CN111729754B

CN111729754B - Beneficiation method for producing titanium concentrate by utilizing ilmenite

Info

Publication number: CN111729754B
Application number: CN202010656069.5A
Authority: CN
Inventors: 李金�; 谭世国; 罗荣飞; 张国平; 黄利
Original assignee: Pangang Group Mining Co Ltd
Current assignee: Pangang Group Mining Co Ltd
Priority date: 2020-07-09
Filing date: 2020-07-09
Publication date: 2022-03-22
Anticipated expiration: 2040-07-09
Also published as: CN111729754A

Abstract

The invention relates to a beneficiation method for producing titanium concentrate by utilizing ilmenite, and belongs to the technical field of beneficiation. The invention comprises the following steps: the method comprises the steps of rough concentration with strong magnetism → classification with grinding ore → concentration with strong magnetism → flotation, classification with a sieving machine, classification with the sieving machine, under-sieve material entering the strong magnetism concentration separation, returning the over-sieve material to the ball mill for ball milling, delivering the material to the feeding end of the sieving machine, forming the closed circulation of classification with grinding ore, the sieving net of the sieving machine is sequentially arranged into an upper sieving area and a lower sieving area along the inclined direction, the upper end of the upper sieving area is the feeding end, the upper sieving area adopts the sieving net with the sieving aperture of 0.15mm, the lower sieving area adopts the sieving net with the sieving aperture of 0.18 mm. The strong magnetic rough concentration in the invention adopts a combined screen of a screen with the upper part of 0.15mm and a screen with the lower part of 0.18mm for grading treatment, thus improving the screening efficiency and reducing the production cost.

Description

Beneficiation method for producing titanium concentrate by utilizing ilmenite

Technical Field

The invention relates to a beneficiation method for producing titanium concentrate by utilizing ilmenite, and belongs to the technical field of beneficiation.

Background

At present, the ilmenite in the iron tailings of the vanadium titano-magnetite separation is generally recovered by adopting the technological processes of strong magnetic roughing, grinding classification, strong magnetic concentration and flotation in domestic large titanium separation plants. According to the requirement of granularity of flotation, rough concentrate obtained by the strong magnetic rough separation of titanium is generally treated by a high-frequency fine sieve according to the process of '0.15 mm or 0.18mm sieve classification → ball milling and regrinding on the sieve → strong magnetic fine separation under the sieve'. In the actual operation process, the upper limit of the flotation granularity of the ilmenite is usually controlled to be 0.15mm due to the influence of factors such as the performance of flotation equipment, the chemical regulation and the like. If a 0.15mm screen is singly adopted for grading the strong magnetic rough concentrate, the screening efficiency is low, the oversize mineral quantity is large, and the load of a ball milling grading system is increased, so that the ore grinding cost is increased and the flotation difficulty is increased after part of minerals are over-ground; if a 0.18mm screen is singly adopted to classify the strong magnetic rough concentrate, the screening efficiency is improved, but after minerals with the size of more than 0.15mm are obviously increased, the operation difficulty is increased and the medicament consumption is increased after the flotation granularity is thickened, and the flotation recovery rate is reduced. In the ore grinding and grading process, the adopted screen is a finished product directly purchased, and currently, in domestic screening equipment production enterprises, the universal screen has the aperture specification of 0.12mm, 0.15mm, 0.18mm, 0.20mm and the like, and no screen with other specifications can be selected between 0.15mm and 0.18 mm. If a special customized mode is adopted, the mold opening cost is generated, and the production cost is greatly increased.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: the beneficiation method for producing the titanium concentrate by utilizing the ilmenite is capable of improving the screening efficiency and reducing the production cost.

In order to solve the technical problems, the invention adopts the technical scheme that: the beneficiation method for producing the titanium concentrate by utilizing the ilmenite comprises the following steps: the method comprises the steps of rough concentration with strong magnetism → classification with grinding ore → concentration with strong magnetism → flotation, classification with a sieving machine, classification with the sieving machine, under-sieve material entering the strong magnetism concentration separation, returning the over-sieve material to the ball mill for ball milling, delivering the material to the feeding end of the sieving machine, forming the closed circulation of classification with grinding ore, the sieving net of the sieving machine is sequentially arranged into an upper sieving area and a lower sieving area along the inclined direction, the upper end of the upper sieving area is the feeding end, the upper sieving area adopts the sieving net with the sieving aperture of 0.15mm, the lower sieving area adopts the sieving net with the sieving aperture of 0.18 mm.

Further, the method comprises the following steps: the width of the upper screening area is the same as that of the lower screening area, the ratio of the length of the upper screening area to that of the lower screening area is 1: 2-2: 1, and the length of the screening area refers to the linear length of the screening area along the inclination direction of the screen.

Further, the method comprises the following steps: the length of the upper screening zone is the same as the length of the lower screening zone.

Further, the method comprises the following steps: the screen cloth of upper portion sieve subregion and lower part sieve subregion all adopts the individual layer polyurethane screen cloth, installs in the frame through the reel.

Further, the method comprises the following steps: the screening machine adopts a high-frequency fine screen.

Further, the method comprises the following steps: TiO of ferrotitanium concentrate after strong magnetic roughing₂The grade is 10 to 20 percent.

The invention has the beneficial effects that: after the high-intensity magnetic roughing concentrate is subjected to classification treatment by a combined screen of a screen with the upper part of 0.15mm and a screen with the lower part of 0.18mm, compared with the traditional method of singly adopting the screen with the 0.15mm for classification, the method has the advantages that the screening efficiency is improved, and the ore grinding cost is reduced; in the flotation process, the flotation granularity is more reasonable, so that the flotation recovery rate is improved, the medicament consumption is reduced, and the comprehensive utilization rate of titanium resources is improved.

Drawings

FIG. 1 is a process flow diagram of the present invention;

FIG. 2 is a schematic diagram of the structure of a screen according to the present invention;

parts in the figures are labeled: 1-0.15mm screen mesh, 2-0.18mm screen mesh and 3-screen frame.

Detailed Description

The invention is further explained below with reference to the drawings and examples.

As shown in fig. 1 and 2, the present invention, when implemented, comprises the following steps: the method comprises the steps of rough concentration with strong magnetism, classification with a screening machine, fine concentration with strong magnetism, and flotation, wherein the classification with the strong magnetism comprises the steps of rough concentration with ferrotitanium concentrate with strong magnetism as raw ore, classifying the rough concentration with the screening machine, sorting undersize with the fine concentration with strong magnetism, returning oversize with the ball mill for ball milling, delivering the ball milled material to the feeding end of the screening machine, forming a closed cycle of classification with grinding ore, setting the screen of the screening machine into an upper screening area and a lower screening area along the inclination direction of the screen in sequence, setting the upper end of the upper screening area as the feeding end, setting the upper screening area with a screen with a screening aperture of 0.15mm, and setting the lower screening area with a screen with a screening aperture of 0.18 mm.

In practice, the width of the upper screening zone is the same as that of the lower screening zone, the ratio of the length of the upper screening zone to that of the lower screening zone is 1: 2-2: 1 (namely, the length of the upper screening zone accounts for 1/3-2/3 of the total length of the screening zone), and the length of the screening zone refers to the linear length of the screening zone along the inclination direction of the screen, and correspondingly, on the screening surface, the length direction perpendicular to the screening zone is the width direction of the screening zone. For ease of implementation, the length of the upper screening zone is preferably designed to be the same as the length of the lower screening zone in this embodiment.

In order to make the structure simple and practical, the screen cloth of the upper screening zone (namely, the 0.15mm screen cloth 1 shown in figure 2) and the screen cloth of the lower screening zone (namely, the 0.18mm screen cloth 2 shown in figure 2) adopt a single-layer polyurethane screen cloth, and in the implementation, the screen cloth is installed on a frame through a screen frame 3.

In order to have better implementation effect, TiO of the ferrotitanium concentrate after strong magnetic roughing is adopted in the production process₂The grade is preferably controlled to be 10-20%; the screening machine preferably adopts a high-frequency fine screen.

Comparative example 1:

in a certain ilmenite separation plant, a high-frequency fine sieve is adopted to carry out classification on rough concentrate obtained by carrying out rough titanium separation by strong magnetic separation by using a 0.15mm sieve, the screening efficiency is only about 50%, the load of a ball milling classification system is increased, and the circulating load rate of a ball mill reaches 350%. The flotation recovery rate of the next flotation procedure is 83-85%.

Comparative example 2:

the rough concentrate obtained by the strong magnetic rough separation of titanium is classified by a 0.18mm screen mesh by adopting a high-frequency fine screen, other process conditions are the same as those of the comparative example 1, the screening capacity efficiency is improved, the load of a ball-milling classification system is reduced, but minerals with the size of more than 0.15mm are obviously increased, the operation difficulty is increased after the flotation granularity is thickened, compared with the comparative example 1, the unit consumption of main agents (titanium collecting agents, sulfuric acid and diesel oil) is increased by 2-3%, and the flotation recovery rate is reduced by about 3%.

Example (b):

the coarse concentrate obtained by the strong magnetic rough separation and titanium separation is classified by installing a 0.15mm screen in the upper screening area and a 0.18mm screen in the lower screening area of the high-frequency fine screen, undersize materials enter the strong magnetic fine separation and separation, and oversize materials return to a ball mill for regrinding, so that the grinding and classification closed cycle is formed. Other process conditions were the same as in comparative examples 1 and 2. When the method is implemented, the screening efficiency reaches about 60%, the circulating load rate of the ball mill is normally about 300%, the ore grinding cost is reduced, the flotation granularity composition is more reasonable, the flotation recovery rate reaches about 85% of the normal level, and the comprehensive utilization rate of titanium resources is improved. Compared with the comparative example 2, the unit consumption of the main medicament (titanium collector, sulfuric acid and diesel oil) is reduced by 3 percent.

Claims

1. The beneficiation method for producing the titanium concentrate by utilizing the ilmenite comprises the following steps: the method comprises the following steps of rough concentration with strong magnetism → classification with grinding, selection with strong magnetism → flotation, and classification with grinding, wherein ferrotitanium concentrate after rough concentration with strong magnetism is used as raw ore, classification is carried out by a sieving machine, undersize enters strong magnetism selection, and oversize returns to a ball mill for ball milling, and the material after ball milling is conveyed to the feeding end of the sieving machine to form closed circulation of classification with grinding, and the method is characterized in that: the screen cloth of screening machine sets gradually into upper portion sieve subregion and lower part sieve subregion along its incline direction, and the upper end in upper portion sieve subregion is the feed end, and upper portion sieve subregion adopts the screen cloth that screening aperture is 0.15mm, and lower part sieve subregion adopts the screen cloth that screening aperture is 0.18 mm.

2. The beneficiation method for producing titanium concentrate using ilmenite according to claim 1, characterized in that: the width of the upper screening area is the same as that of the lower screening area, the ratio of the length of the upper screening area to that of the lower screening area is 1: 2-2: 1, and the length of the screening area refers to the linear length of the screening area along the inclination direction of the screen.

3. The beneficiation method for producing titanium concentrate using ilmenite according to claim 2, characterized in that: the length of the upper screening zone is the same as the length of the lower screening zone.

4. The beneficiation method for producing titanium concentrate using ilmenite according to claim 1, characterized in that: the screen cloth of upper portion sieve subregion and lower part sieve subregion all adopts the individual layer polyurethane screen cloth, installs in the frame through the reel.

5. The beneficiation method for producing titanium concentrate using ilmenite according to claim 1, characterized in that: the screening machine adopts a high-frequency fine screen.

6. The beneficiation process to produce titanium concentrate using ilmenite according to any one of claims 1 to 5, wherein: TiO of ferrotitanium concentrate after strong magnetic roughing₂The grade is 10 to 20 percent.