Magnetic separation process of fine lean hematite

Abstract

The invention belongs to the technical field of separation of hematite in ferrous metals and in particular provides a magnetic separation process of fine lean hematite. The process comprises coarse and fine classified overflow and is characterized by comprising the following steps: feeding the coarse and fine classified overflow with concentration being less than 25% into a concentrator before high-intensity magnetic separation, feeding the bottom flow with concentration being 35-40%, which is concentrated by the concentrator before high-intensity magnetic separation into a low-intensity magnetic separator for low-intensity magnetic separation, wherein the overflow in the concentrator before high-intensity magnetic separation is tailing, feeding the concentrates after low-intensity magnetic separation into concentration operation before floatation, feeding the tailing after low-intensity magnetic separation into a slag remover to remove the slag, feeding the concentrates after the slag remover removes the slag into a high-intensity magnetic separator for high-intensity magnetic separation, feeding the high-intensity magnetic concentrates separated by the high-intensity magnetic separator into concentration before floatation and combining the concentrated tailing before high-intensity magnetic separation, the slag removed tailing and the tailing after high-intensity magnetic separation into the final tailings. The process improves the feeding conditions during low-intensity magnetic operation, reduces the number of the low-intensity magnetic separators needing to be operated and reduces the low-intensity magnetic operation and the final tailings grade.

Description

technical field

[0001] The invention belongs to the technical field of hematite ore beneficiation in ferrous metal beneficiation, in particular to a fine-grained magnetic separation process of lean hematite. Background technique

[0002] The existing fine-grained magnetic separation process of lean hematite is coarse and fine-grained overflow → weak magnetic separation → concentration before strong magnetic separation → slag removal → strong magnetic separation → concentration before flotation. This part of the process has the following problems: the separation effect of weak magnetic operation is not ideal due to poor ore feeding conditions. The specific performance is that the ore concentration of the magnetic weakening machine is low, only 20% to 25%, and the particle size is relatively fine, with a -200 mesh content of more than 90%. Therefore, not only the number of magnetic weakening machines required is large, but also the magnetic field weakening There are few machi...

Examples

Embodiment Construction

[0015] The specific implementation manner of the present invention will be described below in conjunction with the accompanying drawings.

[0016] like figure 1 Shown, a kind of depleted hematite fine-grained magnetic separation process of the present invention comprises the overflow 1 of coarse and fine classification, is characterized in that comprising the following steps (by weight percentage):

[0017] 1) The concentration is <25%, the particle size is -200 mesh, the content is 90-95%, the grade is 22%-24%, and the product of coarse and fine classification overflow 1 is fed into the thickener 2 before the strong magnetic separation,

[0018] 2) The concentration of 35% to 40% of the underflow concentrated by the thickener 2 before the strong magnetic separation is fed into the weak magnetic separator for weak magnetic separation 3, and the overflow of the thickener before the strong magnetic separation is tailings,

[0019] 3) Feed the weak magnetic separation concentrat...

technical field

[0001] The invention belongs to the technical field of hematite ore beneficiation in ferrous metal beneficiation, in particular to a fine-grained magnetic separation process of lean hematite. Background technique

[0002] The existing fine-grained magnetic separation process of lean hematite is coarse and fine-grained overflow → weak magnetic separation → concentration before strong magnetic separation → slag removal → strong magnetic separation → concentration before flotation. This part of the process has the following problems: the separation effect of weak magnetic operation is not ideal due to poor ore feeding conditions. The specific performance is that the ore concentration of the magnetic weakening machine is low, only 20% to 25%, and the particle size is relatively fine, with a -200 mesh content of more than 90%. Therefore, not only the number of magnetic weakening machines required is large, but also the magnetic field weakening There are few machi...

Examples

Embodiment Construction

[0015] The specific implementation manner of the present invention will be described below in conjunction with the accompanying drawings.

[0016] like figure 1 Shown, a kind of depleted hematite fine-grained magnetic separation process of the present invention comprises the overflow 1 of coarse and fine classification, is characterized in that comprising the following steps (by weight percentage):

[0017] 1) The concentration is <25%, the particle size is -200 mesh, the content is 90-95%, the grade is 22%-24%, and the product of coarse and fine classification overflow 1 is fed into the thickener 2 before the strong magnetic separation,

[0018] 2) The concentration of 35% to 40% of the underflow concentrated by the thickener 2 before the strong magnetic separation is fed into the weak magnetic separator for weak magnetic separation 3, and the overflow of the thickener before the strong magnetic separation is tailings,

[0019] 3) Feed the weak magnetic separation concentrat...

Images