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Denatured ardealite brick and its application as cement retardant

A technology for gypsum bricks and phosphogypsum is applied in the field of utilization of phosphogypsum, a by-product of phosphorus chemical industry, and can solve the problems of limited mixing amount, low early strength of admixtures, and high cement production cost.

Inactive Publication Date: 2003-01-08
WUHAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Natural gypsum is more expensive from mining to entering the factory; in addition, some cement needs to be mixed with slag and other admixtures, but the early strength of the admixture is low and the amount of admixture is limited, which makes the production cost of cement remain high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Take 94 parts of phosphogypsum, 3 parts of lime, and 3 parts of slag according to the weight ratio, mix and stir the ingredients evenly, extrude them into bricks, and dry them naturally at room temperature to obtain modified phosphogypsum bricks with a moisture content of 8.9wt%, soluble P 2 o 5 0.05wt%, PH value = 8.0, SO 3 : 36.79wt%.

Embodiment 2

[0016] Take 95 parts of phosphogypsum, 2 parts of alkali slag, and 3 parts of slag according to the weight ratio. 2 o 5 0.06wt%, PH value = 8.2, SO 3 : 37.0wt%.

Embodiment 3

[0018] According to the weight ratio, take 91 parts of phosphogypsum, 3 parts of lime, 4 parts of fly ash, and 2 parts of aluminum slag. After the ingredients are mixed and stirred evenly, they are extruded into bricks and dried naturally to obtain modified phosphogypsum bricks. The water content is 8.4wt. %, soluble P 2 o 5 0.04wt%, PH value 7.6, SO 3 : 36.3wt%.

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PUM

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Abstract

The present invention relates to a modified phosphogypsum brick and its use as cement retarder. Said modified phosphogysum brick comprises 80-95 wt% of phosphogypsum, 2-15 wt% of reinforcing agent and 3-10 wt% of modifiying agent. Said material mixture (100 wt%) is undergone the processes of forming and naturally-drying to obtain the invented product. The water content of said modified phosphogypsum brick is less than 10 wt%, SO3 is greater than 35 wt%, pH is greater than 7, P2O5 is less than 0.1 wt%. Said modified phosphogypsum brick is convenient for storage and transportation, can be used as cement retarder for production of cement instead of natural gypsum, and can reduce cement cost and raise cement property.

Description

technical field [0001] The invention relates to the utilization technology of phosphogypsum, a by-product of phosphorus chemical industry, in particular to the application of phosphogypsum modified into bricks and used as a cement retarder. Background technique [0002] Phosphogypsum is industrial waste slag discharged during the production process of phosphorus chemical enterprises. The current stacking not only takes up a lot of space and funds, but also pollutes the environment. The main components in phosphogypsum are the same as natural dihydrate gypsum. In cement production, natural gypsum is used as a retarder to make the performance of the factory cement meet the national standard. Natural gypsum is more expensive from mining to entering the factory; in addition, some cement needs to be mixed with slag and other admixtures, but the early strength of the admixture is low and the amount of admixture is limited, which makes the production cost of cement remain high. P...

Claims

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Application Information

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IPC IPC(8): C04B22/14
CPCC04B2103/20C04B22/144
Inventor 杨淑珍宋汉唐杨新亚朱教群孙勇李永翔
Owner WUHAN UNIV OF TECH
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