CN118080148A - Separation method and separation system for artificial rutile and iron oxide red - Google Patents
Separation method and separation system for artificial rutile and iron oxide red Download PDFInfo
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- 238000000926 separation method Methods 0.000 title claims abstract description 161
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 112
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 title claims abstract description 81
- 238000007885 magnetic separation Methods 0.000 claims abstract description 132
- 230000005484 gravity Effects 0.000 claims abstract description 87
- 239000000126 substance Substances 0.000 claims abstract description 61
- 239000012141 concentrate Substances 0.000 claims abstract description 33
- 239000011268 mixed slurry Substances 0.000 claims abstract description 14
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 79
- 239000006148 magnetic separator Substances 0.000 claims description 39
- 238000007599 discharging Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 14
- LDHBWEYLDHLIBQ-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide;hydrate Chemical compound O.[OH-].[O-2].[Fe+3] LDHBWEYLDHLIBQ-UHFFFAOYSA-M 0.000 claims description 9
- 230000007246 mechanism Effects 0.000 claims description 3
- 229960005191 ferric oxide Drugs 0.000 description 57
- 239000000463 material Substances 0.000 description 18
- 238000005260 corrosion Methods 0.000 description 9
- 239000002002 slurry Substances 0.000 description 9
- 238000004519 manufacturing process Methods 0.000 description 8
- 230000005389 magnetism Effects 0.000 description 7
- 230000007797 corrosion Effects 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 239000000696 magnetic material Substances 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 description 4
- 230000007547 defect Effects 0.000 description 4
- 238000011084 recovery Methods 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000011707 mineral Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000001174 ascending effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000004062 sedimentation Methods 0.000 description 2
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 1
- 238000005299 abrasion Methods 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005660 chlorination reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 210000003298 dental enamel Anatomy 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000010936 titanium Substances 0.000 description 1
- 229910052719 titanium Inorganic materials 0.000 description 1
- 239000004408 titanium dioxide Substances 0.000 description 1
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
- 239000001052 yellow pigment Substances 0.000 description 1
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Abstract
The application discloses a separation method and a separation system of artificial rutile and iron oxide red, wherein the separation method comprises the following steps: carrying out multistage magnetic separation on the iron oxide red and the synthetic rutile mixed slurry, carrying out the next stage magnetic separation on the nonmagnetic substance obtained by the previous stage magnetic separation to obtain the nonmagnetic substance obtained by the last stage magnetic separation and the magnetic substance obtained by each stage magnetic separation, and sequentially increasing the magnetic separation strength of the multistage magnetic separation; carrying out multistage gravity separation on the non-magnetic substances obtained by the final stage of magnetic separation to obtain overflow and underflow, wherein the overflow is iron oxide red concentrate; separating the underflow from the magnetic substance obtained by the magnetic separation of the last stage in a chute to obtain concentrate and tailings; combining the concentrate with magnetic substances obtained by magnetic separation of other stages except the last stage to obtain the artificial rutile concentrate. The synthetic rutile obtained by the separation method of the synthetic rutile and the iron oxide red has high yield and good grade.
Description
Technical Field
The invention relates to the technical field of mineral processing engineering, in particular to a separation method and a separation system of synthetic rutile and iron oxide red.
Background
The synthetic rutile is the same as natural rutile in composition and structural performance, is a high-quality substitute of natural rutile, is widely used for producing titanium dioxide by a chlorination method, can be also used for producing titanium tetrachloride, metallic titanium, enamel products and welding electrode coating, and can also be used for producing synthetic rutile yellow pigment.
The rust method produces a great amount of red iron oxide, the red iron oxide and the artificial rutile form slurry, the separation is needed, the separation modes adopted at home and abroad at present are basically gravity separation, such as hydrocyclone, spiral chute, hydrocyclone, vibrating screen or shaking table, the separation methods have the defects of low separation precision, low separation efficiency, large occupied area and the like, and because the slurry of the artificial rutile and the red iron oxide contains chloride ions, the PH is 2-3, the separation methods have the defects of serious equipment corrosion, frequent equipment maintenance, high production and operation cost and the like.
Therefore, the separation method is simple and efficient, high in equipment operation rate and low in operation cost, and has important significance.
Disclosure of Invention
The invention mainly aims to provide a separation method and a separation system for artificial rutile and iron oxide red, and aims to solve the problems of low separation efficiency and high production cost of the existing artificial rutile and iron oxide red.
In order to achieve the above purpose, the invention provides a separation method of artificial rutile and iron oxide red, comprising the following steps:
S10, carrying out multistage magnetic separation on the mixed slurry of the hydrated ferric oxide and the synthetic rutile, and carrying out the magnetic separation of the next stage on the non-magnetic substance obtained by the previous stage of magnetic separation to obtain the non-magnetic substance obtained by the last stage of magnetic separation and the magnetic substance obtained by the magnetic separation of each stage; wherein, the magnetic separation strength of the multistage magnetic separation is sequentially increased;
s20, carrying out multistage gravity separation on the nonmagnetic substances obtained by the final stage of magnetic separation to obtain overflow and underflow, wherein the overflow is iron oxide red concentrate;
s30, mixing the underflow obtained by multi-stage gravity separation with the magnetic substance obtained by the final stage magnetic separation, and carrying out chute separation to obtain concentrate and tailings;
S40, combining the concentrate obtained by chute separation with magnetic substances obtained by magnetic separation of other stages except the last stage to obtain the artificial rutile concentrate.
Optionally, in step S10, the multi-stage magnetic separation includes a first-stage magnetic separation, a second-stage magnetic separation, and a third-stage magnetic separation;
wherein the magnetic field intensity of the first-stage magnetic separation is 0.3T-0.4T; and/or the number of the groups of groups,
The magnetic field intensity of the second-stage magnetic separation is 0.5T-0.6T; and/or the number of the groups of groups,
The magnetic field intensity of the third-stage magnetic separation is 0.8T-1.0T.
Optionally, step S20 includes:
And carrying out multistage gravity separation on the nonmagnetic substances obtained by the final stage of magnetic separation, separating overflow obtained by the previous stage of gravity separation by using the next stage of gravity separation, and obtaining overflow obtained by the final stage of gravity separation as iron oxide red concentrate.
Optionally, step S20 further includes:
and returning the underflow obtained by the gravity separation of the next stage to the previous stage for gravity separation, wherein the underflow obtained by the gravity separation of the first stage is used for chute separation.
Optionally, step S30 further includes:
tailings obtained by chute separation are used for multistage gravity separation.
The invention also provides a separation system of the artificial rutile and the iron oxide red, which comprises a multi-stage magnetic separation device, a multi-stage gravity separation device and a chute which are sequentially arranged;
The multistage magnetic separation device comprises a plurality of magnetic separators which are sequentially arranged and is used for carrying out multistage magnetic separation on the hydrated ferric oxide and the synthetic rutile mixed slurry; the magnetic separators comprise a feeding hole, a magnetic substance discharging hole and a non-magnetic substance discharging hole, wherein the feeding hole of the next-stage magnetic separator is connected with the non-magnetic substance discharging hole of the previous-stage magnetic separator in the two adjacent magnetic separators;
the multistage gravity separation device comprises a plurality of classifying hoppers which are arranged in series and used for carrying out multistage gravity separation on the nonmagnetic substances separated by the multistage magnetic separation device; wherein the classifying hoppers comprise a feeding port, an overflow discharging port and an underflow discharging port, the non-magnetic substance discharge port of the final-stage magnetic separator is communicated with the feed port of the first classifying hopper; in the adjacent two-stage classifying hoppers, an overflow discharge port of the upper-stage classifying hopper is communicated with a feed port of the lower-stage classifying hopper;
And the feeding port of the chute is communicated with the underflow discharging port of the first-stage classifying hopper and the magnetic substance outlet of the last-stage magnetic separator, and is used for separating the underflow separated by the multi-stage gravity separation device and the magnetic substance separated by the last-stage magnetic separator.
Optionally, in the multi-stage gravity separation device, in the adjacent two-stage classification bucket, the underflow discharge port of the next-stage classification bucket is communicated with the feed inlet of the previous-stage classification bucket, and the underflow discharge port of the first-stage classification bucket is connected with the feed inlet of the chute.
Optionally, the magnetic separator is a plate magnetic separator; and/or the number of the groups of groups,
The classifying hopper is a sloping plate gravity hydraulic classifying hopper or a sloping pipe gravity hydraulic classifying hopper; and/or the number of the groups of groups,
The chute is a belt chute.
Optionally, an ascending water flow mechanism is arranged at the bottom of each classifying hopper; and/or the number of the groups of groups,
And a valve is arranged on the underflow outlet of each classifying hopper.
Optionally, the chute is a belt chute, and the belt of the belt chute is an anti-corrosion rubber belt.
According to the technical scheme, the separation and recovery of the artificial rutile and the iron oxide red are carried out in a gradient manner through multistage magnetic separation, multistage gravity separation and chute separation by utilizing the differences of magnetism, granularity, density and the like of the artificial rutile and the iron oxide red. The method comprises the steps of firstly carrying out multiple magnetic separation on mixed slurry of hydrated ferric oxide and artificial rutile, wherein the magnetic field intensity is sequentially increased, the artificial rutile with strong magnetism is preferentially screened out, and the magnetic separation of the final stage possibly carries out error magnetic separation on part of ferric oxide red, so that magnetic substances obtained by the magnetic separation of the final stage cannot be directly used as artificial rutile concentrate, and a small amount of the extremely weak or non-magnetic artificial rutile exists in non-magnetic substances obtained by the magnetic separation of the final stage. Therefore, the separation method of the synthetic rutile and the iron oxide red provided by the application has the advantages of high separation efficiency, and high yield and good grade of the separated synthetic rutile.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to the structures shown in these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of an embodiment of a method for separating synthetic rutile from iron oxide red according to the present invention;
FIG. 2 is a schematic flow chart of a multi-stage gravity separation process for separating synthetic rutile from red iron oxide in accordance with one embodiment of the present invention.
Description of the embodiments of the invention the reference numerals:
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and rear … …) are included in the embodiments of the present invention, the directional indications are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are correspondingly changed.
In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present invention.
The rust method produces a great amount of red iron oxide, the red iron oxide and the artificial rutile form slurry, the separation is needed, the separation modes adopted at home and abroad at present are basically gravity separation, such as hydrocyclone, spiral chute, hydrocyclone, vibrating screen or shaking table, the separation methods have the defects of low separation precision, low separation efficiency, large occupied area and the like, and because the slurry of the artificial rutile and the red iron oxide contains chloride ions, the PH is 2-3, the separation methods have the defects of serious equipment corrosion, frequent equipment maintenance, high production and operation cost and the like. Therefore, the separation method is simple and efficient, high in equipment operation rate and low in operation cost, and has important significance.
In view of the above, the invention provides a separation method and a separation system for artificial rutile and iron oxide red, which aim to solve the problems of low separation efficiency and high production cost of the existing artificial rutile and iron oxide red. Referring to fig. 1 to 2, fig. 1 is a schematic flow chart of an embodiment of a separation method of synthetic rutile and red iron oxide according to the present invention; FIG. 2 is a schematic flow chart of a multi-stage gravity separation process for separating synthetic rutile from red iron oxide in accordance with one embodiment of the present invention.
Referring to fig. 1, the separation method of the artificial rutile and the iron oxide red comprises the following steps:
S10, carrying out multistage magnetic separation on the mixed slurry of the hydrated ferric oxide and the synthetic rutile, and carrying out the magnetic separation of the next stage on the non-magnetic substance obtained by the previous stage of magnetic separation to obtain the non-magnetic substance obtained by the last stage of magnetic separation and the magnetic substance obtained by the magnetic separation of each stage; wherein, the magnetic separation strength of the multistage magnetic separation is sequentially increased;
s20, carrying out multistage gravity separation on the nonmagnetic substances obtained by the final stage of magnetic separation to obtain overflow and underflow, wherein the overflow is iron oxide red concentrate;
s30, mixing the underflow obtained by multi-stage gravity separation with the magnetic substance obtained by the final stage magnetic separation, and carrying out chute separation to obtain concentrate and tailings;
S40, combining the concentrate obtained by chute separation with magnetic substances obtained by magnetic separation of other stages except the last stage to obtain the artificial rutile concentrate.
According to the technical scheme, the separation and recovery of the artificial rutile and the iron oxide red are carried out in a gradient manner through multistage magnetic separation, multistage gravity separation and chute separation by utilizing the differences of magnetism, granularity, density and the like of the artificial rutile and the iron oxide red. The method comprises the steps of firstly carrying out multiple magnetic separation on mixed slurry of hydrated ferric oxide and artificial rutile, wherein the magnetic field intensity is sequentially increased, the artificial rutile with strong magnetism is preferentially screened out, and the magnetic separation of the final stage possibly carries out error magnetic separation on part of ferric oxide red, so that magnetic substances obtained by the magnetic separation of the final stage cannot be directly used as artificial rutile concentrate, and a small amount of the extremely weak or non-magnetic artificial rutile exists in non-magnetic substances obtained by the magnetic separation of the final stage. Therefore, the separation method of the synthetic rutile and the iron oxide red provided by the application has the advantages of high separation efficiency, and high yield and good grade of the separated synthetic rutile.
It should be noted that the multi-stage magnetic separation refers to performing multiple magnetic separation on a material, and the previous-stage magnetic separation and the next-stage magnetic separation are in a relative flow sequence of the material, for example, when performing the second-stage magnetic separation, that is, two magnetic separations, the material is firstly subjected to the first magnetic separation, and the non-magnetic material obtained by the first magnetic separation is then subjected to the second magnetic separation, where the first magnetic separation is the previous-stage magnetic separation of the second magnetic separation, and the last-stage magnetic separation is the second magnetic separation.
Further, in step S10, the multi-stage magnetic separation includes a first-stage magnetic separation, a second-stage magnetic separation, and a third-stage magnetic separation; wherein the magnetic field intensity of the first-stage magnetic separation is 0.3T-0.4T; the magnetic field intensity of the second-stage magnetic separation is 0.5T-0.6T; the magnetic field intensity of the third-stage magnetic separation is 0.8T-1.0T. In some embodiments of the invention, three magnetic separation is performed on the mixed slurry of the hydrated ferric oxide and the artificial rutile, namely three-stage magnetic separation is performed, the first magnetic separation is performed on the mixed slurry of the hydrated ferric oxide and the artificial rutile by adopting the magnetic field intensity of 0.3T-0.4T, so that the artificial rutile with the strongest magnetism is separated, the second magnetic separation is performed on the non-magnetic substance obtained by the first magnetic separation by adopting the magnetic field intensity of 0.5T-0.6T, so that the artificial rutile with weak magnetism is separated, and the first magnetic separation and the second magnetic separation can avoid the entrainment of the red iron oxide in the artificial rutile, so that the separation is incomplete and the quality of the artificial rutile is affected; and (3) carrying out third magnetic separation on the non-magnetic substance obtained by the second magnetic separation by adopting the magnetic field strength of 0.8-1.0T so as to separate the artificial rutile with weaker magnetism, wherein a part of iron oxide red is magnetically separated out together under the magnetic field strength, so that the magnetic substance obtained by the third magnetic separation, namely the last magnetic separation is treated by adopting the follow-up operation. It should be noted that, four-stage magnetic separation, five-stage magnetic separation, etc. can be also used, and the magnetic field intensity of each stage can be correspondingly adjusted, which is not limited by the invention. But better separation effect can be achieved by adopting three-stage magnetic separation and subsequent separation operation, and the production cost of more magnetic separation times is higher.
Referring to fig. 2 in combination, step S20 includes: and carrying out multistage gravity separation on the nonmagnetic substances obtained by the final stage of magnetic separation, separating overflow obtained by the previous stage of gravity separation by using the next stage of gravity separation, and obtaining overflow obtained by the final stage of gravity separation as iron oxide red concentrate. It should be noted that, fig. 2 illustrates three-stage gravity separation, but the multi-stage gravity separation in the present application may also be four-stage gravity separation, five-stage gravity separation, and the like, which is not limited to fig. 2. In each stage of gravity separation, the large-granularity and heavy artificial rutile is screened out along with the underflow, and the overflow is fed into a next stage of gravity separation device for further gravity separation, the non-screened artificial rutile in the previous stage is screened out, and so on, after multiple times of gravity separation, the iron oxide red in the finally obtained overflow is enriched in a large amount, so that iron oxide red concentrate with less impurities and high yield is obtained.
In addition, step S20 further includes: and returning the underflow obtained by the gravity separation of the next stage to the previous stage for gravity separation, wherein the underflow obtained by the gravity separation of the first stage is used for chute separation. The underflow obtained by gravity separation of the next stage returns to the previous stage for gravity separation, so that circulation can be formed, and meanwhile, the unscreened rutile can be screened for multiple times. The underflow obtained by the first-stage gravity separation not only contains most of the synthetic rutile, but also contains a small amount of iron oxide red, so that chute separation can be carried out to further enrich the synthetic rutile, and the yield of the synthetic rutile is improved.
Further, step S30 further includes: tailings obtained by chute separation are used for multistage gravity separation. Besides the enriched artificial rutile concentrate, tailings containing the artificial iron oxide red exist after chute separation, and gravity separation is carried out again to form circulation, so that the artificial rutile and the iron oxide red can be better separated, and the yield of the iron oxide red is improved.
The invention also provides a separation system of the artificial rutile and the iron oxide red, which comprises a multi-stage magnetic separation device, a multi-stage gravity separation device and a chute which are sequentially arranged; the multistage magnetic separation device comprises a plurality of magnetic separators which are sequentially arranged and is used for carrying out multistage magnetic separation on the hydrated ferric oxide and the synthetic rutile mixed slurry; the magnetic separators comprise a feeding hole, a magnetic substance discharging hole and a non-magnetic substance discharging hole, wherein the feeding hole of the next-stage magnetic separator is connected with the non-magnetic substance discharging hole of the previous-stage magnetic separator in the two adjacent magnetic separators; the multistage gravity separation device comprises a plurality of classifying hoppers which are arranged in series and used for carrying out multistage gravity separation on the nonmagnetic substances separated by the multistage magnetic separation device; wherein the classifying hoppers comprise a feeding port, an overflow discharging port and an underflow discharging port, the non-magnetic substance discharge port of the final-stage magnetic separator is communicated with the feed port of the first classifying hopper; in the adjacent two-stage classifying hoppers, an overflow discharge port of the upper-stage classifying hopper is communicated with a feed port of the lower-stage classifying hopper; and the feeding port of the chute is communicated with the underflow discharging port of the first-stage classifying hopper and the magnetic substance outlet of the last-stage magnetic separator, and is used for separating the underflow separated by the multi-stage gravity separation device and the magnetic substance separated by the last-stage magnetic separator.
According to the separation system of the artificial rutile and the iron oxide red, the multistage magnetic separation device is adopted to carry out multistage magnetic separation on the mixed slurry of the iron oxide red and the artificial rutile, the magnetic field intensity of the multistage magnetic separation device is sequentially increased, so that the artificial rutile with weaker magnetic intensity is sequentially screened out, a small amount of artificial rutile with weaker magnetic or without magnetic is also present in the material discharged from the non-magnetic material discharge port of the last stage magnetic separator, the material discharged from the non-magnetic material discharge port of the last stage magnetic separator is further subjected to gravity separation by adopting the plurality of classification hoppers arranged in series, the classification hoppers classify according to the differences of the mineral specific gravity and the sedimentation velocity of mineral particles in a medium, and the particle size of the iron oxide red is very thin, so that the particle size of the artificial red is slightly thick, and the sedimentation velocity difference exists between the two materials, so that the material at the overflow discharge port is mainly the iron oxide red, the overflow discharge port of the upper stage classification hopper is communicated with the material inlet of the next stage classification hopper, and the artificial rutile in overflow is subjected to multiple gravity screening, so that the content of the iron oxide red in the overflow is improved, and the yield of the iron oxide red is improved. Because the material from the underflow discharge port of the first-stage classifying hopper is mixed with part of iron oxide red, the material from the underflow discharge port of the first-stage classifying hopper is introduced into the feed port of the chute for enriching the artificial rutile, the iron oxide red in the material from the underflow discharge port of the first-stage classifying hopper is further separated, the grade of the artificial rutile is improved, meanwhile, the material from the magnetic material outlet of the final-stage magnetic separator is also mixed with the iron oxide red, and the material from the magnetic material outlet of the final-stage magnetic separator is introduced into the feed port of the chute for enriching the artificial rutile based on the reasons, so that the grade of the artificial rutile is improved. Therefore, the separation system of the synthetic rutile and the iron oxide red provided by the application has the advantages of high separation efficiency, and high yield and good grade of the separated synthetic rutile.
Further, in the multi-stage gravity separation device, in the adjacent two-stage classifying hoppers, the underflow discharge port of the lower-stage classifying hopper is communicated with the feed inlet of the upper-stage classifying hopper, and the underflow discharge port of the first-stage classifying hopper is connected with the feed inlet of the chute. The material from the underflow discharge port of the lower stage classifying hopper returns to the feed port of the upper stage classifying hopper for gravity separation, so that a separation system can form closed circulation to improve the separation efficiency of the artificial rutile and the iron oxide red, and meanwhile, the unscreened rutile can be screened for multiple times. The material from the underflow discharge port of the first-stage classifying hopper not only has most of the synthetic rutile, but also has less iron oxide red, so that the material can be introduced into the feed port of the chute for separation so as to further enrich the synthetic rutile, thereby improving the yield of the synthetic rutile.
Further, the magnetic separator is a plate magnetic separator, and because the rust slurry containing the artificial rutile and the iron oxide red has a temperature of about 60 ℃ during separation, the rust slurry is strong acid and has chloride ions, and the plate magnetic separator can reduce the corrosion of the rust slurry containing the artificial rutile and the iron oxide red to the magnetic separator, thereby prolonging the service life of the equipment. The classifying hopper is an inclined plate gravity hydraulic classifying hopper or an inclined tube gravity hydraulic classifying hopper, the classifying hopper can also adopt an anti-corrosion material lining, coarse grain synthetic rutile is recovered by magnetic separation, most of the granularity of slurry entering the gravity classifying tank is less than 30 mu m, and the abrasion capacity of the gravity classifying tank is limited. The chute is a belt chute. When materials enter a belt chute, the artificial rutile is deposited at the bottom of the chute, is carried to a concentrate end along with the movement of the belt, is discharged under the action of flushing water, and iron oxide red enters a tailing end because of fine particles and light specific gravity and can not be deposited at the bottom of the belt, and can be conveyed to a gravity separation device for re-separation. It should be noted that the present invention is not limited to the kinds of the chute, but the use of the belt chute can improve the efficiency and effect of separation relative to a normal chute. The plate-type magnetic separator and the belt chute can be adopted simultaneously or respectively, and the system has simple structure, low failure rate, corrosion-resistant rubber at the parts contacting the slurry, difficult corrosion of equipment, long service life and low maintenance rate during the simultaneous use. In addition, the belt chute can perform gradient adjustment and belt running speed adjustment according to requirements, so that the separation precision of the artificial rutile and the iron oxide red is accurately controlled; the plate magnetic separator can realize the adjustment of the small magnetic field intensity range by adjusting the distance between the belt and the magnetic system, thereby precisely controlling the separation precision of the artificial rutile and the iron oxide red of the plate magnetic separator.
In addition, the bottom of each classifying hopper is provided with an ascending water flow mechanism, and the underflow outlet of each classifying hopper is provided with a valve. The bottom of each classifying hopper is independently provided with an upward water flow device and an underflow valve, so that the separation of the artificial rutile and the iron oxide red can be accurately controlled by adjusting the upward water flow and the opening of the underflow valve.
Further, the chute is a belt chute, and the belt of the belt chute is an anti-corrosion rubber belt. Because the rust pulp has the temperature of about 60 ℃ during separation, and the rust pulp is strong in acidity and has chloride ions, the corrosion-resistant rubber belt can be prevented from being corroded, and the service life of equipment is prolonged.
The following technical solutions of the present invention will be described in further detail with reference to specific examples and drawings, and it should be understood that the following examples are only for explaining the present invention and are not intended to limit the present invention.
Examples
The synthetic rutile and iron oxide red mixed slurry is separated by adopting the following method:
(1) Performing three-stage magnetic separation on the iron oxide red and artificial rutile mixed slurry, wherein the magnetic field intensity of the first-stage magnetic separation is 0.35T, the magnetic field intensity of the second-stage magnetic separation is 0.5T, the magnetic field intensity of the third-stage magnetic separation is 0.9T, and the non-magnetic substance obtained by the previous-stage magnetic separation is subjected to the next-stage magnetic separation to obtain the non-magnetic substance obtained by the third-stage magnetic separation and the magnetic substance obtained by each-stage magnetic separation;
(2) Carrying out multistage gravity separation on the nonmagnetic substances obtained by the magnetic separation of the last stage, separating overflow obtained by the gravity separation of the last stage by using the gravity of the next stage, returning underflow obtained by the gravity separation of the next stage to the last stage for gravity separation, and carrying out chute separation on the underflow obtained by the gravity separation of the first stage; the overflow obtained by the gravity separation of the last stage is iron oxide red concentrate;
(3) Mixing the underflow obtained by the first-stage gravity separation with the magnetic substance obtained by the third-stage magnetic separation, and carrying out chute separation to obtain concentrate and tailings, wherein the tailings obtained by the chute separation are used for carrying out multistage gravity separation;
(4) And combining the concentrate obtained by chute separation with magnetic substances obtained by magnetic separation of all stages except the last stage to obtain the artificial rutile concentrate.
Comparative example
Firstly, a cyclone is utilized to perform primary separation of the artificial rutile and the iron oxide red, the underflow of the cyclone is fed into a shaking table for separation, the shaking table concentrate is the artificial rutile concentrate, and the shaking table tailings and the cyclone overflow are the iron oxide red concentrate.
The data pairs of the separation methods of the artificial rutile and the iron oxide red on the production indexes provided in the examples and the comparative examples are shown in table 1.
Table 1 production index obtained in examples and comparative examples
As can be seen from Table 1, the production index of the artificial rutile and iron oxide red method adopted in the embodiment of the application is obviously superior to that of the comparative example, and the method is specifically characterized in that the content of TiO 2 in the artificial rutile concentrate obtained in the embodiment is 1.2 percent higher than that in the comparative example, the recovery rate is 4.5 percent higher, the TFe content in the iron oxide red concentrate is also about 4.7 percent higher, and the recovery rate is also about 2 percent higher. The method for separating the artificial rutile from the iron oxide red provided by the application is proved to have high yield and good grade.
The foregoing is merely a preferred embodiment of the present invention and is not intended to limit the scope of the present invention, but various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The separation method of the artificial rutile and the iron oxide red is characterized by comprising the following steps:
S10, carrying out multistage magnetic separation on the iron oxide red and the synthetic rutile mixed slurry, and carrying out the next stage magnetic separation on the non-magnetic substance obtained by the previous stage magnetic separation to obtain the non-magnetic substance obtained by the last stage magnetic separation and the magnetic substance obtained by each stage magnetic separation, wherein the magnetic separation strength of the multistage magnetic separation is sequentially increased;
s20, carrying out multistage gravity separation on the nonmagnetic substances obtained by the final stage of magnetic separation to obtain overflow and underflow, wherein the overflow is iron oxide red concentrate;
s30, mixing the underflow obtained by multi-stage gravity separation with the magnetic substance obtained by the final stage magnetic separation, and carrying out chute separation to obtain concentrate and tailings;
S40, combining the concentrate obtained by chute separation with magnetic substances obtained by magnetic separation of other stages except the last stage to obtain the artificial rutile concentrate.
2. The method for separating synthetic rutile from red iron oxide of claim 1, wherein in step S10, the multi-stage magnetic separation comprises a first stage magnetic separation, a second stage magnetic separation, and a third stage magnetic separation;
wherein the magnetic field intensity of the first-stage magnetic separation is 0.3T-0.4T; and/or the number of the groups of groups,
The magnetic field intensity of the second-stage magnetic separation is 0.5T-0.6T; and/or the number of the groups of groups,
The magnetic field intensity of the third-stage magnetic separation is 0.8T-1.0T.
3. The method for separating synthetic rutile from red iron oxide of claim 1, wherein step S20 comprises:
And carrying out multistage gravity separation on the nonmagnetic substances obtained by the final stage of magnetic separation, separating overflow obtained by the previous stage of gravity separation by using the next stage of gravity separation, and obtaining overflow obtained by the final stage of gravity separation as iron oxide red concentrate.
4. The method for separating synthetic rutile from red iron oxide of claim 3, wherein step S20 further comprises:
and returning the underflow obtained by the gravity separation of the next stage to the previous stage for gravity separation, wherein the underflow obtained by the gravity separation of the first stage is used for chute separation.
5. The method of separating synthetic rutile from red iron oxide of claim 1, wherein step S30 further comprises:
tailings obtained by chute separation are used for multistage gravity separation.
6. The separation system of the artificial rutile and the iron oxide red is characterized by comprising a multi-stage magnetic separation device, a multi-stage gravity separation device and a chute which are sequentially arranged;
The multistage magnetic separation device comprises a plurality of magnetic separators which are sequentially arranged and is used for carrying out multistage magnetic separation on the hydrated ferric oxide and the synthetic rutile mixed slurry; the magnetic separators comprise a feeding hole, a magnetic substance discharging hole and a non-magnetic substance discharging hole, wherein the feeding hole of the next-stage magnetic separator is connected with the non-magnetic substance discharging hole of the previous-stage magnetic separator in the two adjacent magnetic separators;
the multistage gravity separation device comprises a plurality of classifying hoppers which are arranged in series and used for carrying out multistage gravity separation on the nonmagnetic substances separated by the multistage magnetic separation device; wherein the classifying hoppers comprise a feeding port, an overflow discharging port and an underflow discharging port, the non-magnetic substance discharge port of the final-stage magnetic separator is communicated with the feed port of the first classifying hopper; in the adjacent two-stage classifying hoppers, an overflow discharge port of the upper-stage classifying hopper is communicated with a feed port of the lower-stage classifying hopper;
And the feeding end of the chute is communicated with the underflow discharging port of the first-stage classifying hopper and the magnetic substance outlet of the last-stage magnetic separator, and is used for separating the underflow separated by the multi-stage gravity separation device and the magnetic substance separated by the last-stage magnetic separator.
7. The separation system of artificial rutile and iron oxide red according to claim 6, wherein in the multi-stage gravity separation device, in two adjacent stages of classifying hoppers, an underflow discharge port of a lower stage classifying hopper is communicated with a feed inlet of an upper stage classifying hopper, and an underflow discharge port of a first stage classifying hopper is connected with a feed inlet of the chute.
8. The separation system of synthetic rutile and red iron oxide of claim 6, wherein the magnetic separator is a plate magnetic separator; and/or the number of the groups of groups,
The classifying hopper is a sloping plate gravity hydraulic classifying hopper or a sloping pipe gravity hydraulic classifying hopper; and/or the number of the groups of groups,
The chute is a belt chute.
9. The separation system of synthetic rutile and iron oxide red according to claim 6, wherein a water-lifting mechanism is arranged at the bottom of each classifying hopper; and/or the number of the groups of groups,
And a valve is arranged on the underflow outlet of each classifying hopper.
10. The separation system of synthetic rutile and iron oxide red according to claim 6 wherein the chute is a belt chute and the belt of the belt chute is an anti-corrosive rubber belt.
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