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Ardealite innocent treatment method

A harmless treatment, phosphogypsum technology, applied in the direction of protective devices against harmful chemicals, etc., to meet environmental protection requirements, create social benefits, and reduce treatment costs

Active Publication Date: 2006-12-13
SHANGHAI NANHUA WATER TREATMENT TECH ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current wet-process phosphoric acid production plants do not carry out special treatment for the by-product phosphogypsum, and the discharged phosphogypsum belongs to the list of hazardous wastes, which must be treated innocuously and can only be discharged after reaching the standard

Method used

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  • Ardealite innocent treatment method

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Experimental program
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Effect test

Embodiment

[0029] Two sets of phosphoric acid plants in a phosphate fertilizer plant, with a total production capacity of 800,000 tons / yearP 2 o 5 , the by-product phosphogypsum is 575 tons / hour (or 4.14 million tons / year), and the dry basis phosphogypsum contains water-soluble P 2 o 5 0.8-1.0% (weight), containing water-soluble F-0.35% (weight), pH≤2.0.

[0030] Set up phosphogypsum harmless treatment device according to the method of the present invention, contain following main equipment:

[0031] Ball mill1830×6120 1 set

[0032] Rotary filter, filter area 160m 2 2 units

[0033] 1 neutralization tank with a volume of 1152m 3 Multi-compartment reaction tank, with a size of 12000×12000×8000 (mm), contains 4 reaction compartments.

[0034] to combine figure 1 To illustrate the process of the present invention is as follows:

[0035] The raw material is phosphogypsum from phosphoric acid plant, 575 tons / hour, of which P 2 o 5 The content is 0.8% by weight, and the content...

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Abstract

The related innocent treatment method for ardealite as by-product in wet method comprises: adding water and repulping, alternative vacuum filtering and cleaning by water to remove the water-soluble P2O5 and F, returning the filtered liquid to recover the P2O5 and F; sending the cleaned gyps for building, or wet slagging off to send to neutralize with limestone till pH value>=4.5, clearing to obtain the sediment. With low cost, this invention reduces ardealite danger, and improves source utility.

Description

technical field [0001] The invention relates to a harmless treatment method of phosphogypsum, a by-product in the production process of wet-process phosphoric acid. Background technique [0002] Wet-process phosphoric acid is the basic intermediate product for the production of compound phosphate fertilizer or phosphate. It has a large demand and plays a very important role in the chemical industry. [0003] Wet-process phosphoric acid uses phosphate rock and concentrated sulfuric acid as raw materials, and the two react to form phosphoric acid (H 3 PO 4 ), and a large amount of gypsum (CaSO 4 2H 2 O), commonly known as phosphogypsum. At present, my country has formed about 5 million tons / year P 2 o 5 phosphoric acid production capacity, and the by-product phosphogypsum is about 25 million tons per year. Currently, due to the limited demand for gypsum, only a small part of it is used to produce sulfuric acid, cement, cement retarder, building gypsum products and other ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A62D3/00
Inventor 张国兴陈玉如
Owner SHANGHAI NANHUA WATER TREATMENT TECH ENG
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