Method for extracting titanium and reducing impurities from vanadium titano-magnetite iron ore dressing tailings

Abstract

The invention discloses a method for extracting titanium and reducing impurities from vanadium titano-magnetite iron ore dressing tailings. The method comprises the following steps: (1) carrying out first-stage high-intensity magnetic separation on the vanadium titano-magnetite iron ore dressing tailings; (2) classifying the first-section strong magnetic tailings to obtain overflow a, classifyingthe first-section strong magnetic concentrates to obtain overflow b and settled sand b, and performing ore grinding classification on the settled sand b to obtain overflow c; (3) carrying out second-stage strong magnetic separation on the overflow c; (4) grading the second-section strong magnetic concentrate to obtain overflow d and settled sand d, carrying out sulfur reduction treatment on the settled sand d, and carrying out titanium separation and flotation to obtain medium-coarse-fraction titanium concentrate; (5) combining the overflow a, the overflow b and the overflow d, and concentrating to obtain concentrated underflow ore pulp a; (6) carrying out third-stage strong magnetic separation on the concentrated underflow ore pulp a, and concentrating to obtain concentrated underflow orepulp b; and (7) carrying out sulfur reduction treatment on the concentrated underflow ore pulp b, and carrying out titanium flotation to obtain micro-fine particle titanium concentrate. The method has the advantages of good impurity removal effect, high titanium recovery rate and the like.

Description

technical field [0001] The invention belongs to the mineral processing field, in particular to a mineral processing method of ilmenite. Background technique [0002] The Panzhihua-Xichang area in Sichuan is the main ore-forming area of ​​vanadium-titanium magnetite in China, which contains tens of billion tons of vanadium-titanium magnetite resources. Vanadium-titanium magnetite is mainly rich in two metal resources, iron and titanium, and the mineral forms are magnetite and ilmenite. The mineral processing principle process is usually based on "select iron first, then titanium", that is, after enriching iron metal through weak magnetic separation, select iron tailings and then separate titanium. Titanium selection processes include gravity separation, flotation, heavy-float combined method, heavy-float-electric combined method, strong magnetic-flotation method, strong magnetic-gravity-electric separation method, etc. With the increase of production capacity and technical e...

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Problems solved by technology

[0005] 1. The requirements for the selected particle size of minerals are relatively high, and the technical adaptability to narrow particle size is better, but the adaptability to wide particle size is poor, and the technical indicators fluctuate greatly;

[0006] 2. The lower limit of separation particle size of conventional pulsating strong magnetic separator is relatively high, and it is difficult to meet the recovery effect of -38μm fine-grained ilmenite. The recovery rate of this particle size strong magnetic separation titanium operation is generally about 55%;

[0007] 3. The particle size of the vanadium-titanium magnetite embedding is uneven, and the ilmenite minerals are over-crushed during the grinding process, making it difficult to recycle -20μm minerals; in actual production, inclined plate thickeners are usually used to process Concentration and classification of concentrated ore by strong magnetic separation, the overflow sample TiO 2 The grade is about 15%, and the yield is about 20% relative to the strong magnetic concentrate, and the fine particle size produced by the overflow of this part of the concentrated inclined plate will deteriorate the flotation index, and finally discarded in the tailings without effective recovery. This caused a large loss of titanium resources;

[0008] 4. In flotation, coarse and fine ilmenites are mixed, and low-grade fine ilmenite will affect the quality of the final product, and the sulfur content of fine minerals will also affect the index

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