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Method for recycling fluorine in neutralized slurry of industrial monoammonium phosphate

A technology of industrial monoammonium phosphate and a recovery method, which is applied in the field of fluorine recovery in industrial monoammonium phosphate neutralization slurry, can solve the problem that the industrial monoammonium phosphate neutralized slurry cannot be completely consumed, restricts industrial monoammonium phosphate production, industrial The problems such as parking of the monoammonium phosphate plant have achieved the effects of low processing cost, improved quality and convenient operation

Active Publication Date: 2018-03-23
HUBEI XIANGYUN GROUP CHEM
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, there is an increasing demand for 58% and 60% fertilizer grade ammonium phosphate in the market. Adding too much slurry will cause the nutrients of fertilizer ammonium phosphate to fail to meet the standard, resulting in the inability of industrial monoammonium phosphate neutralization slurry to be completely consumed.
A large amount of unconsumable slag often causes the tank to be full, which leads to the shutdown of the industrial monoammonium phosphate plant, thereby restricting the production of industrial monoammonium phosphate. Therefore, it is urgent to develop a new comprehensive utilization technology for neutralizing slag

Method used

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  • Method for recycling fluorine in neutralized slurry of industrial monoammonium phosphate
  • Method for recycling fluorine in neutralized slurry of industrial monoammonium phosphate

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Experimental program
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Effect test

Embodiment 1

[0031] The solid content of the neutralized slurry is controlled at about 40%, and 98% concentrated sulfuric acid is added to the slurry according to 80% of the solid phase mass of the slurry, and the reaction is stirred at 90°C for 1 h. Filter to obtain acid hydrolysis filtrate, P in this acid hydrolysis filtrate 2 o 5 The content of phosphorus and fluorine is about 15%, the content of fluorine is about 2.2%, and the acid hydrolysis rate of phosphorus and fluorine are both above 99%.

Embodiment 2

[0033] The acid hydrolysis filtrate separated and obtained in Example 1 is cooled, crystallized, and filtered at a temperature of 5°C-10°C to obtain the acid hydrolysis filtrate for removing impurities. The main component of the separated crystals is ammonium magnesium sulfate hexahydrate. After analysis, the main content Above 99%.

Embodiment 3

[0035] Add the impurity-removing acid hydrolysis filtrate obtained in Example 2, according to the fluorine content in it, add anhydrous sodium sulfate solid in a molar ratio of 6:1 for reaction, the reaction temperature is 40°C, and the reaction time is 0.5h. After filtering and washing, fluosilicic acid is obtained. sodium. The filtered filtrate can be prepared into water-soluble fertilizer, and also used as raw material of binary fertilizer and ternary fertilizer. The purity of sodium fluorosilicate is 98.7%, and the yield of fluorine is 50%.

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Abstract

The invention relates to a method for recycling fluorine in neutralized slurry of industrial monoammonium phosphate. The method comprises the following steps: a, preparing the neutralized slurry and water into turbid liquid; b, slowly adding sulfuric acid in the turbid liquid and reacting, and then filtering to obtain acid-hydrolyzed filtrate; c, cooling, crystalizing and filtering the acid-hydrolyzed filtrate to obtain impurity-removed acid-hydrolyzed filtrate; and d, adding anhydrous sodium sulfate solid in the impurity-removed acid-hydrolyzed filtrate, reacting and filtering, and washing and drying filter cakes to obtain sodium fluosilicate products, wherein the filtrate is used for production of complex fertilizers. The method is simple to operate and low in treatment cost; and a way for comprehensive utilization of the neutralized slurry is provided for industrial monoammonium phosphate production enterprises.

Description

technical field [0001] The invention relates to the field of chemical production, in particular to a method for recovering fluorine in industrial monoammonium phosphate neutralization slurry. Background technique [0002] Industrial monoammonium phosphate neutralization slurry comes from the filter cake produced in the process of neutralization and filtration in the process of wet-process phosphoric acid production of industrial monoammonium phosphate. The filter cake is mixed with water to form a slurry, hereinafter referred to as neutralization slurry. For industrial monoammonium phosphate production enterprises, the amount of neutralized slurry is large, and 2.5-3 tons of slurry is produced for every ton of industrial monoammonium phosphate produced. The composition of the neutralized slurry is relatively complex, mainly including NH 4 h 2 PO 4 , (NH 4 ) 2 HPO 4 , MgHPO 4 , FeMg(NH 4 ) 2 (HPO 4 ) 2 ·F 3 , AlMg(NH 4 ) 2 (HPO 4 ) 2 ·F 3 Equal double salt...

Claims

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Application Information

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IPC IPC(8): C01B33/10C01F5/40
CPCC01B33/103C01F5/40C01P2006/80
Inventor 居丽何俊孔小雁梁蕾余莹黄忠丁一刚
Owner HUBEI XIANGYUN GROUP CHEM
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