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A stepwise friction charging method and device

A technology of friction charging and charging, which is applied in the field of electric separation, can solve the problems of increased cost dehydration, unfavorable friction charging, fine mud dispersion, etc., to achieve improved friction charging effect, good friction charging effect, and improved separation efficiency effect

Active Publication Date: 2019-02-05
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Before materials are selected, they need to go through grinding to dissociate useful minerals and gangue minerals. Grinding is a very complicated process. Grinding products are often mixed particles with a wide range of particle sizes. At present, there is no effective grinding of narrow particles. The method and equipment of high-grade products, and many tribo-charging studies have shown that the larger the particle size range of the material, the more unfavorable it is to tribo-charging, especially when coarse and fine particles are mixed and fine mud is dispersed.
Since electric separation is a dry beneficiation method, traditional wet grinding and classification are difficult to apply to electric separation or need to increase the cost of dehydration and drying
The cyclone type friction charger is a kind of air flow friction charger, which not only has the charging effect, but also can be classified. It can be used with dry grinding, but when it is used for material friction charging, the charging effect is poor , and the fine-grained material will be spilled and it is difficult to achieve charging

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0027] A graded friction charging method. Three cyclone-type friction chargers are connected in series, from the beginning to the end, the inner diameter of the cyclone-type friction charger, the diameter of the feed pipe, the diameter of the overflow pipe, the cone angle and the overflow The insertion depth of the tube decreases successively, and the cone ratio increases successively, forming a cyclone-type friction charger group. The coarse and fine mixed materials after drying are driven by wind to form a gas-solid two-phase flow. The feed pipe of the first cyclone-type friction charger is fed into the cyclone-type friction charger unit. Under the grading action of the electrical unit, the material is divided into three narrow-grained grades, and friction charging is carried out at the same time; the hard-to-charge fine mud is discharged from the overflow pipe of the cyclone-type friction charger at the end, and enters the dust collector for recovery and removal The air afte...

Embodiment 2

[0033] A graded friction charging method. The basic principle is the same as that of Embodiment 1. The difference is that the cyclone type friction charger group 2 is composed of two cyclone type friction chargers in series. From the beginning to the end, the inner diameter, cone angle and overflow pipe insertion depth of the cyclone-type friction charger remain unchanged, the feed pipe diameter and overflow pipe diameter decrease in sequence; the cone ratio increases in sequence; the material is divided into two A narrow grain level.

[0034] A hierarchical friction charging device, the basic structure is the same as that of the first embodiment, the difference is that the cyclone type friction charging device group 2 is composed of two cyclone type friction charging devices in series. From the beginning to the end, the inner diameter, cone angle and insertion depth of the overflow tube of the cyclone-type friction charger remain unchanged, respectively 350mm, 20° and 35mm; the ...

Embodiment 3

[0036] A graded friction charging method. The basic principle is the same as that of Example 2. The difference is that the cone angle of the cyclone-type friction charging device remains unchanged from the beginning to the end, and the inner diameter, the diameter of the feed pipe, the diameter of the overflow pipe, and the overflow The insertion depth of the flow tube decreases successively; the cone ratio increases successively; the material is divided into two narrow grain levels.

[0037] A graded friction charging device. The basic structure is the same as that of Example 2. The difference is that the cone angle of the cyclone-type friction charging device remains the same from the beginning to the end, which is 20°; the inner diameter is successively reduced to 300mm. And 150mm; the diameter of the feed pipe decreases successively to 47×60mm 2 And 22×22mm 2 ; The diameter of the overflow pipe decreases successively to 75mm and 32mm; the insertion depth of the overflow pipe d...

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Abstract

The invention discloses a classification friction charging method and device. The classification and friction charging effect of a cyclone type friction charger is used; materials are pneumatically driven to pass through a cyclone type friction charger set with multistage separation particle size gradients in a wind path direction; the materials with a wide particle size range are divided into multiple narrow-particle materials for friction charging, so that the influence on the friction charging by coarse-fine particle mixing and fine silt dispersion in the friction charger can be eliminated, the problem of difficult charging of fine particles in the cyclone type friction charger also can be prevented, the friction charging of the materials is facilitated, and the electric quantity is increased; and meanwhile, as the particle size of the narrow-particle materials is uniform, the sorting efficiency in subsequent static electricity sorting is improved.

Description

Technical field [0001] The invention relates to a graded friction charging method and device, belonging to the technical field of electric selection. Background technique [0002] Electrical separation is a sorting technology that uses the electrical differences of substances to separate, purify, and classify. It has the advantages of high efficiency, energy saving and environmental protection, and has been widely used in mineral separation and agricultural product separation. Material charging is the basic condition to realize the separation of electric separation, and it is also the main content of electric separation research. There are many ways to charge materials, including corona charging, contact charging, compound field charging, electrostatic induction charging and friction charging. Among them, friction charging can not only realize the charging between conductor materials, but also Realizing charging between non-conducting materials is a very potential charging metho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03C7/02
CPCB03C7/02
Inventor 何东祥戴惠新王琳杜五星赵泓铭饶兵
Owner KUNMING UNIV OF SCI & TECH