CN114380328A - Titanium dioxide three-washing process - Google Patents
Titanium dioxide three-washing process Download PDFInfo
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- CN114380328A CN114380328A CN202111623133.0A CN202111623133A CN114380328A CN 114380328 A CN114380328 A CN 114380328A CN 202111623133 A CN202111623133 A CN 202111623133A CN 114380328 A CN114380328 A CN 114380328A
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- C01G23/00—Compounds of titanium
- C01G23/04—Oxides; Hydroxides
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Abstract
The invention belongs to the technical field of titanium dioxide production, and particularly relates to a titanium dioxide three-washing process. The method comprises the steps of conveying the coating slurry in a coating slurry storage tank into a three-washing diaphragm filter press, conveying washing water from a three-washing water supply tank into the three-washing diaphragm filter press, conveying compressed air from a compressed air storage tank into the three-washing diaphragm filter press, treating the coating slurry by the three-washing diaphragm filter press to obtain a three-washing filter cake, taking washing water within 0-30min after the three-washing diaphragm filter press starts to work as front-stage washing water, taking washing water 30min till the three-washing step is finished as rear-stage washing water, and conveying the rear-stage washing water into a two-washing water supply tank to serve as second-washing water. The invention uses the back washing water of the third washing step in the second washing step, increases the utilization times of the water, namely recycling, thereby reducing the water intake of the fresh water to achieve the purpose of saving water.
Description
Technical Field
The invention belongs to the technical field of titanium dioxide production, and particularly relates to a titanium dioxide three-washing process.
Background
The production process of the titanium dioxide comprises the following steps of carrying out acidolysis on crushed and ground titanium ore under the action of concentrated sulfuric acid and water to generate titanium liquid, hydrolyzing the titanium liquid to generate hydrated titanium dioxide (namely metatitanic acid), then carrying out twice water washing, carrying out salt treatment on the metatitanic acid, calcining in a rotary kiln, finally carrying out surface treatment on the calcined crystal-form titanium dioxide, and carrying out third water washing after the surface treatment (including infiltration coating treatment). The hydrolyzed hydrated titanium dioxide contains sulfuric acid and ions such as iron, aluminum, manganese, copper, nickel, vanadium, lead and the like, and if the ions enter a rotary kiln along with the hydrated titanium dioxide, corresponding oxides are generated through calcination, and various colors are displayed, so that products are polluted to different degrees. Therefore, the purpose of the first two water washes is to remove sulfuric acid and iron, aluminum, manganese, copper, nickel, vanadium, lead, etc. ions contained in the hydrous titanium dioxide. As a large amount of inorganic salt is added into the coated material, the quality of a final product is affected by a part of incompletely reacted salt, and therefore, the coated material needs to be washed by water for the third time. In the production process of titanium dioxide, reducing water consumption means reducing cost, and two methods for reducing water consumption from the process perspective are available: firstly, the water consumption is reduced through process change and modification, the water intake of fresh water is reduced, and the water-saving effect is achieved; secondly, the utilization frequency of water is increased through process modification, namely, the water is recycled, so that the water taking quantity of fresh water is reduced to achieve the purpose of saving water, the water quality of the recycled water and the use points of the recycled water are also separated in the process of recycling the water, and if the recycled water is wrong, normal production is directly influenced, and the product is unqualified.
Disclosure of Invention
In order to save water in the production process of titanium dioxide, the invention provides a titanium dioxide three-washing process.
The technical scheme adopted by the invention is as follows:
a titanium dioxide three-washing process comprises the following steps:
step 1: introducing the coating slurry, washing water and compressed air into a three-washing diaphragm filter press for filter pressing to obtain a three-washing filter cake, filtrate, front-stage washing water and rear-stage washing water;
step 2: conveying the three-stage filter cake washing to a three-stage filter cake storage hopper for storage, conveying the filtrate and the front-stage washing water to a filtrate buffer tank for storage, and conveying the rear-stage washing water to a washing liquid buffer tank for storage;
and step 3: and (4) carrying out titanium recovery treatment on the filtrate and the front-stage washing water in the filtrate buffer tank, and conveying the rear-stage washing water in the washing liquid buffer tank to the secondary washing water supply tank to be used as secondary washing water.
After the technical scheme is adopted, the back-end water of the washing water generated in the third washing step is used as the washing water of the second washing step, so that the water consumption in the titanium dioxide production process is saved, the back-end water is selected as the washing water, cerium ammonium nitrate is not contained in the back-end water, and the concentration of sodium ions reaches the standard and does not influence the product quality.
Preferably, in step 1, the coating slurry in the coating slurry storage tank is introduced into a three-washing membrane filter press by a coating slurry pump, and the washing water in the three-washing water supply tank is introduced into the three-washing membrane filter press by a three-washing water supply pump.
After the technical scheme is adopted, the coating slurry is conveyed to a three-washing diaphragm filter press, and the washing water is conveyed to the three-washing diaphragm filter press.
Preferably, a three-way valve is arranged on a water outlet pipe of the three-washing membrane filter press in the step 2, two water outlets of the three-way valve are respectively connected with the washing liquid buffer tank and the filtrate buffer tank through pipelines, and the front-stage washing water is introduced into the filtrate buffer tank or the rear-stage washing water is introduced into the washing liquid buffer tank by switching the working position of the three-way valve.
After the technical scheme is adopted, the front-section washing water in the three-washing process is sent to the filtrate buffer tank and the rear-section washing water is sent to the washing liquid buffer tank by controlling the three-way valve.
Preferably, a water suction pump is arranged between the washing liquid buffer tank and the two washing water supply tanks in the step 3.
After the technical scheme is adopted, the three-washing-stage washing water in the washing liquid buffer tank is pumped into the two-washing water supply tank through the water suction pump to be used as two-washing water.
Preferably, the front-stage washing water is the washing water discharged within 0-30min after the three-washing diaphragm filter press starts to work, and the rear-stage washing water is the washing water discharged after 30min until the three-washing step is finished.
After the technical scheme is adopted, the time for recovering the washing water is too early, sodium ions which are not washed away and ammonium ceric nitrate which may not be completely coated are brought into materials, the quality of the washing water cannot reach the standard, so that the product is unqualified, the time for recovering the washing water is too late, and great water resource waste is caused.
Preferably, a thermostat is disposed in the second washing water tank in the step 3.
After the technical scheme is adopted, the heating device heats the back-end water, so that iron ions in the material can be conveniently removed.
Preferably, the temperature of the post-stage washing water is 50 to 60 ℃.
After the technical scheme is adopted, when the washing water temperature is too low, iron ions in the materials are difficult to be brought out by the washing water, so that the quality is unqualified, and when the washing water temperature is too high, the washing filter cloth can be damaged.
Preferably, the washing water in the three-washing water supply tank is gas powder spray water generated in a gas powder working section in the titanium dioxide production process, and the gas powder spray water which is not used up in the three-washing step is used as the secondary washing water in the secondary washing step.
After the technical scheme is adopted, the water consumption is further saved, and the waste is avoided.
In summary, due to the adoption of the technical scheme, the invention has the beneficial effects that:
1. the back washing water of the third washing step is used as the second washing water of the second washing step, and the utilization times of the water are increased, namely the water is recycled, so that the water intake of the fresh water is reduced to achieve the purpose of saving water.
2. The water is saved and the product quality is not influenced.
Drawings
The invention will now be described, by way of example, with reference to the accompanying drawings, in which:
FIG. 1 is a schematic process flow diagram of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present application without making any creative effort, shall fall within the protection scope of the present application.
In the description of the embodiments of the present application, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings or orientations or positional relationships that the products of the present invention are usually placed in when used, and are only used for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements that are referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present application. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.
The present invention will be described in detail with reference to fig. 1.
A titanium dioxide three-washing process comprises the following steps:
step 1: introducing the coating slurry, washing water and compressed air into a three-washing diaphragm filter press for filter pressing to obtain a three-washing filter cake, filtrate, front-stage washing water and rear-stage washing water;
step 2: conveying the three-stage filter cake washing to a three-stage filter cake storage hopper for storage, conveying the filtrate and the front-stage washing water to a filtrate buffer tank for storage, and conveying the rear-stage washing water to a washing liquid buffer tank for storage;
and step 3: and (4) carrying out titanium recovery treatment on the filtrate and the front-stage washing water in the filtrate buffer tank, and conveying the rear-stage washing water in the washing liquid buffer tank to the secondary washing water supply tank to be used as secondary washing water.
In this embodiment, the two washing water supply tanks are provided with the thermostat device, and the temperature of the washing water in the two washing water supply tanks is controlled to be 55 degrees, and the thermostat device is the prior art and is not an innovation of the present invention, so detailed description is not provided in this embodiment.
In this embodiment, the front-stage washing water is the washing water discharged within 0-30min after the three-washing diaphragm filter press starts to work, and the rear-stage washing water is the washing water discharged after 30min until the three-washing step is finished.
In this embodiment, a water pump is disposed between the washing liquid buffer tank and the two washing water tanks in step 3.
In this embodiment, the washing water in the three-washing water supply tank is gas powder spray water generated in a gas powder working section in the titanium dioxide production process, and the gas powder spray water that is not used up in the three-washing step is used as the second washing water in the second washing step.
In this embodiment, in step 1, the coating slurry in the coating slurry storage tank is introduced into the three-washing membrane filter press by the coating slurry pump, and the washing water in the three-washing water supply tank is introduced into the three-washing membrane filter press by the three-washing water supply pump.
In this embodiment, a three-way valve is disposed on the water outlet pipe of the three-washing membrane filter press in step 2, two water outlets of the three-way valve are respectively connected with the washing liquid buffer tank and the filtrate buffer tank through pipelines, and the front-stage washing water is introduced into the filtrate buffer tank or the rear-stage washing water is introduced into the washing liquid buffer tank by switching the working position of the three-way valve.
In this embodiment, the titanium dioxide three-washing process is an LR952 titanium dioxide three-washing process.
In this embodiment, the other processes of the titanium dioxide production process not related to the present invention are the prior art, and are not innovations of the present invention, so detailed descriptions are not provided in this embodiment.
The specific use flow of the invention is as follows:
step 1: conveying the coating slurry in the coating slurry storage tank to a three-washing diaphragm filter press through a coating slurry feed pump, conveying washing water to the three-washing diaphragm filter press through a three-washing water supply tank, and conveying compressed air to the three-washing diaphragm filter press through a compressed air storage tank;
step 2: the coating slurry is processed by a three-washing diaphragm filter press to obtain three-washing filter cakes, and the three-washing filter cakes are conveyed to a third washing filter pressThe concentration of sodium ions in the later stage washing water is detected by an atomic absorption method in the filter cake washing storage hopper, and the result shows that the concentration of the sodium ions in the later stage washing water is 100mg/m3If the ammonium cerium nitrate in the rear-section washing water is not detected, the front-section washing water in the three-section washing process is sent to a filtrate buffer tank by controlling a three-way valve, and the rear-section washing water is sent to a washing liquid buffer tank;
and step 3: and conveying the three filter cakes in the three filter cake storage hopper to the next procedure for treatment, waiting for the filtrate and the front-stage washing water in the filtrate buffer tank to go to the titanium removal recovery process for processing treatment, conveying the rear-stage washing water in the washing liquid buffer tank to a second washing water supply tank through a water suction pump to be used as second washing water, and controlling the temperature of the washing water to be 55 ℃ by a temperature control device in the second washing water supply tank to be used as the second washing water.
Compared with the existing titanium dioxide production process, the method uses the back washing water of the third washing step as the secondary washing water of the second washing step, increases the utilization times of water, namely recycling, and thus reduces the water intake of fresh water to achieve the purpose of water saving.
The above-mentioned embodiments only express the specific embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present application. It should be noted that, for those skilled in the art, without departing from the technical idea of the present application, several changes and modifications can be made, which are all within the protection scope of the present application.
Claims (8)
1. A titanium dioxide three-washing process is characterized in that: the method comprises the following steps:
step 1: introducing the coating slurry, washing water and compressed air into a three-washing diaphragm filter press for filter pressing to obtain a three-washing filter cake, filtrate, front-stage washing water and rear-stage washing water;
step 2: conveying the three-stage filter cake washing to a three-stage filter cake storage hopper for storage, conveying the filtrate and the front-stage washing water to a filtrate buffer tank for storage, and conveying the rear-stage washing water to a washing liquid buffer tank for storage;
and step 3: and (4) carrying out titanium recovery treatment on the filtrate and the front-stage washing water in the filtrate buffer tank, and conveying the rear-stage washing water in the washing liquid buffer tank to the secondary washing water supply tank to be used as secondary washing water.
2. The titanium dioxide three-washing process according to claim 1, characterized in that: in the step 1, the coating slurry in the coating slurry storage tank is introduced into a three-washing diaphragm filter press through a coating slurry pump, and the washing water in a three-washing water supply tank is introduced into the three-washing diaphragm filter press through a three-washing water supply pump.
3. The titanium dioxide three-washing process according to claim 1, characterized in that: and 2, a water outlet pipe is arranged at a water outlet of the three-washing membrane filter press, a three-way valve is arranged on the water outlet pipe, two water outlets of the three-way valve are respectively connected with the washing liquid buffer tank and the filtrate buffer tank through pipelines, and the front-section washing water is introduced into the filtrate buffer tank or the rear-section washing water is introduced into the washing liquid buffer tank by switching the working position of the three-way valve.
4. The titanium dioxide three-washing process according to claim 1, characterized in that: and in the step 3, a water suction pump is arranged between the washing liquid buffer tank and the second washing water supply tank.
5. The titanium dioxide three-washing process according to claim 1, characterized in that: the front-stage washing water is the washing water discharged within 0-30min after the three-washing diaphragm filter press starts to work, and the rear-stage washing water is the washing water discharged after 30min until the three-washing step is finished.
6. The titanium dioxide three-washing process according to claim 1, characterized in that: and a constant temperature device is arranged in the second washing water supply tank in the step 3.
7. The titanium dioxide three-washing process according to claim 1, characterized in that: the temperature of the back-stage washing water is 50-60 ℃.
8. The titanium dioxide three-washing process according to claim 1, characterized in that: the washing water in the three-washing water supply tank is gas powder spray water generated in a gas powder working section in the titanium dioxide production process, and the gas powder spray water which is not used up in the three-washing step is used as secondary washing water in the secondary washing step.
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| CN202111623133.0A CN114380328A (en) | 2021-12-28 | 2021-12-28 | Titanium dioxide three-washing process |
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| CN202111623133.0A CN114380328A (en) | 2021-12-28 | 2021-12-28 | Titanium dioxide three-washing process |
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| CN105271397A (en) * | 2015-10-29 | 2016-01-27 | 济南裕兴化工有限责任公司 | Production method of titanium dioxide capable of reducing water consumption |
| WO2016110268A1 (en) * | 2015-01-09 | 2016-07-14 | 上海安赐环保科技股份有限公司 | Green and environmentally friendly sulfuric acid process titanium dioxide powder production equipment and technique |
| CN107055600A (en) * | 2016-08-31 | 2017-08-18 | 襄阳龙蟒钛业有限公司 | Two washing lotion recoverying and utilizing method in a kind of method for producing gtitanium dioxide with sulphuric acid |
| CN110759380A (en) * | 2019-10-31 | 2020-02-07 | 襄阳龙蟒钛业有限公司 | Low-temperature low-acidity metatitanic acid bleaching process |
| WO2020082916A1 (en) * | 2018-10-25 | 2020-04-30 | 上海安赐环保科技股份有限公司 | Novel sulfuric acid process titanium oxide water washing process and system |
-
2021
- 2021-12-28 CN CN202111623133.0A patent/CN114380328A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2016110268A1 (en) * | 2015-01-09 | 2016-07-14 | 上海安赐环保科技股份有限公司 | Green and environmentally friendly sulfuric acid process titanium dioxide powder production equipment and technique |
| CN105271397A (en) * | 2015-10-29 | 2016-01-27 | 济南裕兴化工有限责任公司 | Production method of titanium dioxide capable of reducing water consumption |
| CN107055600A (en) * | 2016-08-31 | 2017-08-18 | 襄阳龙蟒钛业有限公司 | Two washing lotion recoverying and utilizing method in a kind of method for producing gtitanium dioxide with sulphuric acid |
| WO2020082916A1 (en) * | 2018-10-25 | 2020-04-30 | 上海安赐环保科技股份有限公司 | Novel sulfuric acid process titanium oxide water washing process and system |
| CN110759380A (en) * | 2019-10-31 | 2020-02-07 | 襄阳龙蟒钛业有限公司 | Low-temperature low-acidity metatitanic acid bleaching process |
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