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A kind of flotation method of fine particle mineral powder

A fine particle and flotation technology, applied in flotation, solid separation, etc., can solve the problems of large equipment investment and production operation costs, affecting the efficiency of micro-bubble flotation, and the slow rise of micro-bubbles, etc., to achieve high-efficiency product Capturing, reducing fixed investment, quick buffer effect

Active Publication Date: 2021-01-12
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In order to obtain smaller bubbles, the traditional technology often needs to use high energy consumption methods such as decompression and outfield, and the equipment is relatively complicated, requiring a large amount of initial equipment investment and production operation costs
Moreover, when conventional flotation columns are used for microbubble flotation, the rising speed of microbubbles is slow, it is difficult to maintain stability during the rising process, and it is easy to break and coalesce, which greatly affects the flotation efficiency of microbubbles.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] right d 50 =10μm ore powder was used for flotation experiments, in which the gas flow rate of the dispersed phase was 30mL / min, the through-hole velocity was 0.212m / s, the slurry flow rate of the continuous phase was 100mL / min, the linear velocity was 0.5m / s, and the average pore size of the microporous membrane was 5μm, the porosity is 90%. The gas-liquid mixed pulp is separated in the micro-separation column, in which the height of the slender column is 25mm and the diameter is 10mm; the height of the buffer platform is 2.5mm and the diameter is 50mm. The average residence time of the gas-liquid two-phase in the separation column was 3.17s, and the floating product was taken for 10 minutes, and post-treatment was performed to measure the purity of calcium fluoride in the final product to reach 99.39%, and the recovery rate was 46.85%.

Embodiment 2

[0024] right d 50 =60μm ore powder for flotation experiment, in which the gas flow rate of the dispersed phase is 100mL / min, the passing speed is 2.12m / s, the flow rate of the continuous phase slurry is 100mL / min, the linear velocity is 5m / s, and the average pore size of the microporous membrane is 20μm , The porosity is 95%. The gas-liquid mixed pulp is separated in a micro flotation column, in which the slender column is 180mm in height and 10mm in diameter; the buffer platform is 18mm in height and 50mm in diameter. The average residence time of the gas-liquid two-phase in the separation column was 14.83s, and the floated product was taken for 10 minutes, and after post-treatment, the purity of calcium fluoride in the final product was measured to be 92.24%, and the recovery rate was 72.23%.

Embodiment 3

[0026] right d 50 =1μm ore powder for flotation experiment, in which the gas flow rate of the dispersed phase is 10mL / min, the passing speed is 0.8m / s, the slurry flow rate of the continuous phase is 100mL / min, the linear velocity is 2m / s, and the average pore size of the microporous membrane is 1μm , The porosity is 75%. The gas-liquid mixed pulp is separated in a micro flotation column, in which the slender column is 50mm in height and 10mm in diameter; the buffer platform is 5mm in height and 60mm in diameter. The average residence time of the gas-liquid two-phase in the separation column was 9.85s, and the floated product was taken for 10 minutes, and post-treatment was performed to measure the purity of calcium fluoride in the final product to reach 89.26%, and the recovery rate was 78.02%.

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Abstract

The invention belongs to the technical field of ore dressing, and especially relates to a flotation method suitable for fine-particle mineral powder. The flotation method comprises the steps: gas is dispersed through a microporous membrane and sheared by an ore pulp flowing in a confined space to form a microbubble group, particles with different surface properties in the ore pulp are selectivelyadsorbed to the surfaces of bubbles and then flow into a micro separation column, air flotation separation is completed within a certain retention time, and flotation substances are captured from thetop of the column. The floatation method provided by the invention has excellent trapping efficiency and selectivity on fine-grained mineral powder with the particle size of 74 microns or below, whichis difficult to trap under the traditional flotation condition, and can also effectively reduce the influence of micro-bubble coalescence. According to the flotation technology, continuous operationof fine particle flotation is easy to achieve, the gas utilization efficiency can be effectively improved, the size of fixed equipment is reduced, the investment is reduced, and the operation space issaved.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a flotation method suitable for fine particle mineral powder. Background technique [0002] Flotation is the most commonly used and effective method among many beneficiation methods, and it can also be applied to sewage treatment, solid waste recycling, deinking and other fields. Utilizing the difference in hydrophilicity and hydrophobicity of the surface of different component particles, gas is introduced during the flotation process to achieve selective contact with the surface of hydrophobic particles, complete the capture of hydrophobic particles, and finally collect air bubbles from the upper part to obtain flotation products, realizing different Separation between surface properties of solid particles. The efficiency of the flotation process is related to the probability of particle-bubble collision, particle-bubble attachment and particle-bubble det...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03D1/24B03D1/02
CPCB03D1/025B03D1/245
Inventor 吕阳成叶璐
Owner TSINGHUA UNIV
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