Method for flue gas desulfurization and byproduct polymeric ferric sulfate production by using steel pickling waste liquor
A technology of iron and steel pickling waste liquid and polymeric ferric sulfate, which is applied in the direction of ferric sulfate, microbial-based methods, separation methods, etc., can solve the problems of low quality and basicity of polymeric ferric sulfate, large amount of catalyst, and long oxidation time , to achieve the effect of low cost, increased added value and simple process
Active Publication Date: 2013-02-06
CHINA PETROLEUM & CHEM CORP +1
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Problems solved by technology
The disadvantage is that the oxidation time is long, the amount of catalyst is large, the quality and basicity of the product polyferric sulfate are low, and secondary pollution occurs
Above-mentioned method adopts ferrous sulfate as raw material, adds sulfuric acid to adjust pH value, and production cost is higher
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[0026] Hanging film of biological packed tower
[0027] Rejuvenation of Thiobacillus ferrooxidans. Thiobacillus ferrooxidans was inoculated with 9k culture medium at an optimal inoculum size of 10% to 30%, adjusted to a pH of 2.0 to 2.5, and cultured in a constant temperature shaking box at a temperature of 20 to 30°C. Repeated inoculation and culture until Thiobacillus ferrooxidans reached the best activity state.
[0028]The packing tower hangs the film. Add the above cultured Thiobacillus ferrooxidans into the activated sludge from the secondary sedimentation tank, and after 7-15 days of cultivation and domestication, observe the microbial state with a microscope. A large number of bellworms, branchworms, and a small amount of worms appeared in the sludge. For rotifers, add the amount of sludge concentration of 0.5~5g / L into the biological packing tower. After standing still for 8 hours, ventilate and aerate for 12~36 hours, and start to feed water continuously. The amoun...
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Abstract
The present invention discloses a method for flue gas desulfurization and a byproduct polymeric ferric sulfate production by using steel pickling waste liquor, including the following processes: the steel pickling waste liquor is used as an absorber for flue gas desulfurization, wherein a absorbing tower is filled with filler materials, the filler materials are hang with biofilm by culturing Thiobacillus ferrooxidans; steel pickling waste liquor is sprayed into the tower packed with biological filler from the upper part of the absorbing tower, wherein Fe2+ in the steel pickling waste liquor are turned into Fe3 + under the oxidation effect of the Thiobacillus ferrooxidans in the biofilm; when the flue gas containing sulfur dioxide passes through the biofiller packed tower, the sulfur dioxide was absorbed and dissolved in the steel pickling waste liquor, and sulfurous acid is formed; sulfurous acid is converted into sulfuric acid in the catalytic oxidation effect of the Fe3 +; and liquid polymeric ferric sulfate is prepared through hydrolysis and polymerization reactions of the products obtained from the above reactions. According to the method of the present invention, polymeric ferric sulfate is obtained in the process of desulfurization, the purposes of controlling waste by waste, and turning waste into treasure is realized. The method is safe and reliable, and has the advantages of simple operation, and energy saving and environmental protection, having huge economic and environmental benefits.
Description
technical field [0001] The invention relates to a waste gas comprehensive utilization treatment technology, in particular to a method for desulfurizing flue gas of steel pickling waste liquid by biochemical method and producing polymeric ferric sulfate as a by-product. Background technique [0002] In recent years, my country's annual sulfur dioxide emissions have exceeded 20 million tons, and my country has become the third largest acid rain area after Europe and North America. Controlling sulfur dioxide emissions and adopting advanced flue gas desulfurization technology is an urgent task to protect the atmospheric environment. [0003] At present, the purification technology for removing sulfide in industrial production is divided into two desulfurization systems: wet process and dry process. Among them, the limestone-gypsum wet desulfurization process is the most mature and widely used desulfurization process in the world, and can produce gypsum by-product. However, acc...
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IPC IPC(8): B01D53/84B01D53/50C01G49/14C12P3/00C12R1/01
CPCY02A50/20
Inventor 刘玲郭兵兵许谦
Owner CHINA PETROLEUM & CHEM CORP
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