Unlock instant, AI-driven research and patent intelligence for your innovation.

A method for conditioning and tempering ammonium phosphate by using phosphoric acid production waste residue

A technology of waste residue and phosphoric acid, applied in the direction of phosphate, phosphorus oxyacid, etc., can solve the problems of unfavorable control of cost, environmental pollution, affecting the normal operation of production, etc., and achieves good popularization and application value, convenient use, and good equipment versatility. Effect

Active Publication Date: 2015-10-28
红河合众锌业有限公司
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Phosphogypsum is the solid waste generated in the production of wet-process phosphoric acid. It is often deposited at the bottom of the phosphoric acid storage tank. If it is not treated and utilized, it will not only affect the normal operation of the production, but is not conducive to cost control. It will also pollute the environment if it is directly discharged.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] A. Drying: The phosphoric acid produced by the wet method is separated from the liquid slag by the sedimentation method, and the separated waste residue is dried to a moisture content of 20%, which contains 85% of phosphogypsum;

[0025] B. Pulverization: Pulverize and sieve the dried waste residue with an airflow pulverizer to make the particle size 2~3mm;

[0026] C. Acid preparation: slowly add the screened waste residue to phosphoric acid with a solid content of 5% in an amount of 50kg / t, and stir evenly, adjust the solid content of the acid solution to 10%, and the concentration of phosphoric acid to 43.5%. Subsequent ammoniation reaction.

[0027] The tempering results show that the nutrient content of the produced monoammonium phosphate product is 58.5%, and the moisture content is 3%, which meets the requirements of the national standard.

Embodiment 2

[0029] A. Drying: The phosphoric acid produced by the wet method is separated from the liquid slag by the sedimentation method, and the separated waste residue is dried to a moisture content of 30%, which contains 78% of phosphogypsum;

[0030] B. Pulverization: pulverize and sieve the dried waste residue with a grinder to make the particle size 1~2mm;

[0031] C. Acid preparation: slowly add the screened waste residue to phosphoric acid with a solid content of 6% in an amount of 75kg / t, and stir evenly, adjust the solid content of the acid solution to 12%, and the concentration of phosphoric acid to 43%. Subsequent ammoniation reaction.

[0032] The tempering results show that the nutrient content of the produced monoammonium phosphate product is 58%, and the moisture content is 2%, which meets the requirements of the national standard.

Embodiment 3

[0034] A. Drying: The phosphoric acid produced by the wet method is separated from the liquid slag by the sedimentation method, and the separated waste residue is dried to a moisture content of 25%, which contains 70% of phosphogypsum;

[0035] B. Pulverization: pulverize and sieve the dried waste residue with a mechanical pulverizer to make the particle size 3~4mm;

[0036] C. Acid preparation: slowly add the sieved waste residue to phosphoric acid with a solid content of 8% in an amount of 100kg / t, and stir evenly, adjust the solid content of the acid solution to 14%, and the phosphoric acid concentration to 44.5%. Subsequent ammoniation reaction.

[0037] The tempering results show that the nutrient content of the produced monoammonium phosphate product is 58.5%, and the moisture content is 4%, which meets the requirements of the national standard.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses a method for conditioning and tempering ammonium phosphate by using phosphoric acid production waste residue, and belongs to the technical field of phosphate fertilizer production. The method of the present invention includes the steps of drying, crushing and acid preparation: firstly, the liquid slag is separated from the phosphoric acid produced by the wet method, and the separated waste slag is dried until the moisture content is ≤ 30%; Diameter ≤ 5mm; then add the waste residue to phosphoric acid, adjust the solid content of the acid solution to 10~14%, and the concentration of phosphoric acid to 43~44.5%, which can be used for the subsequent ammoniation reaction. The method of the invention makes full use of the rich agricultural nutritional value of phosphogypsum, reduces environmental pollution while saving resources, and is simple to operate, easy to use, strong in process interchangeability, and good in equipment versatility. On the basis of qualified rate, it effectively reduces the total nutrition of the product, improves the quality stability of the product at the same time, saves the production cost, and has good promotion and application value.

Description

technical field [0001] The invention belongs to the technical field of phosphate fertilizer production, and in particular relates to a method for conditioning and tempering ammonium phosphate with waste from wet-process phosphoric acid production, effectively reducing the total nutrient of the product and saving production costs on the basis of ensuring that the moisture content of the product is qualified. Background technique [0002] The main raw materials for the production of monoammonium phosphate are phosphate rock, sulfuric acid and ammonia. Among them, the slurry method uses dilute phosphoric acid and ammonia to react to produce monoammonium phosphate. Among these factors, dilute phosphoric acid has the greatest impact on the total nutrients of monoammonium phosphate. solid content. Solid content is an important index to measure the quality of dilute phosphoric acid. In the subsequent ammonification reaction, all solids in dilute phosphoric acid will enter into mono...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/28
Inventor 张勇潘云辉
Owner 红河合众锌业有限公司