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Method for recovering scandium and titanium from titanium dioxide waste water

A technology of titanium dioxide wastewater and recovery method, which is applied in the field of scandium and titanium recovery in titanium dioxide wastewater, which can solve the problems of high price and late launch of P507 products, and achieve the effects of small site, easy large-scale production, and reduced production costs

Active Publication Date: 2012-10-03
HUNAN ORIENTAL SCANDIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, although P507 and P204 are both acid extractants, due to the late launch of P507 products and the high price, no one has systematically studied the benefits of replacing P204 with P507 before. agent

Method used

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  • Method for recovering scandium and titanium from titanium dioxide waste water
  • Method for recovering scandium and titanium from titanium dioxide waste water
  • Method for recovering scandium and titanium from titanium dioxide waste water

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 2m 3 1000L of titanium dioxide wastewater in the reactor, (acidity 2.5mol H 2 SO 4 , containing scandium 16mg / L, titanium 6g / L, TiO 2 / Sc 2 o 3 =375 / 1), adding 50L of P507 and 4% TBP and the remaining volume of kerosene extractant with a concentration of 20% by volume, for single-stage extraction, stirring for 20 minutes, stirring speed 120r / min, equilibrium time 15 Minutes; static stratification, scandium extraction rate 98%, titanium extraction rate 10%, raffinate through oil trap to centrifuge (oil-water separator) or filter membrane to separate oil, and then treated with oil-absorbing felt, the organic Phase content 100mg / L, discharge.

Embodiment 2

[0029] 500L of loaded organic phase after extraction in Example 1, put into 1.5m 3 In the reaction kettle, first wash 3 times with 3N hydrochloric acid, O / A=1 / 1, then use 2mol / L NaOH lye 800L single-stage back extraction, temperature 70C°, stir for 25 minutes, stirring speed 120r / min; static Layered, the stripping rate of scandium is 98%, and the stripping rate of titanium is 98%. 12mol / L H 2 SO 4 Soluble, acidity 3mol / L H 2 SO 4 , containing scandium 1.35g / L, titanium 48g / L, TiO 2 / Sc 2 o 3 =36 / 1.

Embodiment 3

[0031] With the solution 500L in embodiment 2, put into 2.5 m 3 In the reaction kettle, adjust the acidity to 6M, add 50L of extraction agent of 25% P507 and 6% TBP and the remaining volume of kerosene by volume percentage concentration, carry out the second single-stage extraction, stir for 20 minutes, and the stirring speed 120r / min, equilibration time 20 minutes; static layering, scandium extraction rate 95%, titanium extraction rate 12%, the organic phase is back-extracted again, the conditions are the same as in Example 2, after the back-extracted product is dissolved in sulfuric acid, the pH is controlled to be 2 , Scandium oxalic acid precipitation, scandium oxalate was burned at 800C ° for 5 hours to obtain 98% crude scandium oxide.

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Abstract

The invention discloses a method for recovering scandium and titanium from titanium dioxide waste water, which comprises steps as follows: performing single-stage extraction by using an extracting agent (P507 + TBP + kerosene), wherein the phase ratio O / A is between 1: 50 and 1: 5 and the equilibrium time is 10 to 20 minutes; and then, performing back extraction by using alkali, filtering, dissolving back extracted products by sulfuric acid, and performing reextraction for the obtained solution; dissolving alkali cakes in second back extracted products by acid, and precipitating scandium by oxalic acid; and firing the precipitate at 700-1000 degree C, so as to obtain crude scandium oxide with purity degree higher than 98%. And high-purity scandium oxide can be obtained through further purification. The method can ensure recovery of scandium, and recovers part of titanium at the same time, avoids the procedures of washing titanium by sulfuric acid and hydrogen peroxide as well as removing titanium by hydrolysis, and adopts re-extraction for recovering scandium and titanium, so that the recovery cost of scandium is lowered. The method has the advantages of environmental protection and simple process, has high scandium recovery rate, and is applicable to large-scale production.

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 in titanium white waste acid 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 ton of titanium dioxide p...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/40C22B34/12C22B59/00
Inventor 钱晓泰陈卫平陈青松王晓平刘荣丽
Owner HUNAN ORIENTAL SCANDIUM