Method for synergistically purifying SO2 and NOx in tin smelting flue gas by smelting furnace slag

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: 2018-11-30
KUNMING METALLURGY INST
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  • Description
  • Claims
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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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  • Method for synergistically purifying SO2 and NOx in tin smelting flue gas by smelting furnace slag

Examples

Experimental program
Comparison scheme
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 present invention discloses a method for synergistically purifying SO2 and NOx in tin smelting flue gas by smelting furnace slag. Desulfurization efficiency can reach 95.0% and denitration efficiency can reach 58.6%. In the method, firstly, slag slurry absorbing liquid is used to conduct countercurrent contact reaction with flue gas; transition metal ions of iron, manganese, etc. in slag slurry conduct catalytic oxidation reaction with SO2 and NO in the flue gas to realize simultaneous removal of the SO2 and NOx; the SO2 in the flue gas is absorbed and converted into sulfuric acid which isused as a valuable metal leaching agent in furnace slag, so that treatment of wastes with processes of wastes against one another is realized; the periodically discarded circulating absorption slurrycan leach valuable metals by a wet processing technology to realize resource utilization. The method is suitable for operating conditions of relatively wide temperature and gas flow rate ranges, etc.The method is also suitable for purification treatment of other low-SO2-concentration smelting tail gas in addition to the synergistic purification treatment of the 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 Applications(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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