Beneficiation process for mixed ore of magnetite and hematite

Abstract

The invention relates to a beneficiation process for mixed ore of magnetite and hematite. The beneficiation process comprises the steps that after the raw ore is subjected to staged grinding and coarse and fine grading, the coarse and fine graded and settled sand is subjected to reselecting process to obtain gravity concentrate and tailings, and the coarse and fine graded overflow is subjected toa weak magnetic-anion reversed flotation process to obtain flotation concentrate and the tailings, wherein the comprehensive fine ore are composed of the gravity concentrate and the flotation concentrate. Compared with the staged grinding, coarse and fine grading, gravity concentration, and strong magnetic-anionic reversed flotation process, the quality level of the flotation concentrate can be improved by two percent points, and the quality level of the comprehensive and fine ores can be improved by 1 percent, and meanwhile, the capital investment cost of construction, the construction occupied area and the production operation cost of a strong magnetic machine, a strong magnetic pre-concentration machine, and a flotation pre-concentration machine are reduced, and the energy conservationand consumption reduction are achieved; and due to the amount of dry ore entering the flotation operation is reduced, the dosage of the flotation reagents can also be reduced, so that the environmental pollution can be reduced, the production investment can be reduced, the cost is reduced and the energy is saved under the condition that the earnings are the same, and good economic benefits and social benefits are achieved.

Description

technical field [0001] The invention relates to the technical field of ore dressing, in particular to a magnetic red mixed ore beneficiation process capable of improving the grade of concentrate. Background technique [0002] With the introduction of the "concentrated material policy" in the metallurgical industry and the needs of the market economy, the iron and steel industry has continuously improved the quality of iron concentrates. The increase in the grade of iron concentrates can increase the output of blast furnaces, reduce energy consumption, and reduce "three wastes" emissions. Therefore, under the current market economic conditions, improving and improving the product quality of iron concentrate powder can improve the market competitiveness of the product and better meet the market demand. By improving the grade of iron concentrate powder and reducing the impurity content in iron concentrate powder, it can meet the continuous improvement requirements of iron conce...

AI Technical Summary

Problems solved by technology

[0003] At present, my country's magnetic-red mixed ore is mostly separated by stage grinding, coarse and fine classification, gravity separation-strong magnetic-anion reverse flotation process. It is found in the previous experimental research that the anion reverse flotation collector currently used has a negative impact on magnetic Iron ore has a good separation effect, but the separation effect for hematite is not very ideal; in the hematite anion reverse flotation test, as the content of magnetite increases, the flotation test results will be promoted. It can improve the grade of flotation concentrate. The current technological process has a low recovery rate of hematite and will affect the concentrate grade. At the same time, the initial investment and production and operation costs of this process are relatively large.

Images