Technological method for improving quality of vanadium-titanium iron concentrates

Abstract

The invention relates to a technological method for improving the quality of vanadium-titanium iron concentrates. Various techniques are integrated. The technological method includes preliminary classification, fine screening classification, three-section ore grinding, concentration magnetic separation and stair magnetic separation. In preliminary classification, a qualified fraction part good indissociation in rough iron concentrates can be effectively classified out, the treatment capability of a mill is improved, and energy consumption of the product is lowered. In fine screening classification, a fine screening closed loop is adopted for cyclic ore grinding, compared with common rotational flow classification, classification is conducted strictly according to the particle size, meanwhile, the classification efficiency reaches up to 70% or higher, the qualified fraction is better classified out in time, excessive grinding is reduced, and cyclic loads are reduced. In concentration magnetic separation, concentration magnetic section is adopted before ore grinding, part of weak magnetic titanium ore and gangue can be removed out, excessive grinding of the titanium ore is reduced,and the titanium iron ore recycling rate is increased; and meanwhile, the ground ore grade is improved, the yield is increased, and the product cost is reduced. In stair magnetic separation, iron andtitanium separation is well achieved, and the iron concentrate grade is improved step by step.

Description

technical field [0001] The invention belongs to the technical field of vanadium-titanium magnetite ore sorting, and relates to a process method for improving the quality of vanadium-titanium-iron concentrate. Background technique [0002] my country's vanadium-titanium magnetite deposits are widely distributed and rich in reserves. The reserves and mining volume rank third in the country's iron ore deposits. They are mainly distributed in Panzhihua, Hebei Chengde Industrial Zone, Shaanxi Hanzhong, Hubei Yunyang, Xiangyang, Guangdong Xingning and Shanxi Dai County and other areas. Among them, the Panzhihua area is the main ore-forming belt of vanadium-titanium magnetite in my country, and it is also one of the important production areas of similar deposits in the world. Due to the special ore properties of vanadium-titanium magnetite, in which iron and titanium are embedded in solid solution, the recovery of this type of vanadium-titanium-iron concentrate by physical benefici...

AI Technical Summary

Problems solved by technology

[0008] (1) Qualified iron concentrate continues to be ground, which increases product energy consumption and reduces mill processing capacity; entrained titanium minerals are excessively ground, resulting in a decrease in the recovery rate of ilmenite

[0009] (2) The three-stage permanent magnetic drum magnetic separator cannot break the magnetic agglomeration of vanadium-titanium magnetite due to severe residual magnetism, resulting in gangue minerals and undissociated weak magnetic titanium minerals in the concentrate products, reducing the product quality

The advantages of this invention are: due to the adoption of the above-mentioned process, the grade and recovery rate of iron ore concentrate are effectively improved, the energy consumption of mineral processing is reduced, the resource utilization rate is improved, and the production cost is reduced. Iron minerals in titanium magnetite, not considered for recovery of titanium minerals

Due to the finer grinding particle size, the -325 mesh content of magnetic separation tailings increases, and the recovery rate of fine ilmenite will decrease significantly, resulting in a low comprehensive recovery rate of titanium resources

②Magnetic separation column has poor effect of breaking up magnetic agglomeration, and the improvement of vanadium-titanium iron concentrate quality is relatively small, especially for the production of vanadium-titanium iron concentrate with olivine-type vanadium-titanium magnetite.

[0011] The invention patent with the patent application number 201410467517.1 discloses a process for upgrading and re-separation of fine magnetite concentrate powder, specifically related to a process for upgrading and re-separation of fine magnetite concentrate powder, including iron concentrate I separation process and comprehensive iron concentrate In the ore II grinding and separation process, the automatic magnetic levitation concentrator is first fed into the automatic magnetic levitation concentrator. The automatic magnetic levitation concentrator has a built-in positive and negative two-way magnetic field, which can make the magnet fine powder in a suspended state in the pulp and release the gangue mixed in the magnetic chain. , can directly obtain iron concentrate I with a grade ≥ 68% and a recovery rate of up to 90%. Composed of weak magnetic separation and tailings strong magnetic separation operations, iron concentrate II with a grade of 55% to 57% and a recovery rate of 8% to 8.5% can be obtained. A strong magnetic machine is used to concentrate the magnetic separation of the concentrate and the concentration of the medium ore The tailings of magnetic separation and two-stage weak magnetic separation are re-selected, and part of the iron concentrate II can be recovered from the tailings, which saves energy and reduces consumption, improves the recovery rate, reduces the grade of tailings, reduces metal loss, and improves the social environment. benefits, and promote the sustainable development of enterprises and society, but the defects of this patent are ① the fineness reaches -30 micron particle size ≥ 80%, and for vanadium-titanium magnetite, it will cause fine-grained ilmenite to be difficult to recover by strong magnetic flotation process , resulting in a significant reduction in the comprehensive recovery rate of titanium resources

②Automatic magnetic levitation concentrator, it is difficult to effectively disperse the magnetic agglomeration of vanadium-titanium magnetite due to severe residual magnetism, and the quality of vanadium-titanium-iron concentrate is improved slightly

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