CN103723873B - Method for treating waste acid in acid-making with smelting gas - Google Patents
Method for treating waste acid in acid-making with smelting gas Download PDFInfo
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- CN103723873B CN103723873B CN201410011668.6A CN201410011668A CN103723873B CN 103723873 B CN103723873 B CN 103723873B CN 201410011668 A CN201410011668 A CN 201410011668A CN 103723873 B CN103723873 B CN 103723873B
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Abstract
The invention discloses a method for treating waste acid in acid-making with smelting gas. The method comprises the following steps of: adding lime to waste acid to neutralize until pH (Power of Hydrogen) reaches 2 to 3; precipitating calcium sulfate and other impurities; filtering to remove calcium sulfate and other impurities; adding sodium hydroxide to filtrate to regulate the pH to be 6 to 7; adding 0.5 to 0.1% of fenton agent; performing microwave radiation for 25 seconds under the condition that the microwave frequency is 915M and the power is 1kw; filtering once more; adding sodium hydroxide to the obtained filtrate to regulate the pH to be 9 to 9.5; adding 0.5 to 0.1% of flocculant, namely, polyacrylamide; performing microwave radiation for 25 seconds under the condition that the microwave frequency is 915M and the power is 1kw; precipitating; and then draining the liquid meeting the drainage standard.
Description
Technical field
The present invention relates to chemical field, specifically, the present invention relates to a kind of method processing dirty acid.
Background technology
A large amount of flue gases can be produced in pyrometallurgical smelting process, wherein comprise a large amount of SO2 gas and harmful heavy metal component such as mercury, cadmium, lead, chromium.In existing environmental pollutant, heavy metal Hg, cadmium, lead, chromium and metalloid arsenic, all absorbed humans and animals harm very serious by various approach such as respiratory tract, digestive tube and skins.Because heavy metal can not be degraded by microorganisms, mutual conversion between various form can only be there is in the environment so, the elimination of heavy metal contamination is often very difficult, and its impact and harm become the problem that people pay close attention to.Existing flue gas during smelting, from environmental protection and comprehensive utilization angle, adopts double conversion double absorption acid making system to realize fume recovery and SO2 relieving haperacidity.In the process utilizing flue gas Sulphuric acid, arsenic wherein, cadmium, fluorine etc. are transferred to again in the dirt acid of washing flue gas generation, and containing harmful toxic matters such as lead, arsenic, cadmiums in dirty acid, and content is higher than general trade effluent, very big to environmental hazard.Therefore, dirty acid needs, after sewage works process is up to standard, could discharge;
The acid-treated method of existing dirt has a lot, ferrous sulfate-lime method, sodium sulfide method, and various have its weak point, and main deficiency is embodied in poor processing effect, and treating processes is simple, cannot ensure in the problems such as treatment effect stability.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned deficiency of the prior art, and provide a kind of method processing dirty acid in metallurgical off-gas acid-making, it has treatment time section, the advantage that cost ineffective fruit is good.
The technical solution adopted for the present invention to solve the technical problems is: a kind of method processing dirty acid in metallurgical off-gas acid-making, comprises following steps:
(1) in dirty acid, limestone vegetation ph to 2 ~ 3 are added;
(2) solution that step (1) obtains is filtered, filter out the filter residue comprising calcium sulfate, obtain filtrate;
(3) filtrate obtained in step (2) is added sodium hydroxide and adjust ph to 6 ~ 7, then add the fenton reagent of 0.5-1 ‰, mix, obtain mixed solution;
(4) mixed solution that step (3) obtains is carried out microwave radiation 25 seconds, microwave frequency is 915,000,000, and power is 1 kilowatt, obtains first time microwave radiation solution;
(5) the first time microwave radiation solution obtained in step (4) is filtered, filter out filter residue, obtain filtrate;
(6) filtrate obtained in step (5) is added sodium hydroxide and adjust ph to 9-9.5, add flocculation agent 0.5-1 ‰, then carry out microwave radiation 25 seconds, microwave frequency is 915,000,000, and power is 1 kilowatt; Obtain second time microwave radiation solution;
(7), after microwave radiation solution precipitation step (6) obtained, namely solution reach emission standard, and discharge.
As a kind of optimal way of the present invention: the flocculation agent in above-mentioned steps (6) is polyacrylamide.
As a kind of optimal way of the present invention: the microwave radiation of above-mentioned steps (4) and step (6) is produced by the same microwave generator of adjustable microwave frequency and power.
As a kind of optimal way of the present invention: above-mentioned steps is carried out in (3) in steel basin, particularly the filtrate obtained in step (2) is added steel basin, stir while add sodium hydroxide in steel basin simultaneously, final tune ph to 6 ~ 7, the last fenton reagent adding 0.5-1 ‰ again, mix, obtain mixed solution, Fenton reagent is primarily of hydrogen peroxide and ferrous sulfate composition.
As a kind of optimal way of the present invention: the dirt acid that above-mentioned dirty acid is arranged outward for smelting acid making system.
Beneficial effect of the present invention:
The present invention adopts " limestone vegetation-microwave+fenton reagent-flocculating polymer " pattern, and belong to a kind of ferrite process, the method removal effect is good, installation cost and running cost low, floor space is little; The present invention adopts microwave ferrite method, it is the principle produced according to ferrite, utilize the heating efficiency of microwave to sewage high, and the diamagnetism of the ferrous ion that technique produces and ferric paramagnetism, in microwave field, the fierce concussion (915,000,000 microwave vibrations per second nearly hundred million times) of generation and heavy metal are combined in microwave field and generate ferrite rapidly.
It comprises following advantage compared with existing dirty acid treatment method in the present invention:
(1) treatment time is short: generally completed within 30 seconds; (2) processing cost is low: the cheap ferrous sulfate of general employing and a small amount of hydrogen peroxide, principle utilizes microwave to accelerate hydrogen peroxide to the oxidation of ferrous iron, make its generating portion ferric ion, and and ferrous ion and heavy metal be combined in microwave field and generate ferrite rapidly; (3) floor space is little is its another large advantage.
Accompanying drawing explanation
Fig. 1 is schema of the present invention.
Embodiment
Below in conjunction with embodiment, the specific embodiment of the invention is described:
Fig. 1 shows the method flow diagram of dirty acid in process metallurgical off-gas acid-making disclosed in this invention, its specific implementation process is: first add limestone vegetation in dirty acid to ph to 2 ~ 3, be precipitated out the impurity such as calcium sulfate, filter out the impurity such as these calcium sulfate, filtrate adds sodium hydroxide and adjusts ph to 6 ~ 7, then adds the fenton reagent of 0.5-1 ‰, then carries out microwave radiation 25 seconds, microwave frequency is 915,000,000, and power is 1 kilowatt.And then filter once, the filtrate obtained adds sodium hydroxide and adjusts ph to 9-9.5, and add flocculation agent polyacrylamide 0.5-1 ‰, then carry out microwave radiation 25 seconds, microwave frequency is 915,000,000, and power is 1 kilowatt.The rear liquid of precipitation reaches emission standard and discharges.
According to above method, we have done following examples:
Get a certain amount of dirty acid to measure, wherein the concentration of Pb, Zn, Cu, Cd, As is respectively 19.293, and 15.38,0.154,9.43 and 89.625mg/l; In this dirty acid solution, add limestone vegetation PH to 2.5, after being filtered by solution, filtrate adds sodium hydroxide and adjusts ph to 6.5, add the fenton reality of 0.75 ‰ again, then irradiate 25 seconds with microwave generator, the microwave frequency that this microwave generator produces is 915,000,000, and power is 1 kilowatt; By the solution after microwave irradiation in filtration once, filtrate adds sodium hydroxide and adjusts ph to 8.25, adds flocculation agent polyacrylamide 0.75 ‰, and then irradiate 25 seconds with microwave generator, the microwave frequency that this microwave generator produces is similarly 915,000,000, and power is 1 kilowatt, after precipitation, solution is measured, obtain Pb, Zn, Cu, the concentration of Cd, As is respectively 0.425, and 0.050,0.058,0.084 and 0.308mg/l
The dirt of different heavy metal content concentration acid is also tested according to method of the present invention by we, and it is as follows finally to gather multiple test-results:
Above the preferred embodiment for the present invention is explained in detail, but the invention is not restricted to above-mentioned embodiment, in the ken that those of ordinary skill in the art possess, can also make a variety of changes under the prerequisite not departing from present inventive concept.
Do not depart from the spirit and scope of the present invention and can make other changes many and remodeling.Should be appreciated that and the invention is not restricted to specific embodiment, scope of the present invention is defined by the following claims.
Claims (1)
1. process a method for dirty acid in metallurgical off-gas acid-making, it is characterized in that, comprise following steps:
(1) in dirty acid, limestone vegetation pH to 2 ~ 3 are added;
(2) solution that step (1) obtains is filtered, filter out the filter residue comprising calcium sulfate, obtain filtrate;
(3) filtrate obtained in step (2) is added sodium hydroxide and adjust pH to 6 ~ 7, then add the fenton reagent of 0.5-1 ‰, mix, obtain mixed solution;
(4) mixed solution that step (3) obtains is carried out microwave radiation 25 seconds, microwave frequency is 915,000,000, and power is 1 kilowatt, obtains first time microwave radiation solution;
(5) the first time microwave radiation solution obtained in step (4) is filtered, filter out filter residue, obtain filtrate;
(6) filtrate obtained in step (5) is added sodium hydroxide and adjust pH to 9-9.5, add flocculation agent 0.5-1 ‰, then carry out microwave radiation 25 seconds, microwave frequency is 915,000,000, and power is 1 kilowatt; Obtain second time microwave radiation solution;
(7), after microwave radiation solution precipitation step (6) obtained, namely solution reach emission standard, and discharge;
Flocculation agent in described step (6) is polyacrylamide;
The microwave radiation of described step (4) and step (6) is produced by the same microwave generator of adjustable microwave frequency and power;
Described step is carried out in (3) in steel basin, particularly the filtrate obtained in step (2) is added steel basin, stirs simultaneously and add sodium hydroxide in steel basin, final tune pH to 6 ~ 7, the last fenton reagent adding 0.5-1 ‰ again, mixes, obtains mixed solution;
The dirt acid that described dirty acid is arranged outward for smelting acid making system.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410011668.6A CN103723873B (en) | 2014-01-10 | 2014-01-10 | Method for treating waste acid in acid-making with smelting gas |
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| CN201410011668.6A CN103723873B (en) | 2014-01-10 | 2014-01-10 | Method for treating waste acid in acid-making with smelting gas |
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| CN103723873A CN103723873A (en) | 2014-04-16 |
| CN103723873B true CN103723873B (en) | 2015-03-18 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104829001B (en) * | 2015-04-21 | 2016-10-19 | 上海交通大学 | The low slag processed for waste acid neutralizes and the method for heavy metals removal and resource |
| CN105399182B (en) * | 2015-12-25 | 2018-03-27 | 中南大学 | A kind of method for efficiently removing heavy metal in waste acid |
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| CN101456604A (en) * | 2008-12-31 | 2009-06-17 | 广东上九生物降解塑料有限公司 | Method for quick processing wastewater by using microwave energy |
| CN101767859A (en) * | 2010-01-19 | 2010-07-07 | 却力挥 | Waste water treatment method combining Fenton oxidization and microwave catalysis phase |
| CN101830583B (en) * | 2010-03-25 | 2012-12-12 | 云南铜业股份有限公司 | Method for treating waste acid by gypsum sedimentation, arsenic oxidizing sedimentation and iron salt neutralization and co-precipitation |
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