An enhanced separation method for complex iron ore based on precise regulation of ore phase segmentation

A complex technology for iron ore, applied in the field of enhanced separation of complex iron ore, to achieve the effects of easy control of product properties, reduced magnetic agglomeration, and reduced entrainment

Active Publication Date: 2022-05-17
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the above problems in the processing technology of the existing complex and refractory iron ore, the present invention provides an enhanced separation method for complex iron ore based on precise control of ore phase segmentation

Method used

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  • An enhanced separation method for complex iron ore based on precise regulation of ore phase segmentation
  • An enhanced separation method for complex iron ore based on precise regulation of ore phase segmentation
  • An enhanced separation method for complex iron ore based on precise regulation of ore phase segmentation

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Complex iron ore has an iron grade of 35.20% and contains SiO by mass 2 43.11％；

[0056] Processes such as Figure 1 shown;

[0057] The complex iron ore is crushed by a crusher to a particle size of 2 to 15mm, and then the part of the mill is milled to a particle size of -0.074mm, accounting for 80% of the total mass, and the ore powder is obtained;

[0058]Adopt the pre-oxidation roaster with a burner and an air inlet at the bottom, the lower part of the pre-oxidation roaster is provided with an inlet, the upper part is connected with the cyclone separator through the material channel, and the exhaust port of the cyclone separator is connected with the induced draft through the pipe; the combustion flue gas is passed into the pre-oxidation roaster by the combustion of natural gas into the burner, and at the same time, under the condition of starting the induced draft, the air is introduced into the pre-oxidation roaster, and the ore powder is transported from the lower p...

Embodiment 2

[0064] Complex iron ore has an iron grade of 33.10% and contains SiO by mass 2 45.6％；

[0065] The method is the same as example 1, the difference is that:

[0066] (1) The part of the mill that is grinded to a particle size of -0.074mm accounts for 60% of the total mass;

[0067] (2) The pre-oxidation roasting temperature is 680 °C; the residence time of the solid materials in the pre-oxidation roasting furnace is 5min;

[0068] (3) The reduction roasting temperature is 550 °C and the reducing gas, and the amount of the reducing gas is based on the CO / H required for the complete reaction of the reducing roasting 2 The theoretical amount is 1:2 times; the volume flow ratio of nitrogen and reducing gas in the regenerative reduction roaster is 3:1; the residence time of the solid material in the regenerative reduction roasting furnace is 20min;

[0069] (4) The reduced material is cooled to 250 °C and discharged; the residence time of the reduced material in the primary cooling cycl...

Embodiment 3

[0073] Complex iron ore has an iron grade of 29.87% and contains SiO by mass 2 48.4％；

[0074] The method is the same as example 1, the difference is that:

[0075] (1) The part of the mill that is fine to a particle size of -0.074mm accounts for 50% of the total mass;

[0076] (2) The pre-oxidation roasting temperature is 700 °C; the residence time of the solid materials in the pre-oxidation roasting furnace is 2min;

[0077] (3) The reduction roasting temperature is 600 °C and the reducing gas, and the dosage of the reducing gas is based on the CO / H required for the complete reaction of the reduction roasting 2 The volume flow ratio of nitrogen and reducing gas in the regenerative reduction roaster is 1:1; the residence time of the solid material in the regenerative reduction roaster is 10min;

[0078] (4) The reduced material is cooled to 300 °C and discharged; the residence time of the reduced material in the primary cooling cyclone separator is 2min;

[0079] (5) The residenc...

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Abstract

An intensified sorting method for complex iron ores based on accurate control of ore phase segmentation, which is carried out in the following steps: (1) crushing and grinding the complex iron ores; (2) transporting the ore powder to a pre-oxidation roaster , carry out pre-oxidation roasting in a suspension state, and then enter the cyclone separator; (3) After the pre-oxidation roasting material is separated by a cyclone, it is discharged into the regenerative reduction roaster, and the reduction roasting is carried out in a suspension state; (4) The reduced material enters the first-stage Cooling cyclone separator, nitrogen cooling to 200~300°C; (5) Cooling and reducing materials enter the secondary cooling cyclone separator through the flow seal valve, and re-oxidize with air, and the temperature drops to ≤100°C; (6) Carry out weak Magnetic separation to obtain iron concentrate. The method of the invention has simple flow, low energy consumption and cost per unit of processing capacity, easy control of product properties, and easy realization of large-scale equipment.

Description

Technical field [0001] The present invention belongs to the field of mineral processing technology, specifically relates to a complex iron ore enhanced sorting method based on the precise regulation of mineral phase segmentation. Background [0002] At present, a large number of low-grade complex difficult-to-bene iron ore resources have not been effectively utilized on a large scale, the iron grade of this type of ore is low, the iron minerals are embedded with fine grain size, and the physical phase of iron minerals is complex (mainly hematite, echite, limonite, lyrite and magnetite, etc.), to achieve the effective utilization of complex refractory iron ore resources, which is of great significance to alleviate the shortage of iron ore resources. [0003] Patent CN104593588 discloses a method of roasting poor iron ore in a rotary kiln, proposing to use iron ore with an iron content of about 40% as a raw material, using a rotary kiln to roast and recover the iron contained ther...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03C1/015B02C21/00B04C5/26C22B1/10
CPCB03C1/015B02C21/00B04C5/26C22B1/10Y02P10/143
Inventor 高鹏袁帅张琦韩跃新李艳军孙永升
Owner NORTHEASTERN UNIV LIAONING
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