A kind of joint beneficiation method for processing fine-grained iron ore

Abstract

The invention discloses a combined beneficiation method for treating micro-fine grain disseminated iron ores. The combined beneficiation method comprises the following steps of (a) performing first-stage grinding and classification on the iron cores to obtain overflow ore pulp and classification sand setting ores and returning the classification sand setting ores to first-stage grinding and classification; (b) performing low-intensity magnetic separation on the overflow ore pulp obtained in the step (a) to obtain iron ore concentrate and low-intensity magnetic separation tailings; (c) performing strong magnetic separation on the low-intensity magnetic separation tailings to obtain first-stage high-intensity magnetic separation concentrate and high-intensity magnetic separation tailings; (d) performing second-stage grinding and classification on the first-stage high-intensity magnetic separation concentrate obtained in the step (c) to obtain overflow ore pulp and classification sand setting ores and returning the classification sand setting ores to second-stage grinding and classification; (e) performing strong magnetic separation on the overflow ore pulp obtained from the step (d) to obtain second-stage high-intensity magnetic separation concentrate and high-intensity magnetic separation tailings; and (f) performing separation on the second-stage high-intensity magnetic separation concentrate obtained in the step (e) by using a positive flotation technology to obtain flotation concentrate and flotation tailings. The micro-fine grain red iron ores are subjected to separation by the combined beneficiation method, the iron operation recycling rate is above 85%, and the iron grade of total concentrate is above 64%.

Description

technical field [0001] The invention relates to an iron ore beneficiation method, in particular to a combined ore beneficiation method for processing fine iron ore. Background technique [0002] my country's iron ore resources are rich in lean ore and less in rich ore, and its main characteristics are "poor", "fine" and "miscellaneous", and the average iron grade is low. With the rapid development of my country's iron and steel industry, the demand for finished iron ore is increasing day by day, and the amount of easy-to-select iron ore that can be mined and utilized is gradually decreasing. It's getting finer. Fine-grained refractory iron ore resources account for more than 20% of my country's iron ore resource reserves, among which the -30μm iron ore in Hunan Qidong is greater than 95%, the Hunan Dongkou iron ore -19μm is greater than 95%, and the Ningxiang-style oolitic hematite The intercalation particle size even reached -13μm, greater than 95%. This part of iron ore r...

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Problems solved by technology

The main problems of the above-mentioned mineral processing technology are: (1) the flocculation desliming process consumes a lot of water in industrial production, the consumption of desliming agents is large, the treatment of desliming mud is difficult, and the cost of mineral processing is high; (2) the use of conventional strong magnetic The separation process (such as vertical ring strong magnetic separator, imitation Jones flat ring strong magnetic separator, etc.) has a poor recovery effect on -25μm fine-grained hematite, and the recovery rate of strong magnetic iron separation is less than 50%; Iron silicate-type gangue minerals, poor separation efficiency by reverse flotation process, low grade iron in flotation concentrate

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