CN115325816B - High-purity titanium dioxide production equipment and process thereof - Google Patents

Abstract

The invention provides high-purity titanium dioxide production equipment and a process thereof in the technical field of titanium dioxide preparation, wherein the high-purity titanium dioxide production equipment comprises a rotary kiln assembly, and the rotary kiln assembly comprises a dehydration calcination area, a desulfurization calcination area and a transformation calcination area; characterized by further comprising: a feeding assembly for feeding hydrated titanium dioxide into the rotary kiln assembly, the feeding assembly being disposed at one end of a kiln tail of the rotary kiln assembly; the air extraction assembly is used for extracting dehydrated and desulfurized gas to carry out isolated heat supply on the hydrated titanium dioxide conveyed by the feeding assembly, and is arranged on the rotary kiln assembly; and the cleaning component is used for rolling the titanium dioxide along the rotary conveying direction of the rotary kiln component and rotationally separating the sintered material, and is arranged in the rotary kiln component. The method has the advantages of isolating preheated input materials, rapidly removing sintered particles and the like during the calcination of the hydrated titanium dioxide.

Description

High-purity titanium dioxide production equipment and process thereof

Technical Field

The invention relates to the technical field of titanium dioxide preparation, in particular to high-purity titanium dioxide production equipment and a process thereof.

Background

When titanium dioxide is prepared by a sulfuric acid method, acidolysis of titanium-containing minerals by sulfuric acid to obtain titanyl sulfate solution, purifying and hydrolyzing to obtain metatitanic acid precipitate, and roasting in a rotary kiln to obtain a titanium dioxide pigment product, wherein the process flow is complex, about 20 steps are needed, more waste is discharged, more operation steps are needed for crystal form conversion, a large amount of energy is needed for the adopted incineration process, and the sulfuric acid method mainly comprises the following steps:

1) Fq6+3h2sch=fe2 (SO 4) 3+3h2o, tio2+2h2so4=ti (SO 4) 2+2hzo;

2) Then fe+f & (SO 4) 3=3fe2so4;

3) Adjusting the pH to 5-6 to hydrolyze Ti (SO 4) 2 to Ti (SO 4) 2+3H2O=H2TiO3J+2H2SO4;

4) The precipitate was filtered and heated to give ti2:h2ti3=tq2+h2ot.

The general process of removing free water and crystal water of the hydrated titanium dioxide (meta-titanic acid) is carried out at 150-300 ℃, the process of desulfurizing is carried out at about 650 ℃, the anatase type is transformed into rutile type during 700-950 ℃, the transformation temperature can be reduced and the transformation rate can be accelerated in the presence of an alkali metal catalyst (salt treating agent); the relative density of titanium dioxide in the calcination process changes along with the change of the product type structure, from 3.92 (anatase type) at 600 ℃ to 4.25 of rutile type at 1000-1200 ℃, and the conversion temperature of the rutile type can be reduced to 850-900 ℃ after the accelerator is added.

Chinese patent CN109850941B discloses a method for preparing high-purity titanium dioxide by hydrolyzing industrial titanium sulfate solution, which belongs to the technical field of chemical industry. The method for preparing high-purity titanium dioxide by hydrolyzing industrial titanium sulfate solution comprises the following steps: freezing out ferrous sulfate crystals from titanium sulfate liquid, and filtering to obtain filtrate A; taking 1 volume of filtrate A and 0.20-1.00 volume of filtrate A, respectively preheating to 90-98 ℃; adding the filtrate A into water under stirring, heating again to maintain a micro-boiling state for 20-40 min, stopping heating, stirring and curing for 20-40 min; heating again to keep the micro-boiling state for 120-240 min, cooling to 60-70 ℃, filtering while the mixture is hot, and washing the filtered solid to obtain purified meta-titanic acid; and (3) heating the purified meta-titanic acid to 750-850 ℃ at a heating rate of 10-15 ℃/min, preserving heat for 100-150 min, and cooling to obtain the high-purity titanium dioxide.

However, according to the technical scheme, although the titanium dioxide can be obtained by utilizing the sulfuric acid method, when the obtained meta-titanic acid (hydrated titanium dioxide) is calcined by adopting a rotary kiln, the hydrated titanium dioxide which is contacted with the preheated gas is polluted seriously due to the fact that the calcination dehydration and desulfurization gas is directly used for carrying out the preheating treatment on the hydrated titanium dioxide which is input into the kiln, so that the dehydration and desulfurization efficiency is reduced, and when the sintering particles are calcined at a high temperature, the formed sintering particles are not convenient to separate from titanium dioxide powder in the kiln, and when the sintering particles exist in the titanium dioxide powder, the calcination uniformity of the titanium dioxide is easily influenced due to the non-uniformity of the particle size.

Disclosure of Invention

The invention aims at overcoming the defects of the prior art, and provides high-purity titanium dioxide production equipment, wherein the air extraction assembly is used for extracting gas which is dehydrated and desulfurized in the rotary kiln assembly through reciprocating motion along the ascending direction of air flow, the gas is isolated and conveyed to the feeding assembly which is conveying materials, the gas is evenly conducted to the conveyed titanium dioxide along the inner spiral channel and the outer spiral channel for isolated preheating, the cleaning assembly is used for carrying out primary filtration after rolling of sintered particles on the dehydrated and desulfurized continuously high-temperature calcined titanium dioxide, and a vortex-shaped filter piece is used for picking up the sintered materials for rotary centrifugation until the sintered materials are blown to an exhaust channel from the vortex-shaped center, so that the isolated preheating of the hydrated titanium dioxide on the input materials in the kiln and the continuous separation and discharge treatment of the sintered materials from the kiln and titanium dioxide powder in the calcination process are realized.

In order to achieve the above purpose, the present invention provides the following technical solutions:

the high-purity titanium dioxide production equipment comprises a rotary kiln assembly, wherein the rotary kiln assembly comprises a dehydration calcination area, a desulfurization calcination area and a transformation calcination area; characterized by further comprising: a feeding assembly for feeding hydrated titanium dioxide into the rotary kiln assembly, the feeding assembly being disposed at one end of a kiln tail of the rotary kiln assembly; the air extraction assembly is used for extracting dehydrated and desulfurized gas to carry out isolated heat supply on the hydrated titanium dioxide conveyed by the feeding assembly, and is arranged on the rotary kiln assembly; the cleaning assembly is used for rolling the titanium dioxide along the rotary conveying direction of the rotary kiln assembly and rotationally separating the sintered material, and is arranged in the rotary kiln assembly; the air extraction component is arranged above a dehydration calcination area and a desulfurization calcination area in the rotary kiln component; the cleaning component is arranged at the tail end of the desulfurization calcining zone of the rotary kiln component to the transformation calcining zone.

Further, the feed assembly includes: the top of the shell is provided with a feed inlet; the material conveying rotator is used for sealing and transmitting the dehydrated and desulfurized gas heat to the hydrated titanium dioxide input by the feed inlet, is inserted on the shell, and the top of the material conveying rotator corresponds to the feed inlet; and the transmission component is used for driving the material conveying rotator to rotate and convey materials and is arranged on the shell.

Further, the material conveying swivel comprises: the outer wall of the material conveying rod piece is provided with an outer spiral channel; the air isolation channel is annularly arranged at one side of the material conveying rod piece along the circumferential direction of the material conveying rod piece; the exhaust port is arranged on the material conveying rod piece and is communicated with the air isolation channel; an inner spiral channel corresponding to the outer spiral channel is formed in the inner wall of the air isolation channel.

Further, the pumping assembly includes: the end part of the air exhaust pipeline is connected to the shell and is correspondingly communicated with the air isolation channel, and air inlets are uniformly formed in the bottom of the air exhaust pipeline; the extraction part is used for reciprocally adjusting the ventilation volume of the air inlet channel to carry out air extraction operation and is arranged in the air extraction pipeline in a sliding way; and a power assembly drivingly connecting the extraction portion with the drive assembly.

Further, the air extraction pipeline comprises: a transversely arranged air inlet channel; an intermediate conduit for communicating and guiding the inlet duct to the center of rotation of the rotary kiln assembly; and a guide duct arranged in a tapered shape for guiding the gas in the intermediate duct to the gas barrier passage.

Further, the extracting section includes: a drive shaft coupled to the power assembly; a suction assembly mounted on the drive shaft; the lower baffle is arranged at the bottom of the air suction assembly and is connected with one side of the air inlet channel in a sliding manner; the power assembly enables the driving shaft to drive the air suction assembly to exhaust air corresponding to the air inlet channel, and enables the driving shaft to move back and forth along the axial direction of the air exhaust pipeline, so that the movable lower baffle plate changes the ventilation quantity of the air inlet channel.

Further, the cleaning assembly includes: the machine frame is arranged along the axial direction of the rotary kiln assembly, and two sides of the machine frame are respectively provided with a gas transmission channel and an exhaust channel; the filter assembly is used for shoveling titanium dioxide in the roller grinding and calcining process and rotationally filtering out sintered particles, and is arranged between the gas transmission channel and the exhaust channel.

Further, the filter assembly includes: the shoveling and pressing assembly is arranged in a J shape, and the shoveling and pressing assembly is used for filtering and discharging after shoveling and rolling titanium dioxide; the rotary filtering assembly is used for rotationally picking up the non-filtered materials on the shovel pressure assembly to rotationally screen and separate out sintered particles, and is arranged above the shovel pressure assembly; the baffle piece is used for shielding the lifted materials and is arranged on one side of the top of the rotary filter assembly; the shoveling assembly shovels and rolls titanium dioxide, primary filtering is carried out on sintering particles in the rotationally moving titanium dioxide, the rotary filtering assembly picks up sintering materials to rotationally separate, the separated titanium dioxide falls to the shoveling assembly, and the sintering particles are blown into an exhaust channel through gas transmission power of a gas transmission channel.

Further, the rotary filter assembly includes: a swirl-like arrangement of filter elements; the rotating seats are arranged on two sides of the filter element and are respectively communicated with the gas transmission channel and the exhaust channel; the linkage assembly is used for driving the rotary seat and the filtering piece to rotate; the linkage assembly is driven by the power assembly.

In order to achieve the above object, the present invention also provides a process for calcining hydrated titanium dioxide in a high purity titanium dioxide production apparatus, characterized by comprising the steps of:

step one, isolating and exhausting, wherein when the feeding assembly feeds the kiln tail of the rotary kiln assembly, the driving shaft is driven to rotate and move back and forth along the axial direction of the rotary kiln assembly, so that the air suction assembly arranged above the dehydration calcining area and the desulfurization calcining area rotates and exhausts air, and the ventilation quantity of the air inlet channel is regulated, and the reciprocating regulation of the air suction intensity from the air inlet channel to the titanium dioxide is carried out;

step two, isolating and feeding, wherein extracted gas enters a gas isolation channel through an air extraction pipeline, hydrated titanium dioxide raw materials are fed towards the kiln tail of the rotary kiln assembly through an outer spiral channel, and the extracted gas is uniformly isolated and thermally conducted to the hydrated titanium dioxide raw materials at the other side through an inner spiral channel;

step three, sintering and filtering, namely, titanium dioxide dehydrated and desulfurized by the rotary kiln assembly reaches the cleaning assembly, the shoveling assembly shovels up the titanium dioxide along the rotating inner wall of the rotary kiln assembly and carries out roller grinding treatment, titanium dioxide fine powder passes through the shoveling assembly and is discharged, and sintered particles and a small amount of titanium dioxide fine powder remained in the shoveling assembly are rotationally picked up by the rotary filtering assembly and are continuously rotationally separated along the vortex-shaped track until the sintered particles rotate to the center of the filtering piece, and are blown out to the exhaust channel by the pneumatic action of the gas transmission channel and are discharged.

The invention has the beneficial effects that:

(1) The invention can realize that the calcining heat provided by the kiln head is extracted and acted on the feeding component which is feeding and can also realize the isolation and heat conduction of the airflow by the mutual coordination between the feeding component and the air extraction component, thereby ensuring the preheating of the hydrated titanium dioxide conveyed to the kiln tail and solving the problem that the pollution is formed because the airflow carries evaporated water and sulfur and directly contacts the hydrated titanium dioxide;

(2) According to the invention, through the double-spiral channel structure design of the outer side of the material conveying rod piece and the inner side of the gas-isolation channel, in the process of conveying the hydrated titanium dioxide, heat can be uniformly conveyed to the outer wall of the material conveying rod piece along the inner side of the gas-isolation channel, so that the heating uniformity of the hydrated titanium dioxide is ensured;

(3) According to the invention, through the matching design between the air extraction pipeline and the extraction part, the evaporation gas can be rapidly extracted along the ascending height direction of the air flow by changing the flux of the air inlet channel in a reciprocating manner;

(4) According to the invention, through the mutual matching between the air extraction assembly and the cleaning assembly, the sintered particles are rotationally filtered and removed when the titanium dioxide subjected to air extraction, dehydration and desulfurization is continuously transformed into the rutile type, so that the technical problem that the heating uniformity of the titanium dioxide powder is influenced because the sintered particles exist in the titanium dioxide powder is solved while the sintered particles are cleaned during the titanium dioxide calcination;

(5) According to the invention, through the mutual matching between the shoveling and pressing assembly and the rotary filtering assembly and the vortex-shaped filtering design of the rotary filtering assembly, the primary shoveling and filtering of the sintered particles can be realized, meanwhile, the mode of picking up the sintered material subjected to the primary filtering through the rotary filtering can be realized, the titanium dioxide adsorbed on the surfaces of the sintered particles can be rapidly removed, and the continuous discharge of the cleaned sintered particles can be synchronously completed;

in summary, the method has the advantages of isolating preheated input materials, rapidly removing sintered particles and the like during the calcination of the hydrated titanium dioxide.

Drawings

FIG. 1 is a schematic diagram of the overall structure of the present invention;

FIG. 2 is a cross-sectional view of FIG. 1 of the present invention;

FIG. 3 is a schematic view of the internal structure of the rotary kiln assembly of the present invention;

FIG. 4 is a schematic view of a cleaning assembly according to the present invention;

FIG. 5 is a cross-sectional view of FIG. 4 in accordance with the present invention;

FIG. 6 is a cross-sectional view of a filter assembly of the present invention;

FIG. 7 is a schematic view of a portion of the structure of the linkage assembly of the present invention;

FIG. 8 is a schematic view of the structure of the pumping assembly of the present invention;

FIG. 9 is an enlarged view of the invention at A in FIG. 8;

FIG. 10 is a schematic view of the bottom side structure of the suction duct of the present invention;

FIG. 11 is a schematic view of the structure of the cross section of the air extraction pipeline end of the present invention;

FIG. 12 is a schematic view of a feed assembly of the present invention;

FIG. 13 is a cross-sectional view of FIG. 12 in accordance with the present invention;

FIG. 14 is an enlarged view of the portion B of FIG. 13 in accordance with the present invention;

fig. 15 is a flow chart of the production process of the present invention.

Detailed Description

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.

In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.

Examples: as shown in fig. 1, a high purity titanium dioxide production apparatus comprises a rotary kiln assembly 1, wherein the rotary kiln assembly 1 comprises a dehydration calcination area, a desulfurization calcination area and a transformation calcination area; further comprises: a feeding assembly 2 for feeding hydrated titanium dioxide to the rotary kiln assembly 1, the feeding assembly 2 being arranged at one end of the kiln tail of the rotary kiln assembly 1; the air extraction assembly 3 is used for extracting dehydrated and desulfurized gas to carry out isolated heat supply on the hydrated titanium dioxide conveyed by the feeding assembly 2, and the air extraction assembly 3 is arranged on the rotary kiln assembly 1; the cleaning assembly 4 is used for rolling the titanium dioxide along the rotary conveying direction of the rotary kiln assembly 1, and the cleaning assembly 4 for rotationally separating the sintered material is arranged in the rotary kiln assembly 1; the air extraction assembly 3 is arranged above a dehydration calcining area and a desulfurization calcining area in the rotary kiln assembly 1; the cleaning component 4 is arranged from the tail end of the desulfurization calcination area to the transformation calcination area of the rotary kiln component 1.

From the above, it can be seen that in the process of producing hydrated titanium dioxide by sulfuric acid method, removal of free water and crystal water, desulfurization and conversion of anatase to rutile are completed by calcining, and the rotary kiln assembly 1 in the present invention is preferably a rotary kiln in the prior art, that is, by setting the calcining temperature from the kiln tail to the kiln head, (1) 150-300 ℃ (2) 650 ℃ for desulfurization process of removing free water and crystal water, (3) 700-950 ℃ for conversion of anatase to rutile; in the calcination process, the hydrated titanium dioxide is continuously conveyed by the feeding component 2 to be added from the kiln tail of the rotary kiln component 1, and in order to improve the high efficiency of heat utilization when the hydrated titanium dioxide is added, the evaporated gas after dehydration, desulfurization and calcination is pumped out and conveyed to the feeding component 2 in an isolated state, so that the hydrated titanium dioxide which is being input into the rotary kiln component 1 is subjected to isolated preheating treatment, and the pollution of the water and sulfur in the separated air flow to the input titanium dioxide caused by directly preheating the input hydrated titanium dioxide in an unsealed state is solved; and when the anatase type is converted to the rutile type by the calcination of the titanium dioxide, the sintering phenomenon is easy to occur during the calcination due to the influence of factors such as the calcination temperature, and the sintered particles are difficult to directly remove from the rotary kiln assembly 1, and the heating uniformity of the surrounding titanium dioxide during the calcination is also easy to influence, so that the sintered titanium dioxide can be rolled out by primarily rolling the titanium dioxide when the calcination treatment is carried out at 700-950 ℃ by utilizing the cleaning assembly 4, the unsintered titanium dioxide powder is released, the primarily rolled titanium dioxide is separated by rotary filtration, and the filtered titanium dioxide powder is output to a kiln head through the cleaning assembly 4.

It should be added that, as shown in fig. 1, the rotary kiln assembly 1 includes a kiln 11 with a kiln head at a low position and a kiln tail at a high position, a kiln seat 12 disposed below the kiln 11, a driving assembly 13 mounted on the kiln seat 12 and used for driving the kiln 11 to rotate, and a burner 14 disposed at the kiln head, where the driving assembly 13 and the burner 14 are all of the prior art in the rotary kiln field, and are not described herein.

As shown in fig. 12, the feeding assembly 2 includes: a shell 21, wherein a feed inlet 211 is formed in the top of the shell 21; a material conveying rotator 22, wherein the material conveying rotator 22 for sealing and conducting the heat of dehydrated and desulfurized gas to the hydrated titanium dioxide input by the feed inlet 211 is inserted on the shell 21, and the top of the material conveying rotator corresponds to the feed inlet 211; and a transmission assembly 23, wherein the transmission assembly 23 for driving the material conveying rotator 22 to rotate the material conveying is arranged on the shell 21.

In this embodiment, in the process of feeding the kiln tail of the rotary kiln assembly 1, the feeding assembly 2 adds hydrated titanium dioxide into the feed inlet 211 above the shell 21, and then drives the feeding assembly through the driving of the transmission assembly 23, so that the rotation of the feeding swivel 22 is realized, and the continuous addition of the hydrated titanium dioxide material to the rotary kiln assembly 1 is realized, and meanwhile, in order to realize the preheating treatment of the hydrated titanium dioxide, the dehydrated and desulfurized hot air flow is extracted through the air extraction assembly 3 for closed preheating treatment, so as to avoid pollution of dehydrated water and sulfur to the input hydrated titanium dioxide.

Notably, to ensure adequate removal of dehydrated gas from the hydrated titanium dioxide, the suction end of the suction assembly 3 extends to the discharge location of the feed assembly 2.

As shown in fig. 12 and 13, the feed swivel 22 includes: the material conveying rod piece 221, wherein an outer spiral channel 2211 is formed in the outer wall of the material conveying rod piece 221; the air isolation channel 222 is annularly arranged at one side of the material conveying rod 221 along the circumferential direction of the material conveying rod 221; and an exhaust port 223, which is formed on the material transporting rod 221 and is arranged on the opposite side of the air isolating channel 222, wherein the exhaust port 223 is communicated with the air isolating channel 222; an inner spiral passage 2212 corresponding to the outer spiral passage 2211 is formed on the inner wall of the air-blocking passage 222.

In this embodiment, during the process of conveying and preheating the hydrated titanium dioxide, the material conveying rotator 22 extracts the gas into the gas isolation channel 222 through the air extraction component 3 and discharges the gas from the air outlet 223 to the rotary kiln component 1, and when the gas passes through the gas isolation channel 222, the gas passes through the inner spiral channel 2212 which is arranged corresponding to the outer spiral channel 2211 for conveying, so that the thermal current can realize the temporary stay heat conduction of the inner wall of the gas isolation channel 222, and the uniformity of the distance between the inner wall of the gas isolation channel 222 and the outer wall of the material conveying rod 221, thereby ensuring the uniformity of the heat conducted to the outside of the material conveying rod 221 when acting on the hydrated titanium dioxide.

It should be noted that, as shown in fig. 12 and 13, the transmission assembly 23 includes a first transmission gear 231 installed on the material conveying rod 221, a second transmission gear 232 meshed with the first transmission gear 231, and a transmission motor 233 installed on the housing 21 and having a power end connected to the second transmission gear 232, where the transmission motor 233 is preferably a servo motor, and the exhaust port 223 passes through the first transmission gear 231.

As shown in fig. 8 and 10, the pumping assembly 3 includes: the air exhaust pipeline 31, the end part of the air exhaust pipeline 31 connected to the shell 21 is correspondingly communicated with the air isolation channel 222, and the bottom of the air exhaust pipeline 31 is uniformly provided with an air inlet channel 311; an extraction part 32, wherein the extraction part 32 for reciprocally adjusting the ventilation of the air inlet 311 to perform air extraction operation is slidably disposed in the air extraction pipe 31; and a power assembly 33 drivingly connecting the extraction portion 32 with the drive assembly 23.

In this embodiment, when the air extraction assembly 3 performs the air extraction operation, the air extraction portion 32 continuously extracts the air under the air inlet 311 at each position, and at the same time, by changing the air flux of the air inlet 311, the air extraction operation along different heights under the air inlet 311 can be realized under the condition of unchanged extraction power, and the air under each height under the air inlet 311 can be efficiently discharged.

As shown in fig. 12, the air extraction duct 31 includes: a laterally arranged inlet duct 311; an intermediate pipe 312 for communicating and guiding the air inlet 311 to the rotation center of the rotary kiln assembly 1; and a guide duct 313, which is arranged in a tapered shape, for guiding the gas in the intermediate duct 312 to the gas barrier passage 222.

In the present embodiment, in order to ensure the corresponding and uniform delivery of the gas extracted through the gas extraction pipe 31 to the gas separation channel 222, the gas collected by the gas inlet channel 311, which is offset from the center of the gas separation channel 222, is introduced into the center of the gas separation channel 222 by using the guide pipe 313 and uniformly distributed into the gas separation channel 222, thereby ensuring the heating uniformity when the hydrated titanium dioxide is preheated.

As shown in fig. 10 and 11, the extracting section 32 includes: a drive shaft 321 connected to the power assembly 33; a suction assembly mounted on the driving shaft 321; and a lower baffle 323 installed at the bottom of the suction assembly and slidably connected to one side of the air inlet 311; the power assembly 33 makes the driving shaft 321 drive the air suction assembly to perform air suction corresponding to the air inlet channel 311, and the power assembly 33 makes the driving shaft 321 move back and forth along the axial direction of the air suction pipeline 31, so that the moving lower baffle 323 changes the ventilation volume of the air inlet channel 311.

In this embodiment, the extracting portion 32 can drive the air suction assembly to work through the rotation of the driving shaft 321 in the extracting process, so as to enable the air suction assembly to generate suction force to each air inlet 311, and drive the air suction assembly and the lower baffle 323 to move through the movement of the driving shaft 321, so as to enable the lower baffle 323 to adjust the shielding amount of the air inlet 311, and thus adjust the air inlet flux of the air inlet 311.

As shown in fig. 11, the suction assembly includes a sliding seat 3221 slidably disposed in the air inlet 311, and an impeller 3222 rotatably mounted in the sliding seat 3221 and circumferentially mounted on the driving shaft 321.

In this embodiment, the impeller 3222 is a fan impeller that provides suction power, and will not be described here.

As shown in fig. 13, the power assembly 33 includes a first power assembly 331 for rotating the driving shaft 321 and a second power assembly 332 for moving the driving shaft 321 back and forth in the axial direction thereof.

As shown in fig. 14, the first power assembly 331 includes a first belt pulley 3311 slidably connected to the driving shaft 321 and disposed in the middle pipe 312, a first disc seat 3312 for mounting the first belt pulley 3311 on the inner wall of the middle pipe 312, a power rod 3315 disposed below the first belt pulley 3311 and connected to the material feeding rod 221, a second belt pulley 3316 mounted on the power rod 3315, a first power belt 3314 for driving the first belt pulley 3311 and the second belt pulley 3316, and splines 3313 axially disposed on the driving shaft 321 and slidably passing through both sides of the first belt pulley 3311.

In this embodiment, when the material conveying rod 221 rotates, the second belt disc 3316 is driven to rotate, so that the material conveying rod is transmitted to the first belt disc 3311 through the first power belt 3314, and then the driving shaft 321 connected through the spline 3313 is driven to rotate, so that the air suction component is driven to perform air suction.

As shown in fig. 9 and 12, the second power assembly 332 includes a guide member 3321 mounted on an end portion of the driving shaft 321, a guide rail 3322 disposed on the guide member 3321 in a symmetrical S shape, and a guide rod 3323 connected to the guide duct 313 and slidably inserted into the guide rail 3322.

In this embodiment, when the driving shaft 321 rotates, the guiding element 3321 is driven to rotate, so that the guiding rod 3323 moves in the guiding track 3322, and the guiding rod 3323 drives the driving shaft 321 to move back and forth along the axial direction of the driving shaft 321.

Examples: as shown in fig. 4, wherein the same or corresponding parts as those in the first embodiment are denoted by the corresponding reference numerals as in the first embodiment, only the points of distinction from the first embodiment will be described below for the sake of brevity. The second embodiment is different from the first embodiment in that:

the cleaning assembly 4 comprises: the machine frame 41 is arranged along the axial direction of the rotary kiln assembly 1, and two sides of the machine frame 41 are respectively provided with a gas transmission channel 411 and an exhaust channel 412; the filter assembly 42 is arranged between the gas transmission channel 411 and the exhaust channel 412, and the filter assembly 42 is used for scooping titanium dioxide in the roller grinding and calcining process and filtering out sintered particles in a rotating way.

In this embodiment, when the cleaning assembly 4 processes the sintered particles during the calcination process in the kiln, the gas is input through the gas transmission channel 411 (note that, in order to ensure the atmosphere in the kiln, the input gas is inert gas), and after the sintered particles are filtered out by the filtering assembly 42, the sintered particles move to the rotation center of the filtering assembly 42, so that the gas transmission channel 411 blows the sintered particles into the obliquely arranged exhaust channel 412 along the rotation center, and slides out of the kiln head of the rotary kiln assembly 1 along the exhaust channel 412 to be discharged.

As shown in fig. 4, the filter assembly 42 includes: the shoveling and pressing assembly 421 is arranged in a J shape, and the shoveling and pressing assembly 421 is used for filtering and discharging after shoveling and rolling titanium dioxide; the rotary filtering component 422 is used for rotationally picking up the non-filtered material on the shoveling component 421 to rotationally screen and separate out sintered particles, and the rotary filtering component 422 is arranged above the shoveling component 421; and a blocking piece 423 for blocking the lifted material, wherein the blocking piece 423 is arranged at one side of the top of the rotary filter assembly 422; the shoveling component 421 shovels and rolls titanium dioxide, meanwhile, primary filtering is carried out on sintering particles in the rotationally moving titanium dioxide, the rotary filtering component 422 picks up sintering materials to rotationally separate, the separated titanium dioxide falls to the shoveling component 421, and the sintering particles are blown into the exhaust channel 412 through gas transmission power of the gas transmission channel 411.

In this embodiment, when the filter assembly 42 performs the filtering treatment on the sintered particles, the titanium dioxide powder moving along the conveying direction of the rotary kiln is shoveled into the filter assembly 421, and during the filtering, in order to reduce the titanium dioxide powder being mixed on the sintered particles, the primary rolling treatment on the sintered particles can be performed through the shoveling assembly 421, and then the filter is performed, and when the titanium dioxide powder moves towards the kiln head side, the sintered particles and the attached titanium dioxide powder which are left after the filtering can be gradually entered into the shoveling assembly 421 in a J shape, and are picked up by the rotary filter assembly 422, and are centrifugally filtered while being continuously moved towards the rotary center, and meanwhile, under the pneumatic action of the air conveying channel 411, the high-efficiency removal of the titanium dioxide powder attached on the sintered particles can be realized, and meanwhile, the separated sintered particles can be quickly led out and discharged; and in order to ensure that powder flies during the filtering process, the blocking piece 423 arranged above the rotary filtering assembly 422 can play a good role in blocking.

As shown in fig. 5 and 6, the shovel assembly 421 includes a J-shaped bracket 4211 mounted on the frame 41, a J-shaped filter screen 4212 mounted on the J-shaped bracket 4211, a pressing roller 4213 disposed above the J-shaped filter screen 4212 and connected to the frame 41, a scraper 4216 disposed on one side of the pressing roller 4213, a fifth reel 4214 mounted on the pressing roller 4213, a sixth reel mounted on the rotary filter assembly 422, and a driving belt 4215 driving the fifth reel 4214 to the sixth reel; a chamfer-shaped shovel head is arranged on one side of the front section of the J-shaped bracket 4211.

In this embodiment, when the rotary filter assembly 422 rotates, the sixth belt disc drives the fifth belt disc 4214 to rotate, so that the pressing roller 4213 rolls the sintered particles with larger rolling particles, and the surface of the pressing roller 4213 is cleaned by the scraper 4216 during the rotation process.

It is noted that, when the rotary filter assembly 422 drives the press roller 4213 to rotate, the press roller 4213 can be rotated reversely by adjusting the structural design, so that the press roller 4213 rotates to roll the sintered particles, meanwhile, the sintered particles can pass through the bottom of the press roller 4213 quickly, and the invention can be realized.

As shown in fig. 6, the rotary filter assembly 422 includes: a swirl-arranged filter 4221; the rotating seats 4222 are installed on two sides of the filter 4221 and are respectively communicated with the gas transmission channel 411 and the gas exhaust channel 412; and a link assembly 4223 for driving the rotation of the rotation base 4222 and the filter member 4221; the linkage assembly 4223 is transmitted through the power assembly 33.

In this embodiment, the power unit 33 transmits power to the filter member 4221 to rotate through the linkage unit 4223, so that the filter member 4221 continuously filters out the sintered particles along the vortex-shaped filtering track to the vortex-shaped center, and blows out the sintered particles through the gas transmission channel 411.

It is noted that during the rotation of the filter member 4221, the maximum outer diameter thereof continuously rotates along the arc-shaped arrangement surface of the J-shaped filter screen 4212 during the rotation, so that when the inner wall of the J-shaped filter screen 4212 collects the filtered sintered particles and titanium dioxide powder, the purpose of rotating the filter member 4221 to scoop the sintered particles and titanium dioxide powder for rotation along the vortex path can be achieved.

As shown in fig. 5 and 7, the linkage assembly 4223 comprises a fixed base 42232 mounted on the frame 41, a rotating shaft 42231 movably passing through the fixed base 42232, a first bevel gear 42233 mounted on the rotating shaft 42231 and in driving connection with the rotating base 4222, a seventh gear 42234 mounted on the rotating shaft 42231, a transmission base 42235 mounted on the frame 41 and arranged between two adjacent sets of seventh gears 42234, a transmission shaft 42236 movably passing through the transmission base 42235, and an eighth gear 42237 mounted on two ends of the transmission shaft 42236 and in driving engagement with two adjacent sets of seventh gears 42234, wherein a second bevel gear in driving engagement with the first bevel gear 42233 is arranged on one side of the rotating base 4222.

In this embodiment, when the transmission assembly 23 is driven to rotate with the rotation shaft 42231 correspondingly connected to the transmission assembly, the first helical gear 42233 drives the second helical gear to rotate, and simultaneously, the filter member 4221 rotates to filter out sintered particles, and the rotating rotation shaft 42231 also drives each group of filter members 4221 arranged along the direction of the frame 41 to rotate to filter out sintered particles through the transmission connection between the seventh gear 42234 and the eighth gear 42237, so as to realize the filtration of sintered particles along the output direction of titanium dioxide in the calcination process.

As shown in fig. 9 and 14, the power assembly 33 further includes a third power assembly 333 for driving the linkage assembly 4223, the third power assembly 333 including a ninth transmission gear 3332 mounted on the driving shaft 321 penetrating to the outer portion of the middle pipe 312, a gear support 3331 mounted on the outer portion of the guide pipe 313, a tenth transmission gear 3333 mounted on the gear support 3331 and in driving engagement with the ninth transmission gear 3332, an eleventh reel 3334 mounted coaxially with the tenth transmission gear 3333, a twelfth reel 3335 provided below the eleventh reel 3334 and mounted on the rotation shaft 42231, a power transmission belt 3336 drivingly connecting the eleventh reel 3334 and the twelfth reel 3335, and a support bar 3337 mounted on the outer wall of the guide pipe 313 and movably connected with the end portion of the rotation shaft 42231.

In this embodiment, when the driving shaft 321 rotates, the ninth transmission gear 3332 is driven to rotate, and then the tenth transmission gear 3333 is driven, and the rotation shaft 42231 is driven to rotate by belt and wheel transmission, so as to drive the filter 4221 to rotate for filtering.

Examples: as shown in fig. 15, a process for producing high purity titanium dioxide comprises the steps of:

step one, isolating and exhausting, wherein when the feeding assembly 2 feeds the kiln tail of the rotary kiln assembly 1, the driving shaft 321 rotates and moves back and forth along the axial direction of the rotary kiln assembly 1, so that the air suction assembly arranged above the dehydration calcining area and the desulfurization calcining area rotates and exhausts air, and the ventilation quantity of the air inlet channel 311 is adjusted, and the reciprocating adjustment of the air suction intensity from the air inlet channel 311 to the titanium dioxide is carried out;

step two, isolating and feeding, wherein extracted gas enters a gas isolation channel 222 through an air extraction pipeline 31, hydrated titanium dioxide raw materials are fed towards the kiln tail of the rotary kiln assembly 1 through an outer spiral channel 2211, and simultaneously the extracted gas is uniformly isolated and thermally conducted to the hydrated titanium dioxide raw materials at the other side through an inner spiral channel 2212;

step three, sintering and filtering, namely, the titanium dioxide dehydrated and desulfurized by the rotary kiln assembly 1 reaches the cleaning assembly 4, the shoveling assembly 421 shovels the titanium dioxide along the rotating inner wall of the rotary kiln assembly 1 and carries out roller grinding treatment, the titanium dioxide fine powder passes through the shoveling assembly 421 to be discharged, the sintered particles and a small amount of titanium dioxide fine powder remained in the shoveling assembly 421 are rotationally picked up by the rotating and filtering assembly 422 and are continuously rotationally separated along the vortex-shaped track until the sintered particles rotate to the center of the filter element 4221, and are blown out to the exhaust channel 412 to be discharged under the pneumatic action of the gas transmission channel 411.

The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.

Claims (7)

1. The high-purity titanium dioxide production equipment comprises a rotary kiln assembly, wherein the rotary kiln assembly comprises a dehydration calcination area, a desulfurization calcination area and a transformation calcination area;

characterized by further comprising:

a feeding assembly for feeding hydrated titanium dioxide into the rotary kiln assembly, the feeding assembly being disposed at one end of a kiln tail of the rotary kiln assembly;

the air extraction assembly is used for extracting dehydrated and desulfurized gas to carry out isolated heat supply on the hydrated titanium dioxide conveyed by the feeding assembly, and is arranged on the rotary kiln assembly; and

the cleaning assembly is used for rolling the titanium dioxide along the rotary conveying direction of the rotary kiln assembly and rotationally separating the sintered material, and is arranged in the rotary kiln assembly;

the air extraction component is arranged above a dehydration calcination area and a desulfurization calcination area in the rotary kiln component;

the cleaning component is arranged from the tail end of the desulfurization calcination area of the rotary kiln component to the transformation calcination area;

the cleaning assembly includes:

the machine frame is arranged along the axial direction of the rotary kiln assembly, and two sides of the machine frame are respectively provided with a gas transmission channel and an exhaust channel;

the filter assembly is used for scooping up and rolling titanium dioxide in the calcination process and rotationally filtering out sintered particles, and is arranged between the gas transmission channel and the exhaust channel;

the filter assembly includes:

the shoveling and pressing assembly is arranged in a J shape, and the shoveling and pressing assembly is used for filtering and discharging after shoveling and rolling titanium dioxide;

the rotary filtering assembly is used for rotationally picking up the non-filtered materials on the shovel pressure assembly to rotationally screen and separate out sintered particles, and is arranged above the shovel pressure assembly; and

the baffle piece is used for shielding lifted materials and is arranged on one side of the top of the rotary filter assembly;

the shoveling assembly shovels and rolls titanium dioxide, primary filtering is carried out on sintering particles in the rotationally moving titanium dioxide, the rotary filtering assembly picks up sintering materials to rotationally separate, the separated titanium dioxide falls to the shoveling assembly, and the sintering particles are blown into an exhaust channel through gas transmission power of a gas transmission channel;

the rotary filter assembly includes:

a swirl-like arrangement of filter elements;

the rotating seats are arranged on two sides of the filter element and are respectively communicated with the gas transmission channel and the exhaust channel; and

a linkage assembly for driving the rotary seat and the filter element to rotate;

the linkage assembly is driven by the power assembly.

2. A high purity titanium dioxide production apparatus according to claim 1, wherein,

the feed assembly includes:

the top of the shell is provided with a feed inlet;

the material conveying rotator is used for sealing and transmitting the dehydrated and desulfurized gas heat to the hydrated titanium dioxide input by the feed inlet, is inserted on the shell, and the top of the material conveying rotator corresponds to the feed inlet; and

the transmission component is used for driving the material conveying rotator to rotate and convey materials, and is arranged on the shell.

3. A high purity titanium dioxide production apparatus according to claim 2, wherein,

the material conveying swivel comprises:

the outer wall of the material conveying rod piece is provided with an outer spiral channel;

the air isolation channel is annularly arranged at one side of the material conveying rod piece along the circumferential direction of the material conveying rod piece; and

the exhaust port is arranged on the material conveying rod piece and is communicated with the air isolation channel;

an inner spiral channel corresponding to the outer spiral channel is formed in the inner wall of the air isolation channel.

4. A high purity titanium dioxide production apparatus according to claim 3,

the air extraction assembly includes:

the end part of the air exhaust pipeline is connected to the shell and is correspondingly communicated with the air isolation channel, and air inlets are uniformly formed in the bottom of the air exhaust pipeline;

the extraction part is used for reciprocally adjusting the ventilation volume of the air inlet channel to carry out air extraction operation and is arranged in the air extraction pipeline in a sliding way; and

and the power assembly is used for connecting the extraction part with the transmission assembly in a transmission way.

5. A high purity titanium dioxide production apparatus according to claim 4,

the air extraction pipeline comprises:

a transversely arranged air inlet channel;

an intermediate conduit for communicating and guiding the inlet duct to the center of rotation of the rotary kiln assembly; and

a guide pipe arranged in a cone shape for guiding the gas in the middle pipe to the gas isolation passage.

6. A high purity titanium dioxide production apparatus according to claim 4,

the extraction section includes:

a drive shaft coupled to the power assembly;

a suction assembly mounted on the drive shaft; and

the lower baffle is arranged at the bottom of the air suction assembly and is connected with one side of the air inlet channel in a sliding manner;

the power assembly enables the driving shaft to drive the air suction assembly to exhaust air corresponding to the air inlet channel, and enables the driving shaft to move back and forth along the axial direction of the air exhaust pipeline, so that the movable lower baffle plate changes the ventilation quantity of the air inlet channel.

7. The process for calcining hydrated titanium dioxide in a high purity titanium dioxide production apparatus of claim 6, comprising the steps of:

step one, isolating and exhausting, wherein when the feeding assembly feeds the kiln tail of the rotary kiln assembly, the driving shaft is driven to rotate and move back and forth along the axial direction of the rotary kiln assembly, so that the air suction assembly arranged above the dehydration calcining area and the desulfurization calcining area rotates and exhausts air, and the ventilation quantity of the air inlet channel is regulated, and the reciprocating regulation of the air suction intensity from the air inlet channel to the titanium dioxide is carried out;

step two, isolating and feeding, wherein extracted gas enters a gas isolation channel through an air extraction pipeline, hydrated titanium dioxide raw materials are fed towards the kiln tail of the rotary kiln assembly through an outer spiral channel, and the extracted gas is uniformly isolated and thermally conducted to the hydrated titanium dioxide raw materials at the other side through an inner spiral channel;

step three, sintering and filtering, namely, titanium dioxide dehydrated and desulfurized by the rotary kiln assembly reaches the cleaning assembly, the shoveling assembly shovels up the titanium dioxide along the rotating inner wall of the rotary kiln assembly and carries out roller grinding treatment, titanium dioxide fine powder passes through the shoveling assembly and is discharged, and sintered particles and a small amount of titanium dioxide fine powder remained in the shoveling assembly are rotationally picked up by the rotary filtering assembly and are continuously rotationally separated along the vortex-shaped track until the sintered particles rotate to the center of the filtering piece, and are blown out to the exhaust channel by the pneumatic action of the gas transmission channel and are discharged.

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