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A kind of pretreatment method for oolitic hematite grinding aid

An oolitic hematite and pretreatment technology, applied in solid separation and other directions, can solve the problems of increasing energy consumption and small yield, and achieve the effects of improving cooling speed, short treatment period and improving monomer dissociation degree.

Active Publication Date: 2021-08-17
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pretreatment part of this process is roasted in a gas-fired rotary kiln at a temperature of 500-550 °C for at least 1 hour, which only causes a small amount of fine cracks in the ore, and it is difficult to effectively dissociate the minerals in the subsequent grinding process, which not only increases energy consumption, and with little benefit

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] A pretreatment method for oolitic hematite grinding aid. The preprocessing method described in this embodiment is:

[0023] Step 1: Crush the oolitic hematite to a particle size of ≤2 mm, and then soak the crushed ore in water for 5-20 minutes.

[0024] Step 2: freezing the soaked ore in sequence with liquid nitrogen for 25-40 minutes and treating it in a water bath at 80-100°C for 3-5 minutes.

[0025] Step 3, drying treatment.

[0026] The oolitic hematite pretreated in this embodiment is ground by a ball mill: the pulp concentration is 50%, and the content of the particle size ≤ 0.074 mm after grinding increases by 2.66-2.84%.

Embodiment 2

[0028] A pretreatment method for oolitic hematite grinding aid. The preprocessing method described in this embodiment is:

[0029] Step 1: Crush the oolitic hematite to a particle size of ≤2 mm, and then soak the crushed ore in water for 10-25 minutes.

[0030] Step 2, freezing the soaked ore in sequence with liquid nitrogen for 30-45 minutes and treating it in a water bath at 80-100°C for 3-5 minutes.

[0031] Step 3, drying treatment.

[0032] The oolitic hematite pretreated in this embodiment is ground by a ball mill: the pulp concentration is 50%, and the content of the particle size ≤ 0.074mm after grinding increases by 2.74-2.90%.

Embodiment 3

[0034] A pretreatment method for oolitic hematite grinding aid. The preprocessing method described in this embodiment is:

[0035] Step 1: Crush the oolitic hematite to a particle size of ≤2 mm, and then soak the crushed ore in water for 15-30 minutes.

[0036] Step 2, freezing the soaked ore in sequence with liquid nitrogen for 15-30 minutes and treating it in a water bath at 80-100° C. for 3-5 minutes.

[0037] Step 3, drying treatment.

[0038] The oolitic hematite pretreated in this embodiment is ground by a ball mill: the pulp concentration is 50%, and the content of the particle size ≤ 0.074mm after grinding increases by 2.39-2.87%.

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Abstract

The invention relates to a pretreatment method for oolitic hematite grinding aid. The technical proposal is: crush the oolitic hematite to a particle size of ≤2 mm, and soak the crushed ore in water for 5-30 minutes. Then freeze the soaked ore with liquid nitrogen for 5-50 minutes and treat it in a water bath at 80-100°C for 3-5 minutes; Water bath treatment for 3 to 5 minutes, and then the ore treated in the water bath was frozen with liquid nitrogen for 5 to 50 minutes and water bath treatment at 80 to 100 ° C for 3 to 5 minutes was repeated for 1 to 3 times. Just after drying. The invention has the characteristics of no additional equipment, simple process, short cycle, environmental friendliness and good pretreatment effect, and can effectively improve the monomer dissociation degree of oolitic hematite in the subsequent grinding process, so that the particle size after grinding The content of ≤0.074mm is significantly improved.

Description

technical field [0001] The invention belongs to the technical field of pretreatment of oolitic hematite. Specifically relates to a pretreatment method for oolitic hematite grinding aid. Background technique [0002] Oolitic hematite is composed of oolitic grains, cement and detrital minerals. Oolitic grains are composed of hematite, collophosite and calcite and other minerals wrapped in layers in concentric rings, and the particle size of oolitic grains is 0.1mm to 1mm, mostly spherical or ellipsoidal. The composition of the annulus is complex. The oolitic hematite is in the form of very small strip-shaped grains overlapping and interlacing to form a sheet, and a large number of sheets form a ring, and the gap between the sheets is filled with gangue minerals. In the cement, the ferrous cement is disseminated and distributed, and a large number of fine gangues are mixed in it (Han Y, et al. Reduction process of high phosphorus olitichematite [J]. Advanced Materials Researc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03B1/00
CPCB03B1/00
Inventor 钱功明程翔宇蔡先炎周钰沣
Owner WUHAN UNIV OF SCI & TECH
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