CN114763582A - Method for producing magnesium pellets by using oriented silicon steel magnesium oxide waste - Google Patents
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Abstract
The invention discloses a method for producing magnesium pellets by using oriented silicon steel magnesium oxide waste, which adopts magnesium oxide waste such as waste magnesium oxide sludge, waste magnesium oxide powder and the like in the production process of oriented silicon steel, coarse-grained iron ore powder, mirror hematite, magnetite concentrate, bentonite and limestone powder as raw materials, and then the raw materials are subjected to pretreatment, batching and pelletizing in sequence, and then are subjected to drying preheating, roasting and cooling on a chain grate machine, a rotary kiln and a circular cooler to obtain the magnesium pellets. The method utilizes the magnesium oxide waste to prepare the magnesium pellets, is beneficial to reducing the environmental protection pressure brought by the magnesium oxide waste and the disposal cost generated during outward transportation, can also obviously reduce the manufacturing cost of the magnesium pellets, comprehensively utilizes the existing resources of a steel plant, produces the environment-friendly and low-cost magnesium pellets, provides high-quality raw materials for a blast furnace, finally reduces the pollutant emission in the iron-making process, and reduces the environmental pollution.
Description
Technical Field
The invention belongs to the field of metallurgy, waste recycling and raw material pretreatment, relates to a solid waste recycling technology, and more particularly relates to a method for producing magnesium pellets by using oriented silicon steel magnesium oxide waste.
Background
With the accelerated development of the Chinese industrialization process, the demand on silicon steel is increasing day by day, and the Chinese steel industry realizes the rapid development of the silicon steel industry through introduction, digestion and independent innovation, and the annual growth rate reaches 10.5%. According to statistics, the total yield of the current Chinese silicon steel can reach 1236 ten thousand tons, wherein the yield of the oriented silicon steel reaches 134 ten thousand tons, and the amount of wastes generated in the production process is increased increasingly along with the increase of the yield. In the production process of oriented silicon steel, in order to prevent the silicon steel from bonding during high-temperature annealing and promote desulfurization and denitrification reactions, magnesium oxide is used as an isolating agent, so that a uniform magnesium silicate glass film, namely a magnesium silicate bottom layer, is formed on the surface of the silicon steel. In actual production, magnesium oxide is usually coated on the surface of strip steel in a solution with a certain thickness before high-temperature annealing, after the annealing is finished, a magnesium silicate bottom layer is formed on the surface of silicon steel, a part of magnesium oxide is remained, after a steel coil is uncoiled, a part of magnesium oxide becomes waste after being collected by a dust removal system in a solid dust form, and part of magnesium oxide is mixed with liquid and is discarded in a sludge manner; the activity of the part of magnesia powder is changed after high-temperature sintering, and meanwhile, the dust and mud are mixed with part of the transferred component elements in the silicon steel, so that the requirements of continuous use can not be met from the aspects of components, activity and the like, and the part of magnesia powder can only be discarded. If the annual output of the oriented silicon steel is 30 ten thousand tons, about 2000 tons of magnesium oxide dust and mud (dry basis) are generated, and the magnesium oxide dust and mud have the characteristics of high magnesium oxide content, fine granularity and complex components, are used as wastes, increase the environmental pressure and cause great waste of resources.
Chinese patent CN105985533B discloses a method for manufacturing an ultrahigh molecular plastic additive by using oriented silicon steel magnesium oxide waste, which comprises the steps of taking magnesium oxide waste as a raw material, carrying out high-temperature calcination (550-850 ℃ and 2-8 h) for decarburization to obtain activated waste, carrying out ball milling coating, and then carrying out screening to obtain the ultrahigh molecular plastic additive.
Chinese patent CN104099469B discloses a method for utilizing waste magnesia powder after heat treatment of oriented silicon steel, which is mainly used for uniformly mixing magnesia waste, carbon powder and asphalt according to a certain weight ratio and producing magnesia carbon balls for converter slag splashing and furnace protection, so that the waste magnesia powder is effectively utilized.
Chinese patent CN101906533B discloses a low-silicon magnesium-containing pellet and a production method thereof, wherein low-silicon magnet fine powder, a magnesium-containing additive and a binder are mixed according to a certain proportion, mixed uniformly, added with proper moisture, pelletized, and then dried, preheated and roasted on a belt roasting machine to obtain the magnesium-containing pellet; the magnesium-containing additive can be selected from magnesia powder, light-burned dolomite, olivine and boric sludge; the binder can be bentonite or composite binder.
Chinese patent CN101550484A discloses an acidic magnesium oxide pellet and a preparation method thereof, magnetite powder, bentonite and magnesite powder with the grain diameter of-200 meshes larger than 90 percent are mixed, water is added for pelletizing and drying; preheating and roasting to obtain the magnesium-containing pellets with the reduction expansion rate reduced by 50%.
Chinese patent CN105039681B discloses a method for manufacturing alkaline high-magnesium pellets, which comprises mixing iron ore concentrate powder with magnesia-calcium brick powder, bentonite and coal powder according to a certain proportion, adding water to pelletize, drying, preheating and roasting to obtain alkaline high-magnesium pellets with quaternary alkalinity of 1.15 and MgO content of more than or equal to 3.8%. The calcium-magnesium brick powder is formed by crushing and finely grinding waste calcium-magnesium bricks.
Chinese patent CN107130070B discloses a calcium-magnesium-containing pellet and a preparation method thereof, wherein magnesium is weakly containedPreparing magnetic concentrate, magnetite concentrate, light-burned dolomite fly ash and bentonite according to a certain proportion, adding water for pelletizing, drying, preheating and roasting to obtain calcium-magnesium-containing pellets; can solve the environmental protection problem caused by piling up the fly ash of the light-burned dolomite, and simultaneously reduces the addition amount of the bentonite after adding because the fly ash has fine granularity and large specific surface area, thereby reducing the SiO in the pellets2The content of (a).
Chinese patent CN104263917B discloses a raw material for producing magnesium pellets by a belt machine and a method for producing the magnesium pellets, wherein the raw material containing iron, serpentine and bentonite are fully mixed according to a certain proportion, water is added for pelletizing, and the magnesium oxide pellets are obtained after the blast drying and the air draft drying of the belt machine, preheating, roasting and cooling.
Chinese patent CN102102147B introduces a process for producing magnesium pellets by a grate rotary kiln, which comprises the steps of mixing magnetite concentrate, bentonite and magnesite according to a certain proportion, adding water to make pellets, feeding green pellets into the grate for drying and preheating, feeding the preheated pellets into the rotary kiln for roasting, and cooling to obtain magnesium pellets.
In addition, numerous researchers have disclosed the characteristics of magnesium-containing pellets or metallurgical properties, such as "experimental study of low-basicity magnesium oxide pellets" (fang xiao hui, gan min, etc., steel, 2009, V44(3)), "industrial practice application of large metallurgical iron ore to magnesium self-fluxing pellets" (white stars, yochun swallow, etc., modern mining, 2019, (6)), "experimental study of shot marbled ore with light-burned magnesium oxide powder" (de bo, jie ru, etc., anhui metallurgy, 2011, (2)), "industrial experimental study of magnesium pellets with ludwigite" (huanggui, screening, etc., sintered pellets, 2016, V41(6)), "preliminary experimental study of pellets with magnesium binder" (schigming, shanxi metallurgy, 2011), (2)), "experimental study and practice of magnesium pellets with steel (building peak, liu protection, the research and production practice of magnesite, magnesia sand, light-burned magnesia powder, magnesian bentonite, magnesium-containing iron ore concentrate and the like for preparing magnesium-containing pellets are respectively introduced into Shandong metallurgy, 2011, V33(1)), alkalinity and influence of internal fuel on the strength of hematite pellets (Zhudeqing, Shenwenjun and the like, 2011, (6)), "first Steel Jingtang high magnesium pellet industrial test" (Liuwenwang, Li Ming and the like, sintered pellets, 2012 and V37 (5)).
Therefore, the patents and published documents related to the domestic magnesium-containing pellets basically use magnetite as a raw material, namely magnesia powder (dead-burned magnesite), light-burned dolomite and dolomite (MgCO)3+CaCO3) Magnesite (MgCO)3) The olivine, the calcium-magnesium brick powder and the like are used as magnesium-containing flux, a belt type machine or a chain grate-rotary kiln is used as production equipment, and the magnesium-containing pellets are obtained through the technical processes of green pellet preparation, drying, preheating, roasting, cooling and the like. Dolomite and magnesite are generally used in the traditional preparation process of magnesium-containing pellets, although the cost is low, the strength of the preheated pellets and finished products in the process is reduced, and CO is caused when the magnesium-containing pellets are used2The emission is increased and the energy consumption is increased due to the decomposition and heat absorption of carbonate; if the light-burned magnesium powder (MgO is more than or equal to 85 percent) is used, compared with the traditional magnesium-containing pellets, although the strength of the preheated pellets and the finished product is increased, the cost of the light-burned magnesium powder is higher, the price of the light-burned magnesium powder is usually as high as 1200-1500 yuan/t, and 23.5kg of the light-burned magnesium powder needs to be added into each ton of pellets by calculating the content of MgO in the magnesium-containing pellets to be 2 percent, and the cost is 28-35 yuan. The applications of the silicon steel magnesia waste disclosed in the above-mentioned related documents include the production of polymer plastic additives, the production of magnesium carbon spheres, etc. And the application of the oriented silicon steel magnesium oxide waste as a magnesium-containing pellet additive is not reported so far.
Therefore, if the oriented silicon steel magnesium oxide waste can be used for producing magnesium-containing pellets, the magnesium oxide waste can be comprehensively utilized, the cost of magnesium flux in the magnesium-containing pellets can be obviously reduced, the produced magnesium pellets can be used for blast furnace production in a high proportion, the pollutant emission in the iron-making process is reduced, and the oriented silicon steel magnesium oxide waste has important application value.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for producing magnesium pellets by utilizing oriented silicon steel magnesium oxide waste, wherein the magnesium pellets are prepared by adopting the magnesium oxide waste, so that the reduction of the magnesium oxide waste is facilitatedThe environmental protection pressure brought by the materials and the disposal cost generated when the magnesia waste is transported outside are saved, and simultaneously, the manufacturing cost of the magnesium pellet can be obviously reduced, in addition, the problem that the magnesium pellet prepared by adopting dolomite and magnesite causes CO in the iron making process is solved2The emission is increased, and the energy consumption is increased due to the heat absorption of the decomposition of the carbonate; in the method for producing the magnesium pellets by utilizing the oriented silicon steel magnesium oxide waste, the existing resources of a steel plant are comprehensively utilized, so that the environment-friendly and low-cost magnesium pellets are produced, high-quality raw materials are provided for a blast furnace, the pollutant emission in the iron-making process is finally reduced, and the environment pollution is reduced.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for producing magnesium pellets by utilizing oriented silicon steel magnesium oxide waste comprises the following raw materials in percentage by weight on a dry basis:
coarse-grained iron ore powder: 32-42%;
mirror image hematite: 42-52%;
and (3) magnetite concentrate: 9-16%;
waste magnesium oxide sludge: 0.5-1.5%;
waste magnesium oxide powder: 1-3%;
bentonite: 0.7-1.5%;
limestone powder: 2-6%.
Preferably, the method comprises the steps of:
s1, preprocessing, namely adding the waste magnesium oxide sludge into coarse-grained iron ore powder subjected to ball milling and mirror hematite to form ore pulp, filtering and dehydrating, and performing high-pressure roller milling surface modification on the ore pulp and the magnetite concentrate to obtain bulk concentrate;
s2, blending, namely uniformly mixing the bulk concentrate obtained in the step S1 with the waste magnesium oxide powder, the limestone powder and the bentonite to obtain a mixed material;
s3, pelletizing, namely adding water into the mixture prepared in the step S2 for pelletizing, and screening to obtain qualified green pellets;
s4, drying and roasting: and (5) drying, preheating, roasting and cooling the qualified green pellets in the step S3 on a chain grate machine, a rotary kiln and a circular cooler to obtain the magnesium pellets.
Preferably, the coarse-grained iron ore powder is iron ore powder for sintering, and the granularity is 0-8 mm;
the particle size of the mirror image hematite is 0-1 mm;
the granularity of the magnetite concentrate is-0.074 mm and accounts for more than 80 percent;
the water content of the waste magnesium oxide sludge is 40-60 wt%, and the MgO content in the dry basis of the waste magnesium oxide sludge is more than or equal to 60 wt%;
the waste magnesia powder has a granularity less than 0.074mm accounting for more than 90 percent, and the MgO content is more than or equal to 90 percent by weight;
the bentonite is used for pelletizing;
the limestone powder has a particle size of less than 0.074mm and a specific surface area of not less than 3500cm2The CaO content is more than or equal to 50wt percent.
Preferably, in the step S1, before the pretreatment, water is added to the waste magnesia sludge and diluted to a water content of 80-90 wt%.
Preferably, in the step S1, the water content of the bulk concentrate is 6-8 wt%, and the specific surface area is not less than 1800cm2/g。
Preferably, in the step S2, the water content of the mixed material is 6-8 wt%.
Preferably, in the step S3, the qualified green pellets have a water content of 8-10 wt% and a particle size of 8-18 mm.
Preferably, in the step S4, the qualified green pellets are subjected to blast drying, draft drying and preheating in sequence by a chain grate machine to obtain preheated pellets; and during preheating, the preheating temperature is 1030-1070 ℃, and the preheating time is 9-11 min.
Preferably, the compression strength of the preheated pellets is 380-410N/pellet (the compression strength of one pellet is 380-410N).
Preferably, the preheated pellets are roasted in a rotary kiln at 1250-1270 ℃ for 25-30 min to obtain roasted pellets.
Preferably, the roasted pellets are cooled by a circular cooler to obtain magnesium pellets with the temperature lower than 150 ℃.
Preferably, the MgO content of the magnesium pellet is 1.0-3.0 wt%, the compressive strength is more than or equal to 2500N/pellet, and the reduction expansion rate is less than or equal to 25%.
The method for producing the magnesium pellets by using the oriented silicon steel magnesium oxide waste also has the following beneficial effects:
1) the method for producing the magnesium pellets by using the oriented silicon steel magnesium oxide waste can recycle waste such as magnesium oxide sludge, magnesium oxide powder and the like in the silicon steel production flow, and prepare the magnesium-containing pellets which can be used by a blast furnace in a mode of not generating secondary pollution, thereby realizing the efficient utilization of solid waste resources, reducing the environmental pollution, having reasonable use route and large using amount, being capable of consuming waste such as magnesium oxide sludge, magnesium oxide powder and the like in a factory in full amount, efficiently utilizing the solid waste and being beneficial to protecting the environment;
2) The method for producing the magnesium pellets by using the oriented silicon steel magnesia waste has the advantages that the waste magnesia sludge and the waste magnesia powder used as raw materials have high MgO content and basically do not contain carbonate, and the traditional method for producing the magnesium pellets by using the magnesium-containing pellets avoids using dolomite (MgCO)3+CaCO3) Magnesite (MgCO)3) CO produced during the adjustment of MgO2The emission is increased, and the energy consumption is increased due to the heat absorption of the decomposition of the carbonate, so that the energy conservation, emission reduction, cleanness and low carbon of the magnesium-containing pellet production process are facilitated;
3) the method is characterized in that hematite is used as a main raw material, magnesium pellets in the prior art are produced by mostly using dolomite and magnesite, although the price is low, the compressive strength of preheated pellets (the compressive strength of the preheated pellets is 300-500N/per pellet, and the standard preheated pellets are 380-580N/per pellet) and the finished product strength (the compressive strength of finished pellets is 2400-2700N/per pellet, and the standard finished product pellets are 2500-3000N/pellet) are reduced, the strength of the preheated pellets and the finished product pellets is basically unchanged by using light-burned magnesium powder (MgO is more than or equal to 85%), but the price of the light-burned magnesium powder is usually as high as 1200-1500 pellets/t, calculated by the content of MgO of the pellets being 2%, 23.5kg of the light-burned magnesium powder needs to be added per ton, and the cost is 28-35 yuan; the waste magnesium oxide dust and mud is used as solid waste, the disposal cost is still provided by conventional outward transportation, if the waste magnesium oxide dust and mud can be absorbed in a factory, the disposal cost can be saved, expensive light-burned magnesium powder can be replaced, and the production cost of magnesium-containing pellets can be reduced;
4) With the rapid development of industries such as the electric power industry, household appliances, new energy automobiles and the like, the demand of oriented silicon steel is increased, and the generation amount of waste magnesium oxide dust and mud is synchronously increased; meanwhile, with the improvement of the requirement of blast furnace smelting technology, the demand of magnesium-containing pellets is increased day by day, the method for producing magnesium-containing pellets by utilizing oriented silicon steel magnesium oxide waste can organically combine the magnesium-containing pellets and the blast furnace smelting technology, is favorable for reducing the environmental protection pressure brought by waste magnesium oxide dust and mud, can also effectively reduce the manufacturing cost of the magnesium-containing pellets, and has environmental protection benefit, economic benefit and social benefit and better popularization and application prospect.
Drawings
FIG. 1 is a schematic flow chart of the method for producing magnesium pellets by using oriented silicon steel magnesium oxide waste according to the present invention.
Detailed Description
In order to better understand the technical solutions of the present invention, the following further describes the technical solutions of the present invention with reference to the accompanying drawings and examples.
As shown in fig. 1, the raw materials for producing magnesium pellets by using the oriented silicon steel magnesium oxide waste provided by the invention comprise the following components in percentage by weight on a dry basis:
coarse-grained iron ore powder: 32-42%;
Mirror image hematite: 42-52%;
and (3) magnetite concentrate: 9-16%;
waste magnesium oxide sludge: 0.5-1.5%;
waste magnesium oxide powder: 1-3%;
and (3) bentonite: 0.7-1.5%;
limestone powder: 1.8-6%.
Wherein the coarse-grained iron ore powder is iron ore powder for sintering, has the granularity of 0-8 mm and does not contain a lower limit; the granularity of the mirror hematite is 0-1 mm, and the lower limit is not included; the particle size of the magnetite concentrate is-0.074 mmAccounts for more than 80 percent; the water content of the waste magnesia sludge is 40-60 wt%, and the MgO content in dry basis is more than or equal to 60 wt%; the waste magnesia powder has a granularity less than 0.074mm accounting for more than 90 percent, and the MgO content is more than or equal to 90 percent by weight; the bentonite is used for pelletizing; the limestone powder is prepared by grinding conventional limestone, has a particle size of less than 0.074mm and a specific surface area of more than or equal to 3500cm2The CaO content is more than or equal to 50wt percent.
The raw materials are sequentially pretreated, proportioned and pelletized, and then are dried, preheated, roasted and cooled on a chain grate machine, a rotary kiln and a circular cooler to obtain the magnesium pellets. The method for producing the magnesium pellets by utilizing the oriented silicon steel magnesium oxide waste specifically comprises the following steps:
s1, preprocessing, namely adding waste magnesium oxide sludge into coarse-grained iron ore powder subjected to ball milling and mirror hematite to form ore pulp, filtering and dehydrating, and performing surface modification on the ore pulp and magnetite concentrate by a high-pressure roller mill to obtain mixed concentrate;
The specific process is as follows: after the raw material components are mixed according to the ratio, adding water into the waste magnesium oxide sludge to dilute the waste magnesium oxide sludge until the water content is 80-90 wt%, and taking the waste magnesium oxide sludge as slurry for later use; then carrying out ball milling treatment on coarse-grained iron ore powder and mirror-image hematite respectively, adding slurry diluted by waste magnesium oxide sludge into the coarse-grained iron ore powder and mirror-image hematite after ball milling treatment to form ore pulp, filtering and dehydrating the ore pulp, and carrying out surface modification on the ore pulp and the magnetite concentrate by a high-pressure roller mill to obtain the product with the water content of 6-8 wt% and the specific surface area of more than or equal to 1800cm2(ii)/g (where specific surface area is Boehringer's specific surface area) of bulk concentrate; in a further preferable scheme, the specific surface area of the bulk concentrate is 1800-2000 cm2/g。
In the process, the waste magnesium oxide sludge is prepared into slurry with the water content of 80-90 wt% by adding water, and the slurry and iron ore (coarse iron ore powder and mirror hematite) subjected to ball milling treatment enter a filter together, so that the high energy consumption links such as drying, granulating and the like of the waste magnesium oxide sludge in the traditional utilization mode are avoided, and the waste magnesium oxide sludge and the iron ore (coarse iron ore powder and mirror hematite) subjected to ball milling treatment can be uniformly mixed and dispersed in the form of slurry, and the mixed iron ore containing magnesium oxide and with the water content of 6-8 wt% is obtained after filtering; the magnesium oxide-containing compound After the mixed iron ore is mixed with the ball-milling-free magnetite concentrate with the granularity meeting the requirement, the surface modification is carried out through a high-pressure roller mill to prepare the mixed concentrate, and the specific surface area of the mixed concentrate is not less than 1800cm through the surface modification2And/g, ensuring that the green pellets fall and the compressive strength meets the production requirements after pelletizing.
S2, blending, namely uniformly mixing the bulk concentrate obtained in the step S1 with waste magnesium oxide powder, limestone powder and bentonite to obtain a mixed material;
the specific process is as follows: adding waste magnesium oxide powder, limestone powder and bentonite into the bulk concentrate prepared in the step S1, so that the alkalinity and MgO content of the subsequently prepared magnesium pellets meet the requirements of a blast furnace, and fully and uniformly mixing the magnesium pellets by a powerful mixer to obtain a mixed material with the water content of 6-8 wt%; wherein, the intensive mixer is adopted for mixing, which aims to ensure that a small amount of dry powder raw material components with high specific surface area, such as waste magnesium oxide powder, limestone powder and bentonite, are uniformly dispersed into the bulk concentrate, thereby ensuring the stability in the subsequent pelletizing process and the uniformity of magnesium pellets.
The waste magnesia powder in the process mainly plays the following roles: (1) the superfine waste magnesium oxide powder has large specific surface area, and plays a role in improving green pellet strength during subsequent pelletizing; (2) the waste magnesia powder has higher MgO content, can provide MgO required by the magnesium pellets, and improves the reduction expansion rate of the magnesium pellets. The limestone powder plays a role in mainly regulating the alkalinity of the pellets, forming a calcium ferrite phase in the pellets and improving the ore pressure strength of the pellets. The bentonite is conventional bentonite for pellets, and mainly has the effects of improving green pellet performance, particularly improving green pellet falling strength and reducing green pellet breakage in the process of transportation.
S3, pelletizing, namely adding water into the mixture prepared in the step S2 for pelletizing, and screening to obtain qualified green pellets;
the specific process is as follows: adding a small amount of water into the mixed material prepared in the step S2 for pelletizing to prepare green pellets, and screening the green pellets with the particle size of 8-18 mm to obtain qualified green pellets; in a further preferable scheme, the green pellets with the particle size of 8-16 mm are qualified green pellets. The water content added in the process is 8-10 wt% of the weight of the mixed material, and the purpose is to enable the material with high specific surface to gradually grow up in the rolling process of a pelletizer under the action of moisture, so that fine materials are aggregated into balls to reach a certain granularity.
S4, drying and roasting: and (5) drying, preheating, roasting and cooling the qualified green pellets in the step S3 on a chain grate machine, a rotary kiln and a circular cooler to obtain the magnesium pellets.
The specific process is as follows: sending the qualified green pellets screened in the step 3 into a chain grate machine, and sequentially performing air blast drying, air draft drying and preheating for 9-11 min at the temperature of 1030-1070 ℃ to obtain preheated pellets with the compressive strength of 380-410N/pellet; then roasting the preheated pellets in a rotary kiln at 1250-1270 ℃ for 25-30 min to obtain roasted pellets; and cooling the roasted pellets by a circular cooler to obtain the magnesium pellets with the temperature lower than 150 ℃. In the process, the solid-phase reaction temperature of the magnesium ferrite is higher than that of the calcium ferrite, so that the preheating and roasting temperature of the magnesium pellets is 20-40 ℃ higher than that of the conventional high hematite proportioning fluxed pellets, so as to ensure that the strength of finished pellets is more than or equal to 2500N/pellet.
The detection proves that the MgO content of the magnesium pellet is 1.0-3.0 wt%, the iron grade is more than or equal to 64 wt%, and the alkalinity (CaO/SiO)2) 0.3-0.8, the compressive strength is more than or equal to 2500N/piece, and the reduction expansion rate is less than or equal to 21%; wherein the reduction expansion rate is detected by a GB/T13240-2018 method.
The method for producing magnesium pellets by using oriented silicon steel magnesium oxide waste of the present invention is further described below with reference to specific examples, wherein the following raw material components in the following examples 1 to 4 are as follows: the coarse-grained iron ore powder is iron ore powder for sintering, and the granularity is 0-8 mm; the granularity of mirror image hematite is 0-1 mm; the granularity of the magnetite concentrate is-0.074 mm and accounts for more than 80 percent; the water content of the waste magnesia sludge is 40-60 wt%, and the MgO content in dry basis is more than or equal to 60 wt%; the waste magnesia powder has a granularity of less than 0.074mm accounting for more than 90 percent, and the MgO content is more than or equal to 90 percent by weight; the bentonite is used for pelletizing; limestone powder is prepared by grinding conventional limestone, has a particle size of less than 0.074mm and a specific surface area of more than 3500cm2The CaO content is more than or equal to 50wt percent per gram.
Reference example (without addition of magnesium oxide waste):
the raw materials for producing the reference pellets in the reference example comprise the following components in percentage by weight on a dry basis:
Coarse iron ore powder: 35 percent;
mirror image hematite: 44%;
and (3) magnetite concentrate: 15 percent;
bentonite: 1.0 percent;
limestone powder: 5 percent.
In the method for producing the reference pellet in the reference example, the raw material components are firstly proportioned, and the method specifically comprises the following steps:
(1) pretreatment: performing ball milling treatment on coarse-grained iron ore powder and mirror-image hematite respectively, filtering and dehydrating the coarse-grained iron ore powder and mirror-image hematite together, and performing surface modification on the coarse-grained iron ore powder and the mirror-image hematite together through a high-pressure roller mill to obtain the hematite with the water content of 6-8 wt% and the specific surface area of more than or equal to 1800cm2(iv) bulk concentrate;
(2) preparing materials: adding limestone powder and bentonite into the bulk concentrate prepared in the step (1), and fully and uniformly mixing the mixture by a powerful mixer to obtain a mixed material with the water content of 6-8 wt%;
(3) pelletizing: adding a small amount of water (the water content is 8-10 wt% of the weight of the mixed material) into the mixed material prepared in the step (2) for pelletizing to prepare green pellets, and screening out the green pellets with the grain size of 8-16 mm to serve as qualified green pellets.
(4) Drying and roasting: sending the qualified green pellets screened in the step 3 into a chain grate machine, and sequentially performing air blast drying, air draft drying and preheating for 11min at the temperature of 1030 ℃ to obtain preheated pellets with the compressive strength of 410N/pellet; then roasting the preheated pellets in a rotary kiln for 28min at 1230 ℃ to obtain roasted pellets; cooling the roasted pellets by a circular cooler to obtain reference pellets with the temperature lower than 150 ℃;
The chemical compositions of the reference pellet prepared as described above were determined as shown in the reference example in table 1, wherein the reference pellet had an MgO content of 0.2 wt%, an iron grade of 65.0 wt%, and an alkalinity (CaO/SiO) of2) Is 0.8; and the indexes of the reference pellets are detected, the compression strength is 3020N/pellet, and the reduction expansion rate is 23%.
Example 1
The raw materials for producing the magnesium pellets in the embodiment comprise the following components in percentage by weight on a dry basis:
coarse-grained iron ore powder: 36.7 percent;
mirror image hematite: 44%;
and (3) magnetite concentrate: 15 percent;
waste magnesium oxide sludge: 0.5 percent;
waste magnesium oxide powder: 1.0 percent;
bentonite: 1.0 percent;
limestone powder: 1.8 percent.
In the method for producing magnesium pellets by using oriented silicon steel magnesium oxide waste in the embodiment, the raw material components are proportioned, and the method specifically comprises the following steps:
(1) pretreatment: adding water into the waste magnesium oxide sludge to dilute the waste magnesium oxide sludge until the water content is 80-90 wt%, and taking the waste magnesium oxide sludge as slurry for later use; then, performing ball milling treatment on coarse iron ore powder and mirror image hematite respectively, adding slurry diluted by waste magnesium oxide sludge into the coarse iron ore powder and mirror image hematite after ball milling treatment to form ore pulp, filtering and dehydrating the ore pulp, and performing surface modification on the ore pulp and magnetite concentrate by using a high-pressure roller mill to obtain the product with the water content of 6-8 wt% and the specific surface area of more than or equal to 1800cm 2(iv) bulk concentrate;
(2) preparing materials: adding waste magnesium oxide powder, limestone powder and bentonite into the bulk concentrate prepared in the step (1), and fully and uniformly mixing the mixture by using a powerful mixer to obtain a mixed material with the water content of 6-8 wt%;
(3) pelletizing: adding a small amount of water (the water content is 8-10 wt% of the weight of the mixed material) into the mixed material prepared in the step (2) for pelletizing to prepare green pellets, and screening out the green pellets with the grain size of 8-16 mm to serve as qualified green pellets.
(4) Drying and roasting: sending the qualified green pellets screened in the step 3 into a chain grate machine, and sequentially carrying out air blast drying, air draft drying and preheating at 1050 ℃ for 11min to obtain preheated pellets with the compressive strength of 380N/pellet; then the preheated pellets are roasted for 28min at 1250 ℃ in a rotary kiln to obtain roasted pellets; cooling the roasted pellets by a circular cooler to obtain magnesium pellets with the temperature lower than 150 ℃;
the chemical composition of the magnesium pellet prepared as described above is shown in example 1 in table 1, wherein the magnesium pellet has a MgO content of 1.2 wt%, an iron grade of 64.9 wt%, and a basicity (CaO/SiO) of 12) Is 0.3; and the metallurgical index of the magnesium pellet is detected, the compressive strength is 2950N/pellet, and the reduction expansion rate is 21%.
Example 2
The raw material components for producing the magnesium pellets in the example are as follows:
coarse-grained iron ore powder: 44.4 percent;
mirror image hematite: 42%;
magnetite concentrate: 9 percent;
waste magnesium oxide sludge: 0.8 percent;
waste magnesium oxide powder: 1.0 percent;
bentonite: 1.0 percent;
limestone powder: 1.8 percent.
In the method for producing magnesium pellets by using oriented silicon steel magnesium oxide waste in the embodiment, the raw material components are proportioned, and the method specifically comprises the following steps:
(1) pretreatment: adding water into the waste magnesium oxide sludge to dilute the waste magnesium oxide sludge until the water content is 80-90 wt%, and taking the waste magnesium oxide sludge as slurry for later use; then performing ball milling treatment on the coarse-grained iron ore powder and the mirror-image hematite respectively, adding the coarse-grained iron ore powder and the mirror-image hematite after the ball milling treatment to form ore pulp, filtering and dehydrating the ore pulp together, and performing surface modification on the ore pulp and the magnetite concentrate together through a high-pressure roller mill to obtain the high-pressure roller mill with the water content of 6-8 wt%, the specific surface area of more than or equal to 1800cm2(iv) bulk concentrate;
(2) preparing materials: adding waste magnesium oxide powder, limestone powder and bentonite into the bulk concentrate prepared in the step (1), and fully and uniformly mixing the mixture by using a powerful mixer to obtain a mixed material with the water content of 6-8 wt%;
(3) pelletizing: adding a small amount of water (the water content is 8-10 wt% of the weight of the mixed material) into the mixed material prepared in the step (2) for pelletizing to prepare green pellets, and screening out the green pellets with the grain size of 8-16 mm to serve as qualified green pellets.
(4) Drying and roasting: sending the qualified green pellets screened in the step 3 into a chain grate machine, and sequentially carrying out air blast drying, air draft drying and preheating at 1060 ℃ for 11min to obtain preheated pellets with the compressive strength of 390N/pellet; then the preheated pellets are roasted for 30min at 1260 ℃ in a rotary kiln to obtain roasted pellets; cooling the roasted pellets by a circular cooler to obtain magnesium pellets with the temperature lower than 150 ℃;
the chemical composition of the magnesium pellet prepared as described above was determined as shown in example 2 in table 1, wherein the magnesium pellet had an MgO content of 1.5 wt%, an iron grade of 64.8 wt%, and a basicity (CaO/SiO) of the magnesium pellet2) Is 0.3; then, the metallurgical indexes of the magnesium pellets are detected, the compressive strength is 2900N/pellet, and the reduction expansion rate is 19%.
Example 3
The raw materials for producing the magnesium pellets in the embodiment comprise the following components in percentage by weight on a dry basis:
coarse iron ore powder: 41.1%;
mirror image hematite: 42%;
and (3) magnetite concentrate: 11 percent;
waste magnesium oxide sludge: 1.0 percent;
waste magnesium oxide powder: 2.2 percent;
and (3) bentonite: 0.9 percent;
limestone powder: 1.8 percent.
In the method for producing magnesium pellets by using oriented silicon steel magnesium oxide waste in the embodiment, the raw material components are proportioned, and the method specifically comprises the following steps:
(1) Pretreatment: adding water into the waste magnesium oxide sludge to dilute the waste magnesium oxide sludge until the water content is 80-90 wt%, and taking the waste magnesium oxide sludge as slurry for later use; then, performing ball milling treatment on the coarse-grained iron ore powder and the mirror-image hematite respectively, adding the processed coarse-grained iron ore powder and the mirror-image hematite to form ore pulp, filtering and dehydrating the ore pulp together, and performing surface modification on the ore pulp and the magnetite concentrate together through a high-pressure roller mill to obtain the iron-based mirror-image hematite with the water content of 6-8 wt%, the specific surface area of more than or equal to 1800cm and the water content of 6-8 wt%2(iv) bulk concentrate;
(2) preparing materials: adding waste magnesium oxide powder, limestone powder and bentonite into the bulk concentrate prepared in the step (1), and fully and uniformly mixing the mixture by using a powerful mixer to obtain a mixed material with the water content of 6-8 wt%;
(3) pelletizing: adding a small amount of water (the water content is 8-10 wt% of the weight of the mixed material) into the mixed material prepared in the step (2) for pelletizing to prepare green pellets, and screening out the green pellets with the grain size of 8-16 mm to serve as qualified green pellets.
(4) Drying and roasting: sending the qualified green pellets screened in the step 3 into a chain grate machine, and sequentially carrying out air blast drying, air draft drying and preheating for 11min at the temperature of 1070 ℃ to obtain preheated pellets with the compressive strength of 385N/pellet; then the preheated pellets are roasted for 30min at 1270 ℃ in a rotary kiln to obtain roasted pellets; cooling the roasted pellets by a circular cooler to obtain magnesium pellets with the temperature lower than 150 ℃;
The chemical composition of the magnesium pellet prepared as described above was determined as shown in example 3 of table 1, wherein the magnesium pellet had an MgO content of 2.5 wt%, an iron grade of 64.6 wt%, and a basicity (CaO/SiO) of the magnesium pellet2) Is 0.3; and then the indexes of the magnesium pellets are detected, the compressive strength is 2820N/pellet, and the reduction expansion rate is 16%.
Table 1 composition (wt%) of the reference pellets prepared in the reference example and the magnesium pellets prepared in examples 1 to 3
| TFe | SiO2 | CaO | MgO | Al2O3 | Alkalinity (CaO/SiO)2) | |
| Reference example | 65.0 | 2.95 | 2.36 | 0.2 | 0.82 | 0.8 |
| Example 1 | 64.9 | 2.90 | 0.87 | 1.2 | 0.86 | 0.3 |
| Example 2 | 64.8 | 2.93 | 0.88 | 1.5 | 0.84 | 0.3 |
| Example 3 | 64.6 | 2.91 | 0.88 | 2.5 | 0.89 | 0.3 |
It is understood from the reference examples, examples 1 to 3 and table 1 that the MgO content of the reference pellets in the reference examples is low, only 0.2 wt%, and does not play a role in suppressing the reduction expansion rate of the pellets, and therefore the reduction expansion rate of the pellets in the reference examples is higher than that of the magnesium pellets in examples 1 to 3, and therefore, the use of the reference pellets in the reference examples at a high ratio (> 15%) adversely affects the blast furnace permeability, the differential pressure and the production stability.
In conclusion, the MgO content of the magnesium pellet is 1.0-3.0 wt%, the iron grade is not less than 64 wt%, and the SiO content of the magnesium pellet is2Content is less than or equal to 3 wt%, Al2O3The content is less than or equal to 1.0 wt%, the compressive strength is 2800-3000N/piece, and the reduction expansion rate is 16-21%; compared with the magnesium pellets prepared by adopting dolomite and magnesite in the prior art (generally, the compressive strength is 2400-2700N/pellet, and the reduction expansion rate is 20-24%), the magnesium pellets prepared in the invention do not contain carbonate, so that CO can not be discharged in the subsequent use process in the iron making process 2And the energy consumption in the iron making process is increased due to the decomposition and heat absorption of carbonate.
It should be understood by those skilled in the art that the above embodiments are only for illustrating the present invention and are not to be used as a limitation of the present invention, and that changes and modifications to the above described embodiments are within the scope of the claims of the present invention as long as they are within the spirit and scope of the present invention.
Claims (10)
1. A method for producing magnesium pellets by utilizing oriented silicon steel magnesium oxide waste is characterized in that raw materials for producing the magnesium pellets comprise the following components in dry weight percentage:
coarse-grained iron ore powder: 32-42%;
mirror image hematite: 42-52%;
and (3) magnetite concentrate: 9-16%;
waste magnesium oxide sludge: 0.5-1.5%;
waste magnesium oxide powder: 1-3%;
and (3) bentonite: 0.7-1.5%;
limestone powder: 1.8 to 6 percent of the total weight of the alloy,
the method comprises the following steps:
s1, preprocessing, namely adding the waste magnesium oxide sludge into coarse-grained iron ore powder subjected to ball milling and mirror hematite to form ore pulp, filtering and dehydrating, and performing high-pressure roller milling surface modification on the ore pulp and the magnetite concentrate to obtain bulk concentrate;
s2, blending, namely uniformly mixing the bulk concentrate obtained in the step S1 with the waste magnesium oxide powder, the limestone powder and the bentonite to obtain a mixed material;
S3, pelletizing, namely adding water into the mixture prepared in the step S2 for pelletizing, and screening to obtain qualified green pellets;
s4, drying and roasting: and (5) drying, preheating, roasting and cooling the qualified green pellets in the step S3 on a chain grate machine, a rotary kiln and a circular cooler to obtain the magnesium pellets.
2. The method for producing the magnesium pellets by using the oriented silicon steel magnesium oxide waste according to claim 1, wherein the coarse-grained iron ore powder is iron ore powder for sintering, and has a granularity of 0-8 mm; and/or
The granularity of the mirror image hematite is 0-1 mm; and/or
The granularity of the magnetite concentrate is-0.074 mm and accounts for more than 80 percent; and/or
The water content of the waste magnesium oxide sludge is 40-60 wt%, and the MgO content in the dry basis of the waste magnesium oxide sludge is more than or equal to 60 wt%; and/or
The waste magnesia powder has a granularity less than 0.074mm accounting for more than 90 percent, and the MgO content is more than or equal to 90 percent by weight; and/or
The bentonite is bentonite for pelletizing; and/or
The limestone powder has a particle size of less than 0.074mm and a specific surface area of not less than 3500cm2The CaO content is more than or equal to 50wt percent.
3. The method for producing the magnesium pellets by using the oriented silicon steel magnesia waste as claimed in claim 1, wherein in the step S1, before the pretreatment, water is added to the waste magnesia sludge and diluted to a water content of 80-90 wt%.
4. The method for producing the magnesium pellets by using the oriented silicon steel magnesia waste as claimed in claim 1, wherein in the step S1, the water content of the bulk concentrate is 6-8 wt%, and the specific surface area is not less than 1800cm2(ii)/g; and/or
In the step S2, the water content of the mixed material is 6-8 wt%.
5. The method for producing the magnesium pellets by using the oriented silicon steel magnesium oxide waste as claimed in claim 1, wherein in the step S3, the qualified green pellets have a water content of 8-10 wt% and a particle size of 8-18 mm.
6. The method for producing the magnesium pellets by using the oriented silicon steel magnesium oxide waste as claimed in claim 1, wherein in the step S4, the qualified green pellets are subjected to blast drying, air draft drying and preheating in sequence on a chain grate machine to obtain preheated pellets; and during preheating, the preheating temperature is 1030-1070 ℃, and the preheating time is 9-11 min.
7. The method for producing the magnesium pellets by using the oriented silicon steel magnesium oxide waste as claimed in claim 6, wherein the compressive strength of the preheated pellets is 380-410N/pellet.
8. The method for producing the magnesian pellets by using the oriented silicon steel magnesium oxide waste as claimed in claim 6, wherein the preheated pellets are roasted in a rotary kiln at 1250-1270 ℃ for 25-30 min to obtain the roasted pellets.
9. The method for producing the magnesium pellets by using the oriented silicon steel magnesium oxide waste as claimed in claim 8, wherein the baked pellets are cooled by a circular cooler to obtain the magnesium pellets with the temperature lower than 150 ℃.
10. The method for producing the magnesium pellets by using the oriented silicon steel magnesia waste according to any one of claims 1 to 9, wherein the magnesium pellets have an MgO content of 1.0 to 3.0 wt%, a compressive strength of not less than 2500N/pellet and a reduction expansion rate of not more than 21%.
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| CN116532214A (en) * | 2023-03-01 | 2023-08-04 | 中天钢铁集团(南通)有限公司 | Method for applying iron ore powder on-line grinding to pellet production |
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| CN116532214B (en) * | 2023-03-01 | 2024-04-19 | 中天钢铁集团(南通)有限公司 | Method for applying iron ore powder on-line grinding to pellet production |
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