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Method of synthesizing calcium sulfate whiskers in one step by means of sintering flue gas desulfurization ash

A calcium sulfate whisker and sintering flue gas technology, applied in chemical instruments and methods, single crystal growth, crystal growth, etc., can solve the problems of poor quality of calcium sulfate whisker, improve quality, increase friction, and promote adsorption Effect

Active Publication Date: 2018-12-25
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims at the poor quality problem of preparing calcium sulfate whiskers from desulfurization ash in the prior art, and provides a method for synthesizing calcium sulfate whiskers in one step by sintering flue gas desulfurization ash. The present invention removes iron from desulfurization ash, And use the hydrothermal system oxidation to synergistically prepare calcium sulfate whiskers, improve the quality of calcium sulfate whiskers, and reduce the environmental pollution of desulfurization ash during the preparation process

Method used

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  • Method of synthesizing calcium sulfate whiskers in one step by means of sintering flue gas desulfurization ash
  • Method of synthesizing calcium sulfate whiskers in one step by means of sintering flue gas desulfurization ash
  • Method of synthesizing calcium sulfate whiskers in one step by means of sintering flue gas desulfurization ash

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Embodiment 1

[0056] Such as figure 1 As shown, a method of the present invention for synthesizing calcium sulfate whiskers by one-step method using sintered flue gas desulfurization ash, the desulfurization ash referred to in this embodiment is sintered flue gas desulfurization ash.

[0057] Step 1: Desulfurization Ash Pretreatment

[0058] The iron powder in the desulfurization ash is separated from the desulfurization ash, the large insoluble matter in the desulfurization ash is removed, and the pretreated desulfurization ash is obtained; the detailed steps are:

[0059] (1) desulfurization ash is added in the desulfurization gray iron powder separating device, open electromagnet, open the air valve of blowback gas tank 410 simultaneously, the blowback airflow in the blowback gas tank 410 enters the electromagnet iron core 205 through pipeline In the barrel core, the blowback air flow overflows from the air hole 204 on the surface of the iron core 205 to the outside of the electromagnet...

Embodiment 2

[0087] The basic content of this embodiment is the same as embodiment 1, as Figure 4 and 5 As shown, the difference is that the desulfurization ash is added to the desulfurization gray iron powder separation device, and when the desulfurization ash moves to the lower part of the iron powder recovery cavity 200, the desulfurization ash moves to the first electromagnet 210 and the second electromagnet 220 around, the iron powder in the desulfurization ash is adsorbed on the surface of the cotton sleeve 203 by the first electromagnet 210 and the second electromagnet 220; When the third electromagnet 230 is around, the iron powder in the desulfurization ash is adsorbed on the surface of the third electromagnet 230; the desulfurization ash passes through the gap between the first electromagnet 210 and the second electromagnet 220 , move to the connection between the left electromagnet 231 and the right electromagnet 232, and be adsorbed on the surface of the connection, which imp...

Embodiment 3

[0097] The basic content of this embodiment is the same as that of Embodiment 1, and the difference is that: the blowback gas tank 410 is connected with an airflow main pipe 420, and the airflow main pipe 420 is connected with a first airflow branch pipe 421 and a second airflow branch pipe 422, and the first airflow branch pipe 421 communicates with both ends of the iron core 205 of the third electromagnet 230. It is worth noting that: the first air flow branch pipe 421 communicates with the cylinder core of the iron core 205, the cylinder core is a hollow channel, and the surface of the cylinder core and the iron core 205 Vent hole 204 is communicated with each other, and the position that the first air flow branch pipe 421 is connected with cylinder core is provided with seal ring, avoids that blowback airflow leaks from the two ends of iron core 205 cylinder cores; It communicates with the iron core 205 of the second electromagnet 220 , that is, the second air branch pipe 4...

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Abstract

The invention discloses a method of synthesizing calcium sulfate whiskers in one step by means of sintering flue gas desulfurization ash and belongs to the technical field of resource recycling. Pretreated desulfurization ash and MgCl2 solution are mixed well to obtain a slurry; saturated Ca(OH)2 is dropwise added into the slurry to adjust the pH of the slurry to 8-9; the slurry is transferred into a high-pressure reactor; hydrothermal synthesis is carried out to obtain calcium sulfate whiskers. The sintering flue gas desulfurization ash is used as a raw material to calcium sulfate whiskers through cooperation of hydrothermal system oxidation; the preparation of calcium sulfate whiskers through the cooperation of sintering flue gas desulfurization ash oxidation is achieved; the problems that CaSO3 is difficult to oxidize quickly and a calcium sulfate whisker preparation process has a long flow are solved; recycling rate of desulfurization ash is increased; the quality of calcium sulfate whiskers is improved.

Description

technical field [0001] The invention relates to the field of resource recovery and reuse, and more specifically relates to a method for synthesizing calcium sulfate whiskers in one step by using sintered flue gas desulfurization ash. Background technique [0002] With the state on SO 2 With the strengthening of pollution control and the strengthening of our country's awareness of environmental protection, the research on the comprehensive utilization of sinter flue gas desulfurization ash has gradually attracted people's attention, and the utilization of sinter flue gas desulfurization ash can reduce the funds consumed by stacking and occupy land and environmental pollution, reduce the amount of natural gypsum, thereby reducing the amount of natural gypsum mining, and protect the ecological environment. Therefore, many universities and enterprises have conducted a lot of research on the comprehensive utilization of sinter flue gas desulfurization ash, such as the use of sin...

Claims

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Application Information

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IPC IPC(8): C30B29/46C30B29/62C30B7/10
CPCC30B7/10C30B29/46C30B29/62
Inventor 龙红明魏汝飞章裕东王毅璠王平孟庆民春铁军狄瞻霞余正伟钱立新
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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