Vanadium removal device for titanium dioxide production through chlorination process

Abstract

The utility model discloses a vanadium removal device for producing titanium dioxide by a chlorination process, which comprises a vanadium removal reactor, a vanadium removal tower, a vanadium removal reboiler, a reflux tank, a first inspection tank, a second inspection tank and a vanadium removal condenser, and the vanadium removal reboiler is connected with the vanadium removal tower through a mineral oil adding assembly. The online vanadium analyzer is reasonable in structural design, the online vanadium analyzer is additionally arranged on the pipeline from the titanium tetrachloride outlet of the vanadium removal reboiler to the vanadium removal tower, meanwhile, the pipeline sight glass and the monitoring camera are additionally arranged on the feeding pipeline from the return tank to the inspection tank, and real-time data and monitoring pictures of the online vanadium analyzer are transmitted to the central control room. And central control room personnel monitor the vanadium content of the material at the outlet of the vanadium removal reboiler and the chromaticity of a refined product in real time, so that the problem of control lag caused by untimely discovery is solved, and accurate control on the addition amount of mineral oil is realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to titanium dioxide production technical field especially relates to a vanadium removal device of titanium dioxide production of chlorination method. BACKGROUND

[0002] In the process of preparing rutile titanium dioxide by chlorination method, low colority (≤8mg / L) titanium tetrachloride is needed, and to produce the required titanium tetrachloride, the crude titanium tetrachloride produced by the chlorination reactor needs to be refined by removing vanadium. The most widely used and economically beneficial vanadium removal method in the industry is mineral oil vanadium removal. By adding mineral oil to the crude titanium tetrachloride and heating, the insoluble solid impurities in the crude titanium tetrachloride and vanadyl chloride are removed. The evaporated titanium tetrachloride vapor is then cooled to obtain the refined titanium tetrachloride required for the production of titanium dioxide.

[0003] The most important control index of the above refining scheme is the amount of mineral oil added. If the amount of mineral oil added is too small, vanadyl chloride cannot be completely eliminated, resulting in yellow-green titanium tetrachloride. If the amount of mineral oil added is too much, it will cause the titanium tetrachloride to turn yellow and dark, and the excess mineral oil will be sent back to the condensation process with the slurry, which will increase the viscosity of the material and increase the probability of clogging the spiral plate heat exchanger.

[0004] The current method of controlling the amount of mineral oil added is to take samples from the outlet of the vanadium removal reboiler (once every two hours) to test the vanadium content of the crude titanium tetrachloride, and to take samples from the reflux tank every half hour to manually check the colority. The method of manually sampling and checking the colority to determine whether the amount of mineral oil added is reasonable has a lag, and the manual judgment is affected by factors such as the light of the on-site environment, the cleanliness of the sampling container, etc. The method of sampling and testing the vanadium content from the outlet of the vanadium removal reboiler also has a lag and cannot guide production in a timely manner. Therefore, we designed a vanadium removal device for the production of titanium dioxide by chlorination method. UTILITY MODEL CONTENTS

[0005] The utility model aims at solving the problems in the prior art and provides a vanadium removal device for the production of titanium dioxide by chlorination method. The utility model adds an online vanadium analyzer to the titanium tetrachloride outlet pipeline of the vanadium removal reboiler, and adds a pipeline sight glass and a monitoring camera to the feeding pipeline from the reflux tank to the test tank. The real-time data of the online vanadium analyzer and the monitoring image are transmitted to the central control room, and the personnel in the central control room monitor the vanadium content of the material at the outlet of the vanadium removal reboiler and the colority of the refined product in real time, solve the control lag problem caused by the delay in discovery, and realize accurate control of the amount of mineral oil added.

[0006] In order to achieve the above purpose, the utility model adopts the following technical scheme:

[0007] The device for removing vanadium in the production of titanium dioxide by chlorination method comprises a vanadium removal reactor, a vanadium removal tower, a vanadium removal reboiler, a reflux tank, a first inspection tank, a second inspection tank and a vanadium removal condenser, the vanadium removal reactor is connected with the vanadium removal reboiler through a first connecting pipe, the vanadium removal reboiler is connected with the vanadium removal tower through a mineral oil adding assembly, the mineral oil adding assembly is provided with an online vanadium analyzer for continuously and online detecting the vanadium content in titanium tetrachloride, the vanadium removal tower is connected with the vanadium removal condenser through a second connecting pipe, the vanadium removal condenser is connected with the reflux tank through a third connecting pipe, the reflux tank is connected with the first inspection tank and the second inspection tank through a monitoring assembly for monitoring the color of titanium tetrachloride, and the first inspection tank and the second inspection tank are jointly provided with a conveying pipe at the discharge end.

[0008] Preferably, the mineral oil adding assembly comprises a fourth connecting pipe connected between the vanadium removal reboiler and the vanadium removal tower, the online vanadium analyzer is installed on the fourth connecting pipe, a mineral oil adding pipe in communication with the fourth connecting pipe is installed on the fourth connecting pipe, and a first sampling pipe is installed on the fourth connecting pipe.

[0009] Preferably, control valves are installed on the mineral oil adding pipe and the first sampling pipe.

[0010] Preferably, the monitoring assembly comprises a fifth connecting pipe installed at the discharge end of the reflux tank and a sixth connecting pipe jointly installed at the feeding end of the first inspection tank and the second inspection tank, a pipeline sight glass is installed between the fifth connecting pipe and the sixth connecting pipe, a second sampling pipe is installed on the pipeline sight glass, a screw cap is sealingly connected to the end of the second sampling pipe, and a monitoring camera opposite to the pipeline sight glass is installed below the reflux tank.

[0011] Preferably, the pipeline sight glass is detachably connected with the fifth connecting pipe and the sixth connecting pipe through flanges.

[0012] Preferably, a transparent observation window is installed through the screw cap.

[0013] Compared with the prior art, the device for removing vanadium in the production of titanium dioxide by chlorination method has the following beneficial effects:

[0014] 1. The device for removing vanadium in the production of titanium dioxide by chlorination method, the vanadium analyzer is added at the outlet of the vanadium removal reboiler, the vanadium content in the crude titanium tetrachloride of the vanadium removal system is monitored in real time, the data transmitted back by the online vanadium analyzer is used to adjust the amount of mineral oil added by the middle control refining post, and the accurate control of the amount of mineral oil added is realized.

[0015] 2. The device for removing vanadium in the production of titanium dioxide by chlorination method, the sight glass and the monitoring camera are added to the pipeline of the refined titanium tetrachloride to realize remote monitoring, the real-time supervision of the color of titanium tetrachloride is realized, and the amount of mineral oil added is adjusted in time according to the color change. BRIEF DESCRIPTION OF DRAWINGS

[0016] Figure 1 A structure schematic view of a vanadium removal device for producing titanium dioxide by chlorination method is provided in the utility model.

[0017] Figure 2 A main view plane structure schematic view of a vanadium removal device for producing titanium dioxide by chlorination method is provided in the utility model.

[0018] Figure 3 A Figure 2 structure schematic view is provided in the utility model.

[0019] Figure 4 A flow process schematic view of a vanadium removal device for producing titanium dioxide by chlorination method is provided in the utility model.

[0020] In the drawing: 1, vanadium removal reactor; 101, first connecting pipe; 2, vanadium removal tower; 201, second connecting pipe; 3, vanadium removal reboiler; 301, fourth connecting pipe; 302, mineral oil adding pipe; 303, first sampling pipe; 4, online vanadium analyzer; 5, reflux tank; 6, first inspection tank; 7, second inspection tank; 8, monitoring assembly; 801, fifth connecting pipe; 802, pipe sight glass; 803, second sampling pipe; 804, screw cap; 805, monitoring camera; 806, sixth connecting pipe; 9, vanadium removal condenser; 901, third connecting pipe; 10, conveying pipe. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments.

[0022] Referring to Figures 1-4 A vanadium removal device for producing titanium dioxide by chlorination method, comprising a vanadium removal reactor 1, a vanadium removal tower 2, a vanadium removal reboiler 3, a reflux tank 5, a first inspection tank 6, a second inspection tank 7 and a vanadium removal condenser 9, the vanadium removal reactor 1 is provided with a feeding pipe and a discharging pipe, crude titanium tetrachloride is sent to the vanadium removal reactor 1 from the condensing process through the feeding pipe, the vanadium removal reactor 1 and the vanadium removal reboiler 3 are connected through a first connecting pipe 101, a pump body is installed in the vanadium removal reactor 1, which can pump crude titanium tetrachloride from the vanadium removal reactor 1 to the vanadium removal reboiler 3 for heating;

[0023] The mineral oil adding assembly is connected between the vanadium removal reboiler 3 and the vanadium removal tower 2, and an online vanadium analyzer 4 for continuously and online detecting the vanadium content in titanium tetrachloride is arranged on the mineral oil adding assembly. The mineral oil adding assembly comprises a fourth connecting pipe 301 connected between the vanadium removal reboiler 3 and the vanadium removal tower 2. The titanium tetrachloride heated by the vanadium removal reboiler 3 is conveyed into the vanadium removal tower 2 through the cooperation of a pump and the fourth connecting pipe 301. The online vanadium analyzer 4 is arranged on the fourth connecting pipe 301. The online vanadium analyzer 4 continuously and online detects the vanadium content in titanium tetrachloride. The fourth connecting pipe 301 is provided with a mineral oil adding pipe 302 in communication therewith. The data fed back by the online vanadium analyzer 4 can be used to adjust the amount of mineral oil added through the mineral oil adding pipe 302 to control the vanadium content to be 20-40 ppm. The fourth connecting pipe 301 is provided with a first sampling pipe 303 for sampling titanium tetrachloride. Control valves are arranged on the mineral oil adding pipe 302 and the first sampling pipe 303 to control the opening and closing thereof.

[0024] The vanadium removal tower 2 is connected with the vanadium removal condenser 9 through a second connecting pipe 201. The titanium tetrachloride gas can enter the vanadium removal condenser 9 from the top of the vanadium removal tower 2 through the cooperation of the second connecting pipe 201 and a pump. The vanadium removal condenser 9 is connected with the backflow tank 5 through a third connecting pipe 901. The backflow tank 5 is connected with the first inspection tank 6 and the second inspection tank 7 through a monitoring assembly 8 for monitoring the color of titanium tetrachloride. The monitoring assembly 8 comprises a fifth connecting pipe 801 arranged at the discharge end of the backflow tank 5 and a sixth connecting pipe 806 arranged at the feed end of the first inspection tank 6 and the second inspection tank 7. A pipeline sight glass 802 is arranged between the fifth connecting pipe 801 and the sixth connecting pipe 806. The pipeline sight glass 802 is detachably connected with the fifth connecting pipe 801 and the sixth connecting pipe 806 through flanges, so that the pipeline sight glass 802 can be removed for cleaning after work is completed. The pipeline sight glass 802 is sealingly connected with the fifth connecting pipe 801 and the sixth connecting pipe 806 to avoid leakage. A second sampling pipe 803 is arranged on the pipeline sight glass 802. A screw cap 804 is sealingly connected to the end of the second sampling pipe 803. The titanium tetrachloride can be sampled through the second sampling pipe 803 by removing the screw cap 804 from the second sampling pipe 803. A transparent observation window is arranged through the screw cap 804. The transparent observation window can reduce the influence on a monitoring camera 805, so that the monitoring camera 805 can continuously monitor. The monitoring camera 805 is arranged below the backflow tank 5 opposite to the pipeline sight glass 802. The monitoring camera 805 can continuously monitor the color change of titanium tetrachloride in cooperation with the pipeline sight glass 802.

[0025] The first inspection tank 6 and the second inspection tank 7 are provided with a delivery pipe 10 at the discharge end. The liquid titanium tetrachloride can be delivered to an intermediate tank area for storage through a pump and the delivery pipe 10.

[0026] The utility model discloses a function principle can be set forth through the following operation mode:

[0027] In the utility model, crude titanium tetrachloride is sent to the vanadium removal reactor 1 by the condensation procedure, then is pumped from the vanadium removal reactor 1 to the vanadium removal reboiler 3 and is heated, after being heated, the crude titanium tetrachloride is sent to the vanadium removal tower 2 after adding mineral oil through mineral oil adding pipe 302, the vanadium content in the crude titanium tetrachloride is continuously detected by online vanadium analyzer 4 in this process, and the vanadium content in the crude titanium tetrachloride can be sampled according to the use demand through first sampling pipe 303, the titanium tetrachloride gas enters the vanadium removal condenser 9 from the top of the vanadium removal tower 2, is condensed into liquid titanium tetrachloride in the vanadium removal condenser 9 and enters the reflux tank 5, then enters the first inspection tank 6 or the second inspection tank 7 through pipe sight glass 802, and is sent to the intermediate tank area storage through pump and conveying pipe 10 again by the first inspection tank 6 or the second inspection tank 7, and the liquid titanium tetrachloride passing through pipe sight glass 802 can be continuously monitored by monitoring camera 805;

[0028] The refining system is started and stopped according to the operation procedure, the central control refining post adjusts the mineral oil adding amount according to the data transmitted back by online vanadium analyzer 4, controls the vanadium content to be 20-40ppm, and simultaneously, the central control refining post carefully observes the monitoring picture of monitoring camera 805, when the vanadium content in the titanium tetrachloride is normal, the picture color of monitoring camera 805 is colorless and transparent, when the titanium tetrachloride in pipe sight glass 802 appears color change, the on-site personnel are contacted in time to open screw cap 804 and sample and observe the titanium tetrachloride through second sampling pipe 803 and send for inspection, and if the vanadium content in the titanium tetrachloride does not reach the standard, the mineral oil adding amount is adjusted in time according to the detection result.

[0029] The above only for the utility model preferred specific implementation, but the protection scope of the utility model is not limited to this, any skilled in the art technical personnel in the utility model disclosed technical range, according to the utility model technical scheme and the utility model concept are equivalent to replace or change, all should be covered in the protection scope of the utility model.

Claims

1. A vanadium removal device for producing titanium dioxide by a chloride process, comprising a vanadium removal reactor (1), a vanadium removal tower (2), a vanadium removal reboiler (3), a reflux tank (5), a first inspection tank (6), a second inspection tank (7), and a vanadium removal condenser (9), characterized in that: The vanadium removal reactor (1) is connected to the vanadium removal reboiler (3) via a first connecting pipe (101), the vanadium removal reboiler (3) is connected to the vanadium removal tower (2) via a mineral oil addition assembly, the mineral oil addition assembly is provided with an online vanadium analyzer (4) for continuously online detecting the vanadium content in titanium tetrachloride, the vanadium removal tower (2) is connected to the vanadium removal condenser (9) via a second connecting pipe (201), the vanadium removal condenser (9) is connected to the reflux tank (5) via a third connecting pipe (901), the reflux tank (5) is connected to the first inspection tank (6) and the second inspection tank (7) via a monitoring assembly (8) for monitoring the color of titanium tetrachloride, and a conveying pipe (10) is commonly installed at the discharge ends of the first inspection tank (6) and the second inspection tank (7).

2. The vanadium removal device for producing titanium dioxide by the chloride process according to claim 1, characterized in that: The mineral oil addition assembly comprises a fourth connecting pipe (301) connected between the vanadium removal reboiler (3) and the vanadium removal tower (2); the online vanadium analyzer (4) is installed on the fourth connecting pipe (301); a mineral oil addition pipe (302) communicating with the fourth connecting pipe (301) is installed on the fourth connecting pipe (301); and a first sampling pipe (303) is installed on the fourth connecting pipe (301).

3. The vanadium removal device for producing titanium dioxide by the chloride process according to claim 2, characterized in that: Control valves are installed on the mineral oil addition pipe (302) and the first sampling pipe (303).

4. The vanadium removal device for producing titanium dioxide by the chloride process according to claim 1, characterized in that: The monitoring assembly (8) comprises a fifth connecting pipe (801) installed at the discharge end of the reflux tank (5) and a sixth connecting pipe (806) installed on the feed ends of the first inspection tank (6) and the second inspection tank (7), a pipeline sight glass (802) is installed between the fifth connecting pipe (801) and the sixth connecting pipe (806), a second sampling tube (803) is installed on the pipeline sight glass (802), and the end of the second sampling tube (803) is sealed with a screw cap (804), and a monitoring camera (805) is installed below the reflux tank (5) and opposite to the pipeline sight glass (802).

5. The vanadium removal device for producing titanium dioxide by the chloride process according to claim 4, characterized in that: The pipeline sight glass (802) is detachably connected to the fifth connecting pipe (801) and the sixth connecting pipe (806) via flanges.

6. The vanadium removal device for producing titanium dioxide by the chloride process according to claim 4, characterized in that: A transparent observation window is installed through the rotary cover (804).

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