A method of enriching ilmenite

Abstract

The invention discloses a method for enriching ilmenite. The method comprises the steps of carrying out grinding, weak magnet deironing and classification on an ilmenite raw material to obtain materials with two particle sizes of +0.038 mm and -0.038 mm; carrying out medium and strong magnet iron removing on the material with the particle size of +0.038 mm, so as to obtain coarse titanium ore; carrying out magnetic separation on the coarse titanium ore, so as to obtain coarse titanium concentrate 1 and tailings 1; and carrying out magnetic separation on the material with the particle size of -0.038 mm, so as to obtain coarse titanium concentrate 2 and tailings 2. According to the method, different gradient values are obtained through utilizing the difference of mineral magnetism and accurately adopting different magnetic field strength and media, the enrichment of ilmenite is effectively achieved, the level of the obtained coarse titanium concentrate 1 can be improved to 26 to 28%, the recovery rate can reach 80 to 85%, an available method is further provided for enrichment and recycling of ilmenite with the ultrafine-particle size of -0.038 mm, ilmenite tailings with the particle size of -0.038 mm in a conventional technology are effectively enriched and recycled, and resource waste is reduced.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, in particular to a method for enriching ilmenite. Background technique [0002] Ilmenite is an oxide mineral of iron and titanium, which accounts for at least 85% of the world's titanium raw materials. It is the main ore for extracting titanium, so it is regarded as an important mineral material. my country's ilmenite resource reserves rank first in the world, mainly primary ilmenite, accounting for 94.5% of the resources. With the shortage and rising price of natural rutile, stable supply and low price of ilmenite is becoming an important raw material for production. However, TiO in ilmenite 2 The grade is low and generally contains other impurities. Therefore, the enrichment of ilmenite has received great attention in the field of mineral processing. [0003] At present, the enrichment method of primary ilmenite ore in China is mainly to enrich the ilmenite ore after crushing and...

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Problems solved by technology

However, in the prior art, the vertical ring magnetic separation process is used to separate the primary ilmenite to obtain the crude titanium concentrate. The material is first fed into the ore box of the magnetic separator, and the magnetic separation medium rotates in the ore box, and the ferro-ilmenite in the slurry The ore is adsorbed on the medium of the magnetic separator by the action of the magnetic field of the vertical ring magnetic separation, and the magnetic effect of the magnetic separation medium on the mineral will be weakened with the increase of the distance. It becomes a concentrate on the magnetic medium, and it is difficult to further extract TiO while ensuring a recovery rate of 70%. 2 It is also not conducive to reducing the consumption of chemicals and process costs in the next enrichment process

[0004] In addition, most current processes cannot recover the -0.038mm ilmenite produced in the crushing-grinding process. This part of ilmenite is currently directly discharged to the tailings pond for discarding, which will not only cause ilmenite raw materials waste and impact on the environment

This is because the equipment currently used for grading is mainly divided into sieve grading and inclined plate grading. In industry, the particle size of materials classified by sieves can only reach +0.074mm. Due to the low opening ratio of sieves, the classification efficiency of finer materials is very high. Low, difficult to be used in industrial production; slant plate classification is used in both coarse-grained and fine-grained grades in the field of classification. Due to the very small difference in gravity and the influence of particle shape, the efficiency of particle size classification is low

At present, the recovery of -0.038mm ilmenite is only found in suspension vibration beneficiation, but suspension vibration beneficiation belongs to flow film beneficiation, which requires materials to be distributed as thinly as possible on the beneficiation and separation surface. Therefore, on the one hand, this process requires a very In a large site, on the other hand, whether the slurry can be evenly distributed to multiple suspension vibration dressings will directly affect the subsequent titanium concentrate indicators. Uneven distribution makes it difficult to obtain qualified concentrate products, and it is difficult to ensure the effect of industrial implementation.

Moreover, the suspension vibratory beneficiation cannot be separated accurately according to the magnetic difference between ilmenite and non-ilmenite, but according to the difference in the specific gravity of the material. The separation is affected by the particle size and shape of the material, resulting in abnormal The ilmenite is selected into the concentrate, and the ilmenite is brought into the tailings at the same time, and the separation effect is not ideal

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