CN103723873A - 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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- CN103723873A CN103723873A CN201410011668.6A CN201410011668A CN103723873A CN 103723873 A CN103723873 A CN 103723873A CN 201410011668 A CN201410011668 A CN 201410011668A CN 103723873 A CN103723873 A CN 103723873A
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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, particularly, the present invention relates to a kind of method of processing dirty acid.
Background technology
In pyrometallurgical smelting process, can produce a large amount of flue gases, wherein comprise the heavy metal compositions such as a large amount of SO2 gas and harmful mercury, cadmium, lead, chromium.In existing environmental pollutant, heavy metal Hg, cadmium, lead, chromium and metalloid arsenic, all can be 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, so can only there is the mutual conversion between various forms in environment, 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 utilizing the process of flue gas sulfuric acid processed, arsenic wherein, cadmium, fluorine etc. are transferred to again in the dirt acid of washing flue gas generation, contain the harmful toxic matters such as lead, arsenic, cadmium, and content are higher than general trade effluent in dirty acid, very big to environmental hazard.Therefore, dirty acid need to through sewage works process up to standard after, could discharge;
The acid-treated method of existing dirt has a lot, ferrous sulfate-lime method, and sodium sulfide method, various have its weak point, and main deficiency is embodied in poor processing effect, and treating processes is simple, cannot guarantee 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 a kind of method of processing dirty acid in metallurgical off-gas acid-making is provided, and it has treatment time section, the low effective advantage of cost.
The technical solution adopted for the present invention to solve the technical problems is: a kind of method of processing dirty acid in metallurgical off-gas acid-making, comprises following steps:
(1) in dirty acid, add lime in and ph to 2～3;
(2) solution step (1) being obtained filters, and filters out the filter residue that comprises calcium sulfate, obtains filtrate;
(3) filtrate obtaining in step (2) is added sodium hydroxide adjust ph to 6～7, then add the fenton reagent of 0.5-1 ‰, mix, obtain mixed solution;
(4) mixed solution step (3) being obtained carries out microwave radiation 25 seconds, and microwave frequency is 915,000,000, and power is 1 kilowatt, obtains microwave radiation solution for the first time;
(5) by the solution filter of microwave radiation for the first time obtaining in step (4), filter out filter residue, obtain filtrate;
(6) filtrate obtaining in step (5) is added sodium hydroxide 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 microwave radiation solution for the second time;
(7), after microwave radiation solution precipitation step (6) being obtained, 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, concrete is that the filtrate obtaining in step (2) is added to steel basin, in steel basin, while stirring, add sodium hydroxide simultaneously, final ph to 6～7 of adjusting, the last fenton reagent that adds again 0.5-1 ‰, mix, obtain mixed solution, Fenton reagent is mainly comprised of hydrogen peroxide and ferrous sulfate.
As a kind of optimal way of the present invention: above-mentioned dirty acid be that the smelting acid making system dirt of arranging is outward sour.
Beneficial effect of the present invention:
The present invention adopts " lime neutralization-microwave+fenton reagent-flocculating polymer " pattern, belongs to a kind of ferrite process, and the method removal effect is good, and installation cost and running cost are low, and floor space is little; The present invention adopts microwave ferrite method, it is the principle producing according to ferrite, utilize microwave high to the heating efficiency of sewage, and there is fierce concussion (915,000,000 microwave vibrations per second nearly hundred million times) and heavy metal and be combined in the rapid ferrite that generates in microwave field in diamagnetism and the ferric paramagnetism of the ferrous ion that technique produces in microwave field.
The present invention compares it with existing dirty acid treatment method and comprises following advantage:
(1) treatment time is short: generally within 30 seconds, complete; (2) processing cost is low: generally adopt cheap ferrous sulfate and a small amount of hydrogen peroxide, principle is to utilize microwave to accelerate hydrogen peroxide to ferrous oxidation, make its generating portion ferric ion, and be combined in the rapid ferrite that generates in microwave field with ferrous ion and heavy metal; (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 processing metallurgical off-gas acid-making disclosed in this invention, its specific implementation process is: in dirty acid, first add lime to be neutralized 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 to adjust 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 obtaining adds sodium hydroxide to adjust ph to 9-9.5, adds flocculation agent polyacrylamide 0.5-1 ‰, then carries out microwave radiation 25 seconds, and 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 and measure, Pb wherein, Zn, Cu, Cd, the concentration of As is respectively 19.293,15.38, and 0.154,9.43 and 89.625mg/l; Add lime in this dirt acid solution in, with PH to 2.5, by after solution filter, filtrate adds sodium hydroxide to adjust ph to 6.5, add again 0.75 ‰ fenton actual, then with microwave generator, irradiate 25 seconds, the microwave frequency that this microwave generator produces is 915,000,000, and power is 1 kilowatt; Solution after microwave irradiation is being filtered once, and filtrate adds sodium hydroxide to adjust 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, obtained Pb, Zn, Cu, Cd, the concentration of As is respectively 0.425,0.050,0.058,0.084 and 0.308mg/l
We also test the dirt acid of different heavy metal content concentration according to method of the present invention, finally gather a plurality of test-results as follows:
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 possessing those of ordinary skills, can also under the prerequisite that does not depart from aim of the present invention, make a variety of changes.
Do not depart from the spirit and scope of the present invention and can make many other changes 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 (5)
1. a method of processing dirty acid in metallurgical off-gas acid-making, is characterized in that, comprises following steps:
(1) in dirty acid, add lime in and ph to 2～3;
(2) solution step (1) being obtained filters, and filters out the filter residue that comprises calcium sulfate, obtains filtrate;
(3) filtrate obtaining in step (2) is added sodium hydroxide adjust ph to 6～7, then add the fenton reagent of 0.5-1 ‰, mix, obtain mixed solution;
(4) mixed solution step (3) being obtained carries out microwave radiation 25 seconds, and microwave frequency is 915,000,000, and power is 1 kilowatt, obtains microwave radiation solution for the first time;
(5) by the solution filter of microwave radiation for the first time obtaining in step (4), filter out filter residue, obtain filtrate;
(6) filtrate obtaining in step (5) is added sodium hydroxide 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 microwave radiation solution for the second time;
(7), after microwave radiation solution precipitation step (6) being obtained, solution reach emission standard, and discharge.
2. a kind of method of processing dirty acid in metallurgical off-gas acid-making as claimed in claim 1, is characterized in that, the flocculation agent in described step (6) is polyacrylamide.
3. a kind of method of processing dirty acid in metallurgical off-gas acid-making as claimed in claim 1, is characterized in that, the microwave radiation of described step (4) and step (6) is produced by the same microwave generator of adjustable microwave frequency and power.
4. a kind of method of processing in metallurgical off-gas acid-making dirty acid as claimed in claim 1, it is characterized in that, described step is carried out in (3) in steel basin, concrete is that the filtrate obtaining in step (2) is added to steel basin, in steel basin, while stirring, add sodium hydroxide, finally adjust ph to 6～7, finally add again the fenton reagent of 0.5-1 ‰ simultaneously, mix, obtain mixed solution.
5. a kind of method of processing dirty acid in metallurgical off-gas acid-making as claimed in claim 1, is characterized in that, the dirt acid that described dirty acid is the outer row of smelting acid making system.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104829001A (en) * | 2015-04-21 | 2015-08-12 | 上海交通大学 | Low residue neutralization, heavy metal removal and recycling method for contaminated acid treatment |
| CN105399182A (en) * | 2015-12-25 | 2016-03-16 | 中南大学 | Method for high efficiently removing heavy metals from polluted acid |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101830583A (en) * | 2010-03-25 | 2010-09-15 | 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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- 2014-01-10 CN CN201410011668.6A patent/CN103723873B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN101830583A (en) * | 2010-03-25 | 2010-09-15 | 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 |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104829001A (en) * | 2015-04-21 | 2015-08-12 | 上海交通大学 | Low residue neutralization, heavy metal removal and recycling method for contaminated acid treatment |
| 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 |
| CN105399182A (en) * | 2015-12-25 | 2016-03-16 | 中南大学 | Method for high efficiently removing heavy metals from polluted acid |
| 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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