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Method for preparing sulfuric acid from desulfurized gypsum in secondary lead smelting process as raw material

A technology for regenerated lead smelting and desulfurization gypsum, applied in chemical instruments and methods, sulfur compounds, inorganic chemistry, etc., can solve the problems of unstable operation, poor economic benefits, and high investment costs, and improve absorption efficiency, save energy, and save energy. Effects of Sulfur Resources

Inactive Publication Date: 2013-03-20
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, it has the disadvantages of large heat consumption, large power consumption, high investment, and poor economic benefits. Although there have been many improved devices and processes since then, problems such as unstable operation, high investment costs, and easy to cause secondary pollution have not been effectively solved. the solution

Method used

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  • Method for preparing sulfuric acid from desulfurized gypsum in secondary lead smelting process as raw material
  • Method for preparing sulfuric acid from desulfurized gypsum in secondary lead smelting process as raw material

Examples

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Effect test

Embodiment 1

[0044] Take 400kg of desulfurized gypsum residue after being dehydrated by a vacuum belt dehydrator and dried by a quick dryer, and add 80kg of coal powder and 5kg of additive Fe 2 o 3 . After crushing and grinding, it becomes a uniform mixture, and the particle size of the mixture is controlled at 1-3mm. After preheating, it is calcined at 950°C for 15 minutes, and the obtained by-products (mainly calcium oxide) are directly returned to the desulfurization tower pulping tank for pulping. And the product SO at a temperature of 500-700°C 2 After the flue gas dedusting and oxygen enrichment reaction, heat exchange treatment is carried out, which is used for drying of desulfurization gypsum waste residue. After heat exchange, the mixed gas (mainly containing SO 2 , SO 3 , O 2 ) temperature drops to 150~200℃, in the presence of catalyst V 2 o 5 Under the condition of existence, the oxygen-enriched oxidation is performed on the low-temperature mixed gas again, and after the...

Embodiment 2

[0046] Take 400kg of desulfurized gypsum residue after being dehydrated by a vacuum belt dehydrator and dried by a quick dryer, and add 40kg of coal powder and 4kg of additive Fe 3 o 4 . After crushing and grinding, it becomes a uniform mixture, and the particle size of the mixture is controlled at 1-3mm. After preheating, it is calcined at 800°C for 10 minutes, and the obtained by-products (mainly calcium oxide) are directly returned to the desulfurization tower for pulping. And the product SO at a temperature of 500-700°C 2 After the flue gas dedusting and oxygen enrichment reaction, heat exchange treatment is carried out, which is used for drying of desulfurization gypsum waste residue. After heat exchange, the mixed gas (mainly containing SO 2 , SO 3 , O 2 ) temperature drops to 150~200℃, in the presence of catalyst V 2 o 5 Under the condition of existence, the oxygen-enriched oxidation of the low-temperature mixed gas is carried out again, and after the high-low t...

Embodiment 3

[0048] Take 400kg of desulfurized gypsum residue after being dehydrated by a vacuum belt dehydrator and dried by a quick dryer, and add 100kg of coal powder and 10kg of additive Fe 2 o 3 and 10kg additive Fe 3 o 4 . After crushing and grinding, it becomes a uniform mixture, and the particle size of the mixture is controlled at 3-5mm. After preheating, it is calcined at 850°C for 6 minutes, and the obtained by-products (mainly calcium oxide) are directly returned to the desulfurization tower for pulping. And the product SO at a temperature of 500-700°C 2 After the flue gas dedusting and oxygen enrichment reaction, heat exchange treatment is carried out, which is used for drying of desulfurization gypsum waste residue. After heat exchange, the mixed gas (mainly containing SO 2 , SO 3 , O 2 ) temperature drops to 150~200℃, in the presence of catalyst V 2 o 5 Under the condition of existence, the oxygen-enriched oxidation of the low-temperature mixed gas is carried out a...

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Abstract

The invention discloses a method for preparing sulfuric acid from desulfurized gypsum in a secondary lead smelting process as a raw material. The method comprises the following steps of: (a) taking desulfurized gypsum waste residue in the secondary lead smelting process, dewatering and then baking the desulfurized gypsum waste residue; (b) adding pulverized coal and an additive to the baked desulfurized gypsum, crushing and grinding to form an even mixture, burning and decomposing the desulfurized gypsum after pre-heating, carrying out high-temperature oxidation reaction on product high-temperature SO2 smoke after dust removal and oxygen enrichment, and carrying out heat exchange on the mixed gas to dry the desulfurized gypsum waste residue; (c) reducing the temperature of the heat-exchanged mixed gas, carrying out oxygen-enriched oxidation on the mixed gas again under the condition that a catalyst V2O5 exists; and (e) absorbing the obtained SO3 gas by concentrated sulfuric acid. The sulfuric acid is prepared from the desulfurized gypsum waste residue in the secondary lead smelting process; and the problem of difficulty in processing the desulfurized gypsum is solved, and rubbish is reused, and meanwhile, domestic sulfur resources are saved.

Description

technical field [0001] The invention relates to a method for producing sulfuric acid by using desulfurized gypsum waste residue in the secondary lead smelting process, and belongs to the field of comprehensive utilization of industrial by-product gypsum waste residue resources and environmental protection and management. Background technique [0002] At present, my country's annual industrial desulfurization gypsum emissions have exceeded 70 million tons, and with the country's efforts to control flue gas desulfurization in recent years, the emissions of desulfurization gypsum will rise rapidly. Due to the high fineness of industrial by-product gypsum, high water content and harmful substances, which affect its availability, random discharge will cause serious environmental pollution, while landfills occupy a lot of land and require a large investment. Long-term accumulation will damage the surrounding environment and Water quality is polluted. [0003] The traditional meth...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/775C01B17/50
Inventor 舒月红朱龙冠陈红雨
Owner SOUTH CHINA NORMAL UNIVERSITY
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