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Modified phosphogypsum and preparation method thereof

A phosphogypsum and modification technology, which is applied in the field of modified phosphogypsum and its preparation, can solve the problems of low active aluminum content and ideal setting time of phosphogypsum-based cement concrete, and achieve low cost, shortened setting time, and mixed less effect

Inactive Publication Date: 2012-10-24
武汉亿胜科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

"However, since the content of active aluminum in phosphogypsum steel slag is very low, only the reaction of active calcium in steel slag with acidic substances in phosphogypsum is not enough to make the setting time of phosphogypsum-based cement concrete reach an ideal level.

Method used

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  • Modified phosphogypsum and preparation method thereof
  • Modified phosphogypsum and preparation method thereof
  • Modified phosphogypsum and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Preparation of modified phosphogypsum (modified phosphogypsum slurry): Measure the free water content of phosphogypsum (taken from Hubei Huangmailing Phosphorus Chemical Co., Ltd.), and then mix it with slag Portland cement according to the ratio in Table 1 , plus 60% of water (free water in phosphogypsum, the amount of water added is 60% of the total mass of phosphogypsum and slag portland cement), wet ground into phosphogypsum slurry, stirred evenly and according to Table 1 Aging time After aging, a modified phosphogypsum is obtained.

[0022]Prepare phosphogypsum-based cement concrete according to the mix ratio in Table 2. Then measure the setting time of the phosphogypsum-based cement concrete mixture according to GB / T 50080-2002 "Standards for Test Methods of Properties of Ordinary Concrete Mixtures"; The strength of gypsum-based cement concrete is shown in Table 2.

[0023] Table 1 Proportion of phosphogypsum slurry

[0024]

[0025] The BASF described in Ta...

Embodiment 2

[0030] Preparation of modified phosphogypsum (modified phosphogypsum slurry): measure the free water content of phosphogypsum (taken from Huangmailing Phosphorus Chemical Co., Ltd. After mixing according to the ratio in Table 4, add 60% water (free water in phosphogypsum, the amount of water added is 60% of the total mass of phosphogypsum and general-purpose Portland cement), and wet grind to make phosphogypsum slurry , stirred evenly and aged according to the aging time in Table 4, the modified phosphogypsum was obtained.

[0031] Clinker powder, slag powder, limestone powder, fly ash, and natural gypsum are made into various general-purpose Portland cements according to the ratio in Table 3, and then made into phosphogypsum slurry according to the ratio in Table 4, and stirred evenly. After a certain period of time, modified phosphogypsum (modified phosphogypsum slurry) is obtained. Prepare phosphogypsum-based cement concrete according to the mix ratio in Table 5. Then mea...

Embodiment 3

[0041] Preparation of modified phosphogypsum (modified phosphogypsum slurry): measure the free water content of phosphogypsum (taken from Hubei Huangmailing Phosphorus Chemical Co., Ltd.), and then mix it with slag portland cement according to the ratio in Table 6 , add different water (free water in phosphogypsum), wet grind into phosphogypsum slurry, stir evenly and age according to the aging time in Table 6 to obtain modified phosphogypsum slurry.

[0042] Prepare phosphogypsum-based cement concrete according to the mix ratio in Table 7. Then measure the setting time of the phosphogypsum-based cement concrete mixture according to GB / T 50080-2002 "Standards for Test Methods of Properties of Ordinary Concrete Mixtures"; The strength of gypsum-based cement concrete is shown in Table 7.

[0043] Table 6 Proportion of phosphogypsum slurry

[0044]

[0045] The BASF described in Table 7 is a commercially available concrete admixture with polycarboxylic acid as the main compo...

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Abstract

The invention belongs to the field of building materials and concretely relates to modified phosphogypsum and a preparation method thereof. The modified phosphogypsum is characterized by being formed by mixing, wetly grinding and then aging phosphogypsum, general-purpose silicate cement and water, wherein the accounted dry-basis mass percentages of the phosphogypsum and the general-purpose silicate cement are as follows: 95-99 percent of phosphogypsum and 1-5 percent of general-purpose silicate cement, and the sum of the accounted dry-basis mass percentages of the phosphogypsum and the general-purpose silicate cement is 100 percent; and the addition quantity of the water is 50-70 percent of the total mass of the phosphogypsum and the general-purpose silicate cement, and the addition quantity of the water includes the quantity of free water in the phosphogypsum. The method has the advantages of simple process, no need of high-temperature curing, less admixture dosage and low cost, and the coagulating time of phosphogypsum-based cement concrete can be shortened by the modified phosphogypsum which is prepared by the method.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a modified phosphogypsum and a preparation method thereof. Background technique [0002] Phosphogypsum is an industrial by-product of wet process production of phosphoric acid in the phosphating industry, and its main component is dihydrate gypsum (Ca 2 SO 4 2H 2 O), usually dihydrate gypsum in phosphogypsum is 85% to 95%, and contains a small amount of impurities such as phosphorus, fluorine, and organic matter, and its content is related to the composition of the phosphate rock used in production. At present, the annual by-product of phosphogypsum in my country exceeds 50 million tons, and only about 20% of it is used. A large amount of phosphogypsum is stored as solid waste. The cumulative stockpiled phosphogypsum has exceeded 200 million tons. cause environmental pollution. Accelerating the resource utilization of phosphogypsum has become an urgent problem to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/30C04B11/26
Inventor 林宗寿
Owner 武汉亿胜科技有限公司
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