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Flue gas desulfurization method using secondary zinc oxide soot as desulfurizing agent

A technology of secondary zinc oxide and desulfurizer, applied in chemical instruments and methods, separation methods, zinc sulfate, etc., can solve the problems of lengthy process, high grade and impurity requirements of secondary zinc oxide, and reduce equipment blockage and scaling, economical Significant environmental protection benefits, significant technological advancement and promotional effects

Inactive Publication Date: 2019-12-13
广东金宇环境科技股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current technology is only used in lead-zinc smelting enterprises, and has high requirements on the grade and impurities of sub-zinc oxide. The conversion process of zinc sulfite is lengthy, and the subsequent treatment needs to oxidize and dissolve zinc sulfite, which has certain limitations in terms of process technology and equipment.

Method used

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  • Flue gas desulfurization method using secondary zinc oxide soot as desulfurizing agent

Examples

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Effect test

Embodiment 1

[0034] Using the hazardous waste treatment metallurgical furnace flue gas desulfurization of an environmental protection enterprise, the flue gas volume to be treated is 60000m 3 / h, flue gas SO 2 Concentration 3500mg / m 3 , The secondary zinc oxide soot composition used is: zinc 26.8%, tin 2.56%, lead 0.74%, copper 1.25%, nickel 0.98%.

[0035] The above-mentioned secondary zinc oxide soot is carried out according to the following process steps:

[0036] 1. Pulping, mixing sub-zinc oxide soot with clean water or subsequent process return liquid to make slurry, controlling the liquid-solid ratio to 6:1, stirring at room temperature for 30 minutes, and sending the overflowed slurry to the oxygen-enriched conversion-foam desulfurization process;

[0037] 2. Oxygen-enriched conversion-foam desulfurization, mix the overflow slurry in the previous stage of the process with 1% foaming agent in the transfer tank, and after stirring, inject it into the liquid storage pool at the bott...

Embodiment 2

[0040] Using the hazardous waste treatment metallurgical furnace flue gas desulfurization of an environmental protection enterprise, the flue gas volume to be treated is 60000m 3 / h, flue gas SO 2 Concentration 3500mg / m 3 , The subzinc oxide soot composition used is: zinc 61.36%, tin 0.09%, lead 2.74%, copper 0.25%, nickel 0.08%.

[0041] The above-mentioned secondary zinc oxide soot is carried out according to the following process steps:

[0042] 1. Pulping, mixing secondary zinc oxide soot with clean water or subsequent process return liquid to make slurry, controlling the liquid-solid ratio to 10:1, stirring at room temperature for 30 minutes, and sending the overflowed slurry to the oxygen-enriched conversion-foam desulfurization process;

[0043] 2. Oxygen-enriched conversion-foam desulfurization, mix the overflow slurry in the previous stage of the process with 3% foaming agent in the transfer tank, and after stirring, inject it into the liquid storage pool at the bot...

Embodiment 3

[0046] Using the hazardous waste treatment metallurgical furnace flue gas desulfurization of an environmental protection enterprise, the flue gas volume to be treated is 60000m 3 / h, flue gas SO 2 Concentration 3500mg / m 3 , The subzinc oxide soot composition used is: zinc 39.12%, tin 0.08%, lead 5.04%, copper 3.25%, nickel 1.28%.

[0047] The above-mentioned secondary zinc oxide soot is carried out according to the following process steps:

[0048] 1. Pulping, mixing sub-zinc oxide soot with clean water or subsequent process return liquid to make slurry, controlling the liquid-solid ratio to 8:1, stirring at room temperature for 30 minutes, and sending the slurry to the oxygen-enriched conversion-foam desulfurization process after overflow;

[0049] 2. Oxygen-enriched conversion-foam desulfurization, mix the overflow slurry in the previous stage of the process with 3% foaming agent in the transfer tank, and after stirring, inject it into the liquid storage pool at the bottom...

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Abstract

The invention discloses a flue gas desulfurization method using secondary zinc oxide soot as a desulfurizing agent. The method comprises a pulping process, an oxygen-enriched foaming process, a foam desulfurization process, a post-desulfurization slurry filtering process, a purification and impurity removal process and a concentration and crystallization process. According to the method disclosedby the invention, insoluble zinc sulfite generated in the desulfurization process of secondary zinc oxide soot is converted into zinc sulfate in time, a reaction is promoted to be carried out towardsa direction beneficial to SO2 absorption, and the redundant process of subsequent oxidative desulfurization of by-products is omitted; equipment blockage and scaling are reduced in a foam absorption mode; meanwhile, efficient desulfurization of the flue gas of a metallurgical kiln for production of zinc sulfate products is achieved, environmental protection treatment input is changed into environmental protection benefit output, and multiple purposes are achieved; and the method has a positive promoting effect on national atmospheric pollution prevention and control, and produces remarkable economic and environmental protection benefits.

Description

technical field [0001] The invention relates to the technical field of industrial sulfur-containing tail gas treatment, in particular to a flue gas desulfurization method using sub-zinc oxide soot as a desulfurizing agent. Background technique [0002] In the prior art, flue gas desulfurization refers to the removal of sulfur oxides from flue gas or other industrial waste gases produced by industrial furnaces, referred to as FGD technology, and its essence is to use alkaline substances to absorb acidic sulfur oxides in flue gas process. The most commonly used types of alkaline substances are lime and sodium alkali. Absorption methods include dry, wet, semi-wet, etc. Among them, wet desulfurization methods are widely used, mainly including lime (stone)-gypsum method, sodium-alkali method, double-alkali method, ammonia absorption method, etc. The main reason for using these methods is The technology is mature, the equipment requirements are not high, the process is simple, t...

Claims

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Application Information

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IPC IPC(8): B01D53/50B01D53/80B01D53/96C01G9/06
CPCB01D53/50B01D53/80B01D53/96B01D2258/0283C01G9/06
Inventor 薛文涛范泽圣周济杨庆先邹嘉珍
Owner 广东金宇环境科技股份有限公司
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