CN110817948A - Continuous washing device and method for titanium dioxide - Google Patents
Continuous washing device and method for titanium dioxide Download PDFInfo
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- CN110817948A CN110817948A CN201911091974.4A CN201911091974A CN110817948A CN 110817948 A CN110817948 A CN 110817948A CN 201911091974 A CN201911091974 A CN 201911091974A CN 110817948 A CN110817948 A CN 110817948A
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- C01G23/00—Compounds of titanium
- C01G23/04—Oxides; Hydroxides
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- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
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Abstract
The invention discloses a titanium dioxide continuous washing device and a method, wherein a belt filter is sequentially provided with a waste acid separation zone, a primary washing zone, a rinsing zone and a secondary washing zone; the inlet end of the first gas-liquid separator is communicated with the waste acid separation zone, the inlet end of the second gas-liquid separator is communicated with the primary washing zone, the inlet end of the third gas-liquid separator is communicated with the rinsing zone, the outlet end of the third gas-liquid separator is communicated with the primary washing zone, the inlet end of the fourth gas-liquid separator is communicated with the secondary washing zone, and the outlet end of the fourth gas-liquid separator is communicated with the rinsing zone. The invention can change the traditional water system process of titanium dioxide into continuous washing, thereby effectively improving the production efficiency; the washing water separated after washing is recycled, and the washing water is recycled for washing for multiple times, so that the addition of the washing water is reduced, the amount of wastewater is reduced, the production cost is saved, and the development requirement of environmental protection is met.
Description
Technical Field
The invention relates to the technical field of titanium dioxide production, in particular to a continuous titanium dioxide washing device and method.
Background
The titanium dioxide production needs washing and impurity removal work through a sulfuric acid method, manufacturers in the current industry generally adopt a leaf filter or a filter press for washing and impurity removal, the production process is intermittent production, multiple process steps in the production link are complex, continuous production cannot be carried out, the production efficiency is low, the quantity of required equipment and storage tanks is large, and the production cost is high.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provides a titanium dioxide continuous washing device with high production efficiency.
In order to solve the technical problems, the invention adopts the technical scheme that: the titanium dioxide continuous washing device comprises a belt filter, wherein a waste acid separation zone, a primary washing zone, a rinsing zone and a secondary washing zone are sequentially arranged on the belt filter; still include first vapour and liquid separator, second vapour and liquid separator, third vapour and liquid separator and fourth vapour and liquid separator that communicate each other, first vapour and liquid separator's entry end and waste acid separation zone intercommunication, second vapour and liquid separator's entry end and washing district intercommunication once, third vapour and liquid separator's entry end and rinsing district intercommunication, third vapour and liquid separator's exit end and washing district intercommunication once, fourth vapour and liquid separator's entry end and secondary washing district intercommunication, fourth vapour and liquid separator's exit end and rinsing district intercommunication.
Further, the method comprises the following steps: the vacuum generator is communicated with the first gas-liquid separator, the second gas-liquid separator, the third gas-liquid separator and the fourth gas-liquid separator.
Further, the method comprises the following steps: also comprises a cloth washing device arranged at the discharge end of the belt filter.
The invention also provides a titanium dioxide continuous washing method by adopting the titanium dioxide continuous washing device.
Further, the method comprises the following steps: the continuous washing method of the titanium dioxide comprises the following steps:
feeding hydrolyzed metatitanic acid to a belt filter, separating metatitanic acid and waste acid in a waste acid separation zone in a negative pressure environment, and discharging the waste acid after separation by a first gas-liquid separator;
step two, metatitanic acid enters a primary washing area, rinse water separated by a third gas-liquid separator is subjected to primary washing, and washing water discharged by the primary washing is separated by a second gas-liquid separator and then recovered;
step three, allowing the metatitanic acid subjected to primary washing to enter a rinsing area, adding washing water separated by a fourth gas-liquid separator into a rinsing processor for rinsing, and discharging rinsing water discharged by rinsing into a primary washing area after separation by a third gas-liquid separator;
step four, the metatitanic acid after rinsing enters a secondary washing area, washing water recovered by a second gas-liquid separator is subjected to secondary washing, and washing water discharged by the secondary washing is separated by a fourth gas-liquid separator and then discharged into the rinsing area;
and fifthly, discharging the metatitanic acid subjected to secondary washing, then entering a subsequent process, and cleaning the filter cloth by a cloth washing device and then repeating the next production.
Further, the method comprises the following steps: the solid content of metatitanic acid separated in the first step is 30-40%, and the iron content is more than 10000 ppm.
Further, the method comprises the following steps: the iron content in the metatitanic acid subjected to the primary washing in the second step is less than 2000 ppm.
Further, the method comprises the following steps: the content of the rinsing treatment agent in the rinsed metatitanic acid in the third step is 0.2-0.8%.
Further, the method comprises the following steps: in the fourth step, the iron content in the metatitanic acid after the secondary washing is less than 20 ppm.
The invention has the beneficial effects that: the invention can change the traditional water system process of titanium dioxide into continuous washing, thereby effectively improving the production efficiency; the washing water separated after washing is recycled, and the washing water is recycled for washing for multiple times, so that the addition of the washing water is reduced, the amount of wastewater is reduced, the production cost is saved, and the development requirement of environmental protection is met.
Drawings
FIG. 1 is a schematic diagram of a continuous titanium dioxide washing device according to the present invention;
labeled as: 100-belt filter, 110-waste acid separation zone, 120-primary washing zone, 130-rinsing zone, 140-secondary washing zone, 210-first gas-liquid separator, 220-second gas-liquid separator, 230-third gas-liquid separator, 240-fourth gas-liquid separator, 300-vacuum generator and 400-cloth washing device.
Detailed Description
In order to facilitate understanding of the invention, the invention is further described below with reference to the accompanying drawings.
As shown in fig. 1, the titanium dioxide washing device of the present invention is continuously provided with four partitions on the belt filter 100, including a waste acid separation area 110, a primary washing area 120, a rinsing area 130 and a secondary washing area 140, and with the operation of the belt filter 100, the filter cloth passes through the cavities of the waste acid separation area 110, the primary washing area 120, the rinsing area 130 and the secondary washing area 140 in sequence, and the waste acid separation, the primary washing, the rinsing and the secondary washing processes are sequentially performed on the metatitanic acid hydrolyzed in the titanium dioxide production in the cavities of the partitions.
In the present invention, the first gas-liquid separator 210, the second gas-liquid separator 220, the third gas-liquid separator 230 and the fourth gas-liquid separator 240 are used to separate and recover the waste acid and the washing water. The inlet end of the first gas-liquid separator 210 is communicated with the waste acid separation zone 110, the inlet end of the second gas-liquid separator 220 is communicated with the primary washing zone 120, the inlet end of the third gas-liquid separator 230 is communicated with the rinsing zone 130, the outlet end of the third gas-liquid separator 230 is communicated with the primary washing zone 120, the inlet end of the fourth gas-liquid separator 240 is communicated with the secondary washing zone 140, and the outlet end of the fourth gas-liquid separator 240 is communicated with the rinsing zone 130.
The first gas-liquid separator 210, the second gas-liquid separator 220, the third gas-liquid separator 230 and the fourth gas-liquid separator 240 are communicated with each other, so that the separated gas is collected in a centralized manner, and the vacuum generator 300 is arranged in the invention to provide a negative pressure vacuum environment for the washing impurity removal process of the hydrolyzed metatitanic acid. The vacuum generator 300 is in communication with the first gas-liquid separator 210, the second gas-liquid separator 220, the third gas-liquid separator 230, and the fourth gas-liquid separator 240, and indirectly in communication with the spent acid separation zone 110, the primary washing zone 120, the rinsing zone 130, and the secondary washing zone 140.
The hydrolysis metatitanic acid sequentially passes through the waste acid separation zone 110, the primary washing zone 120, the rinsing zone 130 and the secondary washing zone 140 along with the operation of the belt filter 100, and then the hydrolysis impurity removal can be completed, and then the hydrolysis impurity removal is carried out in a process that needs to be carried out, and the filter cloth needs to be reset after being cleaned and then the hydrolysis impurity removal is carried out repeatedly, so that the cloth cleaning device 400 is arranged at the discharge end of the belt filter 100, the filter cloth is cleaned through the cloth cleaning device 400, and the cloth cleaning liquid is recovered.
The invention also discloses a titanium dioxide continuous washing process by adopting the titanium dioxide continuous washing device, which specifically comprises the following steps:
feeding hydrolyzed metatitanic acid to a belt filter, separating the hydrolyzed metatitanic acid into metatitanic acid and waste acid in a waste acid separation zone in a negative pressure environment, separating the waste acid by a first gas-liquid separator, and discharging the waste acid, wherein metatitanic acid filter cakes and waste acid liquid with the solid content of 30-40% and the iron content of more than 10000ppm are obtained through separation in the step;
step two, allowing metatitanic acid to enter a primary washing area, washing the rinsing water separated by a third gas-liquid separator for the first time, separating and recycling the washing water discharged by the primary washing through a second gas-liquid separator, and enabling the iron content in metatitanic acid to be less than 2000ppm after the primary washing;
step three, allowing the metatitanic acid subjected to primary washing to enter a rinsing area, adding washing water separated by a fourth gas-liquid separator into a rinsing processor, and then rinsing, separating rinsing water discharged by rinsing through a third gas-liquid separator and discharging into the primary washing area, wherein the content of a rinsing treatment agent in the metatitanic acid subjected to rinsing is 0.2-0.8%;
step four, the metatitanic acid after rinsing enters a secondary washing area, washing water recovered by a second gas-liquid separator is subjected to secondary washing, the time of the secondary washing is 6 times that of the primary washing, washing water discharged by the secondary washing is separated by a fourth gas-liquid separator and then discharged into the rinsing area, and the iron content of the metatitanic acid after the secondary washing is less than 20 ppm;
and fifthly, discharging the metatitanic acid subjected to secondary washing, then entering a subsequent process, cleaning the filter cloth by a cloth washing device, and then repeating the next production, wherein the cloth washing device recovers the cloth washing liquid for recycling.
Claims (9)
1. Titanium white powder continuous washing device, its characterized in that: the device comprises a belt filter (100), wherein a waste acid separation zone (110), a primary washing zone (120), a rinsing zone (130) and a secondary washing zone (140) are sequentially arranged on the belt filter (100); the waste acid washing machine is characterized by further comprising a first gas-liquid separator (210), a second gas-liquid separator (220), a third gas-liquid separator (230) and a fourth gas-liquid separator (240) which are communicated with each other, wherein the inlet end of the first gas-liquid separator (210) is communicated with the waste acid separation zone (110), the inlet end of the second gas-liquid separator (220) is communicated with the primary washing zone (120), the inlet end of the third gas-liquid separator (230) is communicated with the rinsing zone (130), the outlet end of the third gas-liquid separator (230) is communicated with the primary washing zone (120), the inlet end of the fourth gas-liquid separator (240) is communicated with the secondary washing zone (140), and the outlet end of the fourth gas-liquid separator (240) is communicated with the rinsing zone.
2. A titanium dioxide continuous washing device according to claim 1, characterized in that: the device also comprises a vacuum generator (300), wherein the vacuum generator (300) is communicated with the first gas-liquid separator (210), the second gas-liquid separator (220), the third gas-liquid separator (230) and the fourth gas-liquid separator (240).
3. A titanium dioxide continuous washing device according to claim 1 or 2, characterized in that: also comprises a cloth washing device (400) arranged at the discharge end of the belt filter (100).
4. The continuous washing process of titanium dioxide is characterized by comprising the following steps: the continuous washing device for titanium dioxide according to claim 3.
5. A continuous washing method for titanium dioxide according to claim 4, characterized in that: the method comprises the following steps:
feeding hydrolyzed metatitanic acid to a belt filter, separating metatitanic acid and waste acid in a waste acid separation zone in a negative pressure environment, and discharging the waste acid after separation by a first gas-liquid separator;
step two, metatitanic acid enters a primary washing area, rinse water separated by a third gas-liquid separator is subjected to primary washing, and washing water discharged by the primary washing is separated by a second gas-liquid separator and then recovered;
step three, allowing the metatitanic acid subjected to primary washing to enter a rinsing area, adding washing water separated by a fourth gas-liquid separator into a rinsing processor for rinsing, and discharging rinsing water discharged by rinsing into a primary washing area after separation by a third gas-liquid separator;
step four, the metatitanic acid after rinsing enters a secondary washing area, washing water recovered by a second gas-liquid separator is subjected to secondary washing, and washing water discharged by the secondary washing is separated by a fourth gas-liquid separator and then discharged into the rinsing area;
and fifthly, discharging the metatitanic acid subjected to secondary washing, then entering a subsequent process, and cleaning the filter cloth by a cloth washing device and then repeating the next production.
6. A continuous washing method for titanium dioxide according to claim 5, characterized in that: the solid content of metatitanic acid separated in the first step is 30-40%, and the iron content is more than 10000 ppm.
7. A continuous washing method for titanium dioxide according to claim 5, characterized in that: the iron content in the metatitanic acid subjected to the primary washing in the second step is less than 2000 ppm.
8. A continuous washing method for titanium dioxide according to claim 5, characterized in that: the content of the rinsing treatment agent in the rinsed metatitanic acid in the third step is 0.2-0.8%.
9. A continuous washing method for titanium dioxide according to claim 5, characterized in that: in the fourth step, the iron content in the metatitanic acid after the secondary washing is less than 20 ppm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911091974.4A CN110817948A (en) | 2019-11-08 | 2019-11-08 | Continuous washing device and method for titanium dioxide |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911091974.4A CN110817948A (en) | 2019-11-08 | 2019-11-08 | Continuous washing device and method for titanium dioxide |
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| CN110817948A true CN110817948A (en) | 2020-02-21 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1539745A (en) * | 2003-10-28 | 2004-10-27 | 南宁一泓环境工程有限公司 | Filterpressing, washing, cleansing processes for manufacturing hydration titania |
| US20080159933A1 (en) * | 2006-12-28 | 2008-07-03 | E. I. Dupont De Nemours And Company | Processes for producing titanium dioxide |
| CN103638734A (en) * | 2013-12-30 | 2014-03-19 | 攀枝花东方钛业有限公司 | Rotating-platform vacuum filtering machine and filtering method |
| CN106118140A (en) * | 2016-06-13 | 2016-11-16 | 四川龙蟒钛业股份有限公司 | A kind of preparation method of high whiteness high-temperature resistant color masterbatch level titanium dioxide |
| CN209204790U (en) * | 2018-11-12 | 2019-08-06 | 湖北三宁化工股份有限公司 | The wash mill of acid solid object |
-
2019
- 2019-11-08 CN CN201911091974.4A patent/CN110817948A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1539745A (en) * | 2003-10-28 | 2004-10-27 | 南宁一泓环境工程有限公司 | Filterpressing, washing, cleansing processes for manufacturing hydration titania |
| US20080159933A1 (en) * | 2006-12-28 | 2008-07-03 | E. I. Dupont De Nemours And Company | Processes for producing titanium dioxide |
| CN103638734A (en) * | 2013-12-30 | 2014-03-19 | 攀枝花东方钛业有限公司 | Rotating-platform vacuum filtering machine and filtering method |
| CN106118140A (en) * | 2016-06-13 | 2016-11-16 | 四川龙蟒钛业股份有限公司 | A kind of preparation method of high whiteness high-temperature resistant color masterbatch level titanium dioxide |
| CN209204790U (en) * | 2018-11-12 | 2019-08-06 | 湖北三宁化工股份有限公司 | The wash mill of acid solid object |
Non-Patent Citations (1)
| Title |
|---|
| 佐伯康治: "《化工生产闭路系统》", 30 June 1987, 北京：化学工业出版社 * |
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Application publication date: 20200221 |