Method for preparing high-strength gypsum by adopting atmospheric pressure solution method

A high-strength gypsum and solution method technology, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of large initial investment, lengthy process, and complicated equipment, and achieve the effect of simple equipment, convenient operation, and easy control of conditions

Active Publication Date: 2014-08-06
WUHAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although the first three production processes are relatively mature, their practical application is greatly

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  • Method for preparing high-strength gypsum by adopting atmospheric pressure solution method
  • Method for preparing high-strength gypsum by adopting atmospheric pressure solution method
  • Method for preparing high-strength gypsum by adopting atmospheric pressure solution method

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Effect test

Embodiment 1

[0045] A method for preparing high-strength gypsum by atmospheric solution method, the steps are:

[0046] (1) Configure a compound chloride solution with a mass concentration of 5%, in which the mass ratio of the compound chloride salt is NaCl:LiCl=1:1, figure 1 Continue heating and stirring in the reactor shown. After the thermostatic heater is heated to 85°C, stabilize for 30 minutes, and use a mercury thermometer to help maintain a constant temperature;

[0047] (2) Under the condition of constant temperature and continuous stirring, slowly add flue gas desulfurization gypsum with a mass concentration of 5% and tartaric acid with a mass concentration of 0.1% to the composite chloride solution, and adjust the pH of the system with HCl and NaOH to make it Keep it in the range of 5-8, and the mixed slurry continues to react for 0.5h;

[0048] (3) The slurry in the reactor is quickly filtered in a sand core filter device, washed three times with near-boiling water (95℃-98℃), fixed b...

Embodiment 2

[0051] A method for preparing high-strength gypsum by atmospheric solution method, the steps are:

[0052] (1) Prepare a composite chloride solution with a mass concentration of 30%, in which the mass ratio of the composite chloride salt is MgCl 2 :CaCl 2 =1:1, in figure 1 Continuous heating and stirring in the reactor shown, after the constant temperature heater is heated to 96°C, stabilize for 30 minutes, and use a mercury thermometer to help maintain a constant temperature;

[0053] (2) Under the condition of constant temperature and continuous stirring, slowly add flue gas desulfurization gypsum with a mass concentration of 20%, sodium gluconate with a mass concentration of 0.2%, and 1% sodium alginate to the salt solution system, using HCl and NaOH Adjust the pH of the system to keep it in the range of 5-8, and the mixed slurry continues to react for 6 hours;

[0054] (3) The slurry in the reactor is quickly filtered in a sand core filter device, washed three times with near-bo...

Embodiment 3

[0057] A method for preparing high-strength gypsum by atmospheric solution method, the steps are:

[0058] (1) Prepare a composite chloride solution with a mass concentration of 30%, in which the mass ratio of the composite chloride salt is MgCl 2 :LiCl=4:1, in figure 1 Continue heating and stirring in the reactor shown. After the thermostatic heater is heated to 65°C, stabilize for 30 minutes, and use a mercury thermometer to help maintain a constant temperature;

[0059] (2) Under the condition of constant temperature and continuous stirring, slowly add 20% mass concentration of flue gas desulfurization gypsum and mass concentration of 0.1% tartaric acid, 0.05% sodium alginate to the salt solution system, and use HCl and NaOH to adjust the system Keep the pH in the range of 5-8, and the mixed slurry will continue to react for 2h;

[0060] (3) Quickly filter the slurry in the reactor, wash it with near-boiling water (95°C-98°C) for three times, add absolute ethanol to fix it, and p...

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Abstract

The invention provides a method for preparing high-strength gypsum by adopting an atmospheric pressure solution. The method comprises the following steps: preparing a composite chloride salt solution with a mass concentration of 5-30 %; stirring and heating the composite chloride salt solution to 65-96 DEC G and keeping the constant temperature stably for 30 min; then, adding flue gas desulfurization gypsum with the mass concentration of 5-20 % and organic acids crystal modifier with the mass concentration of 0.1-1.8 % to the composite chlorate solution; controlling the reaction temperature and keeping the reaction temperature at the pre-arranged temperature; in a reaction condition of 5 to 8 pH value and 0.5-6 h stirring time, quickly filtering the mixed slurry with hot water of 95-98 DEC G; obtaining the high-strength gypsum after drying and powder grinding. According to the invention, building materials recycling of the desulfurized gypsum and the high-strength gypsum is realized; the wastes are changed into valuable, so that the method provided by the invention has remarkable social, environmental and economic benefits; pressure vessels are not required during the technological process; the energy consumption is low; the equipment is simple; the operation is convenient; the reaction conditions are easy to control; the obtained product is uniform in crystal structure and stable in quality; the standard consistency of water is 43%; the rupture strength reaches 5.34 M pa within two hours; the absolutely dry strength of the high-strength gypsum reaches 30.21 M pa.

Description

technical field [0001] The invention relates to the technical field of building raw material preparation, in particular to a method for preparing high-strength gypsum by an atmospheric pressure solution method. Background technique [0002] As we all know, my country's energy structure is dominated by coal combustion, which generally has a high sulfur content, and the vast majority of sulfur dioxide emissions come from coal combustion, causing serious pollution. In order to solve the environmental problems caused by industrial waste gas, the government stipulates in legal form that the coal-fired flue gas must be desulfurized. At present, the leading technology for the prevention and control of flue gas pollution in domestic coal-fired power plants is the wet limestone-gypsum method, and its market share is as high as As a result, the output of desulfurization gypsum increases rapidly with the construction and operation of flue gas desulfurization equipment. [0003] Howeve...

Claims

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Application Information

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IPC IPC(8): C01F11/46
Inventor 周旻王小书侯浩波张维昊孙琪柯兴万沙韩毅
Owner WUHAN UNIV
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