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Method for converting limonite into magnetic iron mineral

A limonite and magnetic technology, applied in the field of comprehensive utilization of iron ore, can solve problems such as long roasting time, agglomeration, and unfavorable environment

Inactive Publication Date: 2015-09-30
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this process will take a long time for roasting, high energy consumption, and the carbon-containing tail gas produced at the same time is not good for the environment, and a large number of ore samples are agglomerated during the roasting process, which is not good for later production

Method used

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  • Method for converting limonite into magnetic iron mineral

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Referring to the attached picture, limonite ore with a TFe content of 32.8% and an S content of 2.06% is crushed by a jaw crusher to a particle size of less than 1.0mm, ground by a ball mill to -200, accounting for 60%-80%, and then pressed by a molding machine. For a small cylinder of 10mm×10mm, put the small cylinder into a magnetic field heat treatment device for magnetization roasting, the magnetic field strength is 0.93T, heat it to 850°C for 8-10 minutes, keep it warm for 5 minutes, and cool it by circulating water. After the sample cooled to room temperature, the sample was taken out. The magnetized and roasted sample was subjected to weak magnetic separation to obtain iron concentrate with a grade of 43% and an S content of 0.039%.

Embodiment 2

[0020] Referring to the attached picture, the limonite ore with a TFe content of 31.2% and a S content of 1.98% is crushed by a jaw crusher to a particle size of less than 1.0mm, ground by a ball mill to -200, accounting for 60%-80%, and then pressed by a molding machine. For a small cylinder of 10mm×10mm, put the small cylinder into a magnetic field heat treatment device for magnetization roasting, the magnetic field strength is 1T, heat it to 900°C for 8-10 minutes, keep it warm for 5 minutes, and cool it by circulating water. After the sample cooled to room temperature, the sample was taken out. The magnetized and roasted sample was subjected to weak magnetic separation to obtain iron concentrate with a grade of 48% and an S content of 0.043%.

Embodiment 3

[0022] Referring to the attached picture, limonite ore with a TFe content of 32.8% and an S content of 2.01% is crushed by a jaw crusher to a particle size of less than 1.0mm, ground by a ball mill to -200 to account for 60%-80%, and then pressed by a molding machine. For a small cylinder of 10mm×10mm, put the small cylinder into a magnetic field heat treatment device for magnetization roasting, the magnetic field strength is 1.5T, heat it to 950°C for 8-10 minutes, keep it warm for 5 minutes, and cool it by circulating water. After the sample cooled to room temperature, the sample was taken out. The magnetized and roasted sample was subjected to weak magnetic separation to obtain iron concentrate with a grade of 62% and an S content of 0.029%.

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Abstract

The invention belongs to the field of comprehensive utilization of iron mineral, and particularly relates to a method for converting limonite into magnetic iron mineral. According to the method, the limonite is used as raw materials, mineral grinding, magnetizing roasting in a magnetic field and profiling are carried out, and the samples with 60-80% of limonite with particle size of 200 meshes are pressed into 10 mm x 10 mm columns through a forming press; the columns are put into a vacuumized magnetic field heat treatment device with circulating water pumped in to carry out magnetizing roasting, and drying, magnetizing and desulfurizing are complete in the process at the same time. The magnetic field intensity is 0.9-2T, the calcination temperature is 800-950 DEG C, heater preservation is carried out for 5 min after the preset temperature is reached, the mineral is modified as magnetic mineral, mineral samples are cooled through circulation water and ground, and magnetic separation normal mineral dressing is carried out. According to the method, no reducing agent is added, the magnetizing roasting process is carried out under an external magnetic field, conversion of magnetic mineral can be achieved better in a shorter time, and caking cannot generated in the roasting process. The technological process of the method is simple and easy to operate.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of iron ore, in particular to a method for converting limonite into magnetic iron ore. Background technique [0002] In recent years, with the advancement of society and science and technology, the demand for energy is also expanding, and resources are limited, which makes the use of energy require profit maximization, and at the same time require energy conservation and environmental protection. Due to the characteristics of low grade and difficult separation of limonite itself, the existing limonite beneficiation methods mainly focus on pressing with coal powder or carbon powder in different proportions, putting them into a rotary kiln for magnetization roasting, and then magnetic separation Obtain Iron Concentrate. However, this process requires long roasting time and high energy consumption, and the carbon-containing tail gas produced at the same time is not good for the environment, ...

Claims

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Application Information

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IPC IPC(8): C22B1/02
Inventor 李保卫王建英张雪峰张铁柱
Owner INNER MONGOLIA UNIV OF SCI & TECH
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