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Modified phosphogypsum and its preparation

A phosphogypsum modification technology, applied in the field of modified phosphogypsum, can solve the pollution of waste phosphogypsum and achieve the effect of increasing solubility

Inactive Publication Date: 2005-07-20
孙国庆 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to solve the pollution problem of waste slag and waste liquid such as waste phosphogypsum

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0012] A modified phosphogypsum of the present invention, its main weight is composed of: additives (plant ash, bentonite, slag, dickite, waste liquid and slag of paper mills and alkali plants, white mud and sepiolite 1, 2 or 3 species) 3-10%, phosphogypsum 90-97% (excluding 90%).

[0013] The preparation of modified phosphogypsum used as cement retarder is:

[0014] Mix 93% phosphogypsum, 2% bentonite, and 5% alkali slag by weight, then stack, use solar energy as energy, heat at 30-100°C for 8-48 hours, and then shape and dry to obtain the finished product.

[0015] Table 1 shows the test results of modified phosphogypsum as cement retarder. No. 1 is ordinary dihydrate gypsum, No. 2-5 is modified phosphogypsum, its setting time: initial setting 2-3 hours, final setting within 5 hours, fineness 6-8%, SO2 in cement 3 Between 2.2-2.7%, the stability is qualified.

[0016]

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Abstract

The present invention discloses a modified phosphogypsum and its preparation process. Its main weight composition is formed from 10-30% of additive (one, two or three kinds of aluminium sulfate slag, alum stone, plant ash, bentonite, slag, dickite, waste liquor and waste residue of paper mill and soda plant, white mud and sepiolite) and 70-90% of phosphogypsum. The phosphogypsum and additive are mixed together, and stacked at a certain temp. so as to obtain the modified phosphogypsum. If said modified phosphogypsum is closed-heated at 30-100 deg.C for 8-48 hr., and formed, dried and can be made into the cement retarded, and if the modified phosphogypsum closed-heated for 8-24 hr, is calcined at 600-900 deg.C, and can be made into cement reinforcing agent.

Description

Technical field [0001] The invention relates to a modified phosphogypsum that can use waste phosphogypsum from a phosphate fertilizer plant and use other waste residues and waste liquids as additives to produce cement retarders and cement enhancers. Background technique [0002] At present, when phosphate fertilizer plants produce phosphoric acid, 5 tons of waste phosphogypsum are produced for every ton of phosphoric acid produced. Since they have not been well utilized for a long time, they not only need a lot of storage space, but also pollute the environment. Contents of the invention [0003] In order to solve the pollution problem of waste slag and waste liquid such as waste phosphogypsum. [0004] The main weight composition of the modified phosphogypsum of the present invention is as follows: the additive is composed of 1, 2 or 3 of plant ash, bentonite, slag, dickite, waste liquid and slag from paper mills and alkali plants, white mud and sepiolite , the additive ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/024C04B11/26C04B22/14
CPCC04B2103/20C04B22/143C04B11/024C04B11/26
Inventor 凌一心孙国庆
Owner 孙国庆