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Method for preparing reinforced gypsum powder, reinforced gypsum powder and plastering gypsum

A technology of gypsum powder and phosphogypsum, applied in the field of reinforced gypsum powder and plastering gypsum, and preparation of reinforced gypsum powder, which can solve the problems of easy damage, restrictions on the application of phosphogypsum-made building gypsum powder, and uneven product performance.

Pending Publication Date: 2018-11-06
CHONGQING BOSHUANG BUILDING MATERIAL
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the building gypsum powder prepared by conventional methods has low flexural strength, and its products such as gypsum wallboards and gypsum blocks have low flexural strength and are easy to break
Moreover, the performance of the product is not uniform, and the water-cement ratio is not stable during molding
These factors greatly limit the application of building gypsum powder made of phosphogypsum

Method used

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  • Method for preparing reinforced gypsum powder, reinforced gypsum powder and plastering gypsum
  • Method for preparing reinforced gypsum powder, reinforced gypsum powder and plastering gypsum
  • Method for preparing reinforced gypsum powder, reinforced gypsum powder and plastering gypsum

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A method for preparing reinforced gypsum powder, prepared according to the following steps:

[0023] Step 1, modification: crushing and modifying calcined gypsum to obtain modified gypsum powder;

[0024] Step 2. Purification: removing impurities without gelling properties in the modified gypsum powder to obtain reinforced gypsum powder.

[0025] Wherein, the phosphogypsum is firstly heated and dried to reduce the water content to 8-10%, and then calcined at 130-150° C. for 10-60 minutes to obtain calcined gypsum, and then the modification treatment in the first step is carried out. The calcination is carried out in a FC compartment calciner, which is an existing equipment (CN203878066U). A large amount of external water and internal water and the most harmful components in phosphogypsum are mainly residual organic phosphorus, inorganic phosphorus and ammonium phosphate. If they are removed or turned into harmless components, then phosphogypsum is very easy to use. "F...

Embodiment 2

[0030] A kind of reinforced gypsum powder, prepared by the method of embodiment 1. The properties of the enhanced gypsum powder and common building gypsum powder are compared in Table 1. The strength test is to stir the gypsum powder with water, condense it into a standard test block of 40mm×40mm×100mm, and measure it on a mechanical testing machine. It can be seen that the performance of reinforced gypsum powder is different from that of ordinary building gypsum powder after crushing, modification and purification. Compared with traditional gypsum, the strength of reinforced gypsum is significantly improved, the particle size is reduced and uniformly distributed, the standard consistency is stable, and the hydration paste has good flexibility.

[0031] After testing, the setting time of the standard consistency of the reinforced gypsum powder is: initial setting time 6 minutes, final setting time 11 minutes; after watering and setting, the strength of 2 hours is: flexural st...

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Abstract

The invention discloses a method for preparing reinforced gypsum powder. The method comprises the following steps: step 1, modification: crushing and modifying calcined gypsum to obtain modified gypsum; and step 2, purification: removing large-particle impurities in the modified gypsum powder to obtain reinforced gypsum powder. The invention further discloses plastering gypsum which comprises thereinforced gypsum powder and a composite additive. The method, the reinforced gypsum powder and the plastering gypsum have the beneficial effects that a technique for producing high-performance gypsumpowder from phosphogypsum as a raw material is opened up, and effective resource utilization of phosphogypsum is facilitated; and a novel reinforced gypsum product prepared through modifying reinforcement is high in breaking strength, stable in setting time and cement normal consistency, is higher than common building gypsum in overall performance, is larger than building gypsum in application range, and breaks through the limitation that common building gypsum cannot be applied to indoor plastering. The plastering area of the unit weight of dry powder of the prepared plastering gypsum is larger than that of the same weight of building gypsum and cement mortar, the material cost is relatively low, and the prepared plastering gypsum is suitable for indoor plastering.

Description

technical field [0001] The invention relates to the field of gypsum building materials, in particular to a method for preparing reinforced gypsum powder, and the reinforced gypsum powder and stucco gypsum prepared by the method. Background technique [0002] At present, my country's industrial waste phosphogypsum and flue gas desulfurization gypsum stocks have reached more than 800 million tons, and phosphogypsum and desulfurization gypsum are still being produced continuously, causing resource and environmental pressure. In the prior art, building gypsum powder is prepared from phosphogypsum and desulfurized gypsum through calcination technology, which is a resource utilization method. However, the building gypsum powder prepared by conventional methods has low flexural strength, and its products such as gypsum wallboards and gypsum blocks have low flexural strength and are easily damaged. Moreover, the performance of the product is not uniform, and the water-cement ratio ...

Claims

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Application Information

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IPC IPC(8): C04B28/14C04B11/26C04B11/036
CPCC04B11/036C04B11/26C04B28/143C04B24/06C04B22/16C04B2103/0057C04B14/26C04B24/38
Inventor 黄开仕黄蕾露刘远友黄小兵黄晶晶滕令杨代兴
Owner CHONGQING BOSHUANG BUILDING MATERIAL
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