CN113941457A - Method for obtaining ultrafine-grained titanium concentrate - Google Patents
Method for obtaining ultrafine-grained titanium concentrate Download PDFInfo
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Abstract
The invention provides a method for obtaining ultrafine-grained titanium concentrate, which comprises the following steps: (1) placing strong magnetic concentrate obtained after the vanadium titano-magnetite is subjected to strong magnetic separation in an inclined thickening box for concentration, then guiding overflow in the inclined thickening box into a cyclone, and performing desliming concentration to obtain cyclone overflow and settled sand; (2) and desulfurizing the settled sand to obtain desulfurized tailings, and sequentially carrying out titanium floatation roughing and titanium floatation fine separation on the desulfurized tailings to obtain ultrafine-grained titanium concentrate. By adopting the process of 'desliming concentration by a cyclone + desulfurization + flotation', the invention can successfully solve the technical bottleneck problem of difficult recovery of the large-volume and low-concentration ultrafine-grained ilmenite, can realize efficient clean utilization of resources, and has the advantages of simple operation, low cost and high titanium recovery rate.
Description
Technical Field
The invention belongs to the technical field of mineral products, and particularly relates to a method for obtaining ultrafine-grained titanium concentrate.
Background
Billions of tons of vanadium-titanium magnetite resources are stored in the Panxi area, and the recovery of the titanium resources in the Panxi area is basically realized by adopting the processes of strong magnetism + flotation and strong magnetism + spiral + strong magnetism + flotation at present, but ilmenite is easy to be crushed under the current ore grinding condition, the-38 mu m fraction ilmenite accounts for more than 30% of the whole Panxi titanium resources statistically, and the part of ilmenite is mainly lost in the links of strong magnetism, concentration and the like in the titanium separation operation. In order to ensure the quality of the titanium concentrate and meet the requirements of the existing titanium floating process, the vanadium titano-magnetite strong magnetic concentrate is concentrated by adopting an inclined concentration box, wherein the overflow has high titanium-containing grade, fine granularity, large volume and low concentration, and the part is generally regarded as slime to be discarded to cause great waste of titanium resources. Therefore, how to recycle the strong magnetic overflow ultrafine-grained ilmenite is the key point for improving the comprehensive utilization rate of titanium resources.
In order to fully realize the recycling of mineral resources, strengthen the efficient separation of target minerals and gangue minerals and break through the technical bottleneck of recycling large-volume and low-concentration ultrafine-grained materials, further research and optimization of related processes are needed.
Disclosure of Invention
The invention aims to solve the technical problems that the defects and shortcomings in the background technology are overcome, the method for obtaining the ultrafine-grained titanium concentrate is provided, the technical bottleneck problem of difficult recovery of large-volume and low-concentration ultrafine-grained ilmenite is successfully solved by adopting a cyclone desliming concentration + desulfurization + flotation process, and meanwhile, the efficient clean utilization of resources can be realized, and the method is simple to operate, low in cost and high in titanium recovery rate.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a method for obtaining ultrafine-fraction titanium concentrate comprises the following steps:
(1) placing strong magnetic concentrate obtained after the vanadium titano-magnetite is subjected to strong magnetic separation in an inclined thickening box for concentration, then guiding overflow in the inclined thickening box into a cyclone, and performing desliming concentration to obtain cyclone overflow and settled sand;
(2) and desulfurizing the settled sand to obtain desulfurized tailings, and sequentially carrying out titanium floatation roughing and titanium floatation fine separation on the desulfurized tailings to obtain ultrafine-grained titanium concentrate.
In the method, the inclined thickening box separates out solid particles in the ore pulp by utilizing the gravity settling effect, and the overflow with low concentration and great volume is produced under the action of turbulent flow at the junction of the settling area, the inflow area and the overflow area, while the swirler is suitable for desliming and concentrating the fine-particle ilmenite with low concentration and great volume, and selectively recovers the fine-particle ilmenite in the overflow of the inclined thickening box, thereby realizing the high-efficiency cooperation of the processes of the inclined thickening box and the swirler.
In the method, in the step (1), the overflow of the inclined thickening box preferably has a mass concentration of 5-10%, a titanium grade of 12-20%, and a particle size of-19 μm of 50-70%.
Preferably, in the step (1), the cyclone is a CZI-100 high-efficiency desliming concentration cyclone (namely a CZI-100 high-efficiency concentration desliming cyclone), the diameter of the cyclone is 50-100 mm, and the feeding pressure is 0.10-0.40 MPa;
the diameter of the sand setting nozzle of the cyclone is 6-16 mm, the diameter of the overflow nozzle is 20-45 mm, and the angle of the cone angle is 5-20 degrees.
Preferably, in the step (2), the desulfurization treatment specifically includes the steps of: and sequentially adding sulfuric acid, butyl xanthate and No. 2 oil into the settled sand, and stirring for 3-8 min respectively.
Preferably, the addition amount of the sulfuric acid is 1500-4500 g/t, the addition amount of the butyl xanthate is 50-150 g/t, and the addition amount of the No. 2 oil is 10-30 g/t.
Preferably, in the step (2), the titanium flotation roughing specifically includes the following steps: and sequentially adding sulfuric acid, a titanium separation collecting agent and diesel oil into the desulfurization tailings, and respectively stirring for 3-8 min.
Preferably, the addition amount of the sulfuric acid is 1000-3000 g/t, the addition amount of the titanium selecting collecting agent is 1500-4000 g/t, and the addition amount of the diesel oil is 300-600 g/t; the titanium separation collecting agent is one or more of MOH-2, RHT-1 and CYT-4, and the mass concentration of the sulfuric acid is 20-30%.
Preferably, in the step (2), the floating titanium concentration specifically includes the following steps: carrying out three times of titanium flotation concentration on the concentrate subjected to titanium flotation roughing in sequence, adding sulfuric acid into the three times of titanium flotation concentration, and stirring for 3-8 min each time of titanium flotation concentration;
the adding amount of the first-time concentration sulfuric acid is 150-350 g/t, the adding amount of the second-time concentration sulfuric acid is 100-250 g/t, the adding amount of the third-time concentration sulfuric acid is 50-150 g/t, and the mass concentration of the sulfuric acid is 20-30%.
Preferably, combining tailings generated by rough flotation of titanium flotation with tailings generated by first flotation and second flotation, then carrying out scavenging of titanium flotation, sequentially adding sulfuric acid and a titanium flotation collecting agent in the scavenging process of titanium flotation, and respectively stirring for 3-8 min; returning the concentrate generated by scavenging the floating titanium to the roughing operation of the floating titanium, and discarding the tailings generated by scavenging the floating titanium.
Preferably, the addition amount of the sulfuric acid is 100-500 g/t, the addition amount of the titanium selecting collecting agent is 0-400 g/t, and the mass concentration of the sulfuric acid is 20% -30%.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the specific gravity difference between the silicate minerals such as the titandiopside, the chlorite, the plagioclase, the amphibole and the like in the gangue minerals and the ilmenite, the sedimentation and the strengthened separation of solid particles in ore pulp are accelerated by the centrifugal force field in the cyclone, and the narrow-range separation of the weak-magnetism silicate minerals and the ilmenite by the strong magnetic separation process is overcome. After the pretreatment of desliming and concentration, the problem of low overflow concentration of the inclined thickening box and the problem of depletion of slime with the thickness of-5 mu m can be effectively solved. And through desliming concentration of the cyclone, most fine mud (such as chlorite, plagioclase and the like which are easy to argillize) is taken away by the obtained overflow, most of slime for deteriorating flotation is reduced, and therefore the flotability of the ultrafine-grained ilmenite is greatly improved.
The invention reduces the phenomena of desalination (concentration reduction) and dilution (concentration grade reduction), optimizes the processes of desulfurization treatment, titanium flotation roughing, titanium flotation refining and the like by strengthening middling treatment, is more beneficial to strengthening effective separation of mud and target minerals in flotation operation, is beneficial to stabilizing the quality of titanium concentrate, and ensures the product quality.
2. The invention adopts an optimized 'desliming concentration + desulfurization + flotation' process of a swirler, and the steps are mutually matched to obtain TiO2The grade of the ultrafine grain grade titanium concentrate is more than 48 percent, the overall recovery rate is high, and the comprehensive utilization rate of titanium resources can be effectively improved.
3. The invention combines the tailings generated by the rough flotation of titanium and the tailings generated by the first and second operations of the fine flotation of titanium to enter the scavenging operation of titanium flotation, and returns the concentrate generated by scavenging titanium flotation to the rough flotation of titanium flotation, thus implementing the mineral separation principle of 'being capable of being lost and lost early'.
In general, the beneficiation method for obtaining the ultrafine-grained ilmenite concentrate from the overflow of the inclined thickening box of the vanadium titano-magnetite strong-magnetic concentrate, provided by the invention, has the characteristics of short process flow, strong adaptability, high recovery rate, good product quality and the like, and realizes the purpose of efficiently recovering the ultrafine-grained ilmenite resource in the overflow product.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a process flow diagram of a method for obtaining ultra-fine fraction titanium concentrate in example 2 of the present invention.
Detailed Description
In order to facilitate understanding of the invention, the invention will be described more fully and in detail with reference to the accompanying drawings and preferred embodiments, but the scope of the invention is not limited to the specific embodiments below.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Unless otherwise specifically stated, various raw materials, reagents, instruments, equipment and the like used in the present invention are commercially available or can be prepared by existing methods.
The separation process of the cyclone is the process of generating, developing and disappearing the fluid vortex. After the ore pulp is injected into the cylinder body from the ore feeding pipe, the whole separation process is rapidly completed under the action of a strong centrifugal force field, overflow products with fine granularity and low density concentration are obtained from the upper overflow pipe, and settled sand products with coarse granularity and high density concentration are obtained from the lower sand settling pipe.
For the particle grade, particularly 5 um-10 um, a special type of small-diameter long cone or small-diameter long cylinder cyclone is suitable for separation under the condition of high pressure and dilute concentration; for fine fraction, particularly 10-74 um, a small-diameter or medium-small-diameter standard cyclone is preferably used for separation under the condition of high pressure (not lower than 0.30MPa) and dilute concentration (5-10%); the coarse fraction, especially 74-250-300 um, is separated by standard cyclone with large or extra large diameter under normal condition (low pressure (not higher than 0.10MPa) and the coarse fraction and large fraction, especially the material with more than 300um, are separated by multi-purpose sieving method.
According to the invention, after the strong magnetic concentrate obtained by the vanadium titano-magnetite after strong magnetic separation is concentrated in the inclined thickening box, the overflow granularity of the inclined thickening box, namely 19 microns, accounts for 50-70%. The invention realizes desliming concentration by adopting the synergistic action of the inclined thickening box and the high-efficiency desliming concentration cyclone.
Example 1:
the inclined thickening box and the CZI-100 high-efficiency desliming concentration cyclone (namely the CZI-100 high-efficiency concentration desliming cyclone) are selected to act synergistically. When the CZI-100 high-efficiency desliming concentration cyclone is used, under the conditions that the feeding concentration is 6.45% and the feeding pressure is 0.30Mpa, the optimal structural parameter conditions of the CZI-100 high-efficiency desliming concentration cyclone are as follows:the diameter of the cyclone is 100mm, the diameter of the sand settling nozzle is 8mm, the insertion depth of the overflow pipe is 200mm, the diameter of the overflow pipe is 32mm, and the angle of the cone angle is 5 degrees. For 300m2And (3) performing desliming concentration on the product by inclining the overflow of the thickening box to stabilize a production test sample, throwing the overflow and intercepting settled sand, wherein the stable production test index is shown in table 1.
Watch 1300 m2Test index results of inclined plate overflow desliming concentration stabilization production%
The test results show that for 300m2The overflow concentration of the inclined thickening box is 6.45 percent, and desliming and concentration are carried out through a CZI-100 high-efficiency desliming and concentration cyclone. The concentration of settled sand is up to 43.50%, the yield is 80.19%, TiO2The grade is 20.01 percent, the recovery rate is 86.47 percent, the operation achieves the functions of desliming, concentration and pre-enrichment, and TiO in the thrown overflow2The grade is reduced to 12.68 percent.
The stable production further verifies that the CZI-100 high-efficiency desliming concentration cyclone is suitable for desliming concentration of ultrafine grained ilmenite with low concentration and large volume quantity. In order to further illustrate the desliming effect of the CZI-100 high-efficiency desliming concentration cyclone, the granularity composition analysis is carried out on the settled sand products produced stably, and the screening results are respectively shown in tables 2 and 3.
TABLE 2 results of size analysis of sand-settling products of desliming concentrated samples%
TABLE 3 cyclone overflow (slime) size analysis results%
As shown by the data in tables 1, 2 and 3, the-0.005 mm fraction content of the settled sand after desliming and concentration by the desliming cyclone is reduced to 0.76 percent, while the-0.005 mm fraction content of the settled sand in the overflow (slime) of the cyclone is as high as 66.72 percent, and the TiO fraction is TiO fraction2The distribution rate is also as high as 65.20%, which shows that the desliming and concentrating effects are obvious.
To further illustrate the different properties between desliming cyclone sand settling and slime production, phase and mineral composition analyses were compared and the results are shown in table 4.
TABLE 4 chemical phase analysis results of titanium desliming concentrate%
As can be seen from the analysis in Table 4, TiO in ilmenite in desliming and sand setting2The content is higher than that of the slime, which indicates that the titanium and molybdenum of the product are enriched. Therefore, the purposes of concentration desliming and particle size optimization can be achieved after the desliming cyclone, a foundation is laid for recovering ilmenite through flotation in the next step, and the principle and the technical effect are further verified.
Adopts a CZI-100 type high-efficiency desliming concentration cyclone pair with the diameter of 600m2The sloping plate overflow sample is subjected to desliming test and is produced into a test sample with the thickness of 600m2The swash plate overflow sample concentration was 5.03% and the test results are shown in table 5.
Table 5600M2Test results of desliming concentration of overflow sample cyclone%
The experimental research result shows that the CZI high-efficiency concentration desliming cyclone developed by the Changsha mining and metallurgy institute is adopted. By CZI-After desliming is carried out by the 100 type high-efficiency concentration desliming cyclone, the concentration of settled sand is as high as 62.47 percent and TiO is2The grade is 20.04%, the recovery rate is 84.81%, the sand setting of the cyclone has a certain enrichment function, and TiO in the overflow is2The grade is reduced to 9.35 percent.
Experiments further prove that the CZI-100 type high-efficiency concentration desliming cyclone is suitable for concentration and desliming of the fine-particle ilmenite with low concentration and large volume amount.
300m2The titanium flotation contrast test results of different desliming processes of the sloping plate overflow sample are as follows:
due to 300m2The-0.019 mm size fraction in the inclined plate overflow sample reached 50.67%, with a-0.005 mm slime content of about 30%, which had an extremely adverse effect on flotation, and therefore flotation was optimized considering that most of the slime was removed before flotation. The test adopts three modes of natural settling desliming, flocculation concentration and strong magnetic desliming and cyclone to carry out desliming-flotation respectively, and the test results are shown in table 6.
TABLE 6 results of flotation tests in different desliming processes%
As can be seen from the test data in Table 6, the coarse and fine products directly float without desliming have low level and the selection effect and the selection index are the worst; the settled sand obtained by three different desliming modes is floated, the result of the cyclone concentrated desliming process is optimal, and the recovery rate is up to more than 80% under the condition of ensuring the grade of coarse and fine products. Therefore, the new process of concentration desliming-flotation by adopting the cyclone can effectively recover the fine-grained ilmenite.
Example 2:
a method for obtaining ultrafine fraction titanium concentrate, a process flow chart is shown in figure 1, and the method comprises the following steps:
(1) passing a certain vanadium titano-magnetite in Panxi areaPlacing the two-stage strong magnetic concentrate obtained after strong magnetic separation in a position of 300m2Concentrating in the inclined thickening box, guiding the overflow in the inclined thickening box into a CZI-100 high-efficiency desliming concentration cyclone through a pump for desliming concentration, and obtaining cyclone overflow and settled sand. Wherein, the concentration of the overflow of the inclined concentration box of the strong magnetic concentrate is 5.03 percent, the titanium grade is 18.44 percent, the granularity of 19 microns is 57.09 percent, the diameter of the swirler is 100mm, and the feeding pressure is 0.35 MPa; the diameter of a sand setting nozzle of the cyclone is 8mm, the insertion depth of the overflow pipe is 200mm, the diameter of the overflow pipe is 32mm, and the angle of the cone angle is 5 degrees.
The yield of overflow (waste disposal) generated by desliming and concentrating operation is 18.15%, the titanium grade is 12.43%, and the titanium loss rate is 12.23%.
(2) And sequentially adding sulfuric acid, butyl xanthate and No. 2 oil into the deslimed and concentrated settled sand, and stirring for 5min respectively for desulfurization to obtain desulfurization tailings and coarse sulfur concentrate. Wherein, the addition amount of the sulfuric acid is 3000g/t, the addition amount of the butyl xanthate is 100g/t, and the addition amount of the No. 2 oil is 20 g/t.
(3) And carrying out titanium flotation roughing on the desulfurized tailings subjected to the desulfurization flotation, sequentially adding sulfuric acid, MOH-2 and diesel oil during the titanium flotation roughing, and respectively stirring for 5 min. Wherein the addition amount of the sulfuric acid is 1500g/t, the addition amount of the MOH-2 is 3000g/t, and the addition amount of the diesel oil is 450 g/t.
(4) And carrying out three times of floating titanium concentration on the concentrate subjected to the floating titanium rough concentration.
Wherein, sulfuric acid is added and stirred for 5min for the first selection, and the adding amount of the sulfuric acid is 250 g/t;
selecting for the second time, adding sulfuric acid, and stirring for 5min, wherein the addition amount of the sulfuric acid is 100 g/t;
selecting for the third time, adding sulfuric acid, stirring for 5min, wherein the adding amount of the sulfuric acid is 100g/t, and obtaining TiO2The grade of the ultrafine-grained titanium concentrate is 48.41 percent (wherein the S content is 0.07 percent), the content of the ultrafine-grained titanium concentrate is (-38um accounts for 98.23 percent, wherein-19 um accounts for 65.38 percent), and the recovery rate reaches 69.70 percent.
(5) And (4) combining the tailings generated in the titanium flotation roughing in the step (3) and the tailings generated in the first fine concentration and the second fine concentration in the step (4) to carry out titanium flotation scavenging operation, sequentially adding sulfuric acid and MOH-2 in the titanium flotation scavenging process, and respectively stirring for 5 min. Wherein the addition amount of the sulfuric acid is 200g/t, and the addition amount of the MOH-2 is 200 g/t.
And (4) returning the concentrate generated by titanium flotation scavenging to the step (4) and putting the concentrate into titanium flotation roughing operation, and discarding tailings generated by titanium flotation scavenging.
In example 2, the mass concentration of sulfuric acid was 25%.
Example 3:
a method for obtaining ultrafine-fraction titanium concentrate comprises the following steps:
(1) placing a second-stage strong magnetic concentrate obtained by strongly magnetic separating certain vanadium-titanium magnetite in Panxi area at 600m2Concentrating in the inclined thickening box, guiding the overflow in the inclined thickening box into a CZI-100 high-efficiency desliming concentration cyclone through a pump for desliming concentration, and obtaining cyclone overflow and settled sand. Wherein the concentration of the overflow of the inclined concentration box of the strong magnetic concentrate is 5.11 percent, the titanium grade is 17.27 percent, the granularity of 19 mu m accounts for 64.62 percent, the diameter of the cyclone is 100mm, and the feeding pressure is 0.38 MPa; the diameter of a sand setting nozzle of the cyclone is 6mm, the insertion depth of the overflow pipe is 200mm, the diameter of the overflow pipe is 24mm, and the angle of the cone angle is 5 degrees.
The yield of overflow (waste disposal) generated by desliming and concentrating operation is 28.47 percent, and the yield of TiO is2The grade was 10.35%, and the titanium loss was 17.06%.
(2) And sequentially adding sulfuric acid, butyl xanthate and No. 2 oil into the desilting and concentrated settled sand, and stirring for 5min respectively for desulfurization to obtain desulfurization tailings and coarse sulfur concentrate. Wherein, the addition amount of the sulfuric acid is 3000g/t, the addition amount of the butyl xanthate is 100g/t, and the addition amount of the No. 2 oil is 20 g/t.
(3) And carrying out titanium flotation roughing on the desulfurized tailings subjected to the desulfurization flotation, sequentially adding sulfuric acid, MOH-2 and diesel oil during the titanium flotation roughing, and respectively stirring for 5 min. Wherein the addition amount of the sulfuric acid is 1500g/t, the addition amount of the MOH-2 is 3000g/t, and the addition amount of the diesel oil is 450 g/t.
(4) And carrying out three times of floating titanium concentration on the concentrate subjected to the floating titanium rough concentration.
Wherein, sulfuric acid is added and stirred for 5min for the first selection, and the adding amount of the sulfuric acid is 250 g/t;
selecting for the second time, adding sulfuric acid, and stirring for 5min, wherein the addition amount of the sulfuric acid is 100 g/t;
selecting for the third time, adding sulfuric acid, stirring for 5min, wherein the adding amount of the sulfuric acid is 100g/t, and obtaining TiO2The grade of the ultrafine-grained titanium concentrate is 49.45 percent, the content of (-38um accounts for 96.85 percent, the content of-19 um accounts for 59.56 percent), and the recovery rate reaches 70.12 percent.
(5) And (3) combining the tailings generated in the titanium flotation roughing in the step (4) and the tailings generated in the first fine concentration and the second fine concentration in the step (4) to carry out titanium flotation scavenging operation, sequentially adding sulfuric acid and MOH-2 in the titanium flotation scavenging process, and respectively stirring for 5 min. Wherein the addition amount of the sulfuric acid is 200g/t, and the addition amount of the MOH-2 is 200 g/t.
And (4) returning the concentrate generated by titanium flotation scavenging to the step (4) and putting the concentrate into titanium flotation roughing operation, and discarding tailings generated by titanium flotation scavenging.
In example 3, the mass concentration of sulfuric acid was 25%.
Comparative example 1:
a method for obtaining ultrafine-fraction titanium concentrate comprises the following steps:
(1) placing two-stage strong magnetic concentrate obtained by strong magnetic separation of certain vanadium-titanium magnetite in Panxi area at 300m2Concentrating in the inclined thickening box, guiding the overflow in the inclined thickening box into a CZI-100 high-efficiency desliming concentration cyclone through a pump for desliming concentration, and obtaining cyclone overflow and settled sand. Wherein, the concentration of the overflow of the inclined concentration box of the strong magnetic concentrate is 5.03 percent, the titanium grade is 18.44 percent, the granularity of 19 microns is 57.09 percent, the diameter of the swirler is 100mm, and the feeding pressure is 0.35 MPa; the diameter of a sand setting nozzle of the cyclone is 8mm, the insertion depth of the overflow pipe is 200mm, the diameter of the overflow pipe is 32mm, and the angle of the cone angle is 5 degrees.
The yield of overflow (waste disposal) generated by desliming and concentrating operation is 18.15%, the titanium grade is 12.43%, and the titanium loss rate is 12.23%.
(2) Directly carrying out titanium floatation roughing without desulphurization in the deslimed and concentrated settled sand, sequentially adding sulfuric acid, MOH-2 and diesel oil during titanium floatation roughing, and respectively stirring for 5 min. Wherein, the addition amount of the sulfuric acid is 4500g/t, the addition amount of the MOH-2 is 3000g/t, and the addition amount of the diesel oil is 450 g/t.
(3) And carrying out three times of floating titanium concentration on the concentrate subjected to the floating titanium rough concentration.
Wherein, sulfuric acid is added and stirred for 5min for the first selection, and the adding amount of the sulfuric acid is 250 g/t;
selecting for the second time, adding sulfuric acid, and stirring for 5min, wherein the addition amount of the sulfuric acid is 100 g/t;
selecting for the third time, adding sulfuric acid, stirring for 5min, wherein the adding amount of the sulfuric acid is 100g/t, and obtaining TiO2The grade of the ultrafine-grained titanium concentrate is 41.82 percent (the S content is 0.543 percent), the quality of the ultrafine-grained titanium concentrate is unqualified, the S content exceeds the standard, and the recovery rate is 73.45 percent.
(4) And (3) carrying out titanium flotation scavenging operation on the tailings generated in the titanium flotation roughing in the step (2), sequentially adding sulfuric acid and MOH-2 in the titanium flotation scavenging process, and respectively stirring for 5 min. Wherein the addition amount of the sulfuric acid is 200g/t, and the addition amount of the MOH-2 is 200 g/t.
(5) And (4) returning the concentrate generated by titanium flotation scavenging to the first concentration operation in the step (4) and the step (3) in sequence, and discarding tailings generated by titanium flotation scavenging. And (4) returning tailings generated in the second concentration and the third concentration in the step (3) to the previous operation in sequence.
In comparative example 1, the mass concentration of sulfuric acid was 25%.
Claims (10)
1. A method for obtaining ultrafine-grained titanium concentrate is characterized by comprising the following steps:
(1) placing strong magnetic concentrate obtained after the vanadium titano-magnetite is subjected to strong magnetic separation in an inclined thickening box for concentration, then guiding overflow in the inclined thickening box into a cyclone, and performing desliming concentration to obtain cyclone overflow and settled sand;
(2) and desulfurizing the settled sand to obtain desulfurized tailings, and sequentially carrying out titanium floatation roughing and titanium floatation fine separation on the desulfurized tailings to obtain ultrafine-grained titanium concentrate.
2. The method for obtaining the ultrafine fraction titanium concentrate according to the claim 1, wherein in the step (1), the mass concentration of the overflow of the inclined thickening box is 5-10%, the titanium grade is 12-20%, and the granularity of-19 μm is 50-70%.
3. The method for obtaining ultrafine fraction titanium concentrate according to claim 1, wherein in the step (1), the diameter of the cyclone is 50-100 mm, and the feeding pressure is 0.10-0.40 MPa;
the diameter of the sand setting nozzle of the cyclone is 6-16 mm, the diameter of the overflow nozzle is 20-45 mm, and the angle of the cone angle is 5-20 degrees.
4. The method for obtaining ultrafine grained titanium concentrate according to any one of claims 1 to 3, characterized in that in step (2), the desulfurization treatment specifically comprises the following steps: and sequentially adding sulfuric acid, butyl xanthate and No. 2 oil into the settled sand, and stirring for 3-8 min respectively.
5. The method for obtaining the ultrafine fraction titanium concentrate according to claim 4, wherein the addition amount of the sulfuric acid is 1500-4500 g/t, the addition amount of the butyl xanthate is 50-150 g/t, and the addition amount of the No. 2 oil is 10-30 g/t.
6. The method for obtaining ultrafine grained titanium concentrate according to any one of claims 1 to 3, characterized in that in step (2), the floating titanium roughing specifically comprises the following steps: and sequentially adding sulfuric acid, a titanium separation collecting agent and diesel oil into the desulfurization tailings, and respectively stirring for 3-8 min.
7. The method for obtaining the ultrafine grained titanium concentrate according to claim 6, wherein the addition amount of sulfuric acid is 1000-3000 g/t, the addition amount of a titanium separation collector is 1500-4000 g/t, and the addition amount of diesel oil is 300-600 g/t; the titanium separation collecting agent is one or more of MOH-2, RHT-1 and CYT-4, and the mass concentration of the sulfuric acid is 20-30%.
8. The method for obtaining ultrafine grained titanium concentrate according to any one of claims 1 to 3, characterized in that in step (2), the floating titanium concentration specifically comprises the following steps: carrying out three times of titanium flotation concentration on the concentrate subjected to titanium flotation roughing in sequence, adding sulfuric acid into the three times of titanium flotation concentration, and stirring for 3-8 min each time of titanium flotation concentration;
the adding amount of the first-time concentration sulfuric acid is 150-350 g/t, the adding amount of the second-time concentration sulfuric acid is 100-250 g/t, the adding amount of the third-time concentration sulfuric acid is 50-150 g/t, and the mass concentration of the sulfuric acid is 20-30%.
9. The method for obtaining ultrafine grained titanium concentrate according to claim 8, characterized by further comprising the steps of: combining tailings generated by titanium flotation roughing and tailings generated by first concentration and second concentration, then carrying out titanium flotation scavenging, sequentially adding sulfuric acid and a titanium flotation collecting agent in the titanium flotation scavenging process, and respectively stirring for 3-8 min; returning the concentrate generated by scavenging the floating titanium to the roughing operation of the floating titanium, and discarding the tailings generated by scavenging the floating titanium.
10. The method for obtaining the ultrafine grained titanium concentrate according to claim 9, wherein the addition amount of the sulfuric acid is 100-500 g/t, the addition amount of the titanium separation collecting agent is 0-400 g/t, and the mass concentration of the sulfuric acid is 20-30%.
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