WO2021142624A1 - Method for centrifugally casting composite steel pipe by means of slag - Google Patents

Method for centrifugally casting composite steel pipe by means of slag Download PDF

Info

Publication number
WO2021142624A1
WO2021142624A1 PCT/CN2020/072040 CN2020072040W WO2021142624A1 WO 2021142624 A1 WO2021142624 A1 WO 2021142624A1 CN 2020072040 W CN2020072040 W CN 2020072040W WO 2021142624 A1 WO2021142624 A1 WO 2021142624A1
Authority
WO
WIPO (PCT)
Prior art keywords
slag
steel pipe
glass
steel
molten
Prior art date
Application number
PCT/CN2020/072040
Other languages
French (fr)
Chinese (zh)
Inventor
席文君
王保勤
张智应
Original Assignee
泰安特夫德新材料科技有限公司
山西中阳钢铁有限公司
席文君
王保勤
张智应
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 泰安特夫德新材料科技有限公司, 山西中阳钢铁有限公司, 席文君, 王保勤, 张智应 filed Critical 泰安特夫德新材料科技有限公司
Priority to CN202080025828.6A priority Critical patent/CN114126783B/en
Priority to PCT/CN2020/072040 priority patent/WO2021142624A1/en
Publication of WO2021142624A1 publication Critical patent/WO2021142624A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D13/00—Centrifugal casting; Casting by using centrifugal force
    • B22D13/02—Centrifugal casting; Casting by using centrifugal force of elongated solid or hollow bodies, e.g. pipes, in moulds rotating around their longitudinal axis
    • C—CHEMISTRY; METALLURGY
    • C03—GLASS; MINERAL OR SLAG WOOL
    • C03C—CHEMICAL COMPOSITION OF GLASSES, GLAZES OR VITREOUS ENAMELS; SURFACE TREATMENT OF GLASS; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS, MINERALS OR SLAGS; JOINING GLASS TO GLASS OR OTHER MATERIALS
    • C03C10/00—Devitrified glass ceramics, i.e. glass ceramics having a crystalline phase dispersed in a glassy phase and constituting at least 50% by weight of the total composition

Definitions

  • the invention relates to a method for centrifugal casting of composite steel pipes by using slag.
  • the slag includes one selected from blast furnace slag and steel slag.
  • the solid waste in the iron and steel industry is mainly composed of blast furnace slag or steel slag.
  • the blast furnace slag is a by-product of the ironmaking process.
  • the output is huge. 300-450kg of blast furnace slag can be produced for every ton of pig iron smelted.
  • Blast furnace slag is a fusible substance formed by gangue, ash, flux and other impurities that cannot enter pig iron.
  • the chemical composition of blast furnace slag has little fluctuation.
  • the chemical composition of blast furnace slag is similar to that of ordinary Portland cement, and the composition is silicon.
  • the main components of salt and aluminosilicate are CaO, MgO, SiO 2 , Al 2 O 3 and MnO.
  • Some special pig iron slag also contains TiO 2 and V 2 O 5 .
  • the slag discharge temperature of blast furnace slag is above 1400°C, and the heat content per ton of blast furnace slag is about 1675MJ, which is equivalent to the heat released by 58kg standard coal.
  • the main method of blast furnace slag treatment in my country is to produce cement or concrete after water quenching or air cooling. Not only is a large amount of slag heat wasted during the cooling process, but its added value is generally low, and only the heat loss of blast furnace slag is one item. , The energy loss is as high as 14.2 million tons of standard coal per year.
  • Steel slag is mainly composed of CaO, SiO 2 , Fe 2 O 3 , MgO, Al 2 O 3 , MnO and P 2 O 5. Some steel slag also contains TiO 2 and V 2 O 5 , which also contains about 7-10% wt metal particles (steel particles).
  • the mineral phases in steel slag include magnesia rhodonite (3CaO ⁇ MgO ⁇ 2 SiO 2 ), forsterite (CaO ⁇ MgO ⁇ SiO 2 ), tricalcium silicate (3CaO ⁇ SiO 2 , C 3 S), silicic acid Solid solutions formed by dicalcium (2CaO ⁇ SiO 2 , C 2 S), dicalcium ferrite (2CaO ⁇ Fe 2 O 3 ), and divalent oxides such as magnesium, iron, and manganese (RO phase).
  • the mineral composition of steel slag mainly depends on the chemical composition and has a great relationship with the alkalinity of the slag.
  • steel slag also contains a small amount of FeS and MnS, which react with water to form Fe(OH) 3 and Fe(OH) 2 , resulting in volume expansion. Therefore, the volume stability of steel slag is poor, and the reaction generally takes a long time Stacking and aging treatment.
  • blast furnace slag The use of blast furnace slag is currently mainly concentrated in the following aspects. The most extensive and mature application is in the construction industry. After blast furnace slag is quenched in water, it is crushed and ball milled to produce cement. The application in the field of materials is mainly to prepare blast furnace slag into glass-ceramics and porous glass. Some people have also studied the use of centrifugal process to prepare blast furnace slag into glass fibers and fiber products, such as mineral wool, which is used for heat preservation and heat insulation materials. There is no mature industrial application. The process of preparing glass-ceramics with blast furnace slag as the main raw material has been relatively mature, and the performance of the prepared glass-ceramics is relatively stable. However, the high content of Al 2 O 3 and SiO 2 in the blast furnace slag limits the utilization rate of the blast furnace slag and the performance of glass-ceramics.
  • steel slag is used to produce phosphate fertilizer.
  • Steel slag can also be used for wastewater treatment and adsorption of Ni, Cu, Pb and other elements in water.
  • it is used for the production of steel slag cement, road construction and so on.
  • a method for centrifugal casting of composite steel pipes using slag which is characterized in that it comprises:
  • the slag includes one selected from the following: blast furnace slag and steel slag.
  • the most ideal treatment process for blast furnace slag or steel slag is that waste heat and molten slag can be applied simultaneously in one step, that is, the composition and structure of blast furnace slag or steel slag can be adjusted at high temperature, and then the blast furnace slag or steel slag can be treated by a special metallurgical process.
  • Blast furnace slag or steel slag melt is prepared into useful materials, and products with high added value are developed, while the problems of waste heat recovery and solid waste discharge are solved, and economic, environmental and social benefits are improved.
  • Blast furnace slag ( ⁇ ) refers to the gangue in the ore, the ash in the fuel, and the non-volatile components in the solvent (usually limestone) during the blast furnace ironmaking process. Solid Waste.
  • Step slag ( ⁇ ) refers to a by-product in the steelmaking process, which is formed from various oxides formed by the oxidation of impurities such as silicon, manganese, phosphorus, and sulfur in pig iron during the smelting process. And these oxides and solvents are formed by the reaction of salts.
  • the invention utilizes the molten blast furnace slag or steel slag produced in the ironmaking and steelmaking process to prepare a wear-resistant and corrosion-resistant glass and/or glass-ceramic lining layer on the inner surface of the steel pipe by using centrifugal casting technology.
  • the preparation process does not require external provide energy.
  • Ordinary steel pipes are lined with blast furnace slag or steel slag to form composite steel pipes.
  • the composite steel pipes can be used for the transportation of corrosive liquids, corrosive liquids containing abrasive particles and gases, and have broad application prospects in the fields of metallurgy, ore and chemical industry.
  • the main components of blast furnace slag are CaO, MgO, SiO 2 , Al 2 O 3 and MnO, etc.
  • the chemical composition is similar to ordinary silicate glass.
  • glass powder, quartz powder, or glass powder containing B 2 O 3 is directly added to molten steel slag to modify the molten blast furnace slag and reduce the ratio of CaO and MgO contained in the blast furnace slag Then, the molten blast furnace slag after adjusting the composition is injected into the steel pipe, and a glass and/or glass-ceramic lining is formed on the inner surface of the steel pipe using a centrifugal casting process to improve the performance of the glass and/or glass-ceramic.
  • the melting of the quartz powder or glass powder may reduce the temperature and viscosity of the molten steel slag. Increased, the workmanship deteriorates.
  • the thermite centrifugal process is adopted, and a certain amount of thermite is first filled in the steel pipe, the steel pipe is centrifuged and rotated, the thermite is ignited, and a thin layer of alumina ceramic is formed in the steel pipe.
  • heat is generated to compensate for the temperature drop of the blast furnace slag melt caused by the addition of glass powder or quartz powder, increase the fluidity of the blast furnace slag melt, and facilitate the preparation of a high-performance glass ceramic lining layer with a smooth surface and a dense overall.
  • the steel slag contains metal particles.
  • the traditional process is to pulverize the steel slag, and then use the magnetic separation process to select the metal.
  • the equipment In the process of steel slag crushing, the equipment is severely worn, the energy consumption is high, and the efficiency is low.
  • the steel slag in a molten state is injected into the steel, using a centrifugal casting process for forming glass-ceramic lined steel pipe inner surface, the slag melt density of about 3.1-3.6 g / cm 3, and wherein molten metal particles (metal droplet) a density of about 7.8 g / cm 3, under the action of centrifugal force, a higher density metal and slag droplet hierarchical distributed in the innermost layer in contact with the inner surface of the steel pipe, is formed Metal transition layer, slag is distributed on the innermost surface.
  • Steel slag contains more CaO and MgO, and the performance of directly preparing glass or glass-ceramics is poor.
  • glass powder, quartz powder and/or glass powder containing B 2 O 3 are directly added to molten steel slag to modify the steel slag and improve the performance of glass and/or glass-ceramics.
  • the dissolution of the glass powder, quartz powder and/or glass powder may cause damage to the molten steel slag.
  • the temperature decreases, the viscosity increases, and the manufacturability deteriorates.
  • the aluminothermic centrifugal process is first used, and a certain amount of thermite is first filled in the steel pipe, the steel pipe is centrifuged and rotated, the thermite is ignited, and a thin layer of alumina is formed in the steel pipe.
  • the ceramic layer generates heat at the same time to compensate for the decrease in the temperature of the steel slag melt caused by the addition of glass powder and quartz powder, increase the fluidity of the steel slag melt, and facilitate the preparation of high-performance glass and/or glass-ceramics with a smooth surface and a dense overall lining.
  • the thermal expansion coefficient of the alumina ceramic layer first formed on the inner surface of the steel pipe by the thermite centrifugal process is closer to the thermal expansion coefficient of glass and/or glass-ceramic, which is equivalent to forming a transition layer between the steel pipe and the glass and/or glass-ceramic first. Cracking tendency of small glass and/or glass-ceramic lining.
  • the inventor has conducted research and experiments, and on the basis of this research and experiment, proposed the use of centrifugal casting technology to treat molten blast furnace slag or steel slag melt, and melt it under the action of centrifugal force.
  • the glassy blast furnace slag or steel slag forms a wear-resistant and corrosion-resistant glass and/or glass-ceramic lining layer on the inner surface of the steel pipe to manufacture a wear-resistant and corrosion-resistant composite steel pipe.
  • the specific method is to first collect molten blast furnace slag or steel slag in a special container.
  • the composition of blast furnace slag is relatively stable, while the composition of steel slag fluctuates greatly, and the steel slag is divided into front slag and tailings.
  • the tailings have strong glass forming ability, and the metal content is also very small.
  • the molten tailings are poured into a special container and collected, and then cast into a steel pipe rotating on a centrifuge to form a glass layer on the inner surface of the steel pipe to prepare a composite steel pipe lined with glass and/or glass-ceramics.
  • the glass forming ability of molten blast furnace slag or steel slag can be improved by adding effective ingredients that change the characteristics of molten slag, such as adding ordinary glass powder, quartz powder (SiO 2 powder), B 2 O 3 Powder adjusts the composition of blast furnace slag or steel slag.
  • effective ingredients that change the characteristics of molten slag such as adding ordinary glass powder, quartz powder (SiO 2 powder), B 2 O 3 Powder adjusts the composition of blast furnace slag or steel slag.
  • quartz powder SiO 2 powder
  • B 2 O 3 Powder adjusts the composition of blast furnace slag or steel slag.
  • the first is to add powder to the steel slag collection container and stir to form a uniform melt.
  • the second method is to first brush the inner surface of the steel pipe with the added powder, and then cast the blast furnace slag or steel slag melt to achieve the purpose of adjusting the composition of the blast furnace slag or steel slag.
  • molten blast furnace slag or steel slag is cast because of the large difference between the expansion coefficient of the formed glass and the steel pipe, a large thermal stress (tensile stress or compressive stress) will be generated in the glass layer after cooling, and thermite-centrifugal
  • the process first prepares a layer of alumina ceramic layer on the inner surface of the steel pipe, and then casts molten blast furnace slag or steel slag. Because there are metal and alumina ceramic layers, it can relieve thermal stress and prevent the glass layer or glass-ceramic layer from cracking.
  • the first is to prepare the steel pipe, remove rust and install it.
  • Steel pipe size outer diameter 159mm, inner diameter 139mm, length 1000mm. Derusting the inner surface of the steel pipe, using sandblasting to remove rust.
  • the two ends of the steel pipe are installed with heads, graphite discs are installed in the heads, and a round hole is left in the middle of the graphite sheets.
  • the graphite is resistant to high temperature and can isolate the glass melt and steel, preventing the steel head from being corroded by the glass melt. Deformed. Install the steel pipes with heads at both ends on the centrifuge.
  • blast furnace slag into a special slag bag. Start the centrifuge, and when the required speed is reached, the blast furnace slag melt is poured into the steel pipe through the funnel of one end of the steel pipe into the steel pipe, and the steel pipe is kept rotating at high speed for 2-3 minutes. After the blast furnace slag melt is solidified and formed, centrifuge it The machine stops rotating. The steel pipe is unloaded from the centrifuge, placed in the atmosphere, and slowly cooled to form a glass lining layer with a thickness of 3-4mm in the steel pipe.
  • the first is to prepare the steel pipe, remove rust and install it.
  • Steel pipe size outer diameter 159mm, inner diameter 139mm, length 1000mm.
  • the inner surface of the steel pipe is derusted by sandblasting.
  • a head is installed at both ends of the steel pipe, a graphite disc is installed in the head, and a round hole is left in the middle of the graphite sheet.
  • the blast furnace slag melt is poured into the steel pipe through the funnel of one end of the steel pipe into the steel pipe, and the steel pipe is kept rotating at high speed for 2-3 minutes. After the blast furnace slag melt is solidified and formed, centrifuge it The machine stops rotating. The steel pipe is unloaded from the centrifuge, placed in the atmosphere, and slowly cooled to form a glass lining layer with a thickness of 3-4mm in the steel pipe.
  • the first is to prepare the steel pipe, remove rust and install it.
  • Steel pipe size outer diameter 159mm, inner diameter 139mm, length 1000mm.
  • the inner surface of the steel pipe is derusted by sandblasting.
  • the heads are equipped with graphite discs, and the graphite sheets are left in the middle. Out of the round hole.
  • the igniter button After reaching the required speed, press the igniter button to ignite the thermite, the thermite burns, and a metal layer and alumina ceramic layer are formed on the inner surface of the steel pipe.
  • the steel pipe is heated and its surface is reddish.
  • the blast furnace slag melt is poured into the steel pipe through a funnel deep into the steel pipe at one end of the steel pipe, and the steel pipe is kept rotating at a high speed for 5-10 minutes. After the blast furnace slag melt is solidified and formed, the centrifuge is stopped. The steel pipe is unloaded from the centrifuge, placed in the atmosphere, and slowly cooled to form a ceramic glass lining layer with a thickness of 5-6mm in the steel pipe.
  • the first is to prepare the steel pipe, remove rust and install it.
  • Steel pipe size outer diameter 159mm, inner diameter 139mm, length 1000mm.
  • the inner surface of the steel pipe is derusted by sandblasting.
  • the two ends of the steel pipe are installed with heads, graphite discs are installed in the heads, and a round hole is left in the middle of the graphite sheets.
  • the graphite is resistant to high temperature and can isolate the glass melt and steel to prevent the steel head from being corroded by the glass melt. Deformed. Install the steel pipes with heads at both ends on the centrifuge.
  • the first is to prepare the steel pipe, remove rust and install it.
  • Steel pipe size outer diameter 159mm, inner diameter 139mm, length 1000mm.
  • the inner surface of the steel pipe is derusted by sandblasting.
  • the steel slag melt is poured into the steel pipe through the funnel of one end of the steel pipe into the steel pipe, and the steel pipe is kept rotating at high speed for 2-3 minutes. After the steel slag melt is solidified and formed, the centrifuge is stopped. Spin. The steel pipe is unloaded from the centrifuge, placed in the atmosphere, and slowly cooled to form a glass lining layer with a thickness of 3-4mm in the steel pipe.
  • the first is to prepare the steel pipe, remove rust and install it.
  • Steel pipe size outer diameter 159mm, inner diameter 139mm, length 1000mm.
  • the inner surface of the steel pipe is derusted by sandblasting.
  • the heads are equipped with graphite discs, and the graphite sheets are left in the middle. Out of the round hole.
  • the igniter button After reaching the required speed, press the igniter button to ignite the thermite, the thermite burns, and a metal layer and alumina ceramic layer are formed on the inner surface of the steel pipe.
  • the steel pipe is heated and its surface is reddish.
  • the steel slag melt is poured into the steel pipe through a funnel deep into the steel pipe through one end of the steel pipe, and the steel pipe is kept rotating at a high speed for 5-10 minutes. After the steel slag melt is solidified and formed, the centrifuge is stopped. The steel pipe is unloaded from the centrifuge, placed in the atmosphere, and slowly cooled to form a ceramic glass lining layer with a thickness of 5-6mm in the steel pipe.

Abstract

Disclosed is a method for centrifugally casting a composite steel pipe by means of slag, the method comprising the following steps: C) casting slag in a molten state into a steel pipe by using a centrifugal casting process; and D) cooling the slag, and forming a glass or glass ceramic lining on the inner surface of the steel pipe, wherein the slag comprises one selected from blast furnace slag and steel slag. Further disclosed is a composite steel pipe manufactured by using the method. According to the method, a wear-resistant and corrosion-resistant glass or glass ceramic lining layer is prepared on the inner surface of the steel pipe by means of a centrifugal casting technique by utilizing molten slag generated in a steelmaking process, and external energy is not needed in the preparation process. The composite steel pipe can be used for conveying corrosive liquids, corrosive liquids containing abrasion particles, and gases, and has a wide application prospect in the fields of metallurgy, ore and chemical engineering.

Description

利用炉渣离心铸造复合钢管的方法Method for centrifugal casting composite steel pipe using slag 技术领域Technical field
本发明涉及利用炉渣离心铸造复合钢管的方法，所述炉渣包括从高炉渣和钢渣中选出的一种。The invention relates to a method for centrifugal casting of composite steel pipes by using slag. The slag includes one selected from blast furnace slag and steel slag.
背景技术Background technique
钢铁工业的固体废弃物主要由高炉渣或钢渣构成，高炉渣是炼铁过程的副产品，产量巨大，每冶炼1吨生铁可产生300-450kg高炉渣。高炉渣是由脉石、灰分、助熔剂和其他不能进入生铁中的杂质所形成的易熔物质，高炉渣的化学成分波动小，高炉渣的化学成分与普通硅酸盐水泥类似，组成为硅酸盐和铝硅酸盐，主要成分有CaO、MgO、SiO 2、Al 2O 3和MnO等，一些特种生铁渣中还有TiO 2和V 2O 5等。高炉渣出渣温度在1400℃以上，每吨高炉渣含热量约1675MJ，与58kg标准煤释放的热量相当。目前，我国高炉渣处理主要途径是经水淬或空冷后用于生产水泥或混凝土，不但在冷却过程中浪费了大量的熔渣热量，而且其附加值一般较低，仅高炉渣热量损失一项，能源损失量就高达1420万吨标煤/年。 The solid waste in the iron and steel industry is mainly composed of blast furnace slag or steel slag. The blast furnace slag is a by-product of the ironmaking process. The output is huge. 300-450kg of blast furnace slag can be produced for every ton of pig iron smelted. Blast furnace slag is a fusible substance formed by gangue, ash, flux and other impurities that cannot enter pig iron. The chemical composition of blast furnace slag has little fluctuation. The chemical composition of blast furnace slag is similar to that of ordinary Portland cement, and the composition is silicon. The main components of salt and aluminosilicate are CaO, MgO, SiO 2 , Al 2 O 3 and MnO. Some special pig iron slag also contains TiO 2 and V 2 O 5 . The slag discharge temperature of blast furnace slag is above 1400°C, and the heat content per ton of blast furnace slag is about 1675MJ, which is equivalent to the heat released by 58kg standard coal. At present, the main method of blast furnace slag treatment in my country is to produce cement or concrete after water quenching or air cooling. Not only is a large amount of slag heat wasted during the cooling process, but its added value is generally low, and only the heat loss of blast furnace slag is one item. , The energy loss is as high as 14.2 million tons of standard coal per year.
钢渣主要由CaO、SiO 2、Fe 2O 3、MgO、Al 2O 3、MnO和P 2O 5等组成，有些钢渣中还含有TiO 2和V 2O 5，其中还含有约7～10％wt的金属颗粒(钢粒)。钢渣中的矿物相有镁蔷薇辉石(3CaO·MgO·2 SiO 2)、钙镁橄榄石(CaO·MgO·SiO 2)、硅酸三钙(3CaO·SiO 2，C 3S)、硅酸二钙(2CaO·SiO 2，C 2S)、铁酸二钙(2CaO·Fe 2O 3)以及镁、铁、锰等二价氧化物形成的固溶体等(RO相)。钢渣的矿物组成主要取决于化学成分，与渣的碱度关系很大。当C/S＞1.8时，C 3S和C 2S含量可达60～80％，碱度提高，C 3S含量增加。钢渣形成温度在1600℃以上，密度约为3.1～3.6g/cm3。钢渣中C 2S硬度高，用于水泥生产时设备磨损比较严重。钢渣在降温过程中内部有硅酸三钙转变成硅酸二钙等一系列化学反应、产生体积膨胀，固体钢渣裂解、粉化。此外，钢渣中还含有微量的FeS、MnS，遇水发生反应生成Fe(OH) 3和Fe(OH) 2，产生体积膨胀，因此，钢渣的体积稳定性较差，反应前一般要进行长时间堆放和陈化处理。 Steel slag is mainly composed of CaO, SiO 2 , Fe 2 O 3 , MgO, Al 2 O 3 , MnO and P 2 O 5. Some steel slag also contains TiO 2 and V 2 O 5 , which also contains about 7-10% wt metal particles (steel particles). The mineral phases in steel slag include magnesia rhodonite (3CaO·MgO·2 SiO 2 ), forsterite (CaO·MgO·SiO 2 ), tricalcium silicate (3CaO·SiO 2 , C 3 S), silicic acid Solid solutions formed by dicalcium (2CaO·SiO 2 , C 2 S), dicalcium ferrite (2CaO·Fe 2 O 3 ), and divalent oxides such as magnesium, iron, and manganese (RO phase). The mineral composition of steel slag mainly depends on the chemical composition and has a great relationship with the alkalinity of the slag. When C/S>1.8, the content of C 3 S and C 2 S can reach 60-80%, the alkalinity increases, and the content of C 3 S increases. The formation temperature of steel slag is above 1600℃, and the density is about 3.1～3.6g/cm3. The C 2 S in the steel slag has high hardness, and the equipment wears seriously when used in cement production. During the cooling process of the steel slag, there are a series of chemical reactions such as the conversion of tricalcium silicate to dicalcium silicate, resulting in volume expansion, and solid steel slag cracking and powdering. In addition, steel slag also contains a small amount of FeS and MnS, which react with water to form Fe(OH) 3 and Fe(OH) 2 , resulting in volume expansion. Therefore, the volume stability of steel slag is poor, and the reaction generally takes a long time Stacking and aging treatment.
高炉渣的利用目前主要集中在如下几个方面，最广泛和成熟的应 用是在建筑行业，高炉渣经水淬后再粉碎球磨，用于生产水泥。在材料领域的应用主要是将高炉渣制备成微晶玻璃和多孔玻璃，也有人研究利用离心工艺将高炉熔渣制备成玻璃纤维和纤维制品，例如矿物棉，用于保温和隔热材料，但还没有成熟的工业应用。以高炉渣为主要原料制备微晶玻璃的工艺已经较为成熟，所制备的微晶玻璃性能亦较为稳定。但由于高炉渣中Al 2O 3、SiO 2含量较高，限制了高炉渣的利用率以及微晶玻璃的性能。 The use of blast furnace slag is currently mainly concentrated in the following aspects. The most extensive and mature application is in the construction industry. After blast furnace slag is quenched in water, it is crushed and ball milled to produce cement. The application in the field of materials is mainly to prepare blast furnace slag into glass-ceramics and porous glass. Some people have also studied the use of centrifugal process to prepare blast furnace slag into glass fibers and fiber products, such as mineral wool, which is used for heat preservation and heat insulation materials. There is no mature industrial application. The process of preparing glass-ceramics with blast furnace slag as the main raw material has been relatively mature, and the performance of the prepared glass-ceramics is relatively stable. However, the high content of Al 2 O 3 and SiO 2 in the blast furnace slag limits the utilization rate of the blast furnace slag and the performance of glass-ceramics.
目前钢渣的应用主要在如下几个方面，在钢铁行业内利用磁选方法从钢渣回收废钢，代替部分石灰用于铁矿烧结，作为原料代替石灰直接用于炼铁返回高炉，直接用于炼钢返回渣。在农业上用钢渣生产磷肥、钢渣还可用于废水处理、吸附水中的Ni、Cu、Pb等元素。在建筑行业用于生产钢渣水泥、修路等等。At present, the application of steel slag is mainly in the following aspects. In the iron and steel industry, magnetic separation is used to recover scrap steel from steel slag, instead of part of lime for iron ore sintering, as a raw material instead of lime, directly used for ironmaking and returning to the blast furnace, and directly used for steelmaking Return to the slag. In agriculture, steel slag is used to produce phosphate fertilizer. Steel slag can also be used for wastewater treatment and adsorption of Ni, Cu, Pb and other elements in water. In the construction industry, it is used for the production of steel slag cement, road construction and so on.
发明内容Summary of the invention
根据本发明，提供了一种利用炉渣离心铸造复合钢管的方法，其特征在于包括：According to the present invention, there is provided a method for centrifugal casting of composite steel pipes using slag, which is characterized in that it comprises:
C)用离心铸造工艺将熔融状态的炉渣浇铸到钢管内，C) Use centrifugal casting process to cast molten slag into the steel pipe,
D)使炉渣冷却，在钢管内表面形成玻璃和/或微晶玻璃内衬，D) Cool the slag to form a glass and/or glass-ceramic lining on the inner surface of the steel pipe,
其中所述炉渣包括从下列物质中选出的一种：高炉渣和钢渣。The slag includes one selected from the following: blast furnace slag and steel slag.
具体实施方式，目前业界对高炉渣或钢渣的处理主要以余热回收和废渣回收分开的方式进行，这种工艺将“热”和“渣”分离处理，工艺路线简单，减少了不同工艺过程间的相互干扰，但总体效率比较低，尤其是固态钢渣，使用前还需破碎、筛选和烘干等工艺处理，大量消耗能源，产品的附加值较低。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS At present, the treatment of blast furnace slag or steel slag in the industry is mainly carried out in a separate way of waste heat recovery and waste slag recovery. This process separates "heat" and "slag", and the process route is simple, reducing the difference between different processes. Mutual interference, but the overall efficiency is relatively low, especially for solid steel slag, which needs to be crushed, screened and dried before use, which consumes a lot of energy and the added value of the product is low.
高炉渣或钢渣最理想的处理工艺是余热和熔融渣一步同时获得应用，也就是能够在高温调整高炉渣或钢渣的组成和结构，之后利用特殊冶金工艺处理高炉渣或钢渣，在高温熔融状态将高炉渣或钢渣熔体制备成有用的材料，研发出具有高附加值的产品，同时解决余热回收和固体废弃物排放问题，提高经济、环境和社会效益。The most ideal treatment process for blast furnace slag or steel slag is that waste heat and molten slag can be applied simultaneously in one step, that is, the composition and structure of blast furnace slag or steel slag can be adjusted at high temperature, and then the blast furnace slag or steel slag can be treated by a special metallurgical process. Blast furnace slag or steel slag melt is prepared into useful materials, and products with high added value are developed, while the problems of waste heat recovery and solid waste discharge are solved, and economic, environmental and social benefits are improved.
在本申请中，“高炉渣”(Blast furnace slag)指的是在高炉炼铁过程中，由矿石中的脉石、燃料中的灰分和溶剂(一般是石灰石)中的非挥发组分形成的固体废物。In this application, "Blast furnace slag" (高炉渣) refers to the gangue in the ore, the ash in the fuel, and the non-volatile components in the solvent (usually limestone) during the blast furnace ironmaking process. Solid Waste.
在本申请中，“钢渣”(Steel slag)指的是炼钢过程中的一种副 产品，它由生铁中的硅、锰、磷、硫等杂质在熔炼过程中氧化而成的各种氧化物以及这些氧化物与溶剂反应生成的盐类所组成。In this application, "Steel slag" (钢渣) refers to a by-product in the steelmaking process, which is formed from various oxides formed by the oxidation of impurities such as silicon, manganese, phosphorus, and sulfur in pig iron during the smelting process. And these oxides and solvents are formed by the reaction of salts.
本发明利用炼铁和炼钢过程中产生的熔融高炉渣或钢渣，采用离心铸造技术在钢管内表面制备一层耐磨耐腐蚀的玻璃和/或微晶玻璃内衬层，制备过程不需要外部提供能量。普通钢管内衬高炉渣或钢渣后形成复合钢管，该复合钢管可用于腐蚀性液体、含磨损颗粒的腐蚀性液体及气体的输送，在冶金、矿石和化工领域有广阔的应用前景。The invention utilizes the molten blast furnace slag or steel slag produced in the ironmaking and steelmaking process to prepare a wear-resistant and corrosion-resistant glass and/or glass-ceramic lining layer on the inner surface of the steel pipe by using centrifugal casting technology. The preparation process does not require external provide energy. Ordinary steel pipes are lined with blast furnace slag or steel slag to form composite steel pipes. The composite steel pipes can be used for the transportation of corrosive liquids, corrosive liquids containing abrasive particles and gases, and have broad application prospects in the fields of metallurgy, ore and chemical industry.
高炉渣的主要成分有CaO、MgO、SiO 2、Al 2O 3和MnO等，化学成分与普通硅酸盐玻璃类似。 The main components of blast furnace slag are CaO, MgO, SiO 2 , Al 2 O 3 and MnO, etc. The chemical composition is similar to ordinary silicate glass.
在本发明的一个实施例中，向熔融钢渣中直接加入玻璃粉、石英粉、或者加入含B 2O 3的玻璃粉对熔融高炉渣进行改质，降低高炉渣中所含CaO和MgO的比例，再将调整成分后的熔融高炉渣注入钢管内，使用离心铸造工艺在钢管内表面形成玻璃和/或微晶玻璃内衬，改善玻璃和/或微晶玻璃的性能。 In an embodiment of the present invention, glass powder, quartz powder, or glass powder containing B 2 O 3 is directly added to molten steel slag to modify the molten blast furnace slag and reduce the ratio of CaO and MgO contained in the blast furnace slag Then, the molten blast furnace slag after adjusting the composition is injected into the steel pipe, and a glass and/or glass-ceramic lining is formed on the inner surface of the steel pipe using a centrifugal casting process to improve the performance of the glass and/or glass-ceramic.
向熔融高炉渣中直接加入玻璃粉、石英粉和/或含B 2O 3的玻璃粉对钢渣进行改质过程中，因为石英粉或玻璃粉溶解，可能会使钢渣熔体的温度降低，粘度增高，工艺性变差。 In the process of modifying the steel slag by directly adding glass powder, quartz powder and/or glass powder containing B 2 O 3 to the molten blast furnace slag, the melting of the quartz powder or glass powder may reduce the temperature and viscosity of the molten steel slag. Increased, the workmanship deteriorates.
在本发明的另一个实施例中，采用铝热离心工艺，先在钢管内装入一定量的铝热剂，使钢管先离心旋转，点燃铝热剂，先在钢管内形成一薄层氧化铝陶瓷层，同时产生热量，补偿因玻璃粉或石英粉加入造成的高炉渣熔体温度降低，增加高炉渣熔体的流动性，便于制备表面光洁、整体致密的高性能玻璃陶瓷内衬层。In another embodiment of the present invention, the thermite centrifugal process is adopted, and a certain amount of thermite is first filled in the steel pipe, the steel pipe is centrifuged and rotated, the thermite is ignited, and a thin layer of alumina ceramic is formed in the steel pipe. At the same time, heat is generated to compensate for the temperature drop of the blast furnace slag melt caused by the addition of glass powder or quartz powder, increase the fluidity of the blast furnace slag melt, and facilitate the preparation of a high-performance glass ceramic lining layer with a smooth surface and a dense overall.
钢渣中含有金属颗粒，传统工艺是先将钢渣粉碎，再使用磁选工艺选出金属。这种工艺在钢渣粉碎过程中设备磨损严重，能耗高，效率低。The steel slag contains metal particles. The traditional process is to pulverize the steel slag, and then use the magnetic separation process to select the metal. In the process of steel slag crushing, the equipment is severely worn, the energy consumption is high, and the efficiency is low.
在本发明的又一个实施例中，将钢渣在熔融状态注入钢管内，使用离心铸造工艺在钢管内表面形成玻璃陶瓷内衬，钢渣熔体的密度约为3.1-3.6克/厘米 3，而其中熔融金属颗粒(金属熔滴)的密度约为7.8克/厘米 3，在离心力的作用下，较高密度的金属熔滴与熔渣分层，分布在与钢管内表面接触的最内层，形成金属过渡层，熔渣分布在最内表面。 In still another embodiment of the present invention, the steel slag in a molten state is injected into the steel, using a centrifugal casting process for forming glass-ceramic lined steel pipe inner surface, the slag melt density of about 3.1-3.6 g / cm 3, and wherein molten metal particles (metal droplet) a density of about 7.8 g / cm 3, under the action of centrifugal force, a higher density metal and slag droplet hierarchical distributed in the innermost layer in contact with the inner surface of the steel pipe, is formed Metal transition layer, slag is distributed on the innermost surface.
钢渣中含有较多的CaO和MgO，直接制备玻璃或微晶玻璃性能较差。Steel slag contains more CaO and MgO, and the performance of directly preparing glass or glass-ceramics is poor.
在本发明的又一个实施例中，向熔融钢渣中直接加入玻璃粉、石英粉和/或者加入含B 2O 3的玻璃粉对钢渣进行改质，改善玻璃和/或微晶玻璃的性能。 In yet another embodiment of the present invention, glass powder, quartz powder and/or glass powder containing B 2 O 3 are directly added to molten steel slag to modify the steel slag and improve the performance of glass and/or glass-ceramics.
向熔融钢渣中直接加入玻璃粉、石英粉和/或含B 2O 3的玻璃粉对钢渣进行改质过程中，因为玻璃粉、石英粉和/或玻璃粉溶解，可能会使钢渣熔体的温度降低，粘度增高，工艺性变差。 In the process of modifying the steel slag by directly adding glass powder, quartz powder and/or glass powder containing B 2 O 3 to the molten steel slag, the dissolution of the glass powder, quartz powder and/or glass powder may cause damage to the molten steel slag. The temperature decreases, the viscosity increases, and the manufacturability deteriorates.
在本发明的又一个实施例中，先采用铝热离心工艺，先在钢管内装入一定量的铝热剂，使钢管先离心旋转，点燃铝热剂，先在钢管内形成一薄层氧化铝陶瓷层，同时产生热量，补偿因玻璃粉、石英粉的加入造成的钢渣熔体温度降低，增加钢渣熔体的流动性，便于制备表面光洁、整体致密的高性能玻璃和/或微晶玻璃内衬层。In another embodiment of the present invention, the aluminothermic centrifugal process is first used, and a certain amount of thermite is first filled in the steel pipe, the steel pipe is centrifuged and rotated, the thermite is ignited, and a thin layer of alumina is formed in the steel pipe. The ceramic layer generates heat at the same time to compensate for the decrease in the temperature of the steel slag melt caused by the addition of glass powder and quartz powder, increase the fluidity of the steel slag melt, and facilitate the preparation of high-performance glass and/or glass-ceramics with a smooth surface and a dense overall lining.
铝热离心工艺在钢管内表面首先形成的氧化铝陶瓷层与玻璃和/或微晶玻璃的热膨胀系数更为接近，相当于在钢管和玻璃和/或微晶玻璃之间先形成过渡层，减小玻璃和/或微晶玻璃内衬层的开裂倾向。The thermal expansion coefficient of the alumina ceramic layer first formed on the inner surface of the steel pipe by the thermite centrifugal process is closer to the thermal expansion coefficient of glass and/or glass-ceramic, which is equivalent to forming a transition layer between the steel pipe and the glass and/or glass-ceramic first. Cracking tendency of small glass and/or glass-ceramic lining.
针对高炉渣和钢渣回收存在的问题，本发明人进行了研究和试验，并在该研究和试验的基础上，提出采用离心铸造技术处理熔融高炉渣或钢渣熔体，在离心力的作用下使熔融玻璃态的高炉渣或钢渣在钢管内表面形成一层耐磨耐腐蚀的玻璃和/或微晶玻璃内衬层，制造耐磨耐腐蚀的复合钢管。In view of the problems in the recovery of blast furnace slag and steel slag, the inventor has conducted research and experiments, and on the basis of this research and experiment, proposed the use of centrifugal casting technology to treat molten blast furnace slag or steel slag melt, and melt it under the action of centrifugal force. The glassy blast furnace slag or steel slag forms a wear-resistant and corrosion-resistant glass and/or glass-ceramic lining layer on the inner surface of the steel pipe to manufacture a wear-resistant and corrosion-resistant composite steel pipe.
具体的方法是先在特制的容器中收集熔融高炉渣或钢渣。高炉渣一般成分比较稳定，而钢渣成分波动比较大，而且钢渣分前渣和尾渣，一般情况下尾渣玻璃形成能力较强，其中金属含量也很少。将熔融尾渣注入特殊容器中收集好，之后在浇铸到在离心机上旋转的钢管内，在钢管内表面形成玻璃层，制备得到玻璃和/或微晶玻璃内衬复合钢管。The specific method is to first collect molten blast furnace slag or steel slag in a special container. Generally, the composition of blast furnace slag is relatively stable, while the composition of steel slag fluctuates greatly, and the steel slag is divided into front slag and tailings. Generally, the tailings have strong glass forming ability, and the metal content is also very small. The molten tailings are poured into a special container and collected, and then cast into a steel pipe rotating on a centrifuge to form a glass layer on the inner surface of the steel pipe to prepare a composite steel pipe lined with glass and/or glass-ceramics.
另外，如果高炉渣或钢渣成分不理想，可通过添加改变熔融渣特性的有效成分提高熔融高炉渣或钢渣的玻璃形成能力，比如添加普通玻璃粉、石英粉(SiO 2粉)、B 2O 3粉调整高炉渣或钢渣成分。添加的方法有2种，第1种是向钢渣收集容器中添加粉末，搅拌，形成均匀熔体。第2种方法是将添加的粉末先刷涂的钢管内表面上，再浇铸高炉渣或钢渣熔体，达到调整高炉渣或钢渣成分的目的。 In addition, if the composition of blast furnace slag or steel slag is not ideal, the glass forming ability of molten blast furnace slag or steel slag can be improved by adding effective ingredients that change the characteristics of molten slag, such as adding ordinary glass powder, quartz powder (SiO 2 powder), B 2 O 3 Powder adjusts the composition of blast furnace slag or steel slag. There are two ways to add. The first is to add powder to the steel slag collection container and stir to form a uniform melt. The second method is to first brush the inner surface of the steel pipe with the added powder, and then cast the blast furnace slag or steel slag melt to achieve the purpose of adjusting the composition of the blast furnace slag or steel slag.
此外，如果熔融高炉渣或钢渣浇铸后因为形成玻璃的膨胀系数与钢管之间差别较大，冷却后在玻璃层中会产生很大的热应力(拉应力 或压应力)，采用铝热-离心工艺先在钢管内表面制备一层氧化铝陶瓷层，之后再浇铸熔融高炉渣或钢渣，因为有金属和氧化铝陶瓷层存在，能缓解热应力，防止玻璃层或微晶玻璃层开裂。In addition, if the molten blast furnace slag or steel slag is cast because of the large difference between the expansion coefficient of the formed glass and the steel pipe, a large thermal stress (tensile stress or compressive stress) will be generated in the glass layer after cooling, and thermite-centrifugal The process first prepares a layer of alumina ceramic layer on the inner surface of the steel pipe, and then casts molten blast furnace slag or steel slag. Because there are metal and alumina ceramic layers, it can relieve thermal stress and prevent the glass layer or glass-ceramic layer from cracking.
实施例1：Example 1:
首先是准备钢管，除锈和安装。钢管尺寸：外径159mm，内径139mm，长1000mm。钢管内表面除锈，使用喷砂除锈。之后在钢管两端安装上封头，封头内装上石墨圆片，石墨片中间留出圆孔，石墨耐高温，还能隔离玻璃熔体和钢材，防止钢材质封头被玻璃熔体腐蚀和变形。将两端装有封头的钢管装到离心机上。The first is to prepare the steel pipe, remove rust and install it. Steel pipe size: outer diameter 159mm, inner diameter 139mm, length 1000mm. Derusting the inner surface of the steel pipe, using sandblasting to remove rust. Afterwards, the two ends of the steel pipe are installed with heads, graphite discs are installed in the heads, and a round hole is left in the middle of the graphite sheets. The graphite is resistant to high temperature and can isolate the glass melt and steel, preventing the steel head from being corroded by the glass melt. Deformed. Install the steel pipes with heads at both ends on the centrifuge.
将高炉渣收集到特制的渣包中。开动离心机，待达到要求的转速后，将高炉渣熔体通过钢管一端深入到钢管中的漏斗浇铸到钢管内，继续保持钢管高速旋转2-3分钟，待高炉渣熔体凝固成形后使离心机停止旋转。将钢管从离心机上卸下来，在大气中放置，缓慢冷却，在钢管内形成厚3-4mm的玻璃内衬层。Collect blast furnace slag into a special slag bag. Start the centrifuge, and when the required speed is reached, the blast furnace slag melt is poured into the steel pipe through the funnel of one end of the steel pipe into the steel pipe, and the steel pipe is kept rotating at high speed for 2-3 minutes. After the blast furnace slag melt is solidified and formed, centrifuge it The machine stops rotating. The steel pipe is unloaded from the centrifuge, placed in the atmosphere, and slowly cooled to form a glass lining layer with a thickness of 3-4mm in the steel pipe.
实施例2：Example 2:
首先是准备钢管，除锈和安装。钢管尺寸：外径159mm，内径139mm，长1000mm。钢管内表面除锈，使用喷砂除锈。之后在钢管两端安装上封头，封头内装上石墨圆片，石墨片中间留出圆孔。将两端装有封头的钢管装到离心机上。The first is to prepare the steel pipe, remove rust and install it. Steel pipe size: outer diameter 159mm, inner diameter 139mm, length 1000mm. The inner surface of the steel pipe is derusted by sandblasting. Afterwards, a head is installed at both ends of the steel pipe, a graphite disc is installed in the head, and a round hole is left in the middle of the graphite sheet. Install the steel pipes with heads at both ends on the centrifuge.
将高炉渣收集到特制的渣包中。在高炉渣熔体中按设计比例添加20％重量比的玻璃粉，搅拌，待玻璃粉完全熔化形成均匀熔体后再准备浇铸。Collect blast furnace slag into a special slag bag. Add 20% by weight of glass powder to the blast furnace slag melt according to the designed ratio, stir, and prepare for casting after the glass powder is completely melted to form a uniform melt.
开动离心机，待达到要求的转速后，将高炉渣熔体通过钢管一端深入到钢管中的漏斗浇铸到钢管内，继续保持钢管高速旋转2-3分钟，待高炉渣熔体凝固成形后使离心机停止旋转。将钢管从离心机上卸下来，在大气中放置，缓慢冷却，在钢管内形成厚3-4mm的玻璃内衬层。Start the centrifuge, and when the required speed is reached, the blast furnace slag melt is poured into the steel pipe through the funnel of one end of the steel pipe into the steel pipe, and the steel pipe is kept rotating at high speed for 2-3 minutes. After the blast furnace slag melt is solidified and formed, centrifuge it The machine stops rotating. The steel pipe is unloaded from the centrifuge, placed in the atmosphere, and slowly cooled to form a glass lining layer with a thickness of 3-4mm in the steel pipe.
实施例3：Example 3:
首先是准备钢管、除锈和安装。钢管尺寸：外径159mm，内径139mm，长1000mm。钢管内表面除锈，使用喷砂除锈。将5公斤铝热剂粉末(Fe 2O 3粉末和Al粉末，重量比3:1)加入到钢管内，之后在钢管两端安装上封头，封头内装上石墨圆片，石墨片中间留出圆孔。将两端装有封头的钢管装到离心机上。将点火器伸入到石墨孔内，之后开动离心机，待达到要求的转速后，按动点火器按钮点燃铝热剂，铝热剂燃烧，在钢管内表面形成金属层和氧化铝陶瓷层。此时钢管被 加热，表面呈微红色。将高炉渣熔体通过钢管一端深入到钢管中的漏斗浇铸到钢管内，继续保持钢管高速旋转5-10分钟，待高炉渣熔体凝固成形后使离心机停止旋转。将钢管从离心机上卸下来，在大气中放置，缓慢冷却，在钢管内形成厚5-6mm的陶瓷玻璃内衬层。 The first is to prepare the steel pipe, remove rust and install it. Steel pipe size: outer diameter 159mm, inner diameter 139mm, length 1000mm. The inner surface of the steel pipe is derusted by sandblasting. Add 5 kilograms of thermite powder (Fe 2 O 3 powder and Al powder, weight ratio 3:1) into the steel pipe, and then install heads on both ends of the steel pipe. The heads are equipped with graphite discs, and the graphite sheets are left in the middle. Out of the round hole. Install the steel pipes with heads at both ends on the centrifuge. Extend the igniter into the graphite hole, then start the centrifuge. After reaching the required speed, press the igniter button to ignite the thermite, the thermite burns, and a metal layer and alumina ceramic layer are formed on the inner surface of the steel pipe. At this time, the steel pipe is heated and its surface is reddish. The blast furnace slag melt is poured into the steel pipe through a funnel deep into the steel pipe at one end of the steel pipe, and the steel pipe is kept rotating at a high speed for 5-10 minutes. After the blast furnace slag melt is solidified and formed, the centrifuge is stopped. The steel pipe is unloaded from the centrifuge, placed in the atmosphere, and slowly cooled to form a ceramic glass lining layer with a thickness of 5-6mm in the steel pipe.
实施例4：Example 4:
首先是准备钢管，除锈和安装。钢管尺寸：外径159mm，内径139mm，长1000mm。钢管内表面除锈，使用喷砂除锈。之后在钢管两端安装上封头，封头内装上石墨圆片，石墨片中间留出圆孔，石墨耐高温，还能隔离玻璃熔体和钢材，防止钢材质封头被玻璃熔体腐蚀和变形。将两端装有封头的钢管装到离心机上。The first is to prepare the steel pipe, remove rust and install it. Steel pipe size: outer diameter 159mm, inner diameter 139mm, length 1000mm. The inner surface of the steel pipe is derusted by sandblasting. Afterwards, the two ends of the steel pipe are installed with heads, graphite discs are installed in the heads, and a round hole is left in the middle of the graphite sheets. The graphite is resistant to high temperature and can isolate the glass melt and steel to prevent the steel head from being corroded by the glass melt. Deformed. Install the steel pipes with heads at both ends on the centrifuge.
将炼钢钢渣收集到特制的渣包中，选择收集尾渣。开动离心机，待达到要求的转速后，将钢渣熔体通过钢管一端深入到钢管中的漏斗浇铸到钢管内，继续保持钢管高速旋转2-3分钟，待钢渣熔体凝固成形后使离心机停止旋转。将钢管从离心机上卸下来，在大气中放置，缓慢冷却，在钢管内形成厚3-4mm的玻璃内衬层。Collect steel-making steel slag into a special slag bag, and choose to collect tailings. Start the centrifuge, and when the required speed is reached, the steel slag melt is poured into the steel pipe through the funnel of one end of the steel pipe into the steel pipe, and the steel pipe is kept rotating at high speed for 2-3 minutes. After the steel slag melt is solidified and formed, the centrifuge is stopped. Spin. The steel pipe is unloaded from the centrifuge, placed in the atmosphere, and slowly cooled to form a glass lining layer with a thickness of 3-4 mm in the steel pipe.
实施例5：Example 5:
首先是准备钢管，除锈和安装。钢管尺寸：外径159mm，内径139mm，长1000mm。钢管内表面除锈，使用喷砂除锈。之后在钢管两端安装上封头，封头内装上石墨圆片，石墨片中间留出圆孔。将两端装有封头的钢管装到离心机上。The first is to prepare the steel pipe, remove rust and install it. Steel pipe size: outer diameter 159mm, inner diameter 139mm, length 1000mm. The inner surface of the steel pipe is derusted by sandblasting. Then install heads on both ends of the steel pipe, and install graphite discs inside the heads, leaving a round hole in the middle of the graphite sheets. Install the steel pipes with heads at both ends on the centrifuge.
将炼钢钢渣收集到特制的渣包中，选择收集尾渣。在尾渣熔体中按设计比例添加20％重量比的石英粉，搅拌，待石英粉完全熔化形成均匀熔体后再准备浇铸。Collect steel-making steel slag into a special slag bag, and choose to collect tailings. Add 20% by weight of quartz powder to the tailings melt according to the designed ratio, stir, and prepare for casting after the quartz powder is completely melted to form a uniform melt.
开动离心机，待达到要求的转速后，将钢渣熔体通过钢管一端深入到钢管中的漏斗浇铸到钢管内，继续保持钢管高速旋转2-3分钟，待钢渣熔体凝固成形后使离心机停止旋转。将钢管从离心机上卸下来，在大气中放置，缓慢冷却，在钢管内形成厚3-4mm的玻璃内衬层。Start the centrifuge, and when the required speed is reached, the steel slag melt is poured into the steel pipe through the funnel of one end of the steel pipe into the steel pipe, and the steel pipe is kept rotating at high speed for 2-3 minutes. After the steel slag melt is solidified and formed, the centrifuge is stopped. Spin. The steel pipe is unloaded from the centrifuge, placed in the atmosphere, and slowly cooled to form a glass lining layer with a thickness of 3-4mm in the steel pipe.
实施例6：Example 6:
首先是准备钢管、除锈和安装。钢管尺寸：外径159mm，内径139mm，长1000mm。钢管内表面除锈，使用喷砂除锈。将5公斤铝热剂粉末(Fe 2O 3粉末和Al粉末，重量比3:1)加入到钢管内，之后在钢管两端安装上封头，封头内装上石墨圆片，石墨片中间留出圆孔。将两端装有封头的钢管装到离心机上。将点火器伸入到石墨孔内，之后开动离心机，待达到要求的转速后，按动点火器按钮点燃铝热剂，铝热剂燃烧，在钢管内表面形成金属层和氧化铝陶瓷层。此时钢管被 加热，表面呈微红色。将钢渣熔体通过钢管一端深入到钢管中的漏斗浇铸到钢管内，继续保持钢管高速旋转5-10分钟，待钢渣熔体凝固成形后使离心机停止旋转。将钢管从离心机上卸下来，在大气中放置，缓慢冷却，在钢管内形成厚5-6mm的陶瓷玻璃内衬层。 The first is to prepare the steel pipe, remove rust and install it. Steel pipe size: outer diameter 159mm, inner diameter 139mm, length 1000mm. The inner surface of the steel pipe is derusted by sandblasting. Add 5 kilograms of thermite powder (Fe 2 O 3 powder and Al powder, weight ratio 3:1) into the steel pipe, and then install heads on both ends of the steel pipe. The heads are equipped with graphite discs, and the graphite sheets are left in the middle. Out of the round hole. Install the steel pipes with heads at both ends on the centrifuge. Extend the igniter into the graphite hole, then start the centrifuge. After reaching the required speed, press the igniter button to ignite the thermite, the thermite burns, and a metal layer and alumina ceramic layer are formed on the inner surface of the steel pipe. At this time, the steel pipe is heated and its surface is reddish. The steel slag melt is poured into the steel pipe through a funnel deep into the steel pipe through one end of the steel pipe, and the steel pipe is kept rotating at a high speed for 5-10 minutes. After the steel slag melt is solidified and formed, the centrifuge is stopped. The steel pipe is unloaded from the centrifuge, placed in the atmosphere, and slowly cooled to form a ceramic glass lining layer with a thickness of 5-6mm in the steel pipe.

Claims (11)

  1. 利用炉渣离心铸造复合钢管的方法，其特征在于包括：The method for centrifugal casting of composite steel pipe using slag is characterized in that it comprises:
    C)用离心铸造工艺将熔融状态的炉渣浇铸到钢管内，C) Use centrifugal casting process to cast molten slag into the steel pipe,
    D)使炉渣冷却，在钢管内表面形成玻璃和/或微晶玻璃内衬，D) Cool the slag to form a glass and/or glass-ceramic lining on the inner surface of the steel pipe,
    其中所述炉渣包括从下列物质中选出的一种：The slag includes one selected from the following materials:
    高炉渣，和Blast furnace slag, and
    钢渣。Steel slag.
  2. 根据权利要求1所述的方法，其特征在于进一步包括：The method according to claim 1, further comprising:
    B)向熔融状态下的炉渣中加入玻璃粉/石英粉和/或含B2O3的玻璃粉，对炉渣进行改质。B) Adding glass powder/quartz powder and/or glass powder containing B2O3 to the molten slag to modify the slag.
  3. 根据权利要求1所述的方法，其特征在于进一步包括在所述步骤C)之前进行的如下步骤：The method according to claim 1, characterized in that it further comprises the following steps performed before said step C):
    A1)在钢管内装入一定量的铝热剂，A1) Put a certain amount of thermite in the steel pipe,
    A2)使钢管旋转，A2) Rotate the steel pipe,
    A3)点燃铝热剂，在钢管内形成一薄层氧化铝陶瓷层，同时产生热量。A3) The thermite is ignited to form a thin aluminum oxide ceramic layer in the steel pipe, and heat is generated at the same time.
  4. 根据根据权利要求1所述的方法，其特征在于所述步骤D)包括：The method according to claim 1, wherein said step D) comprises:
    继续保持钢管高速旋转至少2-10分钟，Continue to keep the steel pipe rotating at high speed for at least 2-10 minutes,
    待炉渣熔体凝固成形后使离心机停止旋转，After the slag melt is solidified and formed, the centrifuge is stopped,
    将钢管从离心机上卸下来，在大气中放置，缓慢冷却。Unload the steel pipe from the centrifuge, place it in the atmosphere, and cool down slowly.
  5. 根据权利要求1所述的方法，其中所述炉渣为钢渣，且进一步包括：The method of claim 1, wherein the slag is steel slag, and further comprising:
    B)在所述步骤C)之前，向熔融状态下的钢渣中加入石英粉和/或含B2O3的玻璃粉，对钢渣进行改质。B) Before the step C), quartz powder and/or glass powder containing B2O3 are added to the molten steel slag to modify the steel slag.
  6. 根据根据权利要求4所述的方法，其特征在于：The method according to claim 4, characterized in that:
    所述钢渣是尾渣。The steel slag is tailings.
  7. 根据根据权利要求1-3之一所述的方法，其特征在于进一步包 括：The method according to any one of claims 1-3, characterized in that it further comprises:
    向熔融状态的炉渣中添加改变熔融状态的炉渣的特性的材料，以提高熔融状态的炉渣的玻璃形成能力。A material that changes the characteristics of the molten slag is added to the molten slag to improve the glass forming ability of the molten slag.
  8. 根据权利要求6所述的方法，其特征在于改变熔融状态的炉渣的特性的材料包括石英粉和/或B2O3粉。The method according to claim 6, wherein the material that changes the characteristics of the molten slag includes quartz powder and/or B2O3 powder.
  9. 根据权利要求6所述的方法，其特征在于向熔融状态的炉渣中添加改变熔融状态的炉渣的特性的材料的步骤包括从以下步骤中选出的一种：The method according to claim 6, wherein the step of adding a material that changes the characteristics of the molten slag to the molten slag includes one selected from the following steps:
    -在所述步骤C)之前，向盛放有熔融状态的炉渣的收集容器中添加了改变熔融状态的炉渣的特性的材料的粉末，搅拌熔融状态的炉渣，形成均匀熔体，-Before the step C), add powder of a material that changes the characteristics of the molten slag to the collection container containing the molten slag, stir the molten slag to form a uniform melt,
    -在所述步骤C)之前，将添加了改变熔融状态的炉渣的特性的材料的粉末先刷涂在钢管的内表面上。-Before the step C), the powder added with the material that changes the characteristics of the molten slag is first brushed on the inner surface of the steel pipe.
  10. 用根据权利要求1-8之一所述的方法制造的复合钢管。A composite steel pipe manufactured by the method according to any one of claims 1-8.
  11. 根据权利要求9所述的复合钢管，其特征在于：The composite steel pipe according to claim 9, characterized in that:
    炉渣中的金属熔滴在离心力的作用下与炉渣中的熔渣分层，金属熔滴分布在与钢管内表面接触的玻璃和/或微晶玻璃内衬的外层，形成金属过渡层，熔渣分布在玻璃和/或微晶玻璃内衬的内表面。The metal droplets in the slag are layered with the slag in the slag under the action of centrifugal force. The metal droplets are distributed on the outer layer of the glass and/or glass-ceramic lining in contact with the inner surface of the steel pipe to form a metal transition layer and melt The slag is distributed on the inner surface of the glass and/or glass-ceramic lining.
PCT/CN2020/072040 2020-01-14 2020-01-14 Method for centrifugally casting composite steel pipe by means of slag WO2021142624A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN202080025828.6A CN114126783B (en) 2020-01-14 2020-01-14 Method for centrifugally casting composite steel pipe by utilizing slag
PCT/CN2020/072040 WO2021142624A1 (en) 2020-01-14 2020-01-14 Method for centrifugally casting composite steel pipe by means of slag

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/CN2020/072040 WO2021142624A1 (en) 2020-01-14 2020-01-14 Method for centrifugally casting composite steel pipe by means of slag

Publications (1)

Publication Number Publication Date
WO2021142624A1 true WO2021142624A1 (en) 2021-07-22

Family

ID=76863373

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2020/072040 WO2021142624A1 (en) 2020-01-14 2020-01-14 Method for centrifugally casting composite steel pipe by means of slag

Country Status (2)

Country Link
CN (1) CN114126783B (en)
WO (1) WO2021142624A1 (en)

Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4005741A (en) * 1975-03-05 1977-02-01 Elmar Juganovich Juganson Method for the fabrication of tube products
JPH0615428A (en) * 1992-07-01 1994-01-25 Kubota Corp Manufacture of composite cast steel tube
CN1290770A (en) * 2000-10-09 2001-04-11 清华大学 Method for preparing composite pipe with high aluminium devitrified glass lining
CN1302705A (en) * 2000-12-29 2001-07-11 北京盛康宁科技开发有限公司 Technology for making composite cast tube with liner of microcrystal glass
CN101554652A (en) * 2009-05-07 2009-10-14 扬州巨业耐磨复合材料有限责任公司 Method for manufacturing ceramic wear-resistant composite steel pipe
CN101988614A (en) * 2010-11-23 2011-03-23 内蒙古科技大学 Ceramic lining compound steel pipe and preparation method thereof
CN102173588A (en) * 2011-03-10 2011-09-07 内蒙古科技大学 Slag glass ceramic pipe and preparation method thereof
CN106082655A (en) * 2016-06-28 2016-11-09 张雪峰 A kind of method using Technology of EPC to prepare cinder microcrystalline glass composite pipe
CN110756759A (en) * 2018-07-28 2020-02-07 席文君 Method for centrifugally casting composite steel pipe by using steel slag and composite steel pipe

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3863702A (en) * 1973-01-12 1975-02-04 Cabot Corp Centrifugal casting method
FR2297817A1 (en) * 1975-01-16 1976-08-13 Pont A Mousson Cast metal tube with glass liner mfr. - by injecting glass powder into the hot freshly cast metal surface
CN1059364C (en) * 1995-01-17 2000-12-13 东北大学 Pouring protective slag for electric slag centrifugal casting
JP5328569B2 (en) * 2009-08-27 2013-10-30 トヨタ自動車株式会社 Al-Si alloy having fine crystal structure, method for producing the same, device for producing the same, and method for producing the casting
CN103214192B (en) * 2013-04-17 2015-05-20 内蒙古科技大学 Industrial wearable anti-corrosion glass ceramic composite bent pipe and manufacturing method thereof
CN104710108B (en) * 2015-03-17 2017-05-24 内蒙古科技大学 Preparation method of wear-proof and anti-corrosion slag glass ceramic composite pipe
CN108278901A (en) * 2018-01-30 2018-07-13 上海荣丰科技发展有限公司 A kind of industrial furnace and production technology for smelting slag composition adjustment

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4005741A (en) * 1975-03-05 1977-02-01 Elmar Juganovich Juganson Method for the fabrication of tube products
JPH0615428A (en) * 1992-07-01 1994-01-25 Kubota Corp Manufacture of composite cast steel tube
CN1290770A (en) * 2000-10-09 2001-04-11 清华大学 Method for preparing composite pipe with high aluminium devitrified glass lining
CN1302705A (en) * 2000-12-29 2001-07-11 北京盛康宁科技开发有限公司 Technology for making composite cast tube with liner of microcrystal glass
CN101554652A (en) * 2009-05-07 2009-10-14 扬州巨业耐磨复合材料有限责任公司 Method for manufacturing ceramic wear-resistant composite steel pipe
CN101988614A (en) * 2010-11-23 2011-03-23 内蒙古科技大学 Ceramic lining compound steel pipe and preparation method thereof
CN102173588A (en) * 2011-03-10 2011-09-07 内蒙古科技大学 Slag glass ceramic pipe and preparation method thereof
CN106082655A (en) * 2016-06-28 2016-11-09 张雪峰 A kind of method using Technology of EPC to prepare cinder microcrystalline glass composite pipe
CN110756759A (en) * 2018-07-28 2020-02-07 席文君 Method for centrifugally casting composite steel pipe by using steel slag and composite steel pipe

Also Published As

Publication number Publication date
CN114126783B (en) 2023-11-03
CN114126783A (en) 2022-03-01

Similar Documents

Publication Publication Date Title
WO2019071792A1 (en) Production method based on smelting reduction of slag containing zinc and iron
CN106755656A (en) A kind of method that slag metallurgy one-step method is reclaimed
WO2019071788A1 (en) Manufacturing method using copper and iron containing mixing slag
WO2019071793A1 (en) Method for recovering valuable component from slag containing copper
WO2019071796A1 (en) Method for recovering valuable components from mixed slag containing nickel and iron
WO2019071790A1 (en) Method for recovering valuable components from mixed slag containing zinc and iron
WO2019071794A1 (en) Method for recovering valuable components from mixed slag containing copper and iron
WO2019071789A1 (en) Method for recovering valuable components from zinc smelting slag
CN110951972A (en) Method for reducing ironmaking and co-producing calcium-magnesium-aluminum-silicon product by using steel slag
CN102242231B (en) Method for producing flat plate-shaped inorganic non-metallic material by molten slag
JPH0925137A (en) High-strength rock wool and its production
WO2013070121A1 (en) Pyrometallurgical red mud processing method
CN105579598B (en) Method and mineral hydraulic adhesive for handling slag
CN110756759B (en) Method for centrifugally casting composite steel pipe by using steel slag and composite steel pipe
WO2021142624A1 (en) Method for centrifugally casting composite steel pipe by means of slag
CN102559996A (en) New silicon-aluminum-barium-calcium multicomponent deoxidation alloy for steelmaking and preparation technology thereof
Han et al. Comprehensive utilization technology of steel slag
CN111069543A (en) Low-carbon alkaline molten steel heat-preservation covering agent and preparation method thereof
CN111204981B (en) Direct oxygen blowing melting process of secondary kiln slag and method for preparing microcrystalline glass
CN113186486A (en) Method for centrifugally casting composite steel pipe by using blast furnace slag
CN1047632C (en) Amorphous metal alloy and method of producing same
JPS62127413A (en) Raw material charging method for blast furnace
CN107130083A (en) A kind of efficient iron liquid slagging-off thermal-insulating covering agent of aluminosilicate
KR102636627B1 (en) Method for efficient separation of ingreduent in steel making sludge and device
CN102443684A (en) Cinder modifier composition for casting and use method thereof

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 20913799

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 20913799

Country of ref document: EP

Kind code of ref document: A1