Method for recovering ilmenite from low-grade titanium tailings

Abstract

The present invention relates to the field of vanadium-titanium magnetite recovery technology, in particular to a method for recovering ilmenite from low-grade titanium tailings: a. obtaining the slag screen overscreen material and the slag screen underscreen material; b. the slag screen underscreen material enters an iron removal weak magnetic machine for iron removal to obtain concentrate and tailings respectively; c. the roughing strong magnetic concentrate obtained by the roughing strong magnetic machine flows by gravity into the roughing concentrate pump pool; d. the cyclone bottom flow enters the tailings ditch in the factory building; e. the tailings obtained by the scavenging strong magnetic operation enters into the final tailings; f. The overflow of the roughing concentrate cyclone enters the laminated screen for classification; g. The screened material of the laminated screen enters the cyclone before the ball mill for concentration and classification; h. The discharge of the ball mill enters the slurry conveying pump pool; i. The bottom flow of the ball mill discharge classification cyclone enters the ball mill feed hopper; j. The overflow of the ball mill discharge cyclone is mixed with the overflow of the roughing concentrate cyclone; k. The screened material of the laminated screen enters the weak magnetic machine for iron removal; l. The concentrate obtained by the high-strength magnetic machine is concentrated.

Description

Technical Field

[0001] The invention relates to the field of vanadium-titanium magnetite recovery technology, in particular to a method for recovering ilmenite from low-grade titanium tailings. Background Art

[0002] At present, the process of first selecting iron, then selecting iron tailings, and then selecting titanium is adopted in the beneficiation production of vanadium-titanium magnetite. Because the process of stage grinding and stage separation is mostly adopted in this process, the particle size of the iron tailings in each section is quite different, and the particle size of the titanium tailings is also quite different. In the above process, the loss of titanium metal is mainly divided into three categories: the -400 mesh part in the strong magnetic tailings has fine particle size, and the +100 mesh and tailings coarse sand part in the flotation tailings have coarse particle size. Therefore, in the actual recovery process, the recovery rate of coarse and fine particle size titanium metal in the tailings is low, resulting in a great waste of resources. As for how to recover the recovery rate of coarse and fine particle size titanium metal in the tailings, there is no relevant record in the current technology. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a method for recovering ilmenite from low-grade titanium tailings, which can recover coarse and fine particle titanium metal in tailings and effectively improve the recovery rate of titanium metal.

[0004] The technical solution adopted by the present invention to solve its technical problem is: a method for recovering ilmenite from low-grade titanium tailings, comprising the following steps: a. first, the total tailings are placed in a slag separation linear vibrating screen for slag separation treatment, and the slag separation screen overscreen and the slag separation screen underscreen are obtained respectively, and the slag separation screen overscreen enters the tailings; b. The slag separation screen underscreen enters an iron removal weak magnetic machine for iron removal to obtain concentrate and tailings respectively, the concentrate enters a sub-iron concentrate delivery pump pool, and the tailings enter a roughing strong magnetic machine; c. The roughing strong magnetic concentrate obtained by the roughing strong magnetic machine flows by gravity into the roughing concentrate pump pool, and the roughing strong magnetic machine obtains The roughing strong magnetic tailings flow by gravity into the roughing tailings pump pool, and then are sent to the roughing tailings classification cyclone by the slurry pump for classification; d. After the roughing tailings are classified by the cyclone, the cyclone bottom flow enters the tailings ditch in the factory building, and the cyclone overflow enters the scavenging strong magnetic machine for tailings dumping; e. The tailings obtained by the scavenging strong magnetic operation flow by gravity into the final tailings, and the concentrate obtained by the scavenging strong magnetic operation enters the roughing concentrate pump pool and is mixed with the roughing concentrate, and then is sent to the roughing concentrate classification cyclone by the slurry pump for classification; f. The overflow of the roughing concentrate cyclone enters the laminated screen for classification; g. The laminated screen in step f The oversize material flows by gravity into the cyclone before the ball mill for concentration and classification. The classified sediment enters the ball mill feed hopper and mixes with the bottom flow of the roughing concentrate classification cyclone, and then flows by gravity into the ball mill through the ball mill feed pipe for grinding. The classification overflow flows by gravity into the ball mill discharge pump pool; h. The discharge of the ball mill flows by gravity into the slurry delivery pump pool, and after the concentration is adjusted by water in the pump pool, it is sent to the ball mill discharge classification cyclone by the slurry pump for classification; i. The underflow of the ball mill discharge classification cyclone flows by gravity into the ball mill feed hopper, and is mixed with the bottom flow of the roughing concentrate cyclone and the oversize material on the laminated screen for classification and sedimentation again, and then returns to the ball mill. And form a closed-loop grinding operation; j. The overflow of the ball mill discharge cyclone is mixed with the overflow of the roughing concentrate cyclone, and then returns to the laminated screen; k. The underscreen of the laminated screen in step f enters the weak magnetic machine for iron removal, wherein the concentrate obtained by weak magnetic iron removal is mixed with the slag separation iron removal concentrate, and then transported by the slurry pump back to the iron selection process, and the iron removal tailings of the underscreen of the laminated screen enter the selection strong magnetic machine for selection; l. The tailings of the selection strong magnetic machine in step k enter the tailings, are mixed with all tailings and sewage to form total tailings, and the concentrate obtained by the selection strong magnetic machine is concentrated, and enters the flotation operation as the flotation raw material in the next step.

[0005] Furthermore, in step b, the dielectric rod of the roughing strong magnetic machine is φ3mm and the magnetic induction intensity is 7500GS.

[0006] Furthermore, in step d, the dielectric rod of the scanning strong magnetic machine is φ1.5mm and the magnetic induction intensity is 6000GS.

[0007] Furthermore, in step k, the dielectric rod of the selected strong magnetic machine is φ1.5mm and the magnetic induction intensity is 6000GS.

[0008] The beneficial effects of the present invention are as follows: by optimizing the process steps for recovering coarse and fine-grained titanium metal in tailings, the recovery rate of titanium metal is effectively improved. Specifically, the method pre-classifies the roughing concentrate, which reduces the processing capacity of the mill while reducing the over-grinding caused by fine-grained materials entering the mill again. On this basis, classification is performed before scavenging, and the recovery of coarse-grained and fine-grained titanium metals is respectively carried out, which effectively improves the recovery rate. The present invention greatly improves the recovery rate of titanium metal by optimizing the process technology, and is particularly suitable for the process of recovering ilmenite from low-grade titanium tailings. DETAILED DESCRIPTION

[0009] The method for recovering ilmenite from low-grade titanium tailings comprises the following steps: a. first, the total tailings are put into a slag separation linear vibrating screen for slag separation treatment, and the slag separation screen oversize and slag separation screen undersize are obtained respectively, and the slag separation screen oversize enters the tailings; after separation by the slag separation screen, the oversize is first screened out, so as to facilitate further treatment of the undersize; b. The slag separation screen undersize enters an iron removal weak magnetic machine for iron removal to obtain concentrate and tailings respectively, the concentrate enters a sub-iron concentrate conveying pump pool, and the tailings enter a roughing strong magnetic machine; c. The roughing strong magnetic concentrate obtained by the roughing strong magnetic machine flows by gravity into the roughing concentrate The roughing strong magnetic tailings obtained by the roughing strong magnetic machine flow into the roughing tailings pump pool by gravity, and then are sent to the roughing tailings classification cyclone by the slurry pump for classification; d. After the roughing tailings are classified by the cyclone, the cyclone bottom flow enters the tailings ditch in the plant, and the cyclone overflow enters the scavenging strong magnetic machine for tailings dumping; e. The tailings obtained by the scavenging strong magnetic operation flow into the final tailings by gravity, and the concentrate obtained by the scavenging strong magnetic operation enters the roughing concentrate pump pool and is mixed with the roughing concentrate, and then is sent to the roughing concentrate classification cyclone by the slurry pump for classification; f. The overflow of the roughing concentrate cyclone enters the laminated screen for classification; g. The oversize of the laminated screen in step f flows by gravity into the hydrocyclone before the ball mill for concentration and classification. The classified sediment enters the ball mill feed hopper and mixes with the bottom flow of the roughing concentrate classification hydrocyclone, and then flows by gravity into the ball mill through the ball mill feed pipe for grinding. The classified overflow flows by gravity into the ball mill discharge pump pool; h. The discharge of the ball mill flows by gravity into the slurry delivery pump pool, and after the concentration is adjusted by water in the pump pool, it is sent to the ball mill discharge classification hydrocyclone by the slurry pump for classification; i. The bottom flow of the ball mill discharge classification hydrocyclone flows by gravity into the ball mill feed hopper, and after being classified and sedimented again with the bottom flow of the roughing concentrate hydrocyclone and the oversize of the laminated screen, it returns to the ball mill. mill, thereby forming a closed-loop grinding operation; j. The overflow of the ball mill discharge cyclone is mixed with the overflow of the roughing concentrate cyclone, and then returns to the laminated screen; k. The underscreen of the laminated screen in step f enters the weak magnetic machine for iron removal, wherein the concentrate obtained by weak magnetic iron removal is mixed with the slag separation iron removal concentrate, and then transported by the slurry pump back to the iron selection process, and the iron removal tailings of the underscreen of the laminated screen enter the selection strong magnetic machine for selection; l. The tailings of the selection strong magnetic machine in step k enter the tailings, are mixed with all tailings and sewage to form total tailings, and the concentrate obtained by the selection strong magnetic machine is concentrated, and enters the flotation operation as the flotation raw material in the next step.

[0010] The following two major problems in the prior art have been well solved in the present invention: First, in the coarse-grained tailings, ilmenite is not dissociated into monomers, and grinding is required to further enrich the titanium metal. Second, in the fine-grained tailings, most of the titanium metal comes from strong magnetic tailings, and the problem of strong magnetic recovery difficulties needs to be solved.

[0011] In addition, in order to further improve the recovery rate, it is preferred to use different dielectric rods and magnetic field strengths in different beneficiation stages. In step b, the dielectric rod of the roughing strong magnetic machine is preferably φ3mm, and the magnetic induction intensity is 7500GS. In step d, the dielectric rod of the sweeping strong magnetic machine is preferably φ1.5mm, and the magnetic induction intensity is 6000GS. In step k, the dielectric rod of the fine strong magnetic machine is preferably φ1.5mm, and the magnetic induction intensity is 6000GS.

[0012] The present invention pre-classifies the rougher concentrate, which reduces the processing capacity of the mill and reduces the over-grinding caused by the re-entry of fine-grained materials into the mill. On this basis, classification is performed before scavenging, and the coarse-grained and fine-grained titanium metals are recovered respectively, which effectively improves the recovery rate. The technical advantages are very obvious and the market promotion prospects are broad.

Claims

1. A method for recovering ilmenite from low-grade titanium tailings, characterized in that: The steps include: a. First, the total tailings are put into the slag separation linear vibrating screen for slag separation treatment, and the slag separation screen overscreen material and the slag separation screen underscreen material are obtained respectively, and the slag separation screen overscreen material enters the tailings; b. The material under the slag screen enters the iron removal weak magnetic machine for iron removal to obtain concentrate and tailings respectively. The concentrate enters the secondary iron concentrate delivery pump pool, and the tailings enter the roughing strong magnetic machine; c. The roughing strong magnetic concentrate obtained by the roughing strong magnetic machine flows by gravity into the roughing concentrate pump pool, and the roughing strong magnetic tailings obtained by the roughing strong magnetic machine flows by gravity into the roughing tailings pump pool, and then are sent to the roughing tailings classification cyclone by the slurry pump for classification operation; d. After the roughing tailings are classified by the hydrocyclone, the underflow of the hydrocyclone enters the tailings ditch in the plant, and the overflow of the hydrocyclone enters the sweeping and strong magnetic machine for tailings disposal; e. The tailings obtained from the scavenging and strong magnetic operation flow into the final tailings by gravity, and the concentrate obtained from the scavenging and strong magnetic operation enters the roughing concentrate pump pool and is mixed with the roughing concentrate, and then is sent to the roughing concentrate classification cyclone by the slurry pump for classification operation; f. The overflow of the roughing concentrate cyclone enters the laminated screen for classification; g. The screen material of the laminated screen in step f flows by gravity into the hydrocyclone before the ball mill for concentration and classification, and the classified sediment enters the ball mill feed hopper and mixes with the bottom flow of the rougher concentrate classification hydrocyclone, and then flows by gravity into the ball mill through the ball mill feed pipe for grinding, and the classified overflow flows by gravity into the ball mill discharge pump pool; h. The discharge of the ball mill flows into the slurry delivery pump pool by gravity, and after the concentration is adjusted by water replenishment in the pump pool, it is pumped into the ball mill discharge classification cyclone by the slurry pump for classification operation; i. The bottom flow of the ball mill discharge and classification cyclone flows into the ball mill feed hopper by gravity, and is mixed with the bottom flow of the roughing concentrate cyclone and the material on the laminated screen for classification and sedimentation again, and then returns to the ball mill, thus forming a closed-loop grinding operation; j. The overflow of the ball mill discharge cyclone is mixed with the overflow of the rougher concentrate cyclone and then returned to the laminated screen; k. The undersize of the laminated screen in step f enters a weak magnetic machine for iron removal, wherein the concentrate obtained by weak magnetic iron removal is mixed with the slag separation iron removal concentrate, and then transported back to the iron selection process by a slurry pump, and the iron removal tailings of the laminated screen undersize enter a concentrating strong magnetic machine for concentrating operation; l. The tailings from the high-intensity magnetic machine in step k enter the tailings and are mixed with all tailings and sewage to form total tailings. The concentrate obtained by the high-intensity magnetic machine is concentrated and enters the flotation operation as the flotation raw material in the next step.

2. The method for recovering ilmenite from low-grade titanium tailings as claimed in claim 1, characterized in that: In step b, the dielectric rod of the roughing strong magnetic machine is φ3mm and the magnetic induction intensity is 7500GS.

3. The method for recovering ilmenite from low-grade titanium tailings as claimed in claim 1, characterized in that: In step d, the dielectric rod of the scanning strong magnetic machine is φ1.5mm and the magnetic induction intensity is 6000GS.

4. The method for recovering ilmenite from low-grade titanium tailings as claimed in claim 1, 2 or 3, characterized in that: In step k, the medium rod of the selected strong magnetic machine is φ1.5mm and the magnetic induction intensity is 6000GS.