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Catalytic oxidation technique for calcium sulfite

A technology for catalytic oxidation and calcium sulfite, applied in chemical instruments and methods, separation methods, separation of dispersed particles, etc., can solve problems such as unsuitable limestone-gypsum technology, achieve significant catalytic oxidation of calcium sulfite, reduce system The possibility of fouling, the effect of facilitating desulfurization operation

Inactive Publication Date: 2008-08-20
CPI YUANDA ENVIRONMENTAL PROTECTION ENG +1
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Problems solved by technology

But this process can only be used for Ca(OH)2 / Mg(OH)2 desulfurization process, not suitable for limestone-gypsum process

Method used

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  • Catalytic oxidation technique for calcium sulfite

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Experimental program
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Effect test

Embodiment 1

[0017] Add FeSO4 solution with a concentration of 0.05mol / L in the calcium sulfite slurry, keep the pH value at about 5-6, and carry out forced oxidation on the slurry. The curve of the oxidation rate over time is shown in Figure 1. It is found that when the concentration of FeSO4 catalyst is 0.05mol / L, the oxidation of calcium sulfite is 91.2%, while the oxidation process without catalyst is only 63.4%. In addition, it can also be seen from Figure 2 that when the catalyst is added, the pH value can be kept in a relatively stable state, and the oxidation rate is also in a relatively high range.

Embodiment 2

[0019] Add a MnSO4 solution with a concentration of 0.05mol / L to the calcium sulfite slurry, keep the pH value at about 5-6, carry out forced oxidation on the slurry, and make the relationship diagram of oxidation rate and time. It can also be seen that when MnSO4 is added After the catalyst, the oxidation rate of calcium sulfite is only 63.4%. In addition, it can also be seen from the relationship diagram of pH value, oxidation rate and time in the catalytic oxidation process that when the catalyst is added, the pH value can be kept in a relatively stable state, and the oxidation rate is also in a relatively high range.

Embodiment 3

[0021] Add MnSO4 and FeSO4 solutions with a concentration of 0.05mol / L to the calcium sulfite slurry. There is no special requirement for the ratio between the two, but the pH value of the slurry should be kept at about 5-6 after adding. It can also be seen from the graph of the relationship between the oxidation rate and time that when the MnSO4 catalyst is added, the oxidation rate of calcium sulfite increases significantly, the pH value can be kept in a relatively stable state, and the oxidation rate is also in a relatively high range.

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Abstract

The invention relates to a calcium sulfate catalytic oxidation process in limestone-gypsum wet flue gas desulfurization, which adopts the technical proposal that soluble ferrous salt and manganic salt or the mixture of the soluble ferrous salt and magnetic salt is used as catalyst and added in the slurry with absorbed SO2; the concentration of the soluble ferrous salt and manganic salt is 0.001 to 0.05mol / L; the pH value of the slurry with the added catalyst is 5 to 6. The calcium sulfate catalytic oxidation process has the advantages of greatly increasing the oxidation rate of the calcium sulfate, stabilizing the pH value of the system, facilitating the desulfurization operation with cheap and recyclable catalyst in the absorption tower, increasing the absorption rate of the SO2 due to the increased the oxidation rate of the calcium sulfate and reducing the scale possibility of the system.

Description

technical field [0001] The invention relates to the oxidation technology of calcium sulfite in flue gas desulfurization, in particular to the catalytic oxidation technology of calcium sulfite in limestone-gypsum wet flue gas desulfurization. Background technique [0002] With the rapid and sustained economic development, the atmosphere is 2 The situation of serious pollution is becoming more and more obvious. Flue gas desulfurization (FGD) of coal-fired boilers is currently the only 2 In this technology, limestone-gypsum wet flue gas desulfurization plays a dominant role. In the limestone-gypsum wet flue gas desulfurization process, the oxidation of calcium sulfite is an important chemical process, and its oxidation efficiency is directly related to the removal rate of SO2 and the quality of the by-product gypsum. The oxidation efficiency of calcium sulfate is of great significance to the limestone-gypsum wet flue gas desulfurization process. The Chinese patent applicati...

Claims

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Application Information

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IPC IPC(8): B01D53/50B01D53/80
Inventor 杨剑杜云贵刘清才刘艺董凌燕隋建才李锋文娟洪燕王强王方群陈勇
Owner CPI YUANDA ENVIRONMENTAL PROTECTION ENG
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