Problem description:
Can any experts tell me in detail? I have visited Shaogang. So now we need to know about sintering. I need to write some papers. I just don't understand what sintering is. The key is what waste is produced after sintering? Which is more worthy of attention. And how to remove it. There is also the role of sintering (this simple point will do). Thank you.
Analysis:
1, sintering
The purpose of heat treatment of powder or compact at a temperature below the melting point of the main components is to improve its strength through metallurgical bonding between particles.
2. Sealing material
A kind of material buried in green body for isolation and protection during pre-sintering or sintering.
3. Pre-sintering
The green body is heat-treated at a temperature lower than the final sintering temperature.
4. Pressurized sintering pressure
A sintering process in which uniaxial pressure is applied while sintering.
5. Loose powder sintering and gravity sintering.
Pressureless sintered powder.
6. Liquid phase sintering
Powder or compact with at least two components is sintered in the state of forming a liquid phase.
7. Overburning and sintering
Too high sintering temperature and/or too long sintering time will lead to the deterioration of the final performance of the product.
8. Undersintering
The sintering temperature is too low and/or the sintering time is too short, which leads to the products failing to meet the required performance.
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Because the specific function and application of sintering technology are too extensive, the significance and function of sintering production in iron and steel industry are introduced below.
Most of the iron ore in our country is lean, so it is not economical to make iron directly into the furnace. Therefore, it is necessary to break the lean ore, select the high-grade concentrate, then make the concentrate powder into artificially rich ore, and then enter the blast furnace for smelting. Therefore, powder ore briquetting is an indispensable control link for making full and rational use of lean ore.
Fine ore will be produced in the mining process of rich ore. In order to meet the requirements of blast furnace particle size, fine ore will also be produced during mineral processing. If fine ore is directly fed into blast furnace 565,438+0, it will not be smooth. The technical and economic indexes of blast furnace are deteriorated, so the fine ore must be pressed into a ball before it can enter the furnace.
After the fine ore is repeated, the properties of alloy iron raw materials can be further controlled and improved, and high-quality metallurgical raw materials with high porosity, good reducibility, appropriate strength, high melting temperature and stable composition can be obtained, which is conducive to the stability of furnace conditions and the improvement of technical and economic indicators. In the process of pelletizing, some harmful impurities, such as sulfur, fluorine, arsenic and zinc, can also be removed, which is beneficial to improve the quality of pig iron. Because man-made rich ore is superior to natural rich ore, it has become the main source of raw materials for modern commercial kilns.
Powder briquette can also make comprehensive use of powdery industrial wastes containing iron, bedding and calcium, such as blast furnace dust, steel bars, rolled steel skin, soaking pit slag, sulfuric acid slag, dye iron red, power plant dust pens, etc., and can become cheap raw materials for blast furnaces, reduce environmental pollution and achieve good economic and social benefits.
Fine ore ironmaking is the basis of modern blast furnace smelting and obtaining high quality and high yield, which is of great significance to blast furnace smelting, an indispensable and important process in iron and steel industry production, and plays an important role in the development of iron and steel production.
1.2 powder ore briquetting method
There are many kinds of fines, mainly sinter and pellet. In addition, there are pressed square pellets, rolled pellets and steam-cured pellets, whose pelletizing and consolidation methods are different from those of pellets, and pellet sintering, which is called HPs pelletizing kink ore abroad, which is between pelletizing and sintering; There is also iron coke production, which is a combination of coking and fine ore briquetting.
The roasting method of pellets mainly depends on belt roasting grate-rotating stealing material. Now the local small iron works are still piling alkanes on the flat ground.
There are two main sintering methods: blast sintering and exhaust sintering. Blast sintering includes flat stacking, twisting and twisting, and suction sintering includes road twisting, hard-faced stepping sintering machine, belt sintering machine and ring twisting machine.
Conventional exhaust sintering machines are widely used at home and abroad, and a considerable number of local small iron and steel companies in China use flat air injection, chimney sintering and box exhaust sintering. In addition, there are rotary kiln casting and suspension sintering.
The so-called "sintering" refers to the phenomenon that powdery materials are heated below the melting point and bonded into solids. ……
Recommend some books:
Formation and mineralogy of calcium ferrite during sintering
Author: Guo Xingmin Page: 178 Publication date: 1 July 9991version SSNo. : * * * * * * * *
"National Science and Technology Academic Works Publishing Fund supported the publication of powder sintering theory" Author: Guo Shiju Page: 395 Publication date: 1 March 19981version SSNo. : * * * * * * * *
Sintered Pellets Author: Fu Juying, Jiang Tao, etc. Page number: 40 1 Publication date: 1 February 19961Edition SSNo: * * * * * * * *
"Baosteel Sintering Production Process" Author: Qian Zhiyi, Zhang Jingzhi, Xia, et al. Page number: 242 Publication date: 1 June 9951version SSNo: * * * * * * * * *
New Technology of Powder Metallurgy-Spark Sintering Author: Gao Yiping Page: 204 Publication date: 1 99265438+February1version SSNo. : * * * * * * * *
Defects, Diffusion and Sintering Author: Cui Guowen Page: 226 Publication date: 1990 1 1 version SSNo. : * * * * * * *
Sintered iron ore powder is collected in my library.
Author: [West Germany] F. capel H. Wendeborn Page: 266 Publication date: 1 March 9791version SSNo. : * * * * * * * *
The high vacuum sintering furnace is kept in my library.
Author: Institute of Nonferrous Metals, Ministry of Metallurgical Industry, page 52 Publication date: 1 March 9601version SSNo. : * * * * * * * *
Iron ore sintering is kept in my library.
Author: ам. Balven Novo Page: 3 12 Publication date: 1 958 April1version SSNo: * * * * * * * *
Operation Technology of Sintering Production is in my library.
Author: Huang Ying Waiting Page: 174 Publication date: SSNo. : * * * * * * * *