Titanium dioxide crude product impurity removing and screening device

Abstract

The utility model relates to a titanium dioxide crude product impurity removing and screening device which is characterized in that a cooling air pipe is installed in the center of a cooling rotary kiln, a plurality of evenly-distributed discharging pipes are installed on the periphery of the cooling air pipe and in the cooling rotary kiln, and a screen drum with a certain length is fixedly installed at the tail end of each discharging pipe. A plurality of first metal alloy magnets and an inclined rotary piece are installed on the inner wall of the tail end of the discharging pipe. Three second metal alloy magnets which are evenly distributed are installed on the same section of the inner wall of the screen drum, and a variable-diameter drum with the diameter gradually decreased is fixedly installed at the end of the screen drum. By means of the rotation characteristic of the cooling rotary kiln, the stainless steel rotary pieces are welded to the inner wall of the discharging pipe, materials can be guided to fall down in a concentrated mode and make full contact with the metal alloy magnets to adsorb impurities, and the materials are screened by the screen drum, fall into a spiral device arranged below an outlet of the cooling rotary kiln and enter a storage bin. And the reducing cylinder is additionally arranged at the front end of the screen cylinder, so that large-particle materials and bricks falling off from the calcining rotary kiln are prevented from entering the storage bin.

Description

Technical Field

[0001] The utility model belongs to the technical equipment field of titanium dioxide production, and particularly relates to an impurity removal and screening device for crude titanium dioxide. Background Art

[0002] In the production process of crude titanium dioxide, the calcination of titanium dioxide is the last process, including the feeding to discharging of the calcination rotary kiln. During this period, the quality of the crude product will be affected by some factors. For example, when the calcination rotary kiln is overhauled, the change of the feeding stop temperature will cause the refractory bricks and the iron at the kiln mouth to fall off, and the feeding screw of the rotary kiln will be oxidized. These will bring certain impurities to the crude product and affect the subsequent treatment and the use of downstream units. Summary of the Invention

[0003] The purpose of the utility model is to solve the problems existing in the prior art and provide an impurity removal and screening device for crude titanium dioxide.

[0004] To achieve the above purpose, the technical solution adopted by the utility model is as follows: an impurity removal and screening device for crude titanium dioxide, including a cooling rotary kiln, characterized in that: a cooling air pipe is installed at the center of the cooling rotary kiln; a plurality of evenly distributed discharge pipes are installed in the cooling rotary kiln outside the cooling air pipe; a sieve cylinder with a certain length is fixedly installed at the end of the discharge pipe; a plurality of first metal alloy magnets and an inclined rotating vane are installed on the inner wall at the end of the discharge pipe; three evenly distributed second metal alloy magnets are installed on the inner wall of the sieve cylinder at the same cross-section, and a reducing cylinder with a gradually decreasing diameter is fixedly installed at the end of the sieve cylinder.

[0005] There are 4 first metal alloy magnets, which are evenly distributed at the same cross-section position on the inner wall at the end of the discharge pipe; the rotating vane is installed at the position of the same cross-section as the first metal alloy magnets.

[0006] The rotating vane is crescent-shaped, with a length of 200 - 300 mm, an inclination angle of 30 - 40 degrees, and the material is stainless steel.

[0007] The diameter of the sieve cylinder is equivalent to the diameter of the discharge pipe, the length of the sieve cylinder is 200 - 250 mm, and the hole specification of the sieve cylinder is 10 mm * 10 mm, which is used for intercepting large particle materials and impurities larger than 10 mm during the rotary kiln calcination process.

[0008] The reducing cylinder is fixed to the sieve cylinder through a stainless steel reinforcement ring.

[0009] A stainless steel plate is fixed on the inner wall of the discharge pipe where the first alloy magnet is installed, and the first alloy magnet is installed and fixed on the stainless steel plate.

[0010] There are 6 discharge pipes.

[0011] The beneficial effect of the utility model is:

[0012] 1. By utilizing the rotational characteristics of the cooling rotary kiln, stainless steel rotating vanes are welded to the inner wall of the discharge pipe, which can guide the material to fall centrally and make full contact with the metal alloy magnets installed in the discharge pipe to adsorb impurities. Then the material passes through the screening of the sieve cylinder and falls into the screw conveyor arranged below the outlet of the cooling rotary kiln and enters the storage bin.

[0013] 2. A sieve cylinder is installed at the discharge end of the cooling kiln to intercept large-particle materials generated during the operation of the calcining rotary kiln in the previous process.

[0014] 3. A stainless steel reducer is installed at the front end of the sieve cylinder to block large-particle materials within the sieve mesh. Along with the self-rotation of the cooling rotary kiln, the materials are crushed by friction on the sieve cylinder, preventing large-particle materials and refractory bricks falling off from the calcining rotary kiln from entering the storage bin and affecting the product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a cross-sectional view of the cooling rotary kiln of the present utility model;

[0016] Figure 2 It is a schematic diagram of the discharge pipe of the present utility model;

[0017] In the figure: 1 - cooling rotary kiln, 2 - cooling air duct, 3 - discharge pipe, 4 - reducer, 5 - sieve cylinder, 6 - first metal alloy magnet, 7 - second metal alloy magnet, 8 - rotating vane. DETAILED DESCRIPTION OF THE INVENTION

[0018] The present utility model will be further described below with reference to the drawings.

[0019] See Figure 1-2 , an impurity removal and screening device for crude titanium dioxide products, comprising a cooling rotary kiln 1, characterized in that: a cooling air duct 2 is installed in the center of the cooling rotary kiln 1, and six discharge pipes 3 are evenly installed around the cooling air duct 2 and in the cooling rotary kiln 1. A sieve cylinder 5 with a certain length is fixedly installed at the end of the discharge pipe 3; a plurality of first metal alloy magnets 6 and an inclined rotating vane 8 are installed on the inner wall at the end of the discharge pipe 3; three second metal alloy magnets 7 are evenly installed on the same cross-section of the inner wall of the sieve cylinder 5, and a reducer 4 with a gradually decreasing diameter is installed at the end of the sieve cylinder 5 through a stainless steel reinforcing ring.

[0020] There are 4 first metal alloy magnets 6, which are evenly distributed at the same cross-section position on the inner wall at the end of the discharge pipe 3; the rotating vane 8 is installed at the same cross-section position as the first metal alloy magnet 6. The rotating vane 8 is crescent-shaped, with a length of 200 - 300 mm and an inclination angle of 30 - 40 degrees, and the material is stainless steel.

[0021] The diameter of the sieve cylinder 5 is equivalent to that of the discharge pipe 3. The length of the sieve cylinder 5 is 200 - 250 mm, and the hole specification of the sieve cylinder 5 is 10 mm * 10 mm, which is used to intercept large particle materials and impurities larger than 10 mm during the rotary kiln calcination process.

[0022] On the inner wall of the discharge pipe 3 where the first alloy magnet 6 is installed, a stainless - steel plate is fixed, and the first alloy magnet 6 is installed and fixed on the stainless - steel plate.

[0023] Working process:

[0024] As Figure 1-2 shown, the materials after calcination in the calcination rotary kiln enter and pass through the inclined cooling rotary kiln 1. The rotation of the cooling rotary kiln 1 makes the materials move from the feed end to the discharge end of the 6 discharge pipes 3. After the materials are cooled by the discharge pipes 3, before falling, through the guidance of the rotating vanes 8 installed on the inner wall of the discharge pipes 3, the materials are concentrated to fully contact with the first metal alloy magnet 6 for the first - time adsorption and removal of material impurities. The particle materials larger than 1 cm are screened in the sieve cylinder 5 and further contact the second metal alloy magnet 7 for impurity removal. The large - particle materials after impurity removal are friction - crushed on the sieve cylinder 5 by the self - rotation of the cooling rotary kiln 1, and then fall from the sieve cylinder 5 into the screw conveyor arranged below the outlet of the cooling rotary kiln and enter the storage bin; the selected refractory bricks and other impurities are timely cleaned by the post personnel. The function of the variable - diameter cylinder 4 is to prevent large - particle materials and other impurities from entering the packaging bin.

Claims

1. A device for removing impurities from crude titanium dioxide, comprising a cooling rotary kiln (1), characterized in that: A cooling air duct (2) is arranged at the center of the cooling rotary kiln (1), and a plurality of evenly distributed discharge pipes (3) are arranged outside the cooling air duct (2) and in the cooling rotary kiln (1), and a screen drum (5) of a certain length is fixedly installed at the end of the discharge pipe (3); a plurality of No. 1 metal alloy magnets (6) and an inclined rotary vane (8) are installed on the inner wall of the end of the discharge pipe (3); three evenly distributed No. 2 metal alloy magnets (7) are installed on the same cross section of the inner wall of the screen drum (5), and a reducing drum (4) with a gradually decreasing diameter is fixedly installed at the end of the screen drum (5).

2. A device for removing impurities from crude titanium dioxide according to claim 1, characterized in that: There are four No. 1 metal alloy magnets (6), which are evenly distributed at the same cross-sectional position on the inner wall at the end of the discharge pipe (3); and the rotary vane (8) is installed at the same cross-sectional position as the No. 1 metal alloy magnets (6).

3. A device for removing impurities from crude titanium dioxide according to claim 1 or 2, characterized in that: The rotary blade (8) is crescent-shaped, has a length of 200-300 mm, an inclination angle of 30-40 degrees, and is made of stainless steel.

4. A device for removing impurities from crude titanium dioxide according to claim 1, characterized in that: The diameter of the sieve drum (5) is equivalent to the diameter of the discharge pipe (3), the length of the sieve drum (5) is 200-250 mm, and the hole specification of the sieve drum (5) is 10 mm*10 mm, which is used to intercept large particles and impurities larger than 10 mm during the rotary kiln calcination process.

5. The device for removing impurities from crude titanium dioxide according to claim 1, characterized in that: The variable diameter cylinder (4) is fixed to the screen cylinder (5) via a stainless steel reinforcement ring.

6. A device for removing impurities from crude titanium dioxide according to claim 1 or 2, characterized in that: The discharge pipe (3) has a stainless steel plate fixed on the inner wall on which the No. 1 metal alloy magnet (6) is installed, and the No. 1 metal alloy magnet (6) is installed and fixed on the stainless steel plate.

7. The device for removing impurities from crude titanium dioxide according to claim 1, characterized in that: There are 6 discharge pipes (3).

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