CN116116575A - Process for improving slag magnetic iron grade and material adding equipment thereof - Google Patents

Abstract

The invention provides a process for improving the grade of iron in slag magnetic separation and its material addition equipment, S1, material processing: crushing and drying gypsum; S2, material addition: adding gypsum and molten slag after S1 processing to Mixing reaction in the slag bag; S3, slow cooling of the slag bag: after the S2 material is added, the slag bag in the second step is subjected to a slow cooling process, ventilated and cooled, and then sprayed to cool down; S4, broken magnetic separation: the The slag ladle after slow cooling in S3 is poured, and the slag is crushed and processed by magnetic separation. The invention can process the slag, increase the iron content in the slag, improve the grade of iron metal, and improve the recovery efficiency.

Description

A process for improving the grade of iron in slag magnetic separation and its material adding equipment

technical field

The invention relates to the technical field of slag processing, in particular to a process for improving the grade of iron in slag magnetic separation and material adding equipment thereof.

Background technique

The side-blown furnace slag undergoes slow cooling and beneficiation process to obtain copper concentrate and copper tailings, and the copper tailings are subjected to magnetic separation to obtain iron concentrate and magnetic tailings. Low, the grade of iron ore concentrate obtained by magnetism is low; in a domestic company, the copper slag processing capacity of the slag concentrator in 2021 is about 620,000 tons/year, and the copper slag is comprehensively processed by flotation copper-magnetic separation iron separation process Recycling, in the case of low iron-silicon ratio production, the slag concentrator can maintain a production rate of about 25%, and produce iron concentrate with a grade of 48%-50%. The market for iron concentrate with an iron grade of <50% is limited and has been piled up at present About 70,000 tons have seriously affected the production and economic benefits of enterprises.

At present, for the recovery of iron in side-blowing furnace slag, the commonly used method is grinding-magnetic separation. The main iron-containing phases in side-blowing furnace slag are fayalite and magnetite; both fayalite and magnetite are spinel minerals, but their magnetic properties are significantly different, so fayalite and magnetite can be realized through weak magnetism. Effective separation of magnetite, but the premise is to maximize the dissociation of magnetite as a monomer; in actual production, in view of the poor effect of ferromagnetic separation in side-blowing furnace slag, most enterprises adopt the optimization of existing magnetic separation process Solve the problem with parameters and increase the grinding-magnetic separation process, which essentially includes two aspects: first, reduce the particle size and increase the degree of monomer dissociation of magnetic iron oxide, so as to achieve better separation in the magnetic separation process Effect; second, optimize the magnetic separation process parameters and process, adjust from the magnetic separation itself, reduce the loss of target minerals into the magnetic separation tailings, and improve the magnetic separation effect.

This method has achieved certain results in most domestic enterprises, but there are also some disadvantages, such as the low recovery rate of concentrate after re-election by grinding-magnetic separation, and some target minerals enter the tailings of magnetic separation, resulting in economic losses; In addition, ore grinding itself is a high-energy-consuming processing unit. Increasing the grinding operation will lead to a substantial increase in production costs. From the perspective of economic benefits, this processing method is not preferred; in addition to the above methods, some studies use roasting or high temperature The reduction method recovers the iron in the side-blowing furnace slag, which mainly enriches the iron in the copper slag into Fe ₃ O ₄ through oxidation roasting or reduction roasting enrichment into metallic iron, and then combines magnetic separation or melting to recover; Roasting method or high temperature reduction method combined with magnetic separation can obtain high-grade magnetite or metallic iron, but there are disadvantages such as high energy consumption, secondary waste residue and flue gas generation, which do not meet the development requirements of clean production and green energy conservation advocated by China , this method has not yet achieved large-scale industrial application; therefore, how to improve the grade of magnetically separated iron in the slag and improve the effect of magnetic separation is a problem that needs to be solved.

Contents of the invention

In view of the above problems, the present invention provides a process for improving the grade of magnetically separated iron in slag and its material adding equipment. The invention can process the slag, increase the content of magnetically separated iron in the slag, improve the grade of iron metal, and improve the recovery efficiency.

In order to solve the above problems, the technical solution adopted in the present invention is:

A process for improving the grade of iron in slag magnetic separation, S1, material processing: crushing and drying the gypsum, controlling the water content of the gypsum to be less than 1%, and controlling the particle size of the gypsum: 1cm-2cm;

S2. Material addition: add the gypsum processed in S1 and molten slag into the slag bag for mixed reaction, and control the mixing ratio of gypsum and slag to 1:20-35;

S3. Slow cooling of the slag bag: After the S2 material is added, the slag bag in the second step is subjected to a slow cooling process, ventilated and cooled, and then sprayed with water to cool down, and the slow cooling time is controlled to be 48h-72h;

S4. Crushing and magnetic separation: the slag bag that has been cooled slowly in S3 is reversed, and the slag is crushed and processed by magnetic separation. The crushing particle size is controlled: 10cm-15cm. The jaw crusher can effectively save electricity in this crushing range , reduce crushing time and improve work efficiency.

Preferably, the negative pressure equipment is started in S2, and the directional flow of the slag flue gas is controlled to mix with the gypsum to achieve the adsorption of the flue gas.

A material adding device, comprising an installation main body for conveying gypsum, a feeding device is provided at the first end of the installation main body, a discharge device is provided at the second end of the installation main body, and an installation and The inner wall of the main body rotates relative to the screening body. The screening body is hollow and cylindrical. The surface of the screening body is provided with a screening area. Corresponding to the location of the area, the inside of the material conveying box is provided with a screw conveying blade, and the outside of the installation body is provided with a driving device for driving the screw conveying blade and the synchronous rotation of the screening body. The internal crushing device, the inner wall of the screening main body is fixedly connected with a copying assembly for lifting gypsum.

Preferably, the crushing device includes two crushing installation shafts arranged in parallel. Several crushing bodies arranged in parallel are installed on the surface of the crushing installation shafts. There is a crushing gap between the two crushing bodies corresponding to the paralleling. According to the gradual reduction of the moving direction of the material, the outer wall of the installation main body is provided with a first electric control device to control the synchronous rotation of the two crushing installation shafts.

Preferably, the drive device includes a first drive shaft located inside the installation body, a second drive shaft is rotatably connected to the outer wall of the material delivery box, and a second electric drive for controlling the rotation of the second drive shaft is installed on the outer wall of the material delivery box. The transmission between the second drive shaft and the first drive shaft is through a first-stage reduction device, and the transmission between the first drive shaft and the screening main body is through a second-stage reduction device.

Preferably, the upper end of the material delivery box communicates with the outer wall of the installation body through a material temporary storage bucket, and an inclined temporary storage baffle is fixedly connected to the inner wall of the material temporary storage bucket.

Preferably, the feeding device includes a feeding body, the upper end of the feeding body is fixedly connected with a control box, the upper end of the control box is fixedly connected with a feeding hopper, and the side wall of the control box is connected with a negative pressure pipeline, so The inner wall of the control box is provided with a valve group to control the conduction state of the feed hopper.

Preferably, the copying assembly is arranged inclined toward the first direction, a storage area is formed between the copying assembly and the screening body, and there are multiple copying assemblies distributed along the inner wall of the screening body.

Preferably, the copying assembly includes a first copying board and a second copying board, a torsional elastic member is connected between the first copying board and the second copying board, and the two parts of the first copying board The edge part of the end is fixedly connected with the limit sleeve, the edge part of the second copying plate is fixedly connected with the limit rod, the two ends of the limit rod pass through the limit sleeve, and the surface of the limit rod is provided with a control protrusion, The inner wall of the limiting sleeve is provided with a curved control groove, and the inner wall of the installation body is provided with a control component for controlling the movement of the limiting rod.

Preferably, the control component includes a first magnet and a second magnet, the first magnet is fixedly connected to the end of the limit rod, and the second magnet is fixedly connected to the inner wall of the installation body through a connecting workpiece.

The beneficial effects of the present invention are:

1. The present invention uses gypsum to decompose the target product, which can partially oxidize the ferrous iron in the slag to magnetic iron, increase the content of magnetic iron, CaO in the gypsum decomposition product reacts in the slag bag, and changes the pH of the smelting slag , has certain benefits to the flotation slag containing copper, which improves the comprehensive recycling benefits; and can realize the comprehensive utilization of self-produced waste acid gypsum; has the advantages of simple process flow, low investment and production costs, and high iron recovery rate; after treatment The grade of iron concentrate increases by 3%-5%, which has important environmental and economic benefits for copper smelting enterprises to realize the resource utilization of side-blown furnace slag and waste acid gypsum, and provides a new method for similar slag types in the same industry to improve magnetic iron.

2. By setting the screening body, crushing device and other components, the waste acid gypsum can be processed in an integrated manner, and the damage and screening of the gypsum can be realized. Finally, the crushed gypsum can be quantitatively transported through the spiral conveying blades to meet the gypsum Added quality and quantity requirements; setting the driving device can control the synchronous rotation of the screening main body and the screw conveying blade, and adjust according to the state of gypsum addition. The two are synchronously strengthened or weakened, which simplifies the control process and meets the needs of production and processing; The gypsum with a large size can be lifted and transported by setting the copying component, and the gypsum can automatically fall into the crushing device to complete the crushing. The crushing process and the screening process are all carried out in the screening main body, which improves the processing efficiency and meets the requirements processing needs.

3. The crushing gap gradually decreases along the moving direction of the gypsum, which can crush the gypsum in stages, improve the crushing efficiency while reducing the impact on the equipment, and prolong the service life of the equipment; by setting the control box, valve group, negative pressure pipeline, etc. Components, by closing the valve group in the control box, the interior of the installation body is relatively closed, and a negative pressure cycle is formed through the negative pressure pipe, which can allow the flue gas around the discharge pipe to flow directionally through the material conveying box, the screw conveying blade and the installation body to form smoke. The gas circulation channel realizes the circulation and absorption of flue gas, which can recover part of the iron oxide dust and reduce the impact on the working environment; the flue gas circulation channel is U-shaped, which prolongs the absorption distance and enhances the absorption of flue gas Effect: the crushed gypsum is conveyed by the spiral conveying blade, and the crushed gypsum forms a sponge-like adsorption filter element inside, which further enhances the effect of absorbing the flue gas, and the flue gas with a certain temperature can dry the gypsum and Preheating reduces the water content in the gypsum and at the same time reduces energy loss, which is beneficial to the recycling of iron, copper and other metals.

Description of drawings

Fig. 1 is the three-dimensional structure schematic diagram of the present invention;

Fig. 2 is the front view structure schematic diagram of the present invention;

Fig. 3 is the side view structural representation of the present invention;

Fig. 4 is the A-A line sectional structure schematic diagram of the present invention;

Fig. 5 is a schematic diagram of the three-dimensional structure of the screening main body of the present invention;

Fig. 6 is a side view structural schematic diagram of Fig. 5 of the present invention;

Fig. 7 is a schematic diagram of the chemical reaction of the present invention.

In the figure: 1, installation main body; 2, feeding device; 201, feeding hopper; 202, negative pressure pipeline; 203, control box; 2031, valve group; 204, feeding main body; 3, discharging device; 301, Material temporary storage bucket; 3011, temporary storage baffle; 302, material conveying box; 3021, discharge pipe; 303, screw conveying blade; 4, driving device; 401, two-stage reduction device; 4011, external gear ring; 4012, Reduction gear; 402, primary reduction device; 4021, pulley one; 4022, pulley two; 403, second drive shaft; 404, second electric control device; 5, crushing device; 501, crushing main body; 502, crushing installation shaft ; 503, the first electric control device; 6, the screening main body; 601, the screening area; 602, the annular baffle; 6021, through the opening; Sleeve; 703, limit rod; 704, second copying plate; 801, first magnet; 802, second magnet.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

A process for improving the grade of iron in slag magnetic separation, S1, material processing: crushing and drying the gypsum, controlling the moisture content of the gypsum to be less than 1%, and controlling the particle size of the gypsum: 1cm-2cm.

S2. Material addition: add the gypsum processed in S1 and molten slag into the slag bag for mixed reaction, and control the mixing ratio of gypsum and slag to 1:20-35; through the reaction of gypsum and molten slag, the slag can be The divalent iron in the bag is oxidized to magnetic iron, which improves the grade of slag iron and improves the effect of subsequent magnetic separation.

S3. Slow cooling of the slag bag: After the S2 material is added, the slag bag in the second step is subjected to a slow cooling process, ventilated and cooled, and then sprayed with water to cool down, and the slow cooling time is controlled to be 48h-72h;

S4. Crushing and magnetic separation: the slag bag that has been slowly cooled in S3 is turned over, and the slag is crushed and subjected to magnetic separation processing, wherein the crushing particle size is controlled: 10cm-15cm.

Start the negative pressure equipment in S2, control the directional flow of slag flue gas to mix with gypsum to realize the adsorption of flue gas, by controlling the mixing of flue gas and gypsum, on the one hand, part of the oxygen and iron in the flue gas can be captured by gypsum to reduce the loss of iron ; On the other hand, it can directional absorb the flue gas and improve the working environment.

Gypsum reaction principle:

Gypsum (CaS0 ₄ 2H ₂ 0) is a calcium sulfate crystal with two crystal waters. During heat treatment under different conditions, its crystal water is easy to come out. At 800°C, gypsum begins to decompose into CaO and SO ₂ plus O ₂ etc.; when adding gypsum to the high-temperature smelting slag melt of the side-blowing furnace, the gypsum decomposes, and the generated CaO takes away the silicon dioxide in fayalite, and _O2 can oxidize the ferrous iron in fayalite to Magnetic iron:

3(2FeO·SiO ₂ )+3CaO+O ₂ →3CaSiO ₃ +2Fe ₃ O ₄

Referring to Fig. 1-Fig. 6, a material adding equipment includes an installation main body 1 for conveying gypsum, a feeding device 2 is provided at the first end of the installation main body 1, and a discharge device 3 is provided at the second end of the installation main body 1, and the gypsum Raw materials are added from the feeding device 2 to the installation main body 1 to complete crushing and screening, and the gypsum that meets the size requirements is discharged from the discharge device 3 to realize the addition of gypsum; Rotating screening main body 6, the screening main body 6 is hollow cylindrical, the surface of the screening main body 6 is provided with a screening area 601, and the screening process of the material is realized through the screening main body 6, wherein the screening main body is selected as a plurality of circles Distributed screening rods, with a predetermined gap between two adjacent screening rods, can allow gypsum particles with a size less than 2cm to be discharged from there, and enter the discharge device 3 to realize the discharge process.

Wherein the discharge device 3 comprises a material delivery box 302, the position of the material delivery box 302 corresponds to the position of the screening area 601, the inside of the material delivery box 302 is provided with a spiral delivery blade 303, and the end of the material delivery box 302 is fixedly provided with a discharge pipeline 3021, the crushed gypsum particles can be transported by controlling the rotation of the screw conveying blade 303, and finally discharged from the discharge pipe 3021 to realize the quantitative addition of gypsum; the outside of the installation main body 1 is provided with a driving screw conveying blade 303 and a screening main body 6 Synchronously rotating driving device 4, through which the driving device 4 controls the synchronous rotation of the screw conveying blade 303 and the screening main body 6, which can synchronously improve the efficiency of screening according to the efficiency of material transportation, ensure the synchronization of the two, and simplify the control process , improving the processing efficiency; and the crushing device 5 positioned at the inside of the screening body 6 is installed on the inner wall of the installation body 1, and the inner wall of the screening main body 6 is fixedly connected with a copying assembly 7 for lifting gypsum, and the screening assembly 7 can be used for screening The larger-sized gypsum in the main body 6 is transported, and it is lifted to the top to realize the crushing and adding process of gypsum, and the material can fall into the crushing device 5 to realize the crushing process.

Referring to accompanying drawing 4; wherein crushing device 5 comprises two crushing installation shafts 502 arranged side by side, and several crushing main bodies 501 arranged side by side are installed on the surface of the crushing installation shaft 502, and there is a crushing gap between the two crushing main bodies 501 corresponding in parallel, The multiple crushing gaps gradually decrease according to the moving direction of the material. The outer wall of the installation body 1 is provided with a first electric control device 503 to control the synchronous rotation of the two crushing installation shafts 502. The two crushing installation shafts 502 are controlled by the first electric control device 503 Rotating towards the inside, the gypsum falling onto the surface of the crushing main body 501 can be crushed under the action of extrusion; referring to accompanying drawing 4, wherein the gypsum conveying direction of the material in the screening main body 6 is conveyed from left to right, The crushing gap between the crushing bodies 501 on the left side is larger than the crushing gap between the crushing bodies 501 on the right side. Gradient crushing of materials can be achieved by setting the crushing gap to gradually increase, gradually reducing the strength of gypsum, reducing the difficulty of crushing and Reduce the loss of parts; on the surface of the crushing main body 501, raised crushing teeth can be fixed to enhance the crushing effect on gypsum.

With reference to accompanying drawing 4; Wherein driving device 4 comprises the first drive rotating shaft that is positioned at installation main body 1 inside, and material delivery case 302 outer walls are rotatably connected with second drive rotating shaft 403, and material delivery case 302 outer walls are installed and used to control second drive rotating shaft 403 to rotate The second electronic control device 404, the transmission between the second drive shaft 403 and the first drive shaft through a first-stage reduction device 402, the transmission between the first drive shaft and the screening main body 6 through a two-stage reduction device 401, and the first-stage reduction device 401 is used for transmission. The deceleration device 402 and the secondary deceleration device 401 can adjust the transmission efficiency of the second drive shaft 403 to realize the proportional transmission of the screening main body 6 and the screw conveying blade 303, wherein the screening main body 6 has a larger volume and a lower rotation rate than the screw conveyor. The rotation speed of the conveying blade 303; when the required material increases, the rotation speed of the control screw conveying blade 303 is increased. At this time, the discharge rate of the gypsum is increased, and the screening rate of the screening main body 6 is increased synchronously. The two coordinate and cooperate , to meet the demand for gypsum addition.

Among them, the first-stage reduction device 402 can be selected as a combination of pulley one 4021 and pulley two 4022, and the cooperation of the two can realize a first-stage reduction. Among them, the second-stage reduction device 401 can be selected as a combination of an external gear ring 4011 and a reduction gear 4012. The external gear The ring 4011 is fixed on the outer wall of the screening main body 6, and the two cooperate to realize the two-stage deceleration; what needs to be explained here is that the first drive shaft runs through the installation main body 1 and partially extends to the outside, and the first-stage deceleration device 402 is located inside the installation main body 1 To realize power transmission, the secondary reduction device 401 is located on the outside of the installation body 1 to realize power transmission. The power transmission between the secondary reduction device 401 and the primary reduction device 402 is realized through the first drive shaft. The first drive shaft and the installation body 1 There is a rotating connection between them, and a sealing sleeve is provided at the position of the rotating connection, which can ensure a relative sealing effect.

Between the upper end of the material delivery box 302 and the outer wall of the installation main body 1, the material temporary storage bucket 301 is connected, and the inner wall of the material temporary storage bucket 301 is fixedly connected with an inclined temporary storage baffle 3011. Referring to accompanying drawing 4, the inclined temporary storage baffle 3011 Extending from the upper left to the lower right, and there is a gap at the edge of the lower right for material discharge; the temporary storage baffle 3011 and the inner wall of the material temporary storage bucket 301 form a temporary storage chamber that can store materials, and can be screened according to the screening rate And the difference in the output rate is adjusted to ensure the quantity of output and meet the demand.

The feeding device 2 includes a feeding body 204, the upper end of the feeding body 204 is fixedly connected with a control box 203, the upper end of the control box 203 is fixedly connected with a feed hopper 201, the side wall of the control box 203 is connected with a negative pressure pipeline 202, and the control box 203 The inner wall is provided with a valve group 2031 to control the conduction state of the feed hopper 201, wherein the negative pressure pipeline 202 is externally connected with negative pressure equipment, after closing the valve group 2031, the negative pressure can be generated through the negative pressure pipeline 202 to drive the gas orientation in the installation body 1 Specifically, the flue gas around the discharge pipe 3021 is inhaled from there, passes through the material conveying box 302 and the material temporary storage bucket 301 in turn, enters the screening body 6, and finally flows to the negative pressure pipe 202 to realize the flue gas circulation channel; during the process of flue gas circulation in the flue gas circulation channel, most of the flue gas can be mixed and absorbed by the crushed gypsum, and part of the iron oxide dust in the flue gas can be absorbed and finally discharged into the slag bag, reducing the The loss of iron; and after the flue gas is absorbed, it can reduce the impact of the flue gas on the surrounding environment and improve the working environment; according to the actual processing environment, an adjustable corrugated pipe can be installed at the end of the discharge pipe 3021 to shorten the distance and ensure the delivery of gypsum Accurate and stable; an inverted funnel is installed at the end of the corrugated pipe, which can increase the adsorption area at the end and enhance the adsorption effect on smoke.

What needs to be explained here is that the flue gas channel is bent U-shaped to form a U-shaped flue gas circulation channel. The U-shaped flue gas channel can prolong the contact time between the flue gas and the gypsum, increase the contact area, and improve the absorption. As a result, the crushed gypsum particles can also act as an adsorbent to reduce the loss of iron oxide fumes; In a relatively full state, the gypsum in the screw conveying blade 303 has a good filling effect and a high density during the conveying process, which further improves the smoke absorption effect.

Specifically refer to accompanying drawing 6; Wherein copying material component 7 is inclined toward the first direction and is arranged, forms storage area between copying material component 7 and screening main body 6, and copying material component 7 is a plurality of and along the inner wall circumference of screening main body 6 distribution, the screening main body 6 in Figure 6 rotates clockwise, and the inclination direction of the material copying component 7 forms an acute angle area with the inner wall of the screening main body 6 to realize the storage of materials. During the rotation process of the screening main body 6, large-sized gypsum particles It can be temporarily stored in the formed storage area, and can realize the lifting and conveying of the gypsum. When the copying component 7 moves to the predetermined angle position, the gypsum can freely fall between the crushing devices 5 under the action of gravity to realize crushing feeding processing.

Wherein the copying assembly 7 comprises a first copying board 701 and a second copying board 704, and a torsion elastic part is connected between the first copying board 701 and the second copying board 704, which can be selected as a torsion spring, at the first The edges of both ends of the copying board 701 are fixedly connected to the limiting sleeve 702, and the edge part of the second copying board 704 is fixedly connected to the limiting rod 703, and the two ends of the limiting rod 703 pass through the limiting sleeve 702. There is a gap between 704 and the first copying plate 701, wherein the second copying plate 704 can not only rotate around the end of the first copying plate 701, but also move linearly along the axis of the screening main body 6; There is a control bump on the surface of 703, and a curved control groove is opened on the inner wall of the limit sleeve 702, and the control protrusion can slide in the curved control groove, wherein the second copying plate 704 is along the axis direction of the screening main body 6 In the process of linear movement, it can rotate synchronously under the cooperation of the control protrusion and the control groove, and realize the rapid unloading of gypsum by controlling its rotation; the inner wall of the installation body 1 is provided with a control for controlling the movement of the limit rod 703 Parts, through the control part to control the stop bar 703 to move at a predetermined position; before the stop bar 703 moves, the second copying plate 704 is in the state shown in Figure 6, which can accommodate the gypsum and allow it to be lifted to a predetermined height; after the limit bar 703 moves, it can overcome the force of the torsion elastic member, so that the second copying plate 704 is rotated in the second direction, and the restriction on the gypsum disappears, and the gypsum slides into the crushing device 5 to complete crushing processing.

As a preferred control method; wherein the control component includes a first magnet 801 and a second magnet 802, and the state of the first magnet 801 and the second magnet 802 is determined to be in an attracting or repelling state according to the state of the control protrusion and the control groove; wherein the first The magnet 801 is fixedly connected to the end of the limit rod 703, the second magnet 802 is fixedly connected to the inner wall of the installation body 1 by connecting the workpiece, and the state of the first magnet 801 is controlled by the second magnet 802 to control the linear movement of the limit rod 703 to realize the control process ; The same above-mentioned control method can choose mechanical methods such as wedge blocks to realize the control process.

Finally, it should be noted that the screening body 6 is divided into a first end and a second end according to the feeding direction, the first end is the end close to the feeding device 2, and the inner wall of the installation body 1 has a storage chamber for accommodating the screening The first end of the main body 6 forms a descending step to ensure the transportation of materials; the second end of the screening main body 6 is fixed with an inclined annular baffle 602, and the middle position of the annular baffle 602 forms an opening 6021 for the crushing device. 5. By setting the annular baffle 602, the gypsum at the second end can be blocked, and its movement can be restricted to realize circular crushing, and the two will not interfere; The position is relatively high, so as to realize the directional conveying of materials in the process of rotating and screening, and improve the efficiency of screening and conveying.

Working principle: Add gypsum to the screening main body 6 through the feeding device 2, and the screening main body 6 can screen the gypsum during the rotation process, and the gypsum that meets the size requirements falls into the discharging device 3, and finally from the The discharge pipe 3021 is discharged; the gypsum whose size does not meet the requirements can be lifted to a high position under the action of the copying assembly 7, and falls into the crushing device 5 during the rotation process, and the crushing of large-sized gypsum is completed by the crushing device 5. crushing processing.

After the gypsum is added for the first time, the valve group 2031 in the adjustment control box 203 is closed. At this time, the negative pressure can be generated through the negative pressure pipeline 202 to drive the directional flow of the gas, and the flue gas around the opening of the discharge pipeline 3021 can be combined with the flow of the material. Flow in the opposite direction, so that the flue gas can be mixed with the internal gypsum, and the flue gas is absorbed by the gypsum, reducing the loss of iron in the slag ladle and reducing the impact on the surrounding environment.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of the present invention. within the scope of protection.

Claims (10)

1. a technique for improving slag magnetic separation iron grade is characterized in that, comprises the steps: S1. Material processing: crush and dry the gypsum, control the moisture content of the gypsum to be less than 1%, and control the particle size of the gypsum: 1cm-2cm; S2. Material addition: add the gypsum processed in S1 and molten slag into the slag bag for mixed reaction, and control the mixing ratio of gypsum and slag to 1:20-35; S3. Slow cooling of the slag bag: After the S2 material is added, the slag bag in the second step is subjected to a slow cooling process, ventilated and cooled, and then sprayed with water to cool down, and the slow cooling time is controlled to be 48h-72h; S4. Crushing and magnetic separation: the slag bag that has been slowly cooled in S3 is turned over, and the slag is crushed and subjected to magnetic separation processing, wherein the crushing particle size is controlled: 10cm-15cm. 2. A process for improving the grade of slag magnetic iron separation according to claim 1, characterized in that, in S2, the negative pressure equipment is started to control the directional flow of slag flue gas to mix with gypsum to achieve the adsorption of flue gas. 3. A material adding device, comprising an installation main body (1) for conveying gypsum, the first end of the installation main body (1) is provided with a feeding device (2), and the second end of the installation main body (1) is provided with There is a discharge device (3), which is characterized in that: the inside of the installation body (1) is provided with a screening body (6) that rotates relative to the inner wall of the installation body (1), and the screening body (6) is a hollow cylinder shape, the surface of the screening main body (6) is provided with a screening area (601), the discharge device (3) includes a material delivery box (302), and the position of the material delivery box (302) is in the same position as the screening area ( 601) corresponds to the position, the material conveying box (302) is provided with a screw conveying blade (303) inside, and the outside of the installation main body (1) is provided with a device for driving the screw conveying blade (303) and the screening main body (6) synchronously Rotating driving device (4), the inner wall of the installation main body (1) is equipped with a crushing device (5) inside the screening main body (6), and the inner wall of the screening main body (6) is fixedly connected with a lifter for lifting gypsum. material assembly (7). 4. A kind of material adding equipment according to claim 1, characterized in that, the crushing device (5) comprises two crushing installation shafts (502) arranged side by side, and the surface of the crushing installation shafts (502) is installed with Several crushing bodies (501) arranged side by side have crushing gaps between the corresponding two crushing bodies (501), and the multiple crushing gaps gradually decrease according to the direction of material movement. The outer wall of the installation body (1) is provided with a second An electric control device (503) is used to control the synchronous rotation of the two crushing installation shafts (502). 5. The material adding equipment according to claim 1, characterized in that, the driving device (4) includes a first driving shaft located inside the installation body (1), and the outer wall of the material delivery box (302) rotates A second drive shaft (403) is connected, and a second electric control device (404) for controlling the rotation of the second drive shaft (403) is installed on the outer wall of the material delivery box (302). The second drive shaft (403) is connected to the The transmission between the first driving shafts is through a first-stage reduction device (402), and the transmission between the first driving shaft and the screening main body (6) is through a second-stage reduction device (401). 6. A material adding device according to claim 1, characterized in that, the upper end of the material delivery box (302) communicates with the outer wall of the installation body (1) through a material temporary storage bucket (301), and the material An inclined temporary storage baffle (3011) is fixedly connected to the inner wall of the temporary storage bucket (301). 7. A material adding device according to claim 1, characterized in that, the feeding device (2) comprises a feeding body (204), and the upper end of the feeding body (204) is fixedly connected with a control box ( 203), the upper end of the control box (203) is fixedly connected with a feed hopper (201), the side wall of the control box (203) is connected with a negative pressure pipeline (202), and the inner wall of the control box (203) is provided with a valve The group (2031) is used to control the conduction state of the feed hopper (201). 8. A material adding device according to claim 1, characterized in that, the copying component (7) is inclined towards the first direction, and the copying component (7) and the screening body (6) A storage area is formed between them, and there are multiple copying components (7) distributed along the circumference of the inner wall of the screening body (6). 9. A material adding device according to claim 1, characterized in that, the copying assembly (7) comprises a first copying board (701) and a second copying board (704), and the first copying board (704) A torsion elastic component is connected between the copying board (701) and the second copying board (704). The edge part of the second copying plate (704) is fixedly connected with the limit rod (703), and the two ends of the limit rod (703) pass through the limit sleeve (702), and the surface of the limit rod (703) has a control protrusion. The inner wall of the limit sleeve (702) is provided with a curved control groove, and the inner wall of the installation body (1) is provided with a control component for controlling the movement of the limit rod (703). 10. A material adding device according to claim 9, characterized in that, the control component comprises a first magnet (801) and a second magnet (802), and the first magnet (801) and a limit rod (703) The end is fixedly connected, and the second magnet (802) is fixedly connected to the inner wall of the installation main body (1) through a connecting workpiece.

Images