Method for smelting solid waste in an electric furnace in a synergic process

Abstract

The application relates to the technical field of blast furnace ironmaking, and particularly relates to a method for electric furnace smelting and solid waste cooperative treatment. The method comprises the following steps: pre-treating electric furnace oxidized slag to obtain electric furnace oxidized slag micro powder; first mixing the electric furnace oxidized slag micro powder, electric furnace dust removal ash and water, and controlling the proportion of the electric furnace oxidized slag micro powder and the electric furnace dust removal ash, and then standing to obtain first material; second mixing the first material, low-rank coal and waste graphite electrode, and controlling the proportion of the first material, the low-rank coal and the waste graphite electrode, and then performing balling treatment to obtain carbon-internal-proportioning pellets; performing reduction treatment on the carbon-internal-proportioning pellets, and controlling the process parameters of the reduction treatment to obtain metallized pellets and zinc oxide powder; and performing grinding and magnetic separation on the metallized pellets to obtain metallic iron powder and active tailings. The application solves the technical problems of low Fe recovery rate of existing electric furnace slag and low Zn element recovery rate of electric furnace dust removal ash.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of blast furnace ironmaking, and particularly relates to a method for electric furnace smelting and solid waste cooperative treatment. BACKGROUND

[0002] In the electric furnace smelting process, a large amount of electric furnace slag and electric furnace dust removal ash are generated, and the iron content in the electric furnace oxidation slag is as high as 30%. According to the data, the electric furnace slag production is 10-15% of the steel production, which is divided into oxidation slag and reduction slag. Among them, the oxidation slag accounts for about 90% of the total amount of electric furnace slag, contains high FeO and CaO, and the TFe content is about 30%, and the CaO content is 30-50%. At present, the main way of electric furnace slag treatment is iron selection. Through crushing, magnetic separation and screening separation technology, the slag steel of each particle size is recovered. Generally, the finer the particle size of the steel slag is crushed, the higher the recovery rate is. The slag steel selected by the magnetic separation generally contains more than 55% of iron, and most of the slag steel with high iron grade can be directly used as a raw material for steelmaking and ironmaking.

[0003] At present, only a small amount of slag steel and part of the magnetic iron can be recovered through the beneficiation process, and the iron content in the electric furnace tailings is still as high as more than 25%. Most of this part of the tailings is directly stored and is difficult to be economically and effectively treated. On the other hand, the electric furnace dust removal ash production is about 20 kg / t of steel, which contains not only high Fe element but also 5-20% of Zn element, and has high recycling value. The electric furnace dust removal ash usually adopts high-temperature reduction and volatilization, which has the problems of easy melting and pulverization of materials, and further causes low Zn removal rate and low iron metallization rate. Therefore, at present, there is a lack of a method for reducing and extracting iron from these two typical electric furnace solid wastes and cooperatively removing Zn. SUMMARY

[0004] The present application provides a method for electric furnace smelting and solid waste cooperative treatment to solve the technical problems of low Fe recovery rate of the existing electric furnace slag and low Zn element recovery rate of the electric furnace dust removal ash.

[0005] In a first aspect, the present application provides a method for electric furnace smelting and solid waste cooperative treatment, which comprises:

[0006] The electric furnace oxidation slag is pretreated to obtain electric furnace oxidation slag micro powder; wherein the electric furnace oxidation slag micro powder has a target specific surface area;

[0007] The electric furnace oxidation slag micro powder and the electric furnace dust removal ash are first mixed with water, and the ratio of the electric furnace oxidation slag micro powder and the electric furnace dust removal ash is controlled, and then the first material is obtained by standing;

[0008] The first material, the low-rank coal and the waste graphite electrode are secondly mixed, and the ratio of the first material, the low-rank coal and the waste graphite electrode is controlled, and then the internal carbon-containing pellet is obtained by pelletizing treatment.

[0009] The internal carbon-containing balling is subjected to a reduction treatment, and process parameters of the reduction treatment are controlled to obtain metallized pellets and zinc oxide powder;

[0010] The metallized pellets are subjected to grinding and magnetic separation to obtain metallic iron powder and active tailings.

[0011] Optionally, the target specific surface area is 200-600 m 2 / kg.

[0012] Optionally, the target specific surface area is 400-600 m 2 / kg.

[0013] Optionally, the water content in the first material is 8-20 wt.%.

[0014] Optionally, the standing time is >8 h.

[0015] Optionally, the ratio of the first material, the low-rank coal and the waste graphite electrode is 1:0.05-0.3:0.1-0.3.

[0016] Optionally, the ratio of the first material, the low-rank coal and the waste graphite electrode is 1:0.05-0.1:0.15-0.25.

[0017] Optionally, the diameter of the internal carbon-containing balling is 6-12 mm.

[0018] Optionally, the process parameters of the reduction treatment include a reduction temperature of 1150-1350℃.

[0019] Optionally, the process parameters of the reduction treatment include a reduction time of 15-40 min.

[0020] The above technical solutions provided by the embodiments of the present application have the following advantages compared with the prior art:

[0021] The method for treating solid waste produced by electric furnace smelting provided by the embodiment of the application reduces the electric furnace oxidized slag and the electric furnace dust, and adjusts the ingredients according to the proportion of the two kinds of solid waste discharged in the electric furnace production process to realize the collaborative consumption. The iron in the electric furnace oxidized slag can be recovered, and the Zn, Pb, K, Na and Fe elements in the electric furnace dust can be additionally recovered to increase the overall economic benefits, and the active tail slag can be obtained for the preparation of cementitious materials to realize the consumption of the two kinds of electric furnace solid waste. After the electric furnace oxidized slag with a high melting point and the electric furnace dust are mixed and proportioned, the melting point of the pellets can be significantly improved, the melting and bonding phenomenon that occurs when the electric furnace dust is reduced alone can be effectively alleviated, the volatilization rate of Zn is improved, and the production and operation of the industrial reduction furnace are facilitated. Low-rank coal and waste graphite electrodes produced by electric furnace smelting are used as reducing agents to treat waste with waste and reduce the cost of reduction. In the method, the metallization rate of the pellets can reach more than 85%, and the removal rate of Zn can reach more than 90%. In the above grinding and magnetic separation process, the iron grade of the metallic iron powder can reach more than 75%, the TFe content in the active tail slag is less than 14%, and the MFe content is less than 1.2%, which can be used as a cement mixture to produce solid waste cementitious materials. BRIEF DESCRIPTION OF DRAWINGS

[0022] The drawings incorporated into the specification and constituting a part of the specification show embodiments consistent with the application and, together with the specification, serve to explain the principles of the application.

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced. Obviously, other drawings can also be obtained by those skilled in the art without creative labor.

[0024] Figure 1 A flowchart of a method for treating solid waste produced by electric furnace smelting provided by the embodiment of the application. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solutions and advantages of the embodiments of the application clearer, the technical solutions in the embodiments of the application will be described clearly and completely in combination with the drawings in the embodiments of the application. Obviously, the described embodiments are part of the embodiments of the application, rather than all the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the application.

[0026] Various embodiments of the present application can exist in a range of forms; it should be understood that the description in a range form is merely for the convenience and brevity, and should not be understood as a hard limitation on the scope of the present application; therefore, it should be considered that all possible sub-ranges and single values within the range have been specifically disclosed. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single values within the range, such as 1, 2, 3, 4, 5, and 6, which applies to any range. In addition, whenever a numerical range is indicated herein, any cited number (fraction or integer) within the indicated range is included.

[0027] In the present application, the orientation words such as "upper" and "lower" are specifically the directions of the drawing surface in the drawings, unless otherwise stated. In addition, in the description of the present application, the terms "include", "contain" and the like mean "include but are not limited to". In the present text, relational terms such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. In the present text, "and / or" describes the relationship between the associated objects, which means that there can be three relationships, for example, A and / or B can represent the cases of A alone, A and B together, and B alone. Where A and B can be singular or plural. In the present text, "one or more" means one or more, and "multiple" means two or more. "At least one", "at least one of the following" or the like means any combination of the items, including any combination of single or multiple items. For example, "at least one of a, b, or c", or "at least one of a, b, and c", can mean a, b, c, a-b (i.e. a and b), a-c, b-c, or a-b-c, where a, b, and c can be single or multiple.

[0028] Unless otherwise specifically stated, the various raw materials, reagents, instruments and equipment used in the present application can be purchased on the market or can be prepared by existing methods.

[0029] In a first aspect, the present application provides a method for smelting solid waste in an electric furnace, please refer to Figure 1 , the method comprises:

[0030] S1, pretreating the electric furnace oxidized slag to obtain electric furnace oxidized slag micro powder; wherein the electric furnace oxidized slag micro powder has a target particle size and a target specific surface area;

[0031] In some embodiments, the target specific surface area is 200-600 m 2 / kg.

[0032] In some embodiments, the target specific surface area is 400-600 m 2 / kg.

[0033] The electric furnace oxidized slag is classified and crushed, and slag steel is selected. The electric furnace slag after the slag steel is selected is further ground to obtain electric furnace oxidized slag powder. The specific surface area of the electric furnace oxidized slag powder is 200-600 m 2 / kg. Positive effect: can significantly improve the dissociation of iron and zinc minerals and other gangue components such as active calcium oxide, on the one hand, can promote the reduction of fine particle oxidized iron phase, and on the other hand, is conducive to realizing the rapid digestion of active calcium oxide in the oxidized slag in a low water consumption and short time. If the specific surface area is too small, it is not conducive to the reduction of fine particle oxidized iron in the slag to a certain extent, and also not conducive to the balling rate of the subsequent pelletizing. If the specific surface area is too large, it will increase the grinding energy consumption of the electric furnace oxidized slag to a certain extent. Specifically, the specific surface area of the electric furnace oxidized slag powder can be 200 m 2 / kg, 400 m 2 / kg, 600 m 2 / kg, etc., preferably the specific surface area is 400-600 m 2 / kg. The content of the electric furnace oxidized slag powder with a particle size of 0.15 mm in the above electric furnace oxidized slag powder is greater than 50%.

[0034] S2, the electric furnace oxidized slag powder and the electric furnace dust are mixed with water, and the ratio of the electric furnace oxidized slag powder and the electric furnace dust is controlled, and then the first material is obtained by standing.

[0035] In some embodiments, the water content in the first material is 8-20 wt%.

[0036] The positive effect of controlling the water content in the first material to be 8-20 wt%: is conducive to reducing the powdering of the pellet and improving the metallization rate of the reduction process. If the water content is too low, the active calcium oxide in the material will not be completely digested to a certain extent, which will affect the strength of the pellet. If the water content is too high, additional drying devices need to be added to a certain extent. Specifically, the water content in the first material can be 8 wt%, 12 wt%, 16 wt%, 20 wt%, etc.

[0037] In some embodiments, the standing time is 8 h.

[0038] The positive effect of controlling the standing time to be >8h: the free active calcium oxide in the electric furnace dust and the electric furnace oxidized slag powder can be fully digested, and the volume expansion of the free calcium in the subsequent balling process can be avoided. If the standing time is too short, the digestion degree of the free calcium oxide will be reduced to a certain extent, and the balling of the pellets will be caused. Specifically, the standing time can be 9h, 10h, 12h, etc.

[0039] S3, the first material, low-rank coal and waste graphite electrode are secondly mixed, and the ratio of the first material, the low-rank coal and the waste graphite electrode is controlled, and then balling treatment is performed to obtain the carbon-containing pellets inside;

[0040] In some embodiments, the ratio of the first material, the low-rank coal and the waste graphite electrode is 1:0.05-0.3:0.1-0.3.

[0041] In some embodiments, the ratio of the first material, the low-rank coal and the waste graphite electrode is 1:0.05-0.1:0.15-0.25.

[0042] The balling treatment is performed on the disc balling machine, and the ratio of the first material, the low-rank coal and the waste graphite electrode is controlled to be 1:0.05-0.3:0.1-0.3. The positive effect: the porosity of the pellets can be improved, the air permeability can be improved, and the continuous reducing atmosphere can be ensured. The amount of low-rank coal can significantly increase the porosity and air permeability of the pellets, change the agglomeration behavior of the metallic iron particles in the pellets, and promote the volatilization of Zn, Pb, K, Na and other elements in the electric furnace dust. If the content of low-rank coal is too high, the pellets will be easily pulverized to a certain extent. If the content of low-rank coal is too low, the volatilization will not be promoted to a certain extent. If the content of waste graphite electrode is too high, the reduction iron phase will be hindered to a certain extent, and the grade of the magnetic separation iron powder will be affected. If the content of waste graphite electrode is too low, the reducing atmosphere will be insufficient to a certain extent. The particle size of the low-rank coal and the waste graphite electrode is between 0.074mm and 0.15mm, which is beneficial to balling. Specifically, the ratio of the first material, the low-rank coal and the waste graphite electrode can be 1:0.05:0.1, 1:0.1:0.2, 1:0.3:0.3, etc., and preferably the ratio is 1:0.05-0.1:0.15-0.25.

[0043] In some embodiments, the diameter of the carbon-containing pellets inside is 6-12mm.

[0044] The positive effect of controlling the diameter size of the carbon-in-pellet to be 6-12 mm: by preparing the pellet size in the target range, the carbon burn loss can be controlled, the carbon in the pellet can act more on the reduction reaction, a continuous reducing atmosphere is provided for the pellet, and the metallization rate and dezincification rate are improved. If the diameter size of the carbon-in-pellet is too large, the volatilization of Zn, Pb, K, Na and other elements will be adversely affected to some extent; if the diameter size of the carbon-in-pellet is too small, the carbon burn loss will be too large to some extent, which will cause a shortage of reducing agent and reduce the reduction rate. Specifically, the diameter range of the carbon-in-pellet can be controlled to be 6-8 mm, 8-10 mm, 10-12 mm, etc. by screening. The water content in the above carbon-in-pellet is 12-14 wt%.

[0045] S4, performing a reduction treatment on the carbon-in-pellet, and controlling the process parameters of the reduction treatment to obtain metallized pellets and zinc oxide powder;

[0046] In some embodiments, the process parameters of the reduction treatment include that the reduction temperature is 1150-1350°C.

[0047] In some embodiments, the process parameters of the reduction treatment include that the reduction time is 15-40 min.

[0048] The positive effect of controlling the reduction temperature to be 1150-1350°C and or the reduction time to be 15-40 min: to ensure sufficient reduction of the pellets. If the reduction temperature is too high or the reduction time is too long, the pellets will be oxidized again to some extent and the energy consumption will be increased; if the reduction temperature is too low or the reduction time is too short, the metallization rate, the magnetic separation iron grade and the volatilization rate of Zn will be reduced to some extent. Specifically, the reduction temperature can be 1150°C, 1200°C, 1250°C, 1300°C, 1350°C, etc., and the reduction time can be 15 min, 20 min, 25 min, 30 min, 40 min, etc. Thus, the metallization rate of the pellets can reach more than 85%, and the removal rate of Zn can reach more than 90%.

[0049] S5, performing grinding and magnetic separation on the metallized pellets to obtain metallic iron powder and active tailings.

[0050] The reduced metallized pellets are broken after water quenching and cooling, and grinding and magnetic separation is performed, wherein the strength of the magnetic separation is 800-2500 Oe. Metallic iron powder and active tailings are obtained after magnetic separation. The iron grade of the metallic iron powder can reach more than 75 wt%, and after briquetting, it can be returned to the electric furnace for steelmaking; the TFe in the active tailings is <14%, and the MFe content is <1.2%, which can be used as a cement admixture to produce solid waste cementitious materials.

[0051] The present application will be further described below in conjunction with specific examples. It should be understood that these examples are intended to illustrate the present application only and are not intended to limit the scope of the present application. The experimental methods in the following examples where specific conditions are not specified are usually measured in accordance with national standards. If there are no corresponding national standards, then the methods are carried out in accordance with general international standards, conventional conditions, or according to the conditions recommended by the manufacturer.

[0052] Example 1

[0053] The electric furnace slag is crushed, the slag steel is separated and then ground to a specific surface area of ​​400m 2 / kg, electric furnace slag powder and electric furnace dust ash are mixed in a ratio of 100:20, water is added to 15% moisture, and the mixture is allowed to stand for 12 hours to obtain a digested first material containing 36.33% Fe2O3, 28.2% CaO, and 2.1% ZnO. The first material is then mixed with waste graphite electrodes and low-rank coal in a ratio of 100:15:5 and pelletized to a pellet size of 10-12mm to obtain internal carbon pellets. The pellets are then dried to a moisture content of less than 5%. The dried pellets are reduced in a reduction furnace at 1350°C for 20 minutes. The zinc, lead, potassium, and sodium compounds in the electric furnace dust ash are volatilized into the gas phase through reduction. Secondary dust is collected through bag filters. After dezincification, the pellets have a metallization rate of 91% and a zinc removal rate of 96%. A magnetic separation step yields metallic iron powder with an iron grade of 78%. The tailings contain 8.8% TFe and 0.3% MFe, which can be mixed with fly ash, desulfurized gypsum, bentonite and other silica-calcium materials to produce solid waste cementitious materials.

[0054] Example 2

[0055] The electric furnace slag is crushed, the slag steel is separated and then ground to a specific surface area of ​​500m 2 / kg, electric furnace slag powder and electric furnace dust ash are mixed in a ratio of 100:30, water is added to 15% moisture, and the mixture is allowed to stand for 12 hours to obtain a digested first material containing 38.9% Fe2O3, 26.4% CaO, and 2.6% ZnO. The first material is then mixed with waste graphite electrodes and low-rank coal in a ratio of 100:15:10 and pelletized to a size of 6-8mm to obtain internally carbonized pellets. The pellets are then dried to a moisture content of less than 5%. The dried pellets are reduced in a reduction furnace at 1250°C for 25 minutes. The zinc, lead, potassium, and sodium compounds in the electric furnace dust ash are volatilized into the gas phase through reduction. Secondary dust is collected through bag filters. After dezincification, the pellets have a metallization rate of 87% and a zinc removal rate of 97%. A magnetic separation step yields metallic iron powder with an iron grade of 76.2%. The TFe content in the tailings is 10.3% and the MFe content is 0.5%. It can be mixed with fly ash, desulfurization gypsum, bentonite and other silicon-calcium materials to produce solid waste cementitious materials.

[0056] Example 3

[0057] The electric furnace slag is crushed, the slag steel is separated and then ground to a specific surface area of ​​500m 2 / kg, electric furnace slag powder and electric furnace dust ash are mixed in a ratio of 100:30, water is added to 15% moisture, and the mixture is allowed to stand for 12 hours to obtain a digested first material containing 38.9% Fe2O3, 26.4% CaO, and 2.6% ZnO. The first material is then mixed with waste graphite electrodes and low-rank coal in a ratio of 100:10:15 and pelletized to a size of 6-8mm to obtain carbon-infused pellets. The pellets are then dried to a moisture content of less than 5%. The dried pellets are reduced in a reduction furnace at 1200°C for 30 minutes. The zinc, lead, potassium, and sodium compounds in the electric furnace dust ash are volatilized into the gas phase through reduction. Secondary dust is collected through bag filters. The dezincified pellets have a metallization rate of 80% and a zinc removal rate of 93%. A magnetic separation step yields metallic iron powder with an iron grade of 75%. The TFe content in the tailings is 11.5% and the MFe content is 0.5%. It can be mixed with fly ash, desulfurization gypsum, bentonite and other silicon-calcium materials to produce solid waste cementitious materials.

[0058] Example 4

[0059] The electric furnace slag is crushed, the slag steel is separated and then ground to a specific surface area of ​​200m 2 / kg, electric furnace slag powder and electric furnace dust ash are mixed in a ratio of 100:30, water is added to 15% moisture, and the mixture is allowed to stand for 12 hours to obtain a digested first material containing 38.9% Fe2O3, 26.4% CaO, and 2.6% ZnO. The first material is then mixed with waste graphite electrodes and low-rank coal in a ratio of 100:15:10 and pelletized to a size of 6-8mm to obtain carbon-infused pellets. The pellets are then dried to a moisture content of less than 5%. The dried pellets are reduced in a reduction furnace at 1250°C for 25 minutes. The zinc, lead, potassium, and sodium compounds in the electric furnace dust ash are volatilized into the gas phase through reduction. Secondary dust is collected through bag filters. The dezincified pellets have a metallization rate of 72% and a zinc removal rate of 89%. A magnetic separation step yields metallic iron powder with an iron grade of 70.2%. The TFe content in the tailings is 14% and the MFe content is 1.2%. It can be mixed with fly ash, desulfurization gypsum, bentonite and other silicon-calcium materials to produce solid waste cementitious materials.

[0060] Example 5

[0061] The electric furnace slag is crushed, the slag steel is separated and then ground to a specific surface area of ​​300m 2 / kg, the electric furnace oxidized slag powder and the electric furnace dust are mixed according to 100:30, water is added to 20% moisture, and the mixture is left for 9h to obtain the first material after digestion, the Fe2O3 in the first material is 38.9%, the CaO is 26.4%, and the ZnO is 2.6%. Then the first material, waste graphite electrode and low-rank coal are mixed and balling according to 100:15:10, the ball size is 10-12mm, the carbon-containing ball is obtained, and the ball is dried to less than 5% moisture. The dried ball is reduced in a reduction furnace, the reduction temperature is 1350°C, the reduction time is 15min, the zinc, lead, potassium and sodium compounds in the electric furnace dust volatilize into the gas phase by reduction, the secondary dust is collected by bag dust collection, the metallization rate of the zinc-removed ball is 78%, and the zinc removal rate is 93%. The iron powder with an iron grade of 75% is obtained by one-stage magnetic separation. The TFe in the tailings is 12.5%, the MFe content is 0.7%, and the tailings can be mixed with fly ash, desulfurization gypsum, bentonite and other siliceous and calcareous materials to produce solid waste cementitious materials.

[0062] Example 6

[0063] The electric furnace oxidized slag is crushed, the slag steel is separated out, and then ground to a specific surface area of 600m 2 / kg, the electric furnace oxidized slag powder and the electric furnace dust are mixed according to 100:30, water is added to 20% moisture, and the mixture is left for 9h to obtain the first material after digestion, the Fe2O3 in the first material is 38.9%, the CaO is 26.4%, and the ZnO is 2.6%. Then the first material, waste graphite electrode and low-rank coal are mixed and balling according to 100:15:10, the ball size is 10-12mm, the carbon-containing ball is obtained, and the ball is dried to less than 5% moisture. The dried ball is reduced in a reduction furnace, the reduction temperature is 1350°C, the reduction time is 15min, the zinc, lead, potassium and sodium compounds in the electric furnace dust volatilize into the gas phase by reduction, the secondary dust is collected by bag dust collection, the metallization rate of the zinc-removed ball is 78%, and the zinc removal rate is 93%. The iron powder with an iron grade of 75% is obtained by one-stage magnetic separation. The TFe in the tailings is 12.5%, the MFe content is 0.7%, and the tailings can be mixed with fly ash, desulfurization gypsum, bentonite and other siliceous and calcareous materials to produce solid waste cementitious materials.

[0064] Comparative Example 1

[0065] The electric furnace oxidized slag is crushed, the slag steel is separated out, and then ground to a specific surface area of 100m 2 / kg, the electric furnace oxidized slag powder and the electric furnace dust are mixed according to 100:20, water is added to 15% moisture, and the mixture is left for 12 hours to obtain the first material after digestion, the Fe2O3 in the first material is 36.33%, the CaO is 28.2%, and the ZnO is 2.1%. Then the first material and the waste graphite electrode are mixed according to 100:30, and the mixture is balling, the ball size is 12-16mm, to obtain the carbon-containing ball, and the ball is dried to less than 5% moisture; the dried ball is reduced in a reduction furnace, the reduction temperature is 1200°C, and the reduction time is 30 minutes, the zinc, lead, potassium and sodium compounds in the electric furnace dust are volatilized into the gas phase by reduction, the secondary dust is collected by bag dust collection, the metallization rate of the de-zinc ball is 69%, and the zinc removal rate is 87%. After one-stage magnetic separation, the metallic iron powder with an iron grade of 70% is obtained. The TFe in the tailings is 17.5%, the MFe content is 3.6%, and the tailings can be mixed with fly ash, desulfurization gypsum, bentonite and other siliceous and calcareous materials to produce solid waste cementing materials.

[0066] From the above Examples 1-6 and Comparative Example 1, it can be seen that by using the method of the present application, the electric furnace oxidized slag and the electric furnace dust are simultaneously reduced and magnetically separated, and Fe, Zn and other components are comprehensively recovered, which effectively reduces the TFe content in the electric furnace oxidized slag, and cooperatively processes the electric furnace smelting solid waste such as the electric furnace dust and the waste graphite electrode. The comparative example does not use the process parameters of the present application, and the recovery of Fe, Zn and other components is poor.

[0067] The above description is merely a specific implementation of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for electric furnace smelting solid waste co-processing, characterized in that, The method comprises: The electric furnace oxidized slag is pretreated to obtain electric furnace oxidized slag micro powder; wherein the electric furnace oxidized slag micro powder has a target specific surface area of 200-600 m 2 / kg. The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises: The method comprises:

2. The method of claim 1, wherein, The target specific surface area is 400-600 m 2 / kg.

3. The method of claim 1, wherein, The method comprises:

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