铁矿石粒度对生球团性能的影响_英文_
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Influence of iron ores fineness on green pellets properties
T Umadevi，Naveen F Lobo，Rameshwar Sah，P C Mahapatra
（ JSW Steel Ltd． ，Toranagallu 583275，India）
·36·
2013 年第 4 期
in the range of 2． 0 to 2． 3 kg / m3 the bulk density w as in the order of ore 1 ＞ ore 4 ＞ ore 2 ＞ ore 3． Key words： iron ore； pelletization； fineness； green pellets； physical properties
2013 年第 4 期粒度对生球团性能的影响
T Umadevi，Naveen F Lobo，Rameshwar Sah，P C Mahapatra ( 金达尔钢公司，印度)
摘要： 高炉和 COREX 工艺对铁矿球团的质量提出了要求。铁矿球团的质量由生球质量和焙烧参 数决定。生球特性由矿石的成球行为和矿石特性决定，矿石特性包括矿石的化学成分、矿石本质 （ 硬度） 、比表面积和粒度分布。金达尔钢公司的铁矿石来自 Bellary － Hospet 地区的不同矿点。用 于实验室研究的 3 种铁矿粉（ 矿 1、矿 2 和矿 3） 来自 3 个不同的矿点。用矿 1、矿 2、矿 3 和矿 4（ 混 矿） 制成不同的生球。矿石的邦德功指数的变化范围为 6 ～ 11 kWh / t。从矿石的本质来说，矿 1 较 软，而矿 3 较硬，其硬度范围为： 1 ～ 3。矿石的粒度范围为： － 45 μm 占 56% ～ 68% 。为理解矿石粒 度对生球特性的影响，研究了生球的落下次数、压溃强度，干燥后压溃强度，孔隙度和堆密度。随 着矿石粒度的降低，平均落下次数增加。平均落下次数的变化范围为 6． 5 ～ 14． 7，不同矿石的生球 落下次数的排序为矿 1 ＞ 矿 2 ＞ 矿 4 ＞ 矿 3。矿 1、矿 2 和矿 4 的生球 GCS 和 DCS 随着 － 45 μm 部 分比例的增加而提高，在 64% 时达到最大值，而后随着 － 45 μm 部分比例的继续提高而降低。生 球的 GCS 和 DCS 变化范围分别为 1． 35 ～ 2． 77 kg / p 和 2． 3 ～ 5． 4 kg / p。生球的孔隙度随着矿石粒 度的降低而下降，矿 3 的孔隙度较高，矿 1 的孔隙度较低，这和矿石的硬度相关。生球的堆密度随 矿石粒度的降低而增大。生球的堆密度范围为 2． 0 ～ 2． 3 kg / m3 ，生球堆密度顺序为矿 1 ＞ 矿 4 ＞ 矿 2 ＞ 矿 3。 关键词： 铁矿石； 成球； 粒度； 生球； 物理特性 doi： 10． 3969 / j． issn． 1672 － 9587． 2013． 04． 007
Table 2 Chemical analysis of the raw material %
wFe2O3 wFe wSiO2
wAl2O3 wCaO wMgO wTiO2 wP wS LOI wC wP2O5 wZnO
Ore 4
COREX
Ore 1 Ore 2 Ore 3
Limestone
（ mixed）
1 Introduction JSW Steel limited operates a 4． 2 Mt / a capacity
pellet plant to produce iron oxide pellets． It uses iron ore fines from Bellary － Hospet region． It gets around 15 000 tons of iron ore fines from different mines． 50% － 60% of the iron ore is a washed concentrate of high-grade ore fines，low in alumina and ultra fines （ minus 10 micron） ． The rest 40% － 50% of the iron ore comes from other mines of BellaryHospet region，which are soft and contains high alumina and ultra fines． The hard and soft ore fines behave differently during grinding． Three different types of iron ore fines were collected based on hardness of the ore． Good quality green pellets are necessity to produce good quality pellets． Good quality green pellets should not break during transport to induration furnace and also due to compressive forces acting on them in the bed． Further，green pellets should not spall during drying out of moisture． Spalling of green pellets seriously impacts induration machine bed permeability． So it is necessary to understand the effect of fineness （ － 45 micron size） on green pellets properties of each ore separately as well as in combination．
Abstract： The blast furnace and COREX defines its requirement on iron ore pellet quality． The iron ore pellet quality is depends on the quality of green pellet and induration machine parameters． The green pellet properties depend on pelletization behavior and properties of the ore． The chemical composition， nature of the ore （ hardness） ，specific surface area，and size distribution are the important properties for consideration． JSW Steel Limited gets iron ore from different mines of Bellary-Hospet region． Three different iron ore fines were collected from three different mines for laboratory studies （ ore 1，ore 2，and ore 3） ． Green pellets w ere made using ore 1，ore 2，ore 3 and ore 4 （ mixed ore） ． The bond work index of the ores varies from 6 to 11 kWh / t． The ore 1 is softer and ore 3 is harder in nature． Hardness of ore 3 is in betw een ore 1 and ore 3． The fineness of the ore w as varied from 56% to 68% － 45 micron size． To understand the effect of iron ore fineness on green pellet properties，the drop number，green crushing strength，dry crushing strength，porosity，and bulk density of pellets were studied． With increase in degree of fineness of ore the average drop number improved． The average drop number were in the range of 6． 5 to 14． 7 and varies in the order ore 1 ＞ ore 2 ＞ ore 4 ＞ ore 3． The GCS and DCS of the green pellets of ore 1，ore 2 and ore 4 improved up to － 45 micron size 64% and after wards decreased with increase in iron ore fineness． The GCS and DCS of green pellets w ere in the range of 1． 35 to 2． 77 kg / p and 2． 3 to 5． 4 kg / p respectively． The porosity of the pellets decreased with increase in iron ore fineness． The ore 3 showed higher porosity and ore 1 showed lower porosity due to difference in hardness． The bulk density of the green pellet increased w ith increase in iron ore fineness． The bulk density of the pellets varies and
The feed mix consisted of iron ore fines of different grind，limestone flux to maintain basicity 0． 5，bentonite binder 0． 82% ，COREX sludge to maintain 1． 0% carbon and water to maintain optimum moisture． The chemical analysis，particle size distribution of pellet feed as well as ground product of different mine ores and feed mix proportions are given in Tables 2，3，4 and 5 respectively．
sludge
39． 2
64． 7 64． 1 66． 04 64． 3 1． 26
2． 80 3． 27 2． 20 3． 58
2． 79
8． 76
1． 87 1． 78 1． 69 1． 88
0． 65
6． 17
0． 067 0． 04 0． 03
49． 82 6． 72
T Umadevi，Naveen F Lobo，Rameshwar Sah，P C Mahapatra
（ JSW Steel Ltd． ，Toranagallu 583275，India）
·36·
2013 年第 4 期
in the range of 2． 0 to 2． 3 kg / m3 the bulk density w as in the order of ore 1 ＞ ore 4 ＞ ore 2 ＞ ore 3． Key words： iron ore； pelletization； fineness； green pellets； physical properties
2013 年第 4 期粒度对生球团性能的影响
T Umadevi，Naveen F Lobo，Rameshwar Sah，P C Mahapatra ( 金达尔钢公司，印度)
摘要： 高炉和 COREX 工艺对铁矿球团的质量提出了要求。铁矿球团的质量由生球质量和焙烧参 数决定。生球特性由矿石的成球行为和矿石特性决定，矿石特性包括矿石的化学成分、矿石本质 （ 硬度） 、比表面积和粒度分布。金达尔钢公司的铁矿石来自 Bellary － Hospet 地区的不同矿点。用 于实验室研究的 3 种铁矿粉（ 矿 1、矿 2 和矿 3） 来自 3 个不同的矿点。用矿 1、矿 2、矿 3 和矿 4（ 混 矿） 制成不同的生球。矿石的邦德功指数的变化范围为 6 ～ 11 kWh / t。从矿石的本质来说，矿 1 较 软，而矿 3 较硬，其硬度范围为： 1 ～ 3。矿石的粒度范围为： － 45 μm 占 56% ～ 68% 。为理解矿石粒 度对生球特性的影响，研究了生球的落下次数、压溃强度，干燥后压溃强度，孔隙度和堆密度。随 着矿石粒度的降低，平均落下次数增加。平均落下次数的变化范围为 6． 5 ～ 14． 7，不同矿石的生球 落下次数的排序为矿 1 ＞ 矿 2 ＞ 矿 4 ＞ 矿 3。矿 1、矿 2 和矿 4 的生球 GCS 和 DCS 随着 － 45 μm 部 分比例的增加而提高，在 64% 时达到最大值，而后随着 － 45 μm 部分比例的继续提高而降低。生 球的 GCS 和 DCS 变化范围分别为 1． 35 ～ 2． 77 kg / p 和 2． 3 ～ 5． 4 kg / p。生球的孔隙度随着矿石粒 度的降低而下降，矿 3 的孔隙度较高，矿 1 的孔隙度较低，这和矿石的硬度相关。生球的堆密度随 矿石粒度的降低而增大。生球的堆密度范围为 2． 0 ～ 2． 3 kg / m3 ，生球堆密度顺序为矿 1 ＞ 矿 4 ＞ 矿 2 ＞ 矿 3。 关键词： 铁矿石； 成球； 粒度； 生球； 物理特性 doi： 10． 3969 / j． issn． 1672 － 9587． 2013． 04． 007
Table 2 Chemical analysis of the raw material %
wFe2O3 wFe wSiO2
wAl2O3 wCaO wMgO wTiO2 wP wS LOI wC wP2O5 wZnO
Ore 4
COREX
Ore 1 Ore 2 Ore 3
Limestone
（ mixed）
1 Introduction JSW Steel limited operates a 4． 2 Mt / a capacity
pellet plant to produce iron oxide pellets． It uses iron ore fines from Bellary － Hospet region． It gets around 15 000 tons of iron ore fines from different mines． 50% － 60% of the iron ore is a washed concentrate of high-grade ore fines，low in alumina and ultra fines （ minus 10 micron） ． The rest 40% － 50% of the iron ore comes from other mines of BellaryHospet region，which are soft and contains high alumina and ultra fines． The hard and soft ore fines behave differently during grinding． Three different types of iron ore fines were collected based on hardness of the ore． Good quality green pellets are necessity to produce good quality pellets． Good quality green pellets should not break during transport to induration furnace and also due to compressive forces acting on them in the bed． Further，green pellets should not spall during drying out of moisture． Spalling of green pellets seriously impacts induration machine bed permeability． So it is necessary to understand the effect of fineness （ － 45 micron size） on green pellets properties of each ore separately as well as in combination．
Abstract： The blast furnace and COREX defines its requirement on iron ore pellet quality． The iron ore pellet quality is depends on the quality of green pellet and induration machine parameters． The green pellet properties depend on pelletization behavior and properties of the ore． The chemical composition， nature of the ore （ hardness） ，specific surface area，and size distribution are the important properties for consideration． JSW Steel Limited gets iron ore from different mines of Bellary-Hospet region． Three different iron ore fines were collected from three different mines for laboratory studies （ ore 1，ore 2，and ore 3） ． Green pellets w ere made using ore 1，ore 2，ore 3 and ore 4 （ mixed ore） ． The bond work index of the ores varies from 6 to 11 kWh / t． The ore 1 is softer and ore 3 is harder in nature． Hardness of ore 3 is in betw een ore 1 and ore 3． The fineness of the ore w as varied from 56% to 68% － 45 micron size． To understand the effect of iron ore fineness on green pellet properties，the drop number，green crushing strength，dry crushing strength，porosity，and bulk density of pellets were studied． With increase in degree of fineness of ore the average drop number improved． The average drop number were in the range of 6． 5 to 14． 7 and varies in the order ore 1 ＞ ore 2 ＞ ore 4 ＞ ore 3． The GCS and DCS of the green pellets of ore 1，ore 2 and ore 4 improved up to － 45 micron size 64% and after wards decreased with increase in iron ore fineness． The GCS and DCS of green pellets w ere in the range of 1． 35 to 2． 77 kg / p and 2． 3 to 5． 4 kg / p respectively． The porosity of the pellets decreased with increase in iron ore fineness． The ore 3 showed higher porosity and ore 1 showed lower porosity due to difference in hardness． The bulk density of the green pellet increased w ith increase in iron ore fineness． The bulk density of the pellets varies and
The feed mix consisted of iron ore fines of different grind，limestone flux to maintain basicity 0． 5，bentonite binder 0． 82% ，COREX sludge to maintain 1． 0% carbon and water to maintain optimum moisture． The chemical analysis，particle size distribution of pellet feed as well as ground product of different mine ores and feed mix proportions are given in Tables 2，3，4 and 5 respectively．
sludge
39． 2
64． 7 64． 1 66． 04 64． 3 1． 26
2． 80 3． 27 2． 20 3． 58
2． 79
8． 76
1． 87 1． 78 1． 69 1． 88
0． 65
6． 17
0． 067 0． 04 0． 03
49． 82 6． 72