CN114573023A - Recycling method and system of oversize titanium dioxide base material - Google Patents
Recycling method and system of oversize titanium dioxide base material Download PDFInfo
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- CN114573023A CN114573023A CN202210336725.2A CN202210336725A CN114573023A CN 114573023 A CN114573023 A CN 114573023A CN 202210336725 A CN202210336725 A CN 202210336725A CN 114573023 A CN114573023 A CN 114573023A
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- oversize
- base material
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- titanium dioxide
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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
- C01G23/07—Producing by vapour phase processes, e.g. halide oxidation
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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
- C01G23/08—Drying; Calcining ; After treatment of titanium oxide
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B17/00—Furnaces of a kind not covered by any preceding group
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
- F27D7/02—Supplying steam, vapour, gases, or liquids
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- 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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- Life Sciences & Earth Sciences (AREA)
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- Inorganic Chemistry (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Inorganic Compounds Of Heavy Metals (AREA)
Abstract
The invention discloses a method and a system for recycling oversize products of a titanium dioxide base material, which comprises the following steps of 1: cooling the titanium dioxide material generated in the oxidation furnace, and then sending the titanium dioxide material into a bag filter for filtering to obtain chlorine, solid slag and scar removing sand; step 2: feeding chlorine gas into a chlorination furnace for tail gas treatment, feeding solid slag into a pulping material tank for pulping, washing and drying the scar-removing sand, and returning the scar-removing sand to an oxidation furnace for later use; and 3, step 3: vibrating and screening the slurry obtained after pulping to obtain an oversize product and a undersize product of the titanium white base material; and 4, step 4: drying oversize titanium dioxide base material, mixing with scar-removing sand, and removing scar in an oxidation furnace; and 5: and post-treating the undersize product of the titanium white base material to produce a titanium white powder finished product. The invention reasonably improves the prior art, the oversize material of the titanium dioxide base material is used as the scar removing material and the scar removing sand to remove the scar cooperatively, the oversize material of the titanium dioxide base material is utilized, the material consumption of the scar removing sand can be reduced, and the effects of material recycling, resource saving, cost reduction and efficiency improvement are achieved.
Description
Technical Field
The invention belongs to the technical field of titanium dioxide production, and particularly relates to a method for recovering oversize products of a titanium dioxide base material and applying the oversize products to a scar removing system of an oxidation reactor.
Background
The method for producing titanium dioxide by chlorination process has the advantages of short process flow, high yield, high automation degree, small pollution and the like, is an ideal method for producing rutile titanium dioxide, and makes the boiling chlorination process become a trend leading future development. The purpose of the post-treatment section is mainly: the qualified titanium dioxide finished product is produced by the processes of neutralization treatment, sanding treatment, coating treatment, slurry filter pressing, flash drying, airflow crushing, packaging and the like of the titanium dioxide base material. The titanium white base material is in the neutralization groove and before entering the sand mill, large-particle caking oversize products are screened out through a vibrating screen. Then the heated refined titanium tetrachloride reacts with the heated oxygen to prepare titanium dioxide base material, the washed titanium dioxide base material slurry without sand is sent to post-treatment through cooling, separation, pulping and sand washing, and the washed scar-removing sand is dried, screened and reused.
The problem of furnace scaling in the production of titanium dioxide base stock is due to nascent aerosol TiO with large surface area and viscosity2The fine particles and the wadding staying in the high-temperature area are gradually sintered to form hard scar blocks, and the scar changes the space shape of the oxidation furnace, blocks a feed inlet, influences the air flow direction, so that the furnace is often forced to be shut down for treatment. Removing scar layer in the reactor in time is one of the core problems in developing titanium white production technology by chlorination process. TiCl related to China and abroad4The scar removing technology of the gas phase oxidation reactor has various forms and means. The scar removing method of the oxidation reactor is mainly composed of sand blasting scar removing, high-voltage static scar removing, mechanical vibration scar removing, ultrasonic vibration scar removing, porous wall scar removing, material curtain and air curtain scar removing, sand blasting ultrasonic scar removing and the like.
At present, taking a titanium chloride white production line of 10kt/a as an example, about 330t of oversize products can be generated every year, and due to the fact that the particle size is large and hard, the processing method in the current production is mainly stacking and storing, resource waste is caused, and the storage space is occupied.
Therefore, there is a need to develop a new method for treating oversize products of titanium white base material, which can realize the recycling of materials and reduce the production cost.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for recycling oversize materials of a titanium dioxide base material, which aims to: drying the oversize product of the titanium white base material, then proportioning the dried oversize product and the scar removing sand, sending the mixture into an oxidation furnace for removing scars, reducing the stockpiling of the oversize product of the titanium white base material, recovering the material and reducing the using amount of the scar removing sand.
The technical scheme adopted by the invention is as follows:
a method for recycling oversize materials of titanium white base materials comprises the following steps:
step 1: cooling the titanium dioxide material generated in the oxidation furnace, and then sending the titanium dioxide material into a bag filter for filtering to obtain chlorine, solid slag and scar removing sand;
step 2: feeding chlorine gas into a chlorination furnace for tail gas treatment, feeding solid slag into a pulping material tank for pulping, washing and drying the scar-removing sand, and returning the scar-removing sand to an oxidation furnace for later use;
and step 3: vibrating and screening the slurry obtained after pulping in the pulping tank to obtain oversize titanium white base material and undersize titanium white base material;
and 4, step 4: drying oversize titanium white base material, mixing the dried oversize titanium white base material with the scar removing sand obtained in the step 2 in proportion, and using the mixture in an oxidation furnace for removing scars;
and 5: and (4) after the undersize product of the titanium white base material enters a neutralization tank, performing post-treatment to produce a titanium white finished product.
After the technical scheme is adopted, the invention reasonably improves the prior art, and the oversize material of the titanium white base material is used as the scar removing material and the scar removing sand for removing scars cooperatively under certain condition treatment, so that the oversize material of the titanium white base material is utilized, the material consumption of the scar removing sand can be reduced, and the effects of material recycling, resource saving, cost reduction and efficiency improvement are achieved.
Further, the concentration of the slurry subjected to vibratory screening in the step 3 is 550-650 g/L.
After the optimized scheme is adopted, the slurry at the concentration has moderate viscosity, good fluidity and better screening effect, and the subsequent coating effect is ensured.
Further, the oversize TiO of the titanium white base material obtained in the step 32The grade is more than 96 percent.
After the optimal selection scheme is adopted, a large amount of impurities brought in can be avoided to enter a system to pollute the slurry, and the quality of finished products is ensured.
Furthermore, the water content of the oversize product of the titanium dioxide base material is less than 0.5 percent.
After the optimized scheme is adopted, excessive moisture can be prevented from being brought into the oxidation process, and the normal operation of the oxidation furnace is ensured.
Further, in the step 4, the mixing ratio of the oversize product of the titanium white base material to the scar removing sand is 1: 9-2: 8.
after adopting this preferred scheme, use according to this proportion ratio and can guarantee not influencing the effect of scaring of pipeline, can guarantee again that most base material oversize thing large granule can be broken open, reduces the load of follow-up screening, promotes the recovery efficiency of base material oversize thing.
Furthermore, the oversize product of the titanium white base material comprises agglomerated large granular materials of titanium dioxide in the production process of titanium white.
After the preferred scheme is adopted, not only can the oversize materials of the waste base materials be recycled, the resource waste be reduced, but also the amount of the scar-removing sand can be reduced, the cost can be reduced, and the effect can be improved.
The invention also provides a recycling system of oversize products of the titanium white base material, which comprises the AlCl connected in sequence3Generator, oxidation furnace, cooling tube, bag filter, making beating material jar and shale shaker, the air inlet of oxidation furnace is connected with oxygen supply device, the bag filter still is connected with scar removing sand washing drying device, scar removing sand washing drying device's discharge gate is connected with the oxidation furnace, the tail gas exit linkage of bag filter has chlorination furnace, the oversize thing discharge end of shale shaker is connected with the desicator, the discharge gate and the oxidation furnace of desicator are connected, the undersize thing discharge end of shale shaker is connected with neutralization groove, neutralization groove is connected with aftertreatment device.
Furthermore, an oxygen preheating device is arranged on a pipeline between the oxygen supply device and the oxidation furnace.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the invention reasonably improves the prior art, and the oversize product of the titanium white base material is used as a scar removing material and scar removing sand for removing scars cooperatively under certain condition treatment, thereby not only utilizing the oversize product of the titanium white base material, but also reducing the material consumption of the scar removing sand, and achieving the effects of material recycling, resource saving, cost reduction and efficiency improvement.
2. The concentration of the slurry is 550-650g/L, the viscosity of the slurry is moderate under the concentration, the fluidity is good, the screening effect is good, and the subsequent coating effect is ensured.
3. Titanium dioxide base material oversize material TiO2The grade is more than 96 percent, so that a large amount of impurities brought in can be avoided to enter the system to pollute the slurry, and the quality of finished products is ensured.
4. The water content of the oversize product of the titanium dioxide base material is less than 0.5 percent, so that excessive water can be prevented from being brought into an oxidation procedure, and the normal operation of the oxidation furnace is ensured.
5. The mixing ratio of oversize titanium white base material to scar removing sand is 1: 9-2: 8, can guarantee not to influence the effect of scaring of pipeline, can guarantee again that most base material oversize thing large granule can be broken open, reduce the load of follow-up screening, promote the recovery efficiency of base material oversize thing.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a process flow diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, as presented in the figures, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are usually placed in when used, and are only used for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
The present invention will be described in detail with reference to fig. 1.
A method for recycling oversize products of titanium white base materials is shown in a process flow diagram in figure 1 and comprises the following steps:
step 1: preheating refined titanium tetrachloride, introducing the preheated refined titanium tetrachloride, the kCl and Al powder into an AlCl3 generator, then introducing into an oxidation furnace, carrying out oxidation reaction on titanium tetrachloride and oxygen in the oxidation furnace to generate a titanium white material, cooling the titanium white material, and then conveying the cooled titanium white material into a bag filter for filtering to obtain chlorine, solid slag and scar-removing sand;
step 2: feeding chlorine gas into a chlorination furnace for tail gas treatment, feeding solid slag into a pulping material tank for pulping, washing and drying the scar-removing sand, and returning the scar-removing sand to an oxidation furnace for later use;
and step 3: vibrating and screening the slurry (with the concentration of 550-650g/L) obtained after pulping in the pulping tank to obtain an oversize product (the grade of TiO2 is more than 96 percent and the water content is less than 0.5 percent) of the titanium dioxide base material and an undersize product of the titanium dioxide base material;
and 4, step 4: drying the titanium dioxide base material oversize TiO2 caking material, returning to an oxidation furnace for standby use, wherein the water content is required to be less than 0.5%, and mixing with the scar removing sand obtained in the step 2 according to the weight ratio of 1: 9-2: 8 is used for removing scars of an oxidation furnace after being mixed according to the proportion;
and 5: after entering a neutralization tank, the undersize of the titanium white base material is sequentially subjected to sanding, coating and gas powder treatment, and finally the finished product of the titanium white powder is obtained.
The invention also provides a recycling system of oversize products of titanium white base materials, which comprises AlCl connected in sequence as shown in figure 13Generator, oxidation furnace, cooling tube, bag filter, making beating material jar and shale shaker, the air inlet of oxidation furnace is connected with oxygen supply device, the bag filter still is connected with scar removing sand washing drying device, scar removing sand washing drying device's discharge gate is connected with the oxidation furnace, the tail gas exit linkage of bag filter has chlorination furnace, the oversize thing discharge end of shale shaker is connected with the desicator, the discharge gate and the oxidation furnace of desicator are connected, the undersize thing discharge end of shale shaker is connected with neutralization groove, neutralization groove is connected with aftertreatment device. The post-processing device packageThe method comprises a sanding device, a film coating device and a gas powder device, wherein undersize materials are treated by a post-treatment device to obtain a titanium dioxide finished product.
Furthermore, an oxygen preheating device is arranged on a pipeline between the oxygen supply device and the oxidation furnace, so that oxygen can be preheated, and the reaction efficiency in the oxidation furnace is improved.
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.
Claims (8)
1. A method for recycling oversize materials of titanium white base materials is characterized by comprising the following steps:
step 1: cooling the titanium dioxide material generated in the oxidation furnace, and then sending the titanium dioxide material into a bag filter for filtering to obtain chlorine, solid slag and scar removing sand;
step 2: feeding chlorine gas into a chlorination furnace for tail gas treatment, feeding solid slag into a pulping material tank for pulping, washing and drying the scar-removing sand, and returning the scar-removing sand to an oxidation furnace for later use;
and step 3: vibrating and screening the slurry obtained after pulping in the pulping tank to obtain oversize titanium white base material and undersize titanium white base material;
and 4, step 4: drying oversize titanium white base material, mixing the dried oversize titanium white base material with the scar removing sand obtained in the step 2 in proportion, and using the mixture in an oxidation furnace for removing scars;
and 5: and (4) after the undersize product of the titanium white base material enters a neutralization tank, performing post-treatment to produce a titanium white finished product.
2. The method for recycling oversize materials of titanium white base materials according to claim 1, characterized in that: the concentration of the slurry subjected to vibration screening in the step 3 is 550-650 g/L.
3. The titanium white base material according to claim 1The method for recycling oversize materials is characterized by comprising the following steps: titanium dioxide base material oversize TiO obtained in step 32The grade is more than 96 percent.
4. The method for recycling oversize materials of titanium white base materials according to claim 1, characterized in that: the water content of the oversize product of the titanium dioxide base material is less than 0.5 percent.
5. The method for recycling oversize materials of titanium white base materials according to claim 1, characterized in that: in the step 4, the mixing ratio of oversize titanium white base material to scar removing sand is 1: 9-2: 8.
6. the method for recycling oversize materials of titanium white base materials according to claim 1, characterized in that: the oversize product of the titanium dioxide base material comprises a caking material of titanium dioxide in the production process of titanium dioxide.
7. A system for realizing the recycling method of the oversize product of the titanium white base material as set forth in any one of claims 1 to 6, which is characterized in that: comprises AlCl connected in sequence3Generator, oxidation furnace, cooling tube, bag filter, making beating material jar and shale shaker, the air inlet of oxidation furnace is connected with oxygen supply device, the bag filter still is connected with scar removing sand washing drying device, scar removing sand washing drying device's discharge gate is connected with the oxidation furnace, the tail gas exit linkage of bag filter has chlorination furnace, the oversize thing discharge end of shale shaker is connected with the desicator, the discharge gate and the oxidation furnace of desicator are connected, the undersize thing discharge end of shale shaker is connected with neutralization groove, neutralization groove is connected with aftertreatment device.
8. The system for recycling oversize titanium dioxide base material according to claim 7, characterized in that: an oxygen preheating device is arranged on a pipeline between the oxygen supply device and the oxidation furnace.
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| CN202210336725.2A CN114573023A (en) | 2022-03-31 | 2022-03-31 | Recycling method and system of oversize titanium dioxide base material |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1066043A (en) * | 1991-12-27 | 1992-11-11 | 天津化工厂 | Rutile-type titanium dioxide powder prepared by plasma chlorination process |
| CN103663550A (en) * | 2013-12-09 | 2014-03-26 | 云南新立有色金属有限公司 | Preparation method of titanium dioxide |
| CN107697949A (en) * | 2017-11-13 | 2018-02-16 | 龙蟒佰利联集团股份有限公司 | A kind of sulfuric acid process falls kiln product and is used for the production process of titanium pigment that chloridising removes scar sand |
| CN213375747U (en) * | 2020-08-04 | 2021-06-08 | 河南佰利联新材料有限公司 | Device for collecting titanium white base material by chlorination process by dry method |
-
2022
- 2022-03-31 CN CN202210336725.2A patent/CN114573023A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1066043A (en) * | 1991-12-27 | 1992-11-11 | 天津化工厂 | Rutile-type titanium dioxide powder prepared by plasma chlorination process |
| CN103663550A (en) * | 2013-12-09 | 2014-03-26 | 云南新立有色金属有限公司 | Preparation method of titanium dioxide |
| CN107697949A (en) * | 2017-11-13 | 2018-02-16 | 龙蟒佰利联集团股份有限公司 | A kind of sulfuric acid process falls kiln product and is used for the production process of titanium pigment that chloridising removes scar sand |
| CN213375747U (en) * | 2020-08-04 | 2021-06-08 | 河南佰利联新材料有限公司 | Device for collecting titanium white base material by chlorination process by dry method |
Non-Patent Citations (2)
| Title |
|---|
| 李建军;刘建良;史勤恺;: "氯化法钛白粉工业化生产三废处理与利用", 云南冶金, no. 02, pages 59 * |
| 王贻谦, 刘长河, 孙元智: "氯化法钛白引进设备运行及国产化", 钛工业进展, no. 06 * |
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