CN1631794A - Method for recovering metatitanic acid from acid wastewater of titanium dioxide - Google Patents

Abstract

Disclosed is a method for recover metatitanic acid from the titanium oxide acid waste water, which includes: (1) pump the waste water to high effective coagulator, meanwhile, add high effective coagulant agent polymerize aluminum sulfate of 25-35ppm and nanometic titanium dioxide of 3-5ppm, agitate for 3-8 minutes; (2) pour the mixture obtained into coagulanting pool, staying for 25-35 minutes; (3) pump them into high effective coagulator, add high effective acrylamide of flocculating agent of 8-10ppm, agtate for 3-8 minutes; (4) place them in aggregator of metatitanic acid, waiting them separating and falling downing for 25-35 minutes; (5) abandon the supernatant, then obtain metatitanic acid. The method has fewer dozes of medicine, low investment and high fraction product recovery.

Description

From titanium dioxide acid waste water, reclaim the method for metatitanic acid

Technical field

The present invention relates to from titanium dioxide acid waste water, reclaim the method for metatitanic acid.

Background technology

In the prior art, adopt metatitanic acid or titanium dioxide in the reclaiming by filtration Producing Titanium Dioxide waste water more; Though it can realize described recovery, the medicament usage quantity is big, facility investment is big.

Summary of the invention

The technical problem to be solved in the present invention is, at the defective that prior art exists, proposes a kind of from titanium dioxide acid waste water the method for recovery metatitanic acid, have the advantages that the medicament usage quantity is little, facility investment is few and the rate of recovery is high.

Technical solution of the present invention is that the described metatitanic acid method that reclaims from titanium dioxide acid waste water is:

(1) with titanium dioxide acid waste water with being pumped to the highly effective coagulation device, 1431) and the Nano titanium dioxide (TiO of 3-5ppm add the coagulant polyaluminium sulfate (code name: of 25-35ppm simultaneously ₂), stirred 3-8 minute;

(2) put into coagulation basin, stopped 25-35 minute;

(3), drop into 8-10ppm efficient flocculant polypropylene and mill amine (code name: 3711), stirred 3-8 minute with being pumped in the efficient flocculating device;

(4) put into the metatitanic acid thickener, natural separation sedimentation 25-35 minute;

(5) release supernatant liquor, get metatitanic acid.

Below the present invention made further specify.

Among the present invention, the speed of described stirring can adopt 60-70rpm; The supernatant liquor of discharging in the step (5) is delivered to waste water station and is handled in the lump; The metatitanic acid that obtains that reclaims can send traditional production device to dewater, calcine, and gets its titanium dioxide.

Principle of design of the present invention is, by deep theoretical analysis and comparative experimental research repeatedly, determined preferred to coagulant and efficient flocculant and nano material (being Nano titanium dioxide) and consumption thereof,, set up processing method of the present invention in conjunction with the use of stirring measure; Nano material has improved settling velocity; Make the present invention realize the recovery of metatitanic acid from titanium dioxide acid waste water, and rate of recovery height.

As known from the above, the present invention is a kind of method that reclaims metatitanic acid from titanium dioxide acid waste water, can effectively realize described recovery, and dosing is little, facility investment is few, the rate of recovery can reach 95.90-97.60%, and cost recovery is low.

Description of drawings

Fig. 1 has the described highly effective coagulation device of same structure and a kind of example structure synoptic diagram of efficient flocculating device.

In the drawings:

The 1-shell, the 2-opening for feed, the 3-discharge port,

4-+45 ° of blade, 5--45 ° of blade, 6-axle.

Embodiment

The step of described recovery method is:

(1) with titanium dioxide acid waste water (PH=1-2) with being pumped to the highly effective coagulation device, add the polyaluminium sulfate of 30ppm and the Nano titanium dioxide (TiO of 4ppm simultaneously ₂), stirred stirring velocity 60-70rpm 5 minutes;

(2) put into coagulation basin, stopped 30 minutes;

(3) with being pumped in the efficient flocculating device, drop into the 10ppm polypropylene and mill amine, stirred 5 minutes;

(4) put into the metatitanic acid thickener, natural separation sedimentation 30 minutes;

(5) release supernatant liquor, get metatitanic acid.

The structure of used highly effective coagulation device and efficient flocculating device as shown in Figure 1.

Claims (1)

1, a kind of method of from titanium dioxide acid waste water, receiving metatitanic acid, it is:

(1) with titanium dioxide acid waste water with being pumped to the highly effective coagulation device, add the coagulant polyaluminium sulfate of 25-35ppm and the Nano titanium dioxide of 3-5ppm simultaneously, stirred 3-8 minute;

(2) put coagulation basin, stopped 25-35 minute;

(3) with being pumped in the efficient flocculating device, drop into 8-10ppm efficient flocculant polypropylene and mill amine, stirred 3-8 minute;

(4) put into the metatitanic acid thickener, natural separation sedimentation 25-35 minute;

(5) release supernatant liquor, get metatitanic acid.

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