Flotation method for vanadium titano-magnetite ilmenite

Abstract

The invention discloses a flotation method, particularly discloses a flotation method for vanadium titano-magnetite ilmenite, and belongs to the technical field of mineral separation processes in metallurgical production. The flotation method for the vanadium titano-magnetite ilmenite can effectively improve the titanium concentrate recovery rate and the titanium concentrate grade and reduce the reagent use cost. The flotation method comprises ilmenite direct flotation, and according to the flotation method, titanium concentrate obtained through ilmenite direct flotation serves as a working object to be sequentially subjected to at least one time of rotational flow classification desliming and at least one time of rotational flow concentration desliming. And finally, ilmenite direct flotation is conducted on the coarse grain part in the fine-grain low-grade titanium concentrate obtained through rotational flow concentration and desliming, fine-grain high-grade titanium concentrate is obtained, and beneficiation work of flotation of the titanium concentrate is completed, the working object of the rotational flow concentration desliming is the fine-fraction gangue-containing mineral overproof low-grade titanium concentrate discharged by the rotational flow classification equipment in an overflowing manner during each rotational flow classification desliming.

Description

Technical Field

[0001] The invention relates to a flotation method, in particular to a flotation method for vanadium-titanium magnetite ilmenite, and belongs to the technical field of metallurgical production mineral separation process. Background Art

[0002] At present, oleic acid compound collectors are generally used for positive flotation in the field of vanadium-titanium magnetite ilmenite flotation. Since the gangue of the flotation ore is mainly composed of titanium pyroxene or olivine, the gangue contains a certain amount of iron and titanium, which will react with the collector on the surface. Therefore, the floatability of the gangue is similar to that of the target mineral ilmenite, resulting in relatively greater difficulty in flotation, especially the particle size of the flotation ore is generally distributed widely. The gangue of titanium pyroxene or olivine in the fine-grained part is easy to be mechanically entrained into the titanium concentrate with the foam during the flotation process due to the large specific surface area and the viscosity of water. Reduce the grade of the titanium concentrate or reduce the recovery rate of the titanium concentrate and increase the amount of collector. In order to reduce this problem in actual flotation, it is forced to use pre-flotation desludging, also known as de-finement, to reduce the particle size distribution width, increase the amount of sulfuric acid, etc. to improve selectivity and reduce the floating amount of coarse-grained ilmenite and its intergrowth, and finally be forced to reduce the total recovery rate of the flotation titanium concentrate. Sometimes, due to the wide distribution of particle size composition of flotation ore, it is difficult for the grade of titanium concentrate to meet the qualified requirements. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide a flotation method for vanadium-titanium magnetite and ilmenite, which can effectively improve the recovery rate and grade of titanium concentrate and reduce the cost of reagent use.

[0004] The technical solution adopted to solve the above technical problems is: a flotation method for vanadium-titanium magnetite ilmenite, including ilmenite positive flotation, the flotation method takes the titanium concentrate obtained by the ilmenite positive flotation as the working object, sequentially performs at least one cyclone classification desludging and at least one cyclone concentration desludging, and finally performs ilmenite positive flotation on the coarse-grained part of the fine-grained low-grade titanium concentrate obtained by the cyclone concentration desludging to obtain the fine-grained high-grade titanium concentrate therein to complete the flotation titanium concentrate beneficiation work,

[0005] Among them, the object of cyclone concentration and desludging is the low-grade titanium concentrate containing excessive gangue minerals in the fine-grained state discharged from the overflow of the cyclone classification equipment during each cyclone classification and desludging.

[0006] Furthermore, both cyclone classification desludging and cyclone concentration desludging are performed using a classification cyclone.

[0007] The preferred embodiment of the above scheme is that when the fine-grained low-grade titanium concentrate containing excessive gangue minerals removed by graded desliming is re-concentrated and deslimed, it is completed through a graded cyclone based on the particle size and main components of the flotation titanium concentrate.

[0008] Furthermore, when a grading cyclone is used to grade and deslim the flotation titanium concentrate and when a cyclone is used to concentrate and deslim the fine-grained low-grade titanium concentrate, the main component of the sorting is the difference in specific gravity between titanium pyroxene and / or olivine and ilmenite. A preferred embodiment of the above scheme is to perform secondary cyclone concentration and desliming on the low-grade fine-grained titanium concentrate containing excessive gangue minerals, and then flotate the coarse-grained ilmenite at least once to obtain a fine-grained high-grade titanium concentrate.

[0009] Furthermore, the flotation of the coarse-grained ilmenite obtained by the secondary cyclone concentration and desliming is performed separately for no more than five times depending on the grade of the obtained fine-grained titanium concentrate.

[0010] The preferred embodiment of the above scheme is that the coarse ilmenite after the secondary and subsequent cyclone concentration and desliming is fed into an ultrafine titanium flotation line with a suitable particle size for flotation to obtain ultrafine titanium concentrate.

[0011] Furthermore, during each cyclone classification and desludging, the sand settling portion of the classification cyclone is high-quality coarse-grained titanium concentrate.

[0012] The beneficial effect of the present invention is that the technical scheme provided by the present application takes the titanium concentrate obtained by the positive flotation of ilmenite as the working object, and sequentially performs at least one cyclone classification desludging and at least one cyclone concentration desludging, and finally performs ilmenite positive flotation on the coarse-grained part of the fine-grained low-grade titanium concentrate obtained by the cyclone concentration desludging to obtain the fine-grained high-grade titanium concentrate therein to complete the flotation titanium concentrate beneficiation work, wherein the operation object of the cyclone concentration desludging is the fine-grained low-grade titanium concentrate containing excessive gangue minerals discharged by the overflow of the cyclone classification high equipment during each cyclone classification desludging. In this way, the titanium concentrate obtained by the direct flotation of ilmenite is first subjected to cyclone classification and desludging, and then subjected to cyclone concentration and desludging, thereby separating the gangue minerals in the fine-grained titanium concentrate step by step, thereby effectively improving the distribution range of the particle size of the flotation ilmenite concentrate, and producing a titanium-titanium concentrate of higher quality. This avoids the occurrence of the situation in the prior art that the grade of the titanium concentrate is reduced or the recovery rate of the titanium concentrate is reduced due to the fine-grained gangue being mechanically entrained into the titanium concentrate along with the foam during the direct flotation of ilmenite, thereby achieving the purpose of effectively improving the recovery rate and grade of the titanium concentrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The present invention is a flow chart of the flotation method for vanadium-titanium magnetite ilmenite. DETAILED DESCRIPTION

[0014] like Figure 1The present invention provides a flotation method for vanadium-titanium magnetite ilmenite, which can effectively improve the recovery rate and grade of titanium concentrate and reduce the cost of reagent use. The flotation method includes positive flotation of ilmenite, and the flotation method uses the titanium concentrate obtained by positive flotation of ilmenite as the working object to perform at least one cyclone classification desludging and at least one cyclone concentration desludging in sequence, and finally performs positive flotation of ilmenite on the coarse-grained part of the fine-grained low-grade titanium concentrate obtained by cyclone concentration desludging to obtain the fine-grained high-grade titanium concentrate therein to complete the flotation of titanium concentrate beneficiation work, wherein the operation object of cyclone concentration desludging is the low-grade titanium concentrate containing excessive gangue minerals in the fine-grained level discharged by the cyclone classification equipment during each cyclone classification desludging. In this way, the titanium concentrate obtained by the direct flotation of ilmenite is first subjected to cyclone classification and desludging, and then subjected to cyclone concentration and desludging, thereby separating the gangue minerals in the fine-grained titanium concentrate step by step, thereby effectively improving the distribution range of the particle size of the flotation ilmenite concentrate, and producing a titanium-titanium concentrate of higher quality. This avoids the occurrence of the situation in the prior art that the grade of the titanium concentrate is reduced or the recovery rate of the titanium concentrate is reduced due to the fine-grained gangue being mechanically entrained into the titanium concentrate along with the foam during the direct flotation of ilmenite, thereby achieving the purpose of effectively improving the recovery rate and grade of the titanium concentrate.

[0015] Accordingly, in combination with the prior art and the current status of existing equipment, in order to limit the bottom beneficiation cost to the maximum extent and improve the beneficiation quality at the same time, the present application adopts a grading cyclone for both cyclone classification desludging and cyclone concentration desludging, and when the fine-grained low-grade titanium concentrate containing excessive gangue minerals removed by the classification desludging is re-concentrated and desludged, it is completed by a grading cyclone based on the particle size and main components of the flotation titanium concentrate, wherein the particle size of the cyclone classification desludging is 600-800 mesh, and the particle size of each cyclone concentration desludging is 1200-1500 mesh. When a grading cyclone is used to grade and deslud the flotation titanium concentrate and to perform cyclone concentration desludging on the fine-grained low-grade titanium concentrate, the main component of the sorting is the difference in specific gravity between titanium pyroxene and / or olivine and ilmenite, and it is completed by gravity or centrifugal classification equipment. The present application provides the following two reprocessing methods for relatively coarse titanium concentrate obtained by desliming and concentrating fine-grained low-grade titanium concentrate containing excessive gangue minerals: one is to flotate at least once to obtain fine-grained high-grade titanium concentrate; the other is to flotate the ultrafine titanium flotation line with appropriate particle size to obtain ultrafine titanium concentrate. Of course, when the single flotation method is used for processing, the number of flotations shall not exceed five times according to the grade requirements of the obtained fine-grained titanium concentrate.

[0016] In summary, the technical solution of the present application solves the problems of high tailings grade, low titanium concentrate grade and low recovery rate, and high cost of flotation collector in the flotation line of ilmenite positive flotation under normal circumstances.

[0017] The technical solution of the present application is further described below through specific embodiments:

[0018] To achieve the above-mentioned purpose, in the field of vanadium-titanium magnetite ilmenite flotation, oleic acid compound collectors are generally used for positive flotation. The present application provides a flotation-related process flow to improve recovery efficiency and titanium concentrate grade and reduce reagents. The method is as follows: the flotation concentrate in the positive flotation of ilmenite is classified by a cyclone to remove most of the fine-grained low-grade titanium concentrate products, and then desludging and concentrating to obtain relatively coarse-grained fine-grained titanium concentrate products for 1 to 5 separate flotation concentrations. The total tailings of the fine-grained titanium concentrate are not returned to the original flotation process, or are fed to the ultra-fine titanium concentrate production line to further improve the grade of the fine-grained titanium concentrate.

[0019] Embodiment 1

[0020] The following is a detailed description of embodiments of the present invention.

[0021] The invention provides a method for improving the flotation recovery rate and the grade of titanium concentrate in the flotation of vanadium-titanium magnetite ilmenite.

[0022] The relevant process method for flotation of vanadium-titanium magnetite ilmenite provided in this specific embodiment is as follows: Figure 1 The flotation titanium concentrate in the ilmenite positive flotation is subjected to cyclone classification, and the technical characteristics of cyclone classification are brought into play, that is, the low-grade gangue minerals are preferentially fed into the fine-grained products of the cyclone classification overflow, and the fine-grained low-grade titanium concentrate products are separated out by classification, and the fine-grained low-grade titanium concentrate products are deslimed and concentrated again by cyclones and other process methods, and the relatively coarse-grained products obtained from the deslimed and concentrated fine-grained titanium concentrate products are subjected to 1 to 5 separate flotation concentrations, and the total tailings from the fine-grained titanium concentrate selection are not returned to the original flotation process.

[0023] The method provided in this specific embodiment can, through experiments, be used to improve the TiO2 grade of the original titanium concentrate by 0.5 to 1.0 percentage points through sedimentation obtained by cyclone classification under the same conditions. The relatively coarse-grained fine-grained titanium concentrate product formed by cyclone overflow classification is subjected to 1 to 5 separate flotation concentrations to improve the TiO2 grade by 2 to 8 percentage points. The TiO2 grade of the total floating titanium tailings is reduced by about 0.5 to 1 percentage point, the recovery rate is increased by about 3 to 5 percentage points, and the reagent cost is reduced by about 3 to 5%.

[0024] Preferably, the flotation titanium concentrate in the positive flotation of ilmenite is subjected to cyclone classification, and the technical characteristics of cyclone classification are brought into play, that is, low-grade gangue minerals are preferentially fed into the fine-grained products of cyclone classification, and the low-grade titanium concentrate products of fine-grained grade are separated by classification. After the fine-grained titanium concentrate products are concentrated and deslimed by cyclone classification and other processes, they are fed into the operation link of the ultra-fine titanium concentrate production line with similar grade and particle size, so as to further improve the grade of fine-grained titanium concentrate, and the process is relatively simple. The total TiO2 grade of floating titanium tailings is reduced by about 0.5 to 1 percentage point, the recovery rate is increased by about 3 to 5 percentage points, and the reagent cost is reduced by about 3 to 5%.

[0025] The innovative features of the present invention are as follows:

[0026] An economical and reasonable method to improve the flotation efficiency of vanadium-titanium magnetite ilmenite has been found. By classifying the cyclone of the positive flotation titanium concentrate, the technical characteristics of the cyclone classification have been brought into play, that is, the low-grade gangue minerals preferentially enter the fine-grained products of the cyclone classification overflow, which is beneficial to improve the grade of the coarse-grained titanium concentrate and reduce the grade of the fine-grained product concentrate during the two desludgings. The coarse and fine products are then processed separately, achieving efficient flotation of narrow-grained ilmenite.

Claims

1. A flotation method for vanadium-titanium magnetite ilmenite, including positive flotation of ilmenite, characterized in that: The flotation method uses the titanium concentrate obtained by the positive flotation of ilmenite as the working object, sequentially performs at least one cyclone classification desludging and at least one cyclone concentration desludging, and finally performs the ilmenite positive flotation on the coarse-grained part of the fine-grained low-grade titanium concentrate obtained by the cyclone concentration desludging to obtain the fine-grained high-grade titanium concentrate therein to complete the beneficiation of the flotation titanium concentrate. Among them, the object of cyclone concentration and desludging is the low-grade titanium concentrate containing excessive gangue minerals in the fine-grained state discharged from the overflow of the cyclone classification equipment during each cyclone classification and desludging.

2. The flotation method for vanadium-titanium magnetite ilmenite according to claim 1, characterized in that: Both cyclone classification desludging and cyclone concentration desludging are carried out using classification cyclones.

3. The flotation method for vanadium-titanium magnetite ilmenite according to claim 2, characterized in that: When the fine-grained low-grade titanium concentrate containing excessive gangue minerals removed by graded desliming is re-concentrated and deslimed, it is completed through a graded cyclone based on the particle size and main components of the flotation titanium concentrate.

4. The flotation method for vanadium-titanium magnetite ilmenite according to claim 1, 2 or 3, characterized in that: When a grading cyclone is used to grade and deslim the flotation titanium concentrate and when a cyclone is used to concentrate and deslim the fine-grained low-grade titanium concentrate, the main component of the sorting is the difference in specific gravity between titanium orthopyroxene and / or olivine and ilmenite.

5. The flotation method for vanadium-titanium magnetite ilmenite according to claim 4, characterized in that: The low-grade fine-grained titanium concentrate containing excessive gangue minerals is subjected to secondary cyclone concentration and desliming, and the coarse-grained ilmenite is then subjected to at least one separate flotation to obtain fine-grained high-grade titanium concentrate.

6. The flotation method for vanadium-titanium magnetite ilmenite according to claim 5, characterized in that: The number of flotation operations for the coarse-grained ilmenite obtained by secondary cyclone concentration and desliming shall not exceed five times depending on the grade of the fine-grained titanium concentrate obtained.

7. The flotation method for vanadium-titanium magnetite ilmenite according to claim 4, characterized in that: The coarse ilmenite after secondary and subsequent cyclone concentration and desludging is fed into an ultra-fine titanium flotation line with appropriate particle size for flotation to obtain ultra-fine titanium concentrate.

8. The flotation method for vanadium-titanium magnetite ilmenite according to claim 1, characterized in that: During each cyclone classification and desludging, the sand settling part of the classification cyclone is high-quality coarse-grained titanium concentrate.

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