CN109835974A - A method of utilizing lime treatment acid waste water - Google Patents
A method of utilizing lime treatment acid waste water Download PDFInfo
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- CN109835974A CN109835974A CN201711223261.XA CN201711223261A CN109835974A CN 109835974 A CN109835974 A CN 109835974A CN 201711223261 A CN201711223261 A CN 201711223261A CN 109835974 A CN109835974 A CN 109835974A
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- waste water
- lime
- acid
- acid waste
- milk
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Abstract
The present invention relates to the processing techniques of acid waste water, and in particular to utilizes the method in lime with raising lime utilization rate when acid waste water.It includes the following steps: that step 1 lime is configured to the milk of lime of content 20-50wt% with water；Step 2 imports acid waste water in milk of lime under the conditions of mechanical stirring and supersonic oscillations, detection, the pH value of clear liquid, when the pH value of clear liquid is 6.5-7.5, fills into milk of lime；Step 3 is separated by solid-liquid separation；Obtained solid is for metallurgy；Gained liquid is used for ore dressing.Lime utilization rate of the present invention is high, and compared with the prior art, its utilization rate at least improves 5% or more.
Description
Technical field
The present invention relates to the processing techniques of acid waste water, and in particular to utilizes in lime and improve when acid waste water lime benefit
With the method for rate.
Background technique
Metal mine is adopted, is selected, during smelting, and such as cave effluent of the acid waste water containing harmful components such as heavy metal, arsenic is often generated
Deng especially metal hydrometallurgy process often generates acid waste water largely containing high-concentration metallic ions.Such as the biology leaching of copper
Out-Extraction electrodeposition proposes copper process, generates the acid leaching solution of the substances such as a large amount of sulfur acids, copper, iron, aluminium, arsenic, leachate is through mentioning
It is recycled after taking copper therein, but with the accumulation of iron, acid in solution, will seriously affect extraction electrodeposition copper-extracting process, therefore
It to a large amount of extraction extraction raffinate open circuit outlets and to handle daily, generally use lime neutralisation at present and handle such waste water,
Major advantage is that simple process, ton cost of water treatment are cheap, but its disadvantage is also obvious: generating in N-process
The sediments such as calcium sulfate, calcium arsenate, metal hydroxides are easy to wrap up lime particle, neutralization reaction are blocked, so that lime be made to obtain
Less than making full use of, in addition, the slag inclusion waste water handled well is durings subsequent transfer, separation of solid and liquid etc., due to the lime of package
It slowly dissolves out, leads to pH value of solution and calcium ion raising, be difficult to control water outlet pH, equipment and transfer pipeline are easy fouling, block up
Plug, meanwhile, although lime neutralisation treatment acid waste water unit cost is more cheap, often water is big for acid wastewater in mine, always
Body cost is not cheap.
Summary of the invention
The purpose of the present invention is to provide a kind of high efficiency, the method using lime treatment acid waste water of low cost.
A kind of method using lime treatment acid waste water of the present invention；Include the following steps:
Step 1
Lime is configured to the milk of lime of content 20-50wt% with water；
Step 2
Under the conditions of mechanical stirring and supersonic oscillations, acid waste water is imported in milk of lime, detection, the pH value of clear liquid,
When the pH value of clear liquid is 6.5-7.5, milk of lime is filled into；
Step 3
It is separated by solid-liquid separation；Obtained solid is for metallurgy；Gained liquid is used for ore dressing.
The acid waste water is acid wastewater in mine.The acid wastewater in mine is that sulfuric acid, hydrofluoric acid or phosphoric acid acid are useless
Water, total acidity (total alkali consumption) >=15g/L that free acid and metal ion generate in waste water (with sulphur acid meter).
Ultrasonic frequency >=the 20kHz, ultrasonic wave generating device can be one or more, power density 0.2-20w/
Cm 2, the mode of action include but is not limited to inside or outside reactive tank, reaction mass supersonic zone hydraulic detention time >=
15min。
The reaction mass is 15-30min in the supersonic zone waterpower more preferably residence time.
The preferred scope of the ultrasonic frequency is 20-30kHz.
The preferred scope for the total acidity (total alkali consumption) that free acid and metal ion generate in waste water is 15-50g/L (with sulphur
Acid meter).
A kind of method lime utilization rate using lime treatment acid waste water of the present invention is more than or equal to 90%.
Specific embodiment
Example one:
Certain copper mine wet type copper smelting factory produces cathode using " bioleaching (dump leaching)-Extraction and back extraction-electrodeposition " technique
Copper, extraction extraction raffinate, which returns, to be leached, but with the accumulation of sulfuric acid, iron, aluminium, arsenic etc., seriously affects production technology, it is necessary to which open circuit is outer
Row, water quality are as follows: Fe7.72g/L, Al1.09g/L, SO42-35.23g/L, Zn0.15g/L, Cu0.1g/L, total alkali consumption (with
H2 SO4 meter) 33.45g/L.
The Conventional processing steps and effect of the waste water: taking waste water 50L, under mechanical agitation, with mass concentration 25%
Milk of lime be neutralized to pH7, reaction time 18min, the consumption content of free calcium oxide is the lime of 66.5% (mass concentration)
1.91kg, it is 75.2% that lime utilization rate, which can be calculated, from waste water total alkali consumption.
The operating procedure and effect of the embodiment of the present invention: taking waste water 50L, under identical mechanical agitation intensity, increases super
Sonication takes the milk of lime 5L of mass concentration 25%；It adds waste water into milk of lime, 23 ± 2KHz of ultrasonic frequency, power
Density 0.3w/cm 2, intermediate uninterruptedly to add milk of lime, control total reaction time is 18min, and the consumption content of free calcium oxide is
The lime 1.53kg of 66.5% (mass concentration), it is 93.8% that lime utilization rate, which can be calculated, from waste water total alkali consumption.
Claims (6)
1. a kind of method using lime treatment acid waste water；It is characterized in that；Include the following steps:
Step 1
Lime is configured to the milk of lime of content 20-50wt% with water；
Step 2
Under the conditions of mechanical stirring and supersonic oscillations, acid waste water is imported in milk of lime, detection, the pH value of clear liquid, when clear
When the pH value of liquid is 6.5-7.5, milk of lime is filled into；
Step 3
It is separated by solid-liquid separation；Obtained solid is for metallurgy；Gained liquid is used for ore dressing.
2. a kind of method using lime treatment acid waste water according to claim 1；It is characterized in that；The spent acidic
Water is acid wastewater in mine.
3. a kind of method using lime treatment acid waste water according to claim 2；It is characterized in that；The mine acid
Property waste water be sulfuric acid, hydrofluoric acid or phosphoric acid acid waste water, total acidity >=15g/L that free acid and metal ion generate in waste water.
4. a kind of method using lime treatment acid waste water according to claim 1；It is characterized in that；The ultrasound
Wave frequency rate >=20kHz, ultrasonic wave generating device can be one or more, power density 0.2-20w/cm 2, and the mode of action includes
But it is not limited to inside or outside reactive tank, reaction mass is in supersonic zone hydraulic detention time >=15min.
5. a kind of method using lime treatment acid waste water according to claim 1；It is characterized in that；The reactant
Material is 15-30min in the supersonic zone waterpower more preferably residence time.
6. a kind of method using lime treatment acid waste water according to claim 1；It is characterized in that；The ultrasound
The range of wave frequency rate is 20-30kHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711223261.XA CN109835974A (en) | 2017-11-29 | 2017-11-29 | A method of utilizing lime treatment acid waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711223261.XA CN109835974A (en) | 2017-11-29 | 2017-11-29 | A method of utilizing lime treatment acid waste water |
Publications (1)
| Publication Number | Publication Date |
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| CN109835974A true CN109835974A (en) | 2019-06-04 |
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| CN201711223261.XA Pending CN109835974A (en) | 2017-11-29 | 2017-11-29 | A method of utilizing lime treatment acid waste water |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112777708A (en) * | 2019-11-06 | 2021-05-11 | 江苏普源化工有限公司 | Treatment method of salicylic acid production wastewater |
| CN112777707A (en) * | 2019-11-06 | 2021-05-11 | 江苏普源化工有限公司 | Treatment method of wastewater containing sodium sulfate |
-
2017
- 2017-11-29 CN CN201711223261.XA patent/CN109835974A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112777708A (en) * | 2019-11-06 | 2021-05-11 | 江苏普源化工有限公司 | Treatment method of salicylic acid production wastewater |
| CN112777707A (en) * | 2019-11-06 | 2021-05-11 | 江苏普源化工有限公司 | Treatment method of wastewater containing sodium sulfate |
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Application publication date: 20190604 |