阅读说明：本技术 一种钛白粉气流粉碎方法 (Titanium dioxide airflow crushing method ) 是由 周兰英 于 2021-09-24 设计创作，主要内容包括：本发明涉及一种钛白粉气流粉碎方法,包括以下步骤：S1：将粗二氧化钛经过打粉机粉碎后获得钛白粉原料；S2：将步骤一中的钛白粉原料倒入气流粉碎机中进行气流粉碎；S3：将步骤二中经过气流粉碎后的钛白粉原料再倒入气流粉碎机中进行一次气流粉碎：同时向气流粉碎机中倒入无机处理剂；S4：检测步骤三中所获得的产品颗粒粒径范围,收集检测合格后的钛白粉,本发明通过先将粗二氧化钛经过打粉机粉碎后再进行第一次气流粉碎,可以提高气流粉碎效率和速度,再经过两次气流粉碎并混合无机处理剂,可以获得具有高耐候性的细致钛白粉。(The invention relates to a titanium dioxide jet milling method, which comprises the following steps: s1: crushing the crude titanium dioxide by a powder grinding machine to obtain a titanium dioxide raw material; s2: pouring the titanium dioxide raw material in the step one into a jet mill for jet milling; s3: and (3) pouring the titanium dioxide raw material subjected to airflow crushing in the step two into an airflow crusher for primary airflow crushing: simultaneously pouring an inorganic treating agent into the jet mill; s4: and (3) detecting the particle size range of the product obtained in the third step, and collecting the qualified titanium dioxide, wherein the coarse titanium dioxide is crushed by a powder grinding machine and then subjected to primary airflow crushing, so that the airflow crushing efficiency and speed can be improved, and the fine titanium dioxide with high weather resistance can be obtained by performing airflow crushing twice and mixing an inorganic treating agent.)

1. A titanium dioxide jet milling method is characterized in that: the method comprises the following steps:

s1: crushing the crude titanium dioxide by a powder grinding machine to obtain a titanium dioxide raw material;

s2: pouring the titanium dioxide raw material in the step one into a jet mill for jet milling;

s3: blowing the titanium dioxide raw material subjected to airflow crushing in the step two into an airflow crusher for primary airflow crushing, and pouring an inorganic treating agent into the airflow crusher; the jet mill comprises a mill body (1), a feed hopper (2), a first-stage crushing barrel (3) and a second-stage crushing barrel (4), the bottom end of the feed hopper (2) is communicated with an inlet pipe (8), a first electromagnetic valve (12) is installed in the inlet pipe (8), a water pipe (5) is arranged on the top end of the mill body (1), one end of the water pipe (5) is connected with a water source, the other end of the water pipe is inserted into a second-stage discharging pipe (7), a water outlet spray head (14) is arranged at one end of the water pipe (5) located on the second-stage discharging pipe (7), the first-stage crushing barrel (3) is transversely installed in the mill body (1), the bottom end of the inlet pipe (8) penetrates through a shell of the mill body (1) to be communicated with the first-stage crushing barrel (3), the second-stage crushing barrel (4) is vertically installed in the mill body (1), the second-stage crushing barrel (4) is communicated with the second-stage discharging pipe (7) on the right side, one end of the second-stage discharging pipe (7) penetrates through and extends to the outer side of the machine body (1), a vertically-placed first-stage discharging pipe (6) is fixedly inserted into the first-stage crushing barrel (3), a reagent adding port (19) is formed in the top end of the first-stage discharging pipe (6), a transversely-placed material guide pipe (18) is communicated with the first-stage discharging pipe (6), a second electromagnetic valve (13) is installed in the material guide pipe (18), one end of the material guide pipe (18) is communicated with the second-stage discharging pipe (7), the other end of the material guide pipe (18) penetrates through the machine body (1) and is connected with an air source, high-pressure airflow connecting pipes (15) and water discharge pipes (16) are arranged on the first-stage crushing barrel (3) and the second-stage crushing barrel (4), valves are arranged on the water discharge pipes (16), and screening devices (17) are installed in the first-stage crushing barrel (3) and the second-stage crushing barrel (4);

s4: detecting the particle size range of the product obtained in the third step, and collecting the qualified titanium dioxide.

2. The titanium dioxide jet milling method according to claim 1, characterized in that: and the steam pressure of the airflow crushing in the step two is 1-2 MPa.

3. The titanium dioxide jet milling method according to claim 2, characterized in that: the steam pressure of the jet milling in the third step is 2.6-3 MPa.

4. The titanium dioxide jet milling method according to claim 3, characterized in that: the inorganic treating agent is one or more of a sodium silicate reagent, a sodium metaaluminate reagent and a titanyl sulfate reagent.

5. The titanium dioxide jet milling method according to claim 4, characterized in that: the weight ratio of the inorganic treating agent to the titanium dioxide raw material is 0.001-0.1: 1.

6. The titanium dioxide airflow crushing method according to claim 5, characterized in that: the particle size range of the titanium dioxide particles qualified in the detection in the fourth step is 0.1-0.5 mu m.

7. The titanium dioxide airflow crushing method according to claim 6, characterized in that: go out water spray head (14) quantity and be a plurality of, it is a plurality of go out water spray head (14) are located one-level crushing barrel (3), second grade crushing barrel (4), one-level discharging pipe (6) and second grade discharging pipe (7) respectively.

8. The titanium dioxide jet milling method according to claim 7, characterized in that: fixedly connected with triangular supports frame (10) in feeder hopper (2), fixed mounting has motor (9) in triangular supports frame (10), motor (9) output shaft and (mixing) shaft (11) fixed connection, (mixing) shaft (11) bottom is arranged in inlet pipe (8).

9. The titanium dioxide jet milling method according to claim 8, characterized in that: the screening device (17) comprises a second motor (1701) and a grading impeller (1702), an output shaft of the second motor (1701) is fixedly connected with the grading impeller (1702), the grading impeller (1702) corresponds to the discharge pipe, and the impeller clearance of the grading impeller (1702) in the first-stage crushing barrel (3) is larger than that of the grading impeller (1702) in the second-stage crushing barrel (4).

Technical Field

The invention relates to the technical field of jet milling, in particular to a titanium dioxide jet milling method.

Background

The titanium dioxide has stable chemical properties and does not react with most substances under general conditions. In nature, titanium dioxide has three types of crystals, namely, brookite type, anatase type and rutile type. The brookite type is an unstable crystal form and has no industrial utilization value, and Anatase type (Anatase) is called A type for short, and Rutile type (Rutile) is called R type for short, both have stable crystal lattices, are important white pigments and porcelain glaze materials, have superior whiteness, tinting strength, covering power, weather resistance, heat resistance and chemical stability compared with other white pigments, particularly have no toxicity, are the white pigments with the best performance in the world at present, and are widely applied to the industries of coatings, plastics, papermaking, printing ink, chemical fibers, rubber, cosmetics and the like.

Titanium dioxide is used as an important white pigment, and a series of application performances of whiteness, tone, gloss, decoloring force, dispersibility, covering power, durability and the like of the titanium dioxide are directly influenced by an inorganic coating and an organic coating of the titanium dioxide.

Disclosure of Invention

In order to overcome the technical defects in the prior art, the invention provides a titanium dioxide airflow crushing method, which can effectively solve the problems in the background art.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

the embodiment of the invention discloses a titanium dioxide jet milling method, which comprises the following steps:

s1: crushing the crude titanium dioxide by a powder grinding machine to obtain a titanium dioxide raw material;

s2: pouring the titanium dioxide raw material in the step one into a jet mill for jet milling;

s3: blowing the titanium dioxide raw material subjected to airflow crushing in the step two into an airflow crusher for primary airflow crushing, and pouring an inorganic treating agent into the airflow crusher; the jet mill comprises a mill body, a feed hopper, a primary crushing barrel and a secondary crushing barrel, wherein the bottom end of the feed hopper is communicated with a feed pipe, a first electromagnetic valve is installed in the feed pipe, the top end of the mill body is provided with a water pipe, one end of the water pipe is connected with a water source, the other end of the water pipe is inserted in the secondary discharging pipe, a water outlet nozzle is arranged at one end of the secondary discharging pipe, the primary crushing barrel is transversely installed in the mill body, the bottom end of the feed pipe penetrates through a mill body shell and is communicated with the primary crushing barrel, the secondary crushing barrel is vertically installed in the mill body, the right side of the secondary crushing barrel is communicated with the secondary discharging pipe, one end of the secondary discharging pipe penetrates through and extends to the outside of the mill body, the primary crushing barrel is fixedly inserted with a vertically placed primary discharging pipe, the top end of the primary discharging pipe is provided with a reagent adding port, and the primary discharging pipe is communicated with a transversely placed guide pipe, the feeding pipe is internally provided with a second electromagnetic valve, one end of the feeding pipe is communicated with the second-stage discharging pipe, the other end of the feeding pipe is inserted into the machine body and is connected with an air source, the first-stage crushing barrel and the second-stage crushing barrel are respectively provided with a high-pressure airflow connecting pipe and a drain pipe, the drain pipe is provided with a valve, and the first-stage crushing barrel and the second-stage crushing barrel are respectively provided with a screening device.

S4: detecting the particle size range of the product obtained in the third step, and collecting the qualified titanium dioxide.

In any of the above embodiments, preferably, the steam pressure of the gas stream pulverization in the second step is 1-2 MPa.

In any of the above embodiments, it is preferable that the steam pressure of the jet milling in the third step is 2.6 to 3 MPa.

In any of the above embodiments, preferably, the inorganic treating agent is any one or more of a sodium silicate reagent, a sodium metaaluminate reagent, and a titanyl sulfate reagent.

In any of the above schemes, preferably, the weight ratio of the inorganic treating agent to the titanium dioxide raw material is 0.001-0.1: 1.

In any of the above schemes, preferably, the particle size range of the titanium dioxide particles qualified by the detection in the fourth step is 0.1-0.5 μm.

In any of the above schemes, preferably, the number of the water outlet nozzles is multiple, and the multiple water outlet nozzles are respectively located in the first-stage crushing barrel, the second-stage crushing barrel, the first-stage discharge pipe and the second-stage discharge pipe.

Preferably in any one of the above schemes, fixedly connected with triangular supports in the feeder hopper, fixed mounting has motor one in the triangular supports, an output shaft of motor and (mixing) shaft fixed connection, the (mixing) shaft bottom is arranged in the inlet pipe.

In any of the above schemes, preferably, the screening device includes a second motor and a classifying impeller, an output shaft of the second motor is fixedly connected with the classifying impeller, the classifying impeller corresponds to the discharge pipe, and an impeller gap of the classifying impeller in the first-stage crushing cylinder is larger than an impeller gap of the classifying impeller in the second-stage crushing cylinder.

Compared with the prior art, the invention has the beneficial effects that:

1. through carrying out the first jet milling after smashing crude titanium dioxide through the powder machine earlier, can improve jet milling efficiency and speed, carry out the hierarchical impeller screening in the one-level crushing barrel of once jet milling's titanium white powder and discharge by the one-level discharging pipe, reagent interpolation mouth on the one-level discharging pipe adds inorganic treating agent with the form of spraying, add inorganic treating agent can improve the weatherability of titanium white powder, a passage one end termination wind regime is used for blowing in inorganic treating agent and the titanium white powder after handling in the second grade crushing barrel, refine the smashing once more through the second grade crushing barrel, obtain the titanium white powder that has high weatherability.

2. Through installing one-level crushing barrel and second grade crushing barrel in the organism, can carry out twice jet milling in same rubbing crusher, increase crushing efficiency, the raw materials carries out the jet milling for the first time through high-pressure steam in getting into one-level crushing barrel from the feeder hopper, the titanium white powder after smashing passes through the hierarchical impeller screening in the one-level crushing barrel, the titanium white powder that does not sieve and pass through only needs to smash until can pass through hierarchical impeller in staying one-level crushing barrel, jet milling for making crushing titanium white powder and inorganic processing agent intensive mixing for the first time, the titanium white powder of mixed inorganic processing agent passes through the leading-in second grade crushing barrel of passage guide, it is more meticulous to make titanium white powder kibbling through second grade kibbling, through installing solenoid valve one on the inlet pipe, the flow that the titanium white powder can be controlled to install solenoid valve two on the passage, be convenient for adjust the mass ratio of titanium white powder and high-pressure steam.

3. Through setting up the water pipe and installing a plurality of water spray heads on the water pipe, water spray head is arranged in one-level crushing barrel, second grade crushing barrel, one-level discharging pipe and second grade discharging pipe respectively, can lead to water at the water pipe after rubbing crusher uses, washs in one-level crushing barrel, second grade crushing barrel, one-level discharging pipe and the second grade discharging pipe by water spray head blowout, and convenient next time uses, avoids material pollution, and the sewage after wasing can be discharged through the drain pipe.

Drawings

The drawings are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification.

Fig. 1 is a schematic cross-sectional view of a jet mill according to an embodiment of the present invention.

In the figure: 1. the device comprises a machine body, 2, a feed hopper, 3, a primary crushing barrel, 4, a secondary crushing barrel, 5, a water pipe, 6, a primary discharging pipe, 7, a secondary discharging pipe, 8, a feeding pipe, 9, a motor I, 10, a triangular support frame, 11, a stirring shaft, 12, a solenoid valve I, 13, a solenoid valve II, 14, a water outlet spray head, 15, a high-pressure airflow connecting pipe, 16, a water discharging pipe, 17, a screening device, 1701, a motor II, 1702, a grading impeller, 18, a material guiding pipe, 19 and a reagent adding port.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.

In the description of the present invention, it is to be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships illustrated in the drawings, and are used merely for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

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

For better understanding of the above technical solutions, the technical solutions of the present invention will be described in detail below with reference to the drawings and the detailed description of the present invention.

Example one

S1: crushing the crude titanium dioxide by a powder grinding machine to obtain a titanium dioxide raw material;

s2: pouring the titanium dioxide raw material in the step one into a jet mill for jet milling, wherein the steam pressure of the jet milling is 1 MPa;

s3: blowing the titanium dioxide raw material subjected to airflow crushing in the step two into an airflow crusher for primary airflow crushing, and pouring an inorganic treating agent into the airflow crusher, wherein the steam pressure of the airflow crushing is 2.6MPa, the inorganic treating agent is a sodium silicate reagent, and the weight ratio of the inorganic treating agent to the titanium dioxide raw material is 0.001-0.1: 1;

s4: detecting the particle size range of the product obtained in the third step, and collecting the qualified titanium dioxide, wherein the particle size range of the qualified titanium dioxide is 0.1 mu m.

Example two

S1: crushing the crude titanium dioxide by a powder grinding machine to obtain a titanium dioxide raw material;

s2: pouring the titanium dioxide raw material in the step one into a jet mill for jet milling, wherein the steam pressure of the jet milling is 0.5 MPa;

s3: blowing the titanium dioxide raw material subjected to airflow crushing in the step two into an airflow crusher for primary airflow crushing, and pouring an inorganic treating agent into the airflow crusher, wherein the steam pressure of the airflow crushing is 2.5MPa, the inorganic treating agent is a sodium silicate reagent and a sodium metaaluminate reagent, and the weight ratio of the inorganic treating agent to the titanium dioxide raw material is 0.001-0.006: 1;

s4: detecting the particle size range of the product obtained in the third step, and collecting the qualified titanium dioxide, wherein the particle size range of the qualified titanium dioxide is 0.2 mu m.

EXAMPLE III

S1: crushing the crude titanium dioxide by a powder grinding machine to obtain a titanium dioxide raw material;

s2: pouring the titanium dioxide raw material in the step one into a jet mill for jet milling, wherein the steam pressure of the jet milling is 1.6 MPa;

s3: blowing the titanium dioxide raw material subjected to airflow crushing in the step two into an airflow crusher for primary airflow crushing, and pouring an inorganic treating agent into the airflow crusher, wherein the steam pressure of the airflow crushing is 2.5MPa, the inorganic treating agent is a mixture of a sodium silicate reagent, a sodium metaaluminate reagent and a titanyl sulfate reagent, and the weight ratio of the inorganic treating agent to the titanium dioxide raw material is 0.005-0.15: 1;

s4: detecting the particle size range of the product obtained in the third step, and collecting the qualified titanium dioxide, wherein the particle size range of the qualified titanium dioxide is 0.3 mu m.

Example four

S1: crushing the crude titanium dioxide by a powder grinding machine to obtain a titanium dioxide raw material;

s2: pouring the titanium dioxide raw material in the step one into a jet mill for jet milling, wherein the steam pressure of the jet milling is 1 MPa;

s3: blowing the titanium dioxide raw material subjected to airflow crushing in the step two into an airflow crusher for primary airflow crushing, and pouring an inorganic treating agent into the airflow crusher, wherein the steam pressure of the airflow crushing is 2.5MPa, the inorganic treating agent is a mixture of a sodium silicate reagent and a titanyl sulfate reagent, and the weight ratio of the inorganic treating agent to the titanium dioxide raw material is 0.001-0.1: 1;

s4: detecting the particle size range of the product obtained in the third step, and collecting the qualified titanium dioxide, wherein the particle size range of the qualified titanium dioxide is 0.4 mu m.

EXAMPLE five

S1: crushing the crude titanium dioxide by a powder grinding machine to obtain a titanium dioxide raw material;

s2: pouring the titanium dioxide raw material in the step one into a jet mill for jet milling, wherein the steam pressure of the jet milling is 1.2 MPa;

s3: blowing the titanium dioxide raw material subjected to airflow crushing in the step two into an airflow crusher for primary airflow crushing, and pouring an inorganic treating agent into the airflow crusher, wherein the steam pressure of the airflow crushing is 2MPa, the inorganic treating agent is a sodium metaaluminate reagent, and the weight ratio of the inorganic treating agent to the titanium dioxide raw material is 0.005-0.05: 1;

s4: detecting the particle size range of the product obtained in the third step, and collecting the qualified titanium dioxide, wherein the particle size range of the qualified titanium dioxide is 0.5 mu m.

EXAMPLE six

As shown in figure 1, the jet mill comprises a mill body 1, a feed hopper 2, a primary crushing barrel 3 and a secondary crushing barrel 4, wherein the bottom end of the feed hopper 2 is communicated with a feed pipe 8, a coarse titanium dioxide raw material which is fed into the primary crushing barrel 3 after being primarily crushed by a mill passes through the feed hopper 2 and then enters the primary crushing barrel 3 along with the feed pipe 8, the primary crushing speed of titanium dioxide can be improved, a first electromagnetic valve 12 is installed in the feed pipe 8, the feeding speed of the titanium dioxide raw material can be adjusted by controlling the first electromagnetic valve 12, the ratio of the titanium dioxide raw material to high-pressure steam in the primary crushing barrel 3 is changed, a water pipe 5 is arranged at the top end of the mill body 1, one end of the water pipe 5 is connected with a water source, the other end of the water pipe 5 is inserted into a secondary discharge pipe 7, a water outlet nozzle 14 is arranged at one end of the water pipe 5, and after the water pipe 5 is connected with the water source, the water outlet nozzle 14 sprays water to clean the mill, the device is convenient to use next time and avoids material pollution, the primary crushing barrel 3 is transversely arranged in the machine body 1, the bottom end of the feeding pipe 8 penetrates through the shell of the machine body 1 to be communicated with the primary crushing barrel 3, the primary crushing barrel 3 is used for carrying out primary air flow crushing on titanium white, the primary air flow crushing is used for fully mixing crushed titanium white with an inorganic treating agent, the secondary crushing barrel 4 is vertically arranged in the machine body 1, the secondary crushing barrel 4 is used for carrying out secondary air flow crushing on the titanium white, finer titanium white can be obtained through secondary air flow crushing, the right side of the secondary crushing barrel 4 is communicated with a secondary discharging pipe 7, one end of the secondary discharging pipe 7 penetrates through and extends to the outer side of the machine body 1, the qualified titanium white after crushing and screening is discharged through the secondary discharging pipe 7 for collection and use, and the primary discharging pipe 6 which is vertically placed is fixedly inserted on the primary crushing barrel 3, a reagent adding port 19 is arranged at the top end of the first-stage discharging pipe 6, a high-pressure metering pump is arranged at the reagent adding port 19, a spray-shaped inorganic treating agent is introduced into the first-stage discharging pipe 6 through the high-pressure metering pump, the spray-shaped inorganic treating agent is fully mixed with the first-stage crushed titanium dioxide in the first-stage discharging pipe 6, the inorganic treating agent forms a layer of uniform colorless or white inorganic oxide film on the surface of the titanium dioxide to block the photoactivation point of the titanium dioxide and improve the weather resistance, a transversely-placed material guiding pipe 18 is communicated with the first-stage discharging pipe 6, a second electromagnetic valve 13 is arranged in the material guiding pipe 18, the flow of the titanium dioxide mixed with the inorganic treating agent entering the second-stage crushing barrel 4 can be controlled by controlling the second electromagnetic valve 13, one end of the material guiding pipe 18 is communicated with the second-stage discharging pipe 7, the other end of the material guiding pipe is inserted into the machine body 1 and connected with an air source, one end of the material guiding pipe 18 is communicated with the air source, blow the titanium white powder of mixed inorganic treating agent to in the second grade rubbing crusher 4 through the air current, all be equipped with high-pressure air flow connecting pipe 15 and drain pipe 16 on one-level rubbing crusher 3 and the second grade rubbing crusher 4, put through high-pressure steam through high-pressure air flow connecting pipe 15 for carry out fluid energy milling to the titanium white powder, be used for discharging the sewage behind the clearance rubbing crusher through setting up drain pipe 16, be provided with the valve on the drain pipe 16, all install screening plant 17 in one-level rubbing crusher 3 and the second grade rubbing crusher 4, sieve qualified titanium white powder through screening plant 17, make unqualified titanium white powder stay and continue to smash in the rubbing crusher.

Go out water spray head 14 quantity and be a plurality of, it is a plurality of go out water spray head 14 and be located one-level crushing barrel 3, second grade crushing barrel 4, one-level discharging pipe 6 and second grade discharging pipe 7 respectively, the feed pipe 5 leads to water after rubbing crusher uses, washs in one-level crushing barrel 3, second grade crushing barrel 4, one-level discharging pipe 6 and second grade discharging pipe 7 by 14 blowout of play water spray head, washs the residual material, and convenient next time is used, avoids material pollution.

Fixedly connected with triangular supports frame 10 in feeder hopper 2, fixed mounting has a motor 9 in the triangular supports frame 10, stabilizes and supports motor 9 in feeder hopper 2 through triangular supports frame 10, does not influence the titanium white powder feeding simultaneously, the branch of being equipped with a plurality of slopes on the (mixing) shaft 11 outer wall is equipped with the titanium white powder of being convenient for stir on the (mixing) shaft 11 output shaft, the (mixing) shaft 11 bottom is arranged in inlet pipe 8, drives (mixing) shaft 11 through setting up motor 9 and rotates the titanium white powder to feeder hopper 2 and 8 junctions of inlet pipe and stir, utilizes the branch of slope on the (mixing) shaft 11 to stir titanium white powder, can avoid titanium white powder to pile up in inlet pipe 8, influences the titanium white powder unloading.

The screening device 17 comprises a motor II 1701 and a grading impeller 1702, an output shaft of the motor II 1701 is fixedly connected with the grading impeller 1702, the grading impeller 1702 is driven by the motor II 1701 to rotate to screen the crushed titanium dioxide, the crushed titanium dioxide is continuously crushed in the crushing barrel without passing through the grading impeller 1702 until the crushed titanium dioxide can pass through the grading impeller 1702, the particle size of the titanium dioxide is strictly controlled, the grading impeller 1702 corresponds to a discharge pipe, the impeller gap of the grading impeller 1702 in the first-stage crushing barrel 3 is larger than that of the grading impeller 1702 in the second-stage crushing barrel 4, the first-stage crushing barrel 3 is used for crushing the titanium dioxide for the first time, the titanium dioxide is conveniently and fully mixed with the inorganic treating agent, the second-stage crushing barrel is used for finely crushing the titanium dioxide mixed with the inorganic treating agent, the efficiency is improved, a PLC (programmable logic controller) and an operation panel are further arranged on the crusher, and the PLC is used for controlling the electromagnetic valve I12, The second electromagnetic valve 13, the valve on the water discharge pipe 16, the first motor 9 and the second motor 1701 enable the pulverizer to be intelligent and convenient to operate.

In the steps S1-S4, coarse titanium dioxide is firstly crushed by a powder grinding machine and then poured into a feed hopper 2, a stirring shaft 11 is arranged in the feed hopper 2, the stirring shaft 11 rotates under the drive of a motor I9 to stir the titanium dioxide and prevent the titanium dioxide from being blocked in a feed pipe 8, a PLC controller controls a first electromagnetic valve 12 in the feed pipe 8 to adjust the flow rate of the titanium dioxide in the feed pipe 8, a high-pressure airflow connecting pipe 15 on a primary crushing barrel 3 is communicated with high-pressure steam to carry out primary airflow crushing on the titanium dioxide entering the primary crushing barrel 3, the crushed titanium dioxide is screened by a grading impeller 1702 in the primary crushing barrel 3, the titanium dioxide which is not screened is left in the primary crushing barrel 3 to be continuously crushed, the titanium dioxide which passes through the screening enters a primary discharge pipe 6, and atomized inorganic treating agent is added from a reagent adding port 19 on the primary discharge pipe 6, mixing with the screened titanium dioxide, connecting one end of a material guide pipe 18 with an air source, transmitting the titanium dioxide mixed with the inorganic treating agent to a secondary crushing barrel 4 through air flow, controlling a second electromagnetic valve 13 in the material guide pipe 18 by a PLC controller, adjusting the flow of the titanium dioxide in the material guide pipe 18, connecting a high-pressure air flow connecting pipe 15 on the secondary crushing barrel 4 with high-pressure air flow to carry out secondary air flow crushing on the titanium dioxide mixed with the inorganic treating agent, screening qualified titanium dioxide through a grading impeller 1702 in the secondary crushing barrel 4, discharging a finished product through a secondary discharging pipe 7, leading water to a water pipe 5 after the use of the crusher, spraying the water from a water outlet nozzle 14 to clean the primary crushing barrel 3, the secondary crushing barrel 4, the primary discharging pipe 6 and the secondary discharging pipe 7, discharging the cleaned sewage through a water discharging pipe 16, facilitating the next use and avoiding material pollution.

Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that various changes, modifications and substitutions can be made without departing from the spirit and scope of the invention as defined by the appended claims. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.