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Method for recycling waste acid generated in production of sulfuric acid from smelting flue gas

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

Active Publication Date: 2016-01-06
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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  • Method for recycling waste acid generated in production of sulfuric acid from smelting flue gas
  • Method for recycling waste acid generated in production of sulfuric acid from smelting flue gas
  • Method for recycling waste acid generated in production of sulfuric acid from smelting flue gas

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Experimental program
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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 method for recycling waste acid generated in production of sulfuric acid from smelting flue gas. The method comprises the following steps: reducing waste acid by using Fe, performing evaporative crystallization to obtain FeSO4 crystals, enabling FeSO4 crystals to react with filter liquor, sulfuric acid and an oxidant generated in the activation step of producing activated clay from bentonite, so as to obtain polymeric aluminum ferric sulfate; selectively, enabling polymeric aluminum ferric sulfate to react with an organic flocculating agent, so as to obtain an organic-inorganic composite flocculating agent. According to the recycling method, the waste acid generated in the production process of sulfuric acid from smelting flue gas is adopted as a main raw material, and waste heat of smelting flue gas is utilized to produce the activated clay and the organic-inorganic composite flocculating agent which have broad markets in various industries, so that the problems about recovery of waste heat of high-temperature flue gas, treatment of waste acid, and seasonal storage of by-product sulfuric acid are solved; besides, plenty of valuable industrial products can also be produced; therefore, the method has quite high social benefit, environmental benefit and economic benefit.

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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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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