CN114763582B - Method for producing magnesium pellets by using oriented silicon steel magnesia waste - Google Patents
Method for producing magnesium pellets by using oriented silicon steel magnesia waste Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/242—Binding; Briquetting ; Granulating with binders
- C22B1/243—Binding; Briquetting ; Granulating with binders inorganic
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- C22B1/02—Roasting processes
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/24—Binding; Briquetting ; Granulating
- C22B1/2406—Binding; Briquetting ; Granulating pelletizing
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Abstract
The invention discloses a method for producing magnesia pellets by using oriented silicon steel magnesia waste, which adopts magnesia waste such as waste magnesia sludge, waste magnesia powder and the like in the oriented silicon steel production process, coarse iron ore powder, mirror hematite, magnetite concentrate, bentonite and limestone powder as raw materials, and the magnesia pellets are obtained by drying, preheating, roasting and cooling on a grate-rotary kiln-circular cooler after pretreatment, proportioning and pelletizing in sequence. The invention prepares the magnesium pellets by using the magnesium oxide waste, which is beneficial to reducing the environmental protection pressure caused by the magnesium oxide waste and the disposal cost generated during the outward transportation, and also can obviously reduce the manufacturing cost of the magnesium pellets, comprehensively utilizes the existing resources of steel plants, produces the magnesium pellets with environmental protection and low cost, provides high-quality raw materials for blast furnaces, and finally reduces the pollutant emission in the ironmaking process and 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 in particular relates to a method for producing magnesium pellets by using oriented silicon steel magnesium oxide waste.
Background
Along with the accelerated development of the industrial process of China, the demand for silicon steel is growing increasingly, and the Chinese steel industry realizes the rapid development of the silicon steel industry by introducing, digesting and independently innovating, and the annual growth rate reaches 10.5 percent. According to statistics, the total yield of the current Chinese silicon steel reaches 1236 ten thousand tons, wherein the oriented silicon steel reaches 134 ten thousand tons, and along with the increase of the yield, the amount of waste generated in the production process is increased. In the production process of oriented silicon steel, in order to prevent the silicon steel from binding during high-temperature annealing and promote desulfurization and denitrification reactions, magnesium oxide is required to be used as a separating 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, before high-temperature annealing, magnesium oxide is coated on the surface of strip steel in a certain thickness solution, after annealing is finished, a magnesium silicate bottom layer is formed on the surface of silicon steel, meanwhile, a part of magnesium oxide is remained, after a steel coil is uncoiled, a part of magnesium oxide is collected by a dust removal system in a solid dust form and becomes waste, and part of magnesium oxide is mixed with liquid and is discarded in a sludge form; the activity of the magnesium oxide powder is changed after high-temperature sintering, and meanwhile, the dust and mud are mixed with the partially transferred component elements of the silicon steel, so that the magnesium oxide powder cannot meet the requirements of continuous use in terms of components, activity and the like and can only be abandoned. If the annual yield of oriented silicon steel is 30 ten thousand tons, about 2000 tons of magnesia dust (dry basis) is produced, and the magnesia dust has the characteristics of high magnesia content, fine granularity and complex components, and is used as waste, so that the environmental pressure is increased and the huge waste of resources is caused.
Chinese patent CN105985533B discloses a method for preparing ultra-high molecular plastic additive from oriented silicon steel magnesium oxide waste, which uses magnesium oxide waste as raw material, through high temperature calcination (550-850 deg.c, 2-8 h) decarbonizing, obtaining activated waste, then ball milling and coating, then sieving, obtaining ultra-high molecular plastic additive.
Chinese patent CN104099469B discloses a method for utilizing waste magnesia powder after heat treatment of oriented silicon steel, which is mainly characterized in that magnesia waste is uniformly mixed with carbon powder and asphalt according to a certain weight ratio and is used for producing magnesia carbon balls for slag splashing and furnace protection of a converter, 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 proportioned according to a certain proportion, uniformly mixed, added with proper water, 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 a composite binder.
Chinese patent CN101550484a discloses an acidic magnesia pellet and its preparation method, mixing magnetite powder, bentonite and magnesium powder with particle size-200 mesh > 90%, adding water, pelletizing, drying; and (5) preheating and roasting to obtain magnesium-containing pellets with 50% reduction expansion rate reduced.
Chinese patent CN105039681B discloses a method for producing alkaline high magnesium pellet, mixing iron concentrate powder with magnesia-calcium brick powder, bentonite and coal powder according to a certain proportion, adding water to make pellets, drying, preheating and roasting to obtain the alkaline high magnesium pellet whose quaternary basicity is 1.15 and mgo content is greater 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 pellet ore containing calcium and magnesium and a preparation method thereof, wherein the pellet ore containing magnesium and weak magnetic concentrate, magnetite concentrate, light burned dolomite dust and bentonite are proportioned according to a certain proportion, water is added for pelletizing, and the pellet ore containing calcium and magnesium is obtained through drying, preheating and roasting; can solve the environmental protection problem caused by the piling of the light burned dolomite dust, and simultaneously reduces the dosage of bentonite after adding because the dust particle size is fine and the specific surface area is large, thereby reducingSiO in pellets 2 Is contained in the composition.
Chinese patent CN104263917B discloses a raw material for producing magnesia pellets by a belt conveyor and a production method of magnesia pellets, which are prepared by fully mixing iron-containing raw material, serpentine and bentonite in a certain proportion, adding water for pelletizing, drying by blowing by the belt conveyor, drying by suction, preheating, roasting, and cooling.
Chinese patent CN102102147B describes a process for producing magnesium pellets by a grate rotary kiln, wherein magnetite concentrate, bentonite and magnesite are uniformly mixed according to a certain proportion, water is added for pelletizing, raw pellets are fed into the grate for drying and preheating, and then preheated pellets are fed into the rotary kiln for roasting, and magnesium pellets are obtained after cooling, so that the proportioning of the pellets in blast furnace raw materials can be improved, the charging grade can be improved, and the metallurgical performance of furnace burden can be improved.
Besides, numerous researchers have disclosed the characteristics of magnesium-containing pellets in terms of preparation or metallurgical performance, such as "experimental study of low-alkalinity magnesia pellets" (Fan Xiaohui, gan Min, etc., steel, 2009, V44 (3)) "," industrial practice application of large-smelting iron ore to produce magnesia self-fluxing pellets "(white light star, xu Chunyan, etc., modern mining, 2019, (6))", "experimental study of Ma Gangqiu pellets to add light burned magnesia powder" (De Bo, section Yongshi, etc., anhui metallurgy, 2011, (2)) "," industrial experimental study of adding boromagnesia ore to produce magnesia pellets "(Huang Guixiang, zhen Cailing, etc., sintered pellets, 2016, V41 (6))", "preliminary experimental study of pellets to add magnesia binder" (Xi Yuming, shanxi metallurgy, 2011, (2)) "," experimental study and practice of producing magnesia pellets from steel "(He Jianfeng, liu Guofang, shandong metallurgy, 2011))", "influence of alkalinity and internal matching fuel on red-burning strength" (Zhu Deqing, shen Wenjun, etc., and (magnesium-containing magnesite, etc.), and (sintered pellets, sintered with the first 5, sintered pellets, fig. are prepared, etc.) (5, sintered pellets, and the like).
Thus, the patent and the publication related to the domestic magnesium-containing pellets basically take magnetite as raw material and oxygenMagnesium powder (burned magnesite), light burned dolomite, dolomite (MgCO) 3 +CaCO 3 ) Magnesite (MgCO) 3 ) The magnesium-containing pellets are obtained by taking olivine, calcium magnesium brick powder and the like as magnesium-containing flux, taking a belt conveyor or a grate-rotary kiln as production equipment and carrying out the processes of green pellet preparation, drying, preheating, roasting, cooling and the like. Dolomite and magnesite are usually used in the preparation process of the traditional magnesium-containing pellets, and although the cost is low, the strength of the preheated pellets and finished products in the process is reduced, and CO is caused during the use 2 The emission of (2) is increased, and the carbonate decomposition absorbs heat to cause the energy consumption to be increased; if light burned magnesium powder (MgO is more than or equal to 85%) is used, the strength of the preheated pellets and the strength of finished products are increased compared with the traditional magnesium-containing pellets, but the cost of the light burned magnesium powder is higher, the price of the light burned magnesium powder is usually up to 1200-1500 yuan/t, and the cost of the light burned magnesium powder is 28-35 yuan when the MgO content of the magnesium-containing pellets is 2 percent, and 23.5kg of the light burned magnesium powder is needed to be added into the pellets per ton. The uses of the silicon steel magnesia waste disclosed in the above related documents include the manufacture of polymer plastic additives, the manufacture of magnesium carbon spheres, and the like. The application of the oriented silicon steel magnesia wastes as the magnesium-containing pellet additive is not reported so far.
Therefore, if the oriented silicon steel magnesia waste can be used for producing the magnesium-containing pellets, not only can the magnesia waste be comprehensively utilized, but also the cost of the magnesia flux in the magnesium-containing pellets can be obviously reduced, and the produced magnesia pellets can be used for blast furnace production in high proportion, so that the pollutant emission in the iron-making process is reduced, and the oriented silicon steel magnesia 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 using oriented silicon steel magnesium oxide waste, which adopts magnesium oxide waste to prepare magnesium pellets, thereby being beneficial to reducing environmental protection pressure caused by magnesium oxide waste and saving disposal cost generated when the magnesium oxide waste is transported outwards, and being capable of remarkably reducing the manufacturing cost of the magnesium pellets, and besides solving the problem that the magnesium pellets prepared by dolomite and magnesite cause CO in the iron making process 2 Increased emissions and increased energy consumption due to carbonate decomposition and absorptionProblems; in the method for producing the magnesia pellets by using the oriented silicon steel magnesia waste, the existing resources of a steel plant are comprehensively utilized, so that the magnesia pellets with environmental friendliness and low cost are produced, high-quality raw materials are provided for a blast furnace, and finally, the pollutant emission in the iron-making process is reduced, and the environmental pollution is reduced.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a method for producing magnesia pellets by using oriented silicon steel magnesia waste comprises the following raw materials in percentage by weight on a dry basis:
coarse iron ore powder: 32-42%;
mirror image hematite: 42-52%;
magnetite concentrate: 9-16%;
waste magnesia sludge: 0.5 to 1.5 percent;
waste magnesia powder: 1 to 3 percent;
bentonite: 0.7 to 1.5 percent;
limestone powder: 2 to 6 percent.
Preferably, the method comprises the steps of:
s1, preprocessing, namely adding the waste magnesia sludge into coarse iron ore powder and mirror hematite subjected to ball milling treatment to form ore pulp, filtering and dehydrating, and carrying out high-pressure roller milling surface modification on the ore pulp and the magnetite concentrate to obtain mixed concentrate;
s2, batching, namely uniformly mixing the mixed concentrate obtained in the step S1 with the waste magnesia powder, the limestone powder and the bentonite to obtain a mixed material;
s3, pelletizing, namely adding water into the mixed material prepared in the step S2 to perform pelletizing, and screening out qualified green pellets;
s4, drying and roasting: and (3) 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 magnesia pellets.
Preferably, the coarse iron ore powder is iron ore powder for sintering, and the granularity is 0-8 mm;
the granularity 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 magnesia sludge is 40-60 wt%, and the MgO content of the waste magnesia sludge dry basis is more than or equal to 60wt%;
the granularity of the waste magnesia powder is less than 0.074mm and accounts for more than 90%, and the MgO content is more than or equal to 90wt%;
the bentonite is bentonite for pellets;
the limestone powder has a granularity less than 0.074mm and more than 85%, and a specific surface area more than or equal to 3500cm 2 And/g, caO content is more than or equal to 50wt%.
Preferably, in the step S1, water is added to the waste magnesia sludge before pretreatment, and the waste magnesia sludge is diluted to a water content of 80 to 90wt%.
Preferably, in the step S1, the water content of the bulk concentrate is 6-8wt% and the specific surface area is more than or equal to 1800cm 2 /g。
Preferably, in the step S2, the water content of the mixture is 6 to 8wt%.
Preferably, in the step S3, the water content of the qualified green pellets is 8-10wt% and the particle size is 8-18 mm.
Preferably, in the step S4, the qualified green pellets are sequentially subjected to forced air drying, air draft drying and preheating in a chain grate machine to obtain preheated pellets; the preheating temperature is 1030-1070 ℃ and the preheating time is 9-11 min during the preheating.
Preferably, the compressive strength of the preheated pellets is 380-410N/each (the compressive 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 magnesia pellets is 1.0-3.0 wt%, the compressive strength is more than or equal to 2500N/magnesium 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 magnesia waste provided by the invention has the following beneficial effects:
1) The method for producing the magnesium pellets by using the oriented silicon steel magnesia waste can recycle waste such as waste magnesia sludge, magnesia powder and the like in the silicon steel production flow, and can prepare the magnesium-containing pellets which can be used in a blast furnace in a manner of not producing secondary pollution, thereby realizing the efficient utilization of solid waste resources, reducing environmental pollution, realizing reasonable use diameter and large use amount, consuming the waste such as waste magnesia sludge, magnesia powder and the like in a factory in a full amount, efficiently utilizing the solid waste and being beneficial to environmental protection;
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, basically do not contain carbonates, and avoid the traditional magnesium-containing pellets from using dolomite (MgCO) 3 +CaCO 3 ) Magnesite (MgCO) 3 ) CO brought by MgO adjustment 2 The emission of the magnesium-containing pellets is increased, and the energy consumption is increased due to carbonate decomposition heat absorption, so that the energy conservation, emission reduction, cleaning and low carbonization of the magnesium-containing pellets in the production process are facilitated;
3) The method is characterized in that hematite is used as a main raw material, dolomite and magnesite are used for producing magnesia pellets in the prior art, although the price is low, the compression strength of the preheated pellets is 300-500N/min, the standard preheated pellets are 380-580N/min, the compression strength of the finished pellets is 2400-2700N/min, the standard finished pellets are 2500-3000N/min, the strength of the preheated pellets and the finished pellets are 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 up to 1200-1500 yuan/t, calculated by the MgO content of the pellets, and the cost of the pellets is 28-35 yuan, wherein 23.5kg of light burned magnesium powder is needed to be matched with each ton of pellets; the waste magnesia dust mud is used as solid waste, and the conventional external transportation also provides disposal cost, so that if the waste magnesia dust mud can be consumed in a factory, the disposal cost can be saved, the waste magnesia dust mud can replace high-price light-burned magnesium powder, and the production cost of magnesium-containing pellets can be reduced;
4) Along with the rapid development of the industries such as the power industry, household appliances, new energy automobiles and the like, the demand of oriented silicon steel is increased, and the production amount of waste magnesia dust mud is synchronously increased; meanwhile, as the requirements of blast furnace smelting technology are improved, the requirements of magnesium-containing pellets are increased increasingly, and the method for producing the magnesium pellets by using the oriented silicon steel magnesium oxide waste can organically combine the magnesium-containing pellets with the oriented silicon steel magnesium oxide waste, thereby being beneficial to reducing the environmental protection pressure caused by waste magnesium oxide dust mud, effectively reducing the manufacturing cost of the magnesium-containing pellets, having environmental protection benefit, economic benefit and social benefit and having 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 magnesia waste.
Detailed Description
In order to better understand the above technical solution of the present invention, the technical solution of the present invention is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1, the raw materials for producing the magnesia pellets by using the oriented silicon steel magnesia waste provided by the invention comprise the following components in percentage by weight on a dry basis:
coarse iron ore powder: 32-42%;
mirror image hematite: 42-52%;
magnetite concentrate: 9-16%;
waste magnesia sludge: 0.5 to 1.5 percent;
waste magnesia powder: 1 to 3 percent;
bentonite: 0.7 to 1.5 percent;
limestone powder: 1.8 to 6 percent.
Wherein the coarse-grain iron ore powder is iron ore powder for sintering, the granularity is 0-8 mm, and the lower limit is not contained; the granularity of the mirror image hematite is 0-1 mm, and the lower limit is not contained; 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 to 60 weight percent, and the MgO content in a dry basis is more than or equal to 60 weight percent; the granularity of the waste magnesia powder is less than 0.074mm and accounts for more than 90%, and the MgO content is more than or equal to 90wt%; bentonite is bentonite for pellets; limestone powder is prepared by conventional limestone fine grinding, and has particle size less than 0.074mm and more than 85%, and specific surface area greater than or equal to 3500cm 2 And/g, caO content is more than or equal to 50wt%.
The raw materials are subjected to pretreatment, proportioning and pelletizing in sequence, and then are dried, preheated, roasted and cooled on a grate-rotary kiln-circular cooler to obtain the magnesium pellets. The method for producing the magnesia pellets by using the oriented silicon steel magnesia waste specifically comprises the following steps:
s1, preprocessing, namely adding waste magnesia sludge into coarse-grained iron ore powder and mirrored hematite subjected to ball milling treatment to form ore pulp, filtering and dehydrating, and carrying out surface modification on the ore pulp and magnetite concentrate through a high-pressure roller mill to obtain mixed concentrate;
the specific process is as follows: adding water into the waste magnesia sludge to dilute the waste magnesia sludge until the water content is 80-90 wt% after the raw material components are proportioned, and taking the waste magnesia sludge as slurry for standby; respectively ball milling coarse-grained iron ore powder and mirror hematite, adding the slurry obtained by diluting waste magnesia sludge into the ball milled coarse-grained iron ore powder and mirror hematite to form ore slurry, filtering and dehydrating the ore slurry, and carrying out high-pressure roller mill surface modification on the ore slurry and the magnetite concentrate 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 A/g (specific surface area herein is Bo's specific surface area) of bulk concentrate; in a further preferred embodiment, the specific surface area of the bulk concentrate is 1800-2000 cm 2 /g。
In the process, the waste magnesia sludge is prepared into slurry with water content of 80-90 wt% by adding water, and the slurry and iron ore (coarse-grained iron ore powder and mirror hematite) after ball milling treatment enter a filter together, so that the high energy consumption links of drying, granulating and the like of the waste magnesia sludge in the traditional utilization mode are avoided, the waste magnesia sludge and the iron ore (coarse-grained iron ore powder and mirror hematite) after ball milling treatment can be uniformly mixed and dispersed in the form of slurry, and the mixed iron ore containing magnesia with water content of 6-8 wt% is obtained after filtering; after the mixed iron ore containing magnesium oxide and magnetite concentrate with the granularity meeting the requirement and free from ball milling are mixed, 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 more than or equal to 1800cm through the surface modification 2 And/g, so as to ensure that after pelletizing, the green pellets fall down and the compressive strength reaches the production requirement.
S2, batching, namely uniformly mixing the mixed concentrate obtained in the step S1 with waste magnesia powder, limestone powder and bentonite to obtain a mixed material;
the specific process is as follows: adding waste magnesia powder, limestone powder and bentonite into the mixed concentrate prepared in the step S1 to ensure that the alkalinity and MgO content of the subsequently prepared magnesia pellets meet the requirements of a blast furnace, and fully and uniformly mixing the mixture by a strong mixer to obtain a mixed material with the water content of 6-8wt%; the purpose of mixing by adopting a powerful mixer is to ensure that a small amount of dry powder-shaped raw material components such as waste magnesia powder, limestone powder and bentonite are uniformly dispersed into the mixed concentrate, so that the stability in the subsequent pelletizing process and the uniformity of magnesia pellets are ensured.
The waste magnesia powder mainly plays the roles in the process that: (1) The superfine waste magnesia powder has large specific surface area and plays a role in improving green ball strength during subsequent pelletizing; (2) The waste magnesia powder has higher MgO content, can provide MgO required by the magnesia pellets, and improves the reduction expansion rate of the magnesia pellets. The limestone powder has the main functions of regulating the alkalinity of the pellets, forming calcium ferrite phases in the pellets and improving the pressure intensity of the pellets. The bentonite is conventional bentonite for pellets, and has the main effects of improving the green pellet performance, especially improving the green pellet falling strength and reducing the cracking of the green pellets in the process of shipping.
S3, pelletizing, namely adding water into the mixed material prepared in the step S2 to perform pelletizing, and screening out qualified green pellets;
the specific process is as follows: adding a small amount of water into the mixed material prepared in the step S2 to pelletize, preparing green pellets, and screening the green pellets with the particle size ranging from 8mm to 18mm to serve as qualified green pellets; in still a further preferred embodiment, green pellets having a particle size in the range of 8 to 16mm are acceptable green pellets. The water content added in the process is 8-10wt% of the weight of the mixed material, so that the material with high specific surface area gradually grows up in the rolling process in the pelletizer under the action of water, and the fine particle material is aggregated into balls to reach a certain granularity.
S4, drying and roasting: and (3) 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 magnesia pellets.
The specific process is as follows: sending the qualified green pellets screened in the step 3 into a chain grate machine, and preheating for 9-11 min at 1030-1070 ℃ sequentially through forced air drying, air draft drying to obtain preheated pellets with 380-410N/compression strength; then roasting the preheated pellets in a rotary kiln at 1250-1270 ℃ for 25-30 min to obtain roasted pellets; and cooling the baked pellets by a circular cooler to obtain 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 temperatures of the magnesium pellets are 20-40 ℃ higher than those of the conventional high hematite ratio fluxed pellets, and the strength of the finished pellets is ensured to be more than or equal to 2500N/pellet.
The detection proves that the MgO content of the magnesia pellet is 1.0 to 3.0 weight percent, the iron grade is more than or equal to 64 weight percent, and the alkalinity (CaO/SiO) 2 ) 0.3 to 0.8, compressive strength is more than or equal to 2500N/min, and reduction expansion rate is less than or equal to 21 percent; wherein the reduction expansion rate is detected by using a GB/T13240-2018 method.
The method for producing magnesia pellets by using the oriented silicon steel magnesia waste according to the invention is further described below with reference to specific examples, wherein the following raw materials in examples 1 to 4 comprise the following components: the coarse iron ore powder is iron ore powder for sintering, and the granularity is 0-8 mm; the granularity 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 magnesia sludge is 40 to 60 weight percent, and the MgO content in a dry basis is more than or equal to 60 weight percent; the granularity of the waste magnesia powder is less than 0.074mm and accounts for more than 90%, and the MgO content is more than or equal to 90wt%; bentonite is bentonite for pellets; limestone powder is prepared by conventional limestone fine grinding, and has particle size less than 0.074mm and more than 85%, and specific surface area greater than or equal to 3500cm 2 And/g, caO content is more than or equal to 50wt%.
Reference example (no magnesium oxide waste added):
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%;
mirror image hematite: 44%;
magnetite concentrate: 15%;
bentonite: 1.0%;
limestone powder: 5%.
In the method for producing the reference pellets in the reference example, firstly, the raw material components are proportioned, and the method specifically comprises the following steps:
(1) Pretreatment: respectively ball milling coarse-grained iron ore powder and mirror image hematite, filtering and dewatering, and surface-modifying with magnetite concentrate by high-pressure roller mill to obtain the product with water content of 6-8wt% and specific surface area of more than or equal to 1800cm 2 A/g bulk concentrate;
(2) And (3) batching: adding limestone powder and bentonite into the mixed concentrate prepared in the step (1), and fully and uniformly mixing the mixed concentrate by a strong mixer to obtain a mixed material with the water content of 6-8wt%;
(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) to pelletize, preparing green pellets, and screening the green pellets with the particle size in the range of 8-16 mm to obtain 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 forced air drying, air draft drying and preheating at 1030 ℃ for 11min to obtain preheated pellets with the compressive strength of 410N/g; then roasting the preheated pellets in a rotary kiln for 28min at 1230 ℃ to obtain roasted pellets; cooling the baked pellets by a circular cooler to obtain reference pellets with the temperature lower than 150 ℃;
the chemical composition of the above prepared reference pellets was examined and shown in the reference example in Table 1, wherein the MgO content of the reference pellets was 0.2wt%, the iron grade was 65.0wt%, and the basicity (CaO/SiO) 2 ) 0.8; and the index of the reference pellet is detected, the compressive strength is 3020N/each, and the reduction expansion rate is 23%.
Example 1
The raw materials used for producing the magnesia pellets in the embodiment comprise the following components in percentage by weight on a dry basis:
coarse iron ore powder: 36.7%;
mirror image hematite: 44%;
magnetite concentrate: 15%;
waste magnesia sludge: 0.5%;
waste magnesia powder: 1.0%;
bentonite: 1.0%;
limestone powder: 1.8%.
In the method for producing the magnesium pellets by using the oriented silicon steel magnesia 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 magnesia sludge to dilute until the water content is 80-90 wt% and using the waste magnesia sludge as slurry for standby; respectively ball milling coarse-grained iron ore powder and mirror hematite, adding the slurry obtained by diluting waste magnesia sludge into the ball milled coarse-grained iron ore powder and mirror hematite to form ore slurry, filtering and dehydrating the ore slurry, and carrying out high-pressure roller mill surface modification on the ore slurry and the magnetite concentrate 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 A/g bulk concentrate;
(2) And (3) batching: adding waste magnesia powder, limestone powder and bentonite into the mixed concentrate prepared in the step (1), and fully and uniformly mixing the mixed concentrate by a strong mixer to obtain a mixed material with the water content of 6-8wt%;
(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) to pelletize, preparing green pellets, and screening the green pellets with the particle size in the range of 8-16 mm to obtain 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 forced air drying, induced draft drying and preheating at 1050 ℃ for 11min to obtain preheated pellets with 380N/compression strength; then roasting the preheated pellets in a rotary kiln for 28min at 1250 ℃ to obtain roasted pellets; cooling the baked pellets by a circular cooler to obtain magnesium pellets with the temperature lower than 150 ℃;
the chemical composition of the magnesium pellets prepared above was detected as shown in example 1 of Table 1, wherein the magnesium pellets had MgO content of 1.2wt%, iron grade of 64.9wt%, and basicity(CaO/SiO 2 ) 0.3; and the metallurgical index of the magnesium pellets is detected, the compressive strength is 2950N/magnesium pellet, and the reduction expansion rate is 21%.
Example 2
The raw materials used for producing the magnesium pellets in this example are as follows:
coarse iron ore powder: 44.4%;
mirror image hematite: 42%;
magnetite concentrate: 9%;
waste magnesia sludge: 0.8%;
waste magnesia powder: 1.0%;
bentonite: 1.0%;
limestone powder: 1.8%.
In the method for producing the magnesium pellets by using the oriented silicon steel magnesia 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 magnesia sludge to dilute until the water content is 80-90 wt% and using the waste magnesia sludge as slurry for standby; respectively ball milling coarse iron ore powder and mirrored hematite, adding the coarse iron ore powder and mirrored hematite into the ball milled coarse iron ore powder and mirrored hematite to form ore pulp, filtering and dewatering the ore pulp, and carrying out high-pressure roller mill surface modification on the ore pulp and the magnetite concentrate to obtain the product with the water content of 6-8wt% and the specific surface area of more than or equal to 1800cm 2 A/g bulk concentrate;
(2) And (3) batching: adding waste magnesia powder, limestone powder and bentonite into the mixed concentrate prepared in the step (1), and fully and uniformly mixing the mixed concentrate by a strong mixer to obtain a mixed material with the water content of 6-8wt%;
(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) to pelletize, preparing green pellets, and screening the green pellets with the particle size in the range of 8-16 mm to obtain 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 forced air drying, induced draft drying and preheating at 1060 ℃ for 11min to obtain preheated pellets with 390N/pieces of compressive strength; then roasting the preheated pellets in a rotary kiln for 30min at 1260 ℃ to obtain roasted pellets; cooling the baked pellets by a circular cooler to obtain magnesium pellets with the temperature lower than 150 ℃;
the chemical composition of the magnesium pellets prepared above was examined as shown in example 2 in Table 1, wherein the magnesium pellets had MgO content of 1.5wt%, iron grade of 64.8wt%, and basicity (CaO/SiO) 2 ) 0.3; then, the metallurgical index of the magnesium pellets is detected, the compressive strength is 2900N/magnesium pellets, and the reduction expansion rate is 19%.
Example 3
The raw materials used for producing the magnesia 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%;
magnetite concentrate: 11%;
waste magnesia sludge: 1.0%;
waste magnesia powder: 2.2%;
bentonite: 0.9%;
limestone powder: 1.8%.
In the method for producing the magnesium pellets by using the oriented silicon steel magnesia 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 magnesia sludge to dilute until the water content is 80-90 wt% and using the waste magnesia sludge as slurry for standby; respectively ball milling coarse iron ore powder and mirrored hematite, adding the coarse iron ore powder and mirrored hematite into the ball milled coarse iron ore powder and mirrored hematite to form ore pulp, filtering and dewatering the ore pulp, and carrying out high-pressure roller mill surface modification on the ore pulp and the magnetite concentrate to obtain the product with the water content of 6-8wt% and the specific surface area of more than or equal to 1800cm 2 A/g bulk concentrate;
(2) And (3) batching: adding waste magnesia powder, limestone powder and bentonite into the mixed concentrate prepared in the step (1), and fully and uniformly mixing the mixed concentrate by a strong mixer to obtain a mixed material with the water content of 6-8wt%;
(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) to pelletize, preparing green pellets, and screening the green pellets with the particle size in the range of 8-16 mm to obtain 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 forced air drying, induced draft drying and preheating at 1070 ℃ for 11min to obtain preheated pellets with the compressive strength of 385N/pellet; roasting the preheated pellets in a rotary kiln for 30min at 1270 ℃ to obtain roasted pellets; cooling the baked pellets by a circular cooler to obtain magnesium pellets with the temperature lower than 150 ℃;
the chemical composition of the magnesium pellets prepared above was examined as shown in example 3 in Table 1, wherein the magnesium pellets had MgO content of 2.5wt%, iron grade of 64.6wt%, and basicity (CaO/SiO) 2 ) 0.3; then the index of the magnesium pellet is detected, the compressive strength is 2820N/magnesium pellet, and the reduction expansion rate is 16%.
Table 1 the reference pellets prepared in the reference example and the components (wt%) of the magnesia pellets prepared in examples 1 to 3
| TFe | SiO 2 | CaO | MgO | Al 2 O 3 | 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 |
As is clear from the reference examples, examples 1 to 3 and table 1, the MgO content of the reference pellets in the reference examples was low, only 0.2wt%, and the effect of suppressing the reduction expansion rate of the pellets could not be achieved, so that the reduction expansion rate of the pellets in the reference examples was high relative to the magnesium pellets of examples 1 to 3, and therefore the use of the reference pellets in the reference examples in a high proportion (> 15%) adversely affected the blast furnace gas permeability, the pressure difference and the production stability.
In conclusion, the MgO content of the magnesia pellet is 1.0 to 3.0 weight percent, the iron grade is more than or equal to 64 weight percent, and the SiO is the same as that of the magnesia pellet 2 The content is less than or equal to 3 weight percent, al 2 O 3 The content is less than or equal to 1.0 weight percent, the compressive strength is 2800 to 3000N/min, and the reduction expansion rate is 16 to 21 percent; compared with magnesia pellets (usually 2400-2700N/compression strength and 20-24% reduction expansion rate) prepared from dolomite and magnesite in the prior art, the magnesia pellets prepared in the invention do not contain carbonates, so that CO is not discharged when the magnesia pellets are used in the iron making process 2 And the energy consumption in the iron making process is not increased due to the heat absorption of carbonate decomposition.
It will be appreciated by persons skilled in the art that the above embodiments are provided for illustration only and not for limitation of the invention, and that variations and modifications of the above described embodiments are intended to fall within the scope of the claims of the invention as long as they fall within the true spirit of the invention.
Claims (9)
1. The method for producing the magnesium pellets by using the oriented silicon steel magnesia waste is characterized in that the raw materials for producing the magnesium pellets comprise the following components in percentage by weight on a dry basis:
coarse iron ore powder: 32-42%;
mirror image hematite: 42-52%;
magnetite concentrate: 9-16%;
waste magnesia sludge: 0.5 to 1.5 percent, wherein the water content of the waste magnesia sludge is 40 to 60 percent by weight, and the MgO content of the waste magnesia sludge dry basis is more than or equal to 60 percent by weight;
waste magnesia powder: 1-3%, wherein the granularity of the waste magnesia powder is less than 0.074mm and accounts for more than 90%, and the MgO content is more than or equal to 90% by weight;
bentonite: 0.7 to 1.5 percent;
limestone powder: 1.8 to 6 percent,
the method comprises the following steps:
s1, preprocessing, namely adding the waste magnesia sludge into coarse-grained iron ore powder and mirrored hematite subjected to ball milling treatment to form ore pulp, filtering and dehydrating, and carrying out surface modification on the ore pulp and the magnetite concentrate by high-pressure roller mill to obtain mixed concentrate, wherein in the step S1, water is added into the waste magnesia sludge before preprocessing, and the water content is diluted to 80-90 wt%;
s2, batching, namely uniformly mixing the mixed concentrate obtained in the step S1 with the waste magnesia powder, the limestone powder and the bentonite to obtain a mixed material;
s3, pelletizing, namely adding water into the mixed material prepared in the step S2 to perform pelletizing, and screening out qualified green pellets;
s4, drying and roasting: and (3) 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 magnesia pellets.
2. The method for producing magnesium pellets by using oriented silicon steel magnesia waste according to claim 1, wherein the coarse iron ore powder is iron ore powder for sintering, and the granularity is 0-8 mm;
the granularity 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 bentonite is bentonite for pellets;
the limestone powder has a granularity less than 0.074mm and more than 85%, and a specific surface area more than or equal to 3500cm 2 And/g, caO content is more than or equal to 50wt%.
3. The method for producing magnesium pellets by using oriented silicon steel magnesium oxide waste as claimed in claim 1, wherein in the step S1, the water content of the bulk concentrate is 6-8wt%, and the specific surface area is not less than 1800cm 2 /g；
In the step S2, the water content of the mixed material is 6-8wt%.
4. The method for producing magnesium pellets from oriented silicon steel magnesium oxide waste according to claim 1, wherein in the step S3, the water content of the qualified green pellets is 8-10 wt%, and the grain size is 8-18 mm.
5. The method for producing magnesium pellets by using oriented silicon steel magnesia waste according to claim 1, wherein in the step S4, the qualified green pellets are sequentially subjected to blast drying, induced draft drying and preheating in a chain grate machine to obtain preheated pellets; the preheating temperature is 1030-1070 ℃ and the preheating time is 9-11 min during the preheating.
6. The method for producing magnesium pellets from oriented silicon steel magnesium oxide waste as claimed in claim 5, wherein the compressive strength of the preheated pellets is 380-410N/pieces.
7. The method for producing magnesium pellets by using oriented silicon steel magnesia waste according to claim 5, wherein the preheated pellets are roasted in a rotary kiln at 1250-1270 ℃ for 25-30 min to obtain roasted pellets.
8. The method for producing magnesium pellets by using oriented silicon steel magnesia waste according to claim 7, wherein the roasted pellets are cooled by an annular cooler to obtain magnesium pellets with a temperature lower than 150 ℃.
9. The method for producing magnesium pellets by utilizing oriented silicon steel magnesia waste according to any one of claims 1 to 8, wherein the MgO content of the magnesium pellets is 1.0 to 3.0wt%, the compressive strength is more than or equal to 2500N/min, and the reduction expansion rate is less than or equal to 21%.
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