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Method for recovering scandium and vanadium from chlorination-process titanium dioxide wastewater

A technology of titanium dioxide wastewater and chlorination method, applied in the direction of improving process efficiency, etc., can solve the problems of small specific gravity, few manufacturers adopt, slow phase separation, etc., achieve high-efficiency extraction, simple process operation, and high enrichment multiple Effect

Active Publication Date: 2020-04-10
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

The extraction under the hydrochloric acid system is slow due to the small specific gravity and phase separation, so few manufacturers currently use it.

Method used

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  • Method for recovering scandium and vanadium from chlorination-process titanium dioxide wastewater
  • Method for recovering scandium and vanadium from chlorination-process titanium dioxide wastewater
  • Method for recovering scandium and vanadium from chlorination-process titanium dioxide wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Such as figure 1 Shown, the method for reclaiming scandium vanadium in the chlorination process titanium white wastewater of the present embodiment comprises the steps:

[0025] 1. Preparation of extraction material liquid of titanium dioxide waste acid by chlorination method: pour 2 / 3 volume of waste acid of titanium dioxide by chlorination method into the liquid preparation barrel (used as a reaction kettle); then use industrial mixed alkali to adjust the pH value to 0.2, and stir React for 2 hours, filter, and the filtrate is the extraction material liquid of titanium white waste acid in the chlorination process. The loss rate of scandium and vanadium in the liquid preparation process is below 1%. Iron 50g / L in the filtrate; Manganese 15g / L; Aluminum 8g / L; Scandium 0.138g / L; Vanadium 1.522g / L; Titanium 0.04g / L;

[0026] 2. Extraction: prepare a composite extractant according to the volume ratio, take 20% diisooctyl phosphate + 2% diisooctyl dithiophosphinic acid + ...

Embodiment 2

[0028] In the method for recovering scandium and vanadium in the chlorination titanium dioxide wastewater of this embodiment, the influence of acidity on the loss of scandium and vanadium is adjusted during the liquid preparation process. Take 600mL of titanium dioxide waste acid from the chlorination process, the initial hydrogen ion concentration is 1.47mol / L, adjust the pH value with industrial mixed alkali (solid), filter and analyze the results:

[0029] name Scandiummg / L Vanadium mg / L Nickel mg / l Titanium mg / l Zirconium mg / l Volume mL filter residue Liquid 139 1527 326 392 355 600 none PH0.20 138 1522 321 40 30 612 8.1g (wet) PH0.87 135 1491 317 22 17 615 16.3g (wet) PH1.47 127 1455 299 14 5 591 21.7g (wet) PH2.13 89 922 293 3 5 576 38.5g (wet) PH2.47 63 813 291 4 5 564 44.1g (wet)

[0030] The amount of filter residue obtained in the liquid preparation process of thi...

Embodiment 3

[0032] The method for recovering scandium and vanadium in the chlorination titanium dioxide wastewater of this embodiment, the influence of the acidity of the chlorination titanium dioxide waste acid extraction liquid on the extraction rate during the extraction process. The extractant consists of 15% di-octyl phosphate + 10% di-iso-octyl dithiophosphinic acid + 10% trialkylphosphine oxide + 65% sulfonated kerosene, and the saponification rate is 50%. The extraction ratio O / A=1:1, the feed liquid is the extraction feed liquid of Example 2; the extraction time is 10 min; the number of extraction stages n=1.

[0033]

[0034]

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Abstract

The invention discloses a method for recovering scandium and vanadium from chlorination-process titanium dioxide wastewater, which comprises the steps of S1, regulating the pH value of chlorination-process titanium dioxide waste acid, and carrying out filter pressing to obtain a chlorination-process titanium dioxide waste acid extraction feed liquid and a titanium-zirconium enriched product; S2, carrying out centrifugal countercurrent contact extraction on the saponified composite extracting agent and the chlorination-process titanium dioxide waste acid extraction feed liquid, and simultaneously extracting scandium and vanadium in the chlorination-process titanium dioxide waste acid extraction feed liquid into an organic phase under low acid to obtain raffinate and a scandium-rich vanadium-rich organic phase; and S3, adding an oxidizing agent into the acid liquor to serve as a vanadium reverse-extraction liquid, performing reverse extraction of vanadium in a multi-stage centrifugal countercurrent contact mode, and reversely extracting vanadium from the scandium-rich vanadium-rich organic phase into the water phase to obtain a vanadium-containing solution and a scandium-rich organicphase; S4, hydrolyzing the vanadium-containing solution to obtain red vanadium; and S5, taking the alkali liquor as a scandium reverse-extraction liquid, reversely extracting scandium from the scandium-rich organic phase to obtain the residual alkali liquor, a blank organic phase and a scandium enriched product, and further purifying to obtain 99% Sc2O3.

Description

technical field [0001] The invention relates to the technical field of recovery of valuable elements in industrial waste water, in particular to a method for simultaneously recovering scandium and vanadium from chlorination titanium white waste water. Background technique [0002] Both vanadium and scandium are an important strategic resource. Vanadium is the best modifier for steel. Vanadium pentoxide is mainly used to smelt ferrovanadium and is widely used in metallurgy, chemical industry, aerospace, atomic energy and vanadium battery fields; the most important use of scandium is new energy materials, such as solid fuels Scandium oxide stabilized zirconia electrolyte ceramic materials in batteries, nuclear energy shielding materials and solar battery materials. Scandium is used to manufacture new electric light source materials such as scandium sodium lamps, gallium scandium GSGG laser materials and neutron filter materials, and is also the best modifier for aluminum allo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B3/38C22B34/22C22B59/00
CPCC22B7/006C22B34/22C22B59/00C22B3/408Y02P10/20
Inventor 陈卫平聂东红彭业云周晶晶司利沙薛攀石小平雷裕敏徐绍德程长鑫
Owner 河南荣佳钪钒科技有限公司
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