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Method for recovering scandium and titanium in titanium white wastewater

A technology of titanium dioxide waste water and recovery method, which is applied in the direction of improving process efficiency, can solve the problems of neglecting the recovery of titanium element and not taking it into consideration, and achieves the effects of environmental protection technology, improved yield and reduced scandium cost.

Active Publication Date: 2012-09-12
河南荣佳钪钒科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are also those who do not wash titanium and use TBP to extract scandium, and titanium remains in the solution. These methods often ignore the recovery of titanium, and all methods do not consider the secondary pollution caused by the organic phase in the water phase after extraction.

Method used

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  • Method for recovering scandium and titanium in titanium white wastewater
  • Method for recovering scandium and titanium in titanium white wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1000 liters of titanium dioxide wastewater in the 2M3 reactor, (acidity 5Mol H 2 SO 4 , containing scandium 16mg / liter, titanium 6g / liter, iron 30g / liter), add 50 liters of P2O4 and 4% TBP and the kerosene of remaining volume by volume fraction, carry out single-stage extraction, stir 20 minutes, stir The speed is 100 rpm, and the equilibrium time is 15 minutes; static stratification, the extraction rate of scandium is 90%, and the extraction rate of titanium is 40%. After linoleum treatment, the organic phase content in the water phase is 50mg / L, and it is discharged.

Embodiment 2

[0021] 500 liters of the organic phase after extraction in Example 1 was put into a 1.5M3 reaction kettle, and 500 liters of single-stage back-extraction with 1molNaOH and 0.7molNaCl lye were used, at a temperature of 70°C, stirred for 15 minutes, and the stirring speed was 120 rpm ;Static stratification, the stripping rate of scandium is 98%, and the stripping rate of titanium is 98%. Dissolve the stripped alkali cake with 9molH2SO4, adjust the pH to 0.5 with Na2CO3, heat to boiling for 10 minutes, hydrolyze titanium, and recover titanium by filtration; the hydrolysis rate of titanium is more than 90%, and the loss of scandium is 1%, Ti / Sc= 50:1.

Embodiment 3

[0023] 500 liters of mother liquor after hydrolysis in embodiment 2, put into 1.5M3 Reactor, first use H2SO4Adjust acidity 5mol and carry out second extraction and back extraction again, condition is the same as embodiment 1, embodiment 2. After the second hydrolysis, Ti / Sc=1:1, control pH=2, precipitate scandium with oxalic acid, and burn at 800C° for 1 hour to obtain 95% crude scandium oxide.

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Abstract

The invention discloses a method for recovering scandium and titanium from wastewater in the production of titanium white powder. The method comprises the following steps of: carrying out single stage extraction in titanium white wastewater with P2O4, TBP and kerosene, wherein a phase ratio O / A is 1:50 to 1:10, and balance time is 10-20 min; then, stripping with alkali, filtering and dissolving a stripped substance with acid; heating a solution in a reaction kettle, adjusting a PH value, hydrolyzing titanium, filtering and recovering titanium, repeating the above process to process supernatant fluid, secondarily extracting and dissolving a stripped substance alkali cake with acid; precipitating scandium with oxalic acid and burning to obtain scandium oxide with the purity of 95 percent; and further refining to obtain high-pure scandium oxide. In the invention, titanium is recovered under the condition of ensuring scandium recovery without adopting a titanium washing process of sulfuric acid and hydrogen peroxide, and a hydrolysis mode is adopted to recover titanium, and the recovery cost of scandium is decreased. In addition, a degreasing device and oil-absorbing felt are adopted in waste liquid generated after extraction. The invention has the advantages of environmental protection and simple process, the wastewater contains the organic phase of less than 50 mg / l and reaches an emission standard.

Description

technical field [0001] The invention relates to a method for recovering valuable elements in industrial waste water, in particular to a method for recovering scandium and titanium and purifying scandium oxide from titanium white waste water produced in the production process of titanium dioxide. Background technique [0002] Scandium is a rare element, which is mainly extracted from other minerals, such as rare earth ore, ilmenite, bauxite, tungsten ore, etc. With the expansion of the civilian application of scandium, a large amount of cheap scandium is needed. The cost is high, and a large amount of scandium is lost from the titanium dioxide wastewater without recycling. There are two main production methods of titanium dioxide (titanium dioxide): chloride method and sulfuric acid method, and sulfuric acid method is mainly used in my country; in the process of producing titanium dioxide by sulfuric acid method, a large amount of waste acid water will be generated, and every...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B34/12C22B59/00
CPCY02P10/20
Inventor 李孝良陈卫平杨钊谭东正杨庆山陈青松周俊军
Owner 河南荣佳钪钒科技有限公司
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