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Compound classification method and equipment for ground ore product

A classification method and technology of mineral products, applied in the direction of chemical instruments and methods, solid separation, wet separation, etc., can solve the problems that the equipment has not been widely popularized and applied, so as to reduce clogging and wear, improve classification efficiency, and The effect of reducing the pulverization rate

Active Publication Date: 2013-11-27
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These improvement measures have a certain effect in improving the efficiency of the spiral classifier, but in view of some problems in the equipment structure and operation stability, the above equipment has not been widely promoted and applied

Method used

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  • Compound classification method and equipment for ground ore product
  • Compound classification method and equipment for ground ore product
  • Compound classification method and equipment for ground ore product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Example 1: A tin ore concentrator that processes 120 tons of ore a day uses a ￠1200 single-screw classifier and a ￠1500×3000 grinding machine for closed-circuit grinding and grading. The grinding fineness is -200 mesh, accounting for 75%. The actual measurement of the spiral classifier The classification quality efficiency calculated by 0.074mm is 38%, and the over-crushing rate (-10μm) of the classification overflow is 32%, and the subsequent sorting operation indicators are not ideal. The grading system is retrofitted with the method and apparatus of the present invention.

[0022] The compound classification method for grinding products is: combine the vibratory screening method with the spiral classification method to carry out compound classification for the grinding products. The sieve surface is soaked in the spiral grading overflow liquid, and the grinding products are vibratingly screened through the double-layer vibrating screen to obtain the on-screen mater...

Embodiment 2

[0026] Example 2: A copper ore concentrator that processes 1,500 tons of ore a day uses a ￠2000 double-screw classifier and a ￠2700×3600 grinding machine for closed-circuit grinding and grading in the first stage of grinding operation. The degree of -200 mesh accounts for 60%, the measured mass efficiency of the spiral classifier according to 0.3mm is 50%, the mass efficiency of the classification according to 0.074mm is 32%, and the over-grinding rate (-10μm) of the classification overflow is 26%. .

[0027] The grading system is modified with the method and equipment of the present invention, and the method and device used are the same as those in Example 1. That is, increasing the angle of the original grader to 15 0 , move outwards 1000mm, add the chute vibrating screen of the present invention between the grinding machine and the classifier, the length, width and height of the vibrating screen are 1200 × 800 × 1000mm, and the upper sieve of the vibrating screen adopts ...

Embodiment 3

[0029] Example 3: An iron ore dressing plant that processes 1,000 tons of ore a day uses the SLFS1500 screening spiral compound classifier of the present invention and the ￠2100×3000 ore grinding machine to perform closed-circuit grinding and grading in the first stage of grinding operation, and the ore discharge granularity is 0.4mm. The grinding fineness is -200 mesh, accounting for 55%. The specific method and device are the same as in Example 1.

[0030] The length, width and height of the chute vibrating screen of the screening spiral compound classifier are 1000×750×900mm. The upper sieve of the vibrating screen adopts a polyurethane sieve plate with an aperture of 6mm, and the lower layer adopts a wear-resistant stainless steel screen with an aperture of 0.45mm. The vibration frequency of the vibrator is 1480 times / min. The ore discharge chute of the vibrating screen and the feeding port of the spiral classifier are flexibly connected by rubber material. The spiral c...

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Abstract

The invention relates to a method and equipment for compound classification of ore grinding products, belonging to the technical field of mineral processing. Combining vibratory screening with spiral classification method, the grinding products are vibratingly screened through the double-layer chute vibrating screen to obtain the on-screen material and the under-screen material, and then the on-screen material is directly sent to the spiral classifier for classification. The material is returned to the grinding machine for regrinding, and the fine material overflows from both sides of the classification box and is combined with the material under the screen to be sent to the subsequent sorting operation. The chute vibrating screen machine is located on the side of the spiral classifier, and the tail end of the ore discharge chute is directly connected to the ore feeding port on the spiral classifier box body. The box body in the classifying area of ​​the spiral classifier is higher than the conventional box body height. It has the advantages of greatly reducing the anti-enrichment of fine-grained heavy minerals in sand settling or returning sand, closed-circuit grinding over-grinding and sand settling with less fineness, high classification efficiency, and direct closed-circuit with the grinding machine. For the transformation of existing grinding and classifying equipment, a new screening spiral compound classifier can also be manufactured to be used in conjunction with the grinding machine.

Description

technical field [0001] The invention relates to a rapid and high-efficiency composite classification method and equipment for coarse and fine particles of ore grinding products, belonging to the technical field of mineral processing. Background technique [0002] Grinding is an important process link in a concentrator, and the particle size distribution of the grinding product has a great influence on the subsequent sorting operations. The product discharged from the grinding is in the form of pulp with a wide range of particle sizes. Generally, it cannot directly enter the sorting operation. It needs supporting grading equipment to classify the coarse and fine particles. The coarse particle returns to the grinding machine for grinding, and the fine particle enters the subsequent secondary mill. The ore is re-grinded or directly entered into the sorting operation. At present, there are mainly three kinds of grading equipment supporting the grinding machine, one is a spiral ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B03B7/00B07B1/28B03B5/52
Inventor 周兴龙文书明龙泽毅王祥邹平
Owner KUNMING UNIV OF SCI & TECH
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