CN115846046B - Metal slag sorting method - Google Patents

Abstract

The present invention discloses a metal slag sorting method, which relates to the technical field of metal recovery and treatment, and comprises the following steps: primary screening of metal slag to screen out large pieces of metal slag and crush them to form qualified metal slag output; primary screening, crushing and magnetic separation of qualified metal slag, including: magnetically attracting qualified metal slag to obtain part of magnetic block metal in metal slag, screening the metal slag after magnetic attraction, storing the screened metal slag in a storage bin, crushing the block metal slag that cannot pass the screening, and storing the crushed metal slag in the storage bin; when the metal slag stored in the storage bin is magnetic metal slag, selecting dry rod mill for dry-wet dual-purpose rod mill, and processing the metal slag output from the storage bin to a particle size that meets the requirements through the dry rod mill of the dry-wet dual-purpose rod mill; etc. The present application can solve the problem that the current metal slag sorting method is single and cannot take into account both magnetic and non-magnetic metal slag.

Description

Metal slag separation method

Technical Field

The invention relates to the technical field of metal recovery and processing, and in particular to a metal slag separation method.

Background Art

The metal content in metal slag generally needs to be greater than 10% to be worth sorting and recycling. Typical examples include steel slag, copper slag, vanadium slag, etc., while blast furnace slag has low metal content and is not worth sorting and recycling.

At present, most of the metal slag sorting methods are divided into two methods: one method is for magnetic slag, which generally adopts steps such as crushing, screening, grinding, and magnetic separation. The sorting process of magnetic slag is relatively mature, simple, low in production cost, and large in processing capacity. The difference between the methods generally lies in the number and sequence of crushing, screening, grinding, and magnetic separation, as well as whether it is closed-loop processing. The other method is for non-magnetic slag. There are many sorting methods for non-magnetic slag, including dry method, wet method, gravity separation, and magnetic separation. The first half of the process generally adopts crushing, screening, and grinding processes similar to the magnetic slag sorting method. In the second half of the process, since the metal slag is non-magnetic or weakly magnetic, gravity separation, strong magnetic separation, and metal detection are used. The sorting method of non-magnetic slag is relatively long, the process is cumbersome, the production cost is high, and the processing capacity is low.

The metal slag sorting system in the prior art firstly does not take into account both magnetic and non-magnetic metal slag. Secondly, the process route of non-magnetic metal slag is either too simple, with low processing capacity and poor environmental protection effect, or the equipment technology used in the process route is immature and needs to rely on imports. There are also process routes with low yields, resulting in the waste of some metal resources. Therefore, a metal slag sorting system is needed that can take into account the sorting of magnetic and non-magnetic metal slag at the same time, thereby reducing costs and making the metal slag sorting system multifunctional.

Key Terms Explanation

Metal slag: refers to the slag containing a small amount of metal remaining after the metal is extracted through the smelting process.

Magnetic and non-magnetic: refers to whether the metal in the metal slag can be separated by a magnetic separator.

Dry method and wet method: refers to whether circulating water is used for treatment in the metal slag sorting system.

Slag slurry: refers to the mixture of slag and water when the metal slag adopts the wet treatment system.

Tailings: refers to the remaining slag after metal is extracted from metal slag.

Mud cake: refers to the tailings after wet treatment.

Summary of the invention

In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a metal slag sorting method, which can solve the problem that the current metal slag sorting method is single and cannot take into account both magnetic and non-magnetic metal slag.

The specific technical solution of the embodiment of the present invention is:

A metal slag sorting method, the metal slag sorting method comprising the following steps:

The metal slag is subjected to primary screening to screen out the large pieces of metal slag and crush them to form qualified metal slag output;

The qualified metal slag is subjected to a screening, crushing and magnetic separation treatment, including: magnetically attracting the qualified metal slag to obtain part of the magnetic block metal in the metal slag, screening the metal slag after magnetic attraction, storing the screened metal slag in a storage bin, crushing the block metal slag that cannot pass the screening, and storing the crushed metal slag in the storage bin;

When the metal slag stored in the storage bin is magnetic metal slag, the dry-method rod mill is selected as the wet-dry dual-purpose rod mill, and the metal slag output from the storage bin is processed to a particle size that meets the requirements by the dry-method rod mill of the wet-dry dual-purpose rod mill;

When the metal slag stored in the storage bin is non-magnetic metal slag, the wet and dry dual-purpose rod mill is selected as a wet rod mill, and the metal slag output from the storage bin is processed to a particle size that meets the requirements by the wet rod mill of the wet and dry dual-purpose rod mill;

The metal slag treated by the dry-wet dual-purpose rod mill using the dry rod mill is dry-treated, including: using a second vibrating screen to screen the metal slag treated by the dry-wet dual-purpose rod mill using the dry rod mill, using a second magnetic belt machine located above the second vibrating screen to select the magnetic block metal on the second vibrating screen, and the remaining material on the second vibrating screen after being selected by the second magnetic belt machine is screened, crushed and magnetically separated again;

The metal slag treated by a wet and dry dual-purpose rod mill using a wet rod mill is wet-treated, including: using a water-washing vibrating screen to screen the metal slag treated by the wet and dry dual-purpose rod mill using a wet rod mill to obtain block metal; the material under the water-washing vibrating screen is separated into overflow and sediment by a spiral classifier; the overflow is treated by a shaking table to obtain metal powder, and the tailings formed after the shaking table treatment are input to a sludge treatment system for treatment; the sediment is secondary ground by a wet ball mill to obtain a ball-milled product; the ball-milled product is screened by a cylindrical screen to obtain granular metal from the screen of the cylindrical screen, and the material under the screen of the cylindrical screen is sent to the shaking table for further treatment.

Preferably, the qualified metal slag is conveyed by a belt conveyor, and during the conveying process, part of the magnetic metal in the metal slag on the belt conveyor is selected by a first magnetic belt machine located above the belt conveyor;

The blocky metal slag that cannot pass the screening is crushed by a crusher, wherein the crusher is a hydraulically protected jaw crusher, and the particle size of the metal slag after being crushed by the crusher is substantially less than or equal to 70 mm.

Preferably, the dry treatment of the metal slag treated by the dry and wet dual-purpose rod mill using the dry rod mill also includes: magnetically attracting the metal slag passing through the second vibrating screen through a dry magnetic separator to obtain magnetic powdered metal.

Preferably, in the step of primary screening the metal slag to screen out large pieces of metal slag and crush them to form qualified metal slag output, the metal slag is loaded into a feeding station with a tiltable grid screen by a front-end loader or a grab crane, the large pieces of metal slag are screened out by the tiltable grid screen, and the large pieces of metal slag are crushed manually to form qualified metal slag output; in this process, large pieces of metal are screened by the tiltable grid screen.

Preferably, the spiral classifier is used to separate the material into overflow and sediment with a particle size of less than or equal to 10 mm;

The wet ball mill is a wet grid-type ball mill, the input particle size of the wet grid-type ball mill is less than or equal to 10 mm, and the output particle size of the wet grid-type ball mill is less than or equal to 0.8 mm.

Preferably, in the step of subjecting the qualified metal slag to a screening, crushing and magnetic separation treatment, the particle size of the metal slag stored in the storage bin after crushing is less than or equal to 70 mm;

The input particle size of the wet and dry dual-purpose rod mill is less than or equal to 70 mm, and the output particle size of the wet and dry dual-purpose rod mill is less than or equal to 5 mm.

Preferably, the tailings are fed into a sludge treatment system for treatment, comprising:

Add chemicals to the tailings for harmless treatment;

The harmlessly treated tailings are fed into the cyclone;

The underflow of the cyclone is transported to a dewatering screen for dewatering to obtain coarse tailings.

Preferably, inputting the tailings into the sludge treatment system for treatment also includes:

Concentrating the overflow of the cyclone and the undersize liquid of the dewatering screen;

The underflow formed during the concentration process is compressed to form a mud cake;

The overflow formed during the concentration process is input into the sedimentation tank for sedimentation to separate the clean water and sludge.

Preferably, the clean water separated from the sedimentation tank is used to wet-treat the metal slag treated by a wet and dry dual-purpose rod mill using a wet rod mill.

Preferably, during the process of conveying the qualified metal slag by the belt conveyor, larger pieces of lump metal are screened out by manual selection.

The technical solution of the present invention has the following significant beneficial effects:

1. The present application takes into account the processing of magnetic metal slag and non-magnetic metal slag. By using the same processing line, the adaptability of the product under different market conditions can be achieved by switching between the magnetic metal slag dry processing system and the non-magnetic metal slag wet processing system.

2. In the present application, a closed-loop treatment is adopted for the magnetic metal slag, and the metal slag can be ground by repeated rod grinding to fully separate the metal and the slag, thereby improving the metal purity and the metal recovery rate.

3. In the present application, a combined process of crushing, rod milling and ball milling is adopted for non-magnetic metal slag. The crushing process can solve the problem of uneven particle size. The rod mill can process the metal slag with a larger capacity, extract part of the metal therein, and reduce the production capacity pressure of subsequent ball milling. The ball mill can further separate the metal and slag to improve the yield and purity.

4. In the present application, a spiral classifier is used in the roughing stage of non-magnetic metal slag, which has the advantage of large processing capacity.

5. In the present application, a shaking table is used in the concentration stage of non-magnetic metal slag, thereby improving the metal recovery rate and avoiding waste of resources.

With reference to the following description and drawings, specific embodiments of the present invention are disclosed in detail, indicating the manner in which the principles of the present invention can be adopted. It should be understood that the embodiments of the present invention are not limited in scope. Features described and/or shown for one embodiment can be used in one or more other embodiments in the same or similar manner, combined with features in other embodiments, or replace features in other embodiments.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings described herein are only for explanation purposes and are not intended to limit the scope of the present invention in any way. In addition, the shapes and proportional dimensions of the various components in the figures are only schematic, used to help understand the present invention, and are not specifically limited to the shapes and proportional dimensions of the various components of the present invention. Those skilled in the art can select various possible shapes and proportional dimensions to implement the present invention according to the teachings of the present invention.

FIG1 is a schematic diagram of a metal slag separation system according to an embodiment of the present invention;

FIG. 2 is a flow chart showing the steps of the metal slag separation method according to an embodiment of the present invention.

DETAILED DESCRIPTION

The details of the present invention can be more clearly understood by combining the accompanying drawings and the description of the specific embodiments of the present invention. However, the specific embodiments of the present invention described herein are only used for the purpose of explaining the present invention and cannot be understood as limiting the present invention in any way. Under the guidance of the present invention, technicians can conceive of any possible variations based on the present invention, which should be regarded as belonging to the scope of the present invention. It should be noted that when an element is referred to as "disposed on" another element, it can be directly on the other element or there can also be a central element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a central element at the same time. The terms "installed", "connected" and "connected" should be understood in a broad sense, for example, it can be a mechanical connection or an electrical connection, or it can be the internal communication of two elements, it can be directly connected, or it can be indirectly connected through an intermediate medium. For ordinary technicians in the field, the specific meanings of the above terms can be understood according to the specific circumstances. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are only for illustrative purposes and do not represent the only implementation method.

Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by those skilled in the art to which the present application belongs. The terms used herein in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and/or" used herein includes any and all combinations of one or more of the related listed items.

There are both low-value-added magnetic slag and non-magnetic slag in smelting enterprises. For example, some enterprises will produce magnetic metals for a period of time and non-magnetic metals for another period of time according to market conditions. This requires the metal slag sorting system and sorting method to be able to adapt to different metal slags. Because some magnetic slags have low added value, if non-magnetic metal slag production lines are used to process magnetic slag, the production cost will be high, resulting in losses.

In order to solve the problem that the current metal slag sorting method is single and cannot take into account both magnetic and non-magnetic metal slag, a metal slag sorting system and sorting method are proposed in the present application. Figure 1 is a schematic diagram of the metal slag sorting system in an embodiment of the present invention. As shown in Figure 1, the metal slag sorting system may include: a feeding system, a primary screening, crushing and magnetic separation system, a primary grinding system, a magnetic metal slag dry treatment system, a non-magnetic metal slag wet treatment system and a sludge treatment system.

As shown in FIG1 , the feeding system is used to load the metal slag and perform primary screening, so as to screen out the large pieces of metal slag and crush them, and form qualified metal slag output. As feasible, the feeding system may include: a front-end loader and a feeding station with a tilting grid screen. The front-end loader can load the metal slag onto the tilting grid screen of the feeding station, and the tilting grid screen can screen out the large pieces of metal slag; the metal slag passing through the tilting grid screen forms qualified metal slag. The front-end loader can also be replaced by a grab crane. The large pieces of metal slag on the tilting grid screen can be turned over to the side by the tilting grid screen, and then crushed by manual means using a drop hammer crushing method, and the crushed metal slag is then loaded onto the tilting grid screen of the feeding station. The large pieces of metal on the tilting grid screen can be directly screened out. A collecting device can be provided below the tilting grid screen to store the metal slag after the initial screening by the tilting grid screen. A vibrating feeder is provided at the outlet of the collecting device to output the metal slag in the collecting device.

As shown in Figure 1, the primary screening, crushing and magnetic separation system cooperates with the outlet below the tiltable grid screen, such as with the vibrating feeder at the outlet of the collecting device, to receive the outputted metal slag. The primary screening, crushing and magnetic separation system is used to magnetically attract qualified metal slag to obtain part of the magnetic metal in the metal slag, screen the magnetically attracted metal slag, store the screened metal slag in a storage bin, and crush the blocky metal slag that cannot pass the screening, and store the crushed metal slag in the storage bin.

The primary screening, crushing and magnetic separation system may include: a belt conveyor for conveying the qualified metal slag, the belt conveyor may be located below the outlet of the vibrating feeder; a first magnetic machine located above the belt conveyor, the first magnetic machine is used to select part of the magnetic metal in the metal slag on the belt conveyor; a first vibrating screen located at the outlet of the belt conveyor; a crusher, which is used to crush the block metal slag that cannot pass through the first vibrating screen; the storage bin, whose inlet receives the metal slag after passing through the first vibrating screen and the metal slag crushed by the crusher. The first magnetic machine is used to select larger pieces of magnetic metal from the metal slag on the belt conveyor, and the missed block metals can be selected manually.

Furthermore, the crusher is a hydraulically protected jaw crusher, and the crushing performance of the hydraulically protected jaw crusher is to be able to crush the blocky metal slag to a particle size less than or equal to 70 mm. Since the dry and wet dual-purpose rod mill in the subsequent steps has strict requirements on the feed particle size, it must not be greater than 70 mm, otherwise the grinding medium steel rods are prone to disorder. Therefore, it is necessary to achieve the purpose of coarse crushing in a single screening, crushing and magnetic separation system. Since the metal slag contains large pieces of metal, its particle size may be greater than 70 mm, it is necessary to adopt a hydraulically protected jaw crusher. When its bite force is greater than a certain level, the hydraulic protection will automatically let the large pieces of metal go, and will not force crushing, thereby avoiding damage to the jaw crusher.

As shown in FIG1 , the primary grinding system may include: a wet and dry rod mill, which can receive the metal slag output from the storage bin. When the metal slag output from the storage bin is magnetic metal slag, the wet and dry rod mill uses a dry rod mill; when the metal slag output from the storage bin is non-magnetic metal slag, the wet and dry rod mill uses a wet rod mill. The inlet of the wet and dry rod mill can be matched and docked with the outlet of the storage bin. The feed particle size of the wet and dry rod mill is less than or equal to 70 mm, and the discharge particle size of the wet and dry rod mill is less than or equal to 5 mm. The wet and dry rod mill can grind the metal slag to the corresponding particle size.

As shown in Figure 1, the feed inlet of the magnetic metal slag dry processing system can be matched and docked with the outlet of the wet and dry dual-purpose rod mill. The magnetic metal slag dry processing system can include: a second vibrating screen, which is used to screen the metal slag that has been processed by the wet and dry dual-purpose rod mill using the dry rod mill; a second magnetic machine located above the second vibrating screen, which is used to select the magnetic block metal on the second vibrating screen, and the primary screening and crushing magnetic separation system receives the remaining material on the second vibrating screen after being selected by the second magnetic machine. The inlet of the second vibrating screen can be matched and docked with the outlet of the wet and dry dual-purpose rod mill.

As a feasible method, the magnetic metal slag dry treatment system may further include: a dry magnetic separator, which is used to magnetically absorb the metal slag passing through the second vibrating screen to obtain magnetic powdered metal. For example, the magnetic powdered metal may include slag iron powder. The metal slag remaining after magnetic absorption by the dry magnetic separator forms tailings.

As shown in FIG1 , the feed inlet of the non-magnetic metal slag wet treatment system can be matched and docked with the outlet of the wet and dry dual-purpose rod mill. The non-magnetic metal slag wet treatment system can include: a water-washing vibrating screen, which is used to screen the metal slag treated by the wet and dry dual-purpose rod mill using the wet rod mill, and obtain block metal from the water-washing vibrating screen; a spiral classifier, whose inlet receives the material under the screen of the water-washing vibrating screen, and the spiral classifier is used to separate the material into overflow and sediment; a shaking table, which is used to treat the overflow to obtain metal powder, and the tailings are formed after treatment and input to the sludge treatment system; a wet ball mill, whose inlet receives the sediment, and the wet ball mill is used to perform secondary grinding on the sediment to obtain ball milling products; a cylindrical screen, whose inlet is connected to the outlet of the wet ball mill, and the cylindrical screen screens the ball milling products to obtain granular metal from the screen of the cylindrical screen, and the material under the screen of the cylindrical screen is transported to the shaking table. The inlet of the water-washing vibrating screen can be matched and docked with the outlet of the wet and dry rod mill. The sediment separated by the spiral classifier can first enter the buffer bin for storage. The inlet of the shaking table can be connected with the overflow outlet of the spiral classifier and the outlet under the cylindrical screen. The inlet of the wet ball mill can be matched and docked with the outlet of the buffer bin, and the wet ball mill is a wet grid-type ball mill. The feed particle size of the wet grid-type ball mill is less than or equal to 10mm, and the discharge particle size of the wet grid-type ball mill is less than or equal to 0.8mm. The wet grid-type ball mill can achieve the purpose of fine final grinding particle size. The above-mentioned non-magnetic metal slag wet treatment system solves the current problem of low processing capacity for non-magnetic metal slag, and can achieve the purpose of selection, improve the grade of recovered metals, and can fully recover the useful metals therein to avoid waste.

For non-magnetic metal slag, this application adopts a hydraulic protection crusher for coarse crushing, followed by wet rod milling with a dry and wet dual-purpose rod mill, and then a combined process of ball milling with a wet ball mill. The hydraulic protection crusher has the largest production capacity, the dry and wet dual-purpose rod mill has the second largest production capacity, and the wet ball mill has the smallest production capacity. Each time a device is passed, some metal can be sorted out, thereby reducing the pressure on the subsequent process equipment, which helps to increase production capacity. The combination of a spiral classifier and a shaking table is adopted. The spiral classifier has a large production capacity and is suitable for front-end processing and rough processing. The shaking table has a low production capacity and a high metal selection rate, which is suitable for back-end processing and processing after grinding. Moreover, both equipment have the advantages of low cost and easy maintenance.

As a feasible method, the outlet of the dry-wet dual-purpose rod mill can be connected to the inlet of the magnetic metal slag dry processing system and the non-magnetic metal slag wet processing system through a rotary feeder, and the rotary feeder can facilitate switching between the magnetic metal slag dry processing system and the non-magnetic metal slag wet processing system.

As a feasible method, the sludge treatment system may include: a cyclone, which is used to receive the tailings after harmless treatment; a dewatering screen connected to the bottom flow outlet of the cyclone. The bottom flow output by the cyclone is processed by the dewatering screen to obtain coarse tailings, and the undersize liquid is output to the outside at the same time. The overflow outlet of the cyclone also outputs the overflow to the outside at the same time. The sludge treatment system may also include: a concentration unit, which can be connected to the overflow outlet of the cyclone and the undersize liquid outlet of the dewatering screen; a sedimentation tank, which can be connected to the overflow outlet of the concentration unit; and a compression unit, which is connected to the bottom flow outlet of the concentration unit. The concentration unit can be a concentration tank or a concentration tower, in which drugs are added for flocculation and sedimentation. The overflow of the concentration unit enters the sedimentation tank, and the bottom flow of the concentration unit enters the compression unit for compression and filtration to produce mud cakes, which are transported to the finished product warehouse for storage and transportation by a forklift, and the return water generated during the compression and filtration process enters the sedimentation tank. The compression unit can be a plate and frame filter press, a vacuum belt filter press, a vacuum disc filter, a cylindrical vacuum filter, etc. The clean water outlet of the sedimentation tank can be connected to the non-magnetic metal slag wet treatment system to supply water to the non-magnetic metal slag wet treatment system. The sludge outlet of the sedimentation tank can be connected to the inlet of the cyclone to re-enter the sludge treatment system. In the above manner, an environmentally friendly and industrialized treatment route is adopted for the tailings, avoiding pollution caused by heavy metal spillage.

FIG. 2 is a flow chart of the steps of the metal slag separation method in an embodiment of the present invention. As shown in FIG. 2 , the metal slag separation method in the present application may specifically include the following steps:

S101: The metal slag is subjected to primary screening to screen out the large pieces of metal slag and crush them to form qualified metal slag for output.

The above-mentioned metal slag can be divided into magnetic and non-magnetic metal slag. Magnetic metal slag refers to the majority of known metal slags being magnetic metal slag, and magnetic metal slag treatment is mainly carried out. Non-magnetic metal slag refers to the majority of known metal slags being non-magnetic metal slag, and non-magnetic metal slag treatment is mainly carried out.

In the above steps, the metal slag can be loaded into a feed station with a tilting grid screen by a front-end loader or a grab crane, and the large pieces of metal slag with a particle size greater than 200 mm can be screened out by the tilting grid screen, and the large pieces of metal slag can be crushed manually to form qualified metal slag output, and the qualified metal slag is the metal slag with a particle size less than 200 mm. In this process, large pieces of metal are screened by the tilting grid screen. The large pieces of metal slag on the tilting grid screen can be turned over to the side by turning the tilting grid screen, and then crushed by a drop hammer crushing method manually, and the crushed metal slag is then loaded onto the tilting grid screen of the feed station. The large pieces of metal with a particle size greater than 200 mm on the tilting grid screen can be directly screened out. A collecting device can be provided below the tilting grid screen, and the qualified metal slag screened out by the tilting grid screen is output to the collecting device.

S102: Perform a screening, crushing and magnetic separation process on the qualified metal slag. The screening, crushing and magnetic separation process may include: magnetically attracting the qualified metal slag to obtain some magnetic block metal in the metal slag, screening the metal slag after magnetic attraction, storing the screened metal slag in a storage bin, crushing the block metal slag that cannot pass the screening, and storing the crushed metal slag in the storage bin.

In the above steps, the qualified metal slag can be conveyed by a belt conveyor. During the conveying process, part of the magnetic metal in the metal slag on the belt conveyor is selected by the first magnetic machine located above the belt conveyor, and the particle size of some of the magnetic block metals in the metal slag obtained by magnetic attraction is generally between 80mm and 200mm. At the same time, the missed block metal can also be selected by manual screening, and the particle size of the block metal is generally between 80mm and 200mm. Preferably, the block metal slag that cannot pass the screening is crushed by a crusher, and the particle size of the block metal slag that cannot pass the screening is generally between 70mm and 200mm. The crusher can be a hydraulically protected jaw crusher, and the particle size of the metal slag after being crushed by the crusher is mostly less than or equal to 70mm, and the particle size of the partially crushed metal slag can reach 5mm. Since the dry and wet dual-purpose rod mill in the subsequent steps has strict requirements on the particle size of the feed material, which must not be larger than 70 mm, otherwise the grinding medium steel rods are very likely to be disordered, the particle size of the metal slag stored in the storage bin after crushing is basically less than or equal to 70 mm.

S103: When the metal slag stored in the storage bin is magnetic metal slag, the dry-method rod mill is selected as the dry-method rod mill, and the metal slag output from the storage bin is processed to a particle size that meets the requirements by the dry-method rod mill of the dry-method rod mill. In this process, the dry-method rod mill can process the output particle size to be less than or equal to 5 mm.

S104: When the metal slag stored in the storage bin is non-magnetic metal slag, the wet and dry dual-purpose rod mill is selected as a wet rod mill, and the metal slag output from the storage bin is processed to a particle size that meets the requirements by the wet rod mill of the wet and dry dual-purpose rod mill. In this process, the wet and dry dual-purpose rod mill can process most of the output particle size to be less than or equal to 5mm, but it should be noted that there will still be blocky metal residues with larger particle sizes.

S105: dry-treating the metal slag treated by the dry-wet dual-purpose rod mill using the dry rod mill. The dry-treating may include: screening the metal slag treated by the dry-wet dual-purpose rod mill using the second vibrating screen, selecting the magnetic block metal on the second vibrating screen using the second magnetic belt machine located above the second vibrating screen, and performing a screening, crushing and magnetic separation treatment on the remaining material on the second vibrating screen after being selected by the second magnetic belt machine, wherein the particle size of the small amount of remaining material is greater than 10 mm.

Furthermore, the dry treatment may also include: subjecting the metal slag that has passed through the second vibrating screen to magnetic attraction by a dry magnetic separator to obtain magnetic powdered metal, and the metal slag after magnetic attraction forms tailings.

S106: wet-treating the metal slag treated by the wet and dry dual-purpose rod mill using the wet rod mill. The wet treatment may include: using a water-washing vibrating screen to screen the metal slag treated by the wet and dry dual-purpose rod mill using the wet rod mill to obtain block metal; separating the material under the water-washing vibrating screen into overflow and sediment through a spiral classifier; using a shaking table to treat the overflow to obtain metal powder, the particle size of the metal powder is less than or equal to 2mm, and the tailings formed after the shaking table treatment are input to the sludge treatment system for treatment; using a wet ball mill to perform secondary grinding on the sediment to obtain a ball milling product; screening the ball milling product through a cylindrical screen to obtain granular metal from the screen of the cylindrical screen, the particle size of the granular metal is between 2mm and 20mm; and transferring the material under the screen of the cylindrical screen to the shaking table for further treatment. Similarly, the undersize material of the drum screen is processed by the shaking table to obtain metal powder, the particle size of the metal powder is less than or equal to 2 mm, and the tailings formed after the shaking table treatment are input into the sludge treatment system for treatment.

In the above steps, the block metal obtained by screening the metal slag treated by the wet and dry dual-purpose rod mill using the wet rod mill using the water-washed vibrating screen is a block metal with a larger particle size, generally with a particle size of 20mm to 80mm. The particle size of the material under the water-washed vibrating screen can be less than or equal to 20mm. The spiral classifier is used to separate the material into overflow and sediment with a particle size of less than or equal to 10mm. The wet ball mill is a wet grid-type ball mill, the feed particle size of the wet grid-type ball mill is less than or equal to 10mm, and most of the discharge particle sizes of the wet grid-type ball mill can be less than or equal to 0.8mm. The purpose of fine final grinding particle size can be achieved by the wet grid-type ball mill.

As a feasible method, the sludge treatment system can treat the tailings harmlessly, then dehydrate, thicken, filter press, form mud cake, and then sell it to the corresponding factory for recycling. The sewage is then returned to the wet treatment for recycling. The tailings are input into the sludge treatment system for treatment, which can specifically include the following steps:

Add chemicals to the tailings for harmless treatment. Since the toxic heavy metal in the tailings is usually Cr ⁶⁺ , FeSO ₄ can be added to reduce Cr ⁶⁺ to harmless Cr ³⁺ .

The harmlessly treated tailings are fed into the hydrocyclone. The harmlessly treated tailings can be fed into the hydrocyclone through a mortar pump, and the hydrocyclone forms an underflow and overflow.

The underflow of the cyclone is transported to a dewatering screen for dewatering to obtain coarse tailings.

The overflow of the hydrocyclone and the underflow of the dewatering screen are concentrated, for example, the overflow of the hydrocyclone and the underflow of the dewatering screen can be first input to the turbid water treatment, and then input to the concentration tank or concentration tower dosing and other concentration units for flocculation and sedimentation. At the same time, the concentration unit forms overflow and underflow.

The bottom flow formed during the concentration process is compressed to form a mud cake, which is then transported by a forklift to the finished product warehouse for storage and transportation. The return water formed during the compression process enters the sedimentation tank.

The overflow formed during the concentration treatment is input into the sedimentation tank for sedimentation and separation of clean water and sludge. The clean water separated in the sedimentation tank is used to wet-treat the metal slag treated by the wet and dry dual-purpose rod mill using the wet rod mill. The sludge separated by the sedimentation tank can be re-entered into the sludge treatment system for treatment. The replenishment water in the sedimentation tank can come from the turbid circulating water, thereby ensuring that the wastewater is not discharged and the existing wastewater in the factory is effectively utilized.

The present application may have the following beneficial effects: 1. The present application takes into account the treatment of magnetic metal slag and non-magnetic metal slag. By using the same processing line, the adaptability of the product under different market conditions can be achieved by switching between the magnetic metal slag dry treatment system and the non-magnetic metal slag wet treatment system. 2. In the present application, closed-loop treatment is adopted for magnetic metal slag, and the metal slag can be ground by repeated rod milling to fully separate the metal and slag, improve the metal purity, and improve the metal recovery rate. 3. In the present application, a combined process of crushing treatment, rod milling treatment and ball milling treatment is adopted for non-magnetic metal slag. The crushing process can solve the problem of uneven particle size. The rod mill can process the metal slag with a larger capacity, extract some of the metal, and reduce the production capacity pressure of subsequent ball milling. The ball mill can further separate the metal and slag, and improve the recovery rate and purity. 4. In the present application, a spiral classifier is used for the roughing stage of non-magnetic metal slag, which has the advantage of large processing capacity. 5. In the present application, a shaking table is used for the concentrating stage of non-magnetic metal slag, so that the metal recovery rate can be improved without wasting resources. 6. The process of dewatering screen plus concentration unit plus compression unit is adopted for the treatment of tailings in this application, which can not only realize large-scale treatment of tailings, but also ensure that sewage does not overflow and does not cause pollution.

All articles and references disclosed, including patent applications and publications, are incorporated herein by reference for various purposes. The term "consisting essentially of ... " describing a combination should include determined elements, ingredients, parts or steps and other elements, ingredients, parts or steps that do not substantially affect the basic novel features of the combination. The use of the terms "comprising" or "including" to describe the combination of elements, ingredients, parts or steps here also contemplates the implementation method consisting essentially of these elements, ingredients, parts or steps. Here, by using the term "may", it is intended to illustrate that any attribute described that "may" includes is optional. Multiple elements, ingredients, parts or steps can be provided by a single integrated element, ingredient, part or step. Alternatively, a single integrated element, ingredient, part or step can be divided into separate multiple elements, ingredients, parts or steps. The disclosure "one" or "one" used to describe an element, ingredient, part or step is not said to exclude other elements, ingredients, parts or steps.

Each embodiment in this specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between the embodiments can be referred to each other. The above embodiments are only for illustrating the technical concept and features of the present invention. The purpose is to enable people familiar with this technology to understand the content of the present invention and implement it accordingly, and it cannot be used to limit the scope of protection of the present invention. Any equivalent changes or modifications made according to the spirit of the present invention should be covered within the scope of protection of the present invention.

Claims (5)

1. A slag separation method, characterized in that the slag separation method comprises the steps of:

Primary screening is carried out on the metal slag so as to screen out and crush massive metal slag, and qualified metal slag is formed and output;

carrying out primary screening, crushing and magnetic separation treatment on qualified metal slag, wherein the method comprises the following steps: magnetically attracting qualified metal slag to obtain partial magnetic block metal in the metal slag, screening the metal slag subjected to magnetic attraction, storing the screened metal slag in a storage bin, crushing the block metal slag which cannot pass through the screening, storing the crushed metal slag in the storage bin, and storing the crushed metal slag in the storage bin with the granularity of the metal slag less than or equal to 70mm;

When the metal slag stored in the storage bin is magnetic metal slag, selecting a dry rod mill for the dry-wet rod mill, and processing the metal slag output by the storage bin to a particle size meeting the requirement through the dry rod mill of the dry-wet rod mill;

When the metal slag stored in the storage bin is non-magnetic metal slag, a wet rod mill is selected as a dry-wet rod mill, and the metal slag output by the storage bin is processed to a particle size meeting the requirement through the wet rod mill of the dry-wet rod mill;

The metal slag treated by the dry and wet rod mill of the selected dry rod mill is subjected to dry treatment, which comprises the following steps: screening the metal slag treated by the dry-wet rod mill by using a second vibrating screen, and screening the magnetic block metal on the second vibrating screen by using a second magnetic machine positioned above the second vibrating screen, wherein the residual material on the second vibrating screen after being screened by the second magnetic machine is subjected to screening, crushing and magnetic separation treatment again;

Wet processing the metal slag processed by the wet rod mill, comprising the following steps: screening the metal slag treated by the wet and dry rod mill by using a washing vibrating screen to obtain massive metal; separating the material sieved by the washing vibrating screen into overflow and sand sediment by a spiral classifier, wherein the spiral classifier is used for separating the material into overflow and sand sediment with granularity less than or equal to 10 mm; treating overflow by using a shaking table to obtain metal powder, and inputting tailings formed after the shaking table treatment into a sludge treatment system for treatment; carrying out secondary grinding on the sand sediment by utilizing a wet ball mill to obtain a ball milling product, wherein the wet ball mill is a wet lattice type ball mill, the feeding granularity of the wet lattice type ball mill is less than or equal to 10mm, and the discharging granularity of the wet lattice type ball mill is less than or equal to 0.8mm; screening the ball-milling product through a cylindrical screen, obtaining granular metal from the screen of the cylindrical screen, and conveying the undersize material of the cylindrical screen to the shaking table for further treatment;

Wherein, the granularity of the feed of the dry-wet dual-purpose rod mill is less than or equal to 70mm, and the granularity of the discharge of the dry-wet dual-purpose rod mill is less than or equal to 5mm;

inputting tailings into a sludge treatment system for treatment comprises:

adding a drug into tailings for innocent treatment;

Inputting the tailings subjected to innocent treatment into a cyclone;

delivering the underflow of the cyclone to a dewatering screen for dewatering to obtain coarse-grain tailings;

concentrating overflow of the cyclone and undersize liquid of the dewatering screen;

Compressing the bottom flow formed during concentration treatment to form mud cakes;

and inputting overflow formed during concentration treatment into a sedimentation tank for sedimentation and separation of clear water and sludge, and carrying out wet treatment on the metal slag treated by the wet-dry rod mill by using clear water separated by the sedimentation tank.

2. The method according to claim 1, wherein the qualified metal slag is conveyed by a belt conveyor, and during conveying, part of the magnetic metal in the metal slag on the belt conveyor is selected by a first belt magnetic machine positioned above the belt conveyor;

and crushing the massive metal slag which cannot pass through the screening by using a crusher, wherein the crusher is a hydraulic protection jaw crusher, and the granularity of the metal slag crushed by the crusher is basically less than or equal to 70mm.

3. The method of claim 1, wherein the dry-process treatment of the slag treated by the dry-wet dual-purpose rod mill selected for dry rod milling, further comprises: and magnetically attracting the metal slag passing through the second vibrating screen through a dry magnetic separator to obtain magnetic powdery metal.

4. The method of claim 1, wherein in the step of primarily screening the metal slag to screen out and crush the large metal slag and form a qualified metal slag output, the metal slag is loaded into a loading station having a tiltable screen by a front end loader or a grab crane, the large metal slag is screened out by the tiltable screen, and the large metal slag is crushed by a manual method to form the qualified metal slag output; in this process, large pieces of metal are obtained by sieving through the tiltable grid.

5. The method for separating metal slag according to claim 1, wherein the qualified metal slag is conveyed by a belt conveyor, and larger blocks of metal are screened by manual selection.