Energy saving process and system for comprehensively recycling waste acid of sulfuric acid purification

An energy-saving system, sulfuric acid technology, applied in the fields of inorganic chemistry, arsenic compounds, chemical instruments and methods, etc., can solve the problems of low electric energy cost in the power grid, problems in economic feasibility, and low value of recycling, etc. low cost effect

Active Publication Date: 2017-01-04
中铝环保节能集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The MVR system can only handle solutions with a boiling point of up to 20°C, and the concentration of sulfuric acid can only be increased to 48%, so the value of recycling is not great
On the other hand, the cost of grid electricity consumed by MVR is not low. Unless a self-provided power station is built, there are also problems in economic feasibility.

Method used

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  • Energy saving process and system for comprehensively recycling waste acid of sulfuric acid purification
  • Energy saving process and system for comprehensively recycling waste acid of sulfuric acid purification
  • Energy saving process and system for comprehensively recycling waste acid of sulfuric acid purification

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The energy-saving system includes a primary scrubber 1; the side of the primary scrubber 1 is provided with a vertically arranged air inlet pipe 2; the lower part of the primary scrubber 1 is provided with a circulating acid outlet, and the circulating acid outlet passes through the washing circulation pump It communicates with the acid outlet nozzle 3 arranged inside the intake pipe 2; the top of the first-stage scrubber 1 is provided with a flue gas outlet, and the flue gas outlet is connected with the traditional purification process system; the bottom of the first-stage scrubber 1 is provided with a compressor Air aeration device 4; the lower part of the first-stage washing tower 1 is also provided with an acid outlet, and the acid outlet is communicated with the cooling and enriching tower 6 through the washing delivery pump 5; the cooling and enriching tower 6 is connected with the sulfuric acid dry absorption process system connected; the lower part of the cooling...

example

[0031] 1. Contains H 2 O is 5%, SO 2 Concentration>5%, SO 3 The smelting flue gas with a concentration of 0.2% and a temperature of 300°C enters the first-stage scrubber, contacts with the acid liquid pumped in from the scrubbing cycle acid pump in countercurrent, and undergoes mass and heat transfer. The cycle acid temperature is 147°C and the acid concentration is 80%. 30% SO in flue gas 3 Directly into the washing cycle acid solution, the remaining 70% SO 3 With the flue gas, it enters the follow-up traditional purification equipment, and returns it to the primary scrubber in the form of condensed dilute acid to recover all the SO in the flue gas 3 ingredients, there is no dilute acid efflux at this time. According to the water balance in the scrubber, a small amount of new water should be added to the scrubber to maintain the 80% acid concentration in the scrubber. The flue gas is washed by high-temperature acid in the first-stage scrubber, and the temperature drops ...

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Abstract

The invention discloses an energy saving process for comprehensively recycling waste acid of sulfuric acid purification. The energy saving process comprises the following steps: high-temperature flue gas is fed into a first-stage washing tower; acidic liquor at the bottom of a tower is pumped to an acid discharging spraying head in a gas inlet pipeline of the first-stage washing tower, and the acidic liquor is in contact with the high-temperature flue gas reversely to absorb SO3 in the flue gas; the flue gas washed by the acidic liquor is cooled and then enters a subsequent conventional purification process for continuous cooling, and condensed diluted acid generated in the subsequent cooling process is returned into the first-stage washing tower to keep the SO3 and water in the tower balanced; heavy metal dust and arsenic elements in the flue gas form sulfate and arsenious acid after being washed by the acidic liquor; a compressed air aeration device oxidizes the arsenious acid in the acidic liquor into arsenic acid; the acidic liquor containing the arsenic acid and the heavy metal acid salt is conveyed into a cooling and thickening tower; concentrated acid from the cooling and thickening tower is filtered by a slag filter to filter out heavy metal sulfate slag; filtrate enters an SO2 reducing tank, and high-concentration SO2 gas is fed into the tank, so that the arsenic acid is reduced into arsenious acid precipitates which can be slightly dissolved in the sulfuric acid; the acidic liquor containing the arsenious acid precipitates is subjected to solid-liquid separation to obtain an arsenious acid filter cake.

Description

technical field [0001] The invention relates to an energy-saving process and system for comprehensively recovering sulfuric acid to purify waste acid. Background technique [0002] At present, the waste acid in the purification system in the flue gas acid production process is used to remove heavy metal ions such as As and Cu by using alkali sulfide or alkali agent, and then enter the sewage treatment system of the whole plant after neutralization. Although the waste acid was neutralized and As and Cu ions were extracted, a large amount of gypsum containing heavy metals was produced, which was almost unusable, and the long-term stacking caused serious secondary pollution, which was extremely difficult to deal with. [0003] Someone in the titanium dioxide industry proposed to enrich and recover waste acid in the system by means of multi-effect evaporation, but the operating conditions are extremely harsh. Because if about 10% of waste sulfuric acid is concentrated to more t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/14B01D53/78B01D53/64C01G28/00
CPCB01D53/1406B01D53/1481B01D53/1493B01D53/64B01D53/78B01D2251/506B01D2252/10B01D2258/0283C01G28/005
Inventor 朱智颖袁爱武
Owner 中铝环保节能集团有限公司
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