Method and system for utilizing oil-containing oxide scale

Abstract

The invention provides a utilization method and system of oil-containing oxide scale, and the method comprises the following steps: in the sintering production process, laying a grate-layer material layer on a sintering machine, laying a primary material distribution layer on the grate-layer material layer, and then igniting; after the sintering machine runs for a certain distance, a secondary material distribution layer is distributed on the distributed and ignited primary material distribution layer, and then ignition is carried out; the sintering mixture of the first material distribution layer does not contain oil-containing oxide scales, and the sintering mixture of the second material distribution layer contains oil-containing oxide scales. The method provided by the invention can eliminate the adverse effect of oil substances in the added oil-containing oxide scale on the sintering air draft system; and the explosion risk caused by a low-flash-point oil decomposition product formed by an oil substance can be avoided, and the safety of a sintering system is ensured. According to the method disclosed by the invention, oil-containing oxidized scale resources which cannot be effectively utilized by enterprises are effectively recovered, and potential combustion heat of oil substances in the oil-containing oxidized scale can be utilized, so that the demand consumption of fuel in the sintering mixture is reduced, and the full reutilization of valuable resources in the oil-containing oxidized scale is realized.

Description

Technical Field

[0001] The invention belongs to the technical field of oil-containing iron oxide scale resource processing in iron and steel metallurgy, and more specifically, relates to a method and system for utilizing oil-containing iron oxide scale. Background Art

[0002] Oily scale is a byproduct produced during the hot working of steel billets that is difficult to recycle. During the hot working process, the continuous heating furnace generally heats the steel billets to above 1200°C, and the steel billets produce scale due to oxidation. These scales are generally removed mechanically and hydraulically. During the removal process, the oil and grease used to lubricate the rolls and rollers will mix with the rack cooling water to form oily scale. The oil content fluctuates greatly depending on the hot rolling production line and treatment process.

[0003] In the past few decades, a large amount of this oily iron oxide has accumulated. The iron mass percentage of the oily iron oxide after dehydration is 65% to 70% on average. Because of the high iron content, the oily iron oxide scale can be recycled by further melting or reduction, which has certain economic benefits. Because it contains different oils, the iron oxide scale cannot be directly added to the converter or blast furnace top for use. At present, most companies generally dispose of it through outsourcing, resulting in the loss of ferrous resources. In order to recover ferrous resources, related companies have also conducted many studies and attempts. There are mainly direct sintering ore blending raw material method, briquetting rotary furnace, rotary kiln distillation, roasting, high temperature reduction, etc.

[0004] Among them, the oil-containing iron oxide scale is directly used as a sintering ore raw material. This method seems simple and feasible, but if it is used in large quantities in the current sintering process, there will be great safety risks. Because the oil adsorbed by the iron oxide scale will desorb and distill at a temperature of 400-500℃ or lower. 400-500℃ is the drying and preheating stage of the sintering process. The oxygen content in the sintering exhaust gas is generally low, and there is a lack of combustion conditions for oil under high negative pressure. It enters the sintering exhaust gas in the form of oil and gas. The oil fume is easily condensed and adheres to the dust collector, the main exhaust fan rotor, etc. In addition, if the oil-containing iron oxide scale is used in large quantities or for a long time in the sintering machine, it will form a local concentration of low flash point oil decomposition products, which may lead to explosion risks. Many domestic companies have experienced spontaneous combustion in the dust collector and even flue explosions due to the use of oil-containing iron oxide scale to reduce raw material costs. At present, oil-containing iron oxide scale is rarely used directly in ordinary sintering processes.

[0005] For the briquetting rotary furnace method, some companies use the coarse OG particles produced by steelmaking and iron oxide scale in a certain proportion, add special adhesives, stir and mix them in a strong mixer, and then squeeze them into balls. The finished products will be returned to the steel plant for use. This method also has the following disadvantages: first, the processing cost is high; second, the oil evaporates due to heat during use, which emits an unpleasant odor, polluting the working environment and endangering the health of the workers.

[0006] For the rotary kiln distillation method, the hot rolling sludge is first dehydrated, and then the oil is removed by distillation in a rotary kiln heated by combustion isolation. The hot oil gas is condensed to obtain recovered oil, and the iron scale after oil removal can be recycled. This method is environmentally friendly, but the investment and operating costs are high.

[0007] Treatment of oily iron oxide scale by methods such as roasting and high-temperature reduction also has problems such as large investment and high operating costs, and is not economically sustainable. Summary of the invention

[0008] The purpose of the present invention is to provide a very economical, efficient and safe method and system for utilizing oily iron oxide scale, so that the oily iron oxide scale solid waste does not leave the factory and can be recycled sustainably and economically.

[0009] To achieve the above object, the first aspect of the present invention provides a method for utilizing oil-containing oxidized iron scale, comprising the following steps:

[0010] In the sintering production process, a base material layer is first laid on the sintering machine, and then a primary material layer is laid on the base material layer, and then ignition is carried out;

[0011] After the sintering machine runs for a certain distance, a secondary material distribution layer is laid on the first material distribution layer that has been distributed and ignited, and then ignited;

[0012] The sintering mixture of the first material distribution layer does not contain oil-containing iron oxide scale, and the sintering mixture of the second material distribution layer contains oil-containing iron oxide scale.

[0013] Furthermore, the thickness of the first cloth layer accounts for 65-70% of the total cloth layer thickness, the thickness of the second cloth layer accounts for 30-35% of the total cloth layer thickness, and the total cloth layer thickness is the sum of the thicknesses of the first cloth layer and the second cloth layer.

[0014] Furthermore, the thickness of the primary cloth layer is 400-700 mm, and the thickness of the secondary cloth layer is 200-400 mm.

[0015] Furthermore, the oil-containing iron oxide scale is added in an amount of 1wt% to 15wt% in the sintering mixture of the secondary material distribution layer.

[0016] Furthermore, the sintering mixture of the first material distribution layer and the sintering mixture of the second material distribution layer both include iron-containing material, flux and fuel.

[0017] The second aspect of the present invention provides a system for utilizing oil-containing oxidized iron scale, comprising:

[0018] A draft sintering unit, which includes a sintering machine and a negative pressure draft device;

[0019] A bottom material bin, used for laying a bottom material layer for the sintering machine;

[0020] A first mixture laying unit, comprising a first mixture batching device, a first mixing device and a first mixture bin; the first mixture laying unit is used to lay a first material layer;

[0021] A secondary mixture laying unit, comprising a secondary mixture batching device, a second mixing device and a secondary mixture silo; the secondary mixture laying unit is used to lay a secondary material layer; and

[0022] The ignition unit comprises a primary fabric ignition system and a secondary fabric ignition system; the primary fabric ignition system is used to ignite the primary fabric layer, and the secondary fabric ignition system is used to ignite the secondary fabric layer.

[0023] Furthermore, it also includes a material dividing device, the first mixed material batching device includes a main line batching bin system and a main line batching belt arranged below it; the first mixing device includes a main line primary mixer, a main line primary mixing belt and a main line secondary mixer;

[0024] The main line batching belt conveys the sintered mixed material of the first distribution layer to the main line primary mixer for primary mixing, and then enters the material dividing device to be divided into two parts. One part is conveyed to the main line secondary mixer through the main line first mixing belt for further mixing, and then enters the primary mixing silo.

[0025] Further, the secondary mixed material batching device includes an auxiliary line batching bin system and an auxiliary line batching belt arranged below the system; the second mixing device includes an auxiliary line mixing belt, an auxiliary line primary mixer and an auxiliary line secondary mixer;

[0026] The auxiliary line batching belt conveys the sintered mixture of the secondary distribution layer to the auxiliary line first mixing belt, and at the same time, the sintered mixture of another part of the primary distribution layer from the material distribution device also enters the auxiliary line first mixing belt; the auxiliary line first mixing belt conveys the material on it to the auxiliary line primary mixer for primary mixing, and then enters the auxiliary line secondary mixer for further mixing, and then enters the secondary mixing silo.

[0027] Furthermore, it also includes a material layer oxygen supply device for supplying oxygen to the primary material layer and / or the secondary material layer.

[0028] Furthermore, the main line material distribution bin system and the auxiliary line material distribution bin system both include a plurality of conical storage bins arranged in parallel.

[0029] Compared with the prior art, the present invention has the following technical effects:

[0030] A method for utilizing oil-containing iron oxide of the present invention is to first distribute and ignite a sintering mixture without oil-containing iron oxide on a sintering machine. After a certain distance, the mixed sintering material containing oil-containing iron oxide is distributed and ignited on the sintering machine material layer that has been distributed and ignited, so as to form two combustion zones on the same sintering section at the same time. In this way, the distillation and decomposition products formed by the oil content in the oil-containing iron oxide of the upper sintering mixture after drying and preheating will pass through the first ignited lower combustion zone, and the high temperature of the lower combustion zone will achieve complete combustion of the oil content. On the one hand, it can prevent the oil fume from condensing and sticking to the subsequent dust collector, main exhaust fan rotor and other equipment together, thereby eliminating the adverse effects of the oil content on the sintering exhaust system; on the other hand, it can avoid the explosion risk caused by the low flash point oil decomposition products formed by the oil content, thereby ensuring the safety of the sintering system. In addition, the method of the present invention not only effectively recycles the oil-containing oxidized iron scale of the enterprise, but also the recovery effect is not affected by the oil content, and can achieve large-scale recovery and high economy; the method of the present invention can also utilize the combustion heat of the oil substance in the oil-containing oxidized iron scale, reduce the demand and consumption of fuel in the sintering mixture, and realize the full reuse of valuable resources in the oil-containing oxidized iron scale, turning waste into treasure.

[0031] The utilization system of the oil-containing iron oxide sheet of the present invention lays out the first distribution layer and the second distribution layer respectively through the first mixture distribution unit and the second mixture distribution unit, and then ignites twice through the first material ignition system and the second material ignition system in succession, so as to form two combustion zones on the same sintering section at the same time. In this way, the distillation and decomposition products formed by the oil substance in the oil-containing iron oxide sheet in the secondary distribution layer after drying and preheating will pass through the combustion zone of the first distribution layer that was ignited first, and the complete combustion of the oil substance is achieved through the high-temperature combustion of the combustion zone of the first distribution layer. On the one hand, it can prevent the oil fume from condensing and sticking to the dust collector, the main exhaust fan rotor and other equipment together, reducing or even eliminating the adverse effects of the oil substance on the sintering exhaust system; on the other hand, it can avoid the explosion risk caused by the low flash point oil decomposition products formed by the oil substance, and ensure the safety of the sintering system. In addition, the system of the present invention not only effectively recycles the oil-containing oxidized iron scale of the enterprise, but also the recovery effect is not affected by the oil content, and can achieve large-scale recovery and high economy; the system of the present invention can also utilize the combustion heat of the oil substance in the oil-containing oxidized iron scale to reduce the demand and consumption of fuel in the sintering mixture, thereby achieving full reuse of valuable resources in the oil-containing oxidized iron scale and turning waste into treasure. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0033] Figure 1 A schematic structural diagram of a system for utilizing oil-containing oxidized iron scale provided by an embodiment of the present invention;

[0034] Figure 2 A process flow diagram of a method for utilizing oil-containing oxidized iron scale provided in an embodiment of the present invention.

[0035] Among them, the reference numerals in the figure are:

[0036] 1. Sintering machine, 2. Bottom material bin, 3. First mixing material bin, 4. First material surface ignition system, 5. Material layer oxygen supplement device, 6. Secondary mixing material bin, 7. Secondary material surface ignition system, 8. Bottom material layer, 9. First material distribution layer, 10. Secondary material distribution layer, 11. Main line batching bin system, 12. Main line batching belt, 13. Main line primary mixer, 14. Main line first mixing belt, 15. Main line secondary mixer, 16. Material dividing device, 17. Auxiliary line first mixing belt, 18. Auxiliary line first mixer, 19. Auxiliary line batching bin system, 20. Auxiliary line secondary mixer, 21. Auxiliary line batching belt. DETAILED DESCRIPTION

[0037] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0038] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0039] In this application, the term "and / or" describes the association relationship of associated objects, indicating that there may be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. A and B can be singular or plural. The character " / " generally indicates that the associated objects are in an "or" relationship.

[0040] The terms "first" and "second" are used only for descriptive purposes to distinguish objects such as substances from each other, and should not be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. For example, without departing from the scope of the embodiments of the present application, the first XX may also be referred to as the second XX, and similarly, the second XX may also be referred to as the first XX. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features.

[0041] In a first aspect, an embodiment of the present invention provides a system for utilizing oil-containing oxidized iron scale, the structure of which is as follows: Figure 1As shown, it includes an exhaust sintering unit, a bottom material bunker 2, a primary mixture laying unit, a secondary mixture laying unit and an ignition unit. The exhaust sintering unit includes a sintering machine 1 and a negative pressure exhaust device (not shown in the figure). The negative pressure exhaust device is used to provide an air flow from top to bottom for the sintering machine 1 to provide the oxygen required for sintering; the bottom material bunker 2 is used to lay a bottom material layer 8 for the sintering machine 1. The primary mixture laying unit includes a primary mixture batching device, a first mixing device and a primary mixing bunker 3. The sintered mixture is batched by the primary mixture batching device and mixed and granulated by the first mixing device in sequence and then enters the primary mixing bunker 3. The primary mixture laying unit is used to lay the primary material laying layer 9. The secondary mixture laying unit includes a secondary mixture batching device, a second mixing device and a secondary mixing bunker 6. The sintered mixture is batched by the secondary mixture batching device and mixed and granulated by the second mixing device in sequence and then enters the secondary mixing bunker 6. The secondary mixture laying unit is used to lay the secondary material laying layer 10. The ignition unit comprises a primary fabric ignition system 4 and a secondary fabric ignition system 7 . The primary fabric ignition system 4 is used to ignite the primary fabric layer 9 , and the secondary fabric ignition system 7 is used to ignite the secondary fabric layer 10 .

[0042] The sintering mixture of the first material distribution layer 9 does not contain oil-containing iron oxide scale, while the sintering mixture of the second material distribution layer 10 contains oil-containing iron oxide scale.

[0043] When the sintering machine 1 is in normal production, it runs from left to right. The bottom material bin 2 storing the bottom material with a particle size of 10-20 mm first distributes the bottom material layer 8 with a thickness of about 50 mm, which plays a role in protecting the lower grate of the sintering machine 1 and preventing leakage. After that, the primary mixing bin 3 distributes the primary material layer 9 on the bottom material layer 8, and ignites it for the first time through the primary material surface ignition system 4. After the sintering machine 1 has been running for a period of time, the secondary mixing bin 6 continues to distribute the secondary material layer 10 on the ignited table surface, and ignites it through the secondary material surface ignition system 7. The thickness of the primary material layer 9 and the secondary material layer 10 is adjusted according to the actual situation to ensure that the double-layer sintering end temperature and the sintering process are completed.

[0044] In the embodiment of the present invention, a utilization system of oil-containing oxidized iron scale is used to lay out the first material layer 9 and the second material layer 10 respectively through the first mixture laying unit and the second mixture laying unit, and then ignite twice through the first material ignition system 4 and the second material ignition system 7, so as to form two combustion zones on the same sintering section at the same time. In this way, the distillation and decomposition products formed by the oily substance in the oily oxidized iron scale in the second material layer 10 after drying and preheating will pass through the combustion zone of the first material layer 9 ignited first, and the complete combustion of the oily substance is achieved through the high-temperature combustion of the combustion zone of the first material layer 9. On the one hand, it can prevent the oil fume from condensing and sticking to the subsequent dust collector, the main exhaust fan rotor and other equipment together, and eliminate the adverse effects of the oily substance on the sintering exhaust system; on the other hand, it can avoid the explosion risk caused by the low flash point oil decomposition products formed by the oily substance, and ensure the safety of the sintering system. In addition, the system of the embodiment of the present invention not only effectively recycles the oil-containing oxidized iron scale of the enterprise, and the recovery effect is not affected by the oil content, and can achieve large-scale recovery and high economy; the system of the embodiment of the present invention can also utilize the combustion heat of the oil substance in the oil-containing oxidized iron scale, reduce the demand and consumption of fuel in the sintering mixture, and realize the full reuse of valuable resources in the oil-containing oxidized iron scale, turning waste into treasure.

[0045] Furthermore, the utilization system of oil-containing oxidized iron scale according to the embodiment of the present invention further includes a material dividing device 16, the first mixing material batching device includes a main line batching bin system 11 and a main line batching belt 12 arranged below the main line batching bin system 11; the first mixing device includes a main line primary mixer 13, a main line first mixing belt 14 and a main line secondary mixer 15. The main line batching belt 12 conveys the sintered mixed material of the first material distribution layer 9 to the main line primary mixer 13 for primary mixing, and then enters the material dividing device 16 to be divided into two parts, one part of which is conveyed to the main line secondary mixer 15 through the main line first mixing belt 14 for mixing and granulation again, and then enters the first mixing bin 3.

[0046] Furthermore, the secondary mixed material batching device of the embodiment of the present invention includes an auxiliary line batching bin system 19 and an auxiliary line batching belt 21 arranged thereunder, and the second mixing device includes an auxiliary line mixing belt 17, an auxiliary line primary mixer 18 and an auxiliary line secondary mixer 20. The auxiliary line batching belt 21 conveys the sintered mixed material of the secondary material distribution layer 10 to the auxiliary line mixing belt 17, and at the same time, the sintered mixed material of another part of the primary material distribution layer 9 from the material distribution device 16 also enters the auxiliary line mixing belt 17; the auxiliary line mixing belt 17 conveys the material on it to the auxiliary line primary mixer 18 for primary mixing, and then enters the auxiliary line secondary mixer 20 for mixing and granulation again, and then enters the secondary mixing bin 6.

[0047] Furthermore, a system for utilizing oil-containing oxidized iron scale according to an embodiment of the present invention also includes a material layer oxygen supply device 5, which is used to supply oxygen to the primary material layer 9 and / or the secondary material layer 10, so that the sintering materials on the primary material layer 9 and the secondary material layer 10 can have sufficient oxygen to burn.

[0048] Furthermore, the main line batching bin system 11 and the auxiliary line batching bin system 19 of the embodiment of the present invention both include a plurality of conical storage bins arranged in parallel, and different raw materials can be stored in the plurality of conical storage bins arranged in parallel to meet the batching requirements of multiple raw materials.

[0049] In a second aspect, an embodiment of the present invention further provides a method for utilizing oil-containing oxidized iron scale, which is implemented by the above-mentioned utilization system and includes the following steps:

[0050] In the sintering production process, a base material layer 8 is first laid on the sintering machine 1, and then a first material layer 9 is laid on the base material layer 8 and ignited;

[0051] After the sintering machine 1 runs for a certain distance, a secondary material distribution layer 10 is laid on the primary material distribution layer 9 that has been distributed and ignited, and then ignited;

[0052] The sintering mixture of the first material distribution layer 9 does not contain oil-containing iron oxide scale, and the sintering mixture of the second material distribution layer 10 contains oil-containing iron oxide scale.

[0053] A method for utilizing oil-containing iron oxide in an embodiment of the present invention is to first distribute and ignite a sintering mixture without oil-containing iron oxide on a sintering machine 1, and then distribute and ignite the mixed sintering material containing oil-containing iron oxide on the material layer of the sintering machine 1 that has been distributed and ignited after a certain distance, so as to form two combustion zones on the same sintering section at the same time. In this way, the distillation and decomposition products formed by the oil-containing iron oxide in the oil-containing iron oxide of the upper sintering mixture (i.e., the secondary distribution layer 10) after drying and preheating will pass through the first ignited lower combustion zone, and the complete combustion of the oil-containing substance is achieved through the high-temperature combustion of the lower combustion zone. On the one hand, it can prevent the oil fume from condensing and sticking to the subsequent dust collector, the main exhaust fan rotor and other equipment together, eliminating the adverse effects of the oil-containing substance on the sintering exhaust system; on the other hand, it can avoid the explosion risk caused by the low flash point oil decomposition products formed by the oil-containing substance, and ensure the safety of the sintering system. In addition, the method of the embodiment of the present invention not only effectively recycles the oil-containing oxidized iron scale of the enterprise, and the recovery effect is not affected by the oil content, and can achieve large-scale recovery and high economy; the method of the embodiment of the present invention can also utilize the combustion heat of the oil substance in the oil-containing oxidized iron scale, reduce the demand and consumption of fuel in the sintering mixture, and realize the full reuse of valuable resources in the oil-containing oxidized iron scale, turning waste into treasure.

[0054] Furthermore, the thickness of the first material layer 9 accounts for 65-70% of the total material layer thickness, and the thickness of the second material layer 10 accounts for 30-35% of the total material layer thickness, and the total material layer thickness is the sum of the thickness of the first material layer 9 and the second material layer 10. By controlling the thickness of each material layer, the oil content can be fully burned while ensuring that the double-layer sintering end temperature and the sintering process are completed. For example, the thickness of the first material layer 9 is 400-700 mm, and the thickness of the second material layer 10 is 200-400 mm.

[0055] Furthermore, the particle size of the oil-containing iron oxide scale does not exceed 10 mm, and the amount of the oil-containing iron oxide scale added to the sintering mixture of the secondary material layer 10 is 1wt-15wt%, to ensure that the oil content can be fully burned.

[0056] The sintering mixture of the primary distribution layer 9 and the sintering mixture of the secondary distribution layer 10 of the embodiment of the present invention can adopt conventional sintering material formulas, and the sintering materials include iron-containing materials, flux and fuel, and may also include other recycled auxiliary materials.

[0057] The embodiment of the present invention also provides a process flow diagram of a method for utilizing oil-containing oxidized iron scale, such as Figure 2 As shown, the draft sintering system can prepare two kinds of mixed materials and perform multiple distribution and ignition by setting a separable batching mixing and granulation system and a separable distribution and ignition system in the sintering batching system. The main batching system includes all normal batching raw materials (i.e., sintering raw materials), including iron-containing materials, flux, fuel and other recycled auxiliary materials, but does not contain oil-containing oxidized iron sheets. The auxiliary batching system includes an oil-containing oxidized iron sheet warehouse, etc. The main batching line unloads materials according to a preset ratio and enters the mixing system A for mixing. Specifically, it first enters the primary mixer for water addition and mixing. The mixed materials are divided into two parts according to the metering requirements through the dividing device. One part continues to enter the secondary mixer of the main line for enhanced mixing and granulation to form the main line mixed material. The main line generally adopts a two-stage mixer mode. The other part of the primary mixing material is collected with the oil-containing oxidized iron sheets of the auxiliary line batching and then enters the mixing system B for mixing and granulation to form the auxiliary line mixed material. The two kinds of mixed materials enter and correspond to different distribution systems (distribution system A and distribution system B) and ignition systems (ignition system A and ignition system B) on the sintering machine respectively. The auxiliary line generally adopts a powerful mixer plus a mixer mode. The main line mixture without oil-containing oxidized iron scale is in front and enters the first mixing bin, and the auxiliary line mixture with oil-containing oxidized iron scale is in the back and enters the secondary mixing bin.

[0058] Two specific embodiments are provided below to illustrate a method and system for utilizing oil-containing oxidized iron scale according to the present invention.

[0059] Example 1

[0060] use Figure 1 The utilization system of oily iron oxide scale shown in the figure, wherein the sintering machine 1 is a 300㎡ sintering machine system with a feeding capacity of 650t / h. The sintering mixture of the secondary material distribution layer 10 prepared by the auxiliary line batching bin system 19 contains the following components in mass percentage: mixed ore 44.7%, limestone powder 4.4%, dolomite 5.0%, metallurgical lime powder 3.5%, fuel 4.0%, oily iron oxide scale 1%, steel slag 1%, dust removal ash 0.9%, blast furnace gas ash 1.5%, internal return powder 18%, and external return powder 16%.

[0061] 11 is the main line batching bin system, which prepares the above-mentioned other production preparation raw materials except the oil-containing oxidized iron scale, and 19 is the auxiliary line batching bin system, which prepares the sintering mixture including the recovered oil-containing oxidized iron scale. Each batching raw material is quantitatively discharged according to the computer design ratio in the main line batching bin system 11 and the auxiliary line batching bin system 19 respectively. The main line batching is collected by the main line batching belt 12 and enters the main line primary mixer 13 for full mixing and water addition. The online material distribution device 16 distributes the material amount according to the production ratio requirements. 70% of the main mixture enters the main line, and the material is transported to the primary mixing bin 3 on the upper part of the sintering machine 1 after enhanced mixing and granulation by the main line secondary mixer 15. 30% of the main mixture and the oil-containing oxidized iron scale discharged from the auxiliary line are collected and successively enter the auxiliary line primary mixer 18 and the auxiliary line secondary mixer 20 for mixing and granulation, and then sent to the secondary mixing bin 6 through the conveying system.

[0062] When the sintering machine 1 is in normal production, it runs from left to right. The bottom material bin 2 storing the bottom material with a particle size of 10-20 mm first distributes the bottom material layer 8 with a thickness of about 50 mm, which plays a role in protecting the lower grate and preventing leakage. The first mixing material bin 3 distributes the first distribution layer 9 accounting for 70% of the total material layer height through the distribution system, and is first ignited through the first material surface ignition system 4. After a period of time, the secondary mixing material bin 6 continues to distribute the secondary distribution layer 10 accounting for 30% of the total material layer height on the ignited table surface, and is ignited through the secondary material surface ignition system 7.

[0063] Example 2

[0064] use Figure 1 The utilization system of oily iron oxide scale shown in the figure, wherein the sintering machine 1 is a 300㎡ sintering machine system with a feeding capacity of 650t / h. The sintering mixture of the secondary material distribution layer 10 prepared by the auxiliary line batching bin system 19 contains the following components in mass percentage: mixed ore 43.7%, limestone powder 4.4%, dolomite 5.0%, metallurgical lime powder 3.5%, fuel 4.0%, oily iron oxide scale 2%, steel slag 1%, dust removal ash 0.9%, blast furnace gas ash 1.5%, internal return powder 18%, and external return powder 16%.

[0065] 11 is the main line batching bin system, which prepares the above-mentioned other production preparation raw materials except the oil-containing oxidized iron scale, and 19 is the auxiliary line batching bin system, which prepares the sintering mixture including the recovered oil-containing oxidized iron scale. Each batching raw material is quantitatively discharged according to the computer design ratio in the main line batching bin system 11 and the auxiliary line batching bin system 19 respectively. The main line batching is collected by the main line batching belt 12 and enters the main line primary mixer 13 for full mixing and water addition. The online material distribution device 16 distributes the material amount according to the production ratio requirements. 65% of the main mixture enters the main line, and the material is transported to the primary mixing bin 3 on the upper part of the sintering machine 1 after enhanced mixing and granulation by the main line secondary mixer 15. 35% of the main mixture and the oil-containing oxidized iron scale discharged from the auxiliary line are collected and successively enter the auxiliary line primary mixer 18 and the auxiliary line secondary mixer 20 for mixing and granulation, and then sent to the secondary mixing bin 6 through the conveying system.

[0066] When the sintering machine 1 is in normal production, it runs from left to right. The bottom material bin 2 storing the bottom material with a particle size of 10-20 mm first distributes the bottom material layer 8 with a thickness of about 50 mm, which plays a role in protecting the lower grate and preventing leakage. The first mixing material bin 3 distributes the first distribution layer 9 accounting for 65% of the total material layer height through the distribution system, and ignites it for the first time through the first material surface ignition system 4. After a period of time, the secondary mixing material bin 6 continues to distribute the secondary distribution layer 10 accounting for 35% of the total material layer height on the ignited table surface, and ignites it through the secondary material surface ignition system 7.

[0067] Assuming that 50,000 tons of oily oxidized iron scale are processed annually, and the profit increase is 200 yuan / ton per ton of oily oxidized iron scale, the annual profit increase is 10 million yuan.

[0068] The method and system for utilizing oil-containing iron oxide scale in the embodiments of the present invention solve the problem of resource recovery and utilization of a large amount of oil-containing iron oxide scale in steel enterprises. The process route is economical and safe. The use of high-iron-content iron oxide scale can also improve the grade of sintered ore, reduce solid fuel consumption in sintering materials, and reduce the cost of sintering raw materials.

[0069] The method and system for utilizing oil-containing oxidized iron scale in the embodiments of the present invention solve the long-standing problem of how to economically, efficiently and safely handle the resources of oil-containing oxidized iron scale, and can effectively solve the current problems of difficulty in disposing of oil-containing oxidized iron scale and high operating costs, realize the transformation of waste into treasure, achieve resource utilization and harmlessness, achieve no solid waste leaving the factory, achieve green production, and promote the construction of "waste-free enterprises" and "waste-free cities".

[0070] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present invention. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the present invention patent shall be subject to the attached claims.

Claims

1. A method for utilizing oil-containing oxidized iron scale, characterized in that: The following steps are involved: In the sintering production process, a base material layer is first laid on the sintering machine, and then a primary material layer is laid on the base material layer, and then ignition is carried out; After the sintering machine runs for a certain distance, a secondary material distribution layer is laid on the first material distribution layer that has been distributed and ignited, and then ignited; The sintering mixture of the first material distribution layer does not contain oil-containing iron oxide scale, and the sintering mixture of the second material distribution layer contains oil-containing iron oxide scale.

2. The method for utilizing oil-containing oxidized iron scale according to claim 1, characterized in that: The thickness of the first cloth layer accounts for 65-70% of the total cloth layer thickness, the thickness of the second cloth layer accounts for 30-35% of the total cloth layer thickness, and the total cloth layer thickness is the sum of the thickness of the first cloth layer and the second cloth layer.

3. The method for utilizing oil-containing oxidized iron scale according to claim 2, characterized in that: The thickness of the primary cloth layer is 400-700 mm, and the thickness of the secondary cloth layer is 200-400 mm.

4. The method for utilizing oil-containing oxidized iron scale according to claim 1, characterized in that: The oil-containing iron oxide scale is added in an amount of 1 to 15 wt % in the sintering mixture of the secondary material distribution layer.

5. A method for utilizing oil-containing oxidized iron scale according to any one of claims 1 to 4, characterized in that: The sintering mixture of the first material distribution layer and the sintering mixture of the second material distribution layer both include iron-containing material, flux and fuel.

6. A system for utilizing oil-containing oxidized iron scale, characterized in that: include: A draft sintering unit, which includes a sintering machine and a negative pressure draft device; A bottom material bin, used for laying a bottom material layer for the sintering machine; A first mixture laying unit, comprising a first mixture batching device, a first mixing device and a first mixture bin; the first mixture laying unit is used to lay a first material layer; A secondary mixture laying unit, comprising a secondary mixture batching device, a second mixing device and a secondary mixture silo; the secondary mixture laying unit is used to lay a secondary material layer; as well as The ignition unit comprises a primary fabric ignition system and a secondary fabric ignition system; the primary fabric ignition system is used to ignite the primary fabric layer, and the secondary fabric ignition system is used to ignite the secondary fabric layer.

7. The system for utilizing oil-containing oxidized iron scale according to claim 6, characterized in that: It also includes a material distribution device, the first mixed material batching device includes a main line batching bin system and a main line batching belt arranged below it; the first mixing device includes a main line primary mixer, a main line mixing belt and a main line secondary mixer; The main line batching belt conveys the sintered mixed material of the first distribution layer to the main line primary mixer for primary mixing, and then enters the material dividing device to be divided into two parts. One part is conveyed to the main line secondary mixer through the main line first mixing belt for further mixing, and then enters the primary mixing silo.

8. The system for utilizing oil-containing oxidized iron scale according to claim 7, characterized in that: The secondary mixed material batching device includes an auxiliary line batching bin system and an auxiliary line batching belt arranged below the system; the second mixing device includes an auxiliary line mixing belt, an auxiliary line primary mixer and an auxiliary line secondary mixer; The auxiliary line batching belt conveys the sintered mixture of the secondary distribution layer to the auxiliary line first mixing belt, and at the same time, the sintered mixture of another part of the primary distribution layer from the material distribution device also enters the auxiliary line first mixing belt; the auxiliary line first mixing belt conveys the material on it to the auxiliary line primary mixer for primary mixing, and then enters the auxiliary line secondary mixer for further mixing, and then enters the secondary mixing silo.

9. The system for utilizing oil-containing oxidized iron scale according to claim 6, characterized in that: It also includes a material layer oxygen supplement device for supplementing oxygen to the primary material layer and / or the secondary material layer.

10. The system for utilizing oil-containing oxidized iron scale according to claim 8, characterized in that: The main line material distribution bin system and the auxiliary line material distribution bin system both include a plurality of conical storage bins arranged in parallel.

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