CN101913719B - Recovery system and recovery method of materials in titanium white wastewater - Google Patents

Recovery system and recovery method of materials in titanium white wastewater Download PDF

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Publication number
CN101913719B
CN101913719B CN2010102554282A CN201010255428A CN101913719B CN 101913719 B CN101913719 B CN 101913719B CN 2010102554282 A CN2010102554282 A CN 2010102554282A CN 201010255428 A CN201010255428 A CN 201010255428A CN 101913719 B CN101913719 B CN 101913719B
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valve
wastewater
outlet
straining installation
front filter
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CN101913719A (en
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殷红忠
游翠纯
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ANHUI JINXING TITANIUM DIOXIDE (GROUP) Co Ltd
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ANHUI JINXING TITANIUM DIOXIDE (GROUP) Co Ltd
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Abstract

The invention relates to a recovery system and a recovery method of materials in titanium white wastewater, used for recovering the materials in the titanium white wastewater with low production cost. The recovery system of the materials in the titanium white wastewater comprises a prefilter barrel, a wastewater collection barrel, filter equipment and a wastewater outlet, wherein the outlets of the prefilter barrel and the wastewater collection barrel are respectively connected to the inlet of the filter equipment through a first valve and a second valve, the inlet of the prefilter barrel and the wastewater outlet are respectively connected with the outlet of the filter equipment through a third valve and a fourth valve, and a circulating pump is respectively arranged between the prefilter barrel and the first valve and between the wastewater collection barrel and the second valve. The recovery method of the materials in the titanium white wastewater comprises the following steps of firstly, enabling the prefilter barrel and the filter equipment to form a closed circulating loop, and forming a filter aid layer on a filter medium surface in the filter equipment by the materials in material raw solution in the prefilter barrel; secondly, enabling wastewater in the wastewater collection barrel to pass through the filter equipment, and discharging filtrate from the wastewater outlet. The invention has low production cost without needing to introduce flcculant.

Description

The recovery system of material and recovery method in the titanium dioxide wastewater
Technical field
The present invention relates to the recovery system and the recovery method of material in a kind of titanium dioxide wastewater.
Background technology
The production technique of present domestic white titanium pigment remains sulfuric acid process and takes as the leading factor, for obtaining superior in quality product, must adopt the method for washing to remove the soluble impurity element in the metatitanic acid in the production process.The equipment of washing has Moor's filter, plate-and-frame filter press and tubular filter etc. usually.Take which kind of washing plant all can have the problem of a recovery, this recovery is meant that material before forming filter cake on the filtration medium of straining installation, all can pass filtration medium along with mother liquor is drained in the waste water system by some material.In addition, when normal washing, receive condition effect such as production technique and equipment, also have partial material and be drained in the waste water system through filtration medium.Be discharged into the material of waste water system for these, manufacturer all reclaims with certain methods usually, and the purpose of doing like this can improve the yield of production on the one hand, also can alleviate the pressure of environmental protection in addition on the one hand.
What traditional recovery technology adopted basically is the mode with gravity settling, cooperates some common coagulation or polymeric flocculants, and the realization material separates with waste water.And in some occasion, the use of flocculation agent has brought a lot of troubles.Specifically, when the metatitanic acid washing step, flocculation agent gets in the normal production system in the time of can being reclaimed by material usually, because flocculation agent is the netted compound of a kind of polymer, very easily causes the obstruction of filtration medium, thereby influences production efficiency.In addition; This polymer characteristics of flocculation agent also can have influence on the use in the postprocessing working procedures removal process; This be because this product of white titanium pigment in application process to dispersed index require high; Even have the remaining of a spot of macromolecular compound all very likely to make dispersed index occur significantly descending, therefore have many difficulties at this through the method for adding polymeric flocculant.And if adopt the method for some inorganic flocculating agents also can have a lot of similar problems, production cost also compares higher.
Traditional recovery technology is the gravity settling method, and this method also has the distinct disadvantage of the big and recovering effect difference of floor space except above-mentioned various drawbacks.No matter select brick concrete structure or steelwork for use, this retrieving arrangement all needs very big floor space, and still contains more material in the waste water of discharging.
Summary of the invention
The present invention provides the recovery system of material in a kind of titanium dioxide wastewater, is used for the recovery of titanium dioxide wastewater material, and production cost is low.
The present invention also provides the recovery method of material in the titanium dioxide wastewater that adopts above-mentioned recovery system.
The recovery system of material in the said titanium dioxide wastewater; Comprise front filter barrel, wastewater collection bucket, straining installation, wastewater outlet; The outlet of front filter barrel and wastewater collection bucket is connected to the inlet of straining installation respectively through first valve, second valve; The inlet of front filter barrel and wastewater outlet are connected to the outlet of straining installation respectively through the 3rd valve and the 4th valve, between the front filter barrel and first valve, be equipped with recycle pump between wastewater collection bucket and second valve.As preferred version, the outlet of straining installation is higher than the inlet of front filter barrel.
The recovery method of material in the said titanium dioxide wastewater may further comprise the steps:
(1) is that the material stoste of 10-30% places front filter barrel with concentration, opens first and third valve, close second, four valves; Make front filter barrel and straining installation form the circulation loop of sealing; Material stoste is circulated in said circulation loop, and the concentration of material reaches emission request in the filtrating that the straining installation outlet is discharged, and the filtration medium that material is filtered in the equipment is trapped in the surface; Formation helps filtering layer, and filtrating is back to front filter barrel through the outlet of filtration equipment.When adopting preferred version; The outlet of straining installation is higher than the inlet of front filter barrel; Filtrating can directly be returned front filter barrel because of gravity like this, otherwise, form the circulation loop of sealing in order to make front filter barrel and straining installation; Also need between straining installation outlet and front filter barrel, recycle pump to be set, send filtrating back to front filter barrel.
(2) close first and third valve, open second, four valves, make the waste water in the wastewater collection bucket pass through straining installation,, then filtrate and discharge through wastewater outlet if the concentration of material reaches emission request in the filtrating of straining installation outlet; If the concentration of material is then closed second, four valves once more greater than emission request in the filtrating of straining installation outlet, open first and third valve; Make front filter barrel and straining installation form the circulation loop of sealing; After material concentration reaches emission request in the filtrating that the straining installation outlet is discharged, close first and third valve, open second, four valves; Make the waste water in the wastewater collection bucket pass through straining installation, filtrating is discharged through wastewater outlet.
As preferred version of the present invention, the recovery method of material is further comprising the steps of in the said titanium dioxide wastewater:
(3) flow that the inlet pressure of straining installation reaches 0.3-0.6MPa or said recovery system in the step (2) is less than 30-50m 3During/h, close first, second, third and fourth valve, change straining installation;
(4) repeating step (1)~(3).
Said material is the metatitanic acid in the Producing Titanium Dioxide process, and the material concentration of waste water is in the wastewater collection bucket: 0.5~50g/l, emission request are material concentration≤0.05g/l.
In step (2), (3), answer during switch valve that blunting of attention is opened, valve-off, pressure is risen gradually or vacuum tightness slowly rises, in order to avoid destroy the established filtering layer that helps.In the step (2), during switch valve,, can make that the concentration of material does not reach emission request in the filtrating if slight damage helps filtering layer; At this moment, then need close second, four valves once more, open first and third valve; Make front filter barrel and straining installation form the circulation loop of sealing, after material concentration reaches emission request in the filtrating that the straining installation outlet is discharged, close first and third valve; Open second, four valves, make the waste water in the wastewater collection bucket pass through straining installation, filtrating is discharged through wastewater outlet; Otherwise in case form the qualified filtering layer that helps, waste water only needs disposable through straining installation, forces to reclaim, and can make the material concentration in the filtrating reach emission request, directly discharging.
With the solid materials of holding back in the straining installation according to the known method discharging of routine; Material after the recovery is pulled an oar into the slurry of 200~250g/l; Send production line back to and produce use,, account for 1~2% of production because yield is less according to the method continuation of routine; Quality product is not had influence, can improve the yield 1~2% of product.
Present method has been utilized the material characteristic in the Producing Titanium Dioxide process; Utilize pump (or vacuum system) with material itself as flocculating aids, be pre-formed one on the filtration medium top layer and help filtering layer through beating the round-robin mode, change clear up to the waste water that emits by mixing; And begin the unitary operation of whole recovery again after meeting certain index; Need not to introduce flocculation agent, production cost is low, and has reduced influence to quality product etc.The present invention has adopted a kind of recovery method that is different from the gravity settling method promptly to force absorption method; By this method; Not only can significantly reduce the floor space of recovery system; And can improve the recovery, and reduce the suspended substance in the waste discharge, can also avoid the above-mentioned variety of issue that settling methods brought.
Description of drawings
Fig. 1 is the recovery system synoptic diagram of material in the titanium dioxide wastewater according to the invention.
Embodiment
The recovery system of material is as shown in Figure 1 in the said titanium dioxide wastewater; Comprise front filter barrel 1, wastewater collection bucket 2, straining installation 3, wastewater outlet 4; The outlet of front filter barrel 1 and wastewater collection bucket 2 is connected to the inlet of straining installation 3 respectively through first valve 5, second valve 6; The inlet of front filter barrel 1 and wastewater outlet 4 are connected to the outlet of straining installation 3 respectively through the 3rd valve 7 and the 4th valve 8, between the front filter barrel 1 and first valve 5, be respectively equipped with between wastewater collection bucket and second valve and be provided with recycle pump 9,10.
Embodiment 1:
Straining installation is 150m 2Plate-and-frame filter press, initial charge pressure is 0.02MPa, and initial material concentration is 34.2g/l in the waste water, and emission request is the solid content≤0.05g/l of material in the waste water.
(1) in front filter barrel 1, prepares material original liquid concentration to 10% with metatitanic acid; Open first and third valve 5,7, close second, four valves 6,8, the closed circuit that makes front filter barrel 1 and filter plant 3 form sealing; Material stoste is circulated in said closed circuit; Concentration≤the 0.05g/l of material in the filtrating that filter plant 3 outlet is discharged makes material be filtered filter medium in the equipment 3 and is trapped in the surface and forms and help filtering layer, and filtrating after filtration, equipment 3 outlets are back to front filter barrel 1;
(2) close first and third valve 5,7, open second, four valves 6,8, make the waste water in the wastewater collection bucket 2 get into straining installation 3, if the concentration≤0.05g/l of material in the filtrating of straining installation 3 outlets then filtrates and discharges through wastewater outlet 4; Concentration>0.05g/l like material in the filtrating; Then close second, four valves 6,8 once more, open first and third valve 5,7, make front filter barrel 1 and straining installation 3 form the circulation loop of sealing, in the filtrating that straining installation 3 outlets are discharged behind material concentration≤0.05g/l; Close first and third valve; Open second, four valves, make the waste water in the wastewater collection bucket pass through straining installation, filtrating is discharged through wastewater outlet;
(3) when the inlet pressure of straining installation in the step (2) reaches 0.3MPa, change straining installation;
(4) repeating step (1)~(3).
Embodiment 2:
Straining installation is 70m 2The tubular type filter, initial charge pressure is 0.03MPa, and initial material concentration is 28g/l in the waste water, and emission request is the solid content≤0.05g/l of material in the waste water.
(1) in front filter barrel 1, prepares material original liquid concentration to 30% with metatitanic acid; Open first and third valve 5,7, close second, four valves 6,8, the closed circuit that makes front filter barrel 1 and filter plant 3 form sealing; Material stoste is circulated in said closed circuit; The concentration of material be≤0.05g/l in the filtrating that filter plant 3 outlet is discharged, and makes material be filtered filter medium in the equipment 3 and is trapped in the surface and forms and help filtering layer, and the equipment 3 of filtrating after filtration exports and is back to front filter barrel 1;
(first and third valve 5,7 is closed in (2), opens second, four valves 6,8, makes the waste water in the wastewater collection bucket get into straining installation 3, if the concentration≤0.05g/l of material in the filtrating of straining installation 3 outlets then filtrates and discharges through wastewater outlet 4; Concentration>0.05g/l like material in the filtrating; Then close second, four valves 6,8 once more, open first and third valve 5,7; Make front filter barrel 1 and straining installation 3 form the circulation loop of sealing, export material concentration≤0.05g/l in the filtrating of discharging until straining installation 3;
(3) when the inlet pressure of straining installation 3 in the step (2) reaches 0.5MPa, change straining installation;
(4) the ordinary method discharging is pressed with straining installation simultaneously in repeating step (1)~(3), and recovered material is returned production system.

Claims (1)

1. the recovery method of material in the titanium dioxide wastewater; It is characterized in that the recovery system that adopts comprises front filter barrel, wastewater collection bucket, straining installation, wastewater outlet; The outlet of front filter barrel and wastewater collection bucket is connected to the inlet of straining installation respectively through first valve, second valve; The inlet of front filter barrel and wastewater outlet are connected to the outlet of straining installation respectively through the 3rd valve and the 4th valve; Between the front filter barrel and first valve, be equipped with recycle pump between wastewater collection bucket and second valve, said recovery method may further comprise the steps:
(1) is that the material stoste of 10-30% places front filter barrel with concentration, opens first and third valve, close second, four valves; Make front filter barrel and filter plant form the closed circuit of sealing; Material stoste is circulated in said closed circuit, and the concentration of material reaches emission request in the filtrating that the filter plant outlet is discharged, and the filter medium that material is filtered in the equipment is trapped in the surface; Formation helps filtering layer, and filtrating after filtration, the equipment outlet is back to front filter barrel;
(2) close first and third valve, open second, four valves, make the waste water in the wastewater collection bucket pass through straining installation,, then filtrate and discharge through wastewater outlet if the concentration of material reaches emission request in the filtrating of straining installation outlet; If the concentration of material is then closed second, four valves once more greater than emission request in the filtrating of straining installation outlet, open first and third valve; Make front filter barrel and straining installation form the circulation loop of sealing; After material concentration reaches emission request in the filtrating that the straining installation outlet is discharged, close first and third valve, open second, four valves; Make the waste water in the wastewater collection bucket pass through straining installation, filtrating is discharged through wastewater outlet;
(3) flow that the inlet pressure of straining installation reaches 0.3-0.6MPa or said recovery system in the step (2) is less than 30-50m 3During/h, close first, second, third and fourth valve, change straining installation;
(4) repeating step (1) ~ (3);
The outlet of straining installation is higher than the inlet of front filter barrel in the said recovery system;
Emission request is material concentration≤0.05g/l.
CN2010102554282A 2010-08-17 2010-08-17 Recovery system and recovery method of materials in titanium white wastewater Active CN101913719B (en)

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Application Number Priority Date Filing Date Title
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CN101913719B true CN101913719B (en) 2012-08-22

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN88211495U (en) * 1988-03-05 1988-12-28 江苏省无锡市扬名金属工具厂 Continuously concentrating separator
US5236595A (en) * 1990-07-06 1993-08-17 International Environmental Systems, Inc., Usa Method and apparatus for filtration with plural ultraviolet treatment stages
CN2461638Y (en) * 2000-09-12 2001-11-28 江苏省宜兴非金属化工机械厂 Ceramic filtering tube and filter for separating micron from titan white wasted water
CN101182081A (en) * 2007-11-26 2008-05-21 中国石油化工股份有限公司 Purified terephthalic acid device refined mother liquor reclaiming utilization system and technique
CN101757814A (en) * 2009-11-30 2010-06-30 薛爱民 Alcohol filtering device and process for recycling filter-aid medium thereof

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN88211495U (en) * 1988-03-05 1988-12-28 江苏省无锡市扬名金属工具厂 Continuously concentrating separator
US5236595A (en) * 1990-07-06 1993-08-17 International Environmental Systems, Inc., Usa Method and apparatus for filtration with plural ultraviolet treatment stages
CN2461638Y (en) * 2000-09-12 2001-11-28 江苏省宜兴非金属化工机械厂 Ceramic filtering tube and filter for separating micron from titan white wasted water
CN101182081A (en) * 2007-11-26 2008-05-21 中国石油化工股份有限公司 Purified terephthalic acid device refined mother liquor reclaiming utilization system and technique
CN101757814A (en) * 2009-11-30 2010-06-30 薛爱民 Alcohol filtering device and process for recycling filter-aid medium thereof

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