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Process for promoting oxidation and crystallization of calcium sulfite produced in carbide slag flue gas desulphurization

A technology of calcium sulfite and process methods, applied in chemical instruments and methods, separation methods, and dispersed particle separation, etc., can solve the problems of no investigation of catalyst reutilization rate, no inspection of oxidation rate, and no attention to the crystal form of desulfurized gypsum. Achieve the effects of shortening crystal growth time, good gypsum quality, and increasing oxidation rate and oxidation rate

Inactive Publication Date: 2012-10-17
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The object of the above-mentioned patent is limestone. It only studied the oxidation rate of calcium sulfite, and did not examine the oxidation rate, nor the reutilization rate of the catalyst, and did not pay attention to the crystal form of desulfurization gypsum, that is, the quality of gypsum.

Method used

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  • Process for promoting oxidation and crystallization of calcium sulfite produced in carbide slag flue gas desulphurization
  • Process for promoting oxidation and crystallization of calcium sulfite produced in carbide slag flue gas desulphurization
  • Process for promoting oxidation and crystallization of calcium sulfite produced in carbide slag flue gas desulphurization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Weigh about 5.0g of calcium carbide slag to fully absorb SO 2 After about 12 hours (hours), prepare a calcium sulfite slurry with a concentration of 0.02mol / L. Use acetic acid to adjust the pH value of the system at 4.0, 4.5 and 5.0, keep the temperature at 50 ° C, and feed air, by Figure 4 It can be seen that the oxidation rates of calcium sulfite in 2 hours were 61.0%, 44.8% and 40.9%, respectively, and the oxidation rates were 0.497% / min, 0.388% / min and 0.342% / min. In the following examples, pH=4.0 is taken as an example for discussion.

Embodiment 2

[0032] Weigh about 2.5, 5.0 and 12.5g of calcium carbide slag to fully absorb SO 2 After about 6, 12 and 30 hours, prepare calcium sulfite slurries with concentrations of 0.01, 0.02 and 0.05 mol / L. Use acetic acid to adjust the pH value of the system at 4.0, keep the temperature at 50°C, and feed air, by Figure 5 It can be seen that the oxidation rates of different concentrations of calcium sulfite in 2 hours were 93.1%, 61.0% and 27.6%, and the oxidation rates were 0.705% / min, 0.497% / min and 0.206% / min, respectively. SEM was used to observe the crystal form of desulfurized gypsum when the concentration of calcium sulfite was 0.02mol / L (no catalyst was added). image 3 a It can be seen that the gypsum is clustered without crystallization, and its quality is poor. In the following examples, the calcium sulfite concentration is 0.02 mol / L as an example.

Embodiment 3

[0034] Weigh about 5.0g of calcium carbide slag to fully absorb SO 2 After about 12 hours, prepare a calcium sulfite slurry with a concentration of 0.02mol / L. Use acetic acid to adjust the pH value of the system at 4.0, keep the temperature at 50°C, blow in air, and add MnSO 4 solution, so that the Mn in the whole system 2+ Concentration is 0.001mol / L, byfigure 1 and figure 2 It can be seen that the oxidation rate of calcium sulfite in 2h is 78.8%, and the oxidation rate is 0.627% / min. Using ICP to test Mn in the filtrate after slurry filtration for desulfurization gypsum 2+ Concentration, when the Mn 2+ The concentration is the initial addition of Mn 2+ 78.2% of the concentration, namely Mn 2+ The remaining rate is 78.2%. It shows that after one use, there is still 78.2% of Mn 2+ Can be recycled. Using SEM observation using MnSO 4 Catalyst desulfurization gypsum crystal form, by image 3 It can be seen from b that the gypsum presents acicular crystal form and is o...

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Abstract

The invention provides a process for promoting oxidation and crystallization of calcium sulfite produced in carbide slag flue gas desulphurization. According to the invention, a soluble salt catalyst is added into desulphurization slurry obtained after absorption of SO2, and the soluble salt catalyst is one selected from the group consisting of a manganese salt, a ferric salt, a copper salt, a cobalt salt and a mixture of a manganese salt and a ferric salt mixed according to a certain ratio; the concentration of the catalyst in the desulphurization slurry is controlled to be 0.0005 to 0.001 mol / L, the pH value of the slurry is controlled to be 4.0 to 5.0, and the temperature of the slurry is controlled to be 50 DEG C; when only one soluble salt catalyst selected from the above-mentioned group is used, the highest oxidation ratio of calcium sulfite reaches 78.8% while the oxidation rate of calcium sulfite is 0.627% / min in 2 h; and when the mixture of the manganese salt and the ferric salt mixed according to a mol ratio of 2: 1 is added into a reaction system, the oxidation ratio of calcium sulfite reaches 99.4% while the oxidation rate of calcium sulfite is 0.790% / min in 2 h, and desulfurized gypsum is of an acicular crystal form and has a great size. The process provided in the invention can substantially improve the oxidation ratio and the oxidation rate of calcium sulfite and the quality of the desulfurized gypsum, uses a small amount of the catalyst and can be recycled in an absorbing tower.

Description

technical field [0001] The invention relates to a process for promoting the oxidative crystallization of calcium sulfite in calcium carbide slag flue gas desulfurization, in particular to a method for promoting oxidative crystallization of calcium sulfite by using a soluble salt catalyst, which belongs to the technical field of resources and environment. Background technique [0002] Limestone-gypsum flue gas desulfurization technology is currently the most mature and effective industrial desulfurization technology, but the consumption of limestone is huge, so the search for cheaper and easier-to-obtain desulfurization absorbent has become a research hotspot. Carbide slag is the waste residue discharged from the production of acetylene, polyvinyl chloride and other products, and its main component is Ca(OH) 2 , is strongly alkaline and is a good SO 2 Absorbent, so it is used as flue gas desulfurization absorbent. Utilizing calcium carbide slag instead of limestone, on the ...

Claims

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Application Information

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IPC IPC(8): B01D53/80B01D53/50
Inventor 朱廷钰李玉然周进亭叶猛荆鹏飞
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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