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Method for preparing calcium sulphate whiskers used for absorbing heavy metal ions in waste incineration flue gas

A technology for calcium sulfate whiskers and heavy metal ions, which is applied in separation methods, alkali metal compounds, chemical instruments and methods, etc., can solve the problem of complex preparation and modification process of non-activated carbon adsorbents, unrealized industrial application, and unsatisfactory adsorption efficiency and other problems to achieve the effect of shortening the reaction cycle, short preparation cycle and easy control

Inactive Publication Date: 2012-05-09
SHANDONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the problems of complex preparation and modification process, high production cost, and unsatisfactory adsorption efficiency, the above-mentioned non-activated carbon adsorbents have not been industrialized at present.

Method used

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  • Method for preparing calcium sulphate whiskers used for absorbing heavy metal ions in waste incineration flue gas
  • Method for preparing calcium sulphate whiskers used for absorbing heavy metal ions in waste incineration flue gas
  • Method for preparing calcium sulphate whiskers used for absorbing heavy metal ions in waste incineration flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Weigh 30g of industrial desulfurized gypsum with an average particle size of 50μm, add it to 1L of water and dissolve it fully to form a slurry, add the slurry to the microwave reactor, and then add 0.02molMgCl 2 As a whisker morphology regulator, drop sodium hydroxide solution to adjust the pH value of the slurry to 8; start the stirring device, control the stirring rate to 200rpm, and raise the temperature in the microwave reactor to 130 under normal pressure. ℃, and continue to react at this temperature for 1 h. After the reaction is completed, cool and filter to obtain the crude product of calcium sulfate whiskers (unmodified calcium sulfate whiskers). Then the calcium sulfate whisker crude product that makes is soaked in the NaOH solution of 0.1mol / L in 250ml concentration for 24h, after soaking finishes, take out and dry naturally, put into the muffle furnace then, under the condition of cutting off oxygen, put the horse Furnace is heated up to 700 DEG C, and acti...

Embodiment 2

[0021] Weigh 40g of industrial desulfurized gypsum with an average particle size of 40μm, add it to 1L of water and dissolve it fully to form a slurry, add the slurry to the microwave reactor, and then add 0.03molK 2 SO 4 As a whisker morphology regulator, drop sodium hydroxide solution to adjust the pH value of the slurry to 9; start the stirring device, control the stirring rate to 300rpm, and raise the temperature in the microwave reactor to 130 under normal pressure. ℃, and continue to react at this temperature for 1.5h. After the reaction is completed, cool and filter to obtain the crude product of calcium sulfate whiskers. Then the calcium sulfate whisker crude product that makes is soaked in the NaOH solution of 0.2mol / L in 200ml concentration for 48h, after soaking finishes, take out and dry naturally, put into the muffle furnace then, under the condition of cutting off oxygen, put the horse Furnace is heated up to 800°C and activated at this temperature for 3 hours t...

Embodiment 3

[0025] Weigh 60g of industrial desulfurized gypsum with an average particle size of 30μm, add it into 1L of water and dissolve it fully to form a slurry, add the slurry into the microwave reactor, and then add an appropriate amount of 0.05molK 2 SO 4 As a whisker morphology regulator, drop sodium hydroxide solution to adjust the pH value of the slurry to 10; start the stirring device, control the stirring rate to 400rpm, and raise the temperature in the microwave reactor to 130 under normal pressure. ℃, and continue to react at this temperature for 2 hours. After the reaction is completed, cool and filter to obtain the crude product of calcium sulfate whiskers. Then the calcium sulfate whisker crude product that makes is soaked in 200ml concentration and is the NaOH solution of 0.3mol / L 72h, take out after soaking and dry naturally, put into the muffle furnace then, under the condition of cutting off oxygen, put the horse Furnace is heated up to 900°C and activated at this te...

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Abstract

The invention discloses a method for preparing calcium sulphate whiskers used for absorbing heavy metal ions in a waste incineration flue gas. The method comprises the following steps of: selecting a gypsum raw material; mixing the gypsum raw material and water to prepare slurry with the weight percentage concentration of 2 percent to 6 percent; putting the slurry into a microwave reactor; stirring and heating the slurry at the temperature of between 120 and 130 DEG C for 1 to 2 hours to prepare a crude product of the calcium sulphate whiskers; soaking the crude product of the calcium sulphate whiskers in alkaline solution for a certain time; and after taking out and drying naturally, activating the calcium sulphate whiskers at a high temperature in a muffle furnace to prepare a finished product of the calcium sulphate whiskers used for absorbing the heavy metal ions in the waste incineration flue gas. The finished product of the calcium sulphate whiskers prepared by using method has the characteristics of larger specific surface area, developed pore structure, capability of effectively adsorbing the heavy metal ions in the waste incineration flue gas, and equivalent adsorption effect to that of activate carbon.

Description

technical field [0001] The invention relates to a method for preparing calcium sulfate whiskers, in particular to a method for preparing calcium sulfate whiskers for absorbing heavy metal ions in waste incineration flue gas. Background technique [0002] Heavy metals are one of the main pollutants in waste incineration flue gas. The adsorption method to capture heavy metal ions in waste incineration flue gas has become one of the main methods to control heavy metal pollution. The traditional adsorbent is activated carbon, which has strong adsorption capacity and high removal rate of heavy metals, but its application is greatly limited due to its high price. In recent years, a series of non-activated carbon solid adsorbents have been developed, mainly clay-based adsorbents, humic acid-based adsorbents, and waste adsorbents. Clay-based adsorbents mainly include oxides of metal ions such as Si, Al, Ca, and Mg, such as montmorillonite, kaolin, attapulgite, etc.; humic acid-base...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B29/46C30B29/62B01J20/04B01J20/28B01D53/02B01J20/30
Inventor 张华伟王力张俊才李利风宋建国赵宝杰
Owner SHANDONG UNIV OF SCI & TECH
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