A method for recovering ilmenite concentrate by strong magnetic roughing and multi-stage spiral chute gravity separation

Abstract

The invention discloses a method for selecting and recovering titanium concentrate by using strong magnetic roughing and multi-stage spiral chute gravity separation. The method includes the following steps: 1) Using a high-efficiency thickener to separate iron from iron tailings by weak magnetic separation 2) The fine mud in the underflow slurry is removed by an inclined plate thickener to obtain the underflow; 3) The coarse slag in the underflow is separated by a high-efficiency linear sieve to collect the separated slag 4) According to the difference in specific magnetic susceptibility coefficient between titanium concentrate and magnetite, a 3000Gs semi-countercurrent magnetic separator is selected to pre-remove the tailings after separation of slag; and then remove iron and titanium by weak magnetic iron removal Mixed conjoined organisms, and then carry out strong magnetic separation through a vertical ring pulsating high-gradient magnetic separator; 5) The product obtained in step 4) is subjected to multiple roughing, sweeping and selective selection by a spiral chute, and the separation by the spiral chute The material method adopts a three-stage annular separator to divide the material, and the final spiral titanium concentrate is obtained after being separated by a multi-stage spiral chute.

Description

technical field [0001] The invention relates to recovering ilmenite, in particular to a method for recovering ilmenite concentrate by using strong magnetic roughing and multi-stage spiral chute gravity separation. Background technique [0002] The methods for recovering the ilmenite in the iron dressing tailings of vanadium-titanium-magnetite mainly include: for the coarse-grained ilmenite whose 200 mesh content is less than 30% as the selected raw material, the recovery process is usually spiral chute re-election-dry strong Magnetic separation process and spiral chute gravity separation-dry electric separation process, the recovery process of fine-grained ilmenite with a -200 mesh content greater than 50% is often a strong magnetic-strong magnetic-flotation process. [0003] Defects and deficiencies of the prior art: (1) Spiral chute re-election-dry strong magnetic separation process: the coarse-grained ilmenite recovery process of selected raw materials-200 mesh content le...

AI Technical Summary

Problems solved by technology

[0003] Defects and deficiencies of the prior art: (1) Spiral chute re-election-dry strong magnetic separation process: the coarse-grained ilmenite recovery process of selected raw materials-200 mesh content less than 30% is often spiral chute re-election-dry Type strong magnetic separation process, this process is to enrich the ilmenite in the tailings of vanadium-titanium-magnetite iron dressing by adopting two-stage to three-stage spiral chute to enrich TiO-containing 2 Titanium medium ore with a grade of 38% to 40%, and then, dry the titanium medium ore, and then dry the dried titanium medium ore, and the dry strong magnetic separator is a drum strong magnetic separator , its surface magnetic field strength is 7000~12000Oe, dry strong magnetic separation will contain TiO 2 Grade 38% titanium medium ore is upgraded to contain TiO 2 Titanium concentrate with a grade above 46%

This process has the following main deficiencies: ① The particle size requirements for the selected raw materials are relatively strict. If there is more -200 mesh content in the selected raw materials, the titanium concentrate TiO 2 The recovery rate is low, and the recovery effect is poor; ②The titanium medium ore needs to be dried by heat before the dry strong magnetic separation, and the drying process and the dry strong magnetic separation process will produce a large amount of dust, and the working environment is poor , need to use more dry dust removal equipment for system process dust removal; ③ Dry strong magnetic separator has small processing capacity, more auxiliary equipment, and large equipment footprint; ④ Due to the need to dry titanium medium ore, its The amount of drying is large, and at the same time, there are many auxiliary equipment such as dry separation and dust removal, and the operating cost is relatively high

This process has the following main deficiencies: ① The particle size requirements for the selected raw materials are relatively strict. If there are more -200 mesh content in the selected raw materials, the titanium concentrate TiO 2 The recovery rate is low and the recovery effect is poor; ②The titanium medium ore needs to be dried by heat before the dry electric separation, and the drying process and the dry strong magnetic separation process will produce a large amount of dust, and the working environment is poor. More dry dust removal equipment is needed for system process dust removal; ③ The dry electric separator equipment has small processing capacity, more auxiliary equipment, and the equipment occupies a large area; ④ Due to the need to dry titanium middlings and its The temperature of the ore needs to be higher than 80°C, and the drying capacity is large. At the same time, there are many auxiliary equipment such as dry separation and dust removal, and the operating cost is relatively high.

This process has the following main deficiencies: ①The particle size of the selected raw materials requires that the content of +150 mesh should not be too much, otherwise, the titanium concentrate TiO 2 The recovery rate is low; ②Ilmenite flotation requires a variety of flotation reagents, and the cost of flotation reagents is high; ③The number of equipment sets required for flotation is large, and the power consumption is relatively high