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A method for preparing high-quality multi-component water-soluble compound fertilizer using wet-process phosphoric acid

A wet-process phosphoric acid, water-soluble technology, applied in the field of phosphorus chemical industry, can solve the problems of high cost and reduce production cost, and achieve the effect of shortening the production process and low cost

Active Publication Date: 2017-07-11
中国-阿拉伯化肥有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to improve the existing production process of neutralization method in view of the problems existing in the existing water-soluble phosphorus and potassium compound fertilizer production technology, especially the high cost of using thermal phosphoric acid as a raw material, and propose a A method for producing multi-element phosphorus-potassium compound fertilizer from purified wet-process phosphoric acid as a raw material, so as to achieve the goal of being simple and easy in industry and greatly reducing production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Neutralization reaction

[0030] Take purified wet-process phosphoric acid (P 2 o 5 Content is 25% by weight), wherein, iron ion concentration is 1.06% by weight, aluminum ion concentration is 1.58% by weight, is sent to neutralization reactor preheating to 80 ℃, slowly adds 20% by weight of potassium hydroxide under continuous stirring solution;

[0031] (2) complexing agent addition

[0032] After reaching the end point of neutralization, add 2% EDTA·2Na of phosphoric acid to the reacted slurry, stir evenly, and continue to stir for 1 hour to obtain slurry;

[0033] (3) Preparation of multivariate water-soluble compound fertilizer

[0034] The multivariate water-soluble compound fertilizer product can be obtained by concentrating the slurry at 90°C and drying at 110°C. Among them, P 2 o 5 The content is 45.6% by weight, K 2 The O content was 34.8% by weight, the Fe content was 0.37% by weight, and the Mg content was 0.52% by weight.

Embodiment 2

[0036] (1) Neutralization reaction

[0037] Take purified wet-process phosphoric acid (P 2 o 5 content is 35%), wherein, iron ion concentration is 1.68% by weight, aluminum ion concentration is 1.50% by weight, is delivered to neutralization reactor preheating to 70 ℃, slowly adds 30% potassium carbonate solution under continuous stirring;

[0038] (2) Complexing agent and trace element addition

[0039] After the neutralization reaction finishes, add the sodium citrate of phosphoric acid consumption 1 weight % and the EDTA·2Na of 1 weight % in the slurry of reaction successively and stir, add the zinc sulfate of phosphoric acid consumption 0.5 weight %, the borax of 0.2 weight %, With reagents such as 0.1% by weight of ammonium molybdate, and continue to stir for 0.5 hours to obtain a slurry;

[0040] (3) Preparation of multivariate water-soluble compound fertilizer

[0041] The multivariate water-soluble compound fertilizer product can be obtained by concentrating the sl...

Embodiment 3

[0043] (1) Neutralization reaction

[0044] Take purified wet-process phosphoric acid (P 2 o 5 content is 45%), wherein, iron ion concentration is 2.01% by weight, aluminum ion concentration is 1.72% by weight, is delivered to neutralization reactor and is preheated to 90 ℃, slowly adds the potassium carbonate solution of 25% by weight under continuous stirring;

[0045] (2) Complexing agent and trace element addition

[0046] After the neutralization reaction, add 0.5% by weight of citric acid and 1.5% by weight of sodium citrate in the amount of phosphoric acid to the reacted slurry, stir evenly, add manganese sulfate in an amount of 0.1% by weight of phosphoric acid and 0.15% by weight of zinc sulfate and other reagents , and continue stirring for 0.5 hour to obtain a slurry;

[0047] (3) Preparation of multivariate water-soluble compound fertilizer

[0048] The multivariate water-soluble compound fertilizer product can be obtained by concentrating the slurry at 80°C an...

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Abstract

The invention relates to a method for preparing a high-quality multi-element water-soluble compound fertilizer by utilizing wet-process phosphoric acid. The method comprises the following steps: (1) preheating the purified wet-process phosphoric acid to the temperature of 60-100 DEG C in a reaction container, slowly adding 20-30 weight percent of potassium hydroxide or potassium carbonate solution while continuously stirring, and stopping adding the potassium hydroxide or potassium carbonate solution when the pH value is 4-5; (2) adding a complexing agent, uniformly stirring, adding trace element additives according to the formula requirements of the water-soluble fertilizer, continuously stirring for 0.5-1.5 hours, thereby obtaining slurry; and (3) concentrating the slurry in which the complexing agent and trace element additives are added at the temperature of 80-100 DEG C, drying at the temperature of 100-120 DEG C for 2-10 hours, thereby obtaining the multi-element water-soluble compound fertilizer. According to the method disclosed by the invention, the process route is simple, and the produced product can meet the requirements of crops on multiple large, medium and trace elements and is a water-soluble compound fertilizer with comprehensive nutrition.

Description

technical field [0001] The invention relates to the field of phosphorus chemical industry, in particular to a method for preparing high-quality multivariate water-soluble compound fertilizer by using wet-process phosphoric acid. Background technique [0002] Water-soluble fertilizer is a multi-component compound fertilizer that can be completely dissolved in water. It can be quickly dissolved in water and is more easily absorbed by crops. Moreover, its absorption and utilization rate is relatively high, which is more in line with the concept of environmental protection and has more development potential. A new generation of fertilizers. [0003] Potassium dihydrogen phosphate is a high concentration of phosphorus and potassium compound fertilizer, nutrient H 2 PO 4 - and K + It can be completely absorbed by crops, and has high nutritional content (P, K active components > 90%), which is unmatched by other fertilizers. Therefore, it is often regarded as one of the key...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C05G1/00
CPCC05B11/10C05C3/00C05D9/00C05D9/02
Inventor 李媛王家盛王金铭郑秀兴韩树民
Owner 中国-阿拉伯化肥有限公司
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