阅读说明：本技术 一种从钒钛磁铁矿选钛尾矿中回收钛的方法 (Method for recovering titanium from titanium-selecting tailings of vanadium titano-magnetite ) 是由 吴宁 于 2020-11-17 设计创作，主要内容包括：本发明公开了一种从钒钛磁铁矿选钛尾矿中回收钛的方法,将选钛尾矿调成矿浆后筛分,筛下产品分级为第一沉砂和第一溢流；将第一沉砂磨矿后二次分级为第二沉砂和第二溢流；将第二溢流进行第一弱磁选得到第一次铁精矿和第一磁选尾矿；将第一磁选尾矿经过磁选选别,得到第二尾矿和第二磁选精矿；将第一溢流进行第二弱磁选,得到第二次铁精矿和第二磁选尾矿；将第二磁选尾矿磁选选别,得到第三尾矿和第一磁选精矿；将第一磁选精矿和第二磁选精矿磨矿后弱磁选,得到第三次铁精矿和第三磁选尾矿；将第三磁选尾矿磁选选别,得到初级钛精矿和第四尾矿；将初级钛精矿进行浮选和扫选,得到最终精矿。解决了现有工艺中微细级钛铁矿难以回收的问题。(The invention discloses a method for recovering titanium from titanium-selecting tailings of vanadium titano-magnetite, which comprises the steps of mixing the titanium-selecting tailings into ore pulp, screening, and grading screened products into first settled sand and first overflow; performing secondary classification on the ground first settled sand into second settled sand and second overflow; carrying out first low-intensity magnetic separation on the second overflow to obtain first iron ore concentrate and first magnetic tailings; carrying out magnetic separation on the first magnetic separation tailings to obtain second tailings and second magnetic separation concentrates; carrying out second low-intensity magnetic separation on the first overflow to obtain second iron ore concentrate and second magnetic tailings; carrying out magnetic separation on the second magnetic separation tailings to obtain third tailings and first magnetic separation concentrates; grinding the first magnetic concentrate and the second magnetic concentrate, and then carrying out low intensity magnetic separation to obtain a third iron concentrate and a third magnetic tailings; carrying out magnetic separation on the third magnetic separation tailings to obtain primary titanium concentrate and fourth tailings; and carrying out flotation and scavenging on the primary titanium concentrate to obtain the final concentrate. Solves the problem that the fine ilmenite is difficult to recover in the prior art.)

1. A method for recovering titanium from titanium tailings of vanadium titano-magnetite is characterized by comprising the following steps:

step 1, modulating titanium-selecting tailings into ore pulp, and then screening to obtain oversize products serving as first tailings;

step 2, feeding the undersize product into a first-stage hydrocyclone for classification to obtain first settled sand and first overflow;

step 3, feeding the ground first settled sand into a secondary hydrocyclone for classification to obtain second settled sand and second overflow; carrying out first low-intensity magnetic separation on the second overflow to obtain first iron ore concentrate and first magnetic separation tailings; sorting the first magnetic separation tailings by a pulsating high-gradient magnetic separator to obtain second tailings and second magnetic separation concentrates;

carrying out second low-intensity magnetic separation on the first overflow to obtain second iron ore concentrate and second magnetic tailings; sorting the second magnetic separation tailings through first superconducting magnetic separation to obtain third tailings and first magnetic separation concentrates;

step 4, feeding the first magnetic concentrate and the second magnetic concentrate into a pizza grinder for grinding, and then carrying out third low-intensity magnetic separation to obtain third iron concentrate and third magnetic tailings;

step 5, feeding the third magnetic separation tailings into a second superconducting magnetic separation for separation to obtain primary titanium concentrate and fourth tailings;

and 6, carrying out flotation and scavenging on the primary titanium concentrate to obtain final concentrate.

2. The method of claim 1, wherein subjecting the primary titanium concentrate to flotation comprises:

and 61, performing rough flotation on the primary titanium concentrate to obtain rough concentrate and rough tailings, and performing fine flotation on the rough concentrate to obtain final concentrate and fine tailings.

3. The method of claim 2, wherein subjecting the primary titanium concentrate to flotation further comprises:

step 62, scavenging and floating the rougher tailings to obtain scavenged concentrate and fifth tailings;

step 63 returns the scavenger concentrate and the concentration tailings to rougher flotation, repeating steps 61 to 62.

4. The method according to claim 1, characterized in that in step 1, the pulp concentration is 20-50% in terms of percent of solid content; the screening is carried out by a slag separating screen with the screen hole diameter of 0.8-1.5.

5. The method according to claim 1, characterized in that in step 3 the second sand sediment is returned to be ground together with the first sand sediment.

6. The method of claim 1, wherein the hydrocyclone controlled classification particle size is overflow-0.038 mm content of greater than 80%, and the secondary hydrocyclone controlled classification particle size is overflow-0.074 mm content of greater than 70%.

7. The method as claimed in claim 1, wherein the magnetic field strength of the first, second and third low-intensity magnetic separation is 2000-4000 Oe.

8. The method as claimed in claim 2 or 3, wherein the flotation is performed by using a jet flow flotation machine as the flotation equipment, sulfuric acid as the pH regulator, pH value of 3-4.5, sodium hexametaphosphate as the dispersant, the total amount of which is 100-200g/t, MOH as the collector, the total amount of which is 1000-2000g/t, and 2# oil as the foaming agent, the total amount of which is 60-80 g/t.

9. The method as claimed in claim 1, wherein the magnetic field strength of the first superconducting magnetic separation and the second superconducting magnetic separation is 15000-32000 Oe.

10. The method as claimed in claim 1, wherein the magnetic field strength of the pulsed high gradient magnetic separation is 6000-.

Technical Field

The invention relates to the technical field of mineral processing, in particular to a method for recovering titanium from vanadium titano-magnetite titanium-selecting tailings.

Background

Titanium is an important metal resource, has the characteristics of light weight, high strength, acid and alkali resistance and corrosion resistance, and is widely applied to the fields of high-speed rails, aerospace, navigation, coatings and the like.

The reserve of titanium resources in the Panxi area of China is about one third of the reserve of titanium resources in China, and the Panxi area is the base for developing and utilizing the important titanium resources in China. The Panxi titanium resource mainly exists in the form of titanomagnetite and ilmenite, and the current main recovery mode for recovering the titanium resource is as follows: recovering the titanomagnetite by a magnetic separation process of step grinding and step separation; and recovering ilmenite in the iron tailings through a strong magnetic-flotation process. The existing titanium resource recovery mode causes a large amount of fine-particle ilmenite to be generated in the sorting process and to be lost in tailings in the forms of slime, overflow and the like, and meanwhile, part of ilmenite is lost in tailings in the form of coarse-particle intergrowth, so that a large amount of titanium resource loss is caused.

At present, the main methods for recovering titanium resources in the titanium tailings of the vanadium titano-magnetite separation comprise 'strong magnetism-classification grinding-strong magnetism-flotation', 'strong magnetism-grinding-strong magnetism-table concentrator', but because the existing magnetic separation, gravity separation and other processes are difficult to effectively recover the fine-particle ilmenite, ideal beneficiation indexes are difficult to obtain.

Therefore, a process capable of recovering titanium from the tailings of the vanadium titano-magnetite and improving the utilization rate of titanium in the vanadium titano-magnetite in the Panxi area is needed.

Based on this, the prior art still remains to be improved.

Disclosure of Invention

In order to solve the technical problems, the embodiment of the invention provides a method for recovering titanium from titanium tailings of vanadium titano-magnetite so as to solve the problems that fine-particle ilmenite is difficult to effectively recover and ideal beneficiation indexes are difficult to obtain in the processes of magnetic separation, gravity separation and the like in the prior art.

The embodiment of the invention discloses a method for recovering titanium from vanadium titano-magnetite titanium-selecting tailings, which comprises the following steps:

step 1, modulating titanium-selecting tailings into ore pulp, and then screening to obtain oversize products serving as first tailings;

step 2, feeding the undersize product into a first-stage hydrocyclone for classification to obtain first settled sand and first overflow;

step 3, feeding the ground first settled sand into a secondary hydrocyclone for classification to obtain second settled sand and second overflow; carrying out first low-intensity magnetic separation on the second overflow to obtain first iron ore concentrate and first magnetic separation tailings; sorting the first magnetic separation tailings by a pulsating high-gradient magnetic separator to obtain second tailings and second magnetic separation concentrates;

carrying out second low-intensity magnetic separation on the first overflow to obtain second iron ore concentrate and second magnetic tailings; sorting the second magnetic separation tailings through first superconducting magnetic separation to obtain third tailings and first magnetic separation concentrates;

step 4, feeding the first magnetic concentrate and the second magnetic concentrate into a pizza grinder for grinding, and then carrying out third low-intensity magnetic separation to obtain third iron concentrate and third magnetic tailings;

step 5, feeding the third magnetic separation tailings into a second superconducting magnetic separation for separation to obtain primary titanium concentrate and fourth tailings;

and 6, carrying out flotation and scavenging on the primary titanium concentrate to obtain final concentrate.

Further, subjecting the primary titanium concentrate to flotation comprises:

and 61, performing rough flotation on the primary titanium concentrate to obtain rough concentrate and rough tailings, and performing fine flotation on the rough concentrate to obtain final concentrate and fine tailings.

Further, subjecting the primary titanium concentrate to flotation further comprises:

step 62, scavenging and floating the rougher tailings to obtain scavenged concentrate and fifth tailings;

step 63 returns the scavenger concentrate and the concentration tailings to rougher flotation, repeating steps 61 to 62.

Further, in the step 1, the concentration of the ore pulp is 20-50% in terms of solid content percentage; the screening is carried out by a slag separating screen with the screen hole diameter of 0.8-1.5; too high or too low a pulp concentration can result in low screening efficiency.

Further, in step 3, the second settled sand is returned to grind together with the first settled sand.

Furthermore, the classification granularity of the hydrocyclone is controlled to be that the overflow content of-0.038 mm is more than 80%, and the classification granularity of the second hydrocyclone is controlled to be that the overflow content of-0.074 mm is more than 70%.

Further, the magnetic field intensity of the first low-intensity magnetic separation, the second low-intensity magnetic separation and the third low-intensity magnetic separation is 2000-4000 Oe.

In some embodiments, the magnetic field intensity of the first low-intensity magnetic separation and the second low-intensity magnetic separation are the same and are lower than that of the third low-intensity magnetic separation, so that the arrangement can maintain a higher magnet grade and the effect of removing strong magnetic minerals, and prevent the blockage of the superconducting magnetic separator.

Further, the flotation adopts a jet flow flotation machine as flotation equipment, sulfuric acid as a pH regulator, pH value of 3-4.5 and sodium hexametaphosphate as a dispersing agent, the total dosage of the sodium hexametaphosphate is 200g/t (the dosage used by each ton of primary titanium concentrate), MOH as a collecting agent is 1000-2000g/t, 2# oil (pine oil) as a foaming agent is 60-80 g/t. The use level of sodium hexametaphosphate is too low, which can cause the obtained TiO concentrate₂Low grade and high dosage, which may result in TiO concentrate₂Low grade and TiO₂The recovery rate is reduced; too low an MOH content will result in TiO concentrates₂The recovery rate is reduced, and the use amount is too high, which can cause titanium concentrate TiO₂The grade is reduced. Too low foaming agent can result in less separation, reduced titanium concentrate yield and titanium concentrate TiO₂The recovery rate is reduced, and the foaming agent is too high, so that the grade of the titanium concentrate TiO2 is reduced.

Further, the magnetic field intensity of the first superconducting magnetic separation and the second superconducting magnetic separation is 15000 and 32000 Oe.

Further, the magnetic field intensity of the pulsed high-gradient magnetic separation is 6000-. The low magnetic field intensity can cause the low yield of the titanium concentrate, and the TiO in the titanium concentrate₂The recovery rate is reduced, and overhigh recovery rate can lead to titanium concentrate TiO₂The grade of (2) is reduced.

By adopting the technical scheme, the invention at least has the following beneficial effects:

(1) the invention recovers ilmenite which is difficult to recover at present from tailings of the vanadium titano-magnetite, obtains the final titanium concentrate with the grade of about 47 percent, has the recovery rate of more than 42 percent, and improves the utilization rate of titanium resources in the vanadium titano-magnetite.

(2) Compared with the prior art, the invention realizes wide-size-fraction selection, the selected granularity can reach 0-2mm, and the invention has strong adaptability to the tailing selection granularity.

(3) The invention solves the problem that the fine ilmenite is difficult to recover in the prior art, and can effectively recover the-20 mu m ilmenite in the fine grade.

Drawings

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 described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

Fig. 1 is a flow chart of a method for recovering titanium from vanadium titano-magnetite titanium tailings according to an embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments of the present invention are described in further detail with reference to the accompanying drawings.

It should be noted that all expressions using "first" and "second" in the embodiments of the present invention are used for distinguishing two entities with the same name but different names or different parameters, and it should be noted that "first" and "second" are merely for convenience of description and should not be construed as limitations of the embodiments of the present invention, and they are not described in any more detail in the following embodiments.

As shown in fig. 1, some embodiments of the present invention disclose a method for recovering titanium from vanadium titano-magnetite titanium tailings, which can achieve better enrichment and recovery of titanium in the vanadium titano-magnetite titanium tailings, and has the characteristics of good comprehensive recovery effect of ilmenite and high titanium recovery rate. The method comprises the following specific steps:

(1) feeding the titanium-selecting tailings into an ore pulp stirring barrel to prepare ore pulp with the ore pulp concentration of 25-50%, feeding the ore pulp into a slag separation sieve with the sieve pore diameter of 0.8-1.5mm for sieving, and controlling the sieving granularity to be 1.0 mm;

(2) directly discarding the screened products in the step (1), wherein the screened products are tailings I (first tailings);

(3) feeding the undersize product obtained in the step (1) into a first-stage hydrocyclone, and controlling the classification granularity to be 0.038 mm;

(4) feeding the settled sand (the part with the granularity larger than 0.038 mm) of the hydrocyclone in the step (3) into a ball mill for grinding;

(5) feeding the ground ore product obtained in the step (4) into a secondary hydrocyclone for classification; returning settled sand generated by the secondary hydrocyclone to the ball mill to form closed circuit grinding ore;

(6) feeding overflow generated by the secondary hydrocyclone in the step (5) into a low-intensity magnetic separation I (first low-intensity magnetic separation), and taking magnetic separation concentrate as a secondary iron concentrate I (first iron concentrate);

(7) feeding the magnetic tailings generated in the step (6) into a pulsating high-gradient magnetic separator for separation, wherein the tailings are used as tailings II (second tailings);

(8) feeding the overflow generated by the hydrocyclone in the step (3) into a drum type downstream low-intensity magnetic separation II (second low-intensity magnetic separation), and taking the magnetic separation concentrate as a secondary iron concentrate II (second iron concentrate);

(9) feeding the magnetic separation tailings generated in the step (8) into a superconducting magnetic separation I (first superconducting magnetic separation) for separation, wherein the tailings are used as tailings III (third tailings);

(10) and (3) feeding the magnetic concentrate produced in the steps (9) and (7) into an Isa mill for ore grinding, feeding the ore grinding product into a drum-type downstream low-intensity magnetic separation III (third low-intensity magnetic separation), and taking the magnetic concentrate as a secondary iron concentrate III (third iron concentrate).

(11) And (3) feeding the magnetic separation tailings generated in the step (10) into a superconducting magnetic separation II (second superconducting magnetic separation) for separation, wherein the obtained concentrate is primary titanium concentrate, and the tailings are used as tailings IV (fourth tailings).

(12) Feeding the primary titanium concentrate into a roughing jet flotation machine for flotation, feeding the obtained roughing concentrate into a fine flotation jet flotation machine for fine concentration, feeding the obtained roughing tailings into a scavenging jet flotation machine for scavenging, returning the obtained scavenging concentrate and the fine tailings to roughing, and obtaining the concentrate as final concentrate by fine concentration and the scavenging tailings as tailings V (fifth tailings).

(13) And combining the tailings I, II, III, IV and V to obtain total tailings, and combining the secondary iron ore concentrates I, II and III to obtain the total secondary iron ore concentrate.

In the embodiment, the classification granularity of the first-stage cyclone is controlled to be that the overflow-0.038 mm content is more than 80%, the classification granularity of the second-stage cyclone is controlled to be that the overflow-0.074 mm content is more than 70%, the background magnetic field intensity of the low-intensity magnetic separation I, II and III is 2000-.

The flotation process adopts a jet flow flotation machine as flotation equipment, adopts sulfuric acid as a pH regulator, has a pH value of 3-4.5, adopts sodium hexametaphosphate as a dispersing agent, has a total dosage of 100-2000 g/t, adopts MOH as a collecting agent, has a total dosage of 1000-2000g/t, and adopts 2# oil as a foaming agent, and has a total dosage of 60-80 g/t.

Example 1:

in this example, the tailings of a titanium separation plant of Panzhihua were selected, and as shown in Table 1, the TFe grade in the tailings was 12.5%, and TiO content was 12.5%₂The grade was 6.14%.

TABLE 1 analysis of chemical composition of Panzhihua tailings of titanium separation plant

The method specifically comprises the following steps:

(1) feeding the tailings into an ore pulp stirring barrel, adjusting the ore pulp into ore pulp with the ore pulp concentration of 25-50%, feeding the ore pulp into a slag separation sieve with the sieve pore diameter of 0.8-1.5mm, and screening, wherein the screening granularity is controlled to be 1.0 mm;

(2) directly discarding the screened products in the step (1), wherein the screened products are tailings I;

(3) feeding the undersize product obtained in the step (1) into a first-stage hydrocyclone, and controlling the classification granularity to be 0.038 mm;

(4) feeding the settled sand (the part with the granularity larger than 0.038 mm) of the hydrocyclone in the step (3) into a ball mill for grinding;

(5) feeding the ore grinding product obtained in the step (4) into a secondary hydrocyclone for classification, wherein the overflow classification granularity of the hydrocyclone is controlled to be 75% in the range of-0.074 mm; returning settled sand generated by the secondary hydrocyclone to the ball mill to form closed circuit grinding ore;

(6) and (5) feeding overflow generated by the secondary hydrocyclone in the step (5) into a low-intensity magnetic separation I, wherein the magnetic field intensity is 2200Oe, and the magnetic separation concentrate is used as a secondary iron concentrate I.

(7) And (4) feeding the magnetic separation tailings generated in the step (6) into a pulsating high-gradient magnetic separator for separation, controlling the magnetic field intensity to be 6000Oe, and taking the tailings as tailings II.

(8) And (4) feeding the overflow generated by the hydrocyclone in the step (3) into a drum type downstream low-intensity magnetic separation II, wherein the magnetic field intensity is 2500Oe, and the magnetic separation concentrate is used as a secondary iron concentrate II.

(9) And (4) feeding the magnetic separation tailings generated in the step (8) into a superconducting magnetic separation I for separation, controlling the magnetic field intensity to be 28000Oe, and taking the tailings as tailings III.

(10) Feeding the magnetic concentrate produced in the steps (9) and (7) into an Isa mill for grinding until the ore fineness is controlled to be 85% in the content of-20 mu m.

(11) And (3) feeding the ore grinding product generated in the step (10) into a drum type downstream low-intensity magnetic separation III, wherein the magnetic field intensity is 3200Oe, and the magnetic separation concentrate is used as a secondary iron concentrate III.

(12) And (3) feeding the magnetic separation tailings generated in the step (11) into a superconducting magnetic separation II for separation, controlling the magnetic field strength to be 27000Oe, and taking the obtained concentrate as primary titanium concentrate and tailings as tailings IV.

(13) Feeding the primary titanium concentrate into a roughing jet flow flotation machine for flotation, feeding the roughing concentrate into a fine flotation machine for fine concentration, feeding the roughing tailings into a scavenging jet flow flotation machine for scavenging, returning the scavenged concentrate and the fine tailings to roughing, and obtaining the concentrate as final concentrate by fine concentration and the scavenged tailings as tailings V.

(14) The process adopts sulfuric acid as a pH regulator, the pH value is 3.2, sodium hexametaphosphate is a dispersant, the total dosage is 150g/t, MOH is a collecting agent, the total dosage is 1600g/t, 2# oil is a foaming agent, and the total dosage is 75g/t

(15) And combining the tailings I, II, III, IV and V to obtain total tailings, and combining the secondary iron ore concentrates I, II and III to obtain the total secondary iron ore concentrate.

(16) The final product index obtained by the above steps is shown in table 2.

TABLE 2 implementation results of titanium recovery from tailings of a titanium separation plant in Panxi

Example 2:

in this example, tailings of a titanium separation plant of Xichang were selected, and as shown in Table 3, the TFe grade in the tailings was 13.50%, and TiO content was₂The grade was 6.74%.

TABLE 3 chemical composition analysis of tailings from Xichang titanium separation plant

The method specifically comprises the following steps:

(1) feeding the tailings into an ore pulp stirring barrel, adjusting the ore pulp into ore pulp with the ore pulp concentration of 25-50%, feeding the ore pulp into a slag separation sieve with the sieve pore diameter of 0.8-1.5mm, and screening, wherein the screening granularity is controlled to be 1.0 mm;

(2) directly discarding the screened products in the step (1), wherein the screened products are tailings I;

(3) feeding the undersize product obtained in the step (1) into a first-stage hydrocyclone, and controlling the classification granularity to be 0.038 mm;

(4) feeding the settled sand (the part with the granularity larger than 0.038 mm) of the hydrocyclone in the step (3) into a ball mill for grinding;

(5) feeding the ore grinding product obtained in the step (4) into a secondary hydrocyclone for classification, wherein the overflow classification granularity of the hydrocyclone is controlled to be 70% in the range of-0.074 mm; returning settled sand generated by the secondary hydrocyclone to the ball mill to form closed circuit grinding ore;

(6) and (5) feeding overflow generated by the secondary hydrocyclone in the step (5) into a low intensity magnetic separation I, wherein the magnetic field intensity is 2300Oe, and the magnetic separation concentrate is used as a secondary iron concentrate I.

(7) And (4) feeding the magnetic tailings generated in the step (6) into a pulsating high-gradient magnetic separator for separation, controlling the magnetic field intensity to be 6500Oe, and taking the tailings as tailings II.

(8) And (4) feeding the overflow generated by the hydrocyclone in the step (3) into a drum type downstream low-intensity magnetic separation II, wherein the magnetic field intensity is 2500Oe, and the magnetic separation concentrate is used as a secondary iron concentrate II.

(9) And (4) feeding the magnetic separation tailings generated in the step (8) into a superconducting magnetic separation I for separation, controlling the magnetic field intensity at 30000Oe, and taking the tailings as tailings III.

(10) Feeding the magnetic concentrate produced in the steps (9) and (7) into an Isa mill for grinding until the ore fineness is controlled to be 90% in the content of-20 mu m.

(11) And (3) feeding the ore grinding product generated in the step (10) into a drum type downstream low-intensity magnetic separation III, wherein the magnetic field intensity is 3200Oe, and the magnetic separation concentrate is used as a secondary iron concentrate III.

(12) And (3) feeding the magnetic separation tailings generated in the step (11) into a superconducting magnetic separation II for separation, controlling the magnetic field intensity to be 30000Oe, and taking the obtained concentrate as primary titanium concentrate and tailings as tailings IV.

(13) Feeding the primary titanium concentrate into a roughing jet flow flotation machine for flotation, feeding the roughing concentrate into a fine flotation machine for fine concentration, feeding the roughing tailings into a scavenging jet flow flotation machine for scavenging, returning the scavenged concentrate and the fine tailings to roughing, and obtaining the concentrate as final concentrate by fine concentration and the scavenged tailings as tailings V.

(14) The process adopts sulfuric acid as a pH regulator, the pH value is 3.8, sodium hexametaphosphate is a dispersant, the total dosage is 200g/t, MOH is a collecting agent, the total dosage is 1500g/t, 2# oil is a foaming agent, and the total dosage is 60g/t

(15) And combining the tailings I, II, III, IV and V to obtain total tailings, and combining the secondary iron ore concentrates I, II and III to obtain the total secondary iron ore concentrate.

(16) The final product index obtained by the above steps is shown in table 4.

TABLE 4 implementation results of titanium recovery from tailings of a titanium separation plant in Panxi

It should be particularly noted that the various components or steps in the above embodiments can be mutually intersected, replaced, added or deleted, and therefore, the combination formed by the reasonable permutation and combination conversion shall also belong to the protection scope of the present invention, and the protection scope of the present invention shall not be limited to the embodiments.

The above is an exemplary embodiment of the present disclosure, and the order of disclosure of the above embodiment of the present disclosure is only for description and does not represent the merits of the embodiment. It should be noted that the discussion of any embodiment above is exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to those examples, and that various changes and modifications may be made without departing from the scope, as defined in the claims. The functions, steps and/or actions of the method claims in accordance with the disclosed embodiments described herein need not be performed in any particular order. Furthermore, although elements of the disclosed embodiments of the invention may be described or claimed in the singular, the plural is contemplated unless limitation to the singular is explicitly stated.

Those of ordinary skill in the art will understand that: the discussion of any embodiment above is meant to be exemplary only, and is not intended to intimate that the scope of the disclosure, including the claims, of embodiments of the invention is limited to these examples; within the idea of an embodiment of the invention, also technical features in the above embodiment or in different embodiments may be combined and there are many other variations of the different aspects of an embodiment of the invention as described above, which are not provided in detail for the sake of brevity. Therefore, any omissions, modifications, substitutions, improvements, and the like that may be made without departing from the spirit and principles of the embodiments of the present invention are intended to be included within the scope of the embodiments of the present invention.