A low titanium slag dry treatment device and dry treatment process

Abstract

The present invention relates to a low-titanium slag dry treatment device and dry treatment method, the device comprises a cyclone dust collector connected to a titanium tetrachloride production device, the ash outlet of the cyclone dust collector is connected to an ash storage hopper, the outlet of the ash storage hopper is connected to an ash storage tank through a pipeline, and the ash storage hopper is connected to a nitrogen pressurizing device and a pressure relief device; a bag dust collector is connected to the top of the ash storage tank, the gas outlet of the bag dust collector is connected to the inlet of a titanium tetrachloride condenser, the outlet of the titanium tetrachloride condenser is connected to a titanium tetrachloride collection container, and a negative suction system is also connected to the titanium tetrachloride collection container for collecting non-condensable gas; a dust cooling device is connected to the bottom of the ash storage tank, and the outlet of the dust cooling device is connected to a packaging device. The dry treatment method can separate the materials separated by the cyclone dust collector again, and collect the titanium tetrachloride product and the low-titanium slag that can be sold separately. The present invention can solve the problems of high cost and high environmental pressure of wet slag flushing method for low-titanium slag.

Description

Technical Field

[0001] The invention belongs to the technical field of chemical production equipment, and in particular relates to a low-titanium slag dry treatment device and a dry treatment process. Background Art

[0002] In the process of producing titanium tetrachloride by boiling chlorination method, the titanium-containing solid dust particles in the gas phase (titanium tetrachloride gas) component are called low-titanium slag, which are mainly rare metal chlorides such as vanadium, zirconium, and niobium, and residual unreacted rutile, petroleum coke and other components, which have certain recovery value. Because the low-titanium slag after gas-solid separation still has a very high temperature of about 350°C, it is difficult to treat directly. Therefore, the current traditional treatment method is the wet slag flushing method, which first separates the gas phase components through a cyclone dust collector, and then rinses the separated low-titanium slag with circulating water, and then goes through neutralization, filter pressing and other processes to become filter press slag. When using this method to treat low-titanium slag, when producing each ton of titanium tetrachloride, 0.08 tons of calcium hydroxide will be needed, and 0.3 tons of filter press slag will be produced. The filter press slag is a general solid waste with a high calcium content, which further reduces the available components, and the water content is 40%. If it is to be reused, the cost is too high to be treated, and a large amount of high-salt wastewater is difficult to treat. As a result, the current cost of low-titanium slag treatment is very high, and it also creates huge environmental pressure on companies. Summary of the invention

[0003] The purpose of the present invention is to provide a low-titanium slag dry treatment device and dry treatment process to reduce the low-titanium slag treatment cost. The collected low-titanium slag can be sold to turn waste into treasure, create profits for the enterprise, and greatly reduce the environmental protection pressure of the enterprise.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the present invention is: a low-titanium slag dry processing device, including a cyclone dust collector connected to a titanium tetrachloride production equipment, the ash outlet of the cyclone dust collector is connected to an ash storage hopper, the outlet of the ash storage hopper is connected to an ash storage tank through a pipeline, and the ash storage hopper is also connected to a nitrogen pressurizing device and a pressure relief device; the top of the ash storage tank is also connected to a bag dust collector, and the material entering the ash storage tank passes through the bag dust collector, and the low-titanium slag in the material is intercepted into the ash storage tank; the gas exhaust port of the bag dust collector is connected to the inlet of a titanium tetrachloride condenser, and the outlet of the titanium tetrachloride condenser is connected to a titanium tetrachloride collecting container, and a vacuum system is also connected to the titanium tetrachloride collecting container for collecting non-condensable gases; the bottom of the ash storage tank is connected to a dust cooling device, and the outlet of the dust cooling device is connected to a packaging device.

[0005] The nitrogen pressurizing device comprises a nitrogen pressurizing pipe, a nitrogen pressurizing valve and a nitrogen pressurizing device.

[0006] The pressure relief device comprises a pressure relief pipeline connected to the ash storage hopper and a pressure relief valve installed on the pressure relief pipeline, and the pressure relief pipeline is connected to the negative pressure extraction system.

[0007] An upper ash valve is arranged between the ash storage hopper and the cyclone dust collector, and a lower ash valve is arranged at the bottom of the ash storage hopper.

[0008] An ash discharge valve is provided between the ash storage tank and the dust cooling device.

[0009] The ash discharge valve is a star-shaped valve.

[0010] A low-titanium slag dry treatment process, the process is carried out using the low-titanium slag dry treatment device, and the specific steps are: first, the high-temperature low-titanium slag separated by the cyclone dust collector and the high-temperature titanium tetrachloride gas mixed therein enter the ash storage hopper through the upper ash valve; then, the upper ash valve is closed, and the nitrogen pressure valve is opened to pressurize the ash storage hopper. After the pressurization is completed, the nitrogen pressure valve is closed and the lower ash valve is opened. At this time, the material in the ash storage hopper is blown into the ash storage tank under nitrogen pressure, and then the lower ash valve is closed; after the material enters the ash storage tank, a part of the high-temperature low-titanium slag dust settles to the bottom of the tank due to its own weight, and the rest of the high-temperature low-titanium slag dust enters the top of the ash storage tank with the airflow. After passing through the bag filter at the bottom, the slag is filtered by the filter bag of the bag filter and falls to the bottom of the ash storage tank. The gas in the material enters the titanium tetrachloride condenser from the gas outlet of the bag filter. The titanium tetrachloride gas in the gas is condensed into titanium tetrachloride liquid and collected by the titanium tetrachloride collecting container connected to the outlet of the titanium tetrachloride condenser. The non-condensable gas in the gas enters the titanium tetrachloride collecting container with the titanium tetrachloride liquid and is collected by the vacuum system. Finally, the ash discharge valve at the bottom of the ash storage tank is opened to discharge the high-temperature low-titanium slag deposited in the ash storage tank to the dust cooling device below for cooling. The cooled low-titanium slag is sent to the packaging device to complete packaging.

[0011] The dust cooling device cools the low-titanium slag to below 45°C.

[0012] After the material in the ash storage hopper is blown to the ash storage tank, the pressure relief valve and the negative pressure extraction system connected to the pressure relief pipeline are opened while the ash lowering valve is closed to exhaust air and relieve pressure in the ash storage hopper to maintain negative pressure or zero pressure in the ash storage hopper.

[0013] The beneficial effects of the present invention are as follows: the present invention performs secondary gas-solid separation on the low-titanium slag, and after cooling the separated dust, the dust can be collected in a dry state without the need for a large amount of water, because no new impurities are introduced during the collection, and the dust is in a dry state, so it has a high recovery value and can be sold to the outside, thus turning waste into treasure and generating income for the enterprise; the present invention condenses the separated gas to collect the titanium tetrachloride therein, reduces the loss of the titanium tetrachloride product, and further increases the titanium tetrachloride yield.

[0014] According to calculations, after an enterprise with an annual output of 80,000 tons of titanium tetrachloride adopts the present invention, the weight of low-titanium slag that can be collected each year can reach 4,320 tons, and the takeaway can generate an annual income of 216,000 yuan; the annual amount of calcium hydroxide used for neutralization can be reduced by 4,800 tons, saving 3.12 million yuan in costs each year; the annual amount of filter press residue generated can be reduced by 12,000 tons, and the annual filter press residue treatment cost can be reduced by 840,000 yuan; the operating and maintenance costs of processing equipment such as neutralization and filter pressing can be reduced by 80%, saving 360,000 yuan each year; therefore, the present invention can significantly reduce the environmental protection pressure of the enterprise and help the enterprise achieve the goal of a green factory. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the present invention;

[0016] Markings in the figure: 1. Cyclone dust collector, 2. Upper ash valve, 3. Nitrogen pressurizing valve, 4. Pressure relief valve, 5. Ash storage hopper, 6. Lower ash valve, 7. Ash storage tank, 8. Bag dust collector, 9. Titanium tetrachloride condenser, 10. Titanium tetrachloride collecting container, 11. Negative extraction system, 12. Star-shaped ash unloading valve, 13. Dust cooling device, 14. Packaging device. DETAILED DESCRIPTION

[0017] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments, but they are not intended to limit the invention in any way.

[0018] Referring to the accompanying drawings, a low-titanium slag dry processing device includes a cyclone dust collector 1. During the production of titanium tetrachloride, high-temperature titanium tetrachloride gas enters the cyclone dust collector 1 for gas-solid separation to obtain low-titanium slag; the ash outlet of the cyclone dust collector 1 is provided with a set of ash storage hoppers 5 specially used for temporary ash storage and avoiding secondary dust entrainment, the inlet of the ash storage hopper 5 is provided with an upper ash valve 2, and the outlet is provided with a lower ash valve 6, and the ash storage amount is controlled by the upper ash valve 2 and the lower ash valve 6; a nitrogen pressurizing pipe and a pressure relief pipeline are provided on the ash storage hopper 5 to ensure that the low-titanium slag in the cyclone dust collector 1 can smoothly enter and discharge the ash storage hopper 5, the nitrogen pressurizing pipe is connected to the nitrogen pressurizing equipment, and is provided with a nitrogen pressurizing valve 3, a pressure relief valve 4 is provided on the pressure relief pipeline, and the pressure relief pipeline is connected with a negative suction system.

[0019] The outlet at the bottom of the ash storage hopper 5 is connected to the ash storage tank 7 through a pipeline, and the lower ash valve 6 is arranged on one end of the pipeline close to the ash storage hopper 5.

[0020] The ash storage tank 7 is connected to a bag filter 8, which has a material inlet at the bottom and a gas outlet at the top. The material inlet is connected to the ash storage tank 7. The materials entering the ash storage tank 7 include titanium tetrachloride gas, nitrogen and low-titanium slag. A part of small-mass particles in these materials can enter the bag filter 8 through the material inlet along with the airflow, and then after secondary gas-solid separation in the bag filter 8, these small-mass particles are blocked by the filter bag and finally fall down and drop to the bottom of the ash storage tank 7 through the material inlet.

[0021] The gas outlet of the bag filter 8 is connected to the inlet of the titanium tetrachloride condenser 9, and the outlet of the titanium tetrachloride condenser 9 is connected to the titanium tetrachloride collecting container 10. The titanium tetrachloride collecting container 10 is also connected to a vacuum system 11 to collect non-condensable gas in the gas.

[0022] The bottom outlet of the ash storage tank 7 is connected to the inlet of the dust cooling device 13, and a star-shaped ash discharge valve 12 is installed at the bottom outlet of the ash storage tank 7. The outlet of the dust cooling device 13 is connected to a set of packaging devices 14 to package the cooled low-titanium slag for easy sale.

[0023] The dust cooling device 13 and the packaging device 14 are both existing devices in the art, and their structures and uses are well known to those skilled in the art, so they are not described in detail here.

[0024] The process method for dry treatment of low-titanium slag using the device of the present invention is as follows: first, the high-temperature low-titanium slag separated by the cyclone dust collector 1 and the high-temperature titanium tetrachloride gas mixed therein enter the ash storage hopper 5 through the upper ash valve 2; then, the upper ash valve 2 is closed, and the nitrogen pressurizing valve 3 is opened to pressurize the ash storage hopper 5. After the pressurization is completed, the nitrogen pressurizing valve 3 is closed, and the lower ash valve 6 is opened. At this time, since the pressure relief valve 4 is in a closed state, the material in the ash storage hopper 5 is blown into the ash storage tank 7 under nitrogen pressure, and then the lower ash valve 6 is closed; after the material enters the ash storage tank 7, a part of the high-temperature low-titanium slag particles with larger weight settle to the bottom of the tank due to their own weight, and the remaining high-temperature low-titanium slag particles with smaller weight enter the bag dust collector 8 with the air flow for Gas-solid separation, so that the high-temperature low-titanium slag in the material can be trapped in the ash storage tank 7, the gas in the material enters the titanium tetrachloride condenser 9 from the gas outlet of the bag filter 8, the titanium tetrachloride gas in the gas is condensed into titanium tetrachloride liquid, and is collected by the titanium tetrachloride collecting container 10 connected to the outlet of the titanium tetrachloride condenser 9, and the non-condensable gas in the gas enters the titanium tetrachloride collecting container 10 with the titanium tetrachloride liquid and is collected by the negative suction system 11; when the material level in the ash storage tank 7 reaches the designed position, the star-shaped ash discharge valve 12 at the bottom of the ash storage tank 7 is opened, and the high-temperature low-titanium slag therein is discharged to the dust cooling device 13 below for cooling, and the low-titanium slag cooled to below 45°C is sent to the packaging device 14 to complete packaging.

[0025] The provision of the ash storage tank 7 in the present invention can prevent materials from directly entering the bag filter 8 and clogging the filter bag or the exhaust pipe, and the low-titanium slag in the ash storage tank 7 has a certain material level, which can prevent the gas from entering the dust cooling device 13 below.

[0026] In order to ensure continuous processing, after the material in the ash hopper 5 is blown to the ash storage tank 7, the lower ash valve 6 is closed and the pressure relief valve 4 and the negative pressure extraction system connected to the pressure relief pipeline are opened to evacuate the air and relieve the pressure in the ash hopper 5 so that negative pressure or zero pressure is maintained in the ash hopper 5. In this way, the material can smoothly enter the ash hopper 5. After the pressure relief is completed, the pressure relief valve 4 is closed.

[0027] After the implementation of the present invention, the problems of high cost and great environmental pressure in the wet slag flushing method for treating low-titanium slag can be solved. Experimental verification shows that the dry collection of low-titanium slag achieved by the present invention can save up to 4.5 million yuan in low-titanium slag treatment costs for an enterprise with an annual output of 80,000 tons of titanium tetrachloride, significantly reducing the environmental pressure of the enterprise.

[0028] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit the same. Those skilled in the art should understand that the specific implementation modes of the present invention may be modified or replaced by equivalents with reference to the above embodiments. Any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention are within the scope of protection of the pending claims.

Claims

1. A low-titanium slag dry treatment process, using a low-titanium slag dry treatment device, the device includes a cyclone dust collector connected to a titanium tetrachloride production device, characterized in that: The low-titanium slag is obtained by titanium tetrachloride gas entering a cyclone dust collector for gas-solid separation. The ash outlet of the cyclone dust collector is connected to an ash storage hopper, and the outlet of the ash storage hopper is connected to an ash storage tank through a pipeline. The ash storage hopper is also connected to a nitrogen pressurizing device and a pressure relief device; the ash storage tank and the lower ash valve are connected through a connecting pipe, and the connecting pipe is connected to the side wall of the ash storage tank and penetrates into the interior of the ash storage tank. The top of the ash storage tank is also connected to a bag dust collector, and a material inlet is provided at the bottom of the bag dust collector, and a gas exhaust port is provided at the top. The material inlet and the storage The ash tank is connected, and the materials entering the ash tank include titanium tetrachloride gas, nitrogen and low-titanium slag. After the materials entering the ash tank pass through the bag filter, the low-titanium slag in the materials is intercepted in the ash tank; the gas outlet of the bag filter is connected to the inlet of the titanium tetrachloride condenser, and the outlet of the titanium tetrachloride condenser is connected to the titanium tetrachloride collection container, and the titanium tetrachloride collection container is also connected to a negative suction system for collecting non-condensable gas; the bottom of the ash tank is connected to a dust cooling device, and the outlet of the dust cooling device is connected to a packaging device; A low-titanium slag dry treatment process, the specific steps are: first, the high-temperature low-titanium slag separated by the cyclone dust collector and the high-temperature titanium tetrachloride gas mixed therein enter the ash storage hopper through the upper ash valve; then, the upper ash valve is closed, and the nitrogen pressure valve is opened to pressurize the ash storage hopper. After the pressurization is completed, the nitrogen pressure valve is closed, and the lower ash valve is opened. At this time, the material in the ash storage hopper is blown into the ash storage tank under nitrogen pressure, and then the lower ash valve is closed; after the material enters the ash storage tank, a part of the high-temperature low-titanium slag dust settles to the bottom of the tank due to its own weight, and the rest of the high-temperature low-titanium slag dust enters the bag dust collector on the top of the ash storage tank with the air flow and is filtered by the filter bag of the bag dust collector The gas in the material falls to the bottom of the ash storage tank, and enters the titanium tetrachloride condenser from the gas outlet of the bag filter. The titanium tetrachloride gas in the gas is condensed into titanium tetrachloride liquid, and is collected by the titanium tetrachloride collecting container connected to the outlet of the titanium tetrachloride condenser. The non-condensable gas in the gas enters the titanium tetrachloride collecting container with the titanium tetrachloride liquid and is collected by the vacuum system; finally, the ash discharge valve at the bottom of the ash storage tank is opened, and the high-temperature low-titanium slag deposited in the ash storage tank is discharged to the dust cooling device below for cooling. The cooled low-titanium slag is sent to the packaging device for packaging; the dust cooling device cools the low-titanium slag to below 45°C.

2. A low titanium slag dry treatment process according to claim 1, characterized in that: The nitrogen pressurizing device comprises a nitrogen pressurizing pipe, a nitrogen pressurizing valve and a nitrogen pressurizing device.

3. The low titanium slag dry treatment process according to claim 1, characterized in that: The pressure relief device comprises a pressure relief pipeline connected to the ash storage hopper and a pressure relief valve installed on the pressure relief pipeline, and the pressure relief pipeline is connected to the negative pressure extraction system.

4. The low titanium slag dry treatment process according to claim 1, characterized in that: An upper ash valve is arranged between the ash storage hopper and the cyclone dust collector, and a lower ash valve is arranged at the bottom of the ash storage hopper.

5. The low titanium slag dry treatment process according to claim 1, characterized in that: An ash discharge valve is provided between the ash storage tank and the dust cooling device.

6. A low titanium slag dry treatment process according to claim 5, characterized in that: The ash discharge valve is a star valve.

7. The low titanium slag dry treatment process according to claim 1, characterized in that: After the material in the ash storage hopper is blown to the ash storage tank, the pressure relief valve and the negative pressure extraction system connected to the pressure relief pipeline are opened while the ash lowering valve is closed to exhaust air and relieve pressure in the ash storage hopper to maintain negative pressure or zero pressure in the ash storage hopper.

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