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A kind of resource utilization method of waste acid produced in smelting flue gas to produce sulfuric acid

A technology of smelting flue gas and recycling, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problems of low availability of sludge, waste of resources, slow sales of sulfuric acid, etc., to solve seasonal storage problems, reduce Cost, water saving effect

Active Publication Date: 2018-06-15
BEIJING OTC ENERGY & ENVIRONMENT ENGINEERING PUBLIC LIMITED COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the lime method requires a large amount of chemicals to neutralize the acid, and will produce a large amount of sludge, and the availability of the sludge is not large, resulting in a waste of resources
[0004] In addition, some manufacturers need to continuously produce sulfuric acid, but due to the large fluctuations in supply and demand market requirements, a large amount of sulfuric acid is unsalable in the off-season, and storage requires a lot of space. In order to ensure safe production, it is necessary to find a storage or utilization method for sulfuric acid

Method used

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  • A kind of resource utilization method of waste acid produced in smelting flue gas to produce sulfuric acid
  • A kind of resource utilization method of waste acid produced in smelting flue gas to produce sulfuric acid
  • A kind of resource utilization method of waste acid produced in smelting flue gas to produce sulfuric acid

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0087] (1) Treatment of waste acid

[0088] The waste acid reduction treatment adopts the field test of the pilot plant, and no external auxiliary operation equipment is designed. The specific implementation steps are as follows:

[0089] will be 1m 3 / h of waste acid is lifted to a 10μm membrane filter, and after pretreatment of part of the suspended matter, it overflows into the iron bed reactor. The coil heating system installed in the iron bed reactor keeps the temperature of the waste acid water at 50°C. The iron filings in the iron filings reactor of the iron bed reactor is 200kg. The iron filings are completely soaked in the waste acid, and the residence time is 7 hours. During the residence time, the stirrer rotates at a speed of 80-150r / min, and the stirring speed changes from slow to fast, and from fast to slow. After the complete reaction, the pH value of the obtained waste liquid is 5.1. After the reaction is completed, the gas generated is collected through a g...

Embodiment 2

[0103] (1) Treatment of waste acid

[0104] The waste acid reduction treatment adopts the field test of the pilot plant, and no external auxiliary operation equipment is designed. The specific implementation steps are as follows:

[0105] will be 1m 3 / h of spent acid (H 2 SO 4 The mass fraction is 2%) to promote a 50 μm membrane filter, and after pretreatment of part of the suspended matter, it overflows into the iron bed reactor, and the coil heating system installed in the iron bed reactor keeps the temperature of the waste acid water at 30°C. The iron filings in the iron filings reactor of the iron bed reactor is 200kg. The iron filings are completely soaked in the waste acid, and the residence time is 7 hours. During the residence time, the stirrer rotates at a speed of 80-150r / min, and the stirring speed changes from slow to fast, and from fast to slow. After the complete reaction, the pH value of the obtained waste liquid is 5.0. After the reaction is completed, th...

Embodiment 3

[0119] (1) Treatment of waste acid

[0120] The waste acid reduction treatment adopts the field test of the pilot plant, and no external auxiliary operation equipment is designed. The specific implementation steps are as follows:

[0121] will be 1m 3 / h of spent acid (H 2 SO 4The mass fraction is 5%) to promote a 30 μm membrane filter, and after pretreatment of part of the suspended matter, it overflows into the iron bed reactor, and the coil heating system installed in the iron bed reactor keeps the temperature of the waste acid water at 60°C. The iron filings in the iron filings reactor of the iron bed reactor is 200kg. The iron filings are completely soaked in the waste acid, and the residence time is 7 hours. During the residence time, the stirrer speed is 80-150r / min, and the stirring speed changes from slow to fast, and from fast to slow. After the complete reaction, the pH value of the obtained waste liquid is 6. After the reaction is completed, the gas generated ...

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Abstract

The invention provides a resource recovery method for waste acid produced in the production of sulfuric acid from smelting flue gas. The method is as follows: reducing the waste acid with Fe, obtaining FeSO4 crystals through evaporation and crystallization, and combining the FeSO4 crystals with bentonite to prepare activated clay. The filtrate produced in the activation step reacts with sulfuric acid and an oxidant to obtain polyaluminum ferric sulfate. Optionally, the polyaluminum ferric sulfate is reacted with an organic flocculant to obtain an organic-inorganic composite flocculant. The resource recovery method uses the waste acid produced in the process of producing sulfuric acid from smelting flue gas as the main raw material, and utilizes the waste heat of smelting flue gas to produce activated clay and organic-inorganic composite flocculants that have a broad market in various industries, solving the problem of high temperature Flue gas waste heat recovery and waste acid treatment problems, while solving the seasonal storage problem of by-product sulfuric acid, can also produce a large number of valuable industrial products, with high social, environmental and economic benefits.

Description

technical field [0001] The invention belongs to the technical field of pollutant treatment and waste resource utilization, and in particular relates to a resource recovery method for waste acid produced in sulfuric acid production from smelting flue gas. Background technique [0002] Removal of active ingredient SO for acid production from smelting flue gas 2 and O 2 In addition, dust, arsenic and fluoride cannot enter the acid system. The existing smelting flue gas acid production process adopts the water washing method to remove the above-mentioned harmful substances and lower the temperature. During the water washing process, part of the SO 2 and SO 3 Dissolved in water, the oxides, arsenides and fluorides of soluble valuable metals in the dust are all dissolved in water, causing the acidity of the washing water, the content of arsenic and fluorine, and the turbidity of suspended solids to rise continuously. Row. Washing water pollutes the environment due to acid and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F1/52C02F1/56C01B33/40
CPCY02P20/129
Inventor 周凤山张勇张余凯
Owner BEIJING OTC ENERGY & ENVIRONMENT ENGINEERING PUBLIC LIMITED COMPANY
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