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Method for dry desulfurization and demercuration of sintering flue gas containing mercury by means of low-grade pyrolusite

A technology for sintering flue gas and dry desulfurization, applied in separation methods, chemical instruments and methods, gas treatment, etc., can solve the problems of complex gas-liquid-solid three-phase reaction, reducing mercury adsorption efficiency, and difficult to control desulfurization rate. The effect of promoting adsorption effect, increasing porosity, and improving the efficiency of desulfurization

Inactive Publication Date: 2016-06-22
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main manifestations are the following situations. The gas-liquid-solid three-phase reaction is very complicated, and the desulfurization rate is difficult to control. The impurities in the low-grade pyrolusite pulp will react with the intermediate products, which is not conducive to desulfurization. 2 o 6 ) decomposition will produce SO 2 At the same time, the dust particles in the sintering flue gas can easily block the gaps on the surface of low-grade pyrolusite, reducing the adsorption efficiency of mercury
So far, there are few public reports on low-grade pyrolusite dry-process flue gas desulfurization and mercury removal at home and abroad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] A method for dry desulfurization of low-grade pyrolusite sintering flue gas, comprising the steps of:

[0050] (1) get low-grade pyrolusite;

[0051] (2) putting the low-grade pyrolusite in the step (1) into the fixed-bed desulfurization reactor;

[0052] (3) Pass the sintering flue gas at a temperature of 110-130°C into the electrostatic precipitator for dust removal, and then pass it into the fixed bed desulfurization reactor at a flow rate of 3-4L / min to make the sintering flue gas and low-grade pyrolusite powder contact, where the SO 2 React with low-grade pyrolusite to complete desulfurization;

[0053] (4) The desulfurized sintering flue gas is directly discharged from the exhaust port of the desulfurization reactor.

Embodiment 2

[0055] A method for dry desulfurization of low-grade pyrolusite sintering flue gas, comprising the steps of:

[0056] (1) Get low-grade pyrolusite and grind it to 140-160 mesh to obtain low-grade pyrolusite powder;

[0057] (2) the low-grade pyrolusite powder obtained in the step (1) is put into a fixed-bed desulfurization reactor;

[0058] (3) Pass the sintering flue gas at a temperature of 100-110°C into the electrostatic precipitator for dust removal, and then pass it into the fixed bed desulfurization reactor at a flow rate of 1-2L / min to make the sintering flue gas and low-grade pyrolusite powder contact, where the SO 2 React with low-grade pyrolusite to complete desulfurization, SO 2 The solid product obtained after reacting with low-grade pyrolusite is soaked in normal temperature water to obtain manganese sulfate;

[0059] (4) The desulfurized sintering flue gas is directly discharged from the exhaust port of the desulfurization reactor.

Embodiment 3

[0061] A method for dry desulfurization of low-grade pyrolusite sintering flue gas, comprising the steps of:

[0062] (1) Get low-grade pyrolusite and grind it to 60-100 mesh to obtain low-grade pyrolusite powder;

[0063] (2) the low-grade pyrolusite powder obtained in the step (1) is put into a fluidized bed desulfurization reactor;

[0064] (3) Pass the sintering flue gas at a temperature of 130-140°C into the bag filter for dust removal, and then pass it into the fluidized bed desulfurization reactor at a flow rate of 2-3L / min, so that the sintering flue gas and low-grade pyrolusite powder contact, where the SO 2 React with low-grade pyrolusite to complete desulfurization, SO 2 The solid product obtained after reacting with low-grade pyrolusite is soaked in normal temperature water to obtain manganese sulfate;

[0065] (4) The desulfurized sintering flue gas is directly discharged from the exhaust port of the desulfurization reactor.

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Abstract

The invention discloses a method for dry desulfurization and demercuration of sintering flue gas containing mercury by means of low-grade pyrolusite. The method comprises the steps that 1, the low-grade pyrolusite is obtained and placed in a reactor; 2, dedusting is conducted on the sintering flue gas to remove dust containing sulfur and mercury in the sintering flue gas, then the dedusted sintering flue gas with the temperature of 100-200 DEG C is introduced into the reactor at the flow rate of 1-8 L / min to enable the sintering flue gas to make contact with the low-grade pyrolusite, SO2 in the sintering flue gas reacts with the low-grade pyrolusite to achieve desulfurization, and residual mercury in the sintering flue gas is adsorbed by pyrolusite to achieve demercuration; 3, the sintering flue gas subjected to desulfurization and demercuration is directly discharged through an exhaust port of the reactor. The method has the advantages that desulfurization and demercuration cost is low, desulfurization and demercuration efficiency is high, the process is simple, and the recovery rate of byproducts is high.

Description

technical field [0001] The invention relates to a method for dry desulfurization and demercuration of sintering flue gas, in particular to a method for dry desulfurization and demercuration of mercury-containing sintering flue gas by using low-grade pyrolusite. Background technique [0002] Currently my country's SO 2 The discharge volume has ranked first in the world, and my country has become the third largest acid rain area in the world, with hundreds of billions of dollars lost every year due to acid rain, and the SO in sintering flue gas 2 It is one of the main sources of acid rain. At the same time, some mercury-containing sintering flue gas has caused serious pollution to the atmosphere. However, at present, wet flue gas desulfurization is still the main method at home and abroad, and the wet method accounts for about 85%. Limestone-gypsum method and sodium-alkali method are commonly used, but the investment and operation costs of this method are high, the system is...

Claims

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Application Information

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IPC IPC(8): B01D53/81B01D53/50
CPCB01D53/02B01D53/508B01D53/81B01D2253/10B01D2257/302B01D2257/602B01D2258/0283B01D2259/128
Inventor 吴复忠
Owner GUIZHOU UNIV
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