CN107324385A - One kind reduces washing method in production process of titanium pigment - Google Patents
One kind reduces washing method in production process of titanium pigment Download PDFInfo
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- CN107324385A CN107324385A CN201710655443.8A CN201710655443A CN107324385A CN 107324385 A CN107324385 A CN 107324385A CN 201710655443 A CN201710655443 A CN 201710655443A CN 107324385 A CN107324385 A CN 107324385A
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01G—COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSES C01D OR C01F
- C01G23/00—Compounds of titanium
- C01G23/04—Oxides; Hydroxides
- C01G23/047—Titanium dioxide
- C01G23/053—Producing by wet processes, e.g. hydrolysing titanium salts
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Abstract
Sichuan dragon boa inventor：Washing method in production process of titanium pigment is reduced the present invention relates to one kind, including metatitanic acid two washes step, described two, which wash step, includes leading portion washing and back segment washing, is washed when back segment is washed relative to leading portion washing using low discharge desalted water.This method is washed in step in metatitanic acid two, by using control by stages desalination water-carrying capacity, wash water consumption both can be effectively reduced, while can ensure de-ferrous effect.
Description
Technical field
Washing method in production process of titanium pigment is reduced the present invention relates to one kind, belongs to titanium white production technical field.
Background technology
Current China titanium white production is main based on sulfuric acid process, and titanium liquid obtains white metatitanic acid precipitation after hydrolysis, its
In containing the impurity such as substantial amounts of ferrous sulfate.Impurity iron have an impact in the presence of meeting to the brightness of titanium dioxide product, whiteness.General profit in industry
Aqueous nature is dissolved in ferrous sulfate, carries out washing to metatitanic acid with filter press and reach to remove iron purpose.Metatitanic acid is except three steps of iron point
Suddenly：One washes, bleaches, two wash.
Acidity is gradually reduced during metatitanic acid one is washed, and ferric ion can be hydrolyzed in pH ＞ 2.5 and is settled out insoluble
In the iron hydroxide of water, it is impossible to remove, now Fe in metatitanic acid2+/TiO2About 1000ppm or so.By adding in bleaching process
Sulfuric acid with reducing agent by ferric iron back into ferrous iron, then carry out two and wash.Two wash water small parts are reclaimed washes for one, most of
Discharged after processing.Two wash need to be by Fe in metatitanic acid2+/TiO2Control, just will not be blue to later product brightness within 20ppm
Light whiteness has an impact.
Two scouring water amounts are maximum in whole titanium white production, in traditional handicraft, and two wash Cheng Jun using firm discharge
Desalted water is washed.And in order to improve de-ferrous effect, be all the means simply using increase wash water consumption, cause desalted water
Consumption is huge, and often producing 1 ton of titanium dioxide two and washing needs with 55 DEG C to 60 DEG C 30 tons of desalted waters.And heat this partially desalted water needs
Use a large amount of steam energies.Furthermore it is typically all, with exchanger resin method production desalted water, often to produce one ton of desalted water meeting both at home and abroad
Produce about 0.5kg sodium chloride.Therefore not only a large amount of consumption water resources in production process of titanium pigment, the energy, due to preparing desalted water
The sodium chloride of generation can also have been destroyed to environment, be that this enterprise pays huge production cost.
During domestic and international titanium white production producer washing metatitanic acid, do not possessed some special knowledge on mode of washing.It is from water mostly
Processing cycle considers reduction titanium dioxide water consumption using aspect research, reduces pollutant emission, reduces enterprise's production cost.Patent
CN201510716977.8 washes Sewage treatment by three is used for two washings.Due to unnecessary when three, which wash, mainly washs titanium dioxide coating
Salinity, so three wash in waste water contain substantial amounts of metal salinity.Metatitanic acid two needs to be quantitatively adding fixed salinity after washing end
Particle morphology during adjustment calcining.If salinity species, quantity excessively can influence on product quality.Patent
CN201310083671.4 is washed two and is washed generation total acidic waste water through carbide slag with one, and the material such as calcium oxide, calcium hydroxide is neutralized
The filtrate obtained after processing is reclaimed for two washings.The method can produce substantial amounts of solid waste-calcium sulfate, pollute environment.
Treatment of acidic wastewater can also increase enterprise's production cost.
The content of the invention
Washing method in production process of titanium pigment is reduced it is an object of the invention to provide one kind, concrete scheme is：
One kind reduces washing method in production process of titanium pigment, including metatitanic acid two washes step, and described two wash before step includes
Duan Shuixi and back segment washing, are washed when back segment is washed relative to leading portion washing using low discharge desalted water.
Further, the 1/3 of desalination water-carrying capacity when desalination water-carrying capacity is not higher than leading portion washing during the back segment washing.
Further, the water consumption of desalination per hour during the leading portion washing and TiO in washed metatitanic acid2Mass ratio
For 5~7：1；The time of the leading portion washing is 30~50min.
Further, the water consumption of desalination per hour during the leading portion washing and TiO in washed metatitanic acid2Mass ratio
For 6：1；The time of the leading portion washing is 40min.
Further, the time of the back segment washing is not less than 120min.
Further, described two Fe in the metatitanic acid before step is washed2+/TiO2≤1500ppm。
Further, described two wash desalination water pressure in step and be not less than 0.35mpa.
Inventor is through the discovery that studies for a long period of time, and metatitanic acid is during two wash, and iron content is reduced with the time in last stage wash water
Clearly, especially in preceding 40min, iron content is reduced to 50ppm or so by 1000ppm or so in wash water.Through analysis, about
The two of 200min wash wash time, and preceding 40min or so removes substantial amounts of Fe in iron, metatitanic acid filter cake for displacement2+Ion is desalted water
Take away.After 40min, tiny seam between filter cake is passed through because desalted water forms iron ion in fixed passage, filter cake in filter cake
Gap is diffused into inside desalted water, except iron is slower.It can not be improved except iron speed using the desalination water washing of big flow, on the contrary
The rise of pH value can be accelerated, make Fe2+The precipitation of ion formation iron hydroxide, is unfavorable for removing iron, while having wasted a large amount of de-
Salt solution.
In summary, beneficial point of the invention is, is washed in metatitanic acid two in step, by using control by stages desalination
Water-carrying capacity, desalination water-carrying capacity is reduced when back segment is washed, wash water consumption both can be effectively reduced, while can ensure except iron effect
Really.Ton titanium dioxide two is washed water consumption from 30 times from " source " and is reduced to 6 to 8 times by this method.This method is efficiently simple, not only
Do not interfere with two and wash de-ferrous effect, and energy saving water resource and steam, moreover it is possible to reduce enterprise's sewage discharge, have great to enterprise
Environmental protection and economy benefit.
Embodiment
Embodiment 1
Fe in metatitanic acid before two washings2+/TiO2=1030ppm.Two wash filter press charging 3t（With TiO2Meter）, charging terminate with
Afterwards, start two to wash.Preceding 30min washes supply-water pump electrically operated valve by two and adjusts wash water flow 21m3/h；Wash to adjust after 30min and supply
The m of water pump valve aperture adjustment wash water flow 63/ h, the duration is 120min.Whole washing process passes through outlet conduit control
Wash water pressure is 0.36mpa.
Embodiment 2
Fe in metatitanic acid before two washings2+/TiO2=800ppm.Two wash filter press charging 3t（With TiO2Meter）, charging terminate with
Afterwards, start two to wash.Preceding 50min washes supply-water pump electrically operated valve by two and adjusts wash water flow 15m3/h；Wash to adjust after 50min and supply
Water pump valve aperture adjustment wash water flow 5m3/ h, the duration is 120min.Whole washing process is washed by outlet conduit control
Water pressure is 0.35mpa.
Embodiment 3
Fe in metatitanic acid before two washings2+/TiO2=700ppm.Two wash filter press charging 3t（With TiO2Meter）, charging terminate with
Afterwards, start two to wash.Preceding 40min washes supply-water pump electrically operated valve by two and adjusts wash water flow 18m3/h；Wash to adjust after 40min and supply
The m of water pump valve aperture adjustment wash water flow 63/ h, the duration is 120min.Whole washing process passes through outlet conduit control
Wash water pressure is 0.4mpa.
Embodiment 4
Fe in metatitanic acid before two washings2+/TiO2=1500ppm.Two wash filter press charging 3t（With TiO2Meter）, charging terminate with
Afterwards, start two to wash.Preceding 40min washes supply-water pump electrically operated valve by two and adjusts wash water flow 18m3/h；Wash to adjust after 40min and supply
The m of water pump valve aperture adjustment wash water flow 43/ h, the duration is 140min.Whole washing process passes through outlet conduit control
Wash water pressure is 0.35mpa.
Embodiment 5
Fe in metatitanic acid before two washings2+/TiO2=1030ppm.Two wash filter press charging 3t（With TiO2Meter）, charging terminate with
Afterwards, start two to wash.Preceding 40min washes supply-water pump electrically operated valve by two and adjusts wash water flow 18m3/h；Wash to adjust after 40min and supply
Water pump valve aperture adjustment wash water flow 3m3/ h, the duration is 160min.Whole washing process is washed by outlet conduit control
Water pressure is 0.37mpa.
Comparative example 1
Fe in metatitanic acid before two washings2+/TiO2=1030ppm.Two wash filter press charging 3t（With TiO2Meter）, charging terminate with
Afterwards, start two to wash.Supply-water pump electrically operated valve, which is washed, by two adjusts wash water flow 21m3/ h, the duration is 200min.Entirely wash
Wash process controls wash water pressure to be 0.37mpa by outlet conduit.
Embodiment 1~5 and traditional handicraft contrast situation as shown in table 1, as can be seen from Table 1, can be by using this method
Ton TiO2Water consumption be reduced to 6 to 8 times, and product quality has reached brightness >=94.2 of the index of titanium dioxide product, whiteness
≥93。
Table 1：The product quality of embodiment 1~5 and normal product quality versus
Claims (7)
1. one kind reduces washing method in production process of titanium pigment, including metatitanic acid two washes step, it is characterised in that：Described two
Washing step includes leading portion washing and back segment washing, and water-filling is entered using low discharge desalted water relative to leading portion washing when back segment is washed
Wash.
2. washing method in reduction production process of titanium pigment according to claim 1, it is characterised in that：The back segment washing
When desalination water-carrying capacity be not higher than leading portion washing when desalination water-carrying capacity 1/3.
3. washing method in reduction production process of titanium pigment according to claim 1, it is characterised in that：The leading portion washing
When the water consumption of desalination per hour and washed metatitanic acid in TiO2Mass ratio be 5~7：1；The time of leading portion washing is
30~50min.
4. washing method in reduction production process of titanium pigment according to claim 1, it is characterised in that：The leading portion washing
When the water consumption of desalination per hour and washed metatitanic acid in TiO2Mass ratio be 6：1；The time of leading portion washing is
40min。
5. washing method in reduction production process of titanium pigment according to claim 1, it is characterised in that：The back segment washing
Time be not less than 120min.
6. washing method in reduction production process of titanium pigment according to claim 1, it is characterised in that：Described two wash step
Fe in preceding metatitanic acid2+/TiO2≤1500ppm。
7. washing method in reduction production process of titanium pigment according to claim 1, it is characterised in that：Described two wash step
Middle desalination water pressure is not less than 0.35mpa.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102627321A (en) * | 2012-04-01 | 2012-08-08 | 沙立林 | Method for preparing titanium pigment by using titanium residues obtained by directly reducing titanium-iron oxide |
| EP2474633A4 (en) * | 2009-09-02 | 2013-05-01 | Sha Lilin | Titaniumrich hydrochloric acid leaching residue use thereof and preparation method of titanium dioxide |
| CN103274462A (en) * | 2013-03-15 | 2013-09-04 | 四川龙蟒钛业股份有限公司 | Method for recycling acidic washing water in rutile titanium dioxide production process |
| CN104649317A (en) * | 2015-01-13 | 2015-05-27 | 漯河兴茂钛业股份有限公司 | Special nano titanium dioxide for flue gas denitration catalysts and preparation method thereof |
| CN105152407A (en) * | 2015-09-22 | 2015-12-16 | 湘潭大学 | Titanium dioxide production wastewater recycling method |
| CN106365197A (en) * | 2016-08-31 | 2017-02-01 | 四川龙蟒钛业股份有限公司 | Recycling method of titanium dioxide waste acid |
-
2017
- 2017-08-03 CN CN201710655443.8A patent/CN107324385A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2474633A4 (en) * | 2009-09-02 | 2013-05-01 | Sha Lilin | Titaniumrich hydrochloric acid leaching residue use thereof and preparation method of titanium dioxide |
| CN102627321A (en) * | 2012-04-01 | 2012-08-08 | 沙立林 | Method for preparing titanium pigment by using titanium residues obtained by directly reducing titanium-iron oxide |
| CN103274462A (en) * | 2013-03-15 | 2013-09-04 | 四川龙蟒钛业股份有限公司 | Method for recycling acidic washing water in rutile titanium dioxide production process |
| CN104649317A (en) * | 2015-01-13 | 2015-05-27 | 漯河兴茂钛业股份有限公司 | Special nano titanium dioxide for flue gas denitration catalysts and preparation method thereof |
| CN105152407A (en) * | 2015-09-22 | 2015-12-16 | 湘潭大学 | Titanium dioxide production wastewater recycling method |
| CN106365197A (en) * | 2016-08-31 | 2017-02-01 | 四川龙蟒钛业股份有限公司 | Recycling method of titanium dioxide waste acid |
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