Method for preparing sodium hydrosulphite from smeltery flue gas

A technology of sodium sulfite and smelting plant, which is applied in the direction of preparation, separation method, chemical instrument and method of alkali metal sulfite, which can solve problems affecting application, increase of production cost, unqualified quality of sodium sulfite products, etc., and achieve reduction of heat load , high purity, and realize the effect of recycling and resource utilization

Inactive Publication Date: 2015-04-01
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main technical difficulty of producing sodium sulfite from sulfur dioxide in smelter flue gas or acid-making tail gas is that the smelter flue gas contains a certain amount of oxygen. In the process of preparing sodium sulfite from sulfur dioxide, a considerable amount of sulfur dioxide is prone to oxidation to form sodium sulfate. , resulting in unqualified sodium sulfite product quality
The conventional process solution is to add antioxidants, such as p-phenylenediamine and other organic amines to inhibit oxidation, but this will lead to increased production costs and affect the industrial application of this technology

Method used

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  • Method for preparing sodium hydrosulphite from smeltery flue gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Flue gas composition is 10.0%SO 2 , 5.0%O 2 , and the rest are N 2 , flue gas flow 1m 3 / h, under the condition of normal pressure and 30°C, enter the furnace filled with Ala / γ-Al 2 o 3 The adsorption tower T101 ~ 103 (serial mode). When sulfur dioxide in flue gas selectively adsorbs and penetrates Ala / γ-Al 2 o 3 After the bed, use N 2 Enter the adsorption tower at 30°C to desorb T101-102, and desorb T103 at 50-120°C by temperature programming until it is completely desorbed. The desorbed gas enters the T201 absorption tower and is absorbed countercurrently with the water from the L201 storage tank. After the gas-liquid circulation is established in the absorption tower, the absorption liquid is extracted from the bottom circulating liquid tank L202 and injected into the top and middle of the absorption tower respectively. The ratio of tower top flow to mid-section circulation flow = 1:5, add 45% NaOH solution to L202 to adjust the pH value to 4-5, then put it i...

Embodiment 2

[0022] Flue gas composition is 5.0%SO 2 , 5.0%O 2 , and the rest are N 2 , flue gas flow rate 2m 3 / h, under the condition of normal pressure and 30°C, enter the Ala / γ-Al 2 o 3 The adsorption towers T101~102 (parallel mode) converge and then enter T103 (serial mode), when the sulfur dioxide in the flue gas selectively adsorbs and penetrates Ala / γ-Al 2 o 3 After fixing the bed layer, use N 2 Desorb T101-102 at 30°C, and desorb T103 at 50-120°C by temperature programming until complete desorption. The desorbed gas enters the absorption tower and is absorbed countercurrently with the water from the L201 tank, so that the tower establishes a gas-liquid cycle. The absorption liquid extracted from the circulating liquid tank L202 at the bottom of the absorption tower is poured into the top and middle section of the absorption tower respectively for circulation. The ratio of the flow rate at the top of the tower to the circulation flow in the middle section is 1:3. Add 45% NaO...

Embodiment 3

[0024] Flue gas composition is 1.0%SO 2 , 5.0%O 2, and the rest are N 2 , flue gas flow 3m 3 / h, under the condition of normal pressure and 20°C, enter the Ala / γ-Al 2 o 3 The adsorption and desorption towers T101-102 (parallel mode) converge and then enter T103 (serial mode). When sulfur dioxide in flue gas selectively adsorbs and penetrates Ala / γ-Al 2 o 3 After fixing the bed layer, use N 2 Desorb T101-102 at 30°C, and desorb T103 at 50-120°C by temperature programming until complete desorption. The desorbed gas enters the absorption tower and is absorbed countercurrently with the water from the L201 tank, so that the tower establishes a gas-liquid cycle. The absorption liquid extracted from the circulating liquid tank L202 at the bottom of the absorption tower is poured into the top and middle section of the absorption tower respectively for circulation, the ratio of the flow at the top of the tower to the circulating flow at the middle section is 1:2, and 46% NaOH s...

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Abstract

The invention discloses a method for preparing sodium hydrosulphite from smeltery flue gas and relates the field of sodium hydrosulphite. The method comprises the following steps of feeding flue gas into an adsorption bed filled with an alanine loading-type adsorbent Ala / gamma-Al2O3, carrying out selective adsorption of SO2 in flue gas, after penetration through the adsorption bed, carrying out adsorption by N2, feeding the desorbed SO2-containing flue gas into an absorption packed tower, carrying out counter current absorption of SO2 by water, after gas-liquid absorption circulation is built in the absorption packed tower, feeding the effluent from the bottom of the absorption packed tower into a circulation liquid tank, adjusting a pH value to 4-5 by a NaOH solution, feeding the sodium hydrogen sulfite-containing liquid in the circulation liquid tank into the top and the middle of the absorption packed tower, carrying out circulation to obtain sodium hydrogen sulfite having a concentration of 30 to 35% in the absorption packed tower effluent, adjusting a pH value to 11-12 by NaOH to obtain sodium hydrogen sulfite having a concentration of 28 to 32%, carrying out filtration to remove metal ion precipitates, and carrying out evaporative crystallization to obtain a sodium hydrosulphite product.

Description

technical field [0001] The invention relates to sodium sulfite, in particular to a method for preparing sodium sulfite with smelter flue gas. Background technique [0002] Sulfur dioxide has become one of the main pollutants of air pollution. At present, the treatment of sulfur dioxide in the flue gas of smelters is mainly based on the production of acid from flue gas. However, due to the inconvenient transportation in mining areas where most smelters are located, the sulfuric acid produced is not easy to store for a long time as a corrosive liquid, and its ability to resist market price fluctuations is poor, which affects the normal production of smelters. Sodium sulfite, as an important chemical product, can be stored for a long time, and is widely used in fine chemical industry, papermaking and other industries. Most of the industrial sodium sulfite preparation processes are direct alkali absorption technology through sulfur oxidation to sulfur dioxide. In recent years,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01D5/14B01D53/02
Inventor 贾立山田中标苏帅邓人攀李清彪黄怀国林鸿汉叶志勇
Owner XIAMEN UNIV
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