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Method of sulfur recovery through sulfur dioxide flue gas cleaning and catalyzing and application of catalyst

A sulfur dioxide and catalyst technology, applied in the direction of sulfate preparation, sulfur preparation/purification, etc., can solve the problems of large consumption of NaOH, low overall economic benefits, long process flow, etc., and achieve wide concentration range, convenient transportation, and economic value high effect

Active Publication Date: 2013-02-06
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent ZL 03158257.5 reports a method for preparing ammonium sulfate by absorbing sulfur dioxide by ammonia method, but there is a problem that ammonia is easily volatilized in the ammonia method absorption process, which makes the overall economic benefit of the process low
Chinese patent ZL 200410056898.0 reports a method for preparing anhydrous sodium sulfite by absorbing sulfur dioxide in caustic soda. This method has a long process flow, large consumption of NaOH and high cost
In addition, Chinese patent ZL200710035059.4 proposes a method of absorbing SO by using sodium sulfide 2 The method for preparing sulfur has a long process flow, requires high temperature and high pressure equipment, high cost, and H 2 S produced, causing environmental pollution

Method used

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  • Method of sulfur recovery through sulfur dioxide flue gas cleaning and catalyzing and application of catalyst

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Experimental program
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Effect test

Embodiment 1

[0045] Chemically pure sodium hydroxide, its main components are: NaOH>99.0%. Water is first-grade deionized water; simulated flue gas is SO 2 Fully mixed gas with air, the volume ratio is 3%, 97% in turn; chemically pure sulfuric acid, its main component is: sulfuric acid (H 2 SO 4 ) mass fraction ≥ 98%.

[0046]The sodium hydroxide of above-mentioned composition, is mixed with 200ml solution, and sodium hydroxide concentration is 3.0mol / L. Add the prepared sodium hydroxide solution to two bubbling absorption devices respectively, each level of solution is 100ml. Connect the two-stage absorption system. The above-mentioned sulfur dioxide-containing flue gas passes through two bubbling absorption devices at a flow rate of 0.4L / min at 25°C. A pH meter is installed on the first-stage bubbling absorption tower to measure the absorption liquid online. The pH value of the tail gas is used to analyze SO by flue gas analyzer 2 concentration. The above-mentioned flue gas is abso...

Embodiment 2

[0049] Chemically pure sodium carbonate, its main components are: Na 2 CO 3 >99.0%. Water is first-grade deionized water; simulated flue gas is SO 2 Fully mixed gas with air, the volume ratio is 3%, 97% in turn; chemically pure sulfuric acid, its main component is: sulfuric acid (H 2 SO 4 ) mass fraction ≥ 98%.

[0050] The sodium carbonate of above-mentioned composition, is mixed with 200ml solution, and sodium carbonate concentration is 0.1mol / L. Add the prepared sodium hydroxide solution to two bubbling absorption devices respectively, each level of solution is 100ml. Connect the two-stage absorption system. The above-mentioned sulfur dioxide-containing flue gas passes through two bubbling absorption devices at a flow rate of 0.4L / min at 25°C. A pH meter is installed on the first-stage bubbling absorption tower to measure the absorption liquid online. The pH value of the tail gas is used to analyze SO by flue gas analyzer 2 concentration. The above flue gas is absor...

Embodiment 3

[0053] Industrial caustic soda Class I superior product (GB209-2006), its main component is: NaOH>99.0%. Water is industrial water; contains SO 2 The flue gas is the smelting flue gas of the rotary kiln with zinc leaching slag, and its main component is SO 2 2980mg / m 3 , CO 17%, CO 2 30%, N 2 53%; first-class product of industrial sulfuric acid (GB 534-2002), its main component is: sulfuric acid (H 2 SO 4 ) mass fraction ≥ 92.5% or 98%.

[0054] The industrial caustic soda of above-mentioned composition, is mixed with 300.0L solution, filters out insoluble matter, and sodium hydroxide concentration is 1.0mol / L. Add the prepared sodium hydroxide solution to the two-stage bubbling absorption tower through the lye supply system, the first-stage absorption bubbling tower is 200L, and the second-stage absorption bubbling tower is 100L. After the above-mentioned flue gas is cooled to 30°C and the heavy metal dust is removed, the gas is evenly distributed through the gas dis...

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Abstract

The invention discloses a method of sulfur recovery through sulfur dioxide flue gas cleaning and catalyzing and the application of a catalyst. The technical steps are shown as the following figure, and the method concretely comprises the following steps: absorbing sulfur dioxide flue gas through alkali liquor, adding elementary selenium powder catalyst into obtained absorption liquid containing hydrosulphite, adding the elementary selenium powder catalyst and the absorption liquid into a closed container to be conducted to catalyzing, so as to produce elementary sulfur precipitate, adding sulphuric acid into the liquid after the sulfur precipitate is filtered and separated, concentrating and crystallizing, and obtaining hydrosulfate crystal after filtering. The method overcomes the deficiency of low concentration sulfur dioxide flue gas treatment in the prior art, adopts the elementary selenium as the catalyst, provides an efficiently absorbed sulfur recovery, adopts the mode of recovering elementary sulfur through two-stage low temperature sulfur-containing absorption liquid catalyzing and converting, is simple and environmentally friendly and high in economic benefit, and belongs to the field of resource and environment protection.

Description

technical field [0001] The invention relates to a method for producing sulfur and bisulfate by purifying and recovering sulfur resources in low-concentration sulfur dioxide flue gas at low temperature. It belongs to the field of resource and environment protection. Background technique [0002] Low-concentration sulfur dioxide comes from steel, electric power, non-ferrous metals, petrochemicals, chemicals, building materials and other industries. It has the characteristics of wide distribution, low concentration, and difficult treatment. It is easy to form acid rain and secondary particle pollutants, which seriously endangers the ecological environment. The concentration of sulfur dioxide contained in low-concentration sulfur dioxide flue gas cannot meet the requirements of conventional sulfuric acid production processes, so terminal treatment methods are often used for treatment. At present, the treatment methods of low-concentration sulfur dioxide in flue gas mainly inclu...

Claims

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Application Information

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IPC IPC(8): C01B17/04C01B17/96
Inventor 柴立元刘恢杨本涛彭兵闵小波杨志辉
Owner CENT SOUTH UNIV
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