Recycling method of high concentration phosphate and compound fertilizer residues

A high-concentration, waste-slag technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problem of not being well used, and achieve the effect of high recovery rate

Inactive Publication Date: 2017-05-31
毛竹青
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It has not been well used for a long time, the current comprehensive utilization rate is only about 10%, and the annual utilization is 4-5 million tons

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0006] raw material. Take high-concentration phosphorus compound fertilizer slag wet powder with 10-30% attached water into the reactor, add water to dilute.

[0007] Acid hydrolysis. Slowly inject dilute nitric acid, stirring constantly, until no bubbles come out.

[0008] Press filter. The mixture is injected into a filter press for pressure filtration, and the filtrate is retained.

[0009] Clean up. Inject ammonia water into the filtrate, stir constantly, until the pH value of the filtrate is 8.5, let stand for 30 minutes, filter, remove the filter residue, and keep the filtrate.

[0010] carbonization. Inject carbon dioxide gas into the filtrate, stir constantly, and filter.

[0011] dry. Dry the filter residue with a dryer, the drying temperature is 120, and the drying time is 2 hours, which is the finished light calcium carbonate.

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Abstract

The invention relates to a recycling method of a high concentration phosphate and compound fertilizer residue. The method comprises the following steps: by taking a high concentration phosphate and compound fertilizer waste residue as a raw material, putting the waste residue wet powder in a reactor; adding water to dilute; slowly injecting dilute nitric acid; continuously stirring the mixture till no air bubbles emit; performing press filtering; injecting ammonia water into the filtrate; continuously stirring the mixture; filtering; injecting carbon dioxide gas into the filtrate; continuously stirring the mixture; filtering the same; and drying the filter residue with a drier to obtain a finished product light calcium carbonate.

Description

technical field [0001] The invention relates to the technical field of comprehensive utilization of industrial waste, in particular to a method for recycling high-concentration phosphorus compound fertilizer slag. Background technique [0002] An industrial by-product of gypsum produced during the production of high-concentration phosphorus compound fertilizers, the main component is calcium sulfate dihydrate, and the production volume is increasing rapidly. Yunnan, Hubei, Guizhou, Shandong, Anhui, Chongqing, Jiangsu, Sichuan, Guangdong, and Shaanxi have The production of phosphogypsum in ten provinces and cities accounts for 91.5% of the total production of phosphogypsum in the country. Since 2010, the production volume has reached 40-70 million tons per year, and the accumulated stockpiles have exceeded 100 million tons. It has not been well used for a long time, and the current comprehensive utilization rate is only about 10%, and the annual utilization is 4 to 5 million...

Claims

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Application Information

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IPC IPC(8): C01F11/18
CPCC01F11/18
Inventor 毛竹青
Owner 毛竹青
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