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A selective adsorption so 2 Adsorbent preparation method for hf and hcl in flue gas

A selective adsorption and SO2 technology, applied in chemical instruments and methods, separation methods, gas treatment, etc., can solve the problems of increasing operating costs, increasing corporate burdens, and consuming large energy to achieve good adsorption effects, simple methods, and reduced The effect of emissions

Active Publication Date: 2020-11-17
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This leads to two serious problems
First, the use of multi-stage dynamic wave technology will consume a lot of energy and increase the operating cost of the enterprise
The second is to produce a lot of dirty acid when changing the washing liquid
The treatment of dirty acid will increase the burden on enterprises

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A selective adsorption of SO 2 The preparation method of HF and HCl adsorbent in flue gas specifically comprises the following steps:

[0018] (1) C-γ-Al 2 o 3 Preparation: Al(NO 3 ) 3 Solution, in the ratio of 2g / L in Al(NO 3 ) 3 The solution was added to CTAB to obtain solution A; the NH 4 HCO 3 Dissolved in the mixed solution of CTAB and PEG to prepare solution B, NH in solution B 4 HCO 3 The concentration of CTAB is 0.5g / L, the concentration of CTAB is 2g / L, and the concentration of PEG is 0.5g / L; under vigorous stirring, slowly add solution B to solution A at a volume ratio of 1:1, and use nitric acid Adjust the pH value to 3.0, and continue to stir for 1 hour to obtain a wet gel; after aging the wet gel at room temperature for 54 hours, wash it with absolute ethanol, and dry it at 40°C. 2 C-γ-Al was obtained after calcination under atmosphere for 5 h 2 o 3 .

[0019] (2) Preparation of Ca@γ-Al by equal volume impregnation method 2 o 3 The specific s...

Embodiment 2

[0022] A selective adsorption of SO 2 The preparation method of HF and HCl adsorbent in flue gas specifically comprises the following steps:

[0023] (1) C-γ-Al 2 o 3 Preparation: Al(NO 3 ) 3 Solution, in the ratio of 1.5g / L in Al(NO 3 ) 3 The solution was added to P123 to obtain solution A; the NH 4 HCO 3 Dissolve in P123 and PVP mixed solution to prepare solution B, in solution B, NH 4 HCO 3 The concentration of P123 is 1g / L, the concentration of P123 is 1.5g / L, and the concentration of PVP is 1g / L; under vigorous stirring, slowly add solution B to solution A at a ratio of 1:1 by volume, and adjust with nitric acid The pH value reached 5, and the wet gel was obtained after continuing to stir for 1.5h; the wet gel was aged at room temperature for 40h, washed with absolute ethanol, and dried at 60°C, and the obtained dry gel was dried at 550°C, N 2 C-γ-Al was obtained after calcination under atmosphere for 3 h 2 o 3 .

[0024] (2) Preparation of Ca@γ-Al by equal vol...

Embodiment 3

[0027] A selective adsorption of SO 2 The preparation method of HF and HCl adsorbent in flue gas specifically comprises the following steps:

[0028] (1) C-γ-Al 2 o 3 Preparation: Al(NO 3 ) 3 Solution, in the ratio of 1g / L in Al(NO 3 ) 3 The solution was added to CTAB to obtain solution A; the NH 4 HCO 3 Dissolve in CTAB and polyvinyl alcohol mixed solution to prepare solution B, in solution B, NH 4 HCO 3 The concentration of CTAB is 1.5g / L, the concentration of CTAB is 2g / L, and the concentration of polyvinyl alcohol is 2g / L; under vigorous stirring, slowly add solution B to solution A in a volume ratio of 1:1, and use Adjust the pH value to 6.0 with nitric acid, and continue to stir for 2 hours to obtain a wet gel; the wet gel is aged at room temperature for 45 hours, washed with absolute ethanol, and dried at 70 ° C. 2 C-γ-Al was obtained after calcination under atmosphere for 2 h 2 o 3 .

[0029] (2) Preparation of Mg@γ-Al by equal volume impregnation method ...

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PUM

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Abstract

The invention discloses a preparation method of an adsorbent capable of selectively adsorbing HF and HCl in SO2 smoke and belongs to the field of industrial waste gas purification. Acid preparing smoke contains high-concentration SO2, thereby being capable of being used for preparing sulfuric acid; the smoke contains little HF and HCl which are prone to entering acid products to influence acid quality and prone to causing toxication and deactivation of an acid-preparing adsorbent. The adsorbent is an alkaline earth metal modified carbon doped gamma-Al2O3 composite material and has large specific surface area and pore volume and high adsorbability and selectivity; the adsorbent can efficiently and selectively adsorb HF and HCl in SO2 atmosphere and is high in adsorption capacity. SO2-enriched smelting tail gas can be ensured to meet acid-preparing needs, and corrosion of equipment and toxication of the acid-preparing adsorbent caused by HF and HCl can be reduced.

Description

technical field [0001] The present invention relates to a kind of selective adsorption SO 2 The invention discloses an adsorbent preparation method for HF and HCl in flue gas, belonging to the field of industrial waste gas purification. Background technique [0002] Non-ferrous metal ores mostly exist in the form of sulfide, so a large amount of high-concentration SO will be produced during the smelting process 2 (concentration of 2-3%) in the flue gas. At the same time, the flue gas contains a small amount of heavy metals and acid gases (HF and HCl). If the flue gas is directly discharged into the atmosphere without treatment, it will not only cause bad environmental pollution, but also cause significant economic losses. A feasible method is to use high concentration SO 2 Acid production from flue gas. This is a major measure to implement the national sustainable development strategy and realize the resource utilization of waste gas. [0003] At present, a new flue ga...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/30B01J20/08B01D53/02
CPCB01D53/02B01D2257/2045B01D2257/2047B01D2258/0283B01J20/02B01J20/08
Inventor 张秋林龙开先宁平王静刘昕孙梦晗
Owner KUNMING UNIV OF SCI & TECH
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