A beneficiation method of fine-grained harzburgite type ilmenite

Abstract

The application discloses a beneficiation method of fine-grained omphalite type ilmenite, and can realize efficient recovery of fine-grained omphalite type ilmenite, so that three kinds of flotation titanium concentrates with TiO2 grade of about 47% are obtained, including coarse-grained titanium concentrate, fine-grained titanium concentrate and ultra-fine-grained titanium concentrate, and the total recovery rate of the three kinds of titanium concentrates relative to fine-grained tailing ilmenite is above 50%. The application can improve the flotation-in grade of ilmenite, reduce the tailing grade and reduce the beneficiation cost of ilmenite by adopting the process to beneficiate fine-grained omphalite type ilmenite. The beneficiation process combines gravity separation, magnetic separation and flotation by using the cross effect and combined effect of multiple beneficiation methods, improves the recovery and utilization efficiency of ilmenite, and has obvious economic and social benefits, and can be popularized and applied at home and abroad.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ilmenite beneficiation, and particularly relates to a beneficiation method for fine-grained garnet peridotite type ilmenite. BACKGROUND

[0002] At present, the ilmenite in Panxi region is mainly recovered by using a process flow of 'classification + two-stage high-intensity magnetic separation + flotation' (as shown in the figure), and a titanium concentrate with a TiO2 grade of more than 47% can be obtained. Figure 1 Vanadium-titanium magnetite ore can be divided into five types, i.e., gabbro type, pyroxenite type, garnet peridotite type, olivine gabbro type and peridotite type, according to the content of main silicate minerals. The content of feldspar in the garnet peridotite type vanadium-titanium magnetite is low, the content of pyroxene minerals is 20-30% higher than that of the gabbro type, and the content of olivine minerals is 10-30% higher than that of the gabbro type. The magnetism of olivine and ilmenite is similar, and it is difficult to remove a large amount of interfering minerals in the high-intensity magnetic separation. The surface of olivine and ilmenite contains metal ions such as Fe 2+ , Ca 2+ , Mg 2+ , and the surface active points are similar, so the selectivity of the reagent is poor, resulting in great difficulty in flotation separation. The garnet peridotite type ilmenite is difficult to be recovered by using the conventional high-intensity magnetic separation and flotation process due to the influence of olivine, so that the grade and recovery rate of the final titanium concentrate are not ideal, the cost of the flotation reagent is high, and the purpose of economically and efficiently utilizing the titanium resource cannot be achieved.

[0003] At present, the ilmenite with a particle size of less than 0.074 mm and greater than 0.038 mm is mainly recovered by using a process flow of 'two-stage high-intensity magnetic separation + flotation', but the current beneficiation process is difficult to efficiently recover the ilmenite with a particle size of less than 0.038 mm, and the titanium recovery rate is very low. With the improvement of the beneficiation process and the decrease of the grinding fineness, a large amount of garnet peridotite type ilmenite with a super-fine particle size cannot be recovered, resulting in a low ilmenite recovery rate and a high recovery cost. SUMMARY

[0004] The present application aims to provide a new beneficiation process for fine-grained garnet peridotite type ilmenite, which can improve the flotation-in grade of fine-grained ilmenite, reduce the grade of tailings titanium, reduce the beneficiation cost of ilmenite and improve the recovery rate of ilmenite. The beneficiation process combines gravity separation, magnetic separation and flotation by using the cross effect and combined effect of multiple beneficiation methods, improves the recovery and utilization efficiency of fine-grained garnet peridotite type ilmenite, and has obvious economic and social benefits, and can be popularized at home and abroad.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme:

[0006] A beneficiation method for fine-grained garnet peridotite type ilmenite, the method comprising:

[0007] the fine-grained tailings are subjected to one-stage concentration;

[0008] the settled sand of the one-stage concentration is subjected to one-stage cyclone classification after one-stage iron removal;

[0009] the settled sand of the one-stage cyclone classification is subjected to gravity separation to obtain first material of a certain titanium grade;

[0010] the first material is subjected to classification grinding to obtain second material of a certain fineness;

[0011] the second material is subjected to two-stage iron removal, and then subjected to sulfur flotation and titanium flotation in sequence to obtain coarse-grained titanium concentrate;

[0012] the overflow of the one-stage cyclone classification is subjected to high-intensity magnetic separation;

[0013] the high-intensity magnetic concentrate is subjected to two-stage concentration;

[0014] the settled sand of the two-stage concentration is subjected to sulfur flotation and titanium flotation in sequence to obtain fine-grained titanium concentrate;

[0015] the gravity separation tailings and the high-intensity magnetic tailings are subjected to three-stage cyclone classification;

[0016] the overflow of the three-stage cyclone classification, the overflow of the one-stage concentration, and the overflow of the two-stage concentration are subjected to three-stage concentration;

[0017] the settled sand of the three-stage concentration is subjected to cyclone desliming, and then subjected to sulfur flotation and titanium flotation in sequence to obtain ultra-fine-grained titanium concentrate.

[0018] As a further improvement of the present application, the fine-grained tailings are:

[0019] fine-grained ilmenite of the garnet type, with the proportion of material particles with a particle size of less than 0.074 mm being 50% to 90%.

[0020] As a further improvement of the present application, the magnetic field strength of the one-stage and two-stage iron removal is 0.1 to 0.3 T;

[0021] the classification size of the one-stage cyclone is 0.1 to 0.045 mm.

[0022] As a further improvement of the present application, the gravity separation of the settled sand of the one-stage cyclone classification to obtain first material of a certain titanium grade includes:

[0023] the settled sand of the one-stage cyclone classification is subjected to one roughing, two scavenging, and one cleaning in sequence;

[0024] the middlings and tailings obtained by the cleaning are subjected to the one roughing, two scavenging, and one cleaning again until the first material of the certain titanium grade is obtained.

[0025] As a further improvement of the present application, the titanium grade of the first material is 10% to 20%.

[0026] As a further improvement of the present application, the grading grinding of the first material to obtain the second material with a certain fineness includes:

[0027] The first material is sequentially subjected to two-stage cyclone grading and fine screen grading;

[0028] The two-stage cyclone sand and fine screen oversize material is subjected to tower grinding;

[0029] The material after tower grinding is subjected to the two-stage cyclone grading and fine screen grading again until the second material with a certain fineness is obtained.

[0030] As a further improvement of the present application, the two-stage cyclone grading size and fine screen grading screen size are both 0.154 to 0.1 mm.

[0031] As a further improvement of the present application, the strong magnetic treatment of the overflow of the one-stage cyclone grading includes:

[0032] The overflow of the one-stage cyclone grading is sequentially subjected to strong magnetic roughing and strong magnetic scavenging;

[0033] The magnetic field strength of the strong magnetic roughing and strong magnetic scavenging is 0.7 to 1.3 T.

[0034] As a further improvement of the present application, the grading size of the three-stage cyclone is 0.045 to 0.038 mm, and the grading size of the desliming cyclone is 0.02 to 0.01 mm.

[0035] As a further improvement of the present application, the sulfur flotation includes one roughing and one to three scavengings.

[0036] The titanium flotation includes one roughing and two to four cleanings.

[0037] The technical effects and advantages of the present application are:

[0038] Compared with the current titanium-iron ore separation process in the region, the beneficiation method of the fine-grained harzburgite type ilmenite of the application sets a cyclone grading operation after the fine-grained tailings after iron removal are concentrated, and the sand after grading is subjected to gravity separation, which can effectively remove the olivine and other interfering minerals similar to the magnetic properties of ilmenite, and can also improve the grade of ilmenite enrichment and reduce the grade of fine-grained gravity separation tailings; the gravity separation concentrate is subjected to grading and grinding after iron removal to obtain the floatation feed material, which can realize accurate control of the particle size of the floatation feed material; the ultra-fine particle level in the gravity separation tailings and the high-intensity magnetic tailings is difficult to recover by using the conventional process, and the ultra-fine particle level ilmenite separation system in the application separately recovers the gravity separation tailings, the high-intensity magnetic tailings and the ultra-fine particle material obtained after the first-stage concentration, thereby further improving the recovery rate of ilmenite; at the same time, the desliming cyclone after concentration is used in the ultra-fine particle separation to remove the slime and improve the floatation grade, thereby effectively reducing the flotation difficulty. The process of the application can separately separate the fine-grained harzburgite type ilmenite of the narrow particle size to obtain three kinds of titanium concentrate with different particle sizes, i.e., the coarse-grained titanium concentrate, the fine-grained titanium concentrate and the ultra-fine-grained titanium concentrate with a TiO2 grade of about 47%, and the total recovery rate of the three kinds of titanium concentrate from the fine-grained tailings is more than 50%; thereby realizing the efficient and high-recovery deep recovery of the fine-grained harzburgite type ilmenite, and the economic and social benefits are obvious.

[0039] Other features and advantages of the present application will be set forth in the following description, and in part will become apparent to those skilled in the art from the description, or can be learned by practice of the present application. The objects and other advantages of the present application will be realized and attained by the structures particularly pointed out in the written description and the appended drawings. BRIEF DESCRIPTION OF DRAWINGS

[0040] Figure 1 It is a schematic diagram of the titanium-iron ore separation process in the prior art;

[0041] Figure 2 It is a schematic diagram of the beneficiation method of the fine-grained harzburgite type ilmenite of the application. DETAILED DESCRIPTION

[0042] The technical solutions in the embodiments of the application will be apparently and completely described below with reference to the drawings in the embodiments of the application. Obviously, the described embodiments are only part of the embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all the other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the application.

[0043] To achieve the above-mentioned object, the application provides a beneficiation method of fine-grained harzburgite type ilmenite, and the process flow is as follows Figure 2The process includes the following steps: the fine-grained tailings of the lamproite type vanadium-titanium magnetite (the proportion of material particles with a particle size of less than 0.074 mm is 50% to 90%) is subjected to one-stage concentration, the settled sand after the one-stage concentration is subjected to one-stage iron removal, the tailings after the one-stage iron removal is subjected to one-stage cyclone classification, the settled sand after the one-stage cyclone classification is subjected to spiral chute reselection, the spiral reselection can adopt a one-roughing-two-scavenging-one-precipitation process, the middlings and tailings after the spiral reselection are returned to the spiral feed, until the spiral concentrate with a titanium grade of 10% to 20% is obtained. The spiral concentrate is subjected to combined classification composed of a two-stage cyclone and a fine screen, the settled sand of the two-stage cyclone and the screen upper part of the fine screen are subjected to tower mill grinding and then returned to the two-stage cyclone feed, until the fineness of the material under the fine screen reaches the proportion of 50% to 90% of material particles with a particle size of less than 0.074 mm. Subsequently, the material under the fine screen is subjected to two-stage iron removal, and the tailings after the two-stage iron removal are subjected to sulfur flotation and titanium flotation to obtain coarse-grained titanium concentrate. The overflow after the one-stage cyclone classification is subjected to high-intensity magnetic roughing and scavenging, the high-intensity magnetic scavenging is to recover the unrecovered single-body ilmenite and ilmenite-rich intergrowth in the tailings of the high-intensity magnetic roughing and improve the recovery rate of the high-intensity magnetic separation, the concentrate of the high-intensity magnetic roughing and the scavenging concentrate are combined into high-intensity magnetic concentrate, and the high-intensity magnetic concentrate is subjected to two-stage concentration, and the settled sand after the two-stage concentration is subjected to sulfur flotation and titanium flotation to obtain fine-grained titanium concentrate. The tailings of the spiral reselection and the tailings of the high-intensity magnetic scavenging are combined together and subjected to three-stage cyclone classification, the settled sand after the three-stage cyclone classification is the final tailings of the reselection, and the overflow after the three-stage cyclone classification is combined together with the overflow after the one-stage concentration and the two-stage concentration and subjected to three-stage concentration, and the settled sand after the three-stage concentration is subjected to desliming in a desliming cyclone, and the settled sand of the desliming cyclone is subjected to sulfur flotation and titanium flotation to obtain ultra-fine-grained titanium concentrate.

[0044] Specifically, to achieve the best processing effect of the present application, the specific parameters of the main operations of the process of the present application are as follows: the preferred magnetic field strength of the one-stage iron removal is 0.1 to 0.3 T; the size of the one-stage cyclone classification is 0.1 to 0.045 mm, and is further preferably 0.074 mm; the preferred magnetic field strength of the high-intensity magnetic roughing and the high-intensity magnetic scavenging is 0.7 to 1.3 T; the size of the two-stage cyclone classification and the size of the screen hole of the fine screen classification is 0.154 to 0.1 mm; the grinding fineness of the tower mill is 50% to 90% of the proportion of -0.074 mm, and the preferred magnetic field strength of the two-stage iron removal is 0.1 to 0.3 T; the size of the three-stage cyclone classification is 0.045 to 0.038 mm, and the size of the desliming cyclone classification is 0.02 to 0.01 mm; the sulfur flotation is preferably one roughing and one to three scavenging, and the titanium flotation is preferably one roughing and two to four precipitations.

[0045] The innovation points of the process of the application mainly include: a cyclone grading operation is arranged after the fine particle tailings after iron removal, to ensure that the relatively coarse part of the fine particle tailings enters the gravity separation, the addition of gravity separation here can effectively remove the interfering minerals such as olivine similar to the magnetism of ilmenite, and can also improve the grade of ilmenite enrichment, and reduce the grade of fine particle gravity separation tailings, at the same time, most of the fine particle materials in the fine particle tailings enter the high-intensity magnetic flotation separation system; secondly, the cyclone sand and the fine screen oversize after the combined grading of the spiral concentrate enter the tower mill for grinding, compared with the ball mill, the fine particle ilmenite is reduced in over-grinding; thirdly, the overflow after the cyclone grading of the gravity separation tailings and the high-intensity magnetic tailings enters the ultra-fine particle separation system, to increase the recovery rate of ilmenite; fourthly, the desliming cyclone is used for desliming in the ultra-fine particle ilmenite separation, to reduce the difficulty of flotation; fifthly, the narrow particle size separation is used to obtain three kinds of flotation ilmenite concentrates with TiO2 grade of about 47%, including coarse particle ilmenite concentrate, fine particle ilmenite concentrate and ultra-fine particle ilmenite concentrate, and the total recovery rate of ilmenite relative to the fine particle tailings can reach more than 50%.

[0046] In summary, the mineral processing method of the fine particle harzburgite type ilmenite of the application can realize efficient recovery of the fine particle harzburgite type ilmenite, and can obtain three kinds of flotation ilmenite concentrates with TiO2 grade of about 47%, including coarse particle ilmenite concentrate, fine particle ilmenite concentrate and ultra-fine particle ilmenite concentrate, and the total recovery rate of ilmenite relative to the fine particle tailings is more than 50%. The process of the application can improve the flotation grade of ilmenite, reduce the tailings grade and reduce the mineral processing cost of ilmenite, the mineral processing process combines gravity separation, magnetic separation and flotation by using the cross effect and combined effect of multiple mineral processing methods, to improve the recovery and utilization efficiency of ilmenite, and the economic and social benefits are obvious, and the process can be popularized at home and abroad.

[0047] Finally, it should be noted that: the above only describes the preferred embodiments of the application, and is not used to limit the application, although the application has been described in detail with reference to the foregoing embodiments, for those skilled in the art, the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced, any modification, equivalent replacement, improvement, etc. within the spirit and principles of the application, should be included in the protection scope of the application.

Claims

1. A beneficiation method of fine-grained harzburgite-type ilmenite, characterized by, The method comprises: carrying out one-stage concentration on fine particle tailings, the fine particle tailings being fine granulite type ilmenite with a proportion of material particles with a particle size of less than 0.074 mm being 50% to 90%; carrying out one-stage cyclone classification on the settled sand of the one-stage concentration after one-stage iron removal, the classification size of the one-stage cyclone being 0.1 to 0.045 mm; carrying out gravity separation on the settled sand of the one-stage cyclone classification to obtain first material with a certain titanium grade; carrying out classified grinding on the first material to obtain second material with a certain fineness; carrying out sulfur flotation and titanium flotation in sequence on the second material after two-stage iron removal to obtain coarse-grained titanium concentrate; carrying out strong magnetic separation on the overflow of the one-stage cyclone classification; carrying out two-stage concentration on the strong magnetic concentrate; carrying out sulfur flotation and titanium flotation in sequence on the settled sand of the two-stage concentration to obtain fine-grained titanium concentrate; carrying out three-stage cyclone classification on the gravity separation tailings and the strong magnetic tailings; carrying out three-stage concentration on the overflow of the three-stage cyclone classification, the one-stage concentration and the two-stage concentration; carrying out sulfur flotation and titanium flotation in sequence on the settled sand of the three-stage concentration after cyclone desliming to obtain ultra-fine-grained titanium concentrate.

2. The fine granulite type ilmenite beneficiation method according to claim 1, characterized in that: the magnetic field strength of the one-stage and two-stage iron removal is 0.1 to 0.3 T.

3. The beneficiation method of fine-grained harzburgite-type ilmenite according to claim 1, characterized by, The gravity separation on the settled sand of the one-stage cyclone classification to obtain first material with a certain titanium grade comprises: carrying out primary roughing, secondary scavenging and primary concentration in sequence on the settled sand of the one-stage cyclone classification; re-performing the primary roughing, secondary scavenging and primary concentration on the middlings and tailings obtained by the concentration until the first material with the certain titanium grade is obtained.

4. The fine granulite type ilmenite beneficiation method according to claim 1 or 3, characterized in that: the titanium grade of the first material is 10% to 20%.

5. The beneficiation method of fine-grained harzburgite-type ilmenite according to claim 1, characterized in that, The classified grinding on the first material to obtain second material with a certain fineness comprises: carrying out two-stage cyclone classification and fine screen classification in sequence on the first material; carrying out tower grinding on the two-stage cyclone settled sand and the fine screen oversize material; re-performing the two-stage cyclone classification and fine screen classification on the tower ground material until the second material with the certain fineness is obtained.

6. The fine granulite type ilmenite beneficiation method according to claim 5, characterized in that: the classification size of the two-stage cyclone and the screen hole size of the fine screen classification are both set to be 0.154 to 0.1 mm.

7. The beneficiation method of fine-grained harzburgite-type ilmenite according to claim 1, characterized by, The strong magnetic separation on the overflow of the one-stage cyclone classification comprises: carrying out strong magnetic roughing and strong magnetic scavenging in sequence on the overflow of the one-stage cyclone classification; the magnetic field strength of the strong magnetic roughing and the strong magnetic scavenging is set to be 0.7 to 1.3 T.

8. The fine granulite type ilmenite beneficiation method according to claim 1, characterized in that: the classification size of the three-stage cyclone is 0.045 to 0.038 mm, and the classification size of the desliming cyclone is 0.02 to 0.01 mm.

9. The fine granulite type ilmenite beneficiation method according to claim 1, characterized in that: the sulfur flotation comprises primary roughing and one to three times of scavenging; the titanium flotation comprises primary roughing and two to four times of concentration.

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