A treating agent for deep copper removal of lead anode plate and a preparation method thereof

Abstract

This invention relates to the field of copper removal agents, and more particularly to a deep copper removal agent for lead anode plates and its preparation method. The agent comprises the following components: 1-5% modified bentonite, 5-15% sulfur powder, 2-4% rice husk, 2-5% binder, and 71-90% pyrite. The binder includes polyethylene, polypropylene, polyurethane, and thermosetting acrylic resin. This invention ensures the sulfur content and particle size of the copper removal agent, with a sulfur content greater than 50%, greatly improving copper removal efficiency. It effectively reduces the copper content in lead anode plates, solves the problem of incomplete copper removal, improves the purity of the anode plates, and effectively avoids dust generation from the copper removal agent. This ensures a safe working environment while guaranteeing sufficient contact and reaction of the copper removal agent during copper removal, thus improving copper removal efficiency and agent utilization.

Description

Technical Field

[0001] This invention relates to the field of refining technology in lead smelting, and particularly to copper removal technology for crude lead before electrolytic refining and copper removal treatment agents, a treatment agent for deep copper removal of lead anode plates and its preparation method. Background Technology

[0002] Lead is a corrosion-resistant heavy non-ferrous metal. It possesses advantages such as a low melting point, high corrosion resistance, poor penetration by X-rays and gamma rays, and good plasticity. It is commonly processed into sheets and pipes and widely used in chemical, cable, battery, and radiation protection industries. Crude lead contains impurities such as Au, Ag, Cu, Sn, As, Sb, Zn, and S. The presence of these elements is highly detrimental to the properties of lead and must be separated and recovered to the greatest extent possible. Currently, over 85% of crude lead in my country is refined using electrolytic methods. Electrolytic refining involves casting crude lead into anode plates, which are then placed in an electrolyte along with cathode plates made of pure lead. Electrolysis is then performed, causing lead to dissolve at the anode, forming lead ions that enter the electrolyte. These lead ions then precipitate at the cathode, producing pure lead, thus achieving lead purification. Meanwhile, impurities such as Au, Ag, Cu, As, and Sb remain on the anode plates, forming lead anode mud, which is an important raw material for the recovery of these valuable metals. Before electrolytic refining, these impurities need to be initially removed, the most important step being copper removal. Copper removal typically employs two methods: melting and sulfidation. The basic principle of melting removal is based on the fact that the solubility of copper in molten lead decreases with decreasing temperature. When the lead liquid with a high copper content cools, the copper precipitates out of the molten lead, forming a copper slag that can be skimmed off. However, the theoretical limit for melting removal is 0.06%. Sulfidation removal is based on the fact that sulfur has a greater affinity for copper than lead. A copper-removing agent (sulfur, low-valence sulfides) is added, causing copper to react with sulfur to form copper sulfide, which is then removed as slag.

[0003] If sulfur is used as a copper removal agent, it has the disadvantage of being easily oxidized, forming sulfur dioxide and polluting the working environment. Other copper removal agents have disadvantages such as low sulfur content, excessively fine particles, large dosage, and dust pollution, resulting in low utilization rate of the copper removal agent. Therefore, it is very important to prepare a copper removal agent with high sulfur content and appropriate particle size in the process of removing copper from crude lead. Therefore, this application proposes a treatment agent for deep copper removal from lead anode plates and its preparation method. Summary of the Invention

[0004] The purpose of this invention is to address the problem in the background art of how to properly handle lead anode plate debris during electrowinning, and to propose a treatment agent for deep copper removal from lead anode plates and its preparation method.

[0005] On one hand, the technical solution of the present invention is: a treatment agent for deep copper removal from lead anode plates, the treatment agent comprising the following components in the following proportions:

[0006]

[0007] The adhesive includes polyethylene, polypropylene, polyurethane, and thermosetting acrylic resin.

[0008] Optionally, the treatment agent includes the following components in the following amounts:

[0009]

[0010] Optionally, the pyrite has a particle size of less than 0.074 mm and a sulfur content of 30-45%.

[0011] Optionally, the mass ratio of polyethylene, polypropylene, polyurethane, and thermosetting acrylic resin in the adhesive is 1:1:2:3.

[0012] Optionally, the method for preparing the adhesive includes the following steps:

[0013] Step 1: Mix polyethylene and polypropylene, heat to 110-120℃, stir and mix evenly to obtain a mixture;

[0014] Step 2: Add polyurethane and thermosetting acrylic resin to the mixture, then heat to 125-130℃, stir and mix, then dry the organic polymer to transform it into a solid binder, and then pulverize the solid binder to obtain the binder.

[0015] Optionally, a stainless steel mixer is used for mixing, with a mixing speed of 300-500 rad / min.

[0016] On the other hand, the present invention provides a method for preparing a treatment agent for deep copper removal from lead anode plates, comprising the following steps:

[0017] S1. Dry and pulverize the bentonite, wash it with water to remove sand, purify it to a montmorillonite content of more than 98 wt%, and then pulverize it to 1000-2000 mesh to obtain bentonite powder;

[0018] S2. Disperse 0.003 mol Mg(NO3)2·6H2O and 0.001 mol Al(NO3)3·9H2O in deionized water, add 0.015 mol urea, mix well to obtain a carbonate-type magnesium aluminum hydrotalcite solution.

[0019] S3. Add bentonite powder to a magnesium aluminum hydrotalcite solution of carbonate type, react at 120-150℃ for 6 hours, wash the solid obtained from the reaction until neutral, and dry at 55-65℃ to obtain modified bentonite.

[0020] S4. Mix sulfur powder, rice husks and pyrite evenly to obtain a mixture. Take modified bentonite and binder, mix them with water, and then spray the mixture onto the mixture. Then add it to the granulation equipment to granulate and obtain granular material.

[0021] S5. Screen the granular material to obtain particles with a diameter of 2-20mm for later use. Return the screened powder to the granulator for re-granulation.

[0022] S6. Dry the granular material that meets the particle size requirements at a low temperature of 60-100℃. After drying, the treatment agent is obtained.

[0023] Optionally, the treatment agent has a water content of <2% and a sulfur content of >50%.

[0024] Optionally, in step S4, a stainless steel mixer is used for mixing, and the mixing time is 3-5 hours.

[0025] Optionally, in step S4, a disc granulator is used for granulation, with a rotation speed of 20 r / min-35 r / min and an inclination angle of 46°-60°.

[0026] Compared with the prior art, the present invention has the following beneficial technical effects:

[0027] By adding sulfur powder, rice husks, and pyrite as the main materials for copper removal, the sulfur content of the copper removal agent is guaranteed to be greater than 50%, which greatly improves the copper removal efficiency, effectively reduces the copper content in the lead anode plate, solves the problem of incomplete copper removal, and improves the purity of the anode plate.

[0028] Furthermore, this invention prepares a mixture by uniformly mixing sulfur powder, rice husks, and pyrite. Modified bentonite and binder are mixed with water and then atomized and sprayed onto the mixture. The mixture is then granulated using a granulation device, resulting in copper removal agent particles with a diameter of 2-20 mm. This effectively avoids dust generation from the copper removal agent, ensuring a safe working environment while also guaranteeing sufficient contact and reaction of the copper removal agent during copper removal, thereby improving copper removal efficiency and the utilization rate of the copper removal agent. Detailed Implementation

[0029] The technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the embodiments described below are only some embodiments of this application, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0030] The pyrite involved in this invention is a widely available and inexpensive flotation pyrite powder, generally with a particle size of less than 0.074 mm and a sulfur content of 30-45%.

[0031] Example 1

[0032] The treatment agent includes the following components in the following proportions:

[0033]

[0034] The adhesive includes polyethylene, polypropylene, polyurethane, and thermosetting acrylic resin, with a mass ratio of polyethylene, polypropylene, polyurethane, and thermosetting acrylic resin of 1:1:2:3.

[0035] The method for preparing the adhesive includes the following steps:

[0036] Step 1: Mix polyethylene and polypropylene, heat to 110°C, stir and mix evenly to obtain a mixture;

[0037] Step 2: Add polyurethane and thermosetting acrylic resin to the mixture, then heat to 125°C, stir and mix, then dry the organic polymer to transform it into a solid binder, and then pulverize the solid binder to obtain the binder.

[0038] The preparation method of the treatment agent includes the following steps:

[0039] S1. The bentonite is dried and pulverized, washed with water to remove sand, and purified to a montmorillonite content of more than 98 wt%. Then it is pulverized to 1000 mesh to obtain bentonite powder.

[0040] S2. Disperse 0.003 mol Mg(NO3)2·6H2O and 0.001 mol Al(NO3)3·9H2O in deionized water, add 0.015 mol urea, mix well to obtain a carbonate-type magnesium aluminum hydrotalcite solution.

[0041] S3. Add bentonite powder to a magnesium aluminum hydrotalcite solution of carbonate type, react at 120°C for 6 hours, wash the solid obtained from the reaction until neutral, and dry at 55°C to obtain modified bentonite.

[0042] S4. Mix sulfur powder, rice husks and pyrite evenly to obtain a mixture. Take modified bentonite and binder and mix them with water. Then spray the mixture onto the mixture. Then add it to the granulation equipment to granulate the material. Granulate the material using a disc granulator with a rotation speed of 20 r / min and an inclination angle of 46°.

[0043] S5. Screen the granular material to obtain particles with a diameter of 2-20mm for later use. Return the screened powder to the granulator for re-granulation.

[0044] S6. The granular material that meets the particle size requirement is dried at a low temperature of 60℃. After drying, the moisture content of the treatment agent is <2% and the sulfur content is greater than 50%, thus obtaining the treatment agent.

[0045] Example 2

[0046] The treatment agent includes the following components in the following proportions:

[0047]

[0048]

[0049] The adhesive includes polyethylene, polypropylene, polyurethane, and thermosetting acrylic resin, with a mass ratio of polyethylene, polypropylene, polyurethane, and thermosetting acrylic resin of 1:1:2:3.

[0050] The method for preparing the adhesive includes the following steps:

[0051] Step 1: Mix polyethylene and polypropylene, heat to 112°C, stir and mix evenly to obtain a mixture;

[0052] Step 2: Add polyurethane and thermosetting acrylic resin to the mixture, then heat to 122°C, stir and mix, then dry the organic polymer to transform it into a solid binder, and then pulverize the solid binder to obtain the binder.

[0053] The preparation method of the treatment agent includes the following steps:

[0054] S1. The bentonite is dried and pulverized, washed with water to remove sand, and purified to a montmorillonite content of more than 98 wt%. Then it is pulverized to 1300 mesh to obtain bentonite powder.

[0055] S2. Disperse 0.003 mol Mg(NO3)2·6H2O and 0.001 mol Al(NO3)3·9H2O in deionized water, add 0.015 mol urea, mix well to obtain a carbonate-type magnesium aluminum hydrotalcite solution.

[0056] S3. Add bentonite powder to a magnesium aluminum hydrotalcite solution of carbonate type, react at 130°C for 6 hours, wash the solid obtained from the reaction until neutral, and dry at 58°C to obtain modified bentonite.

[0057] S4. Take modified bentonite, sulfur powder, rice husk, binder and pyrite and mix them evenly. Use a stainless steel mixer to mix for 4 hours. Then add it to the granulation equipment for granulation. Use a disc granulator with a rotation speed of 22 r / min and an inclination angle of 48°.

[0058] S5. Screen the granular material to obtain particles with a diameter of 2-20mm for later use. Return the screened powder to the granulator for re-granulation.

[0059] S6. The granular material that meets the particle size requirement is dried at a low temperature of 70℃. After drying, the moisture content of the treatment agent is <2% and the sulfur content is greater than 50%, thus obtaining the treatment agent.

[0060] Example 3

[0061] The treatment agent includes the following components in the following proportions:

[0062]

[0063] The adhesive includes polyethylene, polypropylene, polyurethane, and thermosetting acrylic resin, with a mass ratio of polyethylene, polypropylene, polyurethane, and thermosetting acrylic resin of 1:1:2:3.

[0064] The method for preparing the adhesive includes the following steps:

[0065] Step 1: Mix polyethylene and polypropylene, heat to 115°C, stir and mix evenly to obtain a mixture;

[0066] Step 2: Add polyurethane and thermosetting acrylic resin to the mixture, then heat to 127°C, stir and mix, then dry the organic polymer to transform it into a solid binder, and then pulverize the solid binder to obtain the binder.

[0067] The preparation method of the treatment agent includes the following steps:

[0068] S1. The bentonite is dried and pulverized, washed with water to remove sand, and purified to a montmorillonite content of more than 98 wt%. Then it is pulverized to 1500 mesh to obtain bentonite powder.

[0069] S2. Disperse 0.003 mol Mg(NO3)2·6H2O and 0.001 mol Al(NO3)3·9H2O in deionized water, add 0.015 mol urea, mix well to obtain a carbonate-type magnesium aluminum hydrotalcite solution.

[0070] S3. Add bentonite powder to a magnesium aluminum hydrotalcite solution of carbonate type, react at 135°C for 6 hours, wash the solid obtained from the reaction until neutral, and dry at 60°C to obtain modified bentonite.

[0071] S4. Mix sulfur powder, rice husks and pyrite evenly to obtain a mixture. Take modified bentonite and binder and mix them with water. Then spray the mixture onto the mixture. Then add it to the granulation equipment to granulate and obtain granular material. The rotation speed of the disc granulator is 25 r / min and the tilt angle of the disc granulator is 50°.

[0072] S5. Screen the granular material to obtain particles with a diameter of 2-20mm for later use. Return the screened powder to the granulator for re-granulation.

[0073] S6. The granular material that meets the particle size requirement is dried at a low temperature of 80℃. After drying, the moisture content of the treatment agent is <2% and the sulfur content is greater than 50%, thus obtaining the treatment agent.

[0074] Example 4

[0075] The treatment agent includes the following components in the following proportions:

[0076]

[0077] The adhesive includes polyethylene, polypropylene, polyurethane, and thermosetting acrylic resin, with a mass ratio of polyethylene, polypropylene, polyurethane, and thermosetting acrylic resin of 1:1:2:3.

[0078] The method for preparing the adhesive includes the following steps:

[0079] Step 1: Mix polyethylene and polypropylene, heat to 118°C, stir and mix evenly to obtain a mixture;

[0080] Step 2: Add polyurethane and thermosetting acrylic resin to the mixture, then heat to 128°C, stir and mix, then dry the organic polymer to transform it into a solid binder, and then pulverize the solid binder to obtain the binder.

[0081] The preparation method of the treatment agent includes the following steps:

[0082] S1. The bentonite is dried and pulverized, washed with water to remove sand, and purified to a montmorillonite content of more than 98 wt%. Then it is pulverized to 1800 mesh to obtain bentonite powder.

[0083] S2. Disperse 0.003 mol Mg(NO3)2·6H2O and 0.001 mol Al(NO3)3·9H2O in deionized water, add 0.015 mol urea, mix well to obtain a carbonate-type magnesium aluminum hydrotalcite solution.

[0084] S3. Add bentonite powder to a magnesium aluminum hydrotalcite solution of carbonate type, react at 140°C for 6 hours, wash the solid obtained from the reaction until neutral, and dry at 62°C to obtain modified bentonite.

[0085] S4. Mix sulfur powder, rice husks and pyrite evenly to obtain a mixture. Take modified bentonite and binder and mix them with water. Then spray the mixture onto the mixture. Then add it to the granulation equipment to granulate the material. Granulate the material using a disc granulator with a rotation speed of 30 r / min and an inclination angle of 55°.

[0086] S5. Screen the granular material to obtain particles with a diameter of 2-20mm for later use. Return the screened powder to the granulator for re-granulation.

[0087] S6. The granular materials that meet the particle size requirements are dried at a low temperature of 90℃. After drying, the moisture content of the treatment agent is <2% and the sulfur content is greater than 50%, thus obtaining the treatment agent.

[0088] Example 5

[0089] The treatment agent includes the following components in the following proportions:

[0090]

[0091] The adhesive includes polyethylene, polypropylene, polyurethane, and thermosetting acrylic resin, with a mass ratio of polyethylene, polypropylene, polyurethane, and thermosetting acrylic resin of 1:1:2:3.

[0092] The method for preparing the adhesive includes the following steps:

[0093] Step 1: Mix polyethylene and polypropylene, heat to 120°C, stir and mix evenly to obtain a mixture;

[0094] Step 2: Add polyurethane and thermosetting acrylic resin to the mixture, then heat to 130°C, stir and mix, then dry the organic polymer to transform it into a solid binder, and then pulverize the solid binder to obtain the binder.

[0095] The preparation method of the treatment agent includes the following steps:

[0096] S1. The bentonite is dried and pulverized, washed with water to remove sand, and purified to a montmorillonite content of more than 98 wt%. Then it is pulverized to 2000 mesh to obtain bentonite powder.

[0097] S2. Disperse 0.003 mol Mg(NO3)2·6H2O and 0.001 mol Al(NO3)3·9H2O in deionized water, add 0.015 mol urea, mix well to obtain a carbonate-type magnesium aluminum hydrotalcite solution.

[0098] S3. Add bentonite powder to a magnesium aluminum hydrotalcite solution of carbonate type, react at 150°C for 6 hours, wash the solid obtained from the reaction until neutral, and dry at 65°C to obtain modified bentonite.

[0099] S4. Mix sulfur powder, rice husks and pyrite evenly to obtain a mixture. Take modified bentonite and binder and mix them with water. Then spray the mixture onto the mixture. Then add it to the granulation equipment to granulate the material. Granulate the material using a disc granulator with a rotation speed of 35 r / min and an inclination angle of 60°.

[0100] S5. Screen the granular material to obtain particles with a diameter of 2-20mm for later use. Return the screened powder to the granulator for re-granulation.

[0101] S6. The granular material that meets the particle size requirement is dried at a low temperature of 100℃. After drying, the moisture content of the treatment agent is <2% and the sulfur content is greater than 50%, thus obtaining the treatment agent.

[0102] Comparative Example 1

[0103] The treatment agent includes the following components in the following proportions:

[0104]

[0105] The adhesive includes polyethylene, polypropylene, polyurethane, and thermosetting acrylic resin, with a mass ratio of polyethylene, polypropylene, polyurethane, and thermosetting acrylic resin of 1:1:2:3.

[0106] The preparation method includes the following steps:

[0107] Step 1: Take polyethylene and polypropylene and stir them evenly at room temperature. Use a stainless steel mixer and stir at a speed of 400 rad / min to obtain a mixture.

[0108] Step 2: Add polyurethane and thermosetting acrylic resin to the mixture, then heat to 85°C and stir to mix to obtain the adhesive.

[0109] The preparation method of the treatment agent includes the following steps:

[0110] S1. Mix sulfur powder, rice husks and pyrite evenly to obtain a mixture. Take modified bentonite and mix it with water, then spray it onto the mixture by atomization. Then add it to the granulation equipment to granulate the material and obtain granules. Use a disc granulator to granulate the material. The speed of the disc granulator is 25 r / min and the tilt angle of the disc granulator is 50°.

[0111] S2. Screen the granular material to obtain particles with a diameter of 2-20mm for later use. Return the sieved powder to the granulator for re-granulation.

[0112] S3. Dry the granular material that meets the particle size requirements at a low temperature of 80℃. After drying, the moisture content of the treatment agent is <2%, thus obtaining the treatment agent.

[0113] Comparative Example 2

[0114] The treatment agent includes the following components in the following proportions:

[0115]

[0116] The preparation method of the treatment agent includes the following steps:

[0117] S1. Mix sulfur powder, rice husks and pyrite evenly to obtain a mixture. Take modified bentonite and mix it with water. Then spray it onto the mixture by atomization. Then add it to the granulation equipment to granulate and obtain granular material. The rotation speed of the disc granulator is 25 r / min and the tilt angle of the disc granulator is 50°.

[0118] S2. Screen the granular material to obtain particles with a diameter of 2-20mm for later use. Return the sieved powder to the granulator for re-granulation.

[0119] S3. Dry the granular material that meets the particle size requirements at a low temperature of 80℃. After drying, the moisture content of the treatment agent is <2%, thus obtaining the treatment agent.

[0120] To verify the copper removal effect of the present invention, the treatment agents of Examples 1-5 and Comparative Examples 1-2 were tested. Test procedure: Crude lead with a copper content of 3-7% was added to a lead melting pot, melted, and heated to 460℃-560℃. The surface scum was mostly skimmed off. A mixer was placed and turned on. The prepared copper removal agent was added to the lead melt at 2% of the lead content in the melting pot. The temperature was maintained at 460℃-500℃, and the mixture was stirred for 20-40 minutes. The mixer was then removed, and the surface scum was skimmed off to obtain copper-removed crude lead. This was then cast to obtain lead anode plates. The stability during casting was tested, and the copper content of the lead anode plates was determined using a spark direct-reading spectrometer. The following data were obtained:

[0121] Test data from Examples 1-5 and Comparative Examples 1-2

[0122] Test Project Dust generation during copper stripping Copper content (wt%) of lead anode plates Example 1 No dust 0.0011 Example 2 No dust 0.00033 Example 3 No dust 0.00038 Example 4 No dust 0.00058 Example 5 No dust 0.00035 Comparative Example 1 A small amount of dust 0.03 Comparative Example 2 There is a lot of dust. 0.04

[0123] The data in the table shows that the treatment agents in Examples 1-5 are significantly effective in copper removal. The copper content of the lead anode plates in Examples 1-5 is between 0.00033% and 0.0011%, greatly reducing the copper content of the lead anode plates. Furthermore, the dust generated during casting is minimized, ensuring a safe working environment. In the above examples, the sulfur content of the copper removal agent is greater than 50%, ensuring the sulfur content and particle size of the copper removal agent, greatly improving copper removal efficiency, preventing dust, and improving the quality of the working environment. Comparison with Comparative Examples 1-2 shows that the specially formulated binder in this application effectively avoids dust generation during copper removal, and its bonding effect is superior to modified bentonite, ensuring better copper removal results in the later stages. By combining the binder and modified bentonite, a copper removal agent with the appropriate particle size is manufactured, while ensuring sufficient contact and reaction during copper removal, greatly improving copper removal efficiency and the utilization rate of the copper removal agent.

[0124] The above specific embodiments are merely several optional embodiments of the present invention. Based on the technical solutions of the present invention and the relevant teachings of the above embodiments, those skilled in the art can make various alternative improvements and combinations to the above specific embodiments.

Claims

1. A treatment agent for deep copper removal from lead anode plates, characterized in that, The treatment agent comprises the following components in the following amounts: Modified bentonite 1-5% Sulfur powder 5-15% Rice husk 2-4% Adhesive 2-5% Pyrite 71-90% The adhesive includes polyethylene, polypropylene, polyurethane, and thermosetting acrylic resin; The mass ratio of polyethylene, polypropylene, polyurethane, and thermosetting acrylic resin in the adhesive is 1:1:2:3; The method for preparing the adhesive includes the following steps: Step 1: Mix polyethylene and polypropylene, heat to 110-120℃, stir and mix evenly to obtain a mixture; Step 2: Add polyurethane and thermosetting acrylic resin to the mixture, then heat to 125-130℃, stir and mix, then dry the organic polymer to transform it into a solid binder, and then pulverize the solid binder to obtain the binder.

2. The treatment agent for deep copper removal from lead anode plates according to claim 1, characterized in that, The treatment agent comprises the following components in the following amounts: Modified bentonite 2-4% Sulfur powder 7-12% Rice husk 3-4% Adhesive 3-5% Pyrite 75-85%.

3. The treatment agent for deep copper removal from lead anode plates according to claim 2, characterized in that, The pyrite has a particle size of less than 0.074 mm and a sulfur content of 30-45%.

4. A method for preparing the treatment agent for deep copper removal from lead anode plates according to claim 3, characterized in that, Includes the following steps: S1. Dry and pulverize the bentonite, wash it with water to remove sand, purify it to a montmorillonite content of more than 98 wt%, and then pulverize it to 1000-2000 mesh to obtain bentonite powder; S2. Disperse 0.003 mol Mg(NO3)2·6H2O and 0.001 mol Al(NO3)3·9H2O in deionized water, add 0.015 mol urea, mix well to obtain a carbonate-type magnesium aluminum hydrotalcite solution. S3. Add bentonite powder to a magnesium aluminum hydrotalcite solution of carbonate type, react at 120-150℃ for 6 hours, wash the solid obtained from the reaction until neutral, and dry at 55-65℃ to obtain modified bentonite. S4. Mix sulfur powder, rice husks and pyrite evenly to obtain a mixture. Take modified bentonite and binder, mix them with water, and then spray the mixture onto the mixture. Then add it to the granulation equipment to granulate and obtain granular material. S5. Screen the granular material to obtain particles with a diameter of 2-20mm for later use. Return the screened powder to the granulator for re-granulation. S6. Dry the granular material that meets the particle size requirements at a low temperature, setting the drying temperature to 60-100℃. After drying, the treatment agent is obtained.

5. The method for preparing a deep copper removal treatment agent for lead anode plates according to claim 4, characterized in that, The treatment agent has a water content of <2% and a sulfur content of >50%.

Images