Fine-fraction roasting iron ore full-sealing dry waste-discarding process

Abstract

The invention discloses a fine-fraction roasting iron ore full-sealing dry waste-discarding process. The process comprises the following steps that A, refractory iron ore powder with the particle size being -1mm is pelletized, subjected to magnetizing roasting through a rotary kiln, cooled to the temperature below 50 DEG C in a non-air contact manner, and then conveyed by a spiral conveyor to a dispersing device to be dispersed; B, the dispersed powder is fed into a spiral dry magnetic separator through the spiral conveyor, and then full-sealing dry waste pre-concentration and waste-discarding operation is conducted; and C, after full-sealing dry pre-concentration and waste-discarding is conducted, pre-concentration tailings are fed into a tailing bin through the spiral conveyor, and pre-concentration concentrate is fed into a grinding-concentration system for treatment through the spiral conveyor. According to the fine-fraction roasting iron ore full-sealing dry waste-discarding process, -1mm-sized roasting ore is subjected to dry waste-discarding treatment, barren rocks and wall rock are prevented from entering the grinding-concentration system, the phenomenon that the ore is discarded out along with the waste rocks is prevented, the probability of the grinding-concentration cost is decreased, and the problems that iron phyllite and jasper affect separating indexes is solved; and the pre-concentration efficiency is high, the waste-discarding effect is good, it can be controlled that the discarded barren rocks do not contain the iron ore, and wasting of resources is avoided.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a fully-sealed dry-type discarding process for fine-grained roasted iron ore. Background technique [0002] my country's iron ore resources are rich in lean ore and less in magnetic ore. Weak magnetic iron ore accounts for more than 70% of the total reserves. When mining weak magnetic iron ore, 10-15% of waste rock and surrounding rock are mixed into it. The fine ore with a diameter of -1 mm is not effective after strong magnetic or jigging pre-selection, the dust on the job site is large, and there are still about 50% iron ore in the pre-selection waste, resulting in waste of resources. Without strong magnetic or jigging pre-selection treatment, 10-15% of waste rock and surrounding rock will enter the roasting and grinding system. First, the cost of roasting and grinding will increase; second, there are iron-containing phyllite and jasper in the surrounding...

AI Technical Summary

Problems solved by technology

[0002] my country's iron ore resources are rich in lean ore and less in magnetic ore. Weak magnetic iron ore accounts for more than 70% of the total reserves. When mining weak magnetic iron ore, 10-15% of waste rock and surrounding rock are mixed into it. The fine ore with a diameter of -1mm is not effective after strong magnetic or jigging pre-selection, the dust on the job site is large, and there are still about 50% of the iron ore in the pre-selection waste, resulting in waste of resources

Without strong magnetic or jigging pre-selection treatment, 10-15% of waste rock and surrounding rock will enter the roasting and grinding system. First, the cost of roasting and grinding will increase; second, there are iron-containing phyllite and jasper in the surrounding rock Affects the selection index, especially SiO 2 The content increases, resulting in an increase in the cost of sintering

At the same time, there are problems of poor dry pre-selection effect of magnetic pulley and large dust after roasting of fine-grained powder ore with a particle size of -1mm

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