gb/t 13240-2018 pdf english. - chinese standard,iron ore pellets for blast furnace feedstocks--determination of the free-swelling index: sector / industry: national standard (recommended) classification of chinese standard: d31: classification of international standard: 73.060.10: word count estimation: 16,165: date of issue: 2018-05-14: date of implementation: 2019-02-01: older standard (superseded by this standard).swelling behavior of iron ore pellet reduced by h2–co,volume swelling of iron ore pellets accompanied with strength decrease appears commonly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..iron ore pelletizing process: an overview | intechopen,the final use of iron ore pellets in ironmaking reactors requires minimum mechanical properties. pellets must withstand tumbling and falling during transport and mechanical loading inside the reactors due to the charge weight. in order to increase its mechanical strength, green pellets are thermally treated in the induration process..iron ore pelletizing process: an overview,the iron ore pelletizing process consists of three main steps: 1. pelletizing feed preparation and mixing: the raw material (iron ore concentrate, additives anthracite, dolomite and binders are prepared in terms of particle size and chemical specifications, dosed, and mixed together to feed the pelletizing process; 2..
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characteristically indian iron ore are soft and fragile in nature by mining and processing combined generate fines 10-12% lumps become fines while handling. the proportion of lumps to fines generally around 2:3 processing of iron ore as per specification for,effect of blaine fineness on the quality of hematite iron,the results showed improved properties of iron ore pellets at an optimum blaine number (2150 cm(2)/g) but, reduction degradation index was found to be very poor for the given ore. further investigation showed that when mgo containing flux viz. pyroxenite was added, the reduction degradation index and swelling index of the pellets were improved for identical blaine number and other optimized process
green pellet strength and plasticity are important parameters for the productivity of an iron ore pelletizing plant. green pellet strength is described by two test values, that is by drop number and compression strength. the drop number describes the green pellet strength during a fast impact such as the impact that occurs during unloading,pelletisation - metal bulletin,500 million tons quality iron ore ( +63% fe) about 2.5 tons rom iron ore ( or) 1.6 to 2.0 tons of processed iron ore is required for per ton of steel production. to meet this projected steel production of 300 million tons, the rom iron ore requirement will be in the order of over 750 million tons per annum. iron ore industry scenario. 8
the effect of coating on the lowing: 1,200 g of pellet sample consisting of 50% 10– sticking index of hyl quality pellets based on the 12.5 mm and 50% 12.5–16 mm; reduction temperature type, fineness and dosage of coating materials is given of 950æc; 55% h2, 21% co, 14% co2 and 10% n2 re- in table 2. duction gas composition; heating and cooling in n2 as can be seen from the table, it is clear that,iron ore pellet at rs 4500/ton(s) | iron ore pellets | id,iron ore pellets are superior to other substitutes due to their high cold crushing strength resulting in minimal fines generation, while multiple handling resulting in increased savings. with uniform composition of material, size and guaranteed porosity, swelling index and negligible moisture due to dry process provides an added advantage for smooth operation in kiln / furnace and improves productivity.
pellets, a blast furnace operator should know the extent of swelling of pellets. this standard gives a method for determining the swelling index of indurated iron ore pellets. this revised standard now covers two methods for determination of swelling index of iron ore pellets.,is 8624: method for determination of swelling index of,section name: ores and raw materials (mtd 13) designator of legally binding document: is 8624 title of legally binding document: method for determination of swelling index of iron ore pellets number of amendments: equivalence: superceding: superceded by: legally binding document step out from the old to the new--jawaharlal nehru
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, calculation of the free-swelling index, expressed as a percentage, using the difference between the two volumes.,swelling behavior of iron ore pellet reduced by h2–co,swelling of pellet during reduction was examined by a consecutive imaging method. • swelling index (si) increased with temperature but weakened with addition of h 2. • formation of massive wüstite phase led to the swelling firstly. • different iron precipitation caused difference in swelling states in the later.
graph- 6 graph for the degree of swelling fired iron-ore pellets reduced at 820, 870, 920 c at different time – 34 graph- 7 graph for the degree of swelling fired iron-ore pellets reduced at 970 c at different time – 35 graph- 8 graph for the degree of swelling of fired iron-ore pellets reduced at different reduction temperature– 36,swelling of lron ore pellets statistical ,design experiment,swelling index the pellet has been found to be maximumat a critical rate of reduction, which is controlled by reduction temperature, reducing gases. partial pressure andflow rate. firing temperature andtime have beenfound to affect swelling index of pellet by affecting porosity, addition of cao,mgoand sio, has been found to decrease the swelling index of the pellet.
crack generated during reduction. inter-granular and trans-granular cracks are generated during reduction are responsible for the change in volume of iron ore pellets during the transformation from hematite to wustite when swelling is marked as 20-27% .,iron ore pellets – ispatguru,acid pellets (dri pellets) and mgo free pellets exhibit higher swelling at 0.6 basicity and decreased thereafter. mineralogically iron ore pellets comprise essentially hematite (original surviving) particles of iron ore, crystalline silica (quartz, cristobalite and tridymite) and forsterite (mg2sio4).
it has better tumbling index when compared with the calibrated iron ore. uniform chemical composition compared to calibrated lump ore. absence of loi is another advantage of the pellets. the swelling index of pellets is an important of metallurgical property. swelling indicates volume change of pellets during reduction.,swelling of iron ore pellets by statistical design of,swelling index of the pellet has been found to be maximum at a critical rate of reduction, which is controlled by reduction temperature, reducing gases, partial pressure and flow rate. firing temperature and time have been found to affect swelling index of pellet by affecting porosity.
swelling index of the pellets considerably dropped between the basicity range 0.9 to 1.1 due to the formation of calcium ferrite phases with a close pore structure. keywords: iron ore pellet , swelling , silica , basicity , microstructure , physical and metallurgical properties,reduction swelling behaviour of iron ore pellets,• the dynamic swelling of iron ore pellets in a simulated blast furnace atmosphere is considerably more restrained than the corresponding static swelling. thus, the reduction swelling behaviour of iron ore pellets should preferably be studied dynamically under simulated blast furnace conditions to obtain the most realistic results.
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%.,rexon strips limited - iron ore pellets,250 kg/pellet (min). size distribution: 6 – 18mm : 90% (min). under 6mm : 1% (max). tumbler index +6.3mm : 94% (min). -0.6mm 5%(max). swelling index: 15% (max).
iron ores, metalliferous minerals, swelling, swelling index, volume measurement, reduction methods, dimensional changes, pellets, test equipment : ics: 73.060.10: title in french: boulettes de minerais de fer; determination de l'indice relatif de gonflement libre: title in german: eisenerzpellets. bestimmung des schwellverhaltens: committee: ise/58: isbn: 0 580 24027 4,iso 4698:2007 - iron ore pellets for blast furnace,iron ore pellets for blast furnace feedstocks - determination of the free-swelling index iso 4698:2007 specifies a method to provide a relative measure for evaluating the increase in volume of iron ore pellets, when reduced in an unconstrained bed under conditions resembling those prevailing in the reduction zone of a blast furnace.
this international standard specifies a method to provide a relative measure for evaluating the increase in volume of iron ore pellets, when reduced in an unconstrained bed under conditions resembling those prevailing in the reduction zone of a blast furnace. it specifies the,alternative binders to bentonite for iron ore pelletizing,2.1.2 swelling index of pellets: pellets tend to swell during chemical reduction process in the reduction furnaces. swelling of the product pellets should not exceed 20% by volume for a trouble-free operation in the reduction facilities.
figure 5 shows the ri (reduction index) and rsi (reduction swelling index) of fired pellets prepared with different mgo contents. the ri of the fired pellets was improved with the increasing of mgo content. with the content of mgo increased from 0.52% to 2.50%, the ri increased from 73.69% to 74.92%.,is 11092 (2001): iron ore pellets for direct reduction,8 swelling index the swelling index of the iron ore pellets when determined in accordance with is 8624 shall be 18percent,max. 9 softening characteristics 9.1 softening characteristics of iron ore pellets (in powder form) shall be determined in accordance with is 9660 and its requirement shall be agreed to between the supplier and the purchaser.
pellets in this study was measured as per standard: jis: m 8713-2000. swelling index (si) was measured as per standard: is: 8624 -1995. after 3 hrs of reduction in 30% co and 70% n 2 in gas at 900 °c, volume change of pellet was measured by mercury displacement method. percentage of generation of fines (-3.15 mm) after reduction (for 30 min) and,iron ore testing apparartus - salvin instruments,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