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Method for preparing high-quality slow release compound fertilizer from wet-process phosphoric acid

A technology of slow-release compound fertilizer and wet-process phosphoric acid, which is applied in ammonium orthophosphate fertilizer, alkaline orthophosphate fertilizer, phosphate fertilizer, etc., can solve the problem of high cost of coating adjuvant, high production cost of slow-release fertilizer, and utilization of by-products. Low efficiency and other problems, to achieve the effects of enriching the reproduction of soil microorganisms, mild fertilizer efficiency, and high production efficiency

Inactive Publication Date: 2018-11-16
GUIYANG KAILIN FERTILIZER CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Most of the industrial by-products of wet-process phosphoric acid contain a certain proportion of phosphorus, and a small amount of them are directly applied to the soil as fertilizer in the industry, which has a certain fertilizer effect, but the utilization efficiency of these by-products is very low in this treatment method
Some people have also studied the use of individual types of by-products as slow-release fertilizer coating materials for the production of slow-release fertilizers. Hao Shixiong et al. used fertilizer grade calcium hydrogen phosphate as the coating material and polyvinyl alcohol as a coating auxiliary agent to develop a A slow-release compound fertilizer (document: "The development and release characteristics of calcium hydrogen phosphate coated urea", Hao Shixiong, Journal of Plant Nutrition and Fertilizer, 2006, 12 (3): 426-430), this document discloses fertilizer grade A new method for the utilization of calcium hydrogen phosphate, but the coating auxiliary agent used in this method is expensive, the production process is complicated, and the resulting slow-release fertilizer has a higher production cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A kind of method utilizing wet-process phosphoric acid to prepare high-quality slow-release compound fertilizer, comprises the steps:

[0025] (1) Neutralization reaction

[0026] Mix the purified wet-process phosphoric acid with sulfur powder, heat it to 50°C in a reaction tank, and slowly add alkali under constant stirring until the pH reaches 4; wherein, the P of the purified wet-process phosphoric acid 2 o 5 The content of the phosphoric acid is 20%; the mass ratio of the phosphoric acid and sulfur powder is 6:1, and the particle size of the sulfur powder is less than or equal to 100um; the alkali is mixed with calcium hydroxide and ammonium phosphate with a mass ratio of 3:1;

[0027] (2) Adsorption

[0028] When the temperature of the solution in the previous step drops to 40°C, add an adsorbent with 3% of the mass of the solution and stir for 0.5 hours to obtain a slurry; wherein, the adsorbent is prepared by mixing bentonite powder and vermiculite powder with ...

Embodiment 2

[0032] A kind of method utilizing wet-process phosphoric acid to prepare high-quality slow-release compound fertilizer, comprises the steps:

[0033] (1) Neutralization reaction

[0034] Mix the purified wet-process phosphoric acid with sulfur powder, heat it to 80°C in a reaction tank, and slowly add alkali under continuous stirring until the pH reaches 5; wherein, the P of the purified wet-process phosphoric acid 2 o 5 The content of the phosphoric acid is 45%; the mass ratio of the phosphoric acid and sulfur powder is 6:1, and the particle size of the sulfur powder is less than or equal to 100um; the alkali is mixed with calcium hydroxide and ammonium phosphate with a mass ratio of 3:1;

[0035] (2) Adsorption

[0036] When the temperature of the solution in the previous step drops to 45°C, add an adsorbent with 5% of the mass of the solution and stir for 1.5 hours to obtain a slurry; wherein, the adsorbent is prepared by mixing bentonite powder and vermiculite powder wit...

Embodiment 3

[0040] A kind of method utilizing wet-process phosphoric acid to prepare high-quality slow-release compound fertilizer, comprises the steps:

[0041] (1) Neutralization reaction

[0042] Mix the purified wet-process phosphoric acid with sulfur powder, heat it to 60°C in a reaction tank, and slowly add alkali under constant stirring until the pH reaches 6; wherein, the P of the purified wet-process phosphoric acid 2 o 5 The content of the phosphoric acid is 20%; the mass ratio of the phosphoric acid and sulfur powder is 6:1, and the particle size of the sulfur powder is less than or equal to 100um; the alkali is mixed with calcium hydroxide and ammonium phosphate with a mass ratio of 3:1;

[0043] (2) Adsorption

[0044] When the temperature of the solution in the previous step drops to 40°C, add an adsorbent with 5% of the mass of the solution and stir for 1.5 hours to obtain a slurry; wherein, the adsorbent is prepared by mixing bentonite powder and vermiculite powder with ...

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PUM

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Abstract

The invention relates to the technical field of fertilizer, in particular to a method for preparing high-quality slow release compound fertilizer from wet-process phosphoric acid. The method comprisessteps as follows: (1) a neutralization reaction, (2) adsorption and (3) preparation of the slow release compound fertilizer. According to the method, the utilization rate of raw materials is high, the reaction is rapid, the production efficiency is high, large-scale production is facilitated, and the prepared compound fertilizer has small irritation to crops, mild fertilizer efficiency and remarkable effects on enrichment of soil mineral elements and breeding of soil microorganisms.

Description

technical field [0001] The invention relates to the technical field of fertilizers, in particular to a method for preparing high-quality slow-release compound fertilizers using wet-process phosphoric acid. Background technique [0002] Phosphorus chemical industry is an industry that obtains various phosphorus-containing products through physical and chemical processing of phosphate rock as raw material. As an intermediate product of the industry, phosphoric acid is mainly produced by wet-process phosphoric acid and thermal process phosphoric acid. In recent years, with the changes in market demand and the constraints of resources, environment, energy and other factors, phosphoric acid and inorganic phosphate production technology based on wet-process phosphoric acid technology has gradually replaced traditional thermal phosphoric acid and phosphate production technology. However, in the process of industrial production of wet-process phosphoric acid, various phosphorus-con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G3/00C05G3/08C05G3/90
CPCC05B7/00C05G3/00C05G3/90C05B17/00C05D3/02C05D9/00C05D9/02C05F11/00C05F11/08
Inventor 吴有丽项双龙罗焕虎廖吉星何润林罗付浪徐立钦何花王采艳唐丽君韩朝应
Owner GUIYANG KAILIN FERTILIZER CO LTD
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