Dry-type removing method for sulfur trioxide and heavy metals in nonferrous smelting acid-making flue gas

A sulfur trioxide and smelting flue gas technology, which is applied in the field of flue gas purification, can solve the problems of unsuitable sulfur trioxide removal and poor sulfur trioxide removal effect, so as to reduce sulfuric acid concentration and heavy metal content, reduce generation, and reduce generation effect

Active Publication Date: 2015-08-19
SHANGHAI JIAO TONG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

The above-mentioned patent adopts the method of electric field adsorption to remove fine particles and heavy metals, but

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  • Dry-type removing method for sulfur trioxide and heavy metals in nonferrous smelting acid-making flue gas

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Embodiment 1

[0029] A method for dry removal of sulfur trioxide and heavy metals from flue gas from acid smelting in non-ferrous metallurgy, using such as figure 1 The shown process specifically comprises the following steps:

[0030] In the first step, after the non-ferrous metal smelting flue gas passes through the high-temperature waste heat boiler to initially recover heat, it first passes through the first-stage dust removal device for first-stage dust removal to remove more than 90% of the smoke in the flue gas;

[0031] Flue gas from non-ferrous metal smelting contains sulfur dioxide, sulfur trioxide and heavy metals, among which heavy metals are one or more of lead, mercury, arsenic, cadmium and chromium.

[0032] The first-stage dust removal device is one of electric dust collectors or high-efficiency multi-tube dust collectors; the dust collected by the first-stage dust removal device is returned to the smelting furnace or directly recycled.

[0033] The second step, using compr...

Embodiment 2

[0043] Taking simulated non-ferrous metal smelting flue gas as the treatment object, the SO in the flue gas was depleted by dry adsorption. 3 The adsorption removal experiment was carried out, the simulated flue gas volume was 1L / h, and the flue gas temperature was 200 degrees. The specific processing steps are as follows:

[0044] 1. Weigh 50 mg of calcium oxide adsorbent, place it in a fixed bed reactor, and control the temperature of the reactor within the range of 200±10 degrees through a tube furnace;

[0045] 2. Pass the simulated flue gas into the fixed bed reactor, and then pass the SO in the flue gas through the mass flow meter 3 , SO 2 The concentrations are controlled at 3000mg / m 3 and about 2%, using the flue gas sampling system to measure the SO at the inlet and outlet of the fixed bed reactor 3 , SO 2 The concentration was sampled and analyzed, and the results showed that SO 3 The removal efficiency is above 95%, while SO 2 The removal efficiency is about ...

Embodiment 3

[0048] Taking the actual flue gas of a lead smelting plant as the processing object, it leads 100m from the flue 3 / h of actual flue gas, where SO 3 The concentration is 3400-3600mg / m 3 , SO 2 The concentration of Hg is about 9-10%, and the concentration of Hg is 4-5mg / m 3 , the temperature of the flue gas is about 250 degrees, the flue gas is drawn out through a multi-tube dust collector, the temperature of the flue gas is reduced to about 150 degrees, and then the zinc oxide dry powder with a particle size of 300 meshes is sprayed into the flue gas, and the adsorbent is injected The volume is 500g / h, and the treated flue gas is finally returned to the main flue through a small bag filter. After the reaction was stable, the flue gas at the outlet of the bag filter was sampled and analyzed, and the results showed that SO 3 The removal efficiency of SO is over 90% 2 The removal efficiency of mercury is about 16%, while the removal rate of mercury has reached more than 85%....

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Abstract

The invention relates to a dry-type removing method for sulfur trioxide and heavy metals in nonferrous smelting acid-making flue gas. The method comprises the following steps: primarily recovering heat of nonferrous smelting flue gas through a high-temperature heat recovery boiler and carrying out first-stage dust removal through a first-stage dust removal device so as to remove more than 90% of gas dust in the flue gas; then directly jetting, from a flue, the powder of an absorbent capable of adsorbing/absorbing SO3 and heavy-metal components into the flue gas having undergone the first-stage dust removal, and carrying out absorption reaction; then cooling the flue gas containing the absorbent by utilizing a flue gas heat-exchange device so as to allow SO3 and heavy metals to be effectively trapped and collected by the absorbent and part of volatile heavy metals to be condensed through induction; and finally, trapping and collecting the absorbent having absorbed SO3 and the heavy metals and granular heavy metals via a second-stage dust removal device. Compared with the prior art, the dry-type removing method provided by the invention can effectively remove the heavy metal components and SO3 in the flue gas from upstream and reduces the concentration of sulfuric acid and the contents of heavy metals in washing wastewater.

Description

technical field [0001] The invention relates to a method for purifying flue gas, in particular to a method for dry-type removal of sulfur trioxide and heavy metals from the flue gas of nonferrous smelting acid production. Background technique [0002] At present, most non-ferrous metal smelting processes in my country are based on pyrometallurgical processes. Non-ferrous metal ores mostly exist in the form of sulfides, and a large amount of smelting flue gas containing high concentrations of sulfur oxides and heavy metals will be produced during the smelting process. Since wet washing is often used as an important process for cooling and dust removal in the non-ferrous metal smelting flue gas purification process, a large amount of washing wastewater is generated. Due to the SO in the flue gas of non-ferrous metal smelting 3 It is easily soluble in washing liquid, so the pH value of washing wastewater is low, also known as washing sewage acid. In addition, part of the heav...

Claims

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Application Information

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IPC IPC(8): B01D53/83B01D53/82B01D53/50B01D53/64B01D50/00
Inventor 晏乃强瞿赞马永鹏刘庆航祝政轩
Owner SHANGHAI JIAO TONG UNIV
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