Method for efficiently recovering iron ore from gold extraction tailings of oxidized ore containing gold and iron

Abstract

The invention relates to a method for efficiently recovering iron ore from gold extraction tailings of oxidized ore containing gold and iron, which belongs to the field of ore dressing and comprises the following steps of: (1) dispersing ore pulp, and adding a cosolvent or a dispersing agent for dispersing; (2) performing weak magnetic roughing to obtain magnetite rough concentrate and tailings; (3) performing high-gradient magnetic separation roughing to obtain limonite rough concentrate I and tailings; (4) externally adding micro-fine particle magnetite for size mixing; (5) performing high-gradient magnetic separation scavenging to obtain limonite rough concentrate II and tailings; (6) performing weak magnetic concentration: combining and mixing the magnetite rough concentrate with the limonite rough concentrate I and II to obtain magnetite concentrate and tailings; (7) grinding and dissociating the tailings in the step (6); and (8) performing high-gradient magnetic separation concentration: concentrating the tailings obtained in the step (7) to obtain limonite concentrate and middlings, and combining the middlings with the tailings obtained in the step (5) to serve as total tailings; according to the method, the micro-fine particle magnetite and the limonite can be effectively recycled.

Description

technical field [0001] The invention relates to a method for efficiently recovering iron ore from gold-bearing and iron oxide ore extracting gold tailings, belongs to the field of mineral processing, and relates to the technical field of magnetic mineral separation. Background technique [0002] At present, magnetic separator beneficiation is the main beneficiation method of fine-grained iron minerals. According to the different magnetic induction intensity, there are weak magnetic separation and strong magnetic separation (high gradient magnetic separator). Due to the large difference in the specific susceptibility coefficients of strong magnetic iron minerals and weak magnetic iron minerals, the requirements for magnetic induction of magnetic separators are very different. According to the development level of magnetic separators at the present stage and the physical properties of magnetic iron minerals, strong magnetic iron minerals can only be separated by weak magnetic ...

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Problems solved by technology

According to the development level of magnetic separators at the present stage and the physical properties of magnetic iron minerals, strong magnetic iron minerals can only be separated by weak magnetic separators, mainly for magnetite, titanium magnetite, maghemite, iron tip Spar, etc., the effective magnetic separation particle size range is the diameter of magnetic iron minerals d≥20um, and the recovery rate of strong magnetic iron minerals with a diameter of <20um is low, because when the diameter of strong magnetic iron minerals is <20um, the specific magnetization The coefficient drops sharply, and the magnetic force of weak magnetic separator cannot offset the pulling force of ore pulp; weak magnetic iron minerals can only be separated by high gradient magnetic separator, mainly for hematite, limonite, goethite and siderite etc., its effective magnetic separation particle size range is magnetic iron mineral diameter d≥10um, for weakly magnetic minerals with diameter <10um, the recovery rate is extremely low, because the magnetic force of high gradient magnetic separator cannot offset the pulling force of ore pulp ; For the beneficiation of strong magnetic iron minerals, high gradient magnetic separators cannot be used, because the magnetic separation mechanism of strong magnetic iron minerals and weak magnetic iron minerals is different, and strong magnetic iron minerals will block the high gradient magnetic separator. The magnetic medium space prevents the pulp from passing through the magnetic separator and hinders the beneficiation process; the specific magnetic susceptibility coefficients of various minerals of the same type of magnetic iron minerals are also different, and the required matching magnetic induction intensity is also different within the range of their effective recovery particle size. Therefore, when the same magnetic separator is used for magnetic separation, it is difficult to effectively recover some iron minerals; at the same time, when dealing with finely ground ores with large mud content, there is non-selective flocculation between particles. It is difficult to obtain high-grade iron ore concentrate products with advanced magnetic separators, especially for iron oxide ores with strong flocculating agents (such as lime, flocculants, etc.) in the pulp, such as gold and iron oxide ores. It is more difficult to achieve effective separation and recovery of gold-bearing iron ore tailings

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