Steel-ball-free ore grinding method

Abstract

The invention discloses a steel-ball-free ore grinding method. The steel-ball-free ore grinding method comprises the following steps: ore with the grinding particle size P80 of 2.5-3.0 mm is fed into an ore grinding machine, and first-stage ore grinding is carried out; an ore grinding medium of a mixed ceramic section is loaded into the ore grinding machine, and the mixed ceramic section comprises cylindrical ceramic sections with different lengths and different diameters; the P80 of an overflow product of a classifier is controlled to be 0.5-0.3 mm, and if the ore dressing granularity requirement is met, only first-stage ore grinding is carried out; and if the ore dressing granularity requirement is not met, second-stage ore grinding is carried out, and during second-stage ore grinding, an ore grinding medium mixed with ceramic balls is loaded into the ore grinding machine. According to the steel-ball-free ore grinding method, the mixed ceramic section is used as the ore grinding medium, crushing is carried out mainly by line contact and supplemented by surface contact, efficient grinding can be carried out in the ore grinding process, and the over-crushing generation rate of ore grinding products can be reduced; and besides, an ore grinding section can be a one-section ore grinding process or a multi-section ore grinding process, and the ore grinding machine mainly adopts a horizontal ball mill, so that the ore grinding requirements of different ores and different metal disseminated particle sizes can be met.

Description

technical field [0001] The invention relates to the field of ore grinding in ore dressing, in particular to a steel ball-free ore grinding method. Background technique [0002] Grinding technology is one of the essential processes in industries such as non-ferrous metals, ferrous metals and cement. The grinding process crushes metallic ore or non-metallic ore into different particle sizes, which needs to be realized by adding steel balls in the grinding machine. Regardless of the semi-autogenous grinding process, coarse grinding, or fine grinding process, steel balls are used as the grinding medium, but the size of the steel balls used is different. [0003] The grinding process usually includes one-stage grinding process, two-stage grinding process and re-grinding process according to different requirements for grinding particle size and discharge particle size. When the requirements of the input grinding particle size are the same, the finer the ore discharge fineness of...

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Problems solved by technology

[0004] The Chinese patent with the application publication number CN 105855000 A discloses a grinding method using ceramic media in a tower mill. The grinding method is to select a ceramic body with a certain hardness and a certain density as the grinding medium, with a certain filling rate. Filling in the tower mill to grind the material can solve the shortage of high chromium steel balls as the grinding medium, and can achieve the purpose of high-efficiency grinding and cost saving. However, the plan only discloses the ceramic body as In the case of ceramic balls, ceramic balls are commonly used grinding media, mainly for point contact, and the crushing effect is better, but it is easy to cause over-crushing, and can only be used in vertical tower mills

The Chinese patent whose application publication number is CN 104888904 A discloses a double-spherical hexagonal prism grinding medium. The shape of the medium used is a double-spherical hexagonal prism. It is mainly used in the grinding process of metal ore and the preparation of other narrow and fine-grained materials. It solves the serious problem of over-grinding (less than or equal to 10um particles) in the grinding process of spherical grinding media, and can obtain narrower grades through grinding , Grinding products with slightly uniform particle size, but the grinding efficiency in this scheme is relatively low

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