Hainan Iron Ore Author：8866 Published：2013-09-10  Sources：海南中地矿业投资有限公司  Views：961

Hainan Iron Ore Products

 

Shilu Hainan is China‘s largest iron ore directly into the furnace of rich iron ore production base, is open-pit mine, the total ore reserves of 314 million tons, the main products for lump ore, iron ore fines and iron powder (Technical Specifications Annex Table). Ore mines with an annual output of 6 million tons, 400 million tons of refined ore production capacity.
Hainan ore hematite (Fe2O3), the biggest feature is the high-silica, low aluminum, phosphorus, are acidic mine. Many imported ore is low silicon, high-alumina. Compared with imported ore, Hainan lower grade ore, but it is a smelting ore Hainan excellent performance, very few harmful impurities with acid mine general ratio of 5% to 10%, and imports of mineral complement. The following details:
First, Hainan has a blast furnace and sinter ore characteristics
1, can improve the burden structure, balance slag alkalinity, acidity with feeding the blast furnace is preferred.
Blast furnace slag basicity must be appropriate, in accordance with the process to meet, the best principles of economy, the charge current industry structure is recognized as the best high basicity sinter feed with addition of acid, into the charge if the alkalinity is too high will lead smelting blast furnace can not. Balance slag basicity solutions generally have three: First, add silica. The disadvantage is that the silica ratio is too small, difficult to uniformly distributed blast furnace, lower grade and more integrated into the furnace, economic efficiency; Second, add the acid pellets. The disadvantage is the high cost; Third, the addition of high silicon Hainan mine. The advantage is a good metallurgical results, lower grade into the furnace less, better than silica economic benefits; while much lower than the cost of pellets. So Hainan mine in improving the charge structure, swap slag alkalinity, production technology and economic indicators with good, a lot of choice with addition of acidic minerals iron and steel enterprises.
Especially in the sinter case has obvious cost advantages, increase the proportion of sintered iron mills to reduce costs before the inevitable consideration. In this case, an appropriate proportion of Hainan ore pellets or replace some high-grade outside the block, can reflect a significant cost advantage.
2, to improve slag fluidity of great benefit.
Blast furnace slag SiO2 content is low, while the high Al2O3, will result in a very difficult slag flow furnace conditions unfavorable, blast furnace slag ditch clean-up volume. Many imported ore is low SiO2 content, Al2O3 high, and high levels of Hainan Mining SiO2, SiO2 / Al2O3 ratio of large, adding a certain amount of Hainan ore can adjust the quantity and composition of the slag, the content of Al2O3 is also reduced, very beneficial improve slag fluidity.
3, will help to improve blast furnace column permeability, increasing the amount of pulverized coal injection, reduce production costs.
Hainan Mining has good resistance to thermal cracking, thermal cracking index excellent; soft melting temperature is relatively high, narrow range of reflow; RDI rate and other characteristics. The combined effect of high permeability are conducive to improving the charge column, furnace conditions conducive to the smooth lines, you can compensate for the increase in the amount of pulverized coal injection material deterioration of the column permeability, and thus help to increase the amount of pulverized coal injection, reduce production costs .
4, composition and stability, particle size uniformity, impurity content is extremely good physical properties.
Hainan mine high iron and high silicon aluminum low phosphorus, is its inherent characteristics, composition is very stable. Lump ore particle size 8 ~ 40mm, 10 ~ 35mm which part 超过 75%, <5mm only about 0.3%, <1mm of only 0.1%. Lump ore particle size uniformity, this feature is better than Brazil, Australia and lump ore.
Hainan ore As, Zn, Na, Cu, Pb and other impurities in very small, in general, As less than 0.005%, respectively, and Zn, Na, Cu, Pb is less than 0.01%, respectively.
5, in favor of retaining the furnace, to extend the life of the blast furnace lining.
In the late blast to use, has long been scouring the bottom hearth iron slag stream gradually eroded after lining damage. TiO2 Hainan ore containing traces of blast furnace smelting production after a period of time, there will be a small amount of TiC, TiN deposited on the surface of the blast damaged, forming a thin protective layer, and prevent further erosion of the lining to extend lining life.
6, suitable for the production of ductile iron.
Hainan features high silicon phosphorus ore, especially phosphorus typically <0.03%, the production of ductile iron of a very good condition, but also another important characteristic of Hainan mine.
7, Hainan powder ore sintering characteristics.
Hainan ore powder composition features high iron and high silicon, silicon content in favor of adjustment sinter; secondly, the particle size of 3 ~ 8mm powder ore accounted for 60% of the mine size composition suitable for nucleation, particles less in the middle, there is conducive to the formation quasi-particles, and improving the permeability of; Third, high strength sintered ore powder Hainan, can improve the quality of sinter.
Second, comparative analysis of the economic benefits of Hainan mine
The main products are Hainan ore lumps, iron ore fines and iron powder, the ingredients of different products have different ways, for example as follows:
2011 a month market price:
Hainan ore: FOB Tianjin Harbour cabin end 1000 yuan / ton (tax included, the same below), 55% of iron, silicon, 17%;
Hainan Fines: FOB Tianjin Harbour cabin bottom 750 yuan / ton, 52% of iron, silicon, 17%;
Hainan iron powder: FOB Tianjin Harbour cabin end 1300 yuan / ton, 63% of iron, silicon, 8%;
Australian PB lump ore: Spot 1400 yuan / ton, 62% of iron, silicon, 5 percent;
Iran Blocks Mine: Spot 1100 yuan / ton, 56% of iron, silicon 11%;
Pellet: 1520 yuan / ton, 61 to 62% iron, silicon 5%;
Silica: 350 yuan / ton;
The first ingredient ways: as a lump ore and lump ore imported directly into the furnace silica alternatives
1,1 tons of Hainan lump ore (55% iron, silicon 17%) is equivalent to Australia with 0.89 tons of lump ore (62% iron, silicon, 5%) with addition of 0.126 tons of silica (silicon 98%), with post-match Prices are as follows:
1400 yuan / ton × 0.89 吨 +350 yuan / ton × 0.126 tonne = 1290 yuan / ton
The above price is significantly higher than the Hainan ore 1,000 yuan / ton. In other words, if you compare the same iron grade, based on the cost of using PB lump ore with addition of silica is much higher than the Hainan lump ore. Use only play structure Hainan lump ore, slag basicity role to improve the swap charge, while Hainan iron ore grade is not low, in fact, reduce raw material costs. In short, buy iron ore Hainan send silicon.
2, with the obvious advantage of the current price of lump ore in Iran contrast, one ton of Hainan lump ore (55% iron, silicon 17%) corresponds with 0.98 tons of Iranian ore (56% iron, silicon 11%) with addition of 0.063 tons of Silica (silicon 98%), with the price with the following: 1100 yuan / ton × 0.98 吨 +350 yuan / ton × 0.063 tonne = 1100 yuan / ton
Thus, even with low-cost alternative to the edge of the imported ore lumps of Hainan, the cost is still no advantage. Iran blocks the same time as a high content of ferrous oxide ore, generally greater than 16%, directly into the furnace using the reduction due to the poor performance caused by the blast furnace coke rate increases, thus increasing the difficulty of blast furnace operation to some extent, by contrast, Hainan advantage smelting hematite easily restore more prominent.
In summary, as with addition of Hainan lump ore slag alkalinity adjustment from the obvious economic benefits superior to the imported ore with addition of silica.
The second ingredient ways: lump ore pellets as an alternative to the acid directly into the furnace
From the metallurgical characteristics, the same acidic charge of lump ore and pellets in Hainan, Hainan ore pellets can be used as a substitute, replacing post-production techniques similar results, although the difference iron grade 6-7%, but the price per ton was differ more than 500 yuan, Hainan economic alternative to lump ore pellets obvious.
The third ingredient ways: iron powder sintering or pelletizing
For imported ore is low silicon with silicon plus about 6%, particle size -200 mesh fraction ≥ 80% of Hainan sintering or pelletizing iron concentrate, but also a balance of sinter pellet feed alkalinity and reduce overall costs The ideal choice of ingredients, with good economic returns.
The fourth way Ingredients: mineral powder sintering
Hainan powder ore sintering high strength, low silicon for imported ore deposits with a 17% increase in Hainan silicon powder sintering ore, sinter can adjust the alkalinity, but also improve the quality of sinter, is a very good complementary ingredients to choose from. In addition, the granularity of Hainan fines 3 ~ 8mm 60%, particle nucleation more conducive to the formation of quasi-particles, and improving the permeability properties.
Practice proved that many steel companies, plus the amount of Hainan with mine, mine either import substitution or replacement with added silica pellets or sintered, to improve production techniques and overall economic indicators are very favorable, especially for a large number of Use a low silicon content of imported ore business even more so.
Currently, users Hainan ore mainly Wuhan Iron and Steel, Nanjing Steel, Shaoguan Steel, Shougang, day iron, iron, Guofeng, Ma Ning steel, Xinxing Ductile Iron Pipes, De Long and other steel mills. The largest user of Wuhan, with annual capacity of 70 to 80 tons.
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Hainan Iron Ore Product Specifications

Name	Point             Analyze             Bear             Fruit（%）
	TFe	SiO2	S	P	Al2O3	CaO	MgO	K2O	Na2O	TiO2
Specifications mine	55±2	17±2	≤0.9	≤0.08	＜1.5	＜1.0	＜1.0	＜0.2	＜0.04	＜0.12
Fines	52±2	17±2	≤0.9					＜0.14
Iron powder	63±2	≤8	≤0.25		＜0.8			＜0.2	＜0.02	＜0.0
Remark： 1, Specification mine: Size 8 to 40 mm ≥ 75%, allowing water 1%, according to TFe54% from the calculation, each increase or decrease of 1.0%, increase or decrease in price of 10 yuan / ton. 2, powder ore: 0-10 mm grain size ≥ 85%, allowing water 2%, according to TFe52% from the calculation, each increase or decrease of 1.0%, increase or decrease in price of 10 yuan / ton. 3, iron powder: particle size -200 mesh fraction ≥ 80%, according to TFe63% from the calculation, every 1% increase or decrease, increase or decrease in price of 10 yuan / dry ton. 4, Hainan iron ore hematite (Fe2O3), Ca, Pb, As content is almost zero.