CN113200756A - Method for preparing regeneration raw material from used cement kiln alkaline bricks - Google Patents
Method for preparing regeneration raw material from used cement kiln alkaline bricks Download PDFInfo
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- CN113200756A CN113200756A CN202110448350.4A CN202110448350A CN113200756A CN 113200756 A CN113200756 A CN 113200756A CN 202110448350 A CN202110448350 A CN 202110448350A CN 113200756 A CN113200756 A CN 113200756A
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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
- C04B35/00—Shaped ceramic products characterised by their composition; Ceramics compositions; Processing powders of inorganic compounds preparatory to the manufacturing of ceramic products
- C04B35/66—Monolithic refractories or refractory mortars, including those whether or not containing clay
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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
- 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
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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
- 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
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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
- C04B2235/00—Aspects relating to ceramic starting mixtures or sintered ceramic products
- C04B2235/70—Aspects relating to sintered or melt-casted ceramic products
- C04B2235/95—Products characterised by their size, e.g. microceramics
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- 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
A method for preparing a regeneration raw material by using an alkaline brick of a post-cement kiln, belonging to the technical field of building material high-temperature refractory materials. The method comprises the following specific steps: forcibly pretreating the used cement kiln alkaline bricks; crushing the sorted used cement kiln alkaline bricks into particles with the particle size of less than or equal to 3 mm; homogenizing the crushed particles; continuously adding the homogenized material into a hulling furnace, smelting at a high temperature of more than 2000 ℃, naturally cooling for more than 120 hours after stopping the furnace, sorting the material lumps according to grades, crushing, grading according to granularity, storing in a classified manner, and using as required. The method has the advantages that harmful impurity components such as alkali, chlorine, sulfur and the like in the used brick can be effectively removed, and a foundation is provided for the recycling of the used alkaline brick; low cost and high resource utilization rate.
Description
Technical Field
The invention belongs to the technical field of high-temperature refractory materials for building materials, and particularly relates to a method for preparing a regeneration raw material from an alkaline brick of a used cement kiln.
Background
The refractory material is an indispensable auxiliary material in high-temperature industry, and is widely applied to high-temperature equipment in industrial operation such as cement, steel, electric power, petrochemical industry, waste incineration and the like. Along with the improvement of the high-temperature industrial yield of China, the using amount of the refractory materials is also increased year by year, the using amount of the refractory materials in China exceeds 2000 million tons in 2018 by statistics, the consumption of natural resources is accelerated by the aid of the continuously increased refractory materials, and meanwhile, a large amount of refractory material high-temperature waste is generated. China is a large world cement production country, and 1600 cement kilns are counted incompletely. While continuously providing cement products for national economic development, the cement kilns consume a large amount of refractory materials all the time, when the refractory materials are used to a certain extent and cannot meet the requirement of continuous production, corresponding new materials must be replaced, and the cement kiln with the yield of 5000 tons/day is taken as an example, the alkaline bricks of the used cement kiln, which are only removed by once overhaul, exceed 200 tons. If these used cement kiln bricks are not properly disposed of, they will have a bad influence on the environment, especially on the soil and water. Meanwhile, as the magnesia resource is continuously reduced, the price of the magnesia raw material is continuously increased, if the used cement kiln alkaline bricks can be recycled, the environmental problem can be solved, the consumption of a large amount of natural resources can be reduced, the cost of refractory materials is reduced, and the manufacturing cost of the whole industrial chain is reduced. However, the recycling of the used cement kiln alkaline bricks has no mature technology at present, and the treatment of the used cement kiln bricks is an unavoidable problem along with the increase of the supervision of solid wastes in China.
The reason why the used cement kiln alkaline bricks cannot be directly reused is that a large amount of impurities containing elements such as alkali, chlorine, sulfur and the like which are circularly enriched in the use process of the cement kiln bricks are deposited inside the used cement kiln bricks, and the total amount of the impurities accounts for 5-15%. The impurity components are soluble salts at normal temperature, can be dissolved out from used bricks to cause extremely adverse effects on the construction performance and the environment of the refractory materials, and are low-melting point or volatile salts at high temperature, so that the refractory materials can generate alkali cracking reaction to cause structural damage. Therefore, the premise of recycling the used cement kiln alkaline bricks is to effectively remove harmful impurities such as alkali, chlorine, sulfur and the like.
Disclosure of Invention
The invention aims to provide a method for preparing a regeneration raw material by using an alkaline brick of a used cement kiln, which solves the problem that the alkaline brick of the used cement kiln cannot be efficiently utilized. The harmful impurities in the used cement kiln bricks are removed, and the generation of uniform and stable composite phase raw materials in the recycled bricks is promoted.
A method for preparing a regeneration raw material by using an alkaline brick of a post-cement kiln comprises the following specific steps and parameters:
1) forcibly pretreating the used cement kiln alkaline bricks, removing other substances except the alkaline bricks, and drying the bricks until the water content is less than or equal to 0.8 percent according to the requirement;
2) crushing the sorted used cement kiln alkaline bricks into particles with the particle size of less than or equal to 3 mm;
3) carrying out three times of flatly spreading, directly taking and gravity mixing operations on the crushed particles to finish homogenization treatment;
4) continuously adding the homogenized material into a hulling furnace, and smelting at a high temperature of more than 2000 ℃ to remove harmful impurity components and fully react useful components in the material;
5) naturally cooling for more than 120 hours after stopping the furnace, removing the shell, and disassembling the smelted material lump to be less than or equal to 30 cm;
6) sorting the material lumps according to grades, crushing, grading according to granularity, storing in a classified mode and using as required.
The used cement kiln alkaline bricks are high-temperature wastes left after the alkaline refractory bricks built on different parts of the inner wall of the high-temperature section of the rotary cement kiln are used. The used cement kiln alkaline bricks comprise one or more of periclase spinel bricks, magnesium composite spinel bricks, magnesium aluminate spinel bricks and the like. After the used cement kiln alkaline brick is used, harmful components such as alkali, chlorine, sulfur and the like with the mass fraction of 5-15% are circularly enriched, and the enriched harmful components are soluble salts at normal temperature and volatile gases at high temperature.
The specific operation of the step 1) is as follows: firstly, picking out non-alkaline bricks in alkaline bricks of a used cement kiln through mechanical or manual sorting, wherein 100% of cement clinker is required to be removed if the head of the used bricks are adhered with the cement clinker, and the adhered iron plates are required to be removed if the surfaces of the used bricks are adhered with the iron plates, and drying the used bricks until the water content is less than or equal to 0.8% if the used bricks are wet.
The detailed operation of the step 4) is as follows: paving the bottom of the ground particles by 40cm high, descending the electrodes, contacting and slightly probing into the bedding material, scattering the crushed electrode material to connect the three electrodes, and then adding the particle material with the height of 30-40 cm; then, opening the furnace for arc starting, adjusting the voltage at 90-120V, adjusting the current to match with the lifting electrode, and keeping the arc between the electrodes not to be extinguished until the current is stable; then, switching to an automatic mode, automatically lifting the electrode, automatically distributing the material if open fire occurs, and keeping the voltage at 100-150V and the current at 8-10 KA during the period; and cutting off the power supply when the distance between the materials and the furnace mouth is 30cm, feeding materials to press open fire, slowly lifting the electrode, filling the materials, and finishing high-temperature smelting.
The produced materials comprise recovered materials and regenerated raw materials. The regeneration raw material comprises superior products and sand. After the recovered materials are collected, the recovered materials are equal to the pretreated used cement kiln basic bricks, and the next period of production directly enters the step 2); the mass fraction of soluble harmful components enriched in the sand is reduced to be below 0.20 percent, and the soluble harmful components can be used as a substitute raw material of magnesia sand, and can also enter the step 2) again in the next period; the main mineral phases of the superior product are uniformly distributed periclase and spinel phases, the mass fraction of soluble harmful components is less than 0.10%, and the volume density is 3.40g/cm3The method has the advantages of no moisture in drying and good roundness, and can be used as a substitute raw material for producing high-purity magnesia for high-grade refractory materials.
The invention has the advantages that:
1. the method can effectively remove harmful impurity components such as alkali, chlorine, sulfur and the like in the used brick, and provides a foundation for the recycling of the used alkaline brick;
2. in the method, magnesia, spinel and/or alumina powder in wastes in the electric melting process fully reflect the generated periclase-spinel complex phase raw material, so that the quality of the regenerated raw material is improved, and the waste is changed into valuable;
3. the method has low cost and high resource utilization rate, the utilization rate of the alkaline bricks of the cement kiln can be nearly 100 percent after the alkaline bricks are used, and the cost of the produced superior products is reduced by more than 20 percent compared with the cost of substitute products;
4. the method is clean and environment-friendly, no harmful components are discharged in the whole process, and harmful impurities separated at high temperature can be recycled in dust removal through adjusting the temperature of the flue gas, so that the resource utilization is realized.
Detailed Description
Example 1
A process method for preparing a regeneration raw material by using an alkaline brick of a post-cement kiln comprises the following specific steps and parameters:
1) forcedly sorting 200 tons of recycled used cement kiln alkaline bricks, picking out non-alkaline bricks, removing 100% of cement clinker and iron sheet at the head of the residual bricks, and detecting that the water content of the used bricks is 0.5%;
2) sequentially feeding the sorted used cement kiln basic bricks into a jaw crusher and a double-roll crusher to crush the bricks into 0-1mm particles;
3) taking the crushed particles by tiling and mixing the particles by gravity, and repeating the process for three times to complete homogenization treatment;
4) paving the bottom with the crushed particles for 40cm, descending the electrode, slightly probing into the bedding material, scattering the crushed electrode material, and then adding the particle material with the height of 30 cm; then, adjusting the voltage to 90V, opening the furnace for arcing, adjusting the current to match with the lifting electrode, and keeping the arc not to be extinguished until the current is stable; then, switching to an automatic mode, automatically lifting the electrode, automatically distributing materials when open fire occurs, and keeping the voltage at 150V and the current at 10 KA; cutting off the power supply when the distance between the materials and the furnace mouth is 30cm, feeding materials to press open fire, slowly lifting the electrode, and filling the materials;
5) naturally cooling for 120 hours, removing shells, and disassembling the smelted material lumps to 0-30 cm;
6) the material lumps are manually classified into superior products, skin sand and bottom and peripheral recycled materials. The recovered materials are returned to the alkaline brick pile of the used cement kiln. Respectively crushing the high-quality product and the sand, sieving and grading into 0-1mm, 1-3mm and 3-5mm, and packaging and storing in a sealed manner.
The main mineral phases of the obtained superior product are uniformly distributed periclase and spinel phases, the mass fraction of soluble harmful components is 0.08%, and the volume density is 3.42g/cm3(ii) a The mass fraction of soluble harmful components of the sand leather is 0.16 percent, the sand leather can be used in low-grade refractory materials, and high-grade products can replace high-purity magnesia to be used in high-grade refractory materials.
Example 2
A process method for preparing a regeneration raw material by using an alkaline brick of a post-cement kiln comprises the following specific steps and parameters:
1) forcibly sorting 100 tons of recycled used cement kiln basic bricks, picking out non-basic bricks, removing 100% of cement clinker and iron sheet at the head of the residual bricks, detecting that the water content of the used bricks is 1.5%, and then drying the used bricks in the sun until the water content is 0.8%;
2) sequentially feeding the sorted used cement kiln basic bricks into a jaw crusher and a double-roll crusher to crush the bricks into 0-3 mm particles;
3) taking the crushed particles by tiling and mixing the particles by gravity, and repeating the process for three times to complete homogenization treatment;
4) paving the bottom with the crushed particles for 40cm, descending the electrode, slightly probing into the bedding material, scattering the crushed electrode material, and then adding the particle material with the height of 30 cm; then, adjusting the voltage to 90V, opening the furnace for arcing, adjusting the current to match with the lifting electrode, and keeping the arc not to be extinguished until the current is stable; then, switching to an automatic mode, automatically lifting the electrode, automatically distributing materials when open fire occurs, and keeping the voltage at 100V and the current at 10 KA; cutting off the power supply when the distance between the materials and the furnace mouth is 30cm, feeding materials to press open fire, slowly lifting the electrode, and filling the materials;
5) naturally cooling for 120 hours, removing shells, and disassembling the smelted material lumps to 0-20 cm;
6) the material lumps are manually classified into superior products, skin sand and bottom and peripheral recycled materials. The recovered materials and the sand are returned to the alkaline brick pile of the used cement kiln. Crushing, sieving, classifying into 0-1mm, 1-3mm, and 3-5mm, packaging, and storing under sealed condition.
The obtained mineral phase of high-quality product is uniformly distributed periclase and spinel phase, and has soluble harmful component mass fraction of 0.07% and volume density of 3.45g/cm3The magnesia brick can replace part of high-purity magnesium in the production of periclase spinel bricks.
Example 3
A process method for preparing a regeneration raw material by using an alkaline brick of a post-cement kiln comprises the following specific steps and parameters:
1) forcibly sorting 100 tons of recycled used cement kiln magnesium composite spinel bricks, picking out other bricks, removing 100% of cement clinker and iron sheet at the head of the residual brick, and detecting that the water content of the used bricks is 0.8%;
2) sequentially feeding the sorted used cement kiln basic bricks into a jaw crusher and a double-roll crusher to crush the bricks into 0-3 mm particles;
3) taking the crushed particles by tiling and mixing the particles by gravity, and repeating the process for three times to complete homogenization treatment;
4) paving the bottom with the crushed particles for 40cm, descending the electrode, slightly probing into the bedding material, scattering the crushed electrode material, and then adding the particle material with the height of 30 cm; then, adjusting the voltage to 90V, opening the furnace for arcing, adjusting the current to match with the lifting electrode, and keeping the arc not to be extinguished until the current is stable; then, switching to an automatic mode, automatically lifting the electrode, automatically distributing materials when open fire occurs, and keeping the voltage at 100V and the current at 10 KA; cutting off the power supply when the distance between the materials and the furnace mouth is 30cm, feeding materials to press open fire, slowly lifting the electrode, and filling the materials;
5) naturally cooling for 120 hours, removing shells, and disassembling the smelted material lumps to 0-30 cm;
6) the material lumps are manually classified into superior products, skin sand and bottom and peripheral recycled materials. The recovered materials are returned to the alkaline brick pile of the used cement kiln. Respectively crushing the high-quality product and the sand, sieving and grading into 0-1mm, 1-3mm and 3-5mm, and packaging and storing in a sealed manner.
The main mineral phases of the obtained superior products are uniformly distributed periclase and spinel phases, the mass fraction of soluble harmful components is 0.06%,Bulk density 3.40g/cm3(ii) a The mass fraction of soluble harmful components in the skin sand is 0.14%, the skin sand can be used as a substitute raw material for producing a novel heat storage brick magnesia raw material, and high-grade products can be used in high-grade refractory materials instead of high-purity magnesia.
Claims (3)
1. A method for preparing a regeneration raw material by using an alkaline brick of a post-cement kiln is characterized by comprising the following specific steps and parameters:
1) forcibly pretreating the used cement kiln alkaline bricks, removing other substances except the alkaline bricks, and drying the bricks until the water content is less than or equal to 0.8 percent according to the requirement;
2) crushing the sorted used cement kiln alkaline bricks into particles with the particle size of less than or equal to 3 mm;
3) carrying out three times of flatly spreading, directly taking and gravity mixing operations on the crushed particles to finish homogenization treatment;
4) continuously adding the homogenized material into a hulling furnace, and smelting at a high temperature of more than 2000 ℃ to remove harmful impurity components and fully react useful components in the material;
5) naturally cooling for more than 120 hours after stopping the furnace, removing the shell, and disassembling the smelted material lump to be less than or equal to 30 cm;
6) sorting the material lumps according to grades, crushing, grading according to granularity, storing in a classified mode and using as required.
2. The method according to claim 1, wherein the forced preprocessing of step 1) is: the non-alkaline bricks in the used cement kiln alkaline bricks are picked up by mechanical or manual sorting, the cement clinker is removed by 100 percent when the head of the used bricks are adhered with the cement clinker, and the adhered iron plates of the iron plates are adhered on the surfaces of the used bricks.
3. The method of claim 1, wherein the high temperature smelting of step 4) is: paving the bottom of the ground particles by 40cm high, descending the electrodes, contacting and slightly probing into the bedding material, scattering the crushed electrode material to connect the three electrodes, and then adding the particle material with the height of 30-40 cm; then, opening the furnace for arc starting, adjusting the voltage at 90-120V, adjusting the current to match with the lifting electrode, and keeping the arc between the electrodes not to be extinguished until the current is stable; then, switching to an automatic mode, automatically lifting the electrode, automatically distributing the material when open fire occurs, and keeping the voltage at 100-150V and the current at 8-10 KA; and cutting off the power supply when the distance between the materials and the furnace mouth is 30cm, feeding materials to press open fire, slowly lifting the electrode, filling the materials, and finishing high-temperature smelting.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003001218A (en) * | 2001-06-21 | 2003-01-07 | Taiheiyo Cement Corp | Method for treating waste having high chlorine and lead contents |
| CN1772681A (en) * | 2005-09-22 | 2006-05-17 | 郑州振东耐磨材料有限公司 | Waste magnesia carbon brick regenerating and utilizing process |
| CN1865189A (en) * | 2006-04-27 | 2006-11-22 | 武汉科技大学 | Method for preparing electro-fused magnesia alumina spinel |
| CN104761265A (en) * | 2015-03-16 | 2015-07-08 | 通达耐火技术股份有限公司 | Secondary SiC/mullite brick recycle pre-treatment process |
| CN105859307A (en) * | 2016-03-30 | 2016-08-17 | 重庆钢铁(集团)有限责任公司 | Method for processing and recovering carboniferous waste fireproof materials |
| CN110002849A (en) * | 2019-04-28 | 2019-07-12 | 福建省德化县盛鼎瓷艺有限公司 | A kind of preparation method preparing high-performance abrasion-proof domestic ceramics using waste old ceramics |
-
2021
- 2021-04-25 CN CN202110448350.4A patent/CN113200756B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003001218A (en) * | 2001-06-21 | 2003-01-07 | Taiheiyo Cement Corp | Method for treating waste having high chlorine and lead contents |
| CN1772681A (en) * | 2005-09-22 | 2006-05-17 | 郑州振东耐磨材料有限公司 | Waste magnesia carbon brick regenerating and utilizing process |
| CN1865189A (en) * | 2006-04-27 | 2006-11-22 | 武汉科技大学 | Method for preparing electro-fused magnesia alumina spinel |
| CN104761265A (en) * | 2015-03-16 | 2015-07-08 | 通达耐火技术股份有限公司 | Secondary SiC/mullite brick recycle pre-treatment process |
| CN105859307A (en) * | 2016-03-30 | 2016-08-17 | 重庆钢铁(集团)有限责任公司 | Method for processing and recovering carboniferous waste fireproof materials |
| CN110002849A (en) * | 2019-04-28 | 2019-07-12 | 福建省德化县盛鼎瓷艺有限公司 | A kind of preparation method preparing high-performance abrasion-proof domestic ceramics using waste old ceramics |
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