CN113651485B - Method for removing heavy metals in water body - Google Patents

Method for removing heavy metals in water body Download PDF

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Publication number
CN113651485B
CN113651485B CN202110951225.5A CN202110951225A CN113651485B CN 113651485 B CN113651485 B CN 113651485B CN 202110951225 A CN202110951225 A CN 202110951225A CN 113651485 B CN113651485 B CN 113651485B
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container
solution
magnetic
heavy metals
water
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CN113651485A (en
Inventor
张少博
陈国木
徐宏凯
周中华
朱国邦
邱伟佳
杨全胜
刘自虎
许华东
刘建平
吴钧
高文键
霍红辉
姜艳
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YUNNAN YUNTONG ZINC CO Ltd
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YUNNAN YUNTONG ZINC CO Ltd
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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
    • 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
    • C02F1/48—Treatment of water, waste water, or sewage with magnetic or electric fields
    • C02F1/488—Treatment of water, waste water, or sewage with magnetic or electric fields for separation of magnetic materials, e.g. magnetic flocculation
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • 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
    • C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
    • C02F1/56—Macromolecular compounds
    • 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
    • C02F1/58—Treatment of water, waste water, or sewage by removing specified dissolved compounds
    • C02F1/62—Heavy metal compounds
    • 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
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • 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
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/16—Nature of the water, waste water, sewage or sludge to be treated from metallurgical processes, i.e. from the production, refining or treatment of metals, e.g. galvanic wastes

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Removal Of Specific Substances (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)

Abstract

The invention relates to a method for removing heavy metals in a water body, which comprises the following steps: adding an alkali solution into water containing heavy metals to obtain an alkali aqueous solution; adding a weight removing agent into the alkaline aqueous solution to obtain a first mixed solution; adding magnetic powder into the first mixed solution to obtain a magnetic flocculation solution; and carrying out solid-liquid separation on the magnetic flocculation solution to obtain water for removing heavy metals. Adopts a mode of combining the medicament weight removing technology and the magnetic flocculation separation. Meanwhile, the characteristics of quick reaction speed, good weight removal effect and no pollution to water body of the reagent quick weight removal technology are utilized, so that heavy metals in water quality reach the standard quickly, and the reagent quick weight removal technology is environment-friendly. And the characteristics of small occupied area, short construction period, large treatment capacity, low maintenance cost and easy operation of personnel are utilized.

Description

Method for removing heavy metals in water body
Technical Field
The invention relates to the technical field of metal smelting, in particular to a method for removing heavy metals in a water body.
Background
In the traditional nonferrous smelting industry, due to the problems of material transportation, pipeline cleaning, equipment maintenance, leakage, etc., the problems of splashing and leakage of heavy metal-containing materials exist. In rainy season, the heavy metals in the initial rainwater are particularly easy to mix with the initial rainwater, and the heavy metals in the initial rainwater exceed the emission standard of lead and zinc industrial pollutants in GB25466-2010 times, so that the initial rainwater with low concentration of heavy metals is required to be effectively collected and treated.
The heavy metals may be removed from the water by chemically converting the soluble heavy metals into insoluble or poorly soluble metal compounds. The method for removing insoluble or indissolvable metal compounds mainly adopts a thickener, an inclined plate sedimentation tank, a plate-and-frame filter press and the like, and has the problems of large occupied area, small unit area treatment capacity, high basic investment, long construction period and high operation difficulty.
Thus, the prior art is still further improved.
Disclosure of Invention
In view of the defects of the prior art, the invention aims to provide a method for removing heavy metals in water, which aims to solve the problems of high time-based investment and high operation difficulty in the existing method for removing the heavy metals in water.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a method of removing heavy metals from a body of water, wherein the method comprises:
adding an alkali solution into water containing heavy metals to obtain a neutralization solution;
adding a weight removing agent into the neutralization solution to obtain a first mixed solution;
adding magnetic powder into the first mixed solution to obtain a magnetic flocculation solution;
and carrying out solid-liquid separation on the magnetic flocculation solution to obtain water for removing heavy metals.
Optionally, the method for removing heavy metals in a water body, wherein the method comprises the following steps:
transferring the water containing heavy metals into a first container, and regulating the water containing heavy metals to be alkaline to obtain a neutralization solution;
transferring the neutralization solution to a second container, and adding a weight removing agent into the second container according to the first adding amount to obtain a first-stage solution;
transferring the first-stage liquid to a third container, and adding the weight-removing agent into the third container according to the second adding amount to obtain a second-stage liquid;
and adding magnetic powder into the two-stage liquid to obtain a magnetic flocculation solution, and performing magnetic separation on the magnetic flocculation solution to obtain water for removing heavy metals.
Optionally, in the method for removing heavy metals in a water body, the step of adding magnetic powder into the two-stage liquid to obtain a magnetic flocculation solution, and performing magnetic separation on the magnetic flocculation solution to obtain solid matters and water specifically includes:
transferring the two-stage liquid into a fourth container to obtain a magnetic flocculation pre-liquid;
sequentially adding magnetic powder, coagulant aid and flocculant into the magnetic flocculation pre-solution to obtain a magnetic flocculation solution;
and magnetically separating the magnetic floccule solution to obtain sludge containing the magnet and the heavy metal, and demagnetizing the sludge to obtain solid matters and water.
Optionally, in the method for removing heavy metals in water, the step of sequentially adding magnetic powder, coagulant aid and flocculant into the magnetic flocculation pre-solution to obtain a magnetic flocculation solution specifically comprises the following steps:
the magnetic powder is regulated into slurry, the slurry is added into the magnetic flocculation pre-liquid through a pump body, then coagulant aid is added into the magnetic flocculation pre-liquid, and the mixture is stirred at a first stirring speed to obtain a second mixed solution;
and adding a flocculating agent into the second mixed solution, and stirring at a second stirring speed to obtain a magnetic flocculation solution.
Optionally, in the method for removing heavy metals in water, the first stirring speed is 250-500r/min, and the second stirring speed is 200-300r/min.
Optionally, the method for removing heavy metals in the water body, wherein the pH value of the neutralization solution is 9.0-11.5.
Optionally, the method for removing heavy metals in the water body comprises the step of adding 100-200mg of the heavy metal-containing water per liter of the first adding amount; the second adding amount is 10-100mg/L of water containing heavy metals.
Optionally, the method for removing heavy metals in the water body comprises the step of adding one or more of aluminum sulfate, polyaluminum chloride and ferrous sulfate into each liter of water containing heavy metals, wherein the adding amount of the coagulant aid is 20-100mg.
Optionally, the method for removing heavy metals in the water body comprises the step of adding 10-50mg of the cationic flocculant into each liter of water containing the heavy metals.
Optionally, the method for removing heavy metals in the water body comprises the step of adding 10-100g of the magnetic powder into each liter of water containing the heavy metals.
The beneficial effects are that: the method for removing heavy metals in the water body provided by the invention adopts a mode of combining a medicament weight removal technology and magnetic flocculation separation. Meanwhile, the characteristics of quick reaction speed, good weight removal effect and no pollution to water body of the reagent quick weight removal technology are utilized, so that heavy metals in water quality reach the standard quickly, and the reagent quick weight removal technology is environment-friendly. The method solves the problems of large occupied area, small treatment capacity per unit area and high maintenance cost of the existing low-concentration heavy metal removal equipment by utilizing the characteristics of small occupied area, short construction period, large treatment capacity, low maintenance cost and easy operation of personnel of the magnetic flocculation technology.
Drawings
FIG. 1 is a schematic flow chart of a method for removing heavy metals in a water body according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a process flow for removing heavy metals from a water body according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a stirring tank according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a magnetic flocculation process provided by an embodiment of the present invention;
FIG. 5 is a schematic diagram of a magnetic separation process according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more clear and clear, the present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention. As used herein, the singular forms "a", "an", "the" and "the" are intended to include the plural forms as well, unless expressly stated otherwise, as understood by those skilled in the art. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The term "and/or" as used herein includes all or any element and all combination of one or more of the associated listed items.
As shown in fig. 1 to 2, an embodiment of the present invention provides a method for removing heavy metals in a water body, the method including:
s10, adding an alkali solution into the water containing the heavy metals to obtain an alkali aqueous solution.
Specifically, the water containing heavy metals refers to sewage formed by flushing ground and equipment polluted by heavy metal ions with rainwater, part of the water can be transferred into a fixed collecting container, then alkaline solution, which can be sodium hydroxide, potassium hydroxide and calcium oxide solution, is added into the container, and the alkaline solution is utilized to neutralize the liquid in the container, so that the aqueous solution in the container is alkaline. The pH of the aqueous solution may be 9.0 to 9.5,9.5 to 10.0,10.0 to 10.5,10.5 to 11.0,11.0 to 11.5. In order to ensure the neutralization effect, the proportion of the neutralization agent can be controlled by pH linkage, and the proportion is changed along with the water quality condition and is added according to the sodium hydroxide solution.
S20, adding a weight removing agent into the alkaline aqueous solution to obtain a first mixed solution.
Specifically, the heavy metal ion removing agent refers to an agent for removing heavy metal ions, which is capable of reacting with heavy metal ions such as Cu in water 2+ 、Zn 2+ 、Cd 2+ 、Pb 2+ 、Mn 2+ And the like, a complexation reaction is carried out, so that metal ions are transferred from water to the heavy-removal agent for separation. The weight removing agent can be one or more of common weight removing agents such as DTCR, HSJ-DEM, HMC-M1, HMC-M2 and the like.
S30, adding magnetic powder into the first mixed solution to obtain a magnetic flocculation solution.
Specifically, the magnetic powder refers to magnetic powder with magnetism, the type of the magnetic powder can be that the content of magnetic substances is more than or equal to 98.5 percent, and the true density is more than or equal to 4.85g/m 3 Magnetic powder with 300 meshes. The obtained magnetic floccules can be magnetic by adding magnetic powder so as to facilitate the subsequent separation.
S40, carrying out solid-liquid separation on the magnetic flocculation solution to obtain water for removing heavy metals.
Specifically, the obtained magnetic flocculation solution is subjected to solid-liquid separation, for example, the magnetic flocculation solution is introduced into a thickener for filtration, and filter residues are removed, so that water (up-to-standard water) without heavy metal or extremely high heavy metal content is obtained.
In the embodiment, the heavy metal in the water is removed by adopting a mode of combining the heavy metal removing agent and the magnetic flocculation separation technology, and the method has the characteristics of rapid removal of the heavy metal and no pollution to the water body.
In one implementation manner of this embodiment, the method for removing heavy metals in a water body specifically includes:
transferring the water containing heavy metals into a first container, and regulating the water containing heavy metals to be alkaline to obtain a neutralization solution; transferring the neutralization solution to a second container, and adding a weight removing agent into the second container according to the first adding amount to obtain a first-stage solution; transferring the first-stage liquid to a third container, and adding the weight-removing agent into the third container according to the second adding amount to obtain a second-stage liquid; transferring the two-stage liquid into a fourth container to obtain a magnetic flocculation pre-liquid; the magnetic powder is regulated into slurry, the slurry is added into the magnetic flocculation pre-liquid through a pump body, then coagulant aid is added into the magnetic flocculation pre-liquid, and the mixture is stirred at a first stirring speed to obtain a second mixed solution; adding a flocculating agent into the second mixed solution, and stirring at a second stirring speed to obtain a magnetic floccule solution; and magnetically separating the magnetic floccule solution to obtain sludge containing the magnet and the heavy metal, and demagnetizing the sludge to obtain solid matters and water.
As shown in fig. 3 to 5, in the present embodiment, the first container, the second container, the third container, and the fourth container may be a tank to a stirring device or a reaction tank. Referring to fig. 3, the four containers are four square stirring tanks, wherein a first tank 10 corresponds to a first container, a second tank 20 corresponds to a second container, a third tank 30 corresponds to a third container, a fourth tank 40 corresponds to a fourth container, and stirring devices are arranged in each tank. The first groove is communicated with the second groove through an opening arranged at the upper part of the partition plate 11, the second groove is communicated with the third groove through an opening arranged at the lower part of the partition plate 12, the third groove is communicated with the fourth groove through an opening arranged at the upper part of the partition plate 13, and the first groove and the fourth groove are separated through a partition plate 14.
In this embodiment, the first tank is mainly used for neutralization, so that the solution is alkaline, the solution with the pH adjusted flows into the second tank from the upper opening, and the weight removing agent is added into the second tank, wherein the adding amount can be 100-200mg per liter of water containing heavy metals. For better addition, the weight-removing agent can be prepared into 10-30% solution according to the gravity ratio, and then 150mg/L of the solution is added. The solution added with the heavy-duty removing agent flows into the third tank through the opening at the lower part of the partition plate between the second tank and the third tank. Because the weight removing agent is added to facilitate the flow into the third tank, it should flow through the lower opening. The third tank is supplemented with weight removing agent, so the adding amount can be 10-100mg/L (such as 50 mg/L). The heavy metals in water can be completely separated out by adding the heavy-removing agent. The solution in the third tank flows into the fourth tank from the opening at the upper part of the partition plate to obtain the magnetic flocculation pre-liquid.
Pumping the magnetic flocculation precursor liquid into a No. 1 reaction box through a submersible pump, adding magnetic powder into the No. 1 box, and for better addition, preparing the magnetic powder into slurry with the preparation proportion of 10-30%, wherein the added magnetic powder has the magnetic material content of more than or equal to 98.5% and the true density of more than or equal to 4.85g/m 3 Particle size-300 mesh 93%. Then the mixed solution in the No. 1 box flows into the No. 2 reaction box, a coagulant aid with a certain proportion is added into the No. 2 reaction box, the added coagulant aid is one or more of aluminum sulfate, polyaluminum chloride and ferrous sulfate, the preparation proportion is 10-30%, and the adding proportion needs to be adjusted according to the site, such as 20-100mg/L. After high-speed stirring, the obtained mixed solution flows into a No. 3 reaction box, a certain amount of flocculating agent is added into the No. 3 reaction box for medium-speed stirring, and then the mixed solution passes through a No. 4 reaction box (low-speed stirring) to form a magnetic flocculation solution with certain buoyancy. The type of the flocculant is cation type, the solid content is 88%, the preparation proportion is 0.5-3 per mill in the ionization degree, and the adding proportion is required to be adjusted according to the site, for example, 10-50mg/L.
In the embodiment, the magnetic powder and the coagulant aid are added and fully stirred, the rotating speed is controlled to be 250-500r/min, and the process of adding the flocculant to form magnetic floccules needs low-speed stirring, and the rotating speed is controlled to be 50-100r/min, so that the formed floccules are not damaged.
In the embodiment, the obtained magnetic floccule solution is subjected to magnetic separation to obtain magnetic sludge and clear water; the magnetic sludge is crushed at high speed and then the magnetic powder in the magnetic sludge is collected by a magnetic recycling machine, and the magnetic sludge is subjected to mixed size mixing and then returned to a magnetic flocculation process to obtain demagnetized sludge; and (3) conveying the demagnetized sludge to a dehydration procedure, carrying out dehydration operation, and obtaining metal slag and secondary water, wherein the metal slag and the secondary water are returned to a production system for recycling. Wherein, the dehydration equipment can be selected from a plate frame, a ceramic filter, a belt filter, a vacuum centrifuge and the like, and the water content of the sludge is controlled to be less than 75 percent.
The invention is further illustrated by the following specific examples.
Example 1
A certain smelting plant adopts a conventional wet zinc smelting process, the rainwater at the initial stage of the smelting plant is temporarily collected in a rainy season and then is conveyed into a first tank 10 through a pump, and the first tank is stirred and mixed with added sodium hydroxide solution to obtain a neutralization solution, and the pH value at the end point is controlled to be 9.5. The neutralization solution automatically flows into a second tank 20, 150mg/L of weight-removing agent is added and fully mixed, the weight-removing first-stage solution automatically flows into a third tank 30, the weight-removing second-stage solution is supplemented with 50mg/L of weight-removing agent, and the obtained second-stage weight-removing solution automatically flows into a fourth tank 40, so that the magnetic flocculation pre-liquid is obtained. The method comprises the steps of conveying the magnetic flocculation pre-liquid to a No. 1 box through a submersible pump, adding rare earth magnetic powder (recovered magnetic powder) into the solution according to the proportion of 10g/L after size mixing, flushing and mixing the magnetic seeds into the solution through the power of the pump, enabling the solution to enter a No. 2 box after self-flowing, adding 100mg/L coagulant aid, fully mixing through 300r/min high-speed stirring, enabling the solution to enter a No. 3 box after self-flowing, adding 30mg/L flocculant, fully mixing through medium-speed stirring, and enabling the solution to pass through a No. 4 box while low-speed stirring through 100r/min to form a magnetic flocculation solution with certain buoyancy. And magnetically separating the magnetic flocculation solution to obtain magnetic sludge and clear water, and conveying the clear water to sample for analysis, and recycling or discharging after the detection is qualified. Carrying out high-speed crushing on the magnetic sludge in a magnetic recycling machine, collecting magnetic powder in the magnetic sludge, mixing and pulping, and returning to a magnetic flocculation process to obtain demagnetized sludge; and (3) conveying the demagnetized sludge to a dehydration procedure, carrying out dehydration operation, and obtaining metal slag and secondary water, wherein the metal slag and the secondary water are returned to a production system for recycling.
Example 2
A certain smelting plant adopts a conventional wet zinc smelting process, the rainwater at the initial stage of the smelting plant is temporarily collected in a rainy season and then is conveyed into a first tank by a pump for 10, and the first tank is stirred and mixed with added sodium hydroxide solution to obtain a neutralization solution, and the pH value at the end point is controlled to be 10.5. The neutralization solution automatically flows into a second tank 20, 100mg/L of weight-removing agent is added and fully mixed, the weight-removing first-stage solution automatically flows into a third tank 30, the weight-removing second-stage solution is supplemented with 50mg/L of weight-removing agent, and the obtained second-stage weight-removing solution automatically flows into a fourth tank 40, so that the magnetic flocculation pre-liquid is obtained. The method comprises the steps of conveying the magnetic flocculation pre-liquid to a No. 1 box through a submersible pump, adding rare earth magnetic powder (recovered magnetic powder) into the solution according to the proportion of 10g/L after size mixing, flushing and mixing the magnetic seeds into the solution through the power of the pump, enabling the solution to enter a No. 2 box after self-flowing, adding 50mg/L coagulant aid, fully mixing through 300r/min high-speed stirring, enabling the solution to enter a No. 3 box after self-flowing, adding 20mg/L flocculant, fully mixing through medium-speed stirring, and enabling the solution to pass through a No. 4 box while low-speed stirring through 100r/min to form a magnetic flocculation solution with certain buoyancy. And magnetically separating the magnetic flocculation solution to obtain magnetic sludge and clear water, and conveying the clear water to sample for analysis, and recycling or discharging after the detection is qualified. Carrying out high-speed crushing on the magnetic sludge in a magnetic recycling machine, collecting magnetic powder in the magnetic sludge, mixing and pulping, and returning to a magnetic flocculation process to obtain demagnetized sludge; and (3) conveying the demagnetized sludge to a dehydration procedure, carrying out dehydration operation, and obtaining metal slag and secondary water, wherein the metal slag and the secondary water are returned to a production system for recycling.
Example 3
A certain smelting plant adopts a conventional wet zinc smelting process, the rainwater at the initial stage of the smelting plant is temporarily collected in a rainy season and then is conveyed into a first tank 10 through a pump, the first tank is stirred and mixed with added sodium hydroxide solution to obtain a neutralization solution, and the pH value at the end point is controlled to be 11.5. The neutralization solution automatically flows into a second tank 20, 50mg/L of weight-removing agent is added and fully mixed, the weight-removing first-stage solution automatically flows into a third tank 30, the weight-removing second-stage solution is carried out by the additional 20mg/L weight-removing agent, and the obtained second-stage weight-removing solution automatically flows into a fourth tank 40, so that the magnetic flocculation pre-liquid is obtained. The method comprises the steps of conveying the magnetic flocculation pre-liquid to a No. 1 box through a submersible pump, adding rare earth magnetic powder (recovered magnetic powder) into the solution according to the proportion of 10g/L after size mixing, flushing and mixing the magnetic seeds into the solution through the power of the pump, enabling the solution to enter a No. 2 box after self-flowing, adding 100mg/L coagulant aid, fully mixing through 300r/min high-speed stirring, enabling the solution to enter a No. 3 box after self-flowing, adding 30mg/L flocculant, fully mixing through medium-speed stirring, and enabling the solution to pass through a No. 4 box while low-speed stirring through 100r/min to form a magnetic flocculation solution with certain buoyancy. And magnetically separating the magnetic flocculation solution to obtain magnetic sludge and clear water, and conveying the clear water to sample for analysis, and recycling or discharging after the detection is qualified. Carrying out high-speed crushing on the magnetic sludge in a magnetic recycling machine, collecting magnetic powder in the magnetic sludge, mixing and pulping, and returning to a magnetic flocculation process to obtain demagnetized sludge; and (3) conveying the demagnetized sludge to a dehydration procedure, carrying out dehydration operation, and obtaining metal slag and secondary water, wherein the metal slag and the secondary water are returned to a production system for recycling.
TABLE 1 detection results of heavy metals in effluent mg/L
Figure BDA0003218543460000091
By combining table 1, it can be proved from examples 1, 2 and 3 that the effluent heavy metal obtained by the process of the invention reaches the standard, the solid suspended matters are in the control range, the better weight removing effect is obtained, and the effluent heavy metal obtained by the process of the invention is completely within the standard.
According to practical experience, the neutralization pH value influences the overall effect of the subsequent weight-removing agent increasing and decreasing and the magnetic flocculation stage, and the pH value of the front end needs to be strictly controlled. To a certain extent, when the front-end water quality is better, the pH value can be properly increased to form more neutral flocs, and the use of a weight removing agent and a coagulant aid is reduced. When the water quality is severe and other extreme conditions, the inlet water needs to be pretreated, so that a large amount of neutral flocs enter the equipment, and the separation equipment cannot work normally.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
It is to be understood that the invention is not limited in its application to the examples described above, but is capable of modification and variation in light of the above teachings by those skilled in the art, and that all such modifications and variations are intended to be included within the scope of the appended claims.

Claims (2)

1. A method for removing heavy metals from a body of water, comprising:
transferring the water containing heavy metals into a first container, and regulating to be alkaline to obtain a neutralization solution with the pH value of 9.0-11.5;
transferring the neutralization solution to a second container, adding 100-200mg of heavy metal-containing water per liter, and adding a weight removing agent into the neutralization solution in the second container to obtain a first-stage solution;
transferring the first-stage liquid to a third container, adding 10-100mg of the heavy metal-containing water per liter, and adding the heavy metal removing agent into the first-stage liquid of the third container to obtain a second-stage liquid;
transferring the two-stage liquid into a fourth container to obtain a magnetic flocculation pre-liquid, regulating rare earth magnetic powder into slurry, adding the slurry into the magnetic flocculation pre-liquid through a pump body, adding a coagulant aid into the magnetic flocculation pre-liquid, and stirring at a first stirring speed to obtain a second mixed solution;
adding a flocculating agent into the second mixed solution, and stirring at a second stirring speed to obtain a magnetic floccule solution;
performing magnetic separation on the magnetic floccule solution to obtain sludge containing a magnet and heavy metals, and performing demagnetization on the sludge to obtain a solid substance and water;
the first container, the second container, the third container and the fourth container are sequentially connected, a partition plate is arranged between every two adjacent containers, stirring devices are arranged in the first container, the second container, the third container and the fourth container, the first container is communicated with the second container through an opening arranged at the upper part of the partition plate, the second container is communicated with the third container through an opening arranged at the lower part of the partition plate, and the third container is communicated with the fourth container through an opening arranged at the upper part of the partition plate; the neutralization liquid in the first container flows into the second container through an opening at the upper part of a partition plate between the first container and the second container, one section of liquid flows into the third container through an opening at the lower part of the partition plate between the second container and the third container, and two sections of liquid flow into the fourth container through an opening at the upper part of the partition plate between the third container and the fourth container;
the weight removing agent is one or more of DTCR, HSJ-DEM, HMC-M1 and HMC-M2;
the coagulant aid is one or more of aluminum sulfate, polyaluminum chloride and ferrous sulfate, and the addition amount is 20-100mg of the coagulant aid is added into each liter of water containing heavy metals;
the magnetic material content of the rare earth magnetic powder is more than or equal to 98.5%, and the true density is more than or equal to 4.85g/m 3 The granularity is 300 meshes, and the adding amount is 10-100g of the heavy metal-containing water per liter;
the flocculant is a cationic flocculant, and the adding amount is 10-50mg of the flocculant is added into each liter of water containing heavy metals.
2. The method of removing heavy metals from a body of water according to claim 1 wherein said first agitation speed is between 250 and 500r/min and said second agitation speed is between 50 and 100r/min.
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