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Device and method for selective roasting-magnetic separation of fine-grained ilmenite

A technology of ilmenite and fine particles, applied in chemical instruments and methods, magnetic separation, process efficiency improvement, etc., can solve the problems of strong magnetic field force and difficult to obtain effective recovery, etc., achieve rapid response, easy automatic operation, energy The effect of high utilization

Active Publication Date: 2022-06-03
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned deficiencies in the prior art, the present invention provides a device and method for selective roasting-magnetic separation of fine-grained ilmenite, the purpose of which is mainly to overcome the excessive magnetic field force required for the recovery of fine-grained ilmenite magnetic separation, For the problem that it is difficult to obtain effective recovery, the multi-stage cyclone preheater is connected in series, and then it is connected in series with the oxidation reactor, suspension roaster, cyclone separation cylinder, reduction reactor and cooler, and finally cooperates with magnetic separation equipment to treat fine-grained ilmenite The phases of the oxidation and reduction process are precisely controlled, and the iron phase in the ilmenite is selectively converted into a strong magnetic magnetite and then sorted, so as to realize the efficient recycling of valuable components in the fine-grained ilmenite

Method used

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  • Device and method for selective roasting-magnetic separation of fine-grained ilmenite

Examples

Experimental program
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Effect test

Embodiment 1

[0047] The device structure of selective roasting-magnetic separation of fine-grained ilmenite is as follows figure 1 As shown, it includes silo 1, primary cyclone preheater 3, secondary cyclone preheater 4, tertiary cyclone preheater 5, oxidation reactor 6, suspension heating furnace 7, first cyclone separator 8, reduction Reactor 9, second cyclone separation drum 10, water-cooled heat exchanger 11 and weak magnetic separator 12;

[0048] The discharge port of the silo 1 is opposite to the feed port of the screw feeder 2. The discharge port of the screw feeder 2 is connected with the feed port of the first-stage cyclone preheater 3 through a pipeline, and the first-stage cyclone preheater The discharge port of 3 is communicated with the feed port of the secondary cyclone preheater 4 through a pipeline, and the discharge port of the secondary cyclone preheater 4 is communicated with the feed port of the third-stage cyclone preheater 5 through a pipeline;

[0049] The discharg...

Embodiment 2

[0069] The device structure of the selective roasting-magnetic separation of fine-grained ilmenite is the same as that in Example 1;

[0070] The method is the same as in Example 1, except that:

[0071] (1) Fine-grained ilmenite iron grade TFe 14.88%, containing TiO by weight 2 8.89%, SiO 2 34.86%, Al 2 O 3 12.85%, CaO 9.12%, MgO 9.73%, the part with particle size less than 0.038mm in the solid part accounts for 90% of the total mass;

[0072] (2) The volume flow ratio of natural gas and air introduced into the burner 15 per unit time is 1:19;

[0073] (3) The temperature of the preheated ilmenite in the oxidation reactor 6 for the preoxidation reaction is 600°C, and the ratio of the volume flow of the air entering the oxidation reactor 6 to the mass flow of the preheated ilmenite is 0.25 m 3 / kg

[0074] (4) The temperature of the oxide material is 750°C;

[0075] (5) the temperature of the solid material when the reduction reaction is carried out in the reduction r...

Embodiment 3

[0079] The device structure of the selective roasting-magnetic separation of fine-grained ilmenite is the same as that in Example 1;

[0080] The method is the same as in Example 1, except that:

[0081] (1) Fine-grained ilmenite iron grade TFe 11.26%, containing TiO by weight 2 9.29%, SiO 2 38.15%, Al 2 O 3 9.13%, CaO 7.24%, MgO 10.26%, the part with particle size less than 0.038mm in the solid part accounts for 65% of the total mass;

[0082] (2) The volume flow ratio of natural gas and air introduced into the burner 15 per unit time is 1:21;

[0083] (3) The temperature of the preheated ilmenite in the oxidation reactor 6 for the pre-oxidation reaction is 500°C, and the ratio of the volume flow of the air entering the oxidation reactor 6 to the mass flow of the preheated ilmenite is 0.22 m 3 / kg

[0084] (4) The temperature of the oxide material is 650°C;

[0085] (5) the temperature of solid material when reduction reactor 9 carries out reduction reaction is 500 ℃...

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Abstract

A device and method for selective roasting-magnetic separation of fine-grained ilmenite, the device includes a feed bin, a multi-stage cyclone preheater, an oxidation reactor, a suspension heating furnace, a reduction reactor and a weak magnetic separator; the method is: (1) The fine-grained ilmenite is placed in the silo; (2) Start the induced draft fan to form a negative pressure; (3) Start the burner to generate oxygen-enriched high-temperature flue gas and feed it into the suspension roaster; (4) The fine-grained ilmenite released from the silo After preheating, the ilmenite enters the oxidation reactor, and the pre-oxidized material enters the suspension roaster; (5) the secondary oxidation produces the oxide material and enters the reduction reactor through the cyclone separation cylinder; (6) undergoes a reduction reaction with the reducing gas to form the reduced material (7) enter the heat exchanger through the cyclone separation drum, and carry out weak magnetic separation after cooling down. The device and method of the invention can realize the direct utilization of the existing fine-grained ilmenite which is difficult to separate, has high internal energy utilization rate of the system, large equipment processing capacity, is convenient for automatic operation, and is easy to realize industrialization.

Description

technical field [0001] The invention belongs to the technical field of mineral processing and metallurgy, and particularly relates to a device and method for selective roasting and magnetic separation of fine-grained ilmenite. Background technique [0002] Titanium is an important strategic resource. Metal titanium and titanium alloys are non-toxic, non-magnetic, high temperature resistant, and have functional properties such as high hardness, high tensile strength, low density and strong corrosion resistance. They have been widely used in aerospace, Ships, medicine, materials and other fields. The Panxi area is the largest titanium resource base in China, and the titanium resources account for 90% of the national titanium reserves. The conventional ilmenite beneficiation methods are coarse-grained gravity separation-electrical separation, and fine-grained strong magnetic separation-flotation. [0003] Patent CN109433406A discloses a method for recovering ultrafine-grained ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/10F27D17/00B03C1/02
CPCC22B1/10F27D17/004B03C1/02Y02P10/20
Inventor 余建文李佩昱韩跃新李艳军高鹏孙永升
Owner NORTHEASTERN UNIV LIAONING
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