CN107721456B - Anti-corrosion iron ore tailing ceramsite and preparation method thereof - Google Patents

Anti-corrosion iron ore tailing ceramsite and preparation method thereof Download PDF

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CN107721456B
CN107721456B CN201710981768.5A CN201710981768A CN107721456B CN 107721456 B CN107721456 B CN 107721456B CN 201710981768 A CN201710981768 A CN 201710981768A CN 107721456 B CN107721456 B CN 107721456B
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ceramsite
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iron ore
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CN107721456A (en
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徐国涛
张洪雷
刘黎
李伟
徐林
骆福辉
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Wuhan Iron and Steel Co Ltd
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Wuhan Iron and Steel Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B38/00—Porous mortars, concrete, artificial stone or ceramic ware; Preparation thereof
    • C04B38/009—Porous or hollow ceramic granular materials, e.g. microballoons
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B33/00—Clay-wares
    • C04B33/02—Preparing or treating the raw materials individually or as batches
    • C04B33/13—Compounding ingredients
    • C04B33/132—Waste materials; Refuse; Residues
    • C04B33/1321—Waste slurries, e.g. harbour sludge, industrial muds
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B33/00—Clay-wares
    • C04B33/02—Preparing or treating the raw materials individually or as batches
    • C04B33/13—Compounding ingredients
    • C04B33/132—Waste materials; Refuse; Residues
    • C04B33/1324—Recycled material, e.g. tile dust, stone waste, spent refractory material
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B33/00—Clay-wares
    • C04B33/02—Preparing or treating the raw materials individually or as batches
    • C04B33/13—Compounding ingredients
    • C04B33/132—Waste materials; Refuse; Residues
    • C04B33/138—Waste materials; Refuse; Residues from metallurgical processes, e.g. slag, furnace dust, galvanic waste
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/65—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes
    • C04B2235/656—Aspects relating to heat treatments of ceramic bodies such as green ceramics or pre-sintered ceramics, e.g. burning, sintering or melting processes characterised by specific heating conditions during heat treatment
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/74—Physical characteristics
    • C04B2235/77—Density
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
    • C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
    • C04B2235/96—Properties of ceramic products, e.g. mechanical properties such as strength, toughness, wear resistance
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/60—Production of ceramic materials or ceramic elements, e.g. substitution of clay or shale by alternative raw materials, e.g. ashes

Abstract

An anti-corrosion iron ore tailing ceramsite comprises the following raw materials in percentage by weight: granuleHard clay with the degree less than or equal to 0.088 mm: 28-50%, and converter steel slag with the granularity less than or equal to 0.088 mm: 10-40%, and iron ore tailings with the particle size of less than or equal to 0.088 mm: 5-45%, bentonite with the particle size less than or equal to 0.088 mm: 5-10%, waste plastic powder with granularity less than or equal to 0.1 mm: 0.05-3%, and municipal sludge: 1-5%; the preparation method comprises the following steps: mixing all the materials; putting the raw pellets into a cylindrical pelletizer or a disc pelletizer to manufacture green pellets; drying; preheating; roasting; naturally cooling to room temperature for later use. The invention utilizes the technical measures of manufacturing the ceramsite by utilizing the tailings and the steel slag, can utilize secondary resources to the maximum extent, changes waste into valuable, and utilizes a 500 ten thousand ton pellet production line to produce the ceramsite with the volume density of 1.70-2.10 g/cm3And the cost of the ceramsite product with the compressive strength of 3-9 KN per ton of ceramsite can be reduced by not less than 10%.

Description

Anti-corrosion iron ore tailing ceramsite and preparation method thereof
Technical Field
The invention relates to the technical field of inorganic materials, in particular to ceramsite prepared by using iron ore tailings and other wastes and a method. It is suitable for making building material, heat insulating material and planting carrier material.
Background
The reduction of the production cost is one of the important strategies of enterprises and countries, is one of the important measures for improving the competitiveness of the enterprises, and is particularly more important for steel enterprises.
Before the invention, the using amount of pellets in the blast furnace burden is 20 percent, the using amount of pellets in 2017 in 8 months is reduced to 14 percent, and the using amount of pellets in Meishan steel bases and Zhanjiang bases is 5 to 8 percent, so that the using amount of the pellets can reach 25 percent of the original using amount at the lowest. The maximum difficulty is that more than 300 million tons of production capacity is surplus probably, and the production pressure of the pellets cannot be reduced; the cost reduction pressure of the Ezhou pellet company Limited is increased, the full-load pellet sales is difficult, and the production cost is increased due to insufficient load. The production of ceramsite by a rotary kiln has a history, but the production of ceramsite is 10-50 ten thousand tons in scale, and the cost is high; billions of tons of iron ore tailings are stored, resources are wasted, and disaster hidden danger exists; the pellet and the ceramsite have feasibility; in the process of researching the production of the iron ore tailings, the applicant finds that the excessive amount of the iron ore tailings causes the problem of salting out of sulfuric acid in the tailings, and secondary pollution is easily caused.
How to utilize iron tailings raw materials to produce ceramsite products suitable for building and heat-insulating materials can change waste into valuable, obtain comprehensive utilization, and reduce pollution to the environment, so that how to inhibit sulfate ions in the tailings is a very key technology.
The technology of the invention utilizes hard clay and tailing resources to produce modified ceramsite products with stable acid radical ions, and the modified ceramsite products can be used for building materials and heat-insulating materials.
Through patent retrieval:
the method is characterized in that the ceramsite comprises the following raw materials of shale, fly ash, clay and additive = 71: 10: 15: 4. the optimal firing process parameters obtained by test methods such as orthogonal design are as follows: drying temperature: 110 ℃, drying time: 2 h; preheating temperature: 400 ℃, preheating time: 15 min; the roasting temperature is 1200 ℃ and the roasting time is 5 min. The bulk density of the industrial production is 470 kg/m3The cylinder pressure strength is 2.3 MPa, and the water absorption rate is 2.1 percent. The method has the problems of insufficient raw material sources and high cost.
The Chinese patent No. CN201310620026.1 discloses a low-silicon iron tailing expanded ceramsite and a preparation method thereof, which comprises the following raw materials: 50-60 parts of iron tailing powder, 37-47 parts of clay or kaolin or bentonite and 0-3 parts of coal. The silicon oxide in the iron tailing powder is less than 40 percent, and 5-25 mm of ceramsite can be produced. Drying at the preheating temperature of 105-130 ℃ for 2-4h, preheating at 600-900 ℃ for 10-15 min, roasting at the roasting temperature of 1050-1150 ℃ for 10-15 min, and obtaining the sintered product with the bulk density of 650kg/m3The ceramsite product has the cylinder pressure strength of 5.43MPa and the water absorption of 8.75 percent. The product can be used as building lightweight concrete aggregate and heat-insulating material. The invention has the advantages of less iron tailings, large clay and bentonite consumption, low strength during pelletizing and easy green ball pulverization, and the addition of the coal powder can increase pores but increase the cracking of the ceramsite.
Chinese patent No. CN201510277931.0A method for preparing ultra-light ceramsite from clay iron-containing tailings is characterized in that the raw materials of the ceramsite comprise 40-48% of the clay iron-containing tailings, 40-48% of coal-series kaolin or coal gangue and 8-15% of dewatered sludge. The preparation process flow comprises the steps of mixing, pelletizing, drying, preheating, roasting and cooling. Under the process conditions of preheating temperature of 500-600 ℃, roasting temperature of 1250-1350 ℃ and temperature rising speed of 10-15 ℃/min, the sintered bulk density is 390kg/m3The cylinder pressure strength is 1.2MPa, and the water absorption rate is 3.8 percent. The invention uses coal series kaolin or coal gangue with large amount, difficult pelletizing, easy sand forming of dehydrated sludge, poor viscosity, acidity of iron tailings after flotation, no solidification, easy corrosion of equipment, low cylinder pressure strength and relatively large bulk density.
Chinese patent No. CN200910144295.9 discloses an iron ore tailing ceramsite and a preparation method thereof, and is characterized in that the ceramsite comprises 60-70% of iron ore tailing, 25-40% of clay and 1-3% of straw powder. The preparation process comprises the steps of mixing, granulating, drying, roasting and cooling. Drying at a preheating temperature of 100-110 ℃ for 6-8h, and roasting at a roasting temperature of 1120-1200 ℃ for 6-8 min to obtain a bulk density of 490-702 kg/m-3The ceramsite product. The invention adopts the straw powder, which is easy to absorb water and expand, so that the strength is low during pelletizing, and the raw pellets are easy to pulverize to cause cracking of the ceramsite.
China patent No. CN201610019831.2 discloses a desulfurized gypsum and iron tailing ceramsite and a preparation method thereof, and is characterized in that the ceramsite comprises 50-60 parts of iron tailings, 10-20 parts of desulfurized gypsum, 20-30 parts of fly ash and 0-6 parts of coal powder. The preparation process comprises the steps of mixing, granulating, drying, roasting and cooling. Drying at 100-120 ℃ for 4-6h, preheating at 260-500 ℃ for 8-15min, and calcining at 1080-1200 ℃ for 25-35 min to obtain the product with bulk density of 700-3And the ceramsite product has the cylinder pressure strength of 4-6MPa and the water absorption of 5-10 percent. The invention uses large amount of fly ash, the combustion of the fly ash is easy to generate gas, the pelletizing is difficult, the acidity of the desulfurized gypsum is large, sulfuric acid mist is easy to generate, the iron tailings are acidic after flotation, and the iron tailings are not solidified and are easy to corrode equipment.
In the document of the performance characteristics and firing process of sludge ceramsite, the proportion of clay, silt and sand in the sludge to be researched is 10.15%, 60.92% and 27.94% respectively; the sludge has the basic condition for firing sludge ceramsite. At 1050-1125 ℃, the bulk density of the fired sludge ceramsite is slightly higher than the requirement of the national standard on light coarse aggregates, but the physical properties of the fired sludge ceramsite reach the standard of high-mechanical-property ceramsite, particularly the compression strength of the fired sludge ceramsite is maximum at 1075 ℃, the fired sludge ceramsite reaches 71.7 MPa, and the apparent density is 2.45 g/cm3. Under the firing temperature of 900-1075 ℃, the compressive strength and the apparent density of the sludge ceramsite are increased along with the increase of the firing temperature; when firing temperature>At 1075 ℃, the compression strength and the apparent density of the sludge ceramsite are reduced along with the increase of the firing temperature. The method has the problems that the raw material viscosity is too high, the pellet production is not facilitated, and the cost is high.
The literature, "experimental research on preparing ceramsite by using steel slag", determines that the formula of the ceramsite is as follows: 75% of fly ash, 10% of steel slag, 10% of clay and 5% of carbon powder. The optimal firing process parameters obtained by test methods such as orthogonal design are as follows: preheating temperature: 600 ℃, preheating time: 20 min; the sintering temperature is 1230 ℃, and the sintering time is 4 min. The periphery of the section of the sintered ceramsite is a brown-gray compact shell, and a loose honeycomb structure is formed inside the sintered ceramsite. The external surface of the porcelain granule has obvious glaze luster. The bulk density can reach 830 Kg/m3The cylinder pressure strength can reach 6.8 MPa, and the water absorption rate is 3.01 percent. All indexes of the ceramsite meet the requirement of high-strength ceramsite specified in GB/T17431.1. As can be seen from XRD and SEM analysis, most of the inside of the ceramsite is glass bodies of silicate and aluminate, and a loose and porous honeycomb structure is formed. The system analyzes the effect of the chemical components of the steel slag in the process of firing ceramsite and the mechanism of expansion of the ceramsite, and researches show that: the chemical components and mineral compositions of the steel slag play an important role in the expansion and fluxing of the ceramsite in the sintering process. The document shows that steel slag can also be used for producing ceramsite.
Chinese patent No. CN201510273757.2 discloses a light high-strength ceramsite and a preparation process thereof, and is characterized in that the ceramsite comprises 5-15 parts of kaolin tailings, 55-65 parts of coal gangue and 20-40 parts of fly ash which are mixed to be used as a base material, and then the mixture is mixed and pelletized according to the proportion of 100 parts of the base material and 1.5-3 parts of pore-forming agent; the pore-forming agent is rice hull, carbonate, high calcium fly ash, etc. And roasting at 1050 ℃ for 10-20 min to obtain the ceramsite product. The invention is mainly ridge material, has poor adhesion and poor balling property, and is difficult to ensure the product quality in large-scale industrial production. The method has the problems of insufficient raw material sources and high cost.
In the literature, "production of ceramsite by using waste residues and energy conservation and emission reduction measures of ceramsite production lines", the main method for producing ceramsite by using fly ash comprises the following steps: (1) a rotary kiln method. The blending amount of the fly ash is generally less than or equal to 75 percent. The main advantages are: according to the main properties of the fly ash, the formula, the roasting temperature and the roasting time are adjusted, so that the ultra-light ceramsite can be produced, and the ordinary ceramsite or the high-strength ceramsite can also be produced, and the method is suitable for annual production of 2-10 ten thousand m3The production line of (1); its disadvantages are high energy consumption, high cost and high investment. (2) Sintering machine method. The mixing amount of the fly ash is up to 80 percent. The main advantages are: the fly ash has no special requirements, medium, coarse and fine ash or dry, wet and semi-dry ash can be used, and the bulk density of the ceramsite is 630-750 Kg/m3The cylinder pressure strength is 4 MPa-6 MPa, the production heat consumption is lower, and the cost is 10% -20% lower than that of a rotary kiln method. The disadvantages are that: the power consumption is slightly high, the investment is more, and the method is suitable for annual production of 7-20 ten thousand meters3The production line of (1). The gangue ceramsite is prepared by utilizing tailings, and the tailing powder comprises the following components: coal gangue = 50: 50, the bulk density of the produced ceramsite can reach 365-727 kg/m3. The document shows that waste materials, as well as haydites, can be produced in a rotary kiln.
The bulk density of 661 Kg/m bulk density is tried out by a test type rotary kiln after being developed and used by the Zhou municipal stone material factory3(coal gangue: shale = 70: 30) and bulk density 667 Kg/m3(coal gangue: calcium-sodium waste residue of ore dressing pharmaceutical factory = 90: 10). After homogenizing, grinding and balling the spontaneous combustion coal gangue, directly roasting the spontaneous combustion coal gangue to obtain the bulk density of 400-450 Kg/m3The ultra-light ceramsite.
The document, namely the research on the preparation of the high-strength shale ceramsite and the performance of the concrete thereof, utilizes shale resources in Chongqing areas and is suitable for roastingThe raw material formula of the high-strength ceramsite, the roasting process parameters of the high-strength ceramsite and the influence of auxiliary raw materials on the roasting system of the ceramsite are researched, and the water absorption characteristic of the obtained high-strength ceramsite and the basic mechanical property of concrete are researched. The research result shows that: the Chongqing Jiangjin shale and the Yunyang Fuxing shale are both suitable for producing the high-strength shale ceramsite. Secondly, the intensity of the ceramsite can be improved by adopting a mode of preheating for a long time (the preheating time is prolonged to 15-20 min) and selecting low-temperature quick firing during the firing, and the firing time is shortened to 10-15 min. Thirdly, 5 to 15 percent of fly ash is doped into the shale to reduce the expansion temperature of the shale ceramsite and improve the strength of the ceramsite, but a proper roasting system is selected according to the doping amount of the fly ash. Fourthly, the shale ceramsite produced by the Yunyang Fuxing shale meets the high-strength shale ceramsite required by the lightweight aggregate and the test method thereof GB/T17431.1: bulk density is 830 Kg/m3The cylinder pressure strength can reach 8.1 MPa, and the water absorption rate is 4.8% in 1 hour under normal pressure.
The field is provided with research on producing various ceramsite by using a mudstone production line, spherical high-strength ceramsite and common high-strength ceramsite are successfully produced by using mudstone on one production line, and the loose density of the spherical high-strength ceramsite is 749 Kg/m3The cylinder pressure strength is 7.7 MPa, and the strength label is 25 MPa; the loose density of the common high-strength ceramsite is 1080 Kg/m3The barrel pressure strength was 12.1 MPa, and the strength was designated 35 MPa. The apparent densities of the developed high-strength ceramsite for different purposes are respectively 1500 Kg/m, 1800 Kg/m and 2000 Kg/m3The 28 d strength of the light high-strength ceramsite concrete reaches 38, 5l and 79 MPa respectively, wherein the best concrete mixing proportion strength can reach 30.1.
The research on the preparation of ceramsite lightweight aggregate by sludge and the thermodynamic characteristics thereof is carried out in any way, and the optimal blank mix proportion dry basis (wt%) obtained by experiments is as follows: sludge/fly ash/river sediment = 25%: 15%: 60%, the optimized technological parameters are respectively as follows: preheating at 350 ℃, roasting at 1190 ℃ and keeping the temperature for lmin; and carrying out the amplification experimental study of the fired sludge ceramsite according to the blank mixture ratio and the optimal process parameters to obtain the ceramsite product which is light brown in appearance, mellow and smooth and relatively uniform in particle size. The main building material quality and the leaching toxicity of the ceramsite are tested, and the result shows that the ceramsite product can be used as a building material and meets the requirement of environmental safety; the standard sample of the ceramsite concrete strength grade LC30 concrete is prepared in an experiment, and the compressive strength of the ceramsite concrete after being cured for 28 days in a standard curing chamber with the room temperature of 20 ℃ and the relative humidity of more than 95 percent is 30MPa, thereby meeting the requirement of the ceramsite concrete with the strength grade LC 30.
The results of the above documents find that no relevant patent is available for producing ceramsite by using a large-scale pellet rotary kiln, so that the ceramsite product required by building heat preservation and urban construction can be produced in large industry and large batch.
The appearance of the ceramsite produced by using the iron ore tailings after being soaked in water has rust, and through composition analysis of a solution dried substance, a large amount of sulfate ions exist in the sintered ceramsite in a soluble substance form, so that the application of the ceramsite is limited due to the corrosion of the acid radicals. The waste residue resources such as steel slag and the like are adopted, the ceramsite is produced by taking the hard clay, the iron ore tailings and the steel slag as main materials, and sulfate ions in the iron tailings are absorbed by calcium oxide and magnesium oxide in the steel slag to neutralize the pH value of the sulfate ions, so that the water-soluble effect of the sulfate ions in the ceramsite is avoided, and rust is generated. The application range of the ceramic particles after the stabilization treatment is enlarged.
Disclosure of Invention
The invention aims at the characteristics of iron ore tailings containing silicon oxide, calcium oxide, magnesium oxide, iron oxide, a small amount of potassium and sodium and a large amount of sulfide and is utilized. The method is characterized in that hard clay ore is mainly used, the content of tailings is properly reduced, the alkalinity of the tailings is adjusted by steel slag to balance the problems of treatment and stability of sulfides in the tailings, and a matched process route is selected to prepare the tailing with the bulk density of 1.70-2.10 g/cm3And the compression strength is 3-9 KN.
The measures for realizing the aim are as follows:
an anti-corrosion iron ore tailing ceramsite comprises the following raw materials in percentage by weight: hard clay with the particle size less than or equal to 0.088 mm: 28-50%, and converter steel slag with the granularity less than or equal to 0.088 mm: 10-40%, and iron ore tailings with the particle size of less than or equal to 0.088 mm: 5-45%, bentonite with the particle size less than or equal to 0.088 mm: 5E &10 percent of waste plastic powder with the granularity less than or equal to 0.1 mm: 0.05-3%, and municipal sludge: 1-5%; the performance of the ceramsite is as follows: the bulk density is 1.70-2.10 g/cm3And the compressive strength is 3-9 KN.
Preferably: the weight percentage content of the hard clay with the granularity less than or equal to 0.088mm is 28-35%.
Further: the water content of the municipal sludge is not more than 2 percent by weight.
Further: the weight percentage content of the iron ore tailings with the granularity of less than or equal to 0.088mm is 15-45%.
The method for preparing the rust-resistant economical iron ore tailing ceramsite comprises the following steps:
1) firstly, uniformly mixing all materials;
2) placing the mixed mixture into a cylindrical pelletizer or a disc pelletizer, and spraying water to the mixture according to the amount of 8-15% of the total weight percentage of the raw materials until the mixture is wet; manufacturing a green ball;
3) drying the produced green pellets, wherein the drying temperature is controlled to be 90-110 ℃, and the drying time is 10-30 min;
4) preheating at 600-900 ℃ for 15-30 min;
5) roasting at 1020-1250 ℃ for 15-25 min;
6) naturally cooling to room temperature for later use.
Preferably: the drying temperature is controlled to be 95-105 ℃.
Preferably: the preheating temperature is 660-880 ℃.
Preferably: the roasting temperature is 1050-1210 ℃.
Effect of the raw materials in the present invention
Hard clay with the particle size less than or equal to 0.088 mm: is used as the main component of ceramsite, and can raise its fire-resisting property and expand its firing range.
Converter steel slag with the granularity less than or equal to 0.088 mm: calcium oxide and magnesium oxide are provided, and sulfate radicals are neutralized to form calcium sulfate and calcium sulfide.
Iron ore tailings with the particle size less than or equal to 0.088 mm: is used as the main component of the ceramsite and reduces the firing temperature.
Bentonite with the granularity less than or equal to 0.088 mm: used as the binding component of the ceramsite, improves the refractoriness of the ceramsite and is beneficial to pelletizing.
Waste plastic powder with granularity less than or equal to 0.1 mm: the pore-forming agent is used for ceramsite and is beneficial to urban waste treatment.
Urban sludge: the filler is used for the common filler of the ceramsite, and is beneficial to the treatment of urban waste.
Compared with the prior art, the technical measures of manufacturing the ceramsite by using the tailings and the steel slag can utilize secondary resources to the maximum extent, change waste into valuable, utilize 500 ten thousand tons of pellet production lines, and produce the ceramsite with the large-scale low-cost production volume density of 1.70-2.10 g/cm3And the cost of the ceramsite product with the compressive strength of 3-9 KN per ton of ceramsite can be reduced by not less than 10%.
Detailed Description
The present invention is described in detail below:
example 1
An anti-corrosion iron ore tailing ceramsite comprises the following raw materials in percentage by weight: hard clay with the particle size less than or equal to 0.088 mm: 30 percent of converter steel slag with the granularity less than or equal to 0.088 mm: 40 percent of iron ore tailings with the granularity less than or equal to 0.088 mm: 18 percent of bentonite with the granularity less than or equal to 0.088 mm: 10 percent of waste plastic powder with the granularity less than or equal to 0.1 mm: 3% and municipal sludge with a water content of 1%: 1 percent of
The preparation method comprises the following steps:
1) firstly, uniformly mixing all materials;
2) placing the mixed mixture into a cylindrical pelletizer or a disc pelletizer, and spraying water to the mixture according to the amount of 8 percent of the total weight percentage of the raw materials until the mixture is wet; manufacturing a green ball;
3) drying the produced green ball, wherein the drying temperature is controlled at 110 ℃, and the drying time is 15 min;
4) preheating at 600-620 ℃ for 15 min;
5) roasting at 1080 deg.c for 15 min;
6) naturally cooling to room temperature for later use.
Through detection, the preparationThe volume density of the ceramsite is 1.72g/cm3The compressive strength is 4.5 KN; during the trial period, the corrosion phenomenon is not found and occurs; the cost is reduced by 25 percent compared with the prior art.
Example 2:
an anti-corrosion iron ore tailing ceramsite comprises the following raw materials in percentage by weight: hard clay with the particle size less than or equal to 0.088 mm: 50 percent of converter steel slag with the granularity less than or equal to 0.088 mm: 10 percent of iron ore tailings with the granularity less than or equal to 0.088 mm: 33.45 percent of bentonite with the granularity less than or equal to 0.088 mm: 5 percent of waste plastic powder with the granularity less than or equal to 0.1 mm: 0.05%, municipal sludge with a water content of 1.4%: 1.5 percent
The preparation method comprises the following steps:
1) firstly, uniformly mixing all materials;
2) placing the mixed mixture into a cylindrical pelletizer or a disc pelletizer, and spraying water to the mixture according to the amount of 12 percent of the total weight percentage of the raw materials until the mixture is wet; manufacturing a green ball;
3) drying the produced green ball at 91 deg.C for 30 min;
4) preheating at 660-680 ℃ for 20 min;
5) roasting at 1150 deg.c for 20 min;
6) naturally cooling to room temperature for later use.
The volume density of the prepared ceramsite is 2.05g/cm through detection3The compressive strength is 7.5 KN; during the trial period, no rusting phenomenon is found and occurs.
Example 3:
an anti-corrosion iron ore tailing ceramsite comprises the following raw materials in percentage by weight: hard clay with the particle size less than or equal to 0.088 mm: 32 percent of converter steel slag with the granularity less than or equal to 0.088 mm: 12 percent of iron ore tailings with the granularity less than or equal to 0.088 mm: 45 percent of bentonite with the granularity less than or equal to 0.088 mm: 6 percent of waste plastic powder with the granularity less than or equal to 0.1 mm: 2%, municipal sludge with a water content of 1.55%: 2 percent of
The preparation method comprises the following steps:
1) firstly, uniformly mixing all materials;
2) placing the mixed mixture into a cylindrical pelletizer or a disc pelletizer, and spraying water to the mixture according to the amount of 13 percent of the total weight percentage of the raw materials until the mixture is wet; manufacturing a green ball;
3) drying the produced green ball at 96 deg.C for 28 min;
4) preheating at 780-800 ℃ for 26 min;
5) roasting at 1050 ℃ for 18 min;
6) naturally cooling to room temperature for later use.
The volume density of the prepared ceramsite is 1.76g/cm through detection3The compressive strength is 3.5 KN; during the trial period, no rusting phenomenon is found and occurs.
Example 4:
an anti-corrosion iron ore tailing ceramsite comprises the following raw materials in percentage by weight: hard clay with the particle size less than or equal to 0.088 mm: 48 percent of converter steel slag with the granularity less than or equal to 0.088 mm: 28.5 percent of iron ore tailings with the granularity less than or equal to 0.088 mm: 6 percent of bentonite with the granularity less than or equal to 0.088 mm: 10 percent of waste plastic powder with the granularity less than or equal to 0.1 mm: 2.5%, municipal sludge with a water content of 1.6%: 5 percent of
The preparation method comprises the following steps:
1) firstly, uniformly mixing all materials;
2) placing the mixed mixture into a cylindrical pelletizer or a disc pelletizer, and spraying water on the mixture according to the amount of 14 percent of the total weight percentage of the raw materials until the mixture is wet; manufacturing a green ball;
3) drying the produced green ball at 105 deg.C for 13 min;
4) preheating at 730-750 ℃ for 25 min;
5) roasting at 1190 deg.c for 21 min;
6) naturally cooling to room temperature for later use.
The volume density of the prepared ceramsite is 1.92g/cm through detection3The compressive strength is 6.9 KN; in the trial periodMeanwhile, no occurrence of rust was observed and occurred.
Example 5
An anti-corrosion iron ore tailing ceramsite comprises the following raw materials in percentage by weight: hard clay with the particle size less than or equal to 0.088 mm: 40 percent of converter steel slag with the granularity less than or equal to 0.088 mm: 30 percent of iron ore tailings with the granularity less than or equal to 0.088 mm: 30 percent of bentonite with the granularity less than or equal to 0.088 mm: 6.5 percent of waste plastic powder with the granularity less than or equal to 0.1 mm: 1.5%, municipal sludge with a water content of 1.2%: 2 percent.
The preparation method comprises the following steps:
1) firstly, uniformly mixing all materials;
2) placing the mixed mixture into a cylindrical pelletizer or a disc pelletizer, and spraying water on the mixture according to the amount of 15 percent of the total weight percentage of the raw materials until the mixture is wet; manufacturing a green ball;
3) drying the produced green ball at 100 deg.C for 12 min;
4) preheating at 790-810 ℃ for 18 min;
5) roasting at 1250 ℃ for 16 min;
6) naturally cooling to room temperature for later use.
The volume density of the prepared ceramsite is 1.8g/cm through detection3The compressive strength is 8.2 KN; during the trial period, no rusting phenomenon is found and occurs.
Example 6:
an anti-corrosion iron ore tailing ceramsite comprises the following raw materials in percentage by weight: hard clay with the particle size less than or equal to 0.088 mm: 39 percent of converter steel slag with the granularity less than or equal to 0.088 mm: 26.1 percent of iron ore tailings with the granularity less than or equal to 0.088 mm: 22 percent, bentonite with the granularity less than or equal to 0.088 mm: 7 percent of waste plastic powder with the granularity less than or equal to 0.1 mm: 1.9%, municipal sludge with a water content of 1.6%: 4 percent.
The preparation method comprises the following steps:
1) firstly, uniformly mixing all materials;
2) placing the mixed mixture into a cylindrical pelletizer or a disc pelletizer, and spraying water to the mixture according to the amount of 11% of the total weight percentage of the raw materials until the mixture is wet; manufacturing a green ball;
3) drying the produced green ball at 103 deg.C for 25 min;
4) preheating at 880-900 ℃ for 20 min;
5) roasting at 1090 deg.c for 17 min;
6) naturally cooling to room temperature for later use.
The volume density of the prepared ceramsite is 1.78g/cm through detection3The compressive strength is 6.2 KN; during the trial period, no rusting phenomenon is found and occurs.
The present embodiments are merely preferred examples, and are not intended to limit the scope of the present invention.

Claims (4)

1. An anti-corrosion iron ore tailing ceramsite comprises the following raw materials in percentage by weight: hard clay with the particle size less than or equal to 0.088 mm: 28-50%, and converter steel slag with the granularity less than or equal to 0.088 mm: 10-12% or converter slag: 26.1-40%, iron ore tailings with the granularity less than or equal to 0.088 mm: 5-45%, bentonite with the particle size less than or equal to 0.088 mm: 5-10%, waste plastic powder with granularity less than or equal to 0.1 mm: 0.05-3%, and municipal sludge: 1-5%; the performance of the ceramsite is as follows: the bulk density is 1.70-2.10 g/cm3The compressive strength is 3-9 KN;
the preparation method comprises the following steps:
1) firstly, uniformly mixing all materials;
2) placing the mixed mixture into a cylindrical pelletizer or a disc pelletizer, and spraying water to the mixture according to the amount of 8-15% of the total weight percentage of the raw materials until the mixture is wet; manufacturing a green ball;
3) drying the produced green pellets, wherein the drying temperature is controlled to be 90-110 ℃, and the drying time is 10-30 min;
4) preheating at 600-900 ℃ for 18-30 min;
5) roasting at 1190-1250 ℃ for 16-25 min;
6) naturally cooling to room temperature for later use.
2. The anti-rust iron ore tailing ceramsite according to claim 1, which is characterized in that: the weight percentage content of the hard clay with the granularity less than or equal to 0.088mm is 28-35%.
3. The anti-rust iron ore tailing ceramsite according to claim 1, which is characterized in that: the water content of the municipal sludge is not more than 2 percent by weight.
4. The anti-rust iron ore tailing ceramsite according to claim 1, which is characterized in that: the weight percentage content of the iron ore tailings with the granularity of less than or equal to 0.088mm is 15-45%.
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