CN102189033A - High-efficiency anti-oxidation combined grinding machine and grinding method thereof - Google Patents

Abstract

The invention relates to a high-efficiency anti-oxidation combined grinding machine and a grinding method thereof, in particular to an anti-oxidation grinding machine and a grinding method thereof. The invention aims at solving the technical problems that oxidation is easily caused, smashing efficiency is excessively low and the cost is excessively high in a titanium hydride grinding process in the prior art; by adopting the invention, production cost can be effectively reduced, energy source can be saved, and economic benefit can be improved, thus the grinding machine and grinding method are easy to popularize and use. The invention the technical scheme is as follows: a vertical grinding machine and an air flow grinding machine are seamlessly butted, an argon supply station is in charge of providing argon as protective gas and working gas, raw material enters into a grading room to be graded after being smashed by the vertical grinding machine and the air flow grinding machine, the gas is purified and recycled by adopting an argon recycling and purifying device, and a raw material warehouse, a transitional warehouse and a semi-finished product warehouse are adopted in the whole process, thus being effectively isolated from outside air. The grinding machine and the grinding method provided by the invention are mainly applied to anti-oxidation smashing of titanium hydride.

Description

A high-efficiency anti-oxidation combined mill and grinding method thereof

technical field

The invention relates to an anti-oxidation mill and a grinding method thereof, in particular to a combined mill for pulverizing titanium hydride powder and preventing oxidation and a grinding method thereof.

technical background

During the crushing process of titanium hydride powder, conventional crushing equipment cannot guarantee its chemical purity. At present, a single ball mill is usually used for grinding, which has very obvious disadvantages: 1. The titanium hydride powder obtained by grinding has a wide particle size distribution and uneven particle size. This is due to the equipment defects of the ball mill itself, there is a "dead zone" in the ball mill, and it is impossible to obtain more uniform titanium hydride powder. 2. The pulverized fine titanium hydride powder adheres to the inner wall of the ball mill, and it is very easy to react with oxygen, nitrogen and water vapor infiltrated into the air, resulting in an increase in oxygen content. There are also very few research institutes and enterprises that use a single airflow mill for crushing, which also has the following disadvantages: 1. There are strict requirements on the particle size of the material that is fed into the airflow mill, otherwise the crushing efficiency will be greatly reduced. 2. The traditional jet mill is not equipped with a powder classification system, which will cause the fine powder that has been crushed to enter the circulating crushing system again, thereby reducing productivity. 3. The traditional jet mill is not equipped with an argon recovery and purification device, and the polluted argon, or the argon with low purity is re-entered into the circulating crushing system.

Contents of the invention

The purpose of the invention is to solve the technical problems of easy oxidation, low crushing efficiency and high cost in the grinding process of titanium hydride in the prior art. The invention can effectively reduce production costs, save energy and improve economic benefits, and is easy to popularize and use.

In order to achieve the above object, the technical solution adopted in the present invention is: a high-efficiency anti-oxidation combined mill, including a vertical mill, a jet mill, an argon supply station, a classification chamber and an argon recovery and purification device, wherein the jet mill is connected to the vertical mill The rear end of the jet mill is connected with the argon gas supply station, the classification chamber is located at the rear end of the jet mill, and the classification chamber is connected with the vertical mill through an argon gas recovery and purification device.

The vertical mill includes shell one, a crushing device and a grate sieve, wherein the top of the shell one is connected to the lower end of the raw material warehouse through the transition bin one, the crushing device is located in the shell one, the grate screen is installed at the bottom of the shell one, and the shell one An argon inlet is opened on the side wall to connect with the argon recovery and purification device.

The pulverizing device includes a rotating agitator driven by a drive shaft located inside the first casing, and impact grinding balls are placed in the first casing and driven by the rotating agitator.

The jet mill includes a casing two, a raw material inlet and a collision chamber, wherein the upper end of the casing two is the transition bin two, and the upper end of the transition bin two is connected to the lower end of the vertical mill through a semi-finished product warehouse, and is used to receive raw materials transported from the transition bin two There are two raw material inlets, which are located at the end of the second shell. The collision chamber is located inside the second shell and the two raw material inlets are connected to the collision chamber. The direction of the two raw material inlets entering the collision chamber intersects each other. Grading room connection.

A grinding method of a high-efficiency anti-oxidation combined mill, comprising the following steps:

a. Vacuum the raw material storehouse first, and the vacuum degree reaches 10 ^-2 -10 ^-3 Pa within a predetermined time, and then inject argon gas into the raw material storehouse until the pressure of argon gas is higher than 0.05-0.15MPa, and then inject the raw material Storehouse loads titanium hydride powder to be pulverized;

b. Titanium hydride powder enters the vertical mill from transition bin 1, and the large pieces of titanium hydride powder are ground into airflow mills to meet the particle size requirements of the mill powder. In this process, the drive shaft of the vertical mill is mainly used to drive the agitator to rotate, and then drive Impact grinding balls for crushing, meanwhile, use grate sieve for primary screening;

c. Also under the protection of the semi-finished product warehouse and the transition warehouse, the titanium hydride powder to be crushed enters the jet mill for crushing, and the titanium hydride powder to be crushed quickly flows into the collision chamber from two raw material inlets in two different directions, and collides in the collision chamber , so as to achieve the purpose of breaking;

d. Argon carries the crushed titanium hydride powder into the classification chamber quickly for classification treatment. If the titanium hydride powder with the expected particle size is obtained, it will be packaged. Otherwise, it will continue to enter the jet mill circulation crushing system;

e. After the jet mill is pulverized, the generated waste argon will be purified and reused through the argon recovery and purification device, and enter the vertical mill from the argon inlet. At the same time, new argon needs to be continuously supplied to maintain the integrity of the entire system Pressure dynamic balance.

In the above method, in the step c, when the titanium hydride powder to be pulverized enters the jet mill for pulverization, the pressure of the argon gas is higher than 0.25-0.35MPa, at this time, an aerosol of the argon gas carrying the titanium hydride powder is formed, and the continuous gas flow The aerosol quickly flows into the collision chamber from two different directions from the two raw material inlets, and collides in the collision chamber to achieve the purpose of fragmentation, and the pressure difference of argon causes the aerosol to flow out of the collision chamber into the classification chamber.

It can be seen from the various technical characteristics of the present invention above that its advantages are: the present invention connects the vertical mill and the jet mill without gaps, and also through the raw material warehouse, semi-finished product warehouse, transitional warehouse, etc., effectively prevents the direct contact between the raw material and the outside air, And the feeding is uniform in the whole process; argon can be used as a protective gas or a working gas to drive the raw materials in the whole process; in addition, the present invention is equipped with an argon recovery and purification device to recover and purify the argon and use it here , save a lot of energy costs; the invention has a compact structure, can greatly shorten the pulverization time, and effectively prevents the increase of oxygen content in the pulverization process of titanium hydride when argon is used as the protective gas.

Description of drawings

The present invention will compare by accompanying drawing and illustrate in conjunction with the mode of example:

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic cross-sectional view of the vertical mill structure of the present invention;

Fig. 3 is a schematic diagram of the jet mill structure of the present invention;

Reference numeral 1 is a vertical mill 2 is a jet mill 3 is an argon gas supply station

4 is classification chamber 5 is argon recovery and purification device 11 is shell one

12 is the crushing device 13 is the grate sieve 14 is the transition warehouse 15 is the raw material warehouse

16 is an argon inlet 121 is a drive shaft 122 is a rotating agitator

123 is the impact grinding ball 21 is the second shell 22 is the raw material inlet 23 is the collision chamber

24 is the transitional warehouse two 25 semi-finished product warehouse.

Detailed ways

The present invention will be further described below in conjunction with accompanying drawing by embodiment:

preferred embodiment

As shown in Figure 1, the present invention includes a vertical mill, a jet mill, an argon gas supply station, a classification chamber and an argon gas recovery and purification device, wherein the jet mill is connected to the rear end of the vertical mill, and the jet mill is communicated with the argon gas supply station for classification The chamber is located at the back end of the jet mill, and the classification chamber is connected with the vertical mill through an argon gas recovery and purification device.

As shown in Figure 2, the vertical mill includes a shell one, a crushing device and a grate sieve, wherein the top of the shell one is connected to the lower end of the raw material warehouse through the transition storehouse one, the crushing device is located in the shell one, and the bottom of the shell one is installed Grate sieve, an argon inlet is opened on the side wall of the shell to connect with the argon recovery and purification device.

As shown in FIG. 2 , the pulverizing device includes a rotating agitator driven by a drive shaft located inside the first casing, and impact grinding balls are placed in the first casing and driven by the rotating agitator.

As shown in Figure 3, the jet mill includes a housing 2, a raw material inlet and a collision chamber, wherein the upper end of the housing 2 is the transition chamber 2, and the upper end of the transition chamber 2 is connected to the lower end of the vertical mill through a semi-finished product storehouse for receiving materials from the transition chamber. There are two raw material inlets for raw materials delivered from warehouse two, which are located at the end of shell two. The collision chamber is located inside shell two and the two raw material inlets are connected to the collision chamber. The back end outlet of the chamber is connected with the classification chamber.

Its operation process can be described as:

1. As shown in Figure 1-Figure 3, first vacuumize the raw material warehouse, and within a predetermined time, the vacuum degree reaches 10 ^-2 -10 ^-3 Pa; then inject argon into the raw material warehouse until the pressure of argon is greater than 0.05-0.15MPa, then load the titanium hydride powder to be pulverized into the raw material warehouse;

2. Enter the vertical mill from transition chamber 1, and grind the bulk titanium hydride powder into the particle size requirement of the milled powder with argon air flow. In this process, the rotating agitator of the vertical mill is mainly used to drive the impact balls to crush, and at the same time, the grate screen is used for primary screening;

3. Also under the protection of the semi-finished product warehouse and the transitional warehouse, enter the argon jet mill for crushing. At this time, the pressure of the argon needs to be greater than 0.25-0.35MPa to form an aerosol with argon carrying titanium hydride powder; this continuous gas flow The aerosol quickly flows into the collision chamber through two raw material inlets in different directions (as shown in Figure 3), and collides in the collision chamber to achieve the purpose of crushing; due to the pressure difference of argon, the aerosol is forced to flow out of the collision chamber and enter the classification chamber ;

4. The argon gas carries the broken titanium hydride powder into the grading chamber quickly for grading treatment. If the titanium hydride powder with the expected particle size is obtained, it will be packaged; otherwise, it will continue to enter the jet mill circulation crushing system.

5. In the process of argon jet milling, argon is not only a protective gas, but also a working gas. The waste argon (not high in purity) will be purified and reused through the argon recovery and purification device. At the same time, it needs to be continuously replenished with new The argon gas maintains the dynamic balance of the pressure of the whole system.

In the present invention, the impact balls, rotating agitator and grate sieve (as shown in Figure 2) in the vertical mill we use are made of titanium or titanium alloy to ensure the chemical purity of the material.

All features disclosed in this specification, except mutually exclusive features, can be combined in any way.

Any feature disclosed in this specification (including any appended claims, abstract and drawings), unless expressly stated otherwise, may be replaced by alternative features which are equivalent or serve a similar purpose. That is, unless expressly stated otherwise, each feature is one example only of a series of equivalent or similar features.

Claims (6)

1. efficient anti-oxidation combination grinding machine, it is characterized in that comprising that Vertical Mill (1), airflow milling (2), argon gas feed station (3), grading room (4) and argon gas reclaim purification devices (5), wherein airflow milling (2) is connected the rear end of Vertical Mill (1), airflow milling (2) is communicated with argon gas feed station (3), grading room (4) is positioned at the rear end of airflow milling (2), and grading room (4) reclaims purification devices (5) by argon gas and is connected with Vertical Mill (1).

2. a kind of efficient anti-oxidation combination grinding machine according to claim 1, it is characterized in that described Vertical Mill (1) comprises housing one (11), reducing mechanism (12) and bar screen (13), the top of its middle shell one (11) is connected raw material storage (15) lower end by excessive storehouse one (14), reducing mechanism (12) is positioned at housing one (11), bar screen (13) is installed in housing one (11) bottom, offers an argon gas inlet (16) on housing one (11) sidewall and is connected with argon gas recovery purification devices (5).

3. a kind of efficient anti-oxidation combination grinding machine according to claim 2, it is characterized in that described reducing mechanism (12) comprises is positioned at housing one (11) inside, by the rotating mixer (122) that driving shaft (121) drives, impact abrading-ball (123) is positioned in the housing one (11) and by rotating mixer (122) and drives.

4. a kind of efficient anti-oxidation combination grinding machine according to claim 1 and 2, it is characterized in that described airflow milling (2) comprises housing two (21), feed(raw material)inlet (22) and collision cell (23), its middle shell two (21) upper ends are excessive storehouse two (24), excessively two (24) tops, storehouse are connected with the lower end of Vertical Mill (1) by semifinished product warehouse (25), be used for receiving that to carry the feed(raw material)inlet (22) of the raw material of coming from excessive storehouse two (24) be two, be positioned at the end of housing two (21), collision cell (23) is positioned at housing two (21) inside and two feed(raw material)inlets (22) are communicated with collision cell (23), the direction that two feed(raw material)inlets (22) enter in the collision cell (23) is intersected mutually, and the back outlet of collision cell (23) is connected with grading room (4).

5. the Ginding process of an efficient anti-oxidation combination grinding machine is characterized in that comprising the following steps:

A, elder generation vacuumize raw material storage, and in the given time, vacuum reaches 10 ^-2-10 ^-3Pa injects argon gas again in raw material storage, up to the pressure of argon gas during greater than 0.05-0.15MPa, subsequently to the raw material storage titanium hydride powders to be pulverized of packing into;

B, titanium hydride powders enter Vertical Mill by excessive storehouse one, and the titantium hydride powder of bulk is ground to form the granularity requirements that air-flow is grinding into the abrasive dust body, this process, mainly utilize the drive shaft rotating mixer of Vertical Mill, drive then and impact the abrading-ball fragmentation, simultaneously, carry out elementary screening with bar screen;

C, equally at semifinished product warehouse with excessively under the protection of storehouse, titanium hydride powders to be pulverized enters airflow milling and pulverizes, titanium hydride powders to be pulverized, bumps in collision cell by the quick inflow collision cell of two different directions from two feed(raw material)inlets, thereby reaches broken purpose;

D, argon gas carry the titanium hydride powders that is broken and enter grading room fast and carry out classification and handle, as obtain expecting the hydride powder of particle diameter, with its encapsulation, otherwise, will continue to enter airflow milling circulation pulverizing system;

E, after airflow milling is pulverized, the useless argon gas that is produced will reclaim purification devices by argon gas and purify and utilize, enter into Vertical Mill from the argon gas inlet, simultaneously, need the new argon gas of continuous supply, keep the dynamic balance of pressure of whole system.

6. the Ginding process of a kind of efficient anti-oxidation combination grinding machine according to claim 5, it is characterized in that among the described step c, when titanium hydride powders to be pulverized enters the airflow milling pulverizing, the pressure of argon gas is greater than 0.25-0.35MPa, form the aerosol that argon gas carries titanium hydride powders this moment, continuously aerosol flows into collision cell from two feed(raw material)inlets fast by two different directions, in collision cell, bump, thereby reach broken purpose, and the pressure difference of argon gas causes aerosol to force the outflow collision cell to enter into grading room.

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