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A kind of smelting slag synergistically purifies SO in tin smelting flue gas 2 method with nox

A technology for smelting flue gas and purifying tin, which is applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve problems such as ineffective purification of heavy metal content, excessive emission of flue gas indicators, complex maintenance and management, etc. The effect of low cost, high processing efficiency and simple process facilities

Active Publication Date: 2021-02-02
KUNMING METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Flue gas desulfurization and denitrification integrated technologies represented by adsorption method and high-energy electron activation oxidation method have high SO 2 and NOx removal efficiency, but there are deficiencies such as high equipment energy consumption and complicated maintenance and management, so it is difficult to be widely used in flue gas purification treatment
The traditional technological process of tin flue gas purification in the tin smelting industry is dust removal system + calcium desulfurization, and the heavy metal content in the flue gas has not been effectively purified. As a result, the desulfurization gypsum produced in the desulfurization process and the flue gas indicators after desulfurization have seriously exceeded the standard

Method used

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  • A kind of smelting slag synergistically purifies SO in tin smelting flue gas <sub>2</sub> method with nox

Examples

Experimental program
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Effect test

Embodiment 1

[0037] The tin smelting flue gas simultaneous desulfurization and denitrification purification device described in this embodiment includes an absorption tower 2 and a slag slurry circulation tank 5, the flue gas is sent from the lower part of the absorption tower 2 through the intake booster fan 1, and is atomized with the spray device 3 The sprayed slurry is in countercurrent contact, and the purified tail gas is discharged from the top of the tower; the bottom of the absorption tower 2 is connected to the circulation tank 5 through a pipeline, and the absorbed slurry is transported to the spray device 3 through the circulation pump 4; when the pH of the slurry in the circulation tank 5 is less than At 3.6 o'clock, the waste slurry is sent to the workshop through the delivery pump 9 to recover valuable metals and sulfur, and at the same time, fresh slurry is added to the circulation tank 5 . The circulation tank 5 is equipped with a stirring paddle 7 to maintain a good mixing...

Embodiment 2

[0040] Grind the slag to 150 meshes to prepare an absorption slurry with a solid content of 15%, according to sulfosalicylic acid and Fe 3+ Add sulfosalicylic acid at a molar ratio of 1:10. The liquid-gas ratio in the absorption tower is 15 L / m 3 , the superficial gas velocity is 1.2 m / s; the flue gas SO to be treated 2 The concentration is 1950~2560 mg / m 3 , NO X The concentration is 345~473 mg / m 3 , the volume fraction of oxygen is 2.3-2.5%, and the flue gas inlet temperature is 146-158°C. After running for 12h, SO 2 with NO X The removal rates were 95.0% and 58.6%, respectively, and the pH value of the circulation tank was 5.5; when the continuous operation was 60 h, the pH value of the circulation tank dropped to 3.9, and the SO 2 with NO X The removal rate of SO2 decreased to 83.3% and 45.1% respectively, and 40% of the circulating slurry in the circulation tank was discarded and an equal amount of fresh absorption liquid was added; when the continuous operation w...

Embodiment 3

[0042] Grind the slag to 200 mesh, and sieve 85%; prepare an absorption slurry with a solid content of 20%, and press sulfosalicylic acid and Fe 3+ Add sulfosalicylic acid at a molar ratio of 1:30. The liquid-gas ratio in the absorption tower is 10 L / m 3 , the superficial gas velocity is 1.5 m / s; the flue gas SO to be treated 2 The concentration is 1500~1800 mg / m 3 , NO X The concentration is 310~403 mg / m 3 , the volume fraction of oxygen is 2.4-2.7%, and the flue gas inlet temperature is 136-152°C. After running for 12h, SO 2 with NO X The removal rates were 91.0% and 52.2%, respectively, and the pH value of the circulation tank was 5.6; when the continuous operation was 60 h, the pH value of the circulation tank dropped to 3.7, and the SO 2 with NO X The removal rate of slag decreased to 81.5% and 47.2%, respectively, and 40% of the circulating slurry in the waste circulation tank was replenished with the same amount of fresh slurry; when the continuous operation was...

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Abstract

The invention discloses a smelting slag synergistically purifying SO in tin smelting flue gas 2 With the method of NOx, the desulfurization and denitrification efficiency can reach 95.0% and 58.6%; first use the slurry absorption liquid to contact and react with the flue gas countercurrently, the transition metal ions such as iron and manganese in the slurry and the SO in the flue gas 2 Catalytic oxidation reaction with NO to achieve SO 2 and simultaneous removal of NOx, SO in flue gas 2 It is absorbed and transformed into sulfuric acid, which is used as a leaching agent for valuable metals in slag, so as to realize the treatment of waste by waste; the recycled absorption slurry that is discarded regularly can be used to leach valuable metals through wet treatment technology to realize resource utilization. The method adapts to a wide range of operating conditions such as temperature and gas flow, and is also applicable to the purification treatment of other low-concentration SO2 smelting tail gases in addition to the coordinated purification treatment of tin smelting flue gas.

Description

technical field [0001] The invention belongs to the technical field of industrial waste gas purification and resource utilization, and specifically relates to a smelting slag synergistically purifying SO in tin smelting flue gas 2 approach with NOx. Background technique [0002] Sulfur dioxide is currently the main air pollutant with large emissions and obvious adverse effects on the human body. It is the chief culprit of ecological damage and environmental pollution such as plant death and acid rain formation. Therefore, SO 2 Flue gas purification treatment is imperative. The flue gas from tin smelting contains various components such as sulfur dioxide, nitrogen oxides and soot, which seriously pollute the air environment. With the strengthening of national environmental protection law enforcement and the increasingly stringent emission standards of local industries and industries, the development of a technology for synergistic desulfurization and nitrification of tin s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/86B01D53/60B01D53/80
CPCB01D53/80B01D53/8637B01D2255/2073B01D2255/20738B01D2258/0283Y02A50/20
Inventor 谢容生刘维维杨妮田林欧根能陈华君林琳
Owner KUNMING METALLURGY INST
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