CaSO* crystal whisker with desulfurized gypsum as raw material and preparing method

A technology for desulfurizing gypsum and calcium sulfate whiskers, which is applied in chemical instruments and methods, single crystal growth, crystal growth, etc. It can solve the problems of certain requirements for equipment compressive strength and inconvenient operation, and achieves mild conditions and easy operation. The effect of simplicity and short process flow

Inactive Publication Date: 2009-10-07
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] At present, the preparation of calcium sulfate whiskers from desulfurized gypsum mainly adopts hydrothermal reaction in a high-pressure reactor, such as the patented technology of "Method for preparing calcium sulfate whiskers using flue gas desulfurized gypsum" (CN 200810011193.5). The disadvantage is high temperature and pressure, which has certain requirements on the compressive strength of the equipment, and the operation is inconvenient

Method used

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  • CaSO* crystal whisker with desulfurized gypsum as raw material and preparing method
  • CaSO* crystal whisker with desulfurized gypsum as raw material and preparing method
  • CaSO* crystal whisker with desulfurized gypsum as raw material and preparing method

Examples

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Embodiment 1

[0023] A kind of CaSO using desulfurized gypsum as raw material 4 Whiskers and their preparation method: first fully mix desulfurization gypsum, water and crystallization agent to form a suspension, wherein: the mass concentration of desulfurization gypsum is 1-3%, and the mass concentration of crystallization agent is 5-9%;

[0024] Under normal pressure, 100-128°C and a stirring rate of 120-160r / min, stir the above suspension for 3-5 hours, add sodium oleate with a mass of 0.5-0.7% of the suspension, and stir for 0.5-0.6 hours ; Then filter and wash, and finally dry at 45-60°C for 2-4 hours to obtain calcium sulfate hemihydrate whiskers.

[0025] The composition and mass concentration of the crystallization agent in this embodiment are: sulfuric acid 1-3%, calcium chloride 4-6%.

[0026] The CaSO prepared in this example 4 Whiskers, the length of which is 280-300 μm, the diameter is 1-4 μm, the modified CaSO 4 Whiskers have good stability and compatibility.

Embodiment 2

[0028] A kind of CaSO using desulfurized gypsum as raw material 4 Whiskers and their preparation method: first fully mix desulfurization gypsum, water and crystallization agent to form a suspension, wherein: the mass concentration of desulfurization gypsum is 1-3%, and the mass concentration of crystallization agent is 5-9%;

[0029] Under the conditions of normal pressure, 100-128°C and stirring rate of 140-180r / min: Stir the above suspension for 1-3 hours, add calcium sulfate whiskers with a mass of 0.5-1% of the suspension as seeds, and react After 1-3 hours, add sodium oleate with a mass of 0.5-0.7% of the suspension, and stir for 0.5-1 hour. Then, it is filtered and washed, and finally dried at 45-60° C. for 2-4 hours to obtain calcium sulfate hemihydrate whiskers.

[0030] The composition and mass concentration of the crystallization agent in this embodiment are: sulfuric acid 1-3%, calcium chloride 4-6%.

[0031] The CaSO prepared in this example 4 Whiskers, the whis...

Embodiment 3

[0033] A kind of CaSO using desulfurized gypsum as raw material 4 Whiskers and their preparation method: first fully mix desulfurized gypsum, water and crystallization agent to form a suspension, wherein the mass concentration of desulfurization gypsum is 2-5%, and the mass concentration of crystallization agent is 8-10%.

[0034] Under the conditions of normal pressure, 100-128°C and a stirring rate of 140-180r / min, the above suspension was stirred for 5-7 hours, and sodium dodecylbenzenesulfonate with a mass of 0.8-1% of the suspension was added, Stir for 0.6-0.7 hours; then filter and wash, and finally dry at 60-400°C for 2-4 hours to obtain anhydrous soluble calcium sulfate whiskers.

[0035] The composition and mass concentration of the crystallization agent in this embodiment are: 1-1.5% of sulfuric acid, 5-6% of calcium chloride, and 2-2.5% of magnesium chloride.

[0036] The CaSO prepared in this example 4 Whiskers, the whisker length is 200-240 μm, the diameter is 3...

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Abstract

The present invention relates to a CaSO4 crystal whisker with desulfurized gypsum as raw material and a preparing method. A technical scheme includes: mixing desulfurized gypsum, water and habit modifier fully for forming suspension; wherein, mass concentration of desulfurized gypsum is 1-8%, mass concentration of habit modifier is 5-20%; or stirring the above suspension 1-3 hours under conditions of normal pressure, 100-128 deg c and 120-210 r / min stirring speed, adding calcium sulphate crystal whisker by weight of 0.5-1% as inoculating crystal, reacting 1-3 hours, adding modifying agent, or stirring the above suspension 3-8 hours, adding the modifying agent directly; or stirring the above suspension 3-8 hours, and adding the modifying agent directly, the amount of the modifying agent is 0.4-1% of the suspension weight, stirring 0.5-1 hours; then pump filtering, washing and three-section drying for obtaining three various type calcium sulphate crystal whisker. The method uses a normal pressure salt solution crystallization method for preparing CaSO4 crystal whisker which has short process flow, geniality condition and low cost, and is an efficient purpose for realizing resource utilizing.

Description

technical field [0001] The present invention belongs to CaSO 4 Technical field of whisker preparation. Especially relate to a kind of CaSO2 with desulfurization gypsum as raw material 4 Whiskers and methods for their preparation. Background technique [0002] The proportion of coal in my country's energy consumption is about 70%, and my country's SO 2 90% of the emissions come from the burning of coal. Flue gas desulfurization technology is to control SO 2 The main method of pollution. At present, 85% of domestic flue gas desulfurization technologies are wet limestone / gypsum processes. This process handles 1t of SO 2 Will produce desulfurization gypsum 2.7t. With the increasing installed capacity of thermal power plants in my country, it is estimated that by 2010, the annual output of desulfurized gypsum and other by-product gypsum will exceed 100 million tons. The comprehensive utilization of by-product gypsum is not only a prerequisite for the normal operation of de...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B29/62C30B29/46C30B1/04
Inventor 吴晓琴裘建军张春桃童仕唐官宝红吴忠标
Owner WUHAN UNIV OF SCI & TECH
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