2.5 industrial significance- 12 2.6 mechanism of swelling- 12-13 2.7 thermodynamics and kinetics of iron ore reduction- 13-15 chapter 3 16-20 3. experimental 16-20 3.1 material selection- 17-18 3.2 experimental procedure- 18-19 3.3 determination of degree of reduction of iron-ore pellets- 19 3.4 determination of degree of 19swelling- -20 3.5 determination of drop number- 20.
3.2 swelling index of pellets the swelling indices of both fired magnetite and hematite pellets were determined between 10.32% and 17.88% (table 1). these swelling indices are in the desired range since the industrially acceptable swelling index should be lower than 20% for trouble-free reduction furnace operation.
3.2. swelling index of pellets the swelling indices of both fired magnetite and hematite pellets were determined between 10.32% and 17.88% (table i). these swelling indices are in the desired range since the industrially acceptable swelling index should be lower than 20% for .
A quantitative determination of fe and si in iron ore by activation with 14-mev neutrons sme mining reference handbook, 2nd edition determination of relative free-swelling index test for determination of percent volumetric swelling of iron ore pellets after reduction selected papers on applications of nuclear techniques in minerals exploration .
according to the national standards of the people’s republic of china (gb/t 13240-91 iron ore pellets-method for measuring relative free swelling index) , reduction swelling experiment process was shown in figure 3. a total of 18 pellets of the size 10–12.5 mm were selected.
During ironmaking process, the reduction swelling index (rsi) of pellets below 20% is usually considered as normal swelling, which can guarantee the iron making production smoothly.
Free swelling index ( csn) apparatus . standard : is-1353:1993 & astm- d 720-91 ; determination of free swelling index of materials ; application : coal, hot-bonded pellets, iron ore pellets.
Hematite iron ore pellets fired at 13000c and reduced in coal (-4+6 mesh size) at a temperature of 1000 0 c 5 swelling vs. time plots for the reduction of fired sakaruddin hematite iron 26.
Improving reducibility of iron ore pellets by optimization of physical parameters j. pal a*, s. ghorai a, a. ammasi a, s.k. hota b, v.m. koranne b, t. venugopalan b a csir-national metallurgical laboratory, jamshedpur, india b tata steel ltd., jamshedpur, india (received 06 december 2015; accepted 27 april 2016).
In the present invention, after a powdered iron ore has been subjected to granulation and firing into spherical pellets, a further crushing is applied while adjustment of the particle size of the crushed pellets is made so that the outer surface of the pellets is composed of spherically formed surfaces and crushed surfaces. by doing so, improvements are made in the angle of repose and in the .
In this study, the effect of colemanite and calcined colemanite (cc) addition on the properties of iron ore pellets is studied. the pellets are prepared in a lab without and with 0.2% colemanite .
Increase of iron ore pellets which occurs during reduction under specified conditons. 3.3 free-swelling index a relative measure of the volume increase of iron ore pellets which occurs during the free- swelling test. the index is expressed as a percentage. 4 test method 4.1 outline.
Iron ore pellets - determination of relative free-swelling index 1 scope this international standard specifies a method for the determination of the free-swelling index during un- constrained reduction of fired iron ore pellets. 2 normative references the following standards contain provisions which,.
Iron ore pellets for blast furnace containers--determination of the free-swelling index ics 73.060.10 d31 national standards of people's republic of china replacing gb/t 13240-1991 blast furnace iron pellets determination of free expansion index (iso 4698.2007, mod) published on.2018-05-14 2019-02-01 implementation.
Iron ore pellets for blast furnace feedstocks -- determination of the free-swelling index. mm 6000 or sm 4000. iso 4700. iron ore pellets for blast furnace and direct reduction feedstocks -- determination of the crushing strength. rb 1000. iso 7215.
Iron ore pellets. determination of relative free-swelling index: sector / industry: national standard (recommended) classification of chinese standard: d31: classification of international standard: 73.06: word count estimation: 11,187: date of issue: 1991/11/6: date of implementation: 1992/7/1: quoted standard: gb 6003; gb 6005; gb 8170; gb .
Iron ores, several studies were conducted to correlate the iron ore composition with the metallurgical properties. according to these evaluations, the iron ore chemical specification has been continuously adjusted. 1.1. the steelmaking cost. in steelmaking via dr - electric arc furnace (eaf), when pellets .
Isij international, vol. 34 (1 994), no, 12, pp. 960-963 swelling of lron ore pellets under non-isothermal condition t. sharma departmentof fuel &mineral (received on may engineering, indian school of mines, dhanbad-826004,india. 17. 19941accepted in final form on september16. 7994) in the present investigation an attempt has beenmadeto study the swelling behaviour of iron ore pellets. .
Iso 4698: iron ore pellets for blast furnace feedstocks - determination of the free-swelling index mikko iljana | prosessimetallurgian laboratorio • note! iso 4698 standard swelling test has no co 2 gas component and the sample is put into a pre-heated furnace o this leads to high reduction rate at the beginning of experiment.
Iso 4698:1994 iron ore pellets -- determination of relative free-swelling index. the principle of the method specified is determination of swelling of fired iron ore pellets of a specified size range under isothermal reduction, determination of the volume of pellets before and after reduction at a temperature of 900 c, using a reducing gas consisting of carbon monoxide and nitrogen .
volume swelling of iron ore pellets accompanied with strength decrease appears commonly during reduction. in order to ensure permeability and operation in shaft furnace smelting processes, the maximum swelling index of pellet is always required to be no more than 20% , . numerous researches have been done to reveal the swelling behavior of iron ore pellets.
the iron ore production has significantly expanded in recent years, owing to increasing steel demands in developing countries. however, the content of iron in ore deposits has deteriorated and low-grade iron ore has been processed. the fines resulting from the concentration process must be agglomerated for use in iron and steelmaking. this chapter shows the status of the pelletizing process .
this impedes gas flow in the furnace and results into pressure drop. this in turn causes burden hanging and slipping inside the blast furnace. the addition of dolomite is favorable for the improvement in swelling property of pellets. maximum allowable swelling of pellets for the blast furnace ranges from 16 % to 18 %.
use of iron ore pellets in blast furnace burden. satyendra; j; 1 comment ; bf burden, blast furnace, hot metal, iron ore, iron ore pellets, sinter,; use of iron ore pellets in blast furnace burden pelletizing is a process that involves mixing very finely ground particles of iron ore fines of size less than 200 mesh with additives like bentonite and then shaping them into .
iron ore price: get all information on the price of iron ore including news, charts and realtime quotes.
the effect of various dosages of dolomites on the reduction swelling property of iron ore pellets was studied. experimental results show that the reduction swelling index (rsi) decreases from 13.35% to 4.0%, while the porosity of roasted pellets increases from 35% to 40% with increasing the dolomite dosage from 0 to 10.5%. meanwhile, the content of magnesium ferrite with high melting .
Participation of 35laboratories from 10 countries using four iron ore samplescontaining 45-67% document provides the comprehensive list of chinese national standards and industry standards (total 17,000 standards).iron ores, metalliferous minerals, pellets, swelling, swelling index, volume measurement, reduction methods, test .
Pellet volume measurement/swelling index apparatus. standard : iso: 4698:2007. capacity : determination of free swelling index of iron ore pellets of blast furnace. application : iron ore pellets, hot-bonded pellets. hot shatter apparatus.
Pellets are obtained byadding an appropriate amount of water to the iron ore concentrate; this is a fundamental factor in the formation and growth of pellets, which creates a surface tension that holds the mineral grains cohesive, thus allowing their handling [6, 8].
Possible to make pellets which meet the standards by adequate addition of type and amount of bentonite. keywords: bentonite, pelletizing, iron ore concentrate, binder, sodium bicarbonate introduction major raw material in iron and steel industry is iron ore which can be classified as high grade and low grade in terms of its fe content.
Preparation of mgo added iron ore pellets and effects on a pilot scale blast furnace operation t.-j. chun a, g a, q.-m. meng a*, h.-m. long ab*, p. wang a, c.-g. bi c a* school of metallurgical engineering, anhui university of technology, ma'anshan, anhui, china b* key laboratory of metallurgical emission reduction & resources recycling, ministry of education,.
Production Capacity: 2-40TPH