Modified phosphogypsum and its preparation

A phosphogypsum, modification technology, applied in the field of modified phosphogypsum and its preparation, can solve the problems of waste phosphogypsum pollution, etc., and achieve the effects of increasing solubility, strong activation and high strength

Inactive Publication Date: 2003-02-05
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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Comparison scheme
Effect test

Embodiment Construction

[0020] A modified phosphogypsum of the present invention, its main weight is composed of: additives (aluminum sulfate slag, alunite, plant ash, bentonite, slag, dickite, paper mill and alkali plant waste liquid waste residue, white mud and sepiolite 1, 2 or 3 of them) 10-30%, phosphogypsum 70-90%.

[0021] The preparation of modified phosphogypsum used as cement retarder is:

[0022] The weight ratio of phosphogypsum is 90%, the waste liquid and waste residue of paper mills and alkali plants are 10% (or phosphogypsum is 93%, bentonite is 2%, alkali slag is 5%, or phosphogypsum is 85%, white mud Or 5% of sepiolite and 10% of plant ash) are mixed, then piled up, using solar energy as the energy source to swelter at 30-100°C for 8-48 hours, then molded and dried to obtain the finished product.

[0023] 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 sett...

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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 capable of using waste phosphogypsum from a phosphate fertilizer plant and using other waste residues and waste liquids as additives to produce cement retarders and cement reinforcing agents and its preparation. 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 of the modified phosphogypsum of the present invention consists of: additives (aluminum sulfate slag, alunite, plant ash, bentonite, slag, dickite, paper mills and alkali plant waste liquid waste, white mud and sepiolite 1 ...

Claims

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Application Information

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