CN104860445A - Method for treating arsenic-containing wastewater by using pyrite cinder - Google Patents
Method for treating arsenic-containing wastewater by using pyrite cinder Download PDFInfo
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- CN104860445A CN104860445A CN201510296446.8A CN201510296446A CN104860445A CN 104860445 A CN104860445 A CN 104860445A CN 201510296446 A CN201510296446 A CN 201510296446A CN 104860445 A CN104860445 A CN 104860445A
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Abstract
The invention provides a method for treating arsenic-containing wastewater by using pyrite cinder. The method is characterized by comprising a step of sequentially adding the following raw materials in parts by weight: 2-3 parts of sulfuric acid, 5-10 parts of pyrite cinder, 2-4 parts of ammonium hydroxide, 2-3 parts of caustic soda flakes and 5-8 parts of a PAM (polyacrylamide) flocculating agent into 200-250 parts of arsenic-containing wastewater. Through the adoption of the method, the arsenic content in the arsenic-containing wastewater can be reduced to reach the waste discharge or recovery standard, and the utilization efficiency of the pyrite cinder is greatly improved.
Description
Technical field
What the present invention relates to is a kind for the treatment of process of arsenic-containing waste water, is specifically related to a kind of method adopting pyrite Slag treatment arsenic-containing waste water.
Background technology
Utilize sulphur ore deposit to carry out relieving haperacidity in the industry to have formed more conventional means existing, but the sewage of a large amount of a kind of arsenic-containing acids can be produced in acid manufacturing processes, cannot smooth discharge or directly recycle.
For sulfuric acid industry arsenic-containing acid sewage, current conventional treatment process adopts first feeding lime stone breast that sewage Free Acid is made azurite, then two sections of limestone vegetation process are used, and add ferrous sulfate simultaneously, remove the heavy metal ion such as the arsenic in sewage, sewage effluent is finally made to reach discharging standards, sewage after process can reuse, but this procedure is comparatively loaded down with trivial details, wastewater treatment is slower, and cost drops into larger, effect is not ideal, reach pollution exhaust criteria reluctantly, and can chlorion be produced, make to adopt metallic conduit when reclaiming waste water, the problems such as corrosion pipeline exist.
Summary of the invention
The object of the invention is to overcome the deficiencies in the prior art, provide a kind of method of pyrite Slag treatment arsenic-containing waste water, the method not only can reduce the arsenic content in arsenic-containing waste water, it is made to reach pollution exhaust criteria, and can pyrite cinder be used, pyrite cinder is as a kind of Industrial Solid Waste, there is complicated component, pH value is lower, iron-holder is lower, use value is not high, so play sizable indispensable effect in the present invention, sulfuric acid is coordinated arsenic-containing waste water to be made the mixed solution of sulfur acid iron ion, treat that next step processes, ammoniacal liquor is by H+ in mixed solution, Fe2+, Fe3+ complete reaction, obtain ferric hydroxide precipitate, the effect of sheet alkali is that molysite soluble in water and ferrous salt are hydrolyzed generation two valency and trivalent ferric hydroxide colloid, As2O3 generates the arsenic acid molysite of indissoluble with Fe (OH) 3 again, particles in solution thing and suspended substance carry out de-steady by last flocculation agent, the water of building bridge after adsorbing postprecipitation, just can qualified discharge.
The present invention is achieved by the following technical solutions, a kind of method of sulfuric acid ore deposit slag process arsenic-containing waste water, sulfuric acid, pyrite cinder, ammoniacal liquor, sheet alkali, PAM flocculation agent etc. are added successively in arsenic-containing waste water, it is characterized in that: need in 200-250 part arsenic-containing waste water to add 2-3 part sulfuric acid, 5-10 part pyrite cinder, 2-4 part ammoniacal liquor, 2-3 part sheet alkali and 5-8 part PAM flocculation agent successively, comprise the following steps:
(1) arsenic-containing waste water is entered collecting tank by sewage network, in pond, add sulfuric acid and pyrite cinder, after stirring, produce the mixed solution of sulfur acid iron ion;
(2) add proper ammonia, control PH, at 5-9, makes H+, Fe2+, Fe3+ complete reaction in solution, obtains ferric hydroxide precipitate;
(3) add sheet alkali, when pH value of sewage water brings up to 8-9, molysite soluble in water and ferrous salt are hydrolyzed generation two valency and trivalent ferric hydroxide colloid, and As2O3 generates the arsenic acid molysite of indissoluble with Fe (OH) 3 again;
(4) add PAM flocculation agent, stir, by de-steady, the bridge formation adsorption of flocculation agent, the particulate matter in cohesion water, suspended substance, and then water arsenic qualified discharge after precipitation or recycling.
The present invention has the following advantages compared to existing technology:
(1) process the arsenic-containing waste water of generation fast and effectively, without the need to waiting for, the water after process can directly recycling, can not produce corrode metallic conduit.
(2) pyrite cinder adopted in the present invention be mainly sulfurous iron ore fire after by product, there are reserves large, and improve value of salvaged materials, reach the object turned waste into wealth.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention.
Embodiment
Elaborate to embodiments of the invention below, the present embodiment is implemented under premised on technical solution of the present invention, give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
Embodiment 1
(1) arsenic-containing waste water 200 parts is entered collecting tank by sewage network, in pond, add 2 parts of sulfuric acid and 5 parts of pyrite cinders, after stirring, produce the mixed solution of sulfur acid iron ion;
(2) add 2 parts of ammoniacal liquor, control PH, at 5-9, makes H+, Fe2+, Fe3+ complete reaction in solution, obtains ferric hydroxide precipitate;
(3) add 2 parts of sheet alkali, when pH value of sewage water brings up to 8-9, molysite soluble in water and ferrous salt are hydrolyzed generation two valency and trivalent ferric hydroxide colloid, and As2O3 generates the arsenic acid molysite of indissoluble with Fe (OH) 3 again;
(4) add 5 parts of PAM flocculation agents, stir, by de-steady, the bridge formation adsorption of flocculation agent, the particulate matter in cohesion water, suspended substance, and then the water arsenic rear discharge up to standard after precipitation.
Embodiment 2
(1) arsenic-containing waste water 230 parts is entered collecting tank by sewage network, in pond, add 3 parts of sulfuric acid and 7 parts of pyrite cinders, after stirring, produce the mixed solution of sulfur acid iron ion;
(2) add 3 parts of ammoniacal liquor, control PH, at 5-9, makes H+, Fe2+, Fe3+ complete reaction in solution, obtains ferric hydroxide precipitate;
(3) add 3 parts of sheet alkali, when pH value of sewage water brings up to 8-9, molysite soluble in water and ferrous salt are hydrolyzed generation two valency and trivalent ferric hydroxide colloid, and As2O3 generates the arsenic acid molysite of indissoluble with Fe (OH) 3 again;
(4) add 7 parts of PAM flocculation agents, stir, by de-steady, the bridge formation adsorption of flocculation agent, the particulate matter in cohesion water, suspended substance, and then the water arsenic rear discharge up to standard after precipitation.
Embodiment 3
(1) arsenic-containing waste water 250 parts is entered collecting tank by sewage network, in pond, add 3 parts of sulfuric acid and 10 parts of pyrite cinders, after stirring, produce the mixed solution of sulfur acid iron ion;
(2) add 4 parts of ammoniacal liquor, control PH, at 5-9, makes H+, Fe2+, Fe3+ complete reaction in solution, obtains ferric hydroxide precipitate;
(3) add 3 parts of sheet alkali, when pH value of sewage water brings up to 8-9, molysite soluble in water and ferrous salt are hydrolyzed generation two valency and trivalent ferric hydroxide colloid, and As2O3 generates the arsenic acid molysite of indissoluble with Fe (OH) 3 again;
(4) add 8 parts of PAM flocculation agents, stir, by de-steady, the bridge formation adsorption of flocculation agent, the particulate matter in cohesion water, suspended substance, and then the water arsenic rear discharge up to standard after precipitation.
Technical process in the present invention is as shown in Figure 1 such: 1, put into by arsenic-containing waste water after then collecting tank adds sulfuric acid and pyrite cinder and enter into neutralization tank.
2, reaction tank is entered into after adding ammoniacal liquor in neutralization tank.
3, materialization coagulation basin is entered into after adding sheet alkali in reaction tank.
4, enter settling pond after adding PAM flocculation agent in materialization coagulation basin, materialization coagulation pool side is provided with sludge thickener and sludge treating system.
5, the water in settling pond can directly discharge.
Above embodiment only in order to the present invention is described and and unrestricted technical scheme described in the invention; Therefore, although this specification sheets with reference to each above-mentioned embodiment to present invention has been detailed description, those of ordinary skill in the art should be appreciated that and still can modify to the present invention or equivalent to replace; And all do not depart from technical scheme and the improvement thereof of the spirit and scope of the present invention, all should be encompassed in right of the present invention.
Claims (1)
1. the method for a pyrite Slag treatment arsenic-containing waste water, sulfuric acid, pyrite cinder, ammoniacal liquor, sheet alkali, PAM flocculation agent etc. are added successively in arsenic-containing waste water, it is characterized in that: need in 200-250 part arsenic-containing waste water to add 2-3 part sulfuric acid, 5-10 part pyrite cinder, 2-4 part ammoniacal liquor, 2-3 part sheet alkali and 5-8 part PAM flocculation agent successively, comprise the following steps:
(1) arsenic-containing waste water is entered collecting tank by sewage network, in pond, add sulfuric acid and pyrite cinder, after stirring, produce the mixed solution of sulfur acid iron ion;
(2) add proper ammonia, control PH, at 5-9, makes H+, Fe2+, Fe3+ complete reaction in solution, obtains ferric hydroxide precipitate;
(3) add sheet alkali, when pH value of sewage water brings up to 8-9, molysite soluble in water and ferrous salt are hydrolyzed generation two valency and trivalent ferric hydroxide colloid, and As2O3 generates the arsenic acid molysite of indissoluble with Fe (OH) 3 again;
(4) add PAM flocculation agent, stir, by de-steady, the bridge formation adsorption of flocculation agent, the particulate matter in cohesion water, suspended substance, and then water arsenic qualified discharge after precipitation or recycling.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510296446.8A CN104860445A (en) | 2015-06-03 | 2015-06-03 | Method for treating arsenic-containing wastewater by using pyrite cinder |
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| CN201510296446.8A CN104860445A (en) | 2015-06-03 | 2015-06-03 | Method for treating arsenic-containing wastewater by using pyrite cinder |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107324534A (en) * | 2017-07-17 | 2017-11-07 | 昆明理工大学 | A kind of method that utilization ferriferous oxide handles the waste acid containing arsenic |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1049487A (en) * | 1990-09-24 | 1991-02-27 | 吴玢 | Method for making polymerized ferric sulfate |
| CN104016455A (en) * | 2014-05-08 | 2014-09-03 | 上海丰信环保科技有限公司 | Method for treating arsenic-containing waste water |
-
2015
- 2015-06-03 CN CN201510296446.8A patent/CN104860445A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1049487A (en) * | 1990-09-24 | 1991-02-27 | 吴玢 | Method for making polymerized ferric sulfate |
| CN104016455A (en) * | 2014-05-08 | 2014-09-03 | 上海丰信环保科技有限公司 | Method for treating arsenic-containing waste water |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107324534A (en) * | 2017-07-17 | 2017-11-07 | 昆明理工大学 | A kind of method that utilization ferriferous oxide handles the waste acid containing arsenic |
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