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A method for producing analytically pure sulfuric acid from smelting flue gas

A sulfuric acid and flue gas technology, applied in sulfur trioxide/sulfuric acid, chemical instruments and methods, sulfur compounds, etc., can solve the problems of unfavorable equipment operation and management, restricting production costs, high energy consumption, reducing environmental protection costs, Increase product revenue, obvious effect of economic benefits

Active Publication Date: 2018-07-17
河池市生富冶炼有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The biggest disadvantage of the distillation method is the high energy consumption. According to statistics, the production of 1 ton of analytically pure sulfuric acid consumes at least 550kWh of electricity
In addition, there are other factors that also restrict the reduction of production costs
For example, the processing capacity of a single device is small, and the production capacity can only be increased by parallel production of multiple devices, which is not conducive to the operation and management of the equipment; Severe corrosion and increased production costs

Method used

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  • A method for producing analytically pure sulfuric acid from smelting flue gas

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Effect test

Embodiment 1

[0027] Such as figure 1 , a method for producing analytically pure sulfuric acid from smelting flue gas, comprising the steps of:

[0028] (1) Deep purification: from the flue gas inlet, the sulfur-containing flue gas is passed through the electrostatic precipitator 1 and the bag filter 2 for dust removal treatment, then passed into the washing tower 3 and the packing tower 4 for washing, separation and purification, and then passed through the flue gas Air filter 5 filters;

[0029] (2) Transformation and absorption: what the embodiment of the present invention adopted is the two-turn-two-suction process, specifically as follows:

[0030] Primary transformation and primary absorption: pass the filtered flue gas through the contact chamber 6 for heat exchange, so that the SO in the flue gas 2 converted to SO 3 , converted to SO 3 Enter the first absorption tower 7 and carry out spray absorption by concentrated sulfuric acid, the liquid obtained after absorption flows out f...

Embodiment 2

[0037] Such as figure 1, a method for producing analytically pure sulfuric acid from smelting flue gas, comprising the steps of:

[0038] (1) Deep purification: from the flue gas inlet, the sulfur-containing flue gas is passed through the electrostatic precipitator 1 and the bag filter 2 for dust removal treatment, then passed into the washing tower 3 and the packing tower 4 for washing, separation and purification, and then passed through the flue gas Air filter 5 filters;

[0039] (2) Transformation and absorption: what the embodiment of the present invention adopted is the two-turn-two-suction process, specifically as follows:

[0040] Primary transformation and primary absorption: pass the filtered flue gas through the contact chamber 6 for heat exchange, so that the SO in the flue gas 2 converted to SO 3 , converted to SO 3 Enter the first absorption tower 7 and carry out spray absorption by concentrated sulfuric acid, the liquid obtained after absorption flows out fr...

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Abstract

The invention discloses a method for preparing analytical pure sulfuric acid by using smelting gas, belonging to the field of sulfuric acid preparation. The method comprises the following steps: (1) carrying out deep purification to obtain high-purity flue gas; (2) transforming and absorbing to obtain industrial sulfuric acid; (3) evaporating: evaporating the industrial sulfuric acid until SO3-containing gas is obtained; (4) purifying: purifying the SO3-containing gas, obtained by evaporation, for a second time; (5) absorbing: absorbing the purified SO3-containing gas to obtain refined sulfuric acid; (6) removing SO2, removing the SO2 of the refined sulfuric acid to obtain the analytical pure sulfuric acid. In the preparation process, the SO3-containing gas, obtained by evaporating the prepared industrial sulfuric acid, rather than the flue gas is directly adopted as a source of the sulfuric acid to be prepared, so that the purity of the sulfuric acid is improved. Furthermore, the SO3-containing gas obtained by evaporating the industrial sulfuric acid is also demisted by using a demister, and nitrogen oxides are absorbed by using expanded graphite, so that impurities such as the nitrogen oxides which are produced in the preparation process are further removed, and the prepared sulfuric acid reaches the grade of analytical pure.

Description

【Technical field】 [0001] The invention relates to the technical field of sulfuric acid preparation, and relates to a method for preparing analytically pure sulfuric acid from smelting flue gas. 【Background technique】 [0002] SO 2 The concentration is low, so it is not suitable to set up the flue gas to make acid. It is almost discharged after the flue gas is desulfurized. Not only does the flue gas not produce benefits, but it increases the environmental protection cost of the enterprise. The invention is based on the oxygen-enriched molten pool smelting treatment of brittle sulfur lead antimony ore smelting antimony new process to produce flue gas SO 2 The concentration is above 6.5%, so it is feasible to use domestic traditional technology to make acid. [0003] Oxygen-enriched molten pool smelting process lead sulphide ore lead smelting process, the flue gas is currently used as standard domestic traditional acid production process, but all of them are for the producti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/765C01B17/90
CPCC01B17/7655C01B17/90C01P2006/80
Inventor 韦竣严曹应科
Owner 河池市生富冶炼有限责任公司
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