CN116212517A - Separation and drying method and system for synthetic rutile - Google Patents
Separation and drying method and system for synthetic rutile Download PDFInfo
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- CN116212517A CN116212517A CN202310044958.XA CN202310044958A CN116212517A CN 116212517 A CN116212517 A CN 116212517A CN 202310044958 A CN202310044958 A CN 202310044958A CN 116212517 A CN116212517 A CN 116212517A
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- 238000001035 drying Methods 0.000 title claims abstract description 103
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 title claims abstract description 88
- 238000000926 separation method Methods 0.000 title claims abstract description 59
- 239000007788 liquid Substances 0.000 claims abstract description 108
- 239000002002 slurry Substances 0.000 claims abstract description 69
- 239000007787 solid Substances 0.000 claims abstract description 38
- 239000000463 material Substances 0.000 claims abstract description 27
- 238000004537 pulping Methods 0.000 claims abstract description 24
- 238000004062 sedimentation Methods 0.000 claims abstract description 21
- LDHBWEYLDHLIBQ-UHFFFAOYSA-M iron(3+);oxygen(2-);hydroxide;hydrate Chemical compound O.[OH-].[O-2].[Fe+3] LDHBWEYLDHLIBQ-UHFFFAOYSA-M 0.000 claims abstract description 19
- 238000007599 discharging Methods 0.000 claims abstract description 16
- 238000006243 chemical reaction Methods 0.000 claims abstract description 14
- YDZQQRWRVYGNER-UHFFFAOYSA-N iron;titanium;trihydrate Chemical compound O.O.O.[Ti].[Fe] YDZQQRWRVYGNER-UHFFFAOYSA-N 0.000 claims abstract description 13
- 238000005260 corrosion Methods 0.000 claims abstract description 12
- 230000007797 corrosion Effects 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims abstract description 12
- 238000006056 electrooxidation reaction Methods 0.000 claims abstract description 8
- 208000005156 Dehydration Diseases 0.000 claims abstract description 4
- 230000018044 dehydration Effects 0.000 claims abstract description 4
- 238000006297 dehydration reaction Methods 0.000 claims abstract description 4
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims description 33
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 26
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 23
- 238000001914 filtration Methods 0.000 claims description 21
- 238000005406 washing Methods 0.000 claims description 18
- 239000008235 industrial water Substances 0.000 claims description 12
- 229910052742 iron Inorganic materials 0.000 claims description 11
- 238000011084 recovery Methods 0.000 claims description 11
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 10
- 238000004064 recycling Methods 0.000 claims description 9
- 239000002994 raw material Substances 0.000 claims description 8
- 239000012065 filter cake Substances 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 7
- 239000003345 natural gas Substances 0.000 claims description 5
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 5
- 239000002918 waste heat Substances 0.000 claims description 5
- 239000000706 filtrate Substances 0.000 claims description 4
- 230000035484 reaction time Effects 0.000 claims description 4
- 238000002485 combustion reaction Methods 0.000 claims description 3
- 239000011344 liquid material Substances 0.000 claims description 3
- 239000011343 solid material Substances 0.000 claims description 3
- 239000007789 gas Substances 0.000 claims description 2
- 230000009467 reduction Effects 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract description 10
- 230000000694 effects Effects 0.000 abstract description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 8
- 239000002245 particle Substances 0.000 description 8
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 description 7
- 239000010936 titanium Substances 0.000 description 7
- 229910052719 titanium Inorganic materials 0.000 description 7
- 239000000243 solution Substances 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 150000002500 ions Chemical class 0.000 description 3
- 239000002253 acid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000005265 energy consumption Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- NDLPOXTZKUMGOV-UHFFFAOYSA-N oxo(oxoferriooxy)iron hydrate Chemical compound O.O=[Fe]O[Fe]=O NDLPOXTZKUMGOV-UHFFFAOYSA-N 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000007790 solid phase Substances 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- -1 Iron ions Chemical class 0.000 description 1
- 229910010413 TiO 2 Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000012993 chemical processing Methods 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000008151 electrolyte solution Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000009776 industrial production Methods 0.000 description 1
- 239000007791 liquid phase Substances 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/04—Oxides; Hydroxides
- C01G23/047—Titanium dioxide
- C01G23/053—Producing by wet processes, e.g. hydrolysing titanium salts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D36/00—Filter circuits or combinations of filters with other separating devices
- B01D36/04—Combinations of filters with settling tanks
- B01D36/045—Combination of filters with centrifugal separation devices
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B1/00—Preliminary treatment of solid materials or objects to facilitate drying, e.g. mixing or backmixing the materials to be dried with predominantly dry solids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F26—DRYING
- F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
- F26B3/00—Drying solid materials or objects by processes involving the application of heat
- F26B3/02—Drying solid materials or objects by processes involving the application of heat by convection, i.e. heat being conveyed from a heat source to the materials or objects to be dried by a gas or vapour, e.g. air
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- Chemical & Material Sciences (AREA)
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- Chemical Kinetics & Catalysis (AREA)
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- General Engineering & Computer Science (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
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Abstract
The invention relates to a synthetic rutile separation and drying method and a synthetic rutile separation and drying system; the method comprises the following steps: A. electrochemical corrosion reaction is carried out on the reduced ilmenite and the corrosion liquid in the corrosion tank; B. b, performing primary solid-liquid separation on the hydrated ferric oxide and the synthetic rutile slurry generated in the step A by using a spiral discharging sedimentation centrifuge; C. b, carrying out secondary solid-liquid separation on the artificial rutile slurry separated in the step B by a first-stage belt type vacuum filter; the separated solid enters a synthetic rutile slurry pulping tank; D. c, feeding the slurry of the pulping tank in the step C into a second-stage belt type vacuum filter for third solid-liquid separation; E. d, enabling the artificial rutile wet material in the step D to enter a primary drying cylinder through a belt conveyor to be dehydrated and dried for the first time; F. e, the primary drying material in the step enters a secondary drying cylinder through a belt conveyor to carry out secondary dehydration and drying, and the synthetic rutile which reaches the standard is obtained; the invention has good separating and drying effects, reduces equipment failure rate, improves production efficiency and saves energy.
Description
Technical Field
The invention relates to the technical field of rutile production and manufacturing, in particular to a synthetic rutile separation and drying method and system.
Background
The synthetic rutile is also called synthetic rutile, and is a titanium-rich raw material produced by separating most of iron components in ilmenite by using a chemical processing method, wherein the components and structural properties of the titanium-rich raw material are the same as those of the natural rutile, and the titanium-rich raw material is 85% -96% according to different fluctuation of a processing technology, so that the titanium-rich raw material is a high-quality substitute of the natural rutile, and the rust method has certain superiority on the processing rutile in the method for preparing the synthetic rutile.
The method for producing the artificial rutile by the rust method uses reduced titanium as a raw material, in the rust liquid, the reduced titanium is oxidized and then enters into the solution after being corroded, and the titanium-rich material after separating the iron is the artificial rutile. The synthetic rutile in the rust slurry is separated from ferric oxide, and the synthetic rutile product meeting the requirements is obtained after links such as washing, dehydration, drying, screening and the like.
However, in the process of the production treatment of the artificial rutile, when the existing artificial rutile is separated from ferric oxide, a high-frequency vibrating screen is mostly adopted for solid-liquid separation, and the vibrating screen motor vibrates greatly and has high frequency, so that the vibrating screen or screen is often damaged, the equipment failure rate is high, the production efficiency is lower, and the production yield of a system is severely restricted; meanwhile, the field environment is poor in sanitation, and the phenomena of running, overflowing, dripping and leaking are serious. The moisture content of the synthetic rutile wet material from the existing filtering system exceeds 10%, drying and dewatering are needed, and a large amount of energy consumption is needed to meet the moisture requirement of the synthetic rutile product.
Disclosure of Invention
The invention aims to provide a method and a system for separating and drying artificial rutile, which adopt two-stage filtration, have good separation effect, reduce equipment failure rate, improve production efficiency, ensure stable product quality, ensure that the separated artificial rutile reaches required indexes, adopt two drying processes, have good drying effect and save energy.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a separation and drying system for artificial rutile comprises a rust tank, a spiral discharge sedimentation centrifuge, a first-stage belt vacuum filter, a slurry pulping tank, a second-stage belt vacuum filter, a first-stage drying cylinder and a second-stage drying cylinder which are sequentially arranged,
the rust tank is used for reducing ilmenite and rust liquid to generate electrochemical rust reaction, and the generated hydrated ferric oxide and synthetic rutile slurry are conveyed to a spiral discharge sedimentation centrifuge;
the spiral discharging sedimentation centrifuge is used for carrying out primary solid-liquid separation on the hydrated ferric oxide and the synthetic rutile slurry generated by the rust tank, and conveying the separated solids to the first-stage belt type vacuum filter through a pump;
the first-stage belt type vacuum filter is used for carrying out secondary solid-liquid separation on the separated solid slurry;
the slurry pulping tank is used for storing solid slurry generated after the first-stage belt type vacuum filter performs the second solid-liquid separation and conveying the solid slurry to the second-stage belt type vacuum filter,
carrying out third solid-liquid separation on solid slurry in a slurry making tank by a second-stage belt vacuum filter;
the first-stage drying cylinder and the second-stage drying cylinder are used for drying the solids separated by the second-stage belt type vacuum filter.
Further, the spiral discharging sedimentation centrifuge is also connected with a hydrated iron oxide storage tank, which is used for storing liquid materials after the spiral discharging sedimentation centrifuge carries out solid-liquid separation on the hydrated iron oxide and the synthetic rutile slurry for the first time;
the first-stage belt type vacuum filter is also connected with a filter liquid filtering tank which is used for storing liquid generated after the second solid-liquid separation of the first-stage belt type vacuum filter, and the liquid in the filter liquid filtering tank can be recycled to be used as washing water of the first-stage belt type vacuum filter;
the liquid in the filter liquid pool of the belt filter is transferred into the rust recovery liquid pool through a pump except the washing water provided for the first-stage belt type vacuum filter, and then is conveyed to the rust tank through the pump for recycling;
and the solid materials separated by the second-stage belt type vacuum filter are conveyed to a first-stage drying cylinder through a belt conveyor, and the first-stage drying cylinder is dried and then conveyed to a second-stage drying cylinder through the belt conveyor for secondary drying.
The invention also provides a synthetic rutile separation and drying method, which comprises the following steps:
A. electrochemical corrosion reaction is carried out on the reduced ilmenite and the corrosion liquid in a corrosion tank to generate hydrated ferric oxide and synthetic rutile slurry;
B. feeding the slurry obtained in the step A into a spiral discharge sedimentation centrifuge for primary solid-liquid separation, enabling the separated liquid to enter a hydrated iron oxide storage tank, and enabling the separated solid to enter a filtering system through a pump;
C. b, sending the separated artificial rutile slurry in the step B into a first-stage belt type vacuum filter for secondary solid-liquid separation, transferring the separated liquid into a filtrate tank of the belt type filter, returning the separated liquid to serve as washing water of the first-stage belt type vacuum filter for recycling, transferring the redundant liquid into a rust recovery liquid tank through a pump, and returning the redundant liquid to the step A through the pump to serve as rust reaction raw materials for recycling; the separated solids enter a synthetic rutile slurry pulping tank, and industrial water is used as a water source of the slurry pulping tank;
D. c, feeding the slurry of the pulping tank into a second-stage belt type vacuum filter for third solid-liquid separation, and feeding the separated liquid into a filtering liquid pool of the belt type filter, wherein the washing water of the second-stage belt type vacuum filter adopts industrial water; the separated solid is artificial rutile wet material, and the artificial rutile wet material enters a pre-drying procedure through a belt conveyor;
E. d, enabling the artificial rutile wet material in the step D to enter a primary drying cylinder through a belt conveyor to be dehydrated and dried for the first time;
F. and E, feeding the primary drying material in the step E into a secondary drying cylinder through a belt conveyor to carry out secondary dehydration and drying, and obtaining the synthetic rutile with the moisture reaching the standard.
Preferably, in the step A, the electrochemical corrosion reaction time is controlled to be 4-12 hours, the concentration of ore pulp is configured to be 8% -13%, the iron content of ore bodies is more than 10%, and the mass ratio of the corrosion liquid to the reduced ilmenite is 1.5-3:1.
Preferably, when the hydrated ferric oxide slurry in the step B is sent to a spiral discharge decanter centrifuge for the first solid-liquid separation, the solid content in the separated liquid is controlled to be less than or equal to 5 percent, and the liquid content in the separated solid is controlled to be less than or equal to 30 percent.
Specifically, industrial water is added into the solid of the slurry pulping tank after the solid-liquid separation in the step C for pulping, so that the density of the slurry is 1.30-1.5g/ml.
Preferably, when the artificial rutile slurry in the step D is sent to a second-stage belt vacuum filter for third solid-liquid separation, the water content of a filter cake is controlled to be less than or equal to 15 percent, and dry basis TiO is controlled 2 More than or equal to 87 percent and less than or equal to 6 percent of dry basis total iron.
Preferably, in the step E, the drying heat source of the primary drying cylinder uses hot air exchanged by a waste heat recovery system to control the moisture of the drying material to be less than or equal to 5 percent.
Preferably, the second-stage drying cylinder in the step F adopts heat generated by natural gas combustion to dry the materials, and the obtained synthetic rutile contains TiO 2 The content reaches more than 87 percent.
Compared with the prior art, the invention has the beneficial effects that:
1. the metallic iron in the reduced ilmenite undergoes electrochemical corrosion reaction in the corrosion tank for a sufficient reaction time to become hydrated iron oxide particles.
2. The solid phase particles (artificial rutile) with higher density than the liquid phase (hydrated ferric oxide particle solution) are settled to the inner wall of the rotary drum by the strong centrifugal force generated by the rotary drum of the spiral discharging settling centrifuge, and the solid phase (artificial rutile) deposited on the inner wall of the rotary drum is pushed to the outlet of the small end of the rotary drum to be discharged by the relative movement of the spiral and the rotary drum due to the different rotation speeds of the spiral and the rotary drum, and the separated clear liquid (hydrated ferric oxide particle solution) is discharged from the other end of the centrifuge to enter the hydrated ferric oxide storage tank. The spiral discharging sedimentation centrifuge has the advantages of high automation degree, low cost, high equipment stability, low failure rate, good field environmental sanitation and capability of effectively solving the problems of serious phenomena of running, overflowing, dripping and leaking on site.
3. The belt type vacuum filter is novel, efficient and continuously operated solid-liquid separation equipment, and the filtration, washing, slag discharging and filter cloth cleaning in the production process can be sequentially completed along with the operation of the adhesive belt, so that the labor cost is greatly reduced, the filtration efficiency is improved, and the energy consumption is reduced. The invention adopts a two-stage filtration process, and aims to separate the hydrated ferric oxide from the synthetic rutile slurry by the filtration of a first-stage belt type vacuum filter, and the filtrate in a filter tank of the belt filter is circularly and multi-stage washed, so that the content of the hydrated ferric oxide mixed in a filter cake (namely the synthetic rutile) is as small as possible, and meanwhile, the filtration capacity and the production efficiency are greatly improved; the second stage belt vacuum filter filters and carries out multistage washing by adding industrial water as washing water, so that the filter cake components can meet the quality standard requirements of the synthetic rutile product.
4. The invention adopts a two-stage drying process, and aims to effectively utilize hot air exchanged by a waste heat recovery system for primary drying of a filter cake, so that the moisture content of the filter cake is reduced, and therefore, the consumption of a part of natural gas used for secondary drying is reduced, the effect of high efficiency and energy saving is achieved, and meanwhile, the primary moisture of the secondary drying material is low, and the drying capacity is greatly improved.
Drawings
FIG. 1 is a schematic diagram of a process flow of a synthetic rutile separation and drying process and system according to the present invention.
Description of the embodiments
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.
The invention provides a synthetic rutile separation and drying system, which comprises a rust groove, a spiral discharging sedimentation centrifuge, a first-stage belt type vacuum filter, a slurry pulping groove, a second-stage belt type vacuum filter, a first-stage drying cylinder and a second-stage drying cylinder which are sequentially arranged,
the rust tank is used for reducing ilmenite and rust liquid to generate electrochemical rust reaction, and the generated hydrated ferric oxide and synthetic rutile slurry are conveyed to a spiral discharge sedimentation centrifuge;
the spiral discharging sedimentation centrifuge is used for carrying out primary solid-liquid separation on the hydrated ferric oxide and the synthetic rutile slurry generated by the rust tank, and conveying the separated solids to the first-stage belt type vacuum filter through a pump;
the first-stage belt type vacuum filter is used for carrying out secondary solid-liquid separation on the separated solid slurry;
the slurry pulping tank is used for storing solid slurry generated after the first-stage belt type vacuum filter performs the second solid-liquid separation and conveying the solid slurry to the second-stage belt type vacuum filter,
carrying out third solid-liquid separation on solid slurry in a slurry making tank by a second-stage belt vacuum filter;
the first-stage drying cylinder and the second-stage drying cylinder are used for drying the solids separated by the second-stage belt type vacuum filter.
Further, the spiral discharging sedimentation centrifuge is also connected with a hydrated iron oxide storage tank, which is used for storing liquid materials after the spiral discharging sedimentation centrifuge carries out solid-liquid separation on the hydrated iron oxide and the synthetic rutile slurry for the first time;
the first-stage belt type vacuum filter is also connected with a filter liquid filtering tank which is used for storing liquid generated after the second solid-liquid separation of the first-stage belt type vacuum filter, and the liquid in the filter liquid filtering tank can be recycled to be used as washing water of the first-stage belt type vacuum filter;
the liquid in the filter liquid pool of the belt filter is transferred into the rust recovery liquid pool through a pump except the washing water provided for the first-stage belt type vacuum filter, and then is conveyed to the rust tank through the pump for recycling;
and the solid materials separated by the second-stage belt type vacuum filter are conveyed to a first-stage drying cylinder through a belt conveyor, and the first-stage drying cylinder is dried and then conveyed to a second-stage drying cylinder through the belt conveyor for secondary drying.
The invention also provides a synthetic rutile separation and drying method, which comprises the following steps:
A. electrochemical corrosion reaction is carried out on the reduced ilmenite and the corrosion liquid in a corrosion tank to generate hydrated ferric oxide and synthetic rutile slurry; in the preferred embodiment of the invention, the electrochemical corrosion reaction time in the step A is controlled to be 4-12 hours, the concentration of ore pulp is configured to be 8% -13%, the iron content of ore body is more than 10%, and the mass ratio of the corrosion liquid to the reduced ilmenite is 1.5-3:1.
Electrochemical rust reaction principle: the metallic iron crystallites in the reduced ilmenite particles correspond to the anodes of the galvanic cells and the particle appearance corresponds to the cathodes. At the anode, fe loses electrons to Fe 2+ Ions enter the solution.
Anode reaction: fe=fe 2+ +2e
In the cathode region, oxygen in the solution accepts electrons to form OH - Ion, fe dissolved in particle 2+
Ions diffuse into the electrolyte solution on the outer surface of the particles along the micropores, and air is introduced to further oxidize the ions to generate hydrated ferric oxide fine particle sediment:
cathode reaction: o (O) 2 +2H 2 O+4e=4OH -
Iron ions and OH - Combined into Fe (OH) 2 And then oxidized:
2Fe(OH) 2 +1/2 O2=Fe2O3·H 2 O↓+H 2 O
B. feeding the slurry obtained in the step A into a spiral discharge sedimentation centrifuge for primary solid-liquid separation, enabling the separated liquid to enter a hydrated iron oxide storage tank, and enabling the separated solid to enter a filtering system through a pump; in a further preferred embodiment, when the hydrated ferric oxide slurry is sent to a spiral discharge decanter centrifuge for the first solid-liquid separation, the solid content in the separated liquid is controlled to be less than or equal to 5%, and the liquid content in the separated solid is controlled to be less than or equal to 30%.
C. B, sending the separated artificial rutile slurry in the step B into a first-stage belt type vacuum filter for secondary solid-liquid separation, transferring the separated liquid into a filtrate tank of the belt type filter, returning the separated liquid to serve as washing water of the first-stage belt type vacuum filter for recycling, transferring the redundant liquid into a rust recovery liquid tank through a pump, and returning the redundant liquid to the step A through the pump to serve as rust reaction raw materials for recycling; the separated solids enter a synthetic rutile slurry pulping tank, and industrial water is used as a water source of the slurry pulping tank;
and C, adding water into the solid of the slurry pulping tank after solid-liquid separation in the step for pulping, so as to ensure that the density of the slurry is 1.30-1.5g/ml.
D. C, feeding the slurry of the pulping tank into a second-stage belt type vacuum filter for third solid-liquid separation, and feeding the separated liquid into a filtering liquid pool of the belt type filter, wherein the washing water of the second-stage belt type vacuum filter adopts industrial water; the separated solid is artificial rutile wet material, and the artificial rutile wet material enters a pre-drying procedure through a belt conveyor;
in a further preferred embodiment, when the artificial rutile slurry in the step D is sent to the second-stage belt type vacuum filter for the third solid-liquid separation, the water content of the filter cake is controlled to be less than or equal to 15 percent, and the dry basis TiO is controlled 2 More than or equal to 87 percent and less than or equal to 6 percent of dry basis total iron.
E. D, enabling the artificial rutile wet material in the step D to enter a primary drying cylinder through a belt conveyor to be dehydrated and dried for the first time; and E, the drying heat source of the primary drying cylinder uses hot air exchanged by the waste heat recovery system to control the moisture of the drying material to be less than or equal to 5%.
F. E, the primary drying material in the step is fed into a secondary drying cylinder through a belt conveyor to be dehydrated and dried for the second time, and the synthetic rutile with the water reaching the standard is obtained, namely the obtained synthetic rutileTiO in rutile 2 The content reaches more than 87 percent.
In order to ensure that the adopted equipment is better matched and is beneficial to industrial production operation, the model of the spiral discharging decanter centrifuge is LW550 gamma 2350IV, and the diameter of the rotary drum is 550mm; the model of the belt type vacuum filter is DU25.2-1800, and the filtering area is 25.2m 2 The method comprises the steps of carrying out a first treatment on the surface of the The diameter of the primary drying cylinder is 3m, the length of the primary drying cylinder is 25m, and the diameter of the secondary drying cylinder is 2m, and the length of the secondary drying cylinder is 20m.
The first-stage belt type vacuum filter is arranged, so that the yield of separating the artificial rutile can be improved, namely more solids and more liquids can be separated in the first-stage belt type vacuum filter, and meanwhile, the hydrochloric acid, the iron oxide red and the like in the artificial rutile are washed by using water in a filter liquid pond of the belt filter;
industrial water is used in the slurry making tank, so that hydrochloric acid in more synthetic rutile can be washed away; the slurry pulping tank can improve the quality of the synthetic rutile, and industrial water is used for washing acid liquid such as hydrochloric acid in the synthetic rutile, so that the acid liquid is prevented from corroding drying equipment at the rear end;
the second-stage belt type vacuum filter is added with industrial water for washing in the filtering process, and more acidic liquid can be washed out in the process of conveying materials by a belt in the belt type filter; the residual hydrochloric acid and iron oxide red are washed, and the artificial rutile separated by the second-stage belt vacuum filter is controlled to be qualified, namely TiO in the artificial rutile 2 The content reaches more than 87 percent.
The primary drying cylinder and the secondary drying cylinder are arranged to save more energy, the heat of the primary drying is derived from the heat generated by reducing the tail gas of the rotary kiln in the waste heat recovery system, at least 400-500 ℃ of the heat is used for the primary drying; in the first drying process, parameters are not required to be controlled, the materials are required to be dried as much as possible, the moisture of the materials can be dried to be less than or equal to 5%, and the natural gas amount used in the second drying process is reduced, so that the aim of saving energy is fulfilled. Because the water content reaches about 15% when the material reaches the first drying cylinder. The first drying cylinder is in a structure of rotating and transporting, and a blower is used for blowing heat generated by the reduction rotary kiln into the drying cylinder to dry materials; and the second drying cylinder adopts a spray gun to spray natural gas into the drying cylinder for combustion to generate heat, so that the materials are dried.
Although the present invention has been described with reference to the foregoing embodiments, it will be apparent to those skilled in the art that modifications may be made to the embodiments described, or equivalents may be substituted for elements thereof, and any modifications, equivalents, improvements and changes may be made without departing from the spirit and principles of the present invention.
Claims (9)
1. The utility model provides a synthetic rutile separates drying system which characterized in that: comprises a rust groove, a spiral discharging sedimentation centrifuge, a first-stage belt vacuum filter, a slurry pulping groove, a second-stage belt vacuum filter, a first-stage drying cylinder and a second-stage drying cylinder which are sequentially arranged,
the rust tank is used for reducing ilmenite and rust liquid to generate electrochemical rust reaction, and the generated hydrated ferric oxide and synthetic rutile slurry are conveyed to a spiral discharge sedimentation centrifuge;
the spiral discharging sedimentation centrifuge is used for carrying out primary solid-liquid separation on the hydrated ferric oxide and the synthetic rutile slurry generated by the rust tank, and conveying the separated solids to the first-stage belt type vacuum filter through a pump;
the first-stage belt type vacuum filter is used for carrying out secondary solid-liquid separation on the separated solid slurry;
the slurry pulping tank is used for storing solid slurry generated after the first-stage belt type vacuum filter performs the second solid-liquid separation and conveying the solid slurry to the second-stage belt type vacuum filter,
carrying out third solid-liquid separation on solid slurry in a slurry making tank by a second-stage belt vacuum filter;
the first-stage drying cylinder and the second-stage drying cylinder are used for drying the solids separated by the second-stage belt type vacuum filter.
2. The synthetic rutile separation drying system according to claim 1, wherein:
the spiral discharging sedimentation centrifuge is also connected with a hydrated iron oxide storage tank, which is used for storing liquid materials after the spiral discharging sedimentation centrifuge carries out solid-liquid separation on the hydrated iron oxide and the synthetic rutile slurry for the first time;
the first-stage belt type vacuum filter is also connected with a filter liquid filtering tank which is used for storing liquid generated after the second solid-liquid separation of the first-stage belt type vacuum filter, and the liquid in the filter liquid filtering tank can be recycled to be used as washing water of the first-stage belt type vacuum filter;
the liquid in the filter liquid pool of the belt filter is transferred into the rust recovery liquid pool through a pump except the washing water provided for the first-stage belt type vacuum filter, and then is conveyed to the rust tank through the pump for recycling;
and the solid materials separated by the second-stage belt type vacuum filter are conveyed to a first-stage drying cylinder through a belt conveyor, and the first-stage drying cylinder is dried and then conveyed to a second-stage drying cylinder through the belt conveyor for secondary drying.
3. A synthetic rutile separation and drying method is characterized in that: the method comprises the following steps:
A. electrochemical corrosion reaction is carried out on the reduced ilmenite and the corrosion liquid in a corrosion tank to generate hydrated ferric oxide and synthetic rutile slurry;
B. feeding the slurry obtained in the step A into a spiral discharge sedimentation centrifuge for primary solid-liquid separation, enabling the separated liquid to enter a hydrated iron oxide storage tank, and enabling the separated solid to enter a filtering system through a pump;
C. b, sending the separated artificial rutile slurry in the step B into a first-stage belt type vacuum filter for secondary solid-liquid separation, transferring the separated liquid into a filtrate tank of the belt type filter, returning the separated liquid to serve as washing water of the first-stage belt type vacuum filter for recycling, transferring the redundant liquid into a rust recovery liquid tank through a pump, and returning the redundant liquid to the step A through the pump to serve as rust reaction raw materials for recycling; the separated solids enter a synthetic rutile slurry pulping tank, and industrial water is adopted as a pulping water source of the slurry pulping tank;
D. c, feeding the slurry of the pulping tank into a second-stage belt type vacuum filter for third solid-liquid separation, and feeding the separated liquid into a filtering liquid pool of the belt type filter, wherein the washing water of the second-stage belt type vacuum filter adopts industrial water; the separated solid is the artificial rutile wet material, which enters a pre-drying procedure through a belt conveyor;
E. d, enabling the artificial rutile wet material in the step D to enter a primary drying cylinder through a belt conveyor to be dehydrated and dried for the first time;
F. and E, feeding the primary drying material in the step E into a secondary drying cylinder through a belt conveyor to carry out secondary dehydration and drying, and obtaining the synthetic rutile with the moisture reaching the standard.
4. A synthetic rutile separation drying process according to claim 3, characterized in that: and (C) controlling the electrochemical corrosion reaction time in the step A to be 4-12 hours, configuring the concentration of ore pulp to 8% -13%, and configuring the iron content of ore bodies to be more than 10%, wherein the mass ratio of the corrosion liquid to the reduced ilmenite is 1.5-3:1.
5. A synthetic rutile separation drying process according to claim 3, characterized in that: and B, when the hydrated ferric oxide slurry is sent to a spiral discharge sedimentation centrifuge for primary solid-liquid separation, controlling the solid content in the separated liquid to be less than or equal to 5 percent and controlling the liquid content in the separated solid to be less than or equal to 30 percent.
6. A synthetic rutile separation drying process according to claim 3, characterized in that: and C, adding industrial water into the solid of the slurry pulping tank after solid-liquid separation in the step, and carrying out slurry mixing to ensure that the density of the slurry is 1.30-1.5g/ml.
7. A synthetic rutile separation drying process according to claim 3, characterized in that: the artificial rutile slurry in the step D is sent into a second-stage belt vacuum filter for third solid-liquidWhen separating, the water content of the filter cake is controlled to be less than or equal to 15 percent, and dry basis TiO is controlled 2 More than or equal to 87 percent and less than or equal to 6 percent of dry basis total iron.
8. A synthetic rutile separation drying process according to claim 3, characterized in that: and E, the drying heat source of the primary drying cylinder adopts hot air for heat exchange of a reduction rotary kiln tail gas waste heat recovery system, and the moisture of the drying material is controlled to be less than or equal to 5%.
9. A synthetic rutile separation drying process according to claim 3, characterized in that: and F, drying the material by adopting heat generated by natural gas combustion in a secondary drying cylinder to obtain TiO in the synthetic rutile 2 The content reaches more than 87 percent.
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| US5601630A (en) * | 1993-02-23 | 1997-02-11 | The Commonweath Industrial Gases Limited | Process for the production of synthetic rutile |
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