A microwave-fluidized roasting method for strengthening the separation of complex refractory iron ore

A fluidized roasting and iron ore technology, which is applied in the field of mineral processing, can solve the problems of high energy consumption, fine distribution of useful minerals, and low grade of iron ore, and achieves good mineral particle dispersion and gas-solid contact. Sufficient and uniform effect of roasted products

Active Publication Date: 2020-05-05
NORTHEASTERN UNIV LIAONING
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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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  • A microwave-fluidized roasting method for strengthening the separation of complex refractory iron ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] The structure of microwave-fluidized magnetization roasting device is as follows figure 1 As shown, it includes a reaction chamber (2) and a microwave cavity (3) sleeved on the outside thereof, the reaction chamber (2) is cylindrical with closed upper and lower ends, and a quartz mesh (15) is arranged inside; a thermocouple (10) Inserted from the top of the reaction chamber (2), there is a gap between the bottom end of the thermocouple (10) and the quartz mesh (15); the bottom end 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). The waveguide (5) ) is connected to the power supply (4), a magnetron (8) is mounted above the waveguide (5), a microwave power meter (9) is mounted above the magnetro...

Embodiment 2

[0053] The method is the same as in Example 1, except that:

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

[0055] (2) The part of complex refractory iron ore ground to particle size ≤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 of reducing gas accounts for 20% of the total volume flow of reducing gas and protective gas; the reaction temperature is 560 ° C, the time of microwave-fluidized roasting reaction is 4 min; the time to rise to the reaction temperature is 4 min;

[0057] (4) Microwave roasting and grinding until the particle size ≤ 0.038mm accounts for 70% of the total mass, and then weak magnetic separation is carried out under the condition of a magnetic field stren...

Embodiment 3

[0059] The method is the same as in Example 1, except that:

[0060] (1) The part of complex refractory iron ore ground to particle size ≤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 of reducing gas accounts for 30% of the total volume flow of reducing gas and protective gas; the reaction temperature is 570 ° C, and the microwave-fluidized roasting reaction time is 3 min; the time to rise to the reaction temperature is 5 min;

[0062] (3) Microwave roasting and grinding until the particle size is less than or equal to 0.038mm, accounting for 60% of the total mass, and then performing weak magnetic separation under the condition of a magnetic field intensity of 85kA / m to obtain magnetic separation iron concentrate. The iron grade is 65.2%; the iron recovery rate is 85%, and the selection index of iron concentrate has increased by more than 1%.

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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 specifically 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 external dependence exceeded 86%. Changes, resulting in a sharp drop in domestic iron ore prices and serious losses in iron ore mines; at the same time, although the total output of iron ore in my country is large, it generally presents the characteristics of "poor, fine and miscellaneous", that is, the grade of iron ore is low and useful minerals Due to the fine inlaid particle size, the complex ore composition, and the high proportion of refractory iron ore, my country's iron beneficiation industry is faced with huge pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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 LIAONING
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