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

Abstract

The present invention provides a process for improving the iron grade of slag magnetic separation and its material adding equipment, S1, material processing: crushing and drying gypsum; S2, material adding: adding the gypsum processed by S1 and the molten slag into the slag bag for mixed reaction; S3, slow cooling of the slag bag: after the addition of S2 materials is completed, the slag bag in the second step is subjected to a slow cooling process, ventilation cooling, and then water spray cooling; S4, crushing magnetic separation: the slag bag after the slow cooling in S3 is inverted, the slag is crushed and subjected to magnetic separation processing. The invention can process the slag, increase the content of selected iron in the slag, improve the grade of iron metal, and improve the recovery efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of slag processing, and in particular to a process for improving the iron grade of slag magnetic separation and material adding equipment thereof. Background Art

[0002] The side-blown furnace slag is subjected to slag slow cooling and mineral processing technology to obtain copper concentrate and copper tailings. The copper tailings are magnetically separated to obtain iron concentrate and magnetic tailings. Since the proportion of magnetic iron in the side-blown furnace slag is low, the grade of the iron concentrate obtained by magnetism is low. In 2021, the copper slag processing capacity of the slag concentrator of a certain domestic enterprise was about 620,000 tons / year. The flotation copper selection-magnetic iron selection process was used to comprehensively recycle the copper slag. Under the production conditions of low iron-silicon ratio, the slag concentrator can maintain a yield 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 about 70,000 tons have been accumulated so far, seriously affecting the production and economic benefits of the enterprise.

[0003] At present, the commonly used method for recovering iron from side-blown furnace slag is grinding-magnetic separation. The main iron-containing phases in side-blown furnace slag are fayalite and magnetite; both fayalite and magnetite are spinel minerals, but their magnetic properties are significantly different. Therefore, fayalite and magnetite can be effectively separated through weak magnetism, but the premise is to maximize the monomer dissociation of magnetite minerals; in actual production, in order to solve the problem of poor magnetic separation effect of iron in side-blown furnace slag, most companies adopt the optimization of existing magnetic separation processes and parameters and increase the grinding-magnetic separation process to solve it. Its essence includes two aspects: first, reduce the particle size and increase the monomer dissociation degree of magnetic iron oxide, so as to achieve better separation effect in the magnetic separation process; second, optimize the magnetic separation process parameters and processes, adjust from the magnetic separation itself, reduce the loss of target minerals into the magnetic separation tailings, and improve the magnetic separation effect.

[0004] This method has achieved certain results in most domestic enterprises, but it also has some disadvantages, such as the low concentrate recovery rate after grinding-magnetic separation, and some target minerals enter the magnetic separation tailings, causing economic losses; in addition, grinding itself is a high-energy processing unit. The increase in grinding operations will lead to a significant increase in production costs. From the perspective of economic benefits, this treatment method does not have preferential selectivity; in addition to the above methods, some studies have used roasting or high-temperature reduction to recover iron from side-blown furnace slag, mainly by oxidative roasting to enrich the iron in copper slag into Fe3O4 or reduction roasting to enrich it into metallic iron, and then combined with magnetic separation or smelting processes for recovery; roasting or high-temperature reduction combined with magnetic separation can obtain high-grade magnetite or metallic iron, but there are disadvantages such as high energy consumption, generation of secondary waste slag and flue gas, which does not meet the development requirements of clean production and green energy conservation advocated by my country. This method has not yet been applied on a large scale in industry; therefore, how to improve the grade of magnetically separated iron in slag and enhance the magnetic separation effect is a problem that needs to be solved. Summary of the invention

[0005] In view of the above problems, the present invention provides a process for improving the grade of magnetically separated iron in slag and material adding equipment thereof. The invention can process slag, increase the content of magnetically separated iron in the slag, improve the grade of iron metal, and improve the recovery efficiency.

[0006] To solve the above problems, the technical solution adopted by the present invention is:

[0007] A process for improving the iron grade of 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 to be 1cm-2cm;

[0008] S2, material addition: adding the gypsum processed in S1 and the molten slag into the slag bag for mixing reaction, and controlling the mixing ratio of gypsum to slag to be 1:20-35;

[0009] S3, slag bag slow cooling: after the S2 material is added, the slag bag in the second step is subjected to a slow cooling process, ventilation cooling, and then water spray cooling, and the slow cooling time is controlled to be 48h-72h;

[0010] S4, crushing and magnetic separation: the slag bag after slow cooling in S3 is turned over, the slag is crushed and magnetically separated, and the crushing particle size is controlled at 10cm-15cm. The jaw crusher can effectively save electricity, reduce crushing time and improve work efficiency in this crushing range.

[0011] Preferably, the negative pressure equipment is started in S2 to control the directional flow of the slag flue gas and mix it with the gypsum to achieve adsorption of the flue gas.

[0012] A material adding device comprises an installation body for conveying gypsum, a feeding device is arranged at the first end of the installation body, a discharging device is arranged at the second end of the installation body, a screening body which rotates relative to the inner wall of the installation body is arranged inside the installation body, the screening body is hollow cylindrical, a screening area is arranged on the surface of the screening body, the discharging device comprises a material conveying box, the position of the material conveying box corresponds to the position of the screening area, a spiral conveying blade is arranged inside the material conveying box, a driving device for driving the spiral conveying blade and the screening body to rotate synchronously is arranged on the outer side of the installation body, a crushing device located inside the screening body is installed on the inner wall of the installation body, and a material shoveling component for lifting gypsum is fixedly connected to the inner wall of the screening body.

[0013] Preferably, the crushing device comprises two crushing mounting shafts arranged in parallel, a plurality of crushing bodies arranged in parallel are installed on the surface of the crushing mounting shaft, a crushing gap is provided between the two corresponding crushing bodies in parallel, and the plurality of crushing gaps gradually decrease along the direction of material movement, and a first electric control device is provided on the outer wall of the mounting body for controlling the synchronous rotation of the two crushing mounting shafts.

[0014] Preferably, the driving device includes a first driving shaft located inside the installation body, the outer wall of the material conveying box is rotatably connected to the second driving shaft, the outer wall of the material conveying box is installed with a second electronic control device for controlling the rotation of the second driving shaft, the second driving shaft and the first driving shaft are transmitted through a primary reduction device, and the first driving shaft and the screening body are transmitted through a secondary reduction device.

[0015] Preferably, the upper end of the material conveying box is connected to 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.

[0016] Preferably, the feeding device includes a feeding body, a control box is fixedly connected to the upper end of the feeding body, a feeding hopper is fixedly connected to the upper end of the control box, a negative pressure pipe is connected to the side wall of the control box, and a valve group is arranged on the inner wall of the control box to control the conduction state of the feeding hopper.

[0017] Preferably, the material shoveling assembly is arranged to be inclined toward the first direction, a storage area is formed between the material shoveling assembly and the screening body, and there are multiple material shoveling assemblies distributed along the circumference of the inner wall of the screening body.

[0018] Preferably, the material copying assembly comprises a first material copying plate and a second material copying plate, a torsion elastic component is connected between the first material copying plate and the second material copying plate, the edge portions at both ends of the first material copying plate are fixedly connected to a limiting sleeve, the edge portions of the second material copying plate are fixedly connected to a limiting rod, both ends of the limiting rod pass through the limiting sleeve, a control protrusion is provided on the surface of the limiting rod, a curved control groove is provided on the inner wall of the limiting sleeve, and a control component for controlling the movement of the limiting rod is provided on the inner wall of the mounting body.

[0019] Preferably, the control component includes a first magnet and a second magnet, the first magnet is fixedly connected to the end of the limiting rod, and the second magnet is fixedly connected to the inner wall of the installation body through a connecting workpiece.

[0020] The beneficial effects of the present invention are:

[0021] 1. The present invention utilizes gypsum to decompose the target product, which can partially oxidize the divalent iron in the slag into magnetic iron, thereby increasing the content of magnetic iron. The CaO in the gypsum decomposition product reacts in the slag bag to change the pH value of the smelting slag, which has certain benefits for the copper content in the flotation slag and improves the comprehensive recovery and utilization efficiency; and can realize the comprehensive utilization of self-produced waste acid gypsum; it has the advantages of simple process flow, low investment and production cost, and high iron recovery rate; the grade of the iron ore concentrate after treatment increases by 3%-5%, which realizes the resource utilization of side-blown furnace slag and waste acid gypsum for copper smelting enterprises, has important environmental and economic benefits, and provides a new method for improving magnetic iron in similar slag types in the same industry.

[0022] 2. By setting up the screening body, crushing device and other components, the waste acid gypsum can be processed in an integrated manner to achieve the breakage and screening of the gypsum. Finally, the crushed gypsum can be quantitatively transported through the spiral conveying blades to meet the quality and quantity requirements of gypsum addition; by setting up the driving device, the screening body and the spiral conveying blades can be controlled to rotate synchronously, and the two can be adjusted according to the state of gypsum addition, and the two can be strengthened or weakened synchronously, which simplifies the control process and meets the needs of production and processing; by setting up the material-scraping component, the larger gypsum can be lifted and transported, and the gypsum can automatically fall into the crushing device to complete the crushing. The crushing process and the screening process are both carried out in the screening body, which improves the processing efficiency and meets the processing needs.

[0023] 3. The crushing gap gradually decreases along the moving direction of the gypsum, which can crush the gypsum in stages, improve the crushing efficiency, reduce the impact on the equipment, and extend the service life of the equipment; by setting up components such as a control box, a valve group, and a negative pressure pipe, the valve group in the control box is closed to make the interior of the installation body relatively closed, and a negative pressure cycle is formed through the negative pressure pipe, which can make the flue gas around the discharge pipe flow in a directional manner through the material conveying box, the spiral conveying blades, and the installation body to form a flue gas circulation channel to achieve circulating absorption of the flue gas, which can recycle part of the iron oxide dust while reducing the impact on the working environment; the flue gas circulation channel is U-shaped, which extends the absorption distance and enhances the effect of flue gas absorption; the crushed gypsum is transported by the spiral conveying blades, and the crushed gypsum forms a sponge-like adsorption filter element inside it, which further enhances the effect of flue gas absorption, and the flue gas with a certain temperature can dry and preheat the gypsum, which reduces the water content in the gypsum and reduces energy loss, which is conducive to the recycling of metals such as iron and copper. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0025] Figure 2 It is a schematic diagram of the main structure of the present invention;

[0026] Figure 3 It is a side view structural schematic diagram of the present invention;

[0027] Figure 4 This is a schematic diagram of the AA line cross-sectional structure of the present invention;

[0028] Figure 5 It is a schematic diagram of the three-dimensional structure of the screening body of the present invention;

[0029] Figure 6 For the present invention Figure 5 A side view structural schematic diagram of;

[0030] Figure 7 Schematic diagram of the chemical reaction of the present invention.

[0031] In the figure: 1. Installation body; 2. Feeding device; 201. Feeding hopper; 202. Negative pressure pipeline; 203. Control box; 2031. Valve group; 204. Feeding body; 3. Discharging device; 301. Material temporary storage hopper; 3011. Temporary storage baffle; 302. Material conveying box; 3021. Discharging pipeline; 303. Spiral conveying blade; 4. Driving device; 401. Secondary reduction device; 4011. External gear ring; 4012. Reduction gear; 402. Primary reduction device; 4021. Pulley 1; 4022, pulley 2; 403, second drive shaft; 404, second electric control device; 5, crushing device; 501, crushing body; 502, crushing installation shaft; 503, first electric control device; 6, screening body; 601, screening area; 602, annular baffle; 6021, through opening; 7, material copying assembly; 701, first material copying plate; 702, limiting sleeve; 703, limiting rod; 704, second material copying plate; 801, first magnet; 802, second magnet. DETAILED DESCRIPTION

[0032] The present invention is further described below in conjunction with the accompanying drawings and embodiments.

[0033] A process for improving the iron grade of 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 to be: 1cm-2cm.

[0034] S2. Material addition: add the gypsum processed by S1 and the molten slag into the slag bag for mixing reaction, and control the mixing ratio of gypsum to slag to be 1:20-35; through the reaction of gypsum and molten slag, the divalent iron in the slag bag can be oxidized into magnetic iron, thereby improving the iron grade of the slag and the subsequent magnetic separation effect.

[0035] S3, slag bag slow cooling: after the S2 material is added, the slag bag in the second step is subjected to a slow cooling process, ventilation cooling, and then water spray cooling, and the slow cooling time is controlled to be 48h-72h;

[0036] S4, crushing and magnetic separation: the slag bag after slow cooling in S3 is inverted, the slag is crushed and magnetically separated, and the crushing particle size is controlled to be 10cm-15cm.

[0037] In S2, negative pressure equipment is started to control the directional flow of slag flue gas and mix it with gypsum to achieve 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 iron loss; on the other hand, the flue gas can be absorbed in a direction to improve the working environment.

[0038] Gypsum reaction principle:

[0039] Gypsum (CaS04·2H20) is a calcium sulfate crystal with two crystal waters. During heating treatment under different conditions, its crystal water is easily released. At 800°C, gypsum begins to decompose into CaO, SO2 and O2. When gypsum is added to the high-temperature smelting slag melt in the side-blown furnace, the gypsum decomposes and the generated CaO takes away the silicon dioxide in the fayalite, while O2 can oxidize the divalent iron in the fayalite into magnetic iron:

[0040] 3(2FeO·SiO2)+3CaO+O2→3CaSiO3+2Fe3O4

[0041] Reference Figure 1 - Figure 6 A material adding device comprises an installation body 1 for conveying gypsum, a feeding device 2 is arranged at the first end of the installation body 1, and a discharging device 3 is arranged at the second end of the installation body 1. The gypsum raw material is added from the feeding device 2 to the installation body 1 to complete crushing and screening, and the gypsum that meets the size requirements is discharged from the discharging device 3 to realize the addition of gypsum; a screening body 6 is arranged inside the installation body 1 and rotates relative to the inner wall of the installation body 1. The screening body 6 is hollow cylindrical, and a screening area 601 is arranged on the surface of the screening body 6. The screening processing of the material is realized by the screening body 6, wherein the screening body is selected to be composed of a plurality of circumferentially distributed screening rods, and a predetermined gap is provided between two adjacent screening rods, so that gypsum particles with a size less than 2 cm can be discharged from there and enter the discharging device 3 to realize the discharging process.

[0042] The discharging device 3 includes a material conveying box 302, the position of the material conveying box 302 corresponds to the position of the screening area 601, a spiral conveying blade 303 is arranged inside the material conveying box 302, and a discharging pipe 3021 is fixedly arranged at the end of the material conveying box 302. By controlling the rotation of the spiral conveying blade 303, the crushed gypsum particles can be conveyed and finally discharged from the discharging pipe 3021, so as to realize the quantitative addition of gypsum; a driving device 4 for driving the spiral conveying blade 303 and the screening body 6 to rotate synchronously is arranged on the outside of the installation body 1, and the driving device 4 is used to drive the spiral conveying blade 303 and the screening body 6 to rotate synchronously. The spiral conveying blade 303 and the screening body 6 are controlled to rotate synchronously, and the screening efficiency can be improved synchronously according to the material conveying efficiency, so as to ensure the synchronization of the two, simplify the control process, and improve the processing efficiency; and a crushing device 5 located inside the screening body 6 is installed on the inner wall of the installation body 1, and a material scooping component 7 for lifting gypsum is fixedly connected to the inner wall of the screening body 6, and the scooping component 7 can be used to transport the larger gypsum in the screening body 6, and lift it to the upper side to realize the crushing and adding process of the gypsum, and the material can fall into the crushing device 5 to realize the crushing process.

[0043] Refer to the attached Figure 4 ; The crushing device 5 includes two crushing installation shafts 502 arranged in parallel, and a plurality of crushing bodies 501 arranged in parallel are installed on the surface of the crushing installation shafts 502. There is a crushing gap between the two corresponding crushing bodies 501 in parallel, and the plurality of 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 for controlling the two crushing installation shafts 502 to rotate synchronously. The two crushing installation shafts 502 are controlled to rotate inward by the first electric control device 503, and the gypsum falling onto the surface of the crushing body 501 can be crushed under the action of extrusion; refer to the attached Figure 4 , wherein the material is transported from the left side to the right side in the gypsum conveying direction in the screening body 6, 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, and by setting the crushing gap to gradually increase, the material can be gradually crushed, the strength of the gypsum is gradually reduced, the difficulty of crushing is reduced, and the loss of parts is reduced; raised crushing teeth can be fixed on the surface of the crushing body 501 to enhance the crushing effect of the gypsum.

[0044] Refer to the attached Figure 4The driving device 4 comprises a first driving shaft located inside the installation body 1, and a second driving shaft 403 is rotatably connected to the outer wall of the material conveying box 302. A second electric control device 404 for controlling the rotation of the second driving shaft 403 is installed on the outer wall of the material conveying box 302. The second driving shaft 403 and the first driving shaft are transmitted through a primary reduction device 402, and the first driving shaft and the screening body 6 are transmitted through a secondary reduction device 401. By setting the primary reduction device 402 and the secondary reduction device 401, the transmission efficiency of the second driving shaft 403 can be adjusted to realize proportional transmission of the screening body 6 and the spiral conveying blades 303, wherein the screening body 6 has a larger volume and a rotation rate lower than the rotation rate of the spiral conveying blades 303; when the required material increases, the rotation speed of the spiral conveying blades 303 is controlled to increase, at which time the discharge rate of gypsum increases, and the screening rate of the screening body 6 increases synchronously, and the two coordinate with each other to meet the gypsum addition demand.

[0045] The primary reduction gear 402 can be selected as a combination of pulley one 4021 and pulley two 4022, and the two can cooperate to achieve primary reduction. The secondary reduction gear 401 can be selected as a combination of an outer gear ring 4011 and a reduction gear 4012, and the outer gear ring 4011 is fixed to the outer wall of the screening body 6, and the two can cooperate to achieve secondary reduction. It should be noted that the first driving shaft penetrates the installation body 1 and partially extends to the outside, the primary reduction gear 402 is located on the inner side of the installation body 1 to realize power transmission, and the secondary reduction gear 401 is located on the outer side of the installation body 1 to realize power transmission. The power transmission is realized between the secondary reduction gear 401 and the primary reduction gear 402 through the first driving shaft. The first driving shaft is rotationally connected to the installation body 1, and a sealing sleeve is provided at the rotationally connected position to ensure a relative sealing effect.

[0046] The upper end of the material conveying box 302 is connected to the outer wall of the installation body 1 through the material temporary storage bucket 301, and the inner wall of the material temporary storage bucket 301 is fixedly connected with an inclined temporary storage baffle 3011. Figure 4 The inclined temporary storage baffle 3011 extends from the upper left to the lower right, and there is a gap in the lower right edge for material discharge; the temporary storage baffle 3011 and the inner wall of the material temporary storage bucket 301 form a temporary storage chamber for storing materials, which can be adjusted according to the screening rate and the discharge rate to ensure the discharge quantity and meet the needs.

[0047] The feeding device 2 includes a feeding body 204, a control box 203 is fixedly connected to the upper end of the feeding body 204, a feeding hopper 201 is fixedly connected to the upper end of the control box 203, a negative pressure pipe 202 is connected to the side wall of the control box 203, and a valve group 2031 is arranged on the inner wall of the control box 203 to control the conduction state of the feeding hopper 201, wherein the negative pressure pipe 202 is externally connected to a negative pressure device, after closing the valve group 2031, negative pressure can be generated through the negative pressure pipe 202 to drive the gas in the installation body 1 to flow in a directional manner; specifically, the flue gas around the discharge pipe 3021 is sucked in from there, and passes through the material conveying box 302 and the material temporary storage hopper 301 in turn to enter the screening body 6, and finally flows to the negative pressure pipe 202 to realize the flue gas circulation channel; in the process of the flue gas circulating in the flue gas circulation channel, most of the flue gas can be mixed with the crushed gypsum and absorbed, and part of the iron oxide smoke in the flue gas can be adsorbed and finally discharged into the slag bag, thereby reducing the loss of iron; and after the flue gas is absorbed, the impact of the flue gas on the surrounding environment can be reduced, thereby improving 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 spacing and ensure the accurate and stable delivery of gypsum; an inverted funnel is installed at the end of the corrugated pipe to increase the adsorption area at the end and enhance the adsorption effect on the flue gas.

[0048] It should be noted here that the flue gas passage is a U-shaped flue gas circulation passage formed in a bent U-shape. The U-shaped flue gas passage can prolong the contact time between the flue gas and the gypsum, increase the contact area, and improve the absorption effect. At this time, the crushed gypsum particles can also act as an adsorbent to reduce the loss of iron oxide smoke; and the crushed gypsum particles are transported by the spiral conveying blades 303. The gypsum particles are in a relatively full state in the spiral conveying blades 303. The gypsum in the spiral conveying blades 303 has a good filling effect and a high density during the conveying process, which further improves the effect of flue gas absorption.

[0049] Please refer to the attached Figure 6 The material copying assembly 7 is tilted toward the first direction, a storage area is formed between the material copying assembly 7 and the screening body 6, and the material copying assembly 7 is multiple and distributed along the circumference of the inner wall of the screening body 6, Figure 6 The screening body 6 rotates clockwise, and the inclination direction of the material shoveling component 7 forms an acute angle area with the inner wall of the screening body 6 to store the material. During the rotation of the screening body 6, large-sized gypsum particles can be temporarily stored in the formed storage area, which can realize the lifting and transportation of gypsum. When the material shoveling component 7 moves to a predetermined angle position, the gypsum can fall freely between the crushing devices 5 under the action of gravity to realize the crushing and feeding processing.

[0050] The material copying assembly 7 includes a first material copying plate 701 and a second material copying plate 704. A torsion elastic component is connected between the first material copying plate 701 and the second material copying plate 704, which can be a torsion spring. The edge parts at both ends of the first material copying plate 701 are fixedly connected to the limiting sleeve 702, and the edge parts of the second material copying plate 704 are fixedly connected to the limiting rod 703. The two ends of the limiting rod 703 pass through the limiting sleeve 702. There is a gap between the second material copying plate 704 and the first material copying plate 701. The second material copying plate 704 can not only rotate around the end of the first material copying plate 701, but also rotate along the axis direction of the screening body 6. The limiting rod 703 is provided with a control protrusion on its surface, and the limiting sleeve 702 is provided with a curved control groove on its inner wall. The control protrusion can slide in the curved control groove. When the second material-scraping plate 704 moves linearly along the axis of the screening body 6, it can rotate synchronously with the cooperation of the control protrusion and the control groove. The rapid unloading of gypsum can be achieved by controlling its rotation. A control component for controlling the movement of the limiting rod 703 is provided on the inner wall of the installation body 1. The limiting rod 703 is controlled to move at a predetermined position by the control component. Before the limiting rod 703 moves, the second material-scraping plate 704 is in the adjacent Figure 6 The state shown can accommodate the gypsum and allow it to be lifted to a predetermined height; after the limit rod 703 moves, it can overcome the force of the torsion elastic component, allowing the second material-picking plate 704 to rotate in the second direction, the restriction on the gypsum disappears, and the gypsum slides into the crushing device 5 to complete the crushing process.

[0051] As a preferred control method; wherein the control component includes a first magnet 801 and a second magnet 802, and the first magnet 801 and the second magnet 802 are in an attractive or repulsive state according to the state of the control protrusion and the control groove; wherein the first magnet 801 is fixedly connected to the end of the limit rod 703, and the second magnet 802 is fixedly connected to the inner wall of the installation body 1 through the connecting 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; similarly, the above-mentioned control method can select a mechanical method such as a wedge block to realize the control process.

[0052] Finally, it should be noted that the screening body 6 is divided into a first end and a second end according to the direction of feeding. The first end is the end close to the feeding device 2. The inner wall of the mounting body 1 has a storage chamber for accommodating the first end of the screening body 6 to form a descending step to ensure the transportation of materials; an inclined annular baffle 602 is fixed to the second end of the screening body 6, and an opening 6021 is formed in the middle position of the annular baffle 602 for the crushing device 5 to pass through. By setting the annular baffle 602, the gypsum at the second end can be blocked and its movement can be restricted to achieve cyclic crushing, and the two will not interfere with each other; the screening body 6 is tilted as a whole, and the position close to the feeding device 2 is relatively high, so as to realize directional transportation of materials during the rotating screening process and improve the screening and transportation efficiency.

[0053] Working principle: Gypsum is added into the screening body 6 through the feeding device 2. The screening body 6 can screen the gypsum during the rotation process. The gypsum that meets the size requirements falls into the discharging device 3 and is finally discharged from the discharging pipe 3021; ​​the gypsum that does not meet the size requirements can be lifted to a high position under the action of the material shoveling component 7, and falls into the crushing device 5 during the rotation process, and the crushing device 5 completes the crushing processing of large-size gypsum.

[0054] After the first addition of gypsum is completed, the valve group 2031 in the regulating control box 203 is closed. At this time, negative pressure can be generated through the negative pressure pipe 202 to drive the gas to flow in a directional manner. The flue gas around the opening of the discharge pipe 3021 can flow in the opposite direction of the material conveying, so that the flue gas can be mixed with the internal gypsum. The flue gas is absorbed by the gypsum, thereby reducing the iron loss in the slag bag and reducing the impact on the surrounding environment.

[0055] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A process for improving the iron grade of slag magnetic separation, characterized in that: The steps include: S1. Material processing: crush and dry the gypsum, control the water content of the gypsum to less than 1%, and control the particle size of the gypsum to 1cm-2cm; S2, material addition: adding the gypsum processed in S1 and the molten slag into the slag bag for mixing reaction, and controlling the mixing ratio of gypsum to slag to be 1:20-35; S3, slag bag slow cooling: after the S2 material is added, the slag bag in the second step is subjected to a slow cooling process, ventilation cooling, and then water spray cooling, and the slow cooling time is controlled to be 48h-72h; S4, crushing and magnetic separation: the slag bag after slow cooling in S3 is turned over, the slag is crushed and magnetically separated, wherein the crushing particle size is controlled to be 10cm-15cm; Start the negative pressure equipment in S2 to control the directional flow of slag flue gas and mix it with gypsum to achieve adsorption of flue gas; A material adding device is used, comprising a mounting body (1) for conveying gypsum, a feeding device (2) being arranged at a first end of the mounting body (1), a discharging device (3) being arranged at a second end of the mounting body (1), a screening body (6) being arranged inside the mounting body (1) and being rotatable relative to an inner wall of the mounting body (1), the screening body (6) being in a hollow cylindrical shape, a screening area (601) being arranged on a surface of the screening body (6), the discharging device (3) comprising a material conveying box (30 2), the position of the material conveying box (302) corresponds to the position of the screening area (601), a spiral conveying blade (303) is arranged inside the material conveying box (302), a driving device (4) for driving the spiral conveying blade (303) and the screening body (6) to rotate synchronously is arranged on the outside of the installation body (1), a crushing device (5) located inside the screening body (6) is installed on the inner wall of the installation body (1), and a material lifting component (7) for lifting gypsum is fixedly connected to the inner wall of the screening body (6); The feeding device (2) comprises a feeding body (204), the upper end of the feeding body (204) is fixedly connected to a control box (203), the upper end of the control box (203) is fixedly connected to a feeding hopper (201), a side wall of the control box (203) is connected to a negative pressure pipeline (202), and the inner wall of the control box (203) is provided with a valve group (2031) for controlling the conduction state of the feeding hopper (201); The negative pressure pipeline (202) is externally connected to a negative pressure device, and after the valve group (2031) is closed, negative pressure can be generated through the negative pressure pipeline (202) to drive the gas in the installation body (1) to flow in a directional manner.

2. The process for improving the iron grade of slag magnetic separation according to claim 1, characterized in that: The crushing device (5) comprises two crushing installation shafts (502) arranged in parallel, and a plurality of crushing bodies (501) arranged in parallel are installed on the surface of the crushing installation shaft (502). A crushing gap is provided between the two corresponding crushing bodies (501) arranged in parallel, and the plurality of crushing gaps gradually decrease in the direction of material movement. The outer wall of the installation body (1) is provided with a first electric control device (503) for controlling the two crushing installation shafts (502) to rotate synchronously.

3. The process for improving the iron grade of slag magnetic separation according to claim 1, characterized in that: The driving device (4) comprises a first driving shaft located inside the installation body (1); the outer wall of the material conveying box (302) is rotatably connected to a second driving shaft (403); the outer wall of the material conveying box (302) is installed with a second electric control device (404) for controlling the rotation of the second driving shaft (403); the second driving shaft (403) and the first driving shaft are driven via a primary reduction device (402); and the first driving shaft and the screening body (6) are driven via a secondary reduction device (401).

4. The process for improving the iron grade of slag magnetic separation according to claim 1, characterized in that: The upper end of the material conveying box (302) is connected to the outer wall of the installation body (1) via a temporary material storage bucket (301), and an inclined temporary storage baffle (3011) is fixedly connected to the inner wall of the temporary material storage bucket (301).

5. The process for improving the iron grade of slag magnetic separation according to claim 1, characterized in that: The material shaving assembly (7) is arranged to be inclined in a first direction, a storage area is formed between the material shaving assembly (7) and the screening body (6), and the material shaving assembly (7) is in plurality and is distributed along the circumference of the inner wall of the screening body (6).

6. The process for improving the iron grade of slag magnetic separation according to claim 1, characterized in that: The material shaving assembly (7) comprises a first material shaving plate (701) and a second material shaving plate (704); a torsion elastic component is connected between the first material shaving plate (701) and the second material shaving plate (704); edge portions at both ends of the first material shaving plate (701) are fixedly connected to a limiting sleeve (702); edge portions of the second material shaving plate (704) are fixedly connected to a limiting rod (703); both ends of the limiting rod (703) penetrate the limiting sleeve (702); a control protrusion is provided on the surface of the limiting rod (703); a curved control groove is provided on the inner wall of the limiting sleeve (702); and a control component for controlling the movement of the limiting rod (703) is provided on the inner wall of the mounting body (1).

7. The process for improving the iron grade of slag magnetic separation according to claim 6, characterized in that: The control component comprises a first magnet (801) and a second magnet (802), wherein the first magnet (801) is fixedly connected to the end of the limit rod (703), and the second magnet (802) is fixedly connected to the inner wall of the installation body (1) via a connecting workpiece.

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