CN108892179B - Method for green treatment of titanium tetrachloride dust collecting slag - Google Patents
Method for green treatment of titanium tetrachloride dust collecting slag Download PDFInfo
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- CN108892179B CN108892179B CN201810926108.1A CN201810926108A CN108892179B CN 108892179 B CN108892179 B CN 108892179B CN 201810926108 A CN201810926108 A CN 201810926108A CN 108892179 B CN108892179 B CN 108892179B
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- titanium tetrachloride
- slag
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- 239000002893 slag Substances 0.000 title claims abstract description 47
- 239000000428 dust Substances 0.000 title claims abstract description 46
- XJDNKRIXUMDJCW-UHFFFAOYSA-J titanium tetrachloride Chemical compound Cl[Ti](Cl)(Cl)Cl XJDNKRIXUMDJCW-UHFFFAOYSA-J 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 18
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000000706 filtrate Substances 0.000 claims abstract description 28
- 239000000843 powder Substances 0.000 claims abstract description 19
- RTAQQCXQSZGOHL-UHFFFAOYSA-N Titanium Chemical compound [Ti] RTAQQCXQSZGOHL-UHFFFAOYSA-N 0.000 claims abstract description 17
- 239000010936 titanium Substances 0.000 claims abstract description 17
- 229910052719 titanium Inorganic materials 0.000 claims abstract description 17
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000002002 slurry Substances 0.000 claims abstract description 10
- 239000007921 spray Substances 0.000 claims abstract description 10
- 238000010521 absorption reaction Methods 0.000 claims abstract description 9
- 239000002006 petroleum coke Substances 0.000 claims abstract description 9
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 claims abstract description 8
- 238000003825 pressing Methods 0.000 claims abstract description 7
- 238000001914 filtration Methods 0.000 claims abstract description 6
- 238000004806 packaging method and process Methods 0.000 claims abstract description 5
- 238000001816 cooling Methods 0.000 claims abstract description 4
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 abstract description 7
- 238000003912 environmental pollution Methods 0.000 abstract description 4
- 238000009825 accumulation Methods 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 238000004064 recycling Methods 0.000 abstract 1
- 239000007789 gas Substances 0.000 description 38
- 239000002253 acid Substances 0.000 description 8
- 238000005660 chlorination reaction Methods 0.000 description 6
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 6
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 6
- 238000011084 recovery Methods 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- 229910001510 metal chloride Inorganic materials 0.000 description 5
- 239000007787 solid Substances 0.000 description 5
- 239000003595 mist Substances 0.000 description 4
- 238000005086 pumping Methods 0.000 description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N titanium dioxide Inorganic materials O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 description 4
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 description 4
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 3
- 235000011941 Tilia x europaea Nutrition 0.000 description 3
- 239000004571 lime Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000000926 separation method Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 239000001110 calcium chloride Substances 0.000 description 2
- 229910001628 calcium chloride Inorganic materials 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 239000008267 milk Substances 0.000 description 2
- 210000004080 milk Anatomy 0.000 description 2
- 235000013336 milk Nutrition 0.000 description 2
- 238000004537 pulping Methods 0.000 description 2
- 239000013049 sediment Substances 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- UXVMQQNJUSDDNG-UHFFFAOYSA-L Calcium chloride Chemical compound [Cl-].[Cl-].[Ca+2] UXVMQQNJUSDDNG-UHFFFAOYSA-L 0.000 description 1
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 1
- 239000004480 active ingredient Substances 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 239000000460 chlorine Substances 0.000 description 1
- 229910052801 chlorine Inorganic materials 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 235000013312 flour Nutrition 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229910000000 metal hydroxide Inorganic materials 0.000 description 1
- 150000004692 metal hydroxides Chemical class 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000002910 solid waste Substances 0.000 description 1
- 239000002352 surface water Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G49/00—Compounds of iron
- C01G49/02—Oxides; Hydroxides
- C01G49/06—Ferric oxide [Fe2O3]
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B32/00—Carbon; Compounds thereof
- C01B32/05—Preparation or purification of carbon not covered by groups C01B32/15, C01B32/20, C01B32/25, C01B32/30
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B7/00—Halogens; Halogen acids
- C01B7/01—Chlorine; Hydrogen chloride
- C01B7/03—Preparation from chlorides
- C01B7/035—Preparation of hydrogen chloride from chlorides
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B34/00—Obtaining refractory metals
- C22B34/10—Obtaining titanium, zirconium or hafnium
- C22B34/12—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08
- C22B34/1204—Obtaining titanium or titanium compounds from ores or scrap by metallurgical processing; preparation of titanium compounds from other titanium compounds see C01G23/00 - C01G23/08 preliminary treatment of ores or scrap to eliminate non- titanium constituents, e.g. iron, without attacking the titanium constituent
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/005—Separation by a physical processing technique only, e.g. by mechanical breaking
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Environmental & Geological Engineering (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Inorganic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Mechanical Engineering (AREA)
- Metallurgy (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The invention belongs to the technical field of titanium tetrachloride production, and discloses a method for green treatment of titanium tetrachloride dust collecting slag, which comprises the following steps: a. dissolving titanium tetrachloride dust collection slag in a hydrochloric acid solution to obtain slurry; b. carrying out filter pressing on the slurry in the step a, and separating to obtain filter residue and filtrate; c. c, jointly reselecting the filter residue obtained in the step b by adopting a multi-stage shaking table, and separating to obtain petroleum coke and titanium slag; d. c, filtering and concentrating the filtrate obtained in the step b, and then carrying out spray roasting in a roasting furnace to obtain Fe2O3Powder and furnace gas containing HCl; e. d, cooling the furnace gas in the step d to below 100 ℃ after the furnace gas is dedusted by a cyclone dust collector, absorbing the furnace gas in an absorption tower by water to form a hydrochloric acid solution, and returning the hydrochloric acid solution to the step a for use; fe2O3And packaging the powder for sale. The method has reasonable steps for treating the titanium tetrachloride dust collecting slag, can realize the full recycling of effective components in the dust collecting slag, and solves the problem of environmental pollution caused by chloride accumulation.
Description
Technical Field
The invention belongs to the technical field of titanium tetrachloride production, and particularly relates to a method for green treatment of titanium tetrachloride dust-collecting slag.
Background
In the process of producing titanium tetrachloride by boiling chlorination, petroleum coke and titanium-rich materials (high titanium slag/rutile) which are solid components are mainly added from the middle part of a chlorination furnace, liquid chlorine is gasified and then fed into the chlorination furnace from the bottom to form a fluidized bed, and chlorination reaction is carried out among the materials to generate crude titanium tetrachloride gas. And discharging a part of petroleum coke with smaller particle size and high titanium slag/rutile together with titanium tetrachloride gas from the top of the chlorination furnace, and introducing the petroleum coke and the high titanium slag/rutile into a cyclone dust collector for gas-solid separation. TiO in high titanium slag/rutile2When the titanium tetrachloride is chloridized into titanium tetrachloride, other metal oxides in the titanium tetrachloride can be chloridized into corresponding metal chlorides, and the metal chlorides enter solid dust collecting slag after most of the titanium tetrachloride enters a cyclone dust collector along with titanium tetrachloride gas and is condensed.
Every 1 ton of titanium tetrachloride produced, 0.25t of dust-collecting slag will be produced. The dust collecting slag contains petroleum coke and high titanium slag/rutile which can reach 50 to 70 percent, the rest components are mainly metal chloride, an effective treatment method for the titanium tetrachloride dust collecting slag is lacked in the prior art, most enterprises adopt a method of landfill or accumulation after lime neutralization and solidification to treat the titanium tetrachloride dust collecting slag, and resource waste and environmental pollution are caused.
The metal chloride in the dust collection slag is dissolved in a large amount when meeting water, the content of chloride ions in the water solution can reach more than 100mg/L, which seriously exceeds the requirement on the content of chloride ions in the sewage discharge standard in China, and the metal chloride cannot be directly discharged, so that underground water, surface water systems and soil can be polluted by the direct discharge, and the environment pollution is caused. Therefore, the chlorination residue is treated by adopting water-soluble filtration and directly injecting filtrate into 1600m underground, and the potential hazard of environmental pollution is caused. Lime milk is adopted for solidification and then is piled and buried: adding acid water into waste residues for pulping, then carrying out filter pressing, and stacking and taking out filter residues (called inert residues) or carrying out coke and ore separation from the inert residues; neutralizing the filtrate with lime milk, and filter-pressing to obtain solid metal hydroxide and CaCl2Treatment of solutions, solid slag dumps, CaCl2The solution is evaporated and concentrated to obtain anhydrous calcium chloride. However, the process flow is complicated, solid waste accumulation occupies a large amount of field, and harmless treatment of resources is not completely realized. Therefore, a new efficient and environment-friendly process is still needed to realize comprehensive utilization of resources.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a method for green treatment of titanium tetrachloride dust-collecting slag. Through setting up reasonable technology and handling titanium tetrachloride dust collection sediment, can realize the abundant recycle of active ingredient in the dust collection sediment, realize the optimization of resource to the environmental pollution that the chloride piles up and causes groundwater and soil has been solved.
The invention provides a method for green treatment of titanium tetrachloride dust-collecting slag, which comprises the following steps:
a. dissolving titanium tetrachloride dust collection slag in a hydrochloric acid solution to obtain slurry;
b. carrying out filter pressing on the slurry in the step a, and separating to obtain filter residue and filtrate;
c. c, jointly reselecting the filter residue obtained in the step b by adopting a multi-stage shaking table, and separating to obtain petroleum coke and titanium slag;
d. c, filtering and concentrating the filtrate obtained in the step b, and then carrying out spray roasting in a roasting furnace to obtain Fe2O3Powder and furnace gas containing HCl;
e. d, cooling the furnace gas in the step d to below 100 ℃ after the furnace gas is dedusted by a cyclone dust collector, absorbing the furnace gas in an absorption tower by water to form a hydrochloric acid solution, and returning the hydrochloric acid solution to the step a for use; fe2O3And packaging the powder for sale.
Preferably, in the step a, the mass fraction of the hydrochloric acid solution is 2-4%.
Further preferably, in the step a, the mass ratio of the hydrochloric acid solution to the titanium tetrachloride dust collecting slag is 3: 1-6: 1. The material ratio can be adopted to completely dissolve the chloride in the titanium tetrachloride dust-collecting slag.
In the invention, the filter residue is treated by combined gravity separation of the multistage shaking table, the specific process steps can be selected according to the prior art, the recovery rate of the titanium slag in the filter residue can reach 34 percent by adopting the treatment mode, and the TiO in the obtained titanium slag2The grade is about 90%.
Preferably, the filtrate filtered in the step d exchanges heat with the furnace gas subjected to dust removal in the step e, and meanwhile, the concentration of the filtrate and the temperature reduction of the furnace gas are realized.
Specifically, the filtrate is firstly pumped into a separator at the lower part of a Venturi, is filtered and then exchanges heat with furnace gas subjected to dust removal by a cyclone dust collector, is then pumped into the top of a roasting furnace, forms spray by an acid spray gun, and is heated by high-temperature gas from bottom to top sent by a burner in the roasting furnace in the descending process to be converted into Fe2O3Powder and furnace gas containing HCl gas.
Preferably, the filtered filtrate is concentrated to a relative density of 1.2-1.5, more preferably 1.3.
Preferably, the firing temperature in the firing furnace is 550-.
According to the invention, Fe is produced in step d2O3Most of the powder is sunk through the furnace bottom and enters a storage bin, and a small part of the powder is returned to the furnace after being sunk through a cyclone dust collector and then enters the storage binFe in (1)2O3Taking out after the flour is packaged; and d, enabling the furnace gas obtained in the step d to enter a cyclone dust collector through the furnace top to remove dust, enabling the furnace gas to exchange heat with the filtered filtrate through a Venturi so that the temperature of the furnace gas reaches below 100 ℃, enabling the gas to enter an absorption tower, enabling the gas to be absorbed by water in the absorption tower to form a hydrochloric acid solution, enabling the recovery rate of the hydrochloric acid to reach above 80%, and returning the hydrochloric acid solution to the step a for use.
The parameters not defined in the present invention can be selected conventionally in the art so that the method of the present invention can be carried out.
The invention directly carries out spray roasting on the filtrate to obtain Fe2O3The powder and the gas containing hydrogen chloride, the hydrogen chloride gas is absorbed to form hydrochloric acid which can be recycled to the pulping process, the cyclic utilization of resources is realized, the pollution to a water system and soil is reduced by recovering chlorine, and Fe2O3The powder can be directly sold, and the purposes of high efficiency, energy conservation, environmental harmlessness and reasonable resource utilization of the titanium tetrachloride dust collecting slag are realized.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments.
Example 1
This example is intended to illustrate the green treatment of titanium tetrachloride dust-collecting slag according to the invention, which comprises the following steps:
a. dissolving titanium tetrachloride dust collecting slag in a hydrochloric acid solution with the mass fraction of 3%, wherein the mass ratio of the hydrochloric acid solution to the titanium tetrachloride dust collecting slag is 5: 1, so that chloride in the titanium tetrachloride dust collecting slag is completely dissolved to obtain slurry;
b. carrying out filter pressing on the slurry in the step a, and separating to obtain filter residue and filtrate;
c. c, jointly reselecting the filter residue obtained in the step b by adopting a multi-stage shaking table, and separating to obtain petroleum coke and titanium slag; the recovery rate of titanium slag in the filter residue reaches 34 percent, and TiO in the obtained titanium slag2The grade is about 90 percent;
d. step (ii) ofb, pumping the obtained filtrate into a separator at the lower part of a Venturi for filtering, carrying out heat exchange on the filtered filtrate and furnace gas subjected to dust removal by a cyclone dust collector, concentrating the filtrate until the relative density is 1.3, pumping the filtrate into the top of a roasting furnace, forming spray by an acid spray gun, heating acid mist by high-temperature gas from bottom to top sent by a burner in the roasting furnace in the descending process, wherein the roasting temperature in the roasting furnace is 600 ℃, and converting the acid mist into Fe2O3Powder and furnace gas containing HCl gas;
e. d, enabling the furnace gas obtained in the step d to enter a cyclone dust collector through the furnace top to remove dust, enabling the furnace gas to exchange heat with the filtered filtrate through a Venturi so that the temperature of the furnace gas reaches below 100 ℃, enabling the gas to enter an absorption tower, enabling the gas to be absorbed by water in the absorption tower to form a hydrochloric acid solution, enabling the recovery rate of the hydrochloric acid to reach 86%, and returning the hydrochloric acid solution to the step a for use; fe produced in step d2O3Most of the powder enters a storage bin after sinking at the bottom of the furnace, and a small part of the powder returns to the furnace after sinking through a cyclone dust collector, and Fe in the storage bin2O3And packaging the powder for sale.
Example 2
This example is intended to illustrate the green treatment of titanium tetrachloride dust-collecting slag according to the invention, which comprises the following steps:
a. dissolving titanium tetrachloride dust collecting slag in a hydrochloric acid solution with the mass fraction of 4%, wherein the mass ratio of the hydrochloric acid solution to the titanium tetrachloride dust collecting slag is 4: 1, so that chloride in the titanium tetrachloride dust collecting slag is completely dissolved to obtain slurry;
b. carrying out filter pressing on the slurry in the step a, and separating to obtain filter residue and filtrate;
c. c, jointly reselecting the filter residue obtained in the step b by adopting a multi-stage shaking table, and separating to obtain petroleum coke and titanium slag; the recovery rate of titanium slag in the filter residue reaches 34 percent, and TiO in the obtained titanium slag2The grade is about 90 percent;
d. pumping the filtrate obtained in the step b into a separator at the lower part of a Venturi for filtering, carrying out heat exchange on the filtered filtrate and furnace gas subjected to dust removal by a cyclone dust collector, concentrating until the relative density is 1.5, pumping the filtrate into the top of the roasting furnace, and forming spray by an acid spray gun, wherein the acid mist is formed in the descending processIs heated by high-temperature gas from bottom to top sent by a burner in a roasting furnace, the roasting temperature in the roasting furnace is 630 ℃, and acid mist is converted into Fe2O3Powder and furnace gas containing HCl gas;
e. d, enabling the furnace gas obtained in the step d to enter a cyclone dust collector through the furnace top to remove dust, enabling the furnace gas to exchange heat with the filtered filtrate through a Venturi so that the temperature of the furnace gas reaches below 100 ℃, enabling the gas to enter an absorption tower, enabling the gas to be absorbed by water in the absorption tower to form a hydrochloric acid solution, enabling the recovery rate of the hydrochloric acid to reach 85%, and returning the hydrochloric acid solution to the step a for use; fe produced in step d2O3Most of the powder enters a storage bin after sinking at the bottom of the furnace, and a small part of the powder returns to the furnace after sinking through a cyclone dust collector, and Fe in the storage bin2O3And packaging the powder for sale.
Having described embodiments of the present invention, the foregoing description is intended to be exemplary, not exhaustive, and not limited to the disclosed embodiments. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the illustrated embodiments.
Claims (1)
1. The method for green treatment of the titanium tetrachloride dust-collecting slag is characterized by comprising the following steps:
a. dissolving titanium tetrachloride dust collection slag in a hydrochloric acid solution to obtain slurry;
b. carrying out filter pressing on the slurry in the step a, and separating to obtain filter residue and filtrate;
c. c, jointly reselecting the filter residue obtained in the step b by adopting a multi-stage shaking table, and separating to obtain petroleum coke and titanium slag;
d. c, filtering and concentrating the filtrate obtained in the step b, and then carrying out spray roasting in a roasting furnace to obtain Fe2O3Powder and furnace gas containing HCl;
e. d, cooling the furnace gas in the step d to below 100 ℃ after the furnace gas is dedusted by a cyclone dust collector, absorbing the furnace gas in an absorption tower by water to form a hydrochloric acid solution, and returning the hydrochloric acid solution to the step a for use; fe2O3Packaging the powder for sale;
in the step a, the mass fraction of the hydrochloric acid solution is 2-4%, and the mass ratio of the hydrochloric acid solution to the titanium tetrachloride dust collecting slag is 3: 1-6: 1;
d, exchanging heat between the filtrate filtered in the step d and the furnace gas subjected to dust removal in the step e, and simultaneously concentrating the filtrate and cooling the furnace gas;
concentrating the filtered filtrate to relative density of 1.2-1.5;
the baking temperature in the baking furnace is 550-630 ℃.
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| CN113634357B (en) * | 2021-08-23 | 2024-02-13 | 云南国钛金属股份有限公司 | Recovery method of titanium tetrachloride dust collection slag |
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| CN106745308A (en) * | 2016-12-14 | 2017-05-31 | 攀枝花钢企欣宇化工有限公司 | The recovery and treatment method of titanium tetrachloride dust-slag collection |
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