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Method for preparing calcined phosphogypsum from industrial waste phosphogypsum

A phosphogypsum, industrial technology, applied in the field of treatment of industrial waste phosphogypsum, can solve the problems of affecting the performance of gypsum products, restricting the full utilization of phosphogypsum and the like

Inactive Publication Date: 2012-01-18
WEIFANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Someone once proposed to use lime to neutralize the acid in phosphogypsum, but this method also produces new impurities such as calcium fluoride and calcium phosphate that are not easy to remove. These impurities will affect the performance of gypsum products, thus limiting the full use of phosphogypsum. use

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  • Method for preparing calcined phosphogypsum from industrial waste phosphogypsum

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Experimental program
Comparison scheme
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Embodiment 1

[0015] Embodiment 1, prepare paris phosphogypsum according to the following steps:

[0016] a. Remove black impurities: put 2 tons of industrial waste phosphogypsum in a volume of 3m 3 Add water to the washing neutralization pool until the liquid level exceeds the surface of phosphogypsum by 50-60cm, stir at a speed of 100r / min, and slowly add 3kg of suspending agent after 5 minutes. The ratio is mixed; after fully stirring for 2 hours, the material will form a uniform turbid viscous slurry, and let it stand for 2 hours. The gray emulsion is discharged into the neutralization flocculation tank, and the material in the lower layer is left in the original tank;

[0017] Add water to the original tank again until the liquid level exceeds the surface of the material by 40-50cm, and stir at a speed of 100r / min. After 5 minutes, slowly add 1 kg of the above-mentioned suspending agent, and stir thoroughly for 2 hours to make the material form a uniform turbid viscous slurry. , stan...

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Abstract

The invention relates to a method for preparing calcined phosphogypsum by industrial waste phosphogypsum, which comprises the following steps: firstly removing black impurities in a raw material by a special suspending agent under the conditions of adding water and stirring, secondly removing acid in the raw material by a neutralizing agent, thirdly removing hard particles in the raw material through filtering, and finally obtaining a finished product through settling and drying. The method has simple technology, and the prepared calcined phosphogypsum has good performance and wide application. The prepared calcined phosphogypsum can be used solely, can be doped in common high-strength gypsum for use, is comparable to the common high-strength gypsum in performance, and can be widely applied to industrial production.

Description

technical field [0001] The invention belongs to the technical field of industrial waste phosphogypsum treatment, in particular, it relates to a method for preparing paris phosphogypsum from industrial waste phosphogypsum. Background technique [0002] Phosphogypsum is the waste slag produced when phosphoric acid and ammonium phosphate fertilizers are produced by wet method of phosphate rock powder in industry. This kind of waste residue is acidic and seriously pollutes the environment, and is regarded as the first chemical waste residue by countries all over the world. How to deal with this waste residue has become a problem of increasing concern. [0003] Because phosphogypsum contains free carbon, hydrochloric acid, sulfuric acid and other impurities, it is difficult to make full use of it. At present, only a small part is used as cement retarder and acid co-production cement, while most of phosphogypsum is idle and wasteful, which not only requires land storage, but als...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/26
CPCC04B11/26
Inventor 王宏曹玉宝
Owner WEIFANG UNIVERSITY