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Modified phosphogypsum as well as preparation method and use of modified phosphogypsum

A phosphogypsum and modification technology, which is applied in the field of modified phosphogypsum and its preparation, can solve the problems of high heat consumption, difficult temperature control, long processing time, etc., and achieve the improvement of later strength, stable and reliable quality, and thorough modification Effect

Inactive Publication Date: 2015-01-28
鑫统领建材集团有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] The above patents have the disadvantages of difficult temperature control, high heat consumption and long processing time.

Method used

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  • Modified phosphogypsum as well as preparation method and use of modified phosphogypsum
  • Modified phosphogypsum as well as preparation method and use of modified phosphogypsum

Examples

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Embodiment 1

[0054] 1) Mix phosphogypsum and papermaking white mud, stir for 30 minutes, then add kiln dust, and continue to stir vigorously for 1 hour until the suspension becomes dark yellow;

[0055] 2) Check the pH value at room temperature, adjust the pH value with sodium hydroxide to 7-10, and then age for 12 hours, during which time it is slightly stirred every 3 hours;

[0056] 3) Filter with a medium-speed filter with a mesh size less than 45 μm until no obvious water drops fall;

[0057] 4) Put the filter residue into a vacuum extruder, and dehydrate the filter residue until the moisture is less than 10% under a pressure of 0.5 MPa to obtain modified phosphogypsum;

[0058] 5) The modified phosphogypsum is dried at a temperature of 100-105°C, and then made into a 30mm-50mm ball.

[0059] Prepare modified phosphogypsum samples F1-F9 of the present invention as described above, wherein:

[0060] F1-F3: 10% water content of phosphogypsum: 100g, 20% water content of papermaking lim...

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Abstract

The invention belongs to the field of waste residue utilization and specifically relates to a modified phosphogypsum as well as a preparation method and a use of the modified phosphogypsum, solving the technical problem that a novel modified phosphogypsum is provided, which is prepared by taking phosphogypsum, papermaking white clay and kiln dust as raw materials so that industrial waste residues are utilized thoroughly to overcome the defect that the previous modifiers need other natural minerals and chemical raw materials to further achieve the purpose that wastes are treated by using wastes. The modified phosphogypsum is prepared from the following raw materials in parts by weight based on dry matters: 0.2-0.9 part of phosphogypsum, 0.9-8.1 parts of papermaking white clay, and kiln dust accounting for 0.5%-3% of the total weight of the modified phosphogypsum. The preparation method of the modified phosphogypsum comprises the treatment steps of washing, flotation, alkaline neutralization modification and the like; meanwhile, the modification process is basically performed in slurry, and therefore, the phosphogypsum is modified thoroughly, and stable and reliable in quality. The obtained modified phosphogypsum can be used as a cement retarder.

Description

technical field [0001] The invention belongs to the field of waste residue utilization, and in particular relates to a modified phosphogypsum and its preparation method and application. Background technique [0002] Phosphogypsum refers to the solid waste generated when sulfuric acid is used to treat phosphate rock in the production of phosphoric acid, and its main component is calcium sulfate, namely CaSO 4 2H 2 O, in addition, it also contains undecomposed phosphate rock, unwashed phosphoric acid, calcium fluoride, iron, aluminum compounds, acid insoluble matter, organic matter and other impurities, which affect the utilization of phosphogypsum. [0003] Currently, the vast majority of phosphogypsum is discarded as waste. The discharged phosphogypsum waste slag occupies a large amount of land, secondly, the investment in the storage yard is large and the operation cost is high, thirdly, the precious sulfur resources are wasted, and fourthly, the environment is polluted. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B22/08B09B3/00
Inventor 封培然
Owner 鑫统领建材集团有限公司
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