Iron and aluminum melting separation method for complicated and hard-dressing aluminum and iron intergrowth ore

An aluminum-iron symbiotic ore and separation method technology, applied in the field of metallurgy, can solve the problems of difficult separation, sluggishness, and difficulty in effectively separating iron and aluminum, and achieve the effects of reducing smelting costs, reducing CO2 emissions, and improving production efficiency.

Active Publication Date: 2011-08-31
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] Aiming at the above problems, the present invention proposes a process of adopting gas-based pre-reduction-high-temperature final reduction melting-preparation of calcium aluminate slag-extraction of alumina, thereby fundamentally solv

Method used

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  • Iron and aluminum melting separation method for complicated and hard-dressing aluminum and iron intergrowth ore
  • Iron and aluminum melting separation method for complicated and hard-dressing aluminum and iron intergrowth ore

Examples

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Embodiment 1

[0027] figure 1 An example flow chart of an aluminum-iron symgenetic ore based on pre-reduction-final reduction smelting according to an exemplary embodiment of the present invention is shown. like figure 1 As shown, this exemplary embodiment provides a method for smelting and separating iron and aluminum with complex distribution and refractory aluminum-iron paragenetic ore. The method includes: loading pellets of aluminum-iron paragenetic ore into the pre-reduction furnace 1, Then, carbon monoxide and / or hydrogen are introduced into the pre-reduction furnace 1 to partially reduce the pellets of the Al-Fe paragenetic ore, thereby forming pellets in which part of the iron oxide has been reduced, that is, partially metallized Al-Fe paragenetic ore. Then put the partially reduced pellets into the final reduction smelting furnace 2, further carry out final reduction by carbothermal high temperature, and use the difference in specific gravity between molten iron and alumina-conta...

Embodiment 2

[0029] According to an exemplary embodiment of the present invention, the iron-aluminum melting and separation method of complex embedded and refractory aluminum-iron paragenetic ore includes the following steps.

[0030] 1. Pre-reduction of iron-containing minerals. Add the aluminum-iron paragenetic ore powder or pellets directly from the upper part of the pre-reduction furnace 1 after mud washing, and at the same time, feed the reduction gas into the lower part of the pre-reduction furnace 1. The temperature range of the reduction gas is 750 ° C, and the reduction potential range is 0.6 . In the pre-reduction furnace 1, the iron-containing oxides in the aluminum-iron-containing symbiotic pellets undergo a reduction reaction with carbon monoxide or hydrogen in the reducing gas, and a part of the iron-containing minerals are reduced to obtain a direct reduction with a metallization rate of 40%. Metallized aluminum-iron symbiotic pellets. Here, preferably, considering the suf...

Embodiment 3

[0036] This embodiment is basically the same as Embodiment 2, except that the temperature range of the reducing gas fed into the lower part of the pre-reduction furnace 1 is 950°C, and the reduction potential range is 1.0; the metal of the pellets reduced by the preheating reduction furnace 1 The conversion rate is 90%; in the final reduction step, the fuel ratio of the fuel consisting of 40% lump coal and 60% pulverized coal by weight is about 950kg / tHM, and the basicity of the slag is CaO / SiO 2 =1.5, CaO / Al 2 o 3 =1.4, the secondary combustion rate is controlled to be about 45%, and the corresponding furnace slag temperature is about 1800°C; in the step of recovering alumina from the slag, the basicity of the slag is CaO / SiO 2 =2.1, CaO / Al 2 o 3 = 1.6, containing 98% by weight of calcium aluminate slag in the raw material, and the roasting time is 2 hours; in the high-temperature coal gas hydrogen-enriched reforming step, the coal gas temperature is 1850 ° C, and the mode...

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Abstract

The invention provides an iron and aluminum melting separation method for hard-dressing aluminum and iron intergrowth ore which is embedded in a complex way. The method comprises the following steps of: adding aluminum and iron intergrowth ore into a prereduction furnace (1), aerating carbon monoxide and/or hydrogen into the prereduction furnace (1) to partially reduce the aluminum and iron intergrowth ore, putting the partially reduced aluminum and iron intergrowth ore into a final reduction smelting and separation furnace (2), further performing final reduction on the aluminum and iron intergrowth ore through carbothermic high temperature, and tapping and deslagging respectively by utilizing the formation of an upper liquid phase and a lower liquid phase due to different specific gravities of molten iron and alumina-containing molten slag at high temperature so as to finish melting separation. By the method, the complete separation of iron and aluminum in the hard-dressing and complicated aluminum and iron intergrowth ore can be realized, and the high recovery rate of iron and aluminum is ensured and the comprehensive utilization of the complicated and hard-dressing aluminum andiron intergrowth ore is realized at the same time. Moreover, by the process, products such as iron, alumina, high-quality coal gas, cement, carbon dioxide and the like can be obtained, and exhaust gas and waste residue are not discharged; and the method has the characteristics of low energy consumption and high recovery rate.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, and relates to a smelting process for smelting aluminum-iron paragenetic ore based on a coal-oxygen smelting reduction method to separate high-temperature molten slag and iron. Background technique [0002] my country is rich in iron ore resources, and its total reserves rank among the top in the world, but it also shows the following characteristics: (1) The ore grade is low, and most of the iron ore resources are lean ores with relatively little iron content; (2) Polymetallic The symbiotic ore occupies a certain proportion, and the symbiotic elements with recycling value are often associated with iron-based ores, such as vanadium-titanium magnetite, rare earth symbiotic ore, aluminum-iron symbiotic iron ore, etc.; (3) each valuable element in the ore Difficult to sort, especially polymetallic symbiotic ore, it is difficult to find an effective way to achieve effective separation and extraction...

Claims

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Application Information

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IPC IPC(8): C21B11/00C21B13/14
Inventor 李强邹宗树
Owner NORTHEASTERN UNIV
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