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Ion-aluminum separation technique of high-alumina brown iron ore

A high-alumina limonite and limonite technology, applied in the direction of improving process efficiency, can solve the problems of difficulty in realizing monomer dissociation and inability to effectively separate iron and aluminum, and achieve increased specific surface area and improved reactivity , Improve the effect of iron grade

Inactive Publication Date: 2007-09-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, for high-alumina limonite, which mainly exists in the form of gibbsite, and is closely embedded with iron-containing minerals, and has a very complicated intercalation relationship, it is difficult to realize the combination of aluminum-containing minerals and iron minerals. Monomer dissociation, physical beneficiation and magnetization roasting cannot effectively separate iron and aluminum

Method used

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  • Ion-aluminum separation technique of high-alumina brown iron ore

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Experimental program
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Embodiment 1

[0011] Embodiment 1: see accompanying drawing, TFe content 52.62%, Al 2 o 3 Limonite ore with a content of 6.23%, crushed to a particle size of less than 1.0mm, roasted at 400°C for 20 minutes, and then placed in a reactor at 150°C, with 100g / L NaOH solution according to the mass liquid-solid ratio L / S =4 / 1 for leaching and dealumination, the leaching time is 35min, after the solid-liquid separation, the filtrate is returned to utilization through causticizing, and the filter cake is reacted with the lime solution at 100°C for 50min, and then the solid-liquid separation, the solid is iron Concentrate, can make the content of TFe in iron concentrate reach 63.20%, Al 2 o 3 The content is 2.6%, Na 2 The O content is 0.19%.

Embodiment 2

[0012] Embodiment 2: see accompanying drawing, TFe content 45.69%, Al 2 o 3 Limonite ore with a content of 8.76%, crushed to a particle size of less than 1.0mm, roasted at a temperature of 450°C for 18 minutes, and then placed in a reactor at 140°C, with 135g / L NaOH solution according to the mass liquid-solid ratio L / S =6 / 1 for leaching and dealumination, the leaching time is 20min, after the solid-liquid separation, the filtrate is returned to utilization through causticization, and the filter cake is reacted with the lime solution at 120°C for 40min, after solid-liquid separation, the solid is iron Concentrate, can make the content of TFe in iron concentrate reach 59.28%, Al 2 o 3 The content is 2.5%, Na 2 The O content is 0.2%.

Embodiment 3

[0013] Embodiment 3: see accompanying drawing, TFe content 48.23%, Al 2 o 3 Limonite ore with a content of 10.95%, crushed to less than 1.0mm, roasted at a temperature of 500°C for 10 minutes, and then placed in a reactor at a temperature of 120°C, with 150g / L NaOH solution according to the mass liquid-solid ratio L / S=3 / 1 for leaching dealumination, the leaching time is 45min, after the solid-liquid separation, the filtrate is returned to utilization through causticization, and the filter cake is reacted with the lime solution at 140°C for 30min, and then the solid-liquid separation, the solid is Iron concentrate can make the content of TFe in iron concentrate reach 61.5%, Al 2 o 3 The content is 3.0%, Na 2 The O content is 0.16%.

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Abstract

The invention discloses a process for separating iron and aluminium from high aluminium brown iron ore, wherein brown iron ore is broken to the granularity of less than 1.0mm, and is actived and braked for 10-20 minutes at the temperature of 400-500 DEG C, then placed in the reactor to have a stripping dealuminzation by 100-150 g / l NaOH solution at the temperature of 120-150 DEG C based on the quality liquid-solid rate of 3 / 1 -6 / 1, the time of stripping is 20-45 minutes, the filtrate can be causticized and be back to reuse after solid-liquid separation, and the filter cake is reacted with lime solution at the temperature of 100- 140 DEG C for 30-50 minutes and then solid-liquid separation, accordingly Al2O3 content can be reduced to 3.0%, and Na2O content can be less than 0.25% in the iron ore concentrate, while iron ore concentrate grade can be greatly improved. The invention is usable for the iron and aluminium separation of brown iron ore with higher-content aluminium oxide in the form of gibbsite of aluminium mineral with good dealuminzation and low process cost, the content of Al2O3 and Na2O in ore concentrate satisfies the requirement of blast furnace ironmaking materials, provided a powerful technical support for the rational use of existing rich high aluminium brown iron ore.

Description

technical field [0001] The invention relates to a high-aluminum limonite iron-aluminum separation process, in particular to a limonite dealumination method in which aluminum-containing minerals exist in the form of gibbsite. Background technique [0002] With the development of my country's iron and steel industry, the existing rich ore and easy-to-select iron ore resources have gradually decreased, and the available iron ore resources are increasingly poor, fine, and miscellaneous, which are refractory iron ore resources. In southern my country and Southeast Asia, there are still a large number of aluminum-containing limonite ores with large reserves. The ores contain high alumina content and cannot be directly used as raw materials for blast furnace ironmaking. At the same time, due to the complex intercalation relationship between limonite minerals and aluminum-containing minerals such as gibbsite, it is one of the refractory iron ores recognized at home and abroad. At p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/12C22B1/02
CPCY02P10/20
Inventor 李光辉姜涛范晓慧刘牡丹郭宇峰许斌杨永斌朱忠平张元波李骞周太华孟君李英白国华黄柱成彭志伟
Owner CENT SOUTH UNIV
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