Ardealite-based high-strength light building blocks prepared from ardealite and production process thereof

A production process and phosphogypsum technology, which is applied in the field of building materials to achieve the effects of low apparent density, high softening coefficient and good water resistance.

Inactive Publication Date: 2013-12-11
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Up to now, there has been no domestic patent on the preparation of high-strength lightweight blocks with phosphogypsum

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Phosphogypsum-based high-strength lightweight blocks prepared from phosphogypsum and its production process, the proportion of its components is as follows:

[0024] 1) Preparation of α-high-strength gypsum from phosphogypsum:

[0025] Modified phosphogypsum: 60%; water: 29.8%; calcium chloride: 10%; sodium citrate: 0.2%;

[0026] Put the raw materials into the reaction kettle according to the above ratio, stir and mix to make a slurry, heat up to 95°C, then keep it warm for 5 hours, and carry out hydrothermal reaction under normal pressure, so that the dihydrate gypsum is dehydrated and transformed into α high-strength gypsum; ℃ hot water washing, solid-liquid separation, to obtain α high-strength gypsum slurry;

[0027] 2) Use α high-strength gypsum slurry to prepare phosphogypsum-based high-strength lightweight blocks:

[0028] Take the α high-strength gypsum slurry obtained in the above step 1 as 51.9% on a dry basis of α high-strength gypsum; the remaining compon...

Embodiment 2

[0031] Phosphogypsum-based high-strength lightweight blocks prepared from phosphogypsum and its production process, the proportion of its components is as follows:

[0032] 1) Preparation of α-high-strength gypsum from phosphogypsum:

[0033] Modified phosphogypsum: 50%; water: 39.5%; calcium chloride: 10%; sodium citrate: 0.5%;

[0034] Put the raw materials into the reaction kettle according to the above ratio, stir and mix to make a slurry, heat up to 98°C, then keep it warm for 4 hours, and carry out hydrothermal reaction under normal pressure to dehydrate the dihydrate gypsum into α high-strength gypsum; ℃ hot water washing, solid-liquid separation, to obtain α high-strength gypsum slurry;

[0035] 2) Use α high-strength gypsum slurry to prepare phosphogypsum-based high-strength lightweight blocks:

[0036] Take the α high-strength gypsum slurry obtained in the above step 1 as 59.8% on a dry basis of α high-strength gypsum; the remaining component content is cement: 5%;...

Embodiment 3

[0039] Phosphogypsum-based high-strength lightweight blocks prepared from phosphogypsum and its production process, the proportion of its components is as follows:

[0040] 1) Preparation of α-high-strength gypsum from phosphogypsum:

[0041] Modified phosphogypsum: 40%; water: 44.8%; calcium chloride: 15%; sodium citrate: 0.2%;

[0042] Put the raw materials into the reaction kettle according to the above ratio, stir and mix to make a slurry, heat up to 92°C, then keep it warm for 6 hours, and carry out hydrothermal reaction under normal pressure to dehydrate the dihydrate gypsum into α high-strength gypsum; ℃ hot water washing, solid-liquid separation, to obtain α high-strength gypsum slurry;

[0043] 2) Use α high-strength gypsum slurry to prepare phosphogypsum-based high-strength lightweight blocks:

[0044] Take the α high-strength gypsum slurry obtained in the above step 1 as 69.7% on a dry basis of α high-strength gypsum; the content of the remaining components is cem...

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Abstract

The invention relates to an ardealite-based high-strength light building block prepared from ardealite and a production process thereof. The ardealite-based high-strength light building block is prepared from the following raw material components by weight percent: 50-70% of dry basis of alpha high-strength gypsum, 3-10% of cement, 10-20% of coal ash, 10-20% of glass beads and 0.1-0.4% of air entraining agent. The raw materials are mixed together evenly in a water-material ratio from 0.4 to 0.6 and stirred into slurry; then the slurry is moulded to form the ardealite-based high-strength light building block. The ardealite-based high-strength light building block produced through the production process provided by the invention is found by detection that the apparent density of the solid building block is not higher than 1000 kg/m<3>, the strength grade is above MU10, the softening coefficient is not lower than 0.6 and the utilization rate of the solid waste is more than 70%.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a phosphogypsum-based high-strength lightweight block prepared by using phosphogypsum and a production process thereof. Background technique [0002] Phosphogypsum is a solid waste mainly composed of calcium sulfate dihydrate discharged from the wet-process phosphoric acid production process. Normally, the production of 1 ton of P 2 o 5 It is necessary to discharge 4.5 to 5.5 tons of phosphogypsum. In recent years, with the continuous development of the phosphating industry, the discharge of phosphogypsum in my country has been increasing day by day. In 2009, the output of phosphogypsum in my country was about 50 million tons, and the cumulative stockpiled amount has exceeded 200 million tons, occupying a large amount of land resources. At present, domestic phosphogypsum is mainly dehydrated by high temperature heat treatment to generate β hemihydrate gy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B14/42
Inventor 马保国卢斯文茹晓红李玉博郅真真苏英蹇守卫
Owner WUHAN UNIV OF TECH
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