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Method of comprehensive utilization of phophogypsum

A technology of phosphogypsum and a new method is applied in the field of comprehensive utilization of phosphogypsum, which can solve the problems of porosity, limited specific surface area, enlargement, etc., and achieve the effect of remarkable economic and social benefits, excellent performance, and improvement of soil structure.

Inactive Publication Date: 2006-01-25
成都正光生态工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this pillared phyllosilicate (pillared montmorillonite) is still a 2:1 layered structure, the introduction of pillared ions only expands the interlayer distance, and the increase in porosity and specific surface area is limited.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] Make phosphogypsum (80 mesh) into a slurry with a solid-to-liquid ratio of 1:2, add sulfuric acid, control the pH of the solution to about 1.5, stir and mix at 90-95°C for 1 hour and 20 minutes for pretreatment; After the temperature of the phosphogypsum slurry drops below 80°C, add sodium-based montmorillonite (80 mesh) slurry with a solid-to-liquid ratio of 1:2, and the dry weight of the sodium-based montmorillonite is 4 times the dry weight of the phosphogypsum. PH is about 1.5, stir and react for 20 minutes, then add straw powder (20 mesh) which is equivalent to 50% of the dry weight of Na-based montmorillonite, control pH<3, temperature 60-70°C, stir and react for 25 minutes , add ammonium carbonate, adjust the pH to 5-6, continue to stir and react for 20 minutes, add straw powder (20 mesh) equivalent to 20% of the dry weight of layered silicate again, and keep the temperature at 60-70 ° C. Continue to stir and react for 10 minutes to discharge the material, and fi...

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PUM

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Abstract

By utilizing the 'crystal' nucleon action of the industrial residue phosphogypsum crystal grain and at the presence of auxiliary actions of the organic acids (such as humic acid transformed from crop stalks through fast decomposition action), the 2:1 type sheet silicate structure (montmorillonite) is transformed into 1:1 type porous sheet silicate of porcelain clay structure, rigid column support is formed between the layers, the porous structure can substantially increase specific surface area, more moisture and nutrient medium can be embedded, thus all-natural ecological desert-treatment material can be prepared for combining the functions of water retention, fertilizer accumulation, slow release and improving soil structure.

Description

technical field [0001] The invention relates to comprehensive utilization of waste, in particular to a comprehensive utilization method of phosphogypsum. Background technique [0002] Phosphogypsum is industrial waste from phosphoric acid plants, phosphate fertilizer plants and some synthetic detergent plants. The amount of discharge is huge (for example, a phosphoric acid plant will discharge 4.5 tons of phosphogypsum for every ton of phosphoric acid produced), and it is often piled up like a mountain, causing serious pollution to the ecological environment. In order to save resources and improve the ecological environment, countries have carried out unremitting research on the resource utilization of phosphogypsum waste. Its utilization mainly focuses on cement building materials, and is also used to produce ammonium sulfate and improve saline-alkali soil. Recently, there is also a patent report on using phosphogypsum as fertilizer (application number: 88107910.3, 0113952...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05B17/00C05F17/00C05G3/04C05G3/80
CPCY02W30/40
Inventor 梁玉祥薛合伦赖中元石常青
Owner 成都正光生态工程有限公司