Resource utilization method and system for copper wire drawing oil sludge

Abstract

The invention discloses a resource utilization method and system for copper wire drawing oil sludge, and relates to the technical field of sludge. The resource utilization method of the copper wire drawing oil sludge comprises the following steps: carrying out crushing treatment on the copper wire drawing oil sludge to be treated; the materials are subjected to pyrolysis treatment, the pyrolysis temperature is larger than or equal to 300 DEG C, and pyrolysis liquid and first sediment are obtained through separation; the first sediment is subjected to vibration screening treatment, large particles are removed, and second sediment with the particle size being 1-400 meshes is obtained through discharging; the second sediment is subjected to magnetic separation treatment, and magnetic metal and third sediment are obtained through separation; and the third sediment is subjected to airflow separation treatment, and copper powder and carbon powder are obtained through separation. According to the method, the oil / water phase is separated and removed through pyrolysis treatment, and the separation processes of vibration screening, magnetic separation and airflow separation are combined, so that iron and copper metals can be effectively recovered from the sediment of the copper wire drawing oil sludge, and resourceful treatment of the copper wire drawing oil sludge is realized; and the copper recovery rate reaches 64.78% or above.

Description

Technical Field

[0001] The present invention relates to the technical field of sludge treatment, and more specifically, to a resource utilization method and system for copper wire drawing sludge. Background Art

[0002] Wire drawing is a metal processing technology; copper wire drawing oil, also known as copper wire drawing liquid, copper stretching oil, copper drawing oil, is an auxiliary agent used in the drawing process of copper and its alloys. It can eliminate static electricity and the adhesion of copper powder after wire drawing, keep the copper wire clean, and has the functions of lubrication, cleaning, cooling, and rust prevention.

[0003] Copper processing is an important part of my country's nonferrous metal industry. Copper wire has oxidation blackening and discoloration, which is common in the copper wire drawing process of the wire and cable industry. In the traditional copper wire production process, pickling and wire drawing are indispensable, and water-based emulsion or oil cooling and flushing products are used. Solids, fungi, and waste oil in the emulsion or wire drawing oil pool are often treated as oil-containing hazardous waste.

[0004] At present, the main method for disposing copper-containing oil sludge waste is incineration. From the perspective of resource utilization, although the disposal of hazardous waste materials is solved, useful resources are wasted at the same time. Since copper-containing wire drawing oil sludge is a niche hazardous waste with limited hazardous waste volume, there are no reports on its resource utilization.

[0005] The recycling of copper-containing waste generally adopts acid treatment and dissolution, and then uses iron powder to replace it, so as to restore copper powder, but it can only recover copper resources. For copper drawing sludge, it not only contains copper, but also rich in a large amount of iron. Recycling only copper will lead to a waste of iron resources. However, there are no related reports on the simultaneous recovery of copper and iron metals in copper drawing sludge to realize the resource utilization of copper drawing sludge waste. Summary of the invention

[0006] The purpose of the present invention is to overcome the defects and shortcomings of the prior art that high-value metals cannot be recovered from copper drawing sludge as resources, and to provide a method for resource utilization of copper drawing sludge.

[0007] Another object of the present invention is to provide a resource utilization system for copper wire drawing sludge.

[0008] The above-mentioned purpose of the present invention is achieved through the following technical solutions:

[0009] The present invention provides a method for resource utilization of copper wire drawing sludge, comprising the following steps:

[0010] S1, crushing the copper wire drawing sludge to be processed;

[0011] S2, pyrolyzing the material after the treatment in step S1 in an anaerobic or anoxic environment, with the pyrolysis temperature being ≥300° C., and separating to obtain a pyrolysis liquid and a first sediment;

[0012] S3, vibrating and screening the first sediment of step S2 to remove large particles, and discharging to obtain a second sediment with a particle size of 1-400 mesh;

[0013] S4, subjecting the second sediment of step S3 to magnetic separation to obtain magnetic metal and third sediment;

[0014] S5, subjecting the third sediment of step S4 to airflow separation treatment, with an airflow velocity of 0.6-1.20 m / s, to separate copper powder and carbon powder.

[0015] The present invention discloses a resource utilization method for copper wire drawing sludge, which can effectively recover iron and copper metals from the sediment of copper wire drawing sludge by separating and removing the oil-water phase through pyrolysis treatment, and combining the separation processes of vibration screening, magnetic separation and airflow separation, so as to realize resource treatment of copper wire drawing sludge. The present invention controls the size and shape of the solid matter through crushing treatment, and then separates the sediment from the pyrolysis liquid through pyrolysis treatment of the copper wire drawing sludge. After the sediment is treated by vibration screening to remove large particles, the magnetic metal is recovered through magnetic separation treatment; then the material is separated by airflow separation treatment to obtain copper powder and carbon powder, and the separation efficiency of copper reaches 85% to 95%, thereby realizing the resource utilization of valuable metals and effectively avoiding the waste of metal resources caused by incineration disposal.

[0016] In some embodiments, in step S2, the pyrolysis temperature is 300-450°C; preferably, the pyrolysis temperature is 350-420°C. The present invention adopts pyrolysis treatment and optimizes the conditions, which can gasify the oil and water in the material and separate them at the same time to form a pyrolysis liquid mixed with oil and water; the lower the temperature, the less oil phase is separated, the separation is not thorough, it is not economical, and there are hidden dangers; the higher the temperature is conducive to improving the separation effect, but the higher the energy consumption, the less economical, and the oil received will decrease and be converted into a gas phase. Subsequently, by controlling the temperature of the pyrolysis treatment, the oil phase and the water phase in the material are separated.

[0017] In some embodiments, the air flow velocity in the air flow sorting process is 0.6 to 1.2 m / s; preferably, the air flow velocity in the air flow sorting process is 0.8 to 1.1 m / s. Copper powder and carbon powder have a large difference in specific gravity, and can be effectively separated by air flow sorting. It is necessary to control the air flow velocity, and when the air flow velocity is 0.6 to 1.2 m / s, the separation of copper powder and carbon powder can be effectively achieved; if the air flow is too low, the copper powder separation will not be complete and the purity of the product will be low; if the air flow is too high, the copper powder recovery rate will decrease.

[0018] In some implementation modes, in step S1, the crushed material is filtered through a sieve, and the sieve has an aperture of 50 to 200 mm.

[0019] In some embodiments, nitrogen replacement is performed before pyrolysis treatment, so that the material is pyrolyzed in an oxygen-free or oxygen-deficient environment.

[0020] In some embodiments, step S2 further includes an oil-water separation process, wherein the oil-water separation process is to separate the pyrolysis liquid into an oil phase and a water phase.

[0021] In some embodiments, in step S2, the oil-water separation process is a condensation process, and the condensation temperature is lower than 60°C.

[0022] In some embodiments, in step S2, the particle size of the discharged second sediment is 100-300 mesh.

[0023] In some of the embodiments, in step S4, the magnetic induction intensity in the magnetic separation process is 100-600 mT.

[0024] In some of the embodiments, in step S1, the size of the material to be crushed is ≤300 mm.

[0025] In some embodiments, the copper wire drawing sludge has a calorific value of 30,000-40,000 J / g, a water content of 40-50%, a solid content of 25-35%, an oil content of 20-30%, a copper content of 50,000-60,000 mg / L, and an iron content of 20,000-30,000 mg / L.

[0026] The present invention provides a resource utilization system for copper wire drawing sludge, comprising:

[0027] A crushing unit is used to crush the copper wire drawing sludge to be processed;

[0028] A pyrolysis unit connected to the discharge end of the crushing unit, used for pyrolysis treatment of the material and separation of pyrolysis liquid and first sediment;

[0029] A vibration screening unit connected to the first sediment discharge end of the pyrolysis unit, used to perform vibration screening on the first sediment to remove large particles and screen out a second sediment with a particle size of 1-400 mesh;

[0030] A magnetic separation unit is connected to the discharge end of the vibration screening unit and is used to perform magnetic separation on the second sediment to magnetically separate the magnetic metal and the third sediment;

[0031] The airflow separation unit is connected to the discharge end of the magnetic separation unit and is used for airflow separation of the third sediment to separate carbon powder and copper powder.

[0032] In some embodiments, the pyrolysis unit includes a heating system, a pyrolysis system, an oil-water separation system, a flue gas purification system, and an electrical control system.

[0033] Preferably, the heating system burns natural gas and produces non-condensable gas after pyrolysis purification.

[0034] Preferably, the pyrolysis temperature of the pyrolysis system is 300-450°C.

[0035] Preferably, the flue gas purification system is used to perform rapid cooling, alkali spraying, demisting and activated carbon adsorption in sequence.

[0036] In some embodiments, the pyrolysis system is a sequential batch pyrolysis device, and the amount of material fed into the furnace in each batch does not exceed 50% of the furnace volume.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] The present invention discloses a resource utilization method for copper wire drawing sludge, which can effectively recover iron and copper metals from the sediment of copper wire drawing sludge by separating and removing the pyrolysis liquid mixed with oil and water through pyrolysis treatment, and combining the separation processes of vibration screening, magnetic separation and airflow separation, so as to realize the resource treatment of copper wire drawing sludge. The present invention controls the size and shape of the solid matter through crushing treatment, and then separates the sediment from the oil and water phase of the copper wire drawing sludge through pyrolysis treatment. After the sediment is treated by vibration screening to remove large particles, the magnetic metal is recovered through magnetic separation treatment; then the material is separated by airflow separation treatment to obtain copper powder and carbon powder, and the copper recovery rate reaches more than 64.78%, thereby realizing the resource utilization of valuable metals and effectively avoiding the waste of metal resources caused by incineration disposal. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 The present invention is a process flow chart of a method for resource utilization of copper wire drawing sludge. DETAILED DESCRIPTION

[0040] The present invention is further described below in conjunction with specific embodiments, but the embodiments do not limit the present invention in any form. Unless otherwise specified, the raw materials and reagents used in the embodiments of the present invention are conventionally purchased raw materials and reagents.

[0041] Example 1

[0042] A method for resource utilization of copper wire drawing sludge comprises the following steps:

[0043] S1, crushing the copper wire drawing sludge to be treated and passing it through a mesh sieve with a hole diameter of 120 mm;

[0044] S2, subjecting the material treated in step S1 to pyrolysis at a pyrolysis temperature of 375° C., and separating to obtain a pyrolysis liquid and a first sediment; and then subjecting the pyrolysis liquid to an oil-water separation treatment at 60° C. to obtain an oil phase and a water phase;

[0045] S3, vibrating and screening the first sediment of step S2 to remove large particles (particle size of 25.4 mm or more), and discharging to obtain a second sediment with a particle size of 1-400 mesh;

[0046] S4, subjecting the second sediment of step S3 to magnetic separation to separate the magnetic metal and the third sediment; the magnetic induction intensity in the magnetic separation is 350 mT;

[0047] S5, subjecting the third sediment of step S4 to airflow sorting treatment to separation to obtain copper powder and carbon powder; the airflow speed in the airflow sorting treatment is 1 m / s.

[0048] Example 2

[0049] A method for resource utilization of copper wire drawing sludge is basically the same as Example 1, except that: in step S2, the pyrolysis temperature in this embodiment is 300°C.

[0050] Example 3

[0051] A method for resource utilization of copper wire drawing sludge is basically the same as Example 1, except that: in step S2, the pyrolysis temperature in this embodiment is 450°C.

[0052] Example 4

[0053] A method for resource utilization of copper wire drawing sludge is basically the same as Example 2, except that: in step S2, the pyrolysis temperature in this embodiment is 500°C.

[0054] Example 5

[0055] A method for resource utilization of copper wire drawing sludge is basically the same as Example 1, except that: in step S5, the air flow velocity of the air flow sorting treatment in this embodiment is 1.2 m / s.

[0056] Example 6

[0057] A resource utilization system for copper wire drawing sludge, such as Figure 1 As shown, it includes a crushing unit, a pyrolysis unit, a vibration screening unit, a magnetic separation unit and an air flow separation unit connected in sequence; specifically,

[0058] A crushing unit is used to crush the copper wire drawing sludge to be processed;

[0059] A pyrolysis unit connected to the discharge end of the crushing unit, used for pyrolysis treatment of the material and separation of the oil phase, the water phase and the first sediment;

[0060] a vibration screening unit connected to the first sediment discharge end of the pyrolysis unit, and used to perform vibration screening on the first sediment to remove large particles and screen out a second sediment;

[0061] A magnetic separation unit is connected to the discharge end of the vibration screening unit and is used to perform magnetic separation on the second sediment to magnetically separate the magnetic metal and the third sediment;

[0062] The airflow separation unit is connected to the discharge end of the magnetic separation unit and is used for airflow separation of the third sediment to separate carbon powder and copper powder.

[0063] The resource utilization system of copper wire drawing oil sludge in this embodiment adopts the resource utilization method of copper wire drawing oil sludge in embodiment 1, specifically,

[0064] The crushing unit adopts a crusher, which is a low-speed, high-torque shredder that can crush materials, reduce the volume of materials, and premix materials; the discharge port of the crushing unit is equipped with a screen with an aperture of 120 mm.

[0065] The pyrolysis unit includes a heating system, a pyrolysis system, an oil-water separation system, a flue gas purification system, and an electrical control system; the heating system burns natural gas and non-condensable gas after pyrolysis purification; the flue gas purification system is used to perform rapid cooling, alkali spraying, demisting, and activated carbon adsorption in sequence to achieve flue gas purification and discharge; the pyrolysis system is a sequencing batch pyrolysis device, and the amount of material entering the furnace in each batch does not exceed 50% of the furnace volume; the nitrogen replacement procedure must be strictly followed before materials enter and exit the sequencing batch pyrolysis device.

[0066] The vibrating screening unit adopts a closed rotary vibrating screen made of 316L stainless steel; the closed rotary vibrating screen can effectively remove large particles, and the output material is a material with a particle size of 1-400 mesh.

[0067] The magnetic separation unit adopts a dry magnetic separator, the magnetic field is a permanent magnet series, and the average magnetic induction intensity of the cylinder surface is 350mT.

[0068] The airflow sorting unit operates under negative pressure without dust leakage; its operating airflow velocity is 1.0m / s.

[0069] Comparative Example 1

[0070] A method for resource utilization of copper wire drawing sludge comprises the following steps:

[0071] S1, crushing the copper wire drawing sludge to be treated and passing it through a mesh sieve with a hole diameter of 120 mm;

[0072] S2, the material treated in step S1 is subjected to acid dissolution treatment using 50% sulfuric acid, the ratio being 1:2;

[0073] S3, subjecting the material of step S2 to filter pressing to remove insoluble matter;

[0074] S4, separating the liquid material filtered in step S3 into oil;

[0075] S5, replacing the liquid after oil separation in step S4 with iron powder, and obtaining copper powder after filtering.

[0076] In this comparative example, 10 tons of copper wire drawing oil sludge samples were processed to obtain 0.216 tons of copper powder, and the copper recovery rate was 39.4%.

[0077] Performance Testing

[0078] The copper drawing sludge samples were processed by the resource utilization method of Examples 1-5 and Comparative Example 1, and 10 tons of materials were processed in batches. The results are shown in Table 1.

[0079] The copper wire drawing sludge sample is: copper wire drawing sludge from a cable factory; appearance: black sludge; calorific value: 34440.01 J / g; water content: 43.55%; solid content: 30.20%; oil content: 26.25%; copper content: 54800 mg / L; iron content: 26300 mg / L.

[0080] The calculation formula for iron recovery rate is: iron powder weight / (total sludge weight*iron content).

[0081] The calculation formula of copper recovery rate is: copper powder weight / (total weight of oil sludge*copper content).

[0082] Table 1

[0083]

[0084] The resource utilization method of the copper wire drawing sludge of the present invention can effectively separate oil, water, magnetic metal, crude copper powder and carbon powder from the copper wire drawing sludge, thereby realizing the resource treatment of the copper wire drawing sludge; the iron recovery rate of the method of the present invention reaches more than 76%, and the copper recovery rate reaches more than 64.78%.

[0085] Thus, it can be seen from Examples 1-4 that as the pyrolysis temperature increases, the recovery of iron and copper first increases and then remains unchanged, and the recovery rate of the oil phase decreases as the pyrolysis temperature increases.

[0086] Therefore, it can be seen from Examples 1 and 5 that when the air flow velocity of the air flow separation treatment is high, the recovery rate of the copper powder decreases, and a good separation effect of the copper powder and the carbon powder can be achieved by a specific air flow velocity.

[0087] In Comparative Example 1, the copper wire drawing oil sludge material is subjected to acid dissolution treatment and then replaced with iron powder, which not only consumes iron resources but also has a low copper recovery rate.

[0088] The above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A method for resource utilization of copper wire drawing sludge, characterized in that: The following steps are involved: S1, crushing the copper wire drawing sludge to be processed; S2, pyrolyzing the material after the treatment in step S1 in an anaerobic or anoxic environment, with the pyrolysis temperature being ≥300° C., and separating to obtain a pyrolysis liquid and a first sediment; S3, vibrating and screening the first sediment of step S2 to remove large particles, and discharging to obtain a second sediment with a particle size of 1-400 mesh; S4, subjecting the second sediment of step S3 to magnetic separation to obtain magnetic metal and third sediment; S5, performing airflow separation on the third sediment of step S4 to separate copper powder and carbon powder.

2. The resource utilization method of copper wire drawing sludge according to claim 1, characterized in that: In step S2, the pyrolysis temperature is 300-450°C.

3. The resource utilization method of copper wire drawing sludge according to claim 1, characterized in that: In step S5, the air flow velocity in the air flow sorting process is 0.6-1.2 m / s.

4. The resource utilization method of copper wire drawing sludge according to claim 1, characterized in that: In step S1, the crushed material is filtered through a sieve, and the sieve aperture is 50-200 mm.

5. The resource utilization method of copper wire drawing sludge according to claim 1, characterized in that: Step S2 also includes an oil-water separation process, wherein the oil-water separation process is to separate the pyrolysis liquid into an oil phase and a water phase.

6. The resource utilization method of copper wire drawing sludge according to claim 5, characterized in that: In step S2, the oil-water separation process is a condensation process, and the condensation temperature is lower than 60°C.

7. The resource utilization method of copper wire drawing sludge according to claim 1, characterized in that: In step S3, the particle size of the discharged second sediment is 100-300 meshes.

8. The resource utilization method of copper wire drawing sludge according to claim 1, characterized in that: In step S4, the magnetic induction intensity in the magnetic separation process is 100 to 600 mT.

9. The resource utilization method of copper wire drawing sludge according to claim 1, characterized in that: The copper wire drawing sludge has a calorific value of 30000-40000 J / g, a water content of 40-50%, a solid content of 25-35%, an oil content of 20-30%, a copper content of 50000-60000 mg / L, and an iron content of 20000-30000 mg / L.

10. A resource utilization system for copper wire drawing sludge, characterized in that: include: A crushing unit is used to crush the copper wire drawing sludge to be processed; A pyrolysis unit connected to the discharge end of the crushing unit, used for pyrolysis treatment of the material and separation of pyrolysis liquid and first sediment; A vibration screening unit connected to the first sediment discharge end of the pyrolysis unit, used to perform vibration screening on the first sediment to remove large particles and screen out a second sediment with a particle size of 1-400 mesh; A magnetic separation unit is connected to the discharge end of the vibration screening unit and is used to perform magnetic separation on the second sediment to magnetically separate the magnetic metal and the third sediment; The airflow separation unit is connected to the discharge end of the magnetic separation unit and is used for airflow separation of the third sediment to separate the carbon powder and the copper powder.

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