Method for dynamically and continuously producing ultrahigh-strength gypsum

A high-strength gypsum and ultra-high-strength technology, applied in the field of high-quality utilization of industrial by-product gypsum, can solve the problems of discontinuous process, high cost, poor waterproof performance, etc., achieve comprehensive utilization of resources, reduce production costs, and reduce the amount of addition Effect

Active Publication Date: 2019-05-03
SOUTHWEAT UNIV OF SCI & TECH
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Problems solved by technology

[0008] At present, the process of preparing high-strength gypsum from industrial by-product gypsum is discontinuous, with low efficiency and high cost, which hinders the utilization of gypsum. In addition, the current high-strength gypsum is still low in strength and poor in waterproof performance, which also hinders its high-value application.

Method used

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  • Method for dynamically and continuously producing ultrahigh-strength gypsum
  • Method for dynamically and continuously producing ultrahigh-strength gypsum

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Embodiment Construction

[0032] The present invention will be described in further detail below in conjunction with specific examples.

[0033] (1) After adding water, water reducing agent and buffering agent to the gypsum and mixing them evenly, pump them into the autoclave to undergo a crystal transformation reaction to obtain high-strength gypsum. The formula of high-strength gypsum is shown in Table 1.

[0034] Table 1

[0035]

[0036] (2) After continuously injecting high-strength gypsum into the particle size control kettle, pump it into the stabilization kettle, add retarder, and stir evenly, then pump the high-strength gypsum into the liquid-solid separator for dehydration, and the dehydrated high-strength gypsum passes through the material sealing device Continuously enter the drying and disintegrating machine, and obtain high-strength gypsum dry powder through the dust collector, and add organic and inorganic reinforcing agents to the high-strength gypsum dry powder to obtain ultra-high-...

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Abstract

The invention discloses a method for dynamically and continuously producing ultrahigh-strength gypsum. The method comprises the steps: adding water, a water reducer and a buffering agent into gypsum,carrying out uniform mixing, then, injecting the mixture into an autoclave by using a pump, and carrying out a crystal transformation reaction to obtain high-strength gypsum; continuously injecting the high-strength gypsum into a particle size regulating kettle, then, pumping the high-strength gypsum into a stabilizing kettle, adding a set retarder, and carrying out uniform stirring; then, injecting the high-strength gypsum into a liquid-solid separator by using a pump to carry out dehydration, then, making the dehydrated high-strength gypsum continuously enter a drying and dispersing machineby a sealing device, and obtaining dry powder of the high-strength gypsum by a dust collector; and adding a reinforcing agent into the dry powder of the high-strength gypsum to obtain a finished product of the ultrahigh-strength gypsum. Compared with an existing technical scheme, the method has the characteristics such as low production cost, high production efficiency and good product quality.

Description

technical field [0001] The invention relates to the field of resource utilization of industrial waste residues, in particular to high-quality utilization of industrial by-product gypsum. Background technique [0002] Gypsum is a sulfate mineral with the chemical formula CaSO 4 ·xH 2 O. Gypsum is divided into natural gypsum and industrial by-product gypsum. At present, industrial by-product gypsum is mainly phosphogypsum, desulfurization gypsum and titanium gypsum. [0003] Phosphogypsum is the industrial waste discharged during the production process of wet-process phosphoric acid. Due to different production processes, it will contain dihydrate gypsum (CaSO4·2H2O) and hemihydrate gypsum (CaSO4·0.5H2O), with dihydrate gypsum as the main component. In addition, it also contains a small amount of impurities such as undecomposed phosphate rock powder, free phosphoric acid, iron phosphate, aluminum phosphate and fluorosilicate; the annual discharge of phosphogypsum in the wo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14
Inventor 马小玲谭宏斌董发勤
Owner SOUTHWEAT UNIV OF SCI & TECH
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