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Microwave-fluid bed roasting method for intensifying separation of complex refractory iron ore

A fluidized roasting and iron ore technology, applied in the field of mineral processing, can solve the problems of high energy consumption, high cost, low iron ore grade, etc., achieve good dispersion of mineral particles, realize development and utilization, and uniform roasting products Effect

Active Publication Date: 2018-12-18
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0002] In recent years, the rapid development of my country's iron and steel industry has greatly promoted the demand for iron ore. In 2017, my country imported 1.075 billion tons of iron ore, an increase of 7.5%, and its dependence on foreign countries exceeded 86%. With the improvement of the international iron ore supply and demand relationship Changes have caused domestic iron ore prices to fall sharply and iron mines to suffer serious losses; at the same time, although my country's total iron ore output is large, it generally presents the characteristics of "poor, fine, and miscellaneous", that is, iron ore is of low grade and useful minerals The embedded particle size is fine, the ore composition is complex, and the proportion of refractory iron ore is relatively high. my country's iron ore dressing industry is facing tremendous pressure from low selection indicators, high energy consumption, and high costs.

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  • Microwave-fluid bed roasting method for intensifying separation of complex refractory iron ore

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Effect test

Embodiment 1

[0044] The structure of the microwave-fluidized magnetization roasting device is as follows: figure 1 As shown, it includes a reaction chamber (2) and a microwave cavity (3) that is enclosed within it. The reaction chamber (2) is a cylindrical shape with upper and lower ends closed, and a quartz mesh (15) is provided inside; a thermocouple (10) Insert from the top of the reaction chamber (2), there is a gap between the bottom of the thermocouple (10) and the quartz mesh (15); the bottom of the reaction chamber (2) is provided with a protective gas inlet and a reducing gas inlet , the top is provided with an exhaust port (12); the microwave cavity (3) is equipped with a microwave generating device outside, and the microwave generating device is composed of a waveguide (5), a magnetron (8) and an antenna cap (6), and the waveguide (5 ) is connected to the power supply (4), the waveguide (5) is equipped with a magnetron (8), the magnetron (8) is equipped with a microwave power me...

Embodiment 2

[0053] Method is with embodiment 1, and difference is:

[0054] (1) The complex refractory iron ore used is a hematite-siderite mixed ore in Anshan, with a TFe grade of 34.43%, containing 9.24% FeO, SiO 2 49.41%, harmful elements phosphorus and sulfur were 0.07% and 0.05%.

[0055] (2) The part of complex and refractory iron ore ground to a particle size of ≤0.074mm accounts for 75% of the total mass;

[0056] (3) The protective gas is N 2 ; The reducing gas is H 2 ; The volume flow rate of the reducing gas accounts for 20% of the total volume flow rate of the reducing gas and the protective gas; the reaction temperature is 560°C, and the microwave-fluidized roasting reaction time is 4 minutes; the time to rise to the reaction temperature is 4 minutes;

[0057] (4) Microwave roasting ore grinding to a particle size of ≤0.038mm accounts for 70% of the total mass, and then weak magnetic separation is carried out under the condition of a magnetic field strength of 80kA / m to o...

Embodiment 3

[0059] Method is with embodiment 1, and difference is:

[0060] (1) The part of complex and refractory iron ore ground to a particle size of ≤0.074mm accounts for 80% of the total mass;

[0061] (2) The protective gas is N 2 ; The reducing gas is CH 4 ; The volume flow rate of the reducing gas accounts for 30% of the total volume flow rate of the reducing gas and the protective gas; the reaction temperature is 570°C, and the microwave-fluidized roasting reaction time is 3 minutes; the time to rise to the reaction temperature is 5 minutes;

[0062] (3) Microwave roasting ore grinding until the particle size ≤ 0.038mm accounts for 60% of the total mass, and then weak magnetic separation is carried out under the condition of a magnetic field strength of 85kA / m to obtain magnetically separated iron concentrate, and the magnetically separated iron concentrate The iron grade is 65.2%; the iron recovery rate is 85%, and the iron concentrate separation index has increased by more th...

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Abstract

A microwave-fluid bed roasting method for intensifying separation of complex refractory iron ore comprises the following steps of (1) fine grinding the complex refractory iron ore to obtain iron ore powder, then putting the iron ore powder on a quartz mesh in a reaction chamber, and plugging into a thermocouple; (2) introducing protective gas into the reaction chamber to make the iron ore powder be in a fluidized state; (3) generating a microwave by a magnetron of a microwave cavity outside the reaction chamber to heat the iron ore powder; (4) when the temperature of the iron ore powder risesto reaction temperature, introducing reducing gas to make the iron ore powder have a microwave-fluid bed roasting reaction; and (5) cooling to normal temperature after the reaction is ended, taking out microwave roasted ore, and performing low intensity magnetic separation after ore grinding. According to the method disclosed by the invention, through the specific selective heating advantage of the microwave, single separation degree and grindability of the ore are obviously improved, and resource recovery and efficient development and utilization of the complex refractory iron ore are realized.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a microwave-fluidized roasting method for strengthening the sorting of complex refractory iron ore. Background technique [0002] In recent years, the rapid development of my country's iron and steel industry has greatly promoted the demand for iron ore. In 2017, my country imported 1.075 billion tons of iron ore, an increase of 7.5%, and its dependence on foreign countries exceeded 86%. With the improvement of the international iron ore supply and demand relationship Changes have caused domestic iron ore prices to fall sharply and iron mines to suffer serious losses; at the same time, although my country's total iron ore output is large, it generally presents the characteristics of "poor, fine, and miscellaneous", that is, iron ore is of low grade and useful minerals The embedded particle size is fine, the ore composition is complex, and the proportion of re...

Claims

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Application Information

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IPC IPC(8): C22B1/10
CPCC22B1/10
Inventor 孙永升韩跃新周文涛李艳军高鹏
Owner NORTHEASTERN UNIV
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