Method for improving ilmenite flotation recovery rate of vanadium titano-magnetite

Abstract

The invention provides a method for improving the flotation recovery rate of ilmenite by vanadium titano-magnetite, which comprises the following steps: directly carrying out strong magnetic scavenging on ilmenite flotation tailings, or carrying out strong magnetic scavenging on the ilmenite flotation tailings after fine-fraction tailings are removed by grading to obtain strong magnetic concentrate; concentrating the strong magnetic concentrate and then carrying out ball milling; or the strong magnetic concentrate is subjected to spiral reselection for multiple times, and the obtained reselected concentrate is concentrated, then subjected to ball milling and ore grinding and then returned to the flotation process. According to the method, flotation, strong magnetism or gravity separation, ore grinding and other processes are crossed, high efficiency of vanadium titano-magnetite ilmenite flotation is achieved, and the problems that the coarse grain part in flotation tailings is high in grade and serious in loss are solved; and the problem of high reagent consumption is solved, and technical support is provided for flotation of vanadium titano-magnetite and ilmenite. The grade of tailings TiO2 is reduced by about 1%, the recovery rate is improved by about 5-8%, and the medicament cost is reduced by about 10%.

Description

Technical Field

[0001] The invention belongs to the technical field of flotation, and in particular relates to a method for improving the flotation recovery rate of ilmenite by vanadium-titanium magnetite. Background Art

[0002] In the field of vanadium-titanium magnetite ilmenite flotation, oleic acid compound collectors are generally used for positive flotation. Since the gangue of the flotation ore is mainly composed of titanium pyroxene, 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 titanium pyroxene in the gangue of the fine part is easily 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. This will 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 (or de-finement, reducing the width of the particle size distribution), increase the amount of sulfuric acid to reduce the floating amount of coarse-grained ilmenite and its intergrowth, and finally reduce the total recovery rate of the flotation titanium concentrate. Summary of the invention

[0003] In view of this, the purpose of the present invention is to provide a method for improving the flotation recovery rate of ilmenite from vanadium-titanium magnetite, which can reduce the difficulty of flotation of vanadium-titanium magnetite and ilmenite, improve the recovery rate of titanium concentrate, and reduce the cost of reagent use.

[0004] The present invention provides a method for improving the flotation of ilmenite by using vanadium-titanium magnetite, comprising the following steps:

[0005] The ilmenite flotation tailings are directly subjected to strong magnetic scavenging, or the ilmenite flotation tailings are graded to remove the fine-grained tailings and then subjected to strong magnetic scavenging to obtain strong magnetic concentrate;

[0006] The strong magnetic concentrate is concentrated and then ball milled; or the strong magnetic concentrate is subjected to multiple spiral gravity separations, and the obtained gravity separation concentrate is concentrated and then ball milled, and then returned to the flotation process after grinding.

[0007] Preferably, the coarse tailings after removing the -45 micron low-grade fine-grained fraction are subjected to high-intensity magnetic sweeping.

[0008] Preferably, the ilmenite flotation tailings classification is achieved by removing the low-grade fine particles of -45 microns through 1-2 cyclone classifications.

[0009] Preferably, the implementation method includes reducing the diameter of the cyclone sand settling port, adjusting the cyclone classification concentration or adjusting the cyclone classification times.

[0010] Preferably, the TiO2 grade of the ilmenite flotation tailings is 3-7%.

[0011] Preferably, the magnetic separation field strength of the strong magnetic sweep is 0.5-1.0 Tesla.

[0012] The present invention provides a method for improving the flotation recovery rate of ilmenite with vanadium-titanium magnetite, comprising the following steps: directly subjecting the flotation tailings of ilmenite to strong magnetic scavenging, or subjecting the flotation tailings of ilmenite to strong magnetic scavenging after grading and removing the fine-grained tailings, to obtain a strong magnetic concentrate; concentrating the strong magnetic concentrate and then ball milling; or subjecting the strong magnetic concentrate to spiral multiple gravity separation, concentrating the obtained gravity separation concentrate and then ball milling, and returning to the flotation process after grinding. The method realizes the high efficiency of flotation of vanadium-titanium magnetite and ilmenite by crossing flotation with strong magnetic or gravity separation, grinding and other processes, and solves the problem of high grade and serious loss of coarse particles in the flotation tailings. The conventional recovery process for comparison is: the flotation tailings are mixed with other tailings, and then strongly magnetic, the strong magnetic concentrate is fed into the cyclone feed port of the grinding system, the cyclone sand is fed into the ball mill for grinding, the cyclone overflow is fed into the high-frequency fine screen for classification, the screened material is returned to the mill for grinding, and the screened material enters the titanium concentrate flotation. Compared with the conventional process, the present invention reduces the grade of TiO2 in tailings by about 1 percentage point, increases the recovery rate by about 5 to 8 percentage points, and reduces the reagent cost by about 10%. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of a process for improving the flotation of ilmenite by using vanadium-titanium magnetite provided by the present invention. DETAILED DESCRIPTION

[0014] The present invention provides a method for improving the flotation recovery rate of ilmenite from vanadium-titanium magnetite, comprising the following steps:

[0015] The ilmenite flotation tailings are directly subjected to strong magnetic scavenging, or the ilmenite flotation tailings are graded to remove the fine-grained tailings and then subjected to strong magnetic scavenging to obtain strong magnetic concentrate;

[0016] The strong magnetic concentrate is concentrated and then ball milled; or the strong magnetic concentrate is subjected to multiple spiral gravity separations, and the obtained gravity separation concentrate is concentrated and then ball milled, and then returned to the flotation process after grinding.

[0017] The invention adopts a strong magnetic machine to carry out strong magnetic scavenging of tailings in the flotation process to obtain strong magnetic scavenging concentrate, and the strong magnetic scavenging concentrate is fed into a ball mill. In order to prevent the formation of an endless cycle, the strong magnetic concentrate is only concentrated separately before entering the mill and is not pre-classified by sharing a classification device with a grinding system. The concentrated strong magnetic scavenging concentrate is returned to the ilmenite flotation process to feed the ore after grinding and classification.

[0018] Through a large number of experiments, the present invention can reduce the total flotation tailings metal loss to the maximum extent, reduce the cost of reagent use, solve the problems of high flotation tailings grade and low titanium concentrate yield, and the final flotation tailings come out in the form of strong magnetic scavenging tailings and gravity separation tailings of the flotation tailings. After the strong magnetic scavenging tailings and the gravity separation tailings are mixed, the TiO2 grade of the comprehensive tailings is reduced by about 1 percentage point relative to the TiO2 grade of the original flotation tailings, the recovery rate is increased by about 5 to 8 percentage points, and the reagent cost is reduced by about 10% (because after optimization, the coarse particle part has the opportunity to be ground and recovered, the flotation difficulty is reduced, and the amount of reagent used is naturally reduced).

[0019] The invention classifies the flotation tailings first, removes the low-grade fine particles of -45 microns, and then conducts strong magnetic separation and scavenging of the coarse tailings. The ilmenite flotation tailings classification is achieved by 1-2 cyclone classifications; the implementation methods include reducing the diameter size of the cyclone sand settling port, adjusting the cyclone classification concentration, or adjusting the cyclone classification times.

[0020] The present invention preferably adopts a gravity separation process to improve the grade of the strong magnetic concentrate and reduce the subsequent grinding amount to obtain a gravity separation concentrate, which is then separately concentrated (without sharing the classification equipment with the grinding system for pre-classification) and fed into a mill for grinding. The product obtained after grinding is returned to the flotation feed.

[0021] Figure 1 A schematic diagram of a process for improving the flotation recovery rate of ilmenite by vanadium-titanium magnetite provided by the present invention; directly subjecting the flotation tailings of ilmenite to strong magnetic scavenging to obtain strong magnetic concentrate and strong magnetic tailings; or subjecting the flotation tailings of ilmenite to graded desludging, and subjecting the coarse particles after the fine mud is removed to strong magnetic scavenging to obtain strong magnetic concentrate and strong magnetic tailings;

[0022] In order to prevent an endless cycle, the strong magnetic concentrate is directly fed into a ball mill for grinding without pre-classification and only the coarse particles after concentration are separately fed, and the fine particles are subjected to classification and concentration operations before titanium flotation; or the strong magnetic concentrate is subjected to multiple gravity separations to obtain gravity separation concentrate and gravity separation tailings;

[0023] The coarse particles of the concentrated gravity concentrate are fed into a ball mill and then returned to the flotation process after grinding.

[0024] The strong magnetic tailings and gravity separation tailings are transported to the tailings pond.

[0025] In order to further illustrate the present invention, a method for improving the flotation recovery rate of ilmenite by using vanadium-titanium magnetite provided by the present invention is described in detail below in conjunction with embodiments, but they should not be construed as limiting the scope of protection of the present invention.

[0026] Example 1

[0027] The ilmenite flotation tailings are directly subjected to strong magnetic sweeping (with a strong magnetic field strength of 0.6 Tesla) to obtain a strong magnetic concentrate;

[0028] The strong magnetic concentrate is concentrated and then ball-milled (basically maintaining the original grinding fineness), and then returned to the flotation process after grinding.

[0029] Example 2

[0030] The ilmenite flotation tailings are separated by a primary cyclone to remove the low-grade fine-grained tailings of -45 microns, and then subjected to strong magnetic sweeping (with a strong magnetic field strength of 0.6 Tesla) to obtain a strong magnetic concentrate;

[0031] The strong magnetic concentrate is concentrated to a concentration of 60-70% and then ground (basically maintaining the original grinding fineness), and then returned to the flotation process after grinding.

[0032] The flotation ore (i.e. ilmenite flotation ore) used in the flotation process has a TiO2 grade of 16%. The final titanium concentrate obtained by flotation has a TiO2 grade of 47%. The comprehensive ilmenite flotation tailings have a TiO2 grade of 3.3%. The recovery rate is as high as 85.37%. The concentrate grade meets the requirements, and the unit concentrate collector consumption level is reduced by about 1 kg / ton.

[0033] Example 3

[0034] The ilmenite flotation tailings are separated by a primary cyclone to remove the low-grade fine-grained tailings of -45 microns, and then subjected to strong magnetic sweeping (with a strong magnetic field strength of 0.9 Tesla) to obtain a strong magnetic concentrate;

[0035] The strong magnetic concentrate is subjected to multiple spiral gravity separations (one roughing separation - one fine separation - three scavenging separations). The obtained gravity separation concentrate is concentrated and then ball milled. After grinding, it returns to the flotation process.

[0036] The flotation ore (i.e. ilmenite flotation ore) used in the flotation process has a TiO2 grade of 17%. The final titanium concentrate obtained by flotation has a TiO2 grade of 47%. The comprehensive ilmenite flotation tailings have a TiO2 grade of 3.0%. The recovery rate is as high as 87.97%. The concentrate grade meets the requirements, and the unit concentrate collector consumption level is reduced by about 1.2 kg / ton.

[0037] It can be seen from the above embodiments that the present invention provides a method for improving the flotation recovery rate of ilmenite with vanadium-titanium magnetite, comprising the following steps: directly subjecting the flotation tailings of ilmenite to strong magnetic scavenging, or subjecting the flotation tailings of ilmenite to strong magnetic scavenging after grading and removing the fine-grained tailings to obtain a strong magnetic concentrate; concentrating the strong magnetic concentrate and then ball milling; or subjecting the strong magnetic concentrate to spiral multiple gravity separation, concentrating the obtained gravity separation concentrate and then ball milling, and returning to the flotation process after grinding. The method realizes the high efficiency of the flotation of vanadium-titanium magnetite and ilmenite by crossing flotation with strong magnetic or gravity separation, grinding and other processes, solves the problem of high grade and serious loss of the coarse particle part in the flotation tailings; solves the problem of high reagent consumption, and provides technical support for the flotation of vanadium-titanium magnetite and ilmenite.

[0038] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for improving the flotation recovery rate of ilmenite by using vanadium-titanium magnetite, comprising the following steps: The ilmenite flotation tailings are directly subjected to strong magnetic scavenging, or the ilmenite flotation tailings are graded to remove the fine-grained tailings and then subjected to strong magnetic scavenging to obtain strong magnetic concentrate; The strong magnetic concentrate is concentrated and then ball milled; or the strong magnetic concentrate is subjected to multiple spiral gravity separations, and the obtained gravity separation concentrate is concentrated and then ball milled, and then returned to the flotation process after grinding.

2. The method according to claim 1, characterized in that After removing the -45 micron low-grade fine-grained part, the coarse tailings are subjected to strong magnetic sweeping.

3. The method according to claim 2, characterized in that The ilmenite flotation tailings classification is achieved by removing the low-grade fine particles of -45 microns through 1-2 cyclone classifications.

4. The method according to claim 3, characterized in that The implementation methods include reducing the diameter of the cyclone sand settling port, adjusting the cyclone classification concentration or adjusting the cyclone classification times.

5. The method according to claim 1, characterized in that The TiO2 grade of the ilmenite flotation tailings is 3-7%.

6. The method according to claim 1, characterized in that The magnetic separation field strength of the strong magnetic sweep is 0.5-1.0 Tesla.

Images