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Classification friction charging method and device

A technology of friction charging and charging, which is applied in the field of electric separation, can solve problems such as 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: 2017-06-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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

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Embodiment 1

[0027] A stepwise friction charging method, in which 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 feeding pipe, the diameter of the overflow pipe, the cone angle and the overflow The insertion depth of the tube decreases sequentially, and the cone ratio increases sequentially, forming a cyclone type friction charge group. The dried coarse and fine mixed materials are driven by wind to form a gas-solid two-phase flow, which is fed into the cyclone-type friction charger group from the feeding pipe of the first cyclone-type friction charger. Under the grading action of the electric unit, the material is divided into three narrow-grained grades, and friction charging is carried out at the same time; the fine mud that is difficult to charge is discharged from the overflow pipe of the final cyclone-type friction charger, and enters the dust collector for recove...

Embodiment 2

[0033] A stepwise friction charging method, the basic principle is the same as that of Embodiment 1, the difference is that the cyclone type friction charging device group 2 is composed of two cyclone type friction charging devices connected 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 turn; the cone ratio increases in turn; the material is divided into two a narrow grade.

[0034] A hierarchical friction charging device, the basic structure of which is the same as that of Embodiment 1, the difference being that the cyclone type friction charging device group 2 is composed of two cyclone type friction charging devices connected 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, respectively 3...

Embodiment 3

[0036] A stepwise friction charging method, the basic principle is the same as that of Embodiment 2, the difference is that, from the beginning to the end, the cone angle of the cyclone-type friction charging device is constant, and the inner diameter, feeding pipe diameter, overflow pipe diameter, overflow pipe diameter, etc. The insertion depth of the flow tube decreases sequentially; the cone ratio increases sequentially; the material is divided into two narrow particle grades.

[0037] A graded friction charging device, the basic structure is the same as that of Embodiment 2, the difference is that, from the beginning to the end, the cone angle of the cyclone type friction charging device is 20°; the inner diameter decreases successively, respectively 300mm and 150mm; the caliber of the feeding pipe decreases successively, respectively 47×60mm 2 and 22×22mm 2 The diameter of the overflow pipe decreases in order, respectively 75mm and 32mm; the insertion depth of the overf...

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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 separation. Background technique [0002] Electro-separation is a type of separation technology that uses the electrical difference 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 for realizing electroseparation separation, and it is also the main content of electroseparation research. There are various ways to charge materials, including corona charging, contact charging, compound field charging, electrostatic induction charging and friction charging, among which friction charging can not only realize the charging between conductor materials, but also Realizing charging between non-conductor materials is a charging method with g...

Claims

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Application Information

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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