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Extrusion production method of stony phosphogypsum product

A production method and technology of phosphogypsum, which is applied in the field of solid waste resource utilization and prefabricated building materials, can solve the problems of low strength, poor water resistance, and low proportion of gypsum, and achieve low preparation cost, easy preparation, and flexible production Effect

Active Publication Date: 2021-01-29
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to its poor water resistance, gypsum products cannot be used in the external walls of the construction field and in coastal areas and East China areas with high humidity. In order to solve the problem of water resistance, people usually add cement and active minerals to improve the softening of phosphogypsum products. coefficient, but there are still problems of low proportion of gypsum and low strength

Method used

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  • Extrusion production method of stony phosphogypsum product

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Based on the total batching mass of 500kg, the amount of gypsum accounts for 96% of the main material mass, and the total weight of β-hemihydrate gypsum and dihydrate gypsum is 480kg according to the mass ratio of 1:3, and 20 kg of ordinary Portland P.I42.5 cement accounts for Ratio of 4%, respectively sent to the activated stirring tank by screw conveyor, and at the same time, add seeds according to the following ingredients: the sum of the addition amount of α gypsum seeds and the seeds prepared by the consolidated body is 0.4% of the mass of the main material ‰, the mass ratio of the two is 1:1, and the mass proportion of the added α-gypsum seeds with a particle size of less than 38 μm is 95%, and the mass proportion of the seeds with a particle size of less than 38 μm in the consolidated body is 97%; The consolidated body is obtained by cementing with the label P.I42.5. Weigh 250kg of process water according to the water-cement ratio of 0.50, and weigh 0.1kg of sodiu...

Embodiment 2

[0038] Based on the total batching mass of 500kg, the amount of phosphogypsum accounts for 91% of the mass of the main material, and the total weight of β-hemihydrate gypsum and dihydrate gypsum is 455kg according to the mass ratio of 1:0.5, and 45kg of ordinary portland cement clinker accounts for 9 %, respectively sent to the activated stirring tank by the screw conveyor, and at the same time add the crystal seeds according to the following ingredients: the sum of the addition amount of the α gypsum crystal seeds and the seeds prepared by the consolidated body is 0.6‰ of the mass of the main material, The mass ratio of the two is 1:1, and the mass of the added α-gypsum seeds with a particle size of less than 38 μm accounts for 98%, and the mass of the seeds prepared by the consolidated body has a particle size of less than 38 μm accounts for 97%; The consolidated body is obtained by solidifying clinker slurry; weigh 200kg of process water according to the water-cement ratio o...

Embodiment 3

[0040] Based on the total batching mass of 500kg, the amount of gypsum accounts for 93% of the mass of the main material, weighing 465kg of hemihydrate gypsum and dihydrate gypsum according to the mass ratio of 1:1, and 35kg of ordinary portland cement clinker accounting for 7%, respectively Send it into the agitated tank that has been started by a screw conveyor, and add seeds according to the following ingredients at the same time: the sum of the addition amount of α-gypsum seeds and the seeds prepared by the consolidated body is 0.2‰ of the mass of the main material, and the mass of the two The ratio is 1:1, and the mass of the added α-gypsum seed crystals with a particle size less than 38 μm accounted for 98%, and the mass of the seed crystals prepared by the consolidated body accounted for 95%; the consolidated body Obtained from clinker net slurry consolidation; Weigh 225kg of process water according to the water-cement ratio of 0.45, weigh the main material 0.2‰ sodium l...

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Abstract

The invention discloses an extrusion production method of a stony phosphogypsum product, and relates to the field of industrial solid waste recycling and building material preparation. Beta-hemihydrate gypsum and dihydrate phosphogypsum are used as main raw materials, cement and cement clinker are used as cementing materials, and a synergist and a retarder are added. The method comprises the following steps of: adding an insoluble synergist into a main body material, carrying out dry mixing, spraying process water dissolved with an easily soluble additive, and producing a gypsum product by adopting an extrusion method to obtain the stony phosphogypsum product with the appearance similar to that of a natural stone structure. Through the method disclosed by the invention, the phosphogypsum pretreatment cost can be reduced, the material ratio can be adjusted according to different use requirements to produce various gypsum products, and a feasible technical scheme is provided for full recycling of phosphogypsum.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of solid waste and assembled building materials, and in particular relates to an extrusion production method of petrochemical phosphogypsum products. Background technique [0002] Phosphogypsum is a solid waste associated with the production of high-concentration phosphate fertilizers, usually based on the dihydrate process, and its main component is CaSO 4 2H 2 O, the mass content is usually more than 85%, similar to natural gypsum, but because it contains soluble phosphorus, eutectic phosphorus, organic matter and other impurities, it seriously affects the crystallization habit of dihydrate gypsum when the hemihydrate gypsum prepared from phosphogypsum is hydrated , is the main reason why phosphogypsum is difficult to be effectively used in the traditional construction field. Therefore, the resource utilization of phosphogypsum is still a worldwide problem, and it is also one of th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14
CPCC04B28/147C04B28/143C04B2201/50C04B2201/20C04B22/143C04B7/02C04B24/20C04B24/14C04B24/10C04B24/18C04B24/06C04B22/165Y02W30/91
Inventor 许世斌夏举佩
Owner KUNMING UNIV OF SCI & TECH
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