Tailing treatment process in poor magnetic iron ore beneficiation process

Abstract

The invention relates to a tailing treatment process in a poor magnetic iron ore beneficiation process. The tailing treatment process comprises the following steps: a poor magnetic iron ore is fed in a high-pressure grinding roller and a screening machine for a closed-circuit grinding operation; a screened product of the screening machine is fed to a roughing magnetic separator; and a concentrate thereof is fed to a subsequent operation. The tailing treatment process is characterized by further comprising the following steps: a tailing of the roughing magnetic separator is fed to a concentration cyclone; a underflow product of the concentration cyclone is fed to a tailing dehydration sieve; an overflow product of the concentration cyclone, a screened product of the dehydration sieve and a tailing in a subsequent separation operation are all fed to a tailing concentrator for a concentration operation; a underflow product of the tailing concentrator is fed to a tailing press filter for filtration; and an unscreened product of the dehydration sieve and a filter cake of the tailing press filter are fed to a tailing dry discharge belt conveyer for conveying to a tailing storage yard or a tailing pond for storage. The tailing treatment process has the following advantages: the dry discharge treatment is performed for a thick-particle tailing in nearly one half of the separation process, and the rest tailing is concentrated and filtered to realize the tailing dry discharge, so that the tailing treatment process in the poor magnetic iron ore beneficiation process is comprehensively optimized.

Description

technical field [0001] The invention belongs to the technical field of iron ore beneficiation, in particular to a process for treating tailings in the beneficiation process of lean magnetite ore. Background technique [0002] At present, most metal mine tailings in China are sent to tailings ponds by hydraulic transportation and stored in the traditional way, which not only causes serious damage to the environment, increases safety hazards, but also occupies a large amount of land, increasing mine investment and tailings pond operations. Cost has become a key issue restricting the sustainable development of mines. Especially the discharge of iron mine tailings, due to the large discharge, the service life of the tailings pond is shortened, and there is also the danger of dam collapse. In the face of many disadvantages of tailings discharge, high-concentration stockpiling of tailings has been continuously developed as a new tailings treatment technology in recent years, whic...

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Problems solved by technology

[0004] 1. The high-concentration tailings transportation mainly adopts the high-efficiency transformation of the original thickener, or uses a high-efficiency thickener to make the underflow concentration of the thickener reach more than 45%, and then transports it to the tailings pond. This method only reduces The loss of water saves operating costs, but the above problems have not been fundamentally solved

[0005] 2. Although the discharge of paste can solve the problems of water utilization and environmental protection, the requirements for the particle size composition of tailings are relatively strict, and the content of less than 20 microns must reach more than 15%. This level can prevent water seepage, so not all tailings All are applicable, especially the current application of iron tailings is still relatively small

At present, there are three main tailings dry discharge processes: "thickener + cyclone + filter", "thickener + filter" and "cyclone + thickener + dewatering screen". The main disadvantages are: due to this The three processes are relatively independent, and they deal with full-process tailings or full-size tailings. For large-scale mineral processing enterprises, the supporting equipment for concentration, dehydration and filtration is large-scale, which greatly increases investment and subsequent operating costs. Therefore, at present, there are relatively few large-scale mineral processing enterprises at home and abroad using this process, and generally small and medium-sized mineral processing enterprises with a tailings processing capacity of less than 150 tons / hour have adopted this process.

The main defects in the tailings treatment process of this lean magnetite beneficiation process at present are: 1. If the tailings are directly pumped to the tailings storage after being concentrated, it will not only easily cause adverse effects on the environment, but also increase the Potential safety hazards, and a large amount of land occupation, increased mine investment and tailings pond operating costs; 2. If the tailings are first concentrated by a thickener, then the tailings are filtered, and finally dry-drained by a belt conveyor, although it is solved However, since the tailings production rate of subsequent sorting operations generally exceeds 60% of the total ore processing capacity, the amount of tailings that needs to be concentrated and filtered is huge, which will inevitably lead to high investment and operating costs for the tailings concentration and filtration system. , so at present large and extra-large iron ore beneficiation enterprises have rarely adopted

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