Stage grinding and desliming, gravity separation, magnetic separation and floatation process for extremely poor hematite

Abstract

The invention provides a stage grinding and desliming, gravity separation, magnetic separation and floatation process for extremely poor hematite. The process is characterized by comprising the steps of subjecting raw ore to first-stage closed grinding, subjecting a first-stage classified product to desliming, subjecting desliming bottom flow to rough spiral separation, subjecting rough spiral separation concentrate to fine spiral separation, subjecting rough spiral separation middling to middle magnetic scavenging, carrying out self-circulation on fine spiral separation middling, subjecting middle magnetic scavenging concentrate and fine spiral separation tailing to second-stage grinding, desliming a second-stage grinding product, subjecting bottom flow to recleaning rough spiral separation, subjecting recleaning rough spiral separation concentrate to recleaning fine spiral separation, carrying out self-circulation on recleaning fine spiral separation middling, subjecting recleaning fine spiral separation tailing, recleaning rough spiral separation tailing, rough spiral separation tailing and desliming overflow to primary concentration, subjecting ore pulp after primary concentration to strong magnetic treatment, carrying out secondary concentration on strong magnetic treatment concentrate, then subjecting to floatation, combining recleaning fine spiral separation concentrateand fine spiral separation concentrate to obtain final concentrate, and abandoning floatation, strong magnetic treatment and middle magnetic scavenging tailings. The process provided by the inventionis stable in operation, reduces ore concentration cost and improves resource utilization rate.

Description

technical field [0001] The invention relates to the technical field of ore dressing, in particular to a stage grinding, desliming-gravity separation-magnetic separation-flotation process of extremely lean hematite. Background technique [0002] Extremely poor hematite ore is an important type of iron ore in my country, and its industrial grade is generally 16-23%. At present, the beneficiation process for processing lean hematite mostly adopts stage grinding, coarse and fine separation, gravity separation-strong magnetic-flotation process and continuous grinding, strong magnetic-flotation process, but the processing industrial grade is generally 16-23 % very poor hematite, there is a big shortage. [0003] 1. For stage grinding, coarse and fine separation, gravity separation-strong magnetic-flotation process: [0004] (1) The final tailings of this process are composed of three parts, namely gravity separation tailings, magnetic separation tailings and flotation tailin...

AI Technical Summary

Problems solved by technology

[0008] (2) The biggest feature of this process is continuous grinding, the grinding cost is high, and only the flotation operation produces concentrate, resulting in high production costs

When the magnetic rate is too low, the grade of magnetic separation tailings is high, the yield is high, and the recovery rate is low; increasing the magnetic separation field strength will lead to a decrease in the grade of magnetic separation concentrate, which will affect the quality of flotation concentrate

Therefore, the production practice requires the magnetic rate of the raw ore to reach more than 10%, otherwise the best technical and economic indicators cannot be achieved

[0009] To sum up, these two technological processes are difficult to operate and have high production costs, so they are not suitable for processing extremely poor hematite with a grade of 16-23%.

And when the magnetic rate of raw ore is lower than 10%, better technical and economic indicators cannot be obtained

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