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Device and method for extracting iron from iron tailings through suspension roasting

A suspension roasting and suspension roasting furnace technology is applied in the directions of cyclone devices, chemical instruments and methods, magnetic separation, etc., which can solve the problems of low efficiency and poor production continuity.

Active Publication Date: 2020-08-28
上海逢石科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the technical problems such as low efficiency and poor production continuity existing in the existing iron tailings iron extraction technology, the present invention provides a device and method for iron tailings suspension roasting iron extraction

Method used

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  • Device and method for extracting iron from iron tailings through suspension roasting
  • Device and method for extracting iron from iron tailings through suspension roasting

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0063] The structure of the device for iron tailings suspension roasting and iron extraction is as follows: figure 1 As shown, it includes a feeding bin 2, a Venturi dryer 5, a first cyclone preheater 6, a second cyclone preheater 7, a pre-oxidation suspension roaster 8, a heat separation cyclone 10, a suspension reduction roaster 12, Collection bin 18, dry magnetic separator 19, first stage grinding machine 20, first stage weak magnetic separator 21, second stage grinding machine 22, second stage weak magnetic separator 23, dust collector 26 and induced draft fan 30;

[0064] A feeding belt 1 is provided above the feeding bin 2 for transferring materials to the feeding bin 2; a loss-in-weight feeder 3 is arranged between the feeding bin 2 and the screw feeder 4, and the loss-in-weight feeder 3 is connected with the screw feeder 4 respectively. The outlet of the feeding bin 2 is opposite to the feeding end of the screw feeder 4, and the feeding port of the screw feeder 4 is op...

Embodiment 2

[0091] Device structure is the same as embodiment 1;

[0092] The iron tailings used are flotation iron tailings, iron grade TFe 19.24%, containing SiO by mass percentage 2 47%, method is the same as embodiment 1, and difference is:

[0093] (1) Crushing and grinding the iron tailings to a particle size of -0.038mm accounts for 60% of the total mass;

[0094] (2) Control the temperature of the material at the outlet of the Venturi dryer 5 to be 135°C; the solid material is preheated to 450°C in the second cyclone preheater 7;

[0095] (3) The pre-oxidation roasting temperature is 680°C; the residence time of the material entering the pre-oxidation roaster in the pre-oxidation roaster is 15min;

[0096] (4) The reduction roasting temperature is 580°C; 2 / CO and Fe in oxide slag powder 2 o 3 1.2 times the amount required for complete reaction theory; control the volume concentration of gas in the pre-oxidation roaster to 30%; the residence time of pre-oxidation slag powder...

Embodiment 3

[0100] Device structure is the same as embodiment 1;

[0101] The iron grade of the iron tailings used is TFe 15.86%, containing SiO by mass percentage 2 45%, method is the same as embodiment 1, and difference is:

[0102] (1) Crushing and grinding the iron tailings to a particle size of -0.038mm accounts for 70% of the total mass;

[0103] (2) Control the temperature of the material at the outlet of the Venturi dryer 5 to be 140°C; the solid material is preheated to 500°C in the second cyclone preheater 7;

[0104] (3) The pre-oxidation roasting temperature is 700°C; the residence time of the material entering the pre-oxidation roaster in the pre-oxidation roaster is 10min;

[0105] (4) The reduction roasting temperature is 600°C; 2 / CO and Fe in oxide slag powder 2 o 3 1.3 times the amount required for complete reaction theory; control the volume concentration of gas in the pre-oxidation roaster to 20%; the residence time of pre-oxidation slag powder in the reduction r...

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Abstract

The invention discloses a device and method for extracting iron from iron tailings through suspension roasting. The device comprises a feeding bin, a venturi dryer, a pre-oxidation suspension roastingfurnace, a suspension reduction roasting furnace, a collecting bin, a dry magnetic separator, a first-stage ore grinding machine, a first-stage low-intensity magnetic separator, a second-stage ore grinding machine, a second-stage low-intensity magnetic separator and an induced draft fan. The method comprises the following steps of (1), finely grinding the iron tailings; (2), conveying the ore fines to the vnturi dryer; (3), mixing and dehydrating combustion flue gas and ore fines in the venturi dryer; (4), preheating the ore fines and feeding the ore fines into the pre-oxidation suspension roasting furnace; (5), pre-oxidizing and roasting in a suspension state, and then feeding into the suspension reduction roasting furnace; (6), carrying out reduction roasting in a suspension state; (7),cooling and then feeding into the collecting bin; and (8), carrying out first-stage ore grinding and first-stage low-intensity magnetic separation after dry magnetic separation, and then carrying outsecond-stage ore grinding and second-stage low-intensity magnetic separation. The device and the method have the advantages of high heat and mass transfer efficiency, high production continuity, hightreatment capacity, high adaptability, easiness in realizing large-scale industrial production and the like.

Description

technical field [0001] The invention belongs to the technical field of ore dressing, and in particular relates to a device and method for iron tailings suspension roasting and iron extraction. Background technique [0002] Iron tailings in iron ore concentrators are generally composed of flotation tailings and magnetic separation tailings, with fine particle size and weak magnetism; iron minerals in iron tailings are mostly siderite, limonite and fine-grained hematite Iron minerals exist, and such iron minerals are difficult to recover through traditional beneficiation methods such as magnetic separation and flotation. A large amount of iron tailings stockpiles not only pollutes the environment, causes serious loss of metallic iron, and wastes iron ore resources, but also has the risk of tailings dam failure. Therefore, how to efficiently recover iron from iron tailings, reduce waste of resources, and reduce environmental pollution is of great significance to promote clean ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B02C21/00B04C9/00B03C1/30C22B1/02
CPCB02C21/00B03C1/30B04C9/00C22B1/02
Inventor 袁帅韩跃新肖汉新李艳军高鹏孙永升
Owner 上海逢石科技有限公司
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