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Semi-hydrated gypsum with photocatalytic activity and application thereof

A technology of photocatalytic activity and hemihydrate gypsum, applied in the field of hemihydrate gypsum, can solve the problems of low utilization efficiency of titanium dioxide gypsum, destruction of ecological balance, pollution of the environment, etc., to achieve improved waterproof effect, small thermal conductivity and high strength Effect

Active Publication Date: 2014-07-23
南通高创环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low efficiency of resource utilization of titanium dioxide gypsum, concentrated stacking is often used, which not only occupies a large amount of land, pollutes the environment, and destroys ecological balance, but also causes a huge economic burden on titanium dioxide enterprises.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] 100% titanium dioxide gypsum is burned to 450°C, crushed, vibrating and sieved to make it 40 microns. Put it in an autoclave, feed it with saturated steam, heat it at 125°C and 2.8 kPa vapor pressure for 3 hours, then grind it with beads, dry it at 140°C, grind and crush it, and vibrate and sieve it to 10 microns to obtain hemihydrate gypsum. 12.5g of pyrite was pulverized, vibrated and sieved to make it 16 microns. After mixing 2.8 kg of organic water repellent butyl acrylate with water, add 0.2 kg of sodium dodecylbenzenesulfonate, raise the temperature to 70°C and stir at high speed for 40 minutes, then keep it warm for 1 hour, lower it to room temperature and adjust the pH to 7.5, and filter. Add the above-mentioned water repellent filtrate, crushed iron ore and 0.5 kg chitosan to the water successively, and stir to make it fully mix evenly. The prepared hemihydrate gypsum was added to the above solution, stirred for 3 minutes, poured into the mold, vibrated and fo...

Embodiment 2

[0025] The preparation steps are as in Example 1, only the following steps are different:

[0026] Burn the titanium dioxide gypsum to 550°C, crush it to 65 microns, place it in an autoclave, feed saturated steam, keep it at 135°C and 2.1 kPa steam pressure for 3.5 hours, then dry it at 132°C, grind and crush it, Vibrating and sieving to make it 2 micron hemihydrate gypsum; crush the hematite, vibrate and sieve it to make it at 12 micron, then calcinate at 480°C for 3 h, grind and pulverize, and vibrate and sieve to 8 micron. After mixing 0.8 kg of propylene acetate with water, add 0.3 kg of sodium dodecylbenzenesulfonate, raise the temperature to 80 °C and stir at high speed for 40 min, then keep it warm for 1 h, lower it to room temperature and adjust the pH to 7.5, and filter. Add the above-mentioned waterproofing agent to the water successively, and mix the pulverized iron ore, 0.2 kg chitin, and 0.6 kg glucose solution, and stir to make it fully mixed. The prepared hemih...

Embodiment 3

[0028] The preparation steps are as in Example 1, only the following steps are different:

[0029]Burn the titanium dioxide gypsum to 600°C, pulverize, vibrate and sieve to make it 85 microns, put it in an autoclave, feed saturated steam, keep it at 135°C and 2.1 kPa steam pressure for 3.5 hours, and then dry it at 132°C. Grinding and crushing, vibration sieving to 10 micron hemihydrate gypsum. 20 g of magnetite and 130 g of hematite were pulverized and mixed, vibrated and sieved to make it at 22 microns, calcined at 350 ° C for 1 h, and ball milled to 10 microns. After mixing 2.8 kg of organic water repellent butyl acrylate with water, add 0.2 kg of sodium dodecylbenzenesulfonate, raise the temperature to 70°C and stir at high speed for 40 minutes, then keep it warm for 1 hour, lower it to room temperature and adjust the pH to 7.5, and filter. Add the above-mentioned water repellent in turn, the pulverized iron ore and 0.5 kg chitosan into the water, and stir to make it full...

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Abstract

The invention relates to a gypsum product with photocatalytic activity and an application thereof. Titanium white gypsum produced by utilizing a sulfuric acid method of a titanium white plant is taken as a raw material for converting the titanium white gypsum into semi-hydrated gypsum, so that strength of the gypsum is increased; a qualified building block or a plate material with waterproof performance is manufactured by adding a waterproof agent, a retarder and a foaming agent, and an exterior-wall thermal insulation layer is prepared by adding the foaming agent. Catalytic oxidization ability of titanium dioxide and iron oxide in the titanium white gypsum is utilized, so that catalytic activity of the gypsum after adding natural iron ore is strengthened, and therefore, the semi-hydrated gypsum can be used for degrading toxic organic pollutants of a building material in the sun or the visible light.

Description

technical field [0001] The invention relates to a hemihydrate gypsum product and its application, in particular to hemihydrate gypsum with photocatalytic activity, which can be used for building materials to degrade toxic organic pollutants under sunlight or visible light. Background technique [0002] Gypsum raw materials are divided into natural gypsum and chemical gypsum. The main component of natural gypsum is CaSO 4 2H 2 O, also known as raw gypsum, can be calcined and ground to obtain hemihydrate gypsum (CaSO 4 1 / 2H 2 o). It is an air-hardening gelling material with two forms of α and β, both of which are rhombohedral crystals, but with different physical properties. The α-type hemihydrate gypsum crystallizes well and is solid; the β-type hemihydrate gypsum is a flaky crystal with cracks, the crystal is very fine, and the specific surface area is much larger than that of the α-type hemihydrate gypsum. Chemical gypsum can be divided into phosphogypsum, desulfuriza...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B24/38C04B24/04
Inventor 刘立明黄应平黄绪泉欧阳兆辉张恒明
Owner 南通高创环保科技有限公司
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