A treatment process and system for colored polymetallic ore dressing wastewater

Abstract

The invention discloses a treatment process and a treatment system for colored multi-metal beneficiation wastewater, comprising the steps of adding composite iron salt to the beneficiation wastewater before entering a tailings pond, and entering a homogenizing tank of a wastewater station after precipitation and filtration; the wastewater flowing out of the homogenizing tank of the wastewater station enters a No. 1 medium-speed reaction tank, and a quantitative water purification flocculant YD-01 is added; the wastewater flowing out of the No. 1 medium-speed reaction tank enters a No. 2 rapid reaction tank, and a quantitative decolorizing flocculant YD-02 is added; the wastewater flowing out of the No. 2 rapid reaction tank enters a No. 3 slow reaction tank, and a quantitative decolorizing flocculant YD-03 is added; and a mixture of flocs and water after mud and water separation enters a sedimentation tank, and is rapidly precipitated and clarified. The present invention provides a colored multi-metallic ore dressing wastewater treatment system and treatment process. Through the action of a decolorizing flocculant, the chroma of the reddish ore dressing wastewater can be reduced by about 60%, and the use of a decolorizing flocculant combination scheme can ensure that the effluent water quality is stable and controllable; in addition, the cost per ton of water is about 0.3-0.5 yuan / ton, and the cost is significantly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of industrial wastewater treatment, and more particularly to a treatment process and system for colored multi-metallic ore dressing wastewater. Background Art

[0002] Wastewater in the mining process mainly comes from three stages: ore washing, crushing and separation. The ore separation process mainly includes gravity separation, flotation and magnetic separation. According to statistics, it takes 4 to 7 m3 of water to process 1 ton of ore by flotation. 3 The gravity separation method requires 20 to 26 m3 of water. 3 The flotation-magnetic separation method requires 23 to 27 m3 of water. 3 The gravity separation-flotation method requires 20 to 30 m3 of water. 3 . Excluding the recycled water, most of the consumed water flows out of the beneficiation plant in the form of tailings slurry along with the tailings. The indicators of heavy metal ions, suspended solids concentration and chemical oxygen demand in the beneficiation wastewater exceed the national "Comprehensive Wastewater Discharge Standard (GB8978-1996)". Direct discharge seriously affects the quality of surrounding water bodies; direct reuse without purification will seriously affect the stability of production and the technical indicators of the flotation beneficiation process.

[0003] Due to the high content of suspended solids in mineral processing wastewater, the many types of flotation agents with high concentrations, and the many types of heavy metals with high toxicity, if the mineral processing wastewater is directly discharged into natural water bodies, it will inevitably cause serious pollution to the water environment and bring serious potential hazards to human production and life.

[0004] At present, the commonly used mineral processing wastewater treatment process is generally to add lime milk to the wastewater, and then send the wastewater and tailings to the tailings pond together. This treatment process has the characteristics of simple process, convenient management, reliable operation, low cost, and easy availability of raw materials (quicklime), and is widely used in China. However, the associated minerals and occurrence characteristics of different non-ferrous metal ores are different, and the use of different mineral processing processes and mineral processing reagent systems results in a large difference in mineral processing wastewater treatment. In the multi-metal flotation operation, the residual water glass and other flotation reagents make it difficult to flocculate and clarify the ore dressing wastewater efficiently, and the effluent cannot meet the reuse requirements. In addition, after the multi-metal ore dressing tailings are treated with composite iron salts (a benzoic acid hydroxamic acid in the ore dressing reagent forms a purple-red complex with iron ions), the effluent becomes turbid and purple-red after treatment, which seriously affects the appearance of the effluent. The oxidant has few destabilizing components and the amount of polymer flocculant added is too little, resulting in poor destabilization effect, water turbidity, color, and suspended solids are not completely removed, and the effluent appearance is not good. Due to the high unit price of the oxidant, the overall cost per ton of water and ton of ore is high. In addition, the ore dressing wastewater contains some difficult-to-degrade organic reagents. The incomplete removal of water glass and organic reagents in the wastewater affects the ore dressing indicators, making it difficult to reuse the wastewater.

[0005] Therefore, how to provide a multi-metallic mineral processing wastewater treatment system and treatment and recovery method that can save costs and improve water quality is an urgent problem that technical personnel in this field need to solve. Summary of the invention

[0006] The purpose of the present invention is to provide a treatment process and a treatment system for colored multi-metallic ore dressing wastewater in view of the deficiencies in the prior art. Through the action of a decolorizing flocculant, the chroma of the reddish ore dressing wastewater can be reduced by about 60%, and the use of a decolorizing flocculant combination scheme can ensure that the effluent water quality is stable and controllable; in addition, the cost per ton of water is about 0.3-0.5 yuan / ton, which is significantly lower than the cost of an oxidant.

[0007] In order to achieve the above object, the present invention adopts the following technical solution:

[0008] A process for treating colored polymetallic ore dressing wastewater, characterized in that it comprises the following steps:

[0009] S1. Before the wastewater from the concentrator enters the tailings pond, composite iron salt is added, and after sedimentation and filtration, it enters the homogenization tank of the wastewater station;

[0010] S2. By adjusting the two gates, the water inflow of the two lines is basically balanced; specifically, after the homogenization tank of the wastewater station, it is divided into two 10,000 cubic meters / aerial lines, including two groups of medium, fast and slow reaction tanks, and two 800 cubic meter sedimentation tanks.

[0011] S3, the wastewater flowing out of the homogenization tank of the wastewater station enters the No. 1 medium-speed reaction tank, and a quantitative water purification flocculant YD-01 is added, the stirring rate is 65-80r / min, and the stirring is carried out for 2-5 minutes to destabilize and produce small alum flowers;

[0012] S4, the wastewater from the No. 1 medium-speed reaction tank enters the No. 2 fast reaction tank, and a quantitative decolorizing flocculant YD-02 is added, and the stirring rate is 110-120r / min. After stirring for 2-5 minutes, it combines with the small alum flowers produced by destabilization to form flocculation nuclei, and at the same time, ions are exchanged and adsorbed to part of the mineral processing reagents;

[0013] S5. The wastewater from the No. 2 fast reaction tank enters the No. 3 slow reaction tank, and a quantitative decolorizing flocculant YD-03 is added. The stirring rate is 17-25r / min. After stirring for 2-10 minutes, the small alum flowers produced by destabilization are combined to form large flocs. The large alum flowers collide with each other to absorb smaller and finer colloidal particles in the water, achieving the purpose of mud and water separation;

[0014] S6. After the separation of mud and water, the flocs and water mixture enter the sedimentation tank and quickly settle and clarify.

[0015] Preferably, the main component of the water purification flocculant YD-01 is a composite aluminum-iron salt coagulant, with a relative density at 20°C ≥1.19, an aluminum oxide content ≥9.0%, a trivalent iron content ≤1.0%, a basicity of 45.0%-85.0%, a water-insoluble matter content ≤0.5%, a pH value of 1% aqueous solution of 3.5-5.0, an arsenic content ≤5 mg / L, a manganese content ≤25 mg / L, a hexavalent chromium content ≤10 mg / L, and a mercury content ≤0.2 mg / L.

[0016] The above technical solution can achieve rapid destabilization and transform the soluble colloidal substances into small alum flowers, which is beneficial for further removal.

[0017] Preferably, the main component of the decolorizing flocculant YD-02 is an activated mineral with ion exchange and the ability to adsorb the color-developing group of the mineral processing agent, mainly in the form of small alum flowers, with a mass fraction of free acid calculated as H2SO4 ≤ 0.50%, and an activity ≥ 190H + mmol / Kg, mass fraction of water ≤13%, fineness ≥200 mesh, bulk density 0.55±0.10g / mL, pH of 50g / L suspension 2.2-4.8, heavy metal content in terms of Pb ≤40mg / kg, arsenic content ≤3mg / kg.

[0018] By adopting the above technical scheme, the activated minerals are formed into compact flocs, providing flocculation nuclei, and at the same time adsorbing colored groups in the wastewater through electrostatic and ion exchange.

[0019] Preferably, the main component of the decolorizing flocculant YD-03 is a high molecular flocculant with a solid content of ≥90%, a molecular weight of 5 million to 12 million, and an ionicity of 5% to 80%.

[0020] The above technical solution is mainly used to make the suspended matter undergo electrical neutralization, bridging adsorption and flocculation to achieve the purpose of mud-water separation.

[0021] Preferably, the multi-metal ore dressing wastewater includes at least two combinations of tungsten dressing wastewater, bismuth dressing wastewater, molybdenum dressing wastewater, fluorite dressing wastewater, and lead and zinc dressing wastewater.

[0022] Preferably, the COD of the tailings supernatant before step S1 is 120-160 mg / L, and the pH is 8.5-9.0; the COD of the water after treatment in step S1 is 40-70 mg / L, the pH is 7.2-7.6, the chroma is 40-60 times, and the turbidity is 20-40 mg / L; the COD of the water after treatment in steps S2-S6 is 30-50 mg / L, the pH is 6.9-7.2, the chroma is 15-17 times, and the turbidity is 0-15 mg / L.

[0023] Preferably, the dosage of the water purification flocculant YD-01 is 0.0001-0.00015M 3 / M 3 The dosage of the decolorizing flocculant YD-02 is 0.0008-0.0001 tons / M 3 The dosage of the water purification flocculant YD-03 is 0.0000008-0.000001 tons / M 3 .

[0024] In the above technical scheme, when the colored polymetallic mineral processing wastewater is high turbidity water, only the water purification flocculant YD-01 and the decolorization flocculant YD-03 are used; when the colored polymetallic mineral processing wastewater is low turbidity and high chroma water, the dosage of the decolorization flocculant YD-02 is increased.

[0025] The present invention also provides a treatment system for the above-mentioned colored multi-metallic ore dressing wastewater treatment process, including tailings wastewater from the dressing plant, a tailings reservoir, a wastewater homogenization tank, a sedimentation tank, a reaction system, an external pasteurization tank, and a reagent storage tank;

[0026] The reaction system comprises a No. 1 medium-speed reaction pool, a No. 2 fast reaction pool, and a No. 3 slow reaction pool;

[0027] The reagent storage tanks include a composite iron salt storage tank, a water purification flocculant YD-01 storage tank, a decolorization flocculant YD-02 storage tank, and a decolorization flocculant YD-03 storage tank;

[0028] The tailings wastewater pool of the concentrator is connected in sequence to the tailings pond, the homogenizing pool of the wastewater station, the medium-speed reaction pool No. 1, the rapid reaction pool No. 2, the slow reaction pool No. 3, the sedimentation pool, and the external pasteurization pool; the drug outlet of the composite iron salt storage tank is added at the entrance of the unloading box where the tailings wastewater of the concentrator enters the storage, the drug outlet of the water purification flocculant YD-01 storage tank is dripped on the surface of the medium-speed reaction pool No. 1, the drug outlet of the decolorization flocculant YD-02 storage tank is dripped on the surface of the rapid reaction pool No. 2, and the drug outlet of the decolorization flocculant YD-03 storage tank is dripped on the surface of the slow reaction pool No. 3.

[0029] Preferably, it also includes a stirring device, which is respectively installed at the bottom of the No. 1 medium-speed reaction tank, the No. 2 fast reaction tank and the No. 3 slow reaction tank.

[0030] It can be seen from the above technical solutions that, compared with the prior art, the present invention discloses a treatment process and a treatment system for colored multi-metallic ore dressing wastewater, which has the following technical effects:

[0031] (1) The treatment process of colored multi-metallic ore dressing wastewater provided by the present invention can reduce the purple-red color of the wastewater after the temperature rises after the composite iron salt is treated with tailings through the action of decolorizing flocculants; the decolorizing flocculation combination scheme has three agents used in combination, and only YD-01 and YD-03 can be used for high turbidity influent, and YD-02 type agent can be added for low turbidity and high chromaticity influent.

[0032] (2) The main component of the oxidant in the prior art is sodium chlorate, which has no effect on COD degradation at room temperature, and has few destabilizing components. The dosage of the polymer flocculant is too small, so it has no obvious effect on the turbidity, color and suspended matter of the effluent. It mainly uses the natural sedimentation of the sedimentation tank. The colored multi-metal ore dressing wastewater treatment system provided by the utility model uses a decolorization and flocculation combination scheme to ensure that the effluent water quality is stable and controllable.

[0033] (3) The prior art uses oxidants, but due to their high unit price, the overall cost per ton of water and per ton of ore is high. The colored multi-metal ore dressing wastewater treatment process provided by the present invention uses a decolorization and flocculation combination solution to ensure stable effluent quality. The cost per ton of water is about 0.3-0.5 yuan / ton, which is significantly lower than the cost of oxidants. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0035] Figure 1 The accompanying drawing is a schematic diagram of the overall structure of an embodiment of the present invention.

[0036] Figure 2 The attached figure is a comparison chart of SS removal rates of the examples of the present invention and the comparative examples.

[0037] Figure 3 The accompanying drawing is a comparison diagram of the chroma removal rates of the embodiments of the present invention and the comparative examples.

[0038] Figure 4 The accompanying drawing is a comparison diagram of turbidity removal rates of the embodiments of the present invention and the comparative examples.

[0039] Figure 5 The accompanying drawing is a comparison diagram of COD removal rates of the embodiments of the present invention and the comparative examples. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Example 1

[0042] This embodiment provides a treatment system for colored multi-metallic ore dressing wastewater, such as Figure 1 As shown, it includes the tailings wastewater pool of the dressing plant, the tailings reservoir, the homogenization pool of the wastewater station, the No. 1 medium-speed reaction pool, the No. 2 fast reaction pool, the No. 3 slow reaction pool, the sedimentation pool, and the external pasteurization pool connected in sequence; the reagent storage tanks include the composite iron salt storage tank, the water purification flocculant YD-01 storage tank, the decolorization flocculant YD-02 storage tank, and the decolorization flocculant YD-03 storage tank;

[0043] The tailings wastewater pool of the concentrator is connected in sequence to the tailings pond, the homogenization pool of the wastewater station, the No. 1 medium-speed reaction pool, the No. 2 rapid reaction pool, the No. 3 slow reaction pool, the sedimentation pool, and the external pasteurization pool; the drug outlet of the composite iron salt storage tank is added at the entrance of the unloading box where the tailings wastewater of the concentrator enters the pool, the drug outlet of the water purification flocculant YD-01 storage tank is dripped on the surface of the No. 1 medium-speed reaction pool, the drug outlet of the decolorization flocculant YD-02 storage tank is dripped on the surface of the No. 2 rapid reaction pool, and the drug outlet of the decolorization flocculant YD-03 storage tank is dripped on the surface of the No. 3 slow reaction pool.

[0044] In order to further optimize the above technical solution, a stirring device is also included, which is respectively installed at the bottom of the No. 1 medium-speed reaction tank, the No. 2 fast reaction tank and the No. 3 slow reaction tank.

[0045] In order to further optimize the above technical scheme, the main component of the water purification flocculant YD-01 is a composite aluminum-iron salt coagulant, with a relative density of ≥1.19 at 20°C, an aluminum oxide content of ≥9.0%, a trivalent iron content of ≤1.0%, a basicity of 45.0%-85.0%, a water-insoluble content of ≤0.5%, a pH value of 1% aqueous solution of 3.5-5.0, an arsenic content of ≤5mg / L, a manganese content of ≤25mg / L, a hexavalent chromium content of ≤10mg / L, and a mercury content of ≤0.2mg / L. It can quickly destabilize and turn soluble colloidal substances into small alum flowers, which is conducive to further removal.

[0046] In order to further optimize the above technical solution, the main component of the decolorizing flocculant YD-02 is an activated mineral with ion exchange and the ability to adsorb the color-developing group of the mineral processing agent, mainly in the form of small alum flowers, with a mass fraction of free acid calculated as H2SO4 ≤0.50%, and an activity ≥190H +mmol / Kg, the mass fraction of water ≤13%, the fineness ≥200 mesh, the bulk density is 0.55±0.10g / mL, the pH of 50g / L suspension is 2.2-4.8, the heavy metal content in terms of Pb is ≤40mg / kg, the arsenic content is ≤3mg / kg, it forms tight flocs to provide flocculation nuclei, and at the same time adsorbs colored groups in wastewater through electrostatic and ion exchange.

[0047] In order to further optimize the above technical solution, the main component of the decolorizing flocculant YD-03 is a high molecular flocculant with a solid content of ≥90%, a molecular weight of 5 million to 12 million, and an ionicity of 5% to 80%. It mainly neutralizes the suspended matter through electrical bonding, adsorption by bridges, and flocculation to achieve the purpose of mud-water separation.

[0048] In order to further optimize the above technical scheme, the multi-metal mineral processing wastewater includes at least two combinations of tungsten processing wastewater, bismuth processing wastewater, molybdenum processing wastewater, fluorite processing wastewater, and lead and zinc processing wastewater.

[0049] Example 2

[0050] The main component of the water purification flocculant YD-01 used in this embodiment is a composite aluminum iron salt coagulant, and the specific physical properties are shown in the following table:

[0051] project index Relative density (20℃) ≥1.19 <![CDATA[Aluminum Oxide (Al2O3) %]]> ≥9.0 <![CDATA[Ferric iron (Fe 3+ )%]]> ≤1.0 Basicity % 45.0-85.0 Water insoluble matter% ≤0.5 pH (1% aqueous solution) 3.5-5.0 Arsenic (As) content ≤5mg / l Manganese (Mn) content ≤25mg / l <![CDATA[Hexavalent chromium (Cr 6+ ) content]]> ≤10mg / l Mercury (Hg) content ≤0.2mg / l

[0052] The main component of the decolorizing flocculant YD-02 used in this example is an activated mineral with ion exchange and the ability to adsorb the color-developing group of the mineral processing agent. The specific physical properties are shown in the following table:

[0053] project index <![CDATA[Free acid (calculated as H2SO4), w / %]]> ≤0.50 Activity, H+mmol / Kg ≥190 Moisture, w / % ≤13.0 Fineness(mesh) ≥200 Bulk density, g / mL 0.55±0.10 pH(50g / L suspension) 2.2～4.8 Heavy metal (in terms of Pb) / (mg / kg) ≤40 Arsenic (As) / (mg / kg) ≤3

[0054] The main component of the decolorizing flocculant YD-03 used in this embodiment is a polymer flocculant, and its specific physical properties are shown in the following table:

[0055] project index Solid content (%) 90％ Molecular weight (ten thousand) 500-1200 Degree of hydrolysis (%) Ionic degree 5-80

[0056] This embodiment provides a treatment process for colored multi-metallic ore dressing wastewater, comprising the following steps:

[0057] S1. Add composite iron salt to the wastewater before it enters the tailings pond, with a dosage of 0.00015t / m 3 , at a stirring speed of 75r / min, after stirring for 3.5 minutes, add composite iron salt to allow the heavy metal ions in the wastewater to enter the ferrite lattice under the wrapping and entrainment of the ferrite to form composite ferrite, and then remove various heavy metal ions through solid-liquid separation, and enter the homogenization tank of the wastewater station after precipitation and filtration;

[0058] S2, the wastewater homogenization tank is used to adjust the inlet and outlet flow, and the water inflow of the two lines is basically balanced by adjusting the two gates;

[0059] S3, the wastewater flowing out of the homogenization tank of the wastewater station enters the No. 1 medium-speed reaction tank, and a quantitative water purification flocculant YD-01 is added, with a dosage of 0.00012M 3 / M 3 , water purification flocculant YD-01 is a coagulant specially developed for mineral processing wastewater. Its main component is composite aluminum iron salt coagulant, which mainly plays a destabilizing role. When the stirring rate is 80r / min, after stirring for 3.5 minutes, destabilization produces small alum flowers;

[0060] S4. The wastewater from the No. 1 medium-speed reaction tank flows into the No. 2 fast reaction tank, and a quantitative decolorizing flocculant YD-02 is added at a dosage of 0.00008 tons / M 3 The decolorizing flocculant YD-02 is specially developed for mineral processing wastewater. Its main component is activated minerals with ion exchange and the ability to adsorb the color-developing groups of mineral processing reagents. At a stirring rate of 120r / min, after stirring for 3.5 minutes, it combines with the small alum flowers produced by destabilization to form flocculation nuclei, and at the same time, ion exchange and adsorption of part of the mineral processing reagents;

[0061] S5. The wastewater from the No. 2 fast reaction tank flows into the No. 3 slow reaction tank, and a quantitative decolorizing flocculant YD-03 is added at a dosage of 0.00008 tons / M 3 The decolorizing flocculant YD-03 is specially developed for mineral processing wastewater. Its main component is polymer flocculant. When the stirring rate is 20r / min and the stirring time is 5 minutes, it combines with the small alum flowers produced by destabilization to form large flocs. The large alum flowers collide with each other to absorb smaller and finer colloidal particles in the water, thus achieving the purpose of mud-water separation.

[0062] S6. After the separation of mud and water, the flocs and water mixture enter the sedimentation tank and quickly settle and clarify. The effluent is sampled regularly for water quality monitoring data.

[0063] In order to further optimize the technical solution, when the colored multi-metallic mineral processing wastewater is highly turbid water, only water purification flocculant YD-01 and decolorization flocculant YD-03 are used.

[0064] In order to further optimize the technical solution, when the colored multi-metallic mineral processing wastewater is low turbidity and high chroma water, the dosage of decolorizing flocculant YD-02 is increased.

[0065] Comparative Example

[0066] This comparative example provides a method for treating and recovering wastewater from a mine. The specific treatment and recovery method includes: adding composite iron salt to the tailings wastewater pool of the concentrator, and the wastewater enters the tailings pond; after the above-mentioned sedimentation and filtration, it enters the homogenization pool of the wastewater station, and the water inflow of the two lines is basically balanced by adjusting two gates; the wastewater flowing out of the homogenization pool of the wastewater station enters the No. 1 medium-speed reaction pool, and a quantitative oxidant is added, and the addition amount is 0.0001M 3 / M, the main component of the oxidant is sodium chlorate, and the stirring speed is 75r / min. After stirring for 3.5 minutes, small alum flowers are steadily produced; the wastewater flowing out of the No. 1 medium-speed reaction tank enters the No. 2 fast reaction tank; before the wastewater flowing out of the No. 2 fast reaction tank enters the No. 3 slow reaction tank, a quantitative polymer flocculant is added, and the addition amount is 0.000001 tons / M 3 At a stirring speed of 20r / min, after stirring for 10 minutes, flocculation reaction is carried out to achieve the purpose of mud and water separation; after the mud and water separation, the flocs and water mixture enter the sedimentation tank and quickly settle and clarify, and the effluent is sampled regularly for water quality monitoring data.

[0067] Hunan Shizhuyuan Polymetallic Co., Ltd. Matan Wastewater Station: The pollutants in the mineral processing wastewater mainly include suspended solids, acid and alkali, chromaticity, turbidity, chemical oxygen-consuming substances and some heavy metals. The discharge or loss of mineral processing wastewater without treatment will seriously pollute water sources and soil, harm aquatic products and plants, and silt up rivers and lakes. Therefore, it is very important to choose a suitable treatment method to remove pollutants in mineral processing wastewater.

[0068] The above-mentioned mineral processing wastewater was treated and recovered using Example 2 and the comparative example respectively. The following is a summary table of water quality analysis data during the industrial trial from April 14, 2020 to April 26, 2020, as shown in Table 1, wherein Line 1 is the comparative example treatment process and the water quality monitoring data of the reagent effluent, and Line 2 is the treatment process of Example 2 and the water quality detection data of the reagent effluent.

[0069] Table 1 Summary of water quality analysis data during industrial trial period

[0070]

[0071]

[0072] Note: The above data are true and reliable, as the water samples were taken during the industrial trial and tested by the Quality Inspection Center of Hunan Shizhuyuan Nonferrous Metals Co., Ltd.

[0073] The following will conduct relevant data analysis and comparison on the water quality analysis data during the industrial trial period.

[0074] (1) Comparison of odors of mineral processing agents

[0075] Through data comparison and analysis, the water quality indicators of the effluent from Line II are all better than the raw water quality of the production water taken from the river. In addition, the effluent from Line II has no odor of mineral processing agents, while the mud has a strong odor of mineral processing agents. The effluent from Line I has a odor of mineral processing agents. Therefore, Line II meets or even exceeds the raw water standards for production and can achieve the purpose of reuse.

[0076] (2) Comparison of SS removal rate (i.e., comparison of suspended solids removal rate)

[0077] By attaching Figure 2 From the data in (SS removal rate comparison chart), it can be seen that the SS removal rate of Line I is between 28% and 80%, and the SS removal rate of Line II is between 78% and 95%. It can be seen that the lowest SS removal rate of Line II almost reaches the highest SS removal rate of Line I. Obviously, using the colored multi-metal mineral processing wastewater treatment process provided by the present invention to treat wastewater can significantly and stably improve water quality.

[0078] (3) Comparison of chroma removal rate

[0079] By attaching Figure 3 From the data in (Comparison of Chroma Removal Rate), it can be seen that the chroma removal rate of Line I is between 18% and 70%, and the chroma removal rate of Line II is between 40% and 75%. It can be seen that the use of the colored multi-metal mineral processing wastewater treatment process provided by the present invention to treat wastewater has an obvious and stable decolorization effect.

[0080] (4) Comparison of turbidity removal capacity

[0081] By attaching Figure 4 From the data in (Turbidity Removal Comparison Chart), it can be seen that the turbidity removal rate of Line I is between 24% and 63%, and the turbidity removal rate of Line II is between 64% and 95%, among which the lowest turbidity removal rate of Line II is higher than the highest turbidity removal rate of Line I. It can be seen that the colored multi-metal mineral processing wastewater treatment process provided by the present invention has an obvious and stable decolorization effect on the wastewater, and can ensure the appearance of the effluent.

[0082] (5) Comparison of COD removal rate

[0083] By attaching Figure 5From the data in (COD removal rate comparison chart), it can be seen that COD (chemical oxygen demand) is a comprehensive indicator of the relative content of organic matter. The COD removal rate of Line I is between 25% and 40%, and the COD removal rate of Line II is between 8% and 40%. Line I uses an oxidant, and the main function of its effective ingredient is to reduce COD. The combined agent used in Line II has a mechanism of "destabilization-adsorption ion exchange-flocculation precipitation", and its main purpose is to improve the water quality perception, because it can adsorb part of the mineral processing agents, thereby synergistically removing COD. Although the colored multi-metal mineral processing wastewater treatment process provided by the present invention does not use an oxidant when treating wastewater, it still has the ability to remove COD while saving costs.

[0084] In summary, the present invention provides a colored multi-metallic mineral processing wastewater treatment system, which can reduce the chroma of the red mineral processing wastewater by about 60% through the action of a decolorizing flocculant, and the use of a decolorizing flocculant combination scheme (i.e., a combination of a water purification flocculant YD-01, a decolorizing flocculant YD-02, and a decolorizing flocculant YD-03) can ensure that the effluent water quality is stable and controllable; in addition, the cost per ton of water is about 0.3-0.5 yuan / ton, which is significantly lower than the cost of an oxidant.

[0085] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the method part.

[0086] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A process for treating colored polymetallic ore dressing wastewater, characterized in that: The following steps are involved: S1. Before the ore dressing wastewater enters the tailings pond, composite iron salt is added, and after sedimentation and filtration, it enters the homogenization tank of the wastewater station; S2, balance the water inflow into the two lines by adjusting the two gates; S3, the wastewater flowing out of the homogenization tank of the wastewater station enters the No. 1 medium-speed reaction tank, and a quantitative water purification flocculant YD-01 is added, the stirring rate is 65-80r / min, and the stirring is carried out for 2-5 minutes to destabilize and produce small alum flowers; S4, the wastewater from the No. 1 medium-speed reaction tank enters the No. 2 fast reaction tank, and a quantitative decolorizing flocculant YD-02 is added, and the stirring rate is 110-120r / min. After stirring for 2-5 minutes, it combines with the small alum flowers produced by destabilization to form flocculation nuclei, and at the same time, ions are exchanged and adsorbed to part of the mineral processing reagents; S5. The wastewater from the No. 2 fast reaction tank enters the No. 3 slow reaction tank, and a quantitative decolorizing flocculant YD-03 is added. The stirring rate is 17-25r / min. After stirring for 2-10 minutes, the small alum flowers produced by destabilization are combined to form large flocs. The large alum flowers collide with each other to absorb smaller and finer colloidal particles in the water, achieving the purpose of mud and water separation; S6. After the separation of mud and water, the flocs and water mixture enter the sedimentation tank and quickly settle and clarify; The main component of the water purification flocculant YD-01 is a composite aluminum-iron salt coagulant, with a relative density of ≥1.19 at 20°C, an aluminum oxide content of ≥9.0%, a trivalent iron content of ≤1.0%, a basicity of 45.0%-85.0%, a water-insoluble content of ≤0.5%, a pH value of 1% aqueous solution of 3.5-5.0, an arsenic content of ≤5mg / L, a manganese content of ≤25mg / L, a hexavalent chromium content of ≤10mg / L, and a mercury content of ≤0.2mg / L; The main component of the decolorizing flocculant YD-02 is an activated mineral with ion exchange and the ability to adsorb the color-developing group of the mineral processing agent. The mass fraction of free acid calculated as H2SO4 is ≤0.50%, and the activity is ≥190H + mmol / Kg, water mass fraction ≤13%, fineness ≥200 mesh, bulk density 0.55±0.10g / mL, pH of 50g / L suspension 2.2-4.8, heavy metal content in terms of Pb ≤40mg / kg, arsenic content ≤3mg / kg; The main component of the decolorizing flocculant YD-03 is a high molecular flocculant with a solid content of ≥90%, a molecular weight of 5 million to 12 million, and an ionicity of 5% to 80%; The multi-metal ore dressing wastewater includes at least two combinations of tungsten dressing wastewater, bismuth dressing wastewater, molybdenum dressing wastewater, fluorite dressing wastewater, and lead and zinc dressing wastewater; The COD of the tailings supernatant before step S1 is 120-160 mg / L and the pH is 8.5-9.0; The water quality after treatment in step S1 has a COD of 40-70 mg / L, a pH of 7.2-7.6, a chromaticity of 40-60 times, and a turbidity of 20-40 mg / L; the water quality after treatment in steps S2-S6 has a COD of 30-50 mg / L, a pH of 6.9-7.2, a chromaticity of 15-17 times, and a turbidity of 0-15 mg / L.

2. A process for treating colored polymetallic ore dressing wastewater according to claim 1, characterized in that: The dosage of the water purification flocculant YD-01 is 0.0001-0.00015M 3 / M 3 The dosage of the decolorizing flocculant YD-02 is 0.0008-0.0001 tons / M 3 The dosage of the water purification flocculant YD-03 is 0.0000008-0.000001 tons / M 3 .

3. A treatment system for the treatment process of colored multi-metallic ore dressing wastewater according to any one of claims 1-2, comprising a ore dressing tailings wastewater pool, a tailings reservoir, a wastewater homogenization pool, and a sedimentation pool, characterized in that: It also includes reaction systems, effluent pasteurization tanks, and reagent storage tanks; The reaction system comprises a No. 1 medium-speed reaction pool, a No. 2 fast reaction pool, and a No. 3 slow reaction pool; The reagent storage tanks include a composite iron salt storage tank, a water purification flocculant YD-01 storage tank, a decolorization flocculant YD-02 storage tank, and a decolorization flocculant YD-03 storage tank; The mineral processing tailings wastewater pool is connected in sequence to the tailings pond, the wastewater station homogenization pool, the No. 1 medium-speed reaction pool, the No. 2 rapid reaction pool, the No. 3 slow reaction pool, the sedimentation pool, and the external discharge pasteurization pool; the drug outlet of the composite iron salt storage tank is added at the entrance of the unloading box where the mineral processing tailings wastewater enters the storage, the drug outlet of the water purification flocculant YD-01 storage tank is dripped on the surface of the No. 1 medium-speed reaction pool, the drug outlet of the decolorization flocculant YD-02 storage tank is dripped on the surface of the No. 2 rapid reaction pool, and the drug outlet of the decolorization flocculant YD-03 storage tank is dripped on the surface of the No. 3 slow reaction pool.

4. A treatment system for colored multi-metallic ore dressing wastewater according to claim 3, characterized in that: It also includes a stirring device, which is respectively installed at the bottom of the No. 1 medium-speed reaction tank, the No. 2 fast reaction tank and the No. 3 slow reaction tank.

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