 SiF 6 content 95.02%), the washing water was incorporated into the defluorinated phosphoric acid filtrate to obtain 4192 g of defluorinated dilute phosphoric acid;

[0053] C, get 3370 grams of defl...

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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 ammonium magnesium phosphate by using wet concentrated phosphoric acid residue, belonging to the technical field of chemical industry. Background technique [0002] In the production process of using the concentration method to produce ammonium phosphate, a considerable amount of concentrated phosphoric acid residue will be produced. The residue content of this phosphoric acid residue is relatively high, and the water-insoluble phosphorus is also very high. Therefore, most of the prior art can only use phosphoric acid. The use of residual acid to produce low-value conventional fertilizers such as heavy superphosphate, superphosphate-rich or agricultural grade ammonium nitrate in the market not only produces low economic value, b...

Claims

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Application Information

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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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