CN109502834B - Treatment method of mineral processing wastewater containing sodium dodecyl sulfate - Google Patents
Treatment method of mineral processing wastewater containing sodium dodecyl sulfate Download PDFInfo
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- CN109502834B CN109502834B CN201910018695.9A CN201910018695A CN109502834B CN 109502834 B CN109502834 B CN 109502834B CN 201910018695 A CN201910018695 A CN 201910018695A CN 109502834 B CN109502834 B CN 109502834B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/24—Treatment of water, waste water, or sewage by flotation
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/20—Heavy metals or heavy metal compounds
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- C02F2101/00—Nature of the contaminant
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- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
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- C02F2101/40—Organic compounds containing sulfur
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- C02F2103/10—Nature of the water, waste water, sewage or sludge to be treated from quarries or from mining activities
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2209/00—Controlling or monitoring parameters in water treatment
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Abstract
The invention relates to a treatment method of mineral processing wastewater containing sodium dodecyl sulfate, belonging to the field of industrial wastewater treatment and non-metal ore mineral processing. The invention provides a method for treating mineral processing wastewater containing sodium dodecyl sulfate, which comprises the following steps: after mineral dressing tailing ore pulp containing sodium dodecyl sulfate enters a thickener, a swirler for concentration or a filter press for filter pressing, the overflow part is added with Fe under the condition of not using conventional coagulation, oxidation and absorption medicaments for treatment2+The metal ion complex is formed with the sodium dodecyl sulfate in the water body, meanwhile, the overflow is guided into the micro-bubble flotation column, the foam containing the ion complex is generated through aeration flotation, the foam part is collected and recycled to the oxidized ore flotation operation through a foam scraper, the removal rate of organic agents such as the sodium dodecyl sulfate and the like in the underflow part is more than 85 percent, the water quality of the effluent reaches the requirement of the primary discharge standard of GB25466-2010 Integrated wastewater discharge Standard, and meanwhile, the cost of the beneficiation agents is reduced.
Description
Technical Field
The invention relates to the field of industrial water treatment and mineral processing, and particularly provides a method for treating mineral processing wastewater containing sodium dodecyl sulfate.
Background
Sodium Dodecyl Sulfate (SDS) is used as a common anionic surfactant, and is widely applied to the fields of washing, chemical engineering and the like due to the advantages of stable property, wide sources of preparation raw materials, low production cost and the like. In addition, SDS can be adsorbed in the electric double layer on the surface of part of easily-floated oxidized ore minerals through electrostatic force, has better selectivity and foaming performance, and is widely applied to the field of floatation of oxidized ore minerals such as barite, sylvite, fluorite, apatite and the like as a floatation collector in recent years.
Compared with other waste water, the beneficiation waste water has longer SDS molecular chain length and is easy to agglomerate with suspended particles in a water body, so that the water quality of the beneficiation waste water is seriously deteriorated, the CODcr value in the water body reaches more than thousands, if the beneficiation waste water is directly discharged, the mine environment is inevitably polluted, and if the beneficiation waste water is directly recycled to a crushing, grinding and flotation working section without being treated, the stability of the whole flotation production is interfered, the quality of flotation concentrate and the beneficiation index are influenced, so most beneficiation mines can treat the beneficiation waste water containing sodium dodecyl sulfate.
Currently, the main treatment method for industrial wastewater containing sodium dodecyl sulfate is TiO2Photocatalytic oxidative degradation, Fenton reagent catalytic oxidative degradation, ultrasonic degradation, traditional activated sludge degradation, biodegradation, flocculation, adsorption, coagulating sedimentation-air flotation and other processes are mostly applied to the treatment of chemical wastewater containing sodium dodecyl sulfate, and the processes are directly applied to the treatment of mineral processing wastewater containing sodium dodecyl sulfate, so that the problems of high treatment cost, complex operation procedure, large occupied area and the like exist, and the development of a water treatment method which can effectively reduce the organic matter residue of the wastewater and is economic and environment-friendly is urgently needed.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide the method for treating the beneficiation wastewater containing the sodium dodecyl sulfate, which can effectively reduce the content of the sodium dodecyl sulfate in the beneficiation wastewater and is economic and environment-friendly.
In order to solve the technical problems, the technical scheme of the invention is as follows:
a treatment method of mineral processing wastewater containing sodium dodecyl sulfate comprises the following steps:
s1, carrying out solid-liquid separation treatment on the beneficiation wastewater to obtain a to-be-treated liquid containing sodium dodecyl sulfate;
s2, adding Fe into the liquid to be treated obtained in S12+The reagent (2) is stirred, so that the sodium dodecyl sulfate in the liquid to be treated is converted into a metal ion complex;
s3, inflating the liquid to be treated processed in the S2 to obtain base liquid and a foam layer positioned on the surface layer of the base liquid;
s4, leading out the foam layer in the S3 for later use; the base solution can be directly discharged or enter the next treatment procedure.
Thus, after the beneficiation wastewater is subjected to solid-liquid separation treatment, a liquid to be treated with low solid content is obtained, then a medicament containing ferrous ions is added into the liquid to be treated, the ferrous ions are used as a metal ion complexing agent to fully work with sodium dodecyl sulfate in the treatment liquid to form a stable metal ion complex, then the gas is filled, and in the process of rising of bubbles, the metal ion complex is adsorbed in the bubbles due to strong hydrophobicity, a stable foam layer is formed on the liquid surface after a large number of micro bubbles are bonded, the foam layer can be easily led out to be separated from a bottom liquid, and the bottom liquid can be discharged into a tailing pond or other procedures, so that the beneficiation wastewater is efficiently treated at low cost; and the metal ion complex is enriched in the foam layer and can be conveyed to a flotation process, and under the weak acid condition, the metal ion complex can be decomposed to obtain sodium dodecyl sulfate for flotation operation, so that the addition amount of a collecting agent in the flotation process is reduced, and the trapping and recycling of the sodium dodecyl sulfate are realized. Meanwhile, the bottom liquid is used as the treated wastewater, most of organic matter residues in the water body are removed, the organic matter residues can be directly conveyed to a tailing pond, the water in the tailing pond can be used as water for mining and dressing industry in mine operation, and the full-cycle recycling of the mineral dressing wastewater is realized.
Further, the Fe content2+The addition amount of the chemical can be obtained by conversion according to the concentration of the sodium dodecyl sulfate in the liquid to be treated.
Further, in S1, the solid-liquid separation process includes at least one of a thickener thickening process, a cyclone classification process, and a filter pressing process of a filter press.
Further, in S2, the Fe content2+The agent comprises FeSO4、FeCl2、Fe(NO3)2At least one of them.
Further, in S2, the Fe content is first determined2+The medicament is prepared into a solution with the mass concentration of 1-5 percent, and then the solution is added into the liquid to be treated; the adding amount of the solution is 0.02-0.5% of the volume of the overflow water. Therefore, the medicament is added in a solution form, so that the medicament can be rapidly mixed with the liquid to be treated, and the reaction efficiency is improved.
Further, in S2, the stirring speed is 320-500 r/min, and the stirring time is 3-5 min.
Further, in S3, the bottom of the liquid to be treated is aerated.
Further, in S3, the liquid to be treated is aerated by the microbubble generator.
Further, in S3, the aeration rate is 0.02-0.05 m per cubic meter of the treatment liquid3/h。
Further, in S3, the thickness of the foam layer is 10-25 cm.
Further, after S4, the froth layer is returned to the flotation operation as additional water or rinse water for the flotation operation.
In some embodiments of the invention, the beneficiation wastewater containing sodium dodecyl sulfate is subjected to dehydration, the dehydration overflow or press filtration water is introduced into the mixing tank, and Fe is added into the mixing tank2+Fully working as a metal ion complexing agent and sodium dodecyl sulfate in a water body to form a stable metal ion complex, introducing an overflow part after reaction into a micro-bubble flotation column, generating stable bubbles by the flotation column through a micro-bubble generator, and generating Fe in the rising process of the bubbles from the bottom of the flotation column2+The complex formed with sodium dodecyl sulfate is adsorbed in the air bubble due to strong hydrophobicity, and a large amount of micro air bubbles are adhered and combined to form on the liquid surface of the flotation columnThe stable foam layer is formed, at the moment, a foam scraper of the flotation column is started, the foam layer is scraped out and conveyed to flotation operation through a pump, a large amount of metal ion complexes are contained in the foam layer and are led out to be conveyed into flotation pulp, the metal ion complexes are decomposed into sodium dodecyl sulfate under the weak acid condition, so that the addition amount of the sodium dodecyl sulfate serving as a collecting agent in the flotation process can be reduced, the trapping and recycling of the sodium dodecyl sulfate in the mineral processing wastewater are realized, meanwhile, the bottom flow of the flotation column is used as the treated mineral processing wastewater, most organic matter residues in the water body are removed and can be directly conveyed into a tailing pond, the water in the tailing pond can be used as water for mining and selecting industry, and the full recycling of the mineral processing wastewater is realized.
The treatment method of the invention is obviously superior to the existing TiO treatment method for industrial wastewater containing sodium dodecyl sulfate2Photocatalytic oxidative degradation, Fenton reagent catalytic oxidative degradation, ultrasonic degradation, flocculation, adsorption, coagulating sedimentation-air flotation and other treatment processes.
Compared with the prior art, the invention has the following beneficial effects:
(1) the invention does not need to build special infrastructures such as a coagulating sedimentation tank, a reaction tank, an aeration tank, a clean water tank and the like, thereby greatly reducing the investment and the occupied area of the infrastructures and greatly reducing the cost;
(2) the method not only treats the beneficiation wastewater, realizes effective removal of organic matters in the wastewater, greatly reduces CODcr of the beneficiation wastewater, and is efficient and environment-friendly; meanwhile, sodium dodecyl sulfate in the wastewater is collected again, and the collected sodium dodecyl sulfate can be recycled to the flotation operation sections of barite, fluorite, sylvite and the like to be used as the supplement of a collecting agent, so that the using amount of the sodium dodecyl sulfate in normal flotation operation is reduced, and the reagent cost in the beneficiation process is reduced.
Drawings
FIG. 1 is a process flow diagram of a first embodiment of the present invention.
Detailed Description
The present invention will be described in detail with reference to examples.
Example of embodiment 1
The lead-zinc-sulfur heavy spar polymetallic ore in Guangxi is only 1000m away from Qianjiang, is a large ore dressing plant for daily mining and dressing ore 2300t/d, and the daily produced wastewater is about 9400m3The beneficiation process flow comprises lead preferential flotation, activation zinc flotation, desulfurization flotation and barite flotation, wherein about 200g/t of sodium dodecyl sulfate of ore is added in the barite flotation to serve as a collector of barite ore, after the barite tailings are classified by a cyclone, classification overflow containing the sodium dodecyl sulfate is beneficiation wastewater, and the water quality analysis condition of the wastewater is shown in table 1.
TABLE 1 beneficiation wastewater quality
The beneficiation wastewater is treated according to the process flow shown in the attached figure 1, firstly, the beneficiation wastewater containing sodium dodecyl sulfate is subjected to solid-liquid separation operation through a thickener 1, most of the sodium dodecyl sulfate exists in an overflow part, and an underflow part enters filling operation or dry-stacking operation;
the overflow part is sent into a stirring barrel 2, and FeSO is added4Forming an ionic complex with sodium dodecyl sulfate, and rapidly mechanically stirring at a rotating speed of 320-500 r/min for 3-5 min; wherein 80g of ferrous sulfate is added to the overflow part generated by processing one ton of ore;
the effluent of the stirring barrel is automatically led into a micro-bubble flotation column 3, and simultaneously, the bottom of the flotation column is aerated through a micro-bubble generator of the flotation column, wherein the aeration air quantity is 0.05m3/h；
Carrying out hydrophobic adhesion on bubbles in the flotation column and an ionic complex and floating to the surface layer of the water surface to form a stable foam layer with the thickness of 10-25 cm, simultaneously starting a bubble scraper of the flotation column, leading out the foam layer, and conveying the foam layer to flotation operation through a pump 4 to be used as additional water or flushing water in the flotation operation;
the quality of the treated beneficiation wastewater is shown in table 2.
TABLE 2 Water quality of treated mineral processing wastewater
The quality of the treated effluent at the bottom of the flotation column reaches the first-level discharge standard requirement of GB25466-2010 Integrated wastewater discharge Standard, and meanwhile, after the foam layer returns to the barite flotation operation, the using amount of the sodium dodecyl sulfate can be reduced to 170-185 g/t under the stable production condition, the reduction range can reach 15%, the medicament cost is effectively reduced, and meanwhile, the harmless treatment of the mineral processing wastewater is realized.
The foregoing examples are set forth to illustrate the present invention more clearly and are not to be construed as limiting the scope of the invention, which is defined in the appended claims to which the invention pertains, as modified in all equivalent forms, by those skilled in the art after reading the present invention.
Claims (8)
1. The method for treating the mineral processing wastewater containing the sodium dodecyl sulfate is characterized by comprising the following steps of:
s1, carrying out solid-liquid separation treatment on the beneficiation wastewater to obtain a to-be-treated liquid containing sodium dodecyl sulfate;
s2, adding Fe into the liquid to be treated obtained in S12+The reagent (2) is stirred, so that the sodium dodecyl sulfate in the liquid to be treated is converted into a metal ion complex;
wherein the stirring speed is 320-500 r/min, and the stirring time is 3-5 min;
s3, inflating the liquid to be treated processed in the S2 to obtain base liquid and a foam layer positioned on the surface layer of the base liquid;
s4, leading out the foam layer in the S3 for later use; the base solution can be directly discharged or enter the next treatment procedure.
2. The method for treating beneficiation wastewater containing sodium dodecyl sulfate according to claim 1, characterized in that: s1, the solid-liquid separation treatment process comprises at least one of thickener thickening treatment, cyclone classification treatment and filter pressing treatment of a filter press.
3. The method for treating beneficiation wastewater containing sodium dodecyl sulfate according to claim 1, characterized in that: s2, the Fe content2+The agent comprises FeSO4、FeCl2、Fe(NO3)2At least one of them.
4. The method for treating beneficiation wastewater containing sodium dodecyl sulfate according to claim 1, characterized in that: in S2, the Fe content is firstly2+The preparation is prepared into a solution with the mass concentration of 1-5%, and then the solution is added into a liquid to be treated; the adding amount of the solution is 0.02-0.5% of the volume of the overflow water.
5. The method for treating beneficiation wastewater containing sodium dodecyl sulfate according to claim 1, characterized in that: in S3, the liquid to be treated is aerated by the microbubble generator.
6. The method for treating beneficiation wastewater containing sodium dodecyl sulfate according to claim 1, characterized in that: in S3, the aeration rate is 0.02-0.05 m per cubic meter of the treatment liquid3/h。
7. The method for treating beneficiation wastewater containing sodium dodecyl sulfate according to claim 1, characterized in that: in S3, the thickness of the foam layer is 10-25 cm.
8. The method for treating beneficiation wastewater containing sodium dodecyl sulfate according to any one of claims 1 to 7, wherein: after S4, the froth layer is returned to the flotation operation as additional water or rinse water in the flotation operation.
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| CN112718255B (en) * | 2020-12-08 | 2021-12-14 | 中南大学 | Method for degrading mineral surface flotation reagent through electrochemical oxidation |
| CN113087200A (en) * | 2021-03-15 | 2021-07-09 | 天津科技大学 | Method for removing heavy metal ions in water body |
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| CN103723783A (en) * | 2013-11-28 | 2014-04-16 | 瓮福（集团）有限责任公司 | Method for recovering flotation reagents from phosphorite mineral processing wastewater |
| CN107683260A (en) * | 2015-06-22 | 2018-02-09 | 科诺科菲利浦公司 | Surfactant is removed from production water |
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| CN103723783A (en) * | 2013-11-28 | 2014-04-16 | 瓮福（集团）有限责任公司 | Method for recovering flotation reagents from phosphorite mineral processing wastewater |
| CN107683260A (en) * | 2015-06-22 | 2018-02-09 | 科诺科菲利浦公司 | Surfactant is removed from production water |
| CN107935236A (en) * | 2017-11-21 | 2018-04-20 | 四川理工学院 | A kind of method of the processing containing surface active agent wastewater |
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