Method for preparing puddling iron concentrate by high-alumina iron ore
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A technology of iron ore and iron concentrate, which is applied in the field of iron ore dealumination, can solve the problems of inability to dealuminate, complex embedding relationship, difficult dissociation, etc., achieve short leaching time, reduce energy consumption, The effect of low processing cost
Active Publication Date: 2007-09-19
CENT SOUTH UNIV
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Problems solved by technology
Because the aluminum-containing minerals and iron-containing minerals in the ore are closely symbiotic and have a complicated intercalation relationship, especially in some ores, Fe 3+ The lattice substitution of Al 3+ replace Fe 2 o 3 Fe in 3+ , magnetization roasting is difficult to dissociate it; and the method of physical separation cannot achieve the effect of dealumination because it is difficult to dissociate the monomer
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Embodiment 1
[0013] Embodiment 1, see accompanying drawing, TFe content 55.34%, Al 2 o 3 For the hematite ore with a content of 5.26%, after the ore is ground until the particle size is less than 0.074mm and accounts for about 40%, the Na 2 CO 3 Mix it with iron ore, roast it at 1050°C for 10min, put it in the reactor, and leaching it at 150°C according to the liquid-solid mass ratio L / S=4 / 1, NaOH concentration of 120g / L, and the leaching time is 5min, after solid-liquid separation, leaching with dilute sulfuric acid with a mass percentage concentration of 15% at 80°C, the leaching time is 10min, after solid-liquid separation, TFe content of 66.58%, Al 2 o 3 Content 1.94%, Na 2 Iron concentrate with 0.13% O content.
Embodiment 2
[0014] Example 2, see accompanying drawing, TFe content 47.94%, Al 2 o 3 The hematite ore with a content of 10.2% is crushed until the particle size is less than 0.074mm, accounting for about 50%, and the Na 2 CO 3 Mix it with iron ore, roast at 900°C for 30min, then put it in the reactor, leaching at 120°C with the liquid-solid mass ratio L / S=3 / 1, NaOH concentration of 150g / L, the leaching time is 15min, after solid-liquid separation, leaching with 1.0% dilute sulfuric acid at 100°C, the leaching time is 30min, after solid-liquid separation, TFe content of 60.43%, Al 2 o 3 Content 1.84%, Na 2 Iron concentrate with 0.2% O content.
Embodiment 3
[0015] Embodiment 3, see accompanying drawing, TFe content 46.34%, Al 2 o 3 The limonite ore with a content of 8.46% is crushed to a particle size of less than 0.074mm, accounting for about 60%, and the ratio of 25% by mass to Na 2 CO 3 Mix well, roast at 1000°C for 15min, then place in the reactor, leaching at 80°C with liquid-solid mass ratio L / S=6 / 1, NaOH concentration 80g / L, leaching time is 30min, solid-liquid After separation, it is leached with 3.5% dilute sulfuric acid at 120°C for 15 minutes. After solid-liquid separation, TFe content of 62.83%, Al 2 o 3 Content 1.93%, Na 2 Iron concentrate with 0.15% O content.
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Abstract
The invention disclosed a method for manufacturing the iron ore concentrate for ironmaking by the high aluminium iron ore, wherein after iron ore is broken to the granularity of less than 1.0mm which is in 40%-60%, it is mixed with Na2CO3 based on the proportion of 10-40 weight percent, and is braked for 10-30 minutes at the temperature of 900-1050 DEG C, then placed in the reactor to be extracted by 100-150 g / l solution at the temperature of 80-150 DEG C based on the liquid-solid quality rate of 3 / 1 -6 / 1 for 5-30 minutes, the filtrate can be extracted by the dilute sulphuric acid of 1.0-15 mass concentration percent at the temperature of 80-120 DEG C after solid-liquid separation for 10-30 minutes, and the solid is the iron ore concentrate after solid-liquid separation. The content of Al2O3 and Na2O in ore concentrate satisfies the requirement of blast furnace ironmaking materials using the invention. The invention can sufficiently and reasonably use existing rich high aluminium low-grade iron ore with good dealuminzation and low cost for reusing the extractive alkali liquor. The invention is suitable for the dealuminzation of each aluminiferous iron ore, in particular, high aluminium iron ore for reducing the close symbiosis and interdigitating of aluminium-containing minerals and iron-containing minerals, the manufactured iron ore concentrate can be used as the blast furnace ironmaking materials.
Description
technical field [0001] The invention relates to a method for preparing iron ore concentrate for ironmaking from high-aluminum iron ore, in particular to a process for dealuminating iron ore in which aluminium-containing minerals and iron-containing minerals are closely symbiotic and intercalated. Background technique [0002] The sustainable and stable development of the iron and steel industry urgently requires a stable, sufficient and high-quality supply of iron ore raw materials. The existing rich ore and easy-to-select iron ore resources in our country have been gradually exhausted, and the available iron ore resources are increasingly poor, fine and miscellaneous. With the continuous expansion of the scale of my country's iron and steel industry, my country has become the world's largest iron ore importer, and the amount of imported iron ore has accounted for more than half of my country's total iron ore demand. The increasing dependence on iron ore imports has become ...
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