Method for recovering scandium in waste acidic water from titanium dioxide production

A recovery method and technology of waste acid water, which is applied in the field of recovery of rare earth element scandium, can solve the problems of ineffective use of dilute sulfuric acid heat, troublesome preparation of lotion, etc., and achieve the effects of avoiding a large amount of decomposition, convenient operation and simplified process

Inactive Publication Date: 2012-09-26
HUNAN BAOYING NEW MATERIALS
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  • Abstract
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AI Technical Summary

Problems solved by technology

In this way, the lotion preparation is cumbersome, and the heat generated by the d

Method used

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Examples

Experimental program
Comparison scheme
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Example Embodiment

[0019] Example 1:

[0020] A method for recovering scandium in waste acid water from titanium dioxide production, which includes the following steps:

[0021] ⑴Extraction: The raw material titanium dioxide waste acid contains scandium at a concentration of 15.68㎎ / L. In the extraction tank, bis(2-ethylhexyl phosphoric acid) P204-tributyl phosphate TBP-kerosene extractant is used for the titanium dioxide production waste acid water. Level 3 to Level 6 (level 3 in this example) cascade extraction, calculated by volume, P204 is 6% to 15% (6% in this example), and TBP is 4% to 6% (in this example, 6%). ﹪), the rest is kerosene, the volume ratio of extractant to waste acid is 1:5-30, (this example is 1:10), the mixing time is 10min-30min (this example is 10min), the raffinate contains Scandium is 0.83㎎ / L, and the extraction rate of scandium is 90%~99% (94.7% in this example), and a supported organic phase containing scandium is obtained;

[0022] ⑵Washing: Use 1mol / L~3mol / L (2mol / L in th...

Example Embodiment

[0029] Example 2:

[0030] In step (2), use 2mol / L sulfuric acid and 27% hydrogen peroxide as detergent for the scandium-containing loaded organic phase obtained in step (1). After 15 stages of cascade washing, the volume ratio of loaded organic phase to sulfuric acid is 1:1 / 2, the amount of hydrogen peroxide added is 4% of the volume of sulfuric acid, the first stage is loaded with organic phase, and the last stage is sulfuric acid; in order to avoid the decomposition of hydrogen peroxide during the stirring process, the present invention is between the penultimate stage and the penultimate eighth stage Hydrogen peroxide is added in multiple stages. At the same time, in order to make full use of the excess hydrogen peroxide, the present invention adds hydrogen peroxide at intervals from the penultimate stage to the eighth stage. In this embodiment, hydrogen peroxide is added at the fourth and sixth stages to measure the first TiO in the first level residual liquid 2 The concent...

Example Embodiment

[0033] Example 3:

[0034] In step (4), the stripping solution obtained in step (3) is filtered to obtain a scandium-rich alkali cake. The scandium-rich alkali cake is heated and dissolved in the reactor with 2mol / L hydrochloric acid, and boiled to make the titanium fully desorbed in water, and filtered to obtain chlorine Scandium solution

[0035] The same as in Example 1.

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Abstract

The invention discloses a method for recovering scandium in waste acidic water from titanium dioxide production, which is simple in washing liquid preparation and convenient to use. The method is characterized by comprising the following steps of extraction, washing, back extraction, acidic dissolution, oxalic acid precipitation and scorching. The method is simple in process and convenient to operate, dilute sulphuric acid and hydrogen peroxide are respectively added in a cascade washing process, so that the washing liquid is maintained at a certain temperature to facilitate titanium elution in the washing process, and the hydrogen peroxide is prevented from being decomposed massively at high temperature in an acidic medium, meanwhile, in several stages after feeding of hydrogen peroxide, an organic phase washed with hydrogen peroxide is further washed with pure sulphuric acid, and free hydrogen peroxide is washed for recycle so as to reduce the loss of hydrogen peroxide; and in addition, in the back extraction process, a back extraction solution is retained in a reaction kettle for repeated back extraction, so that the frequency of filter pressing is reduced, a process is simplified and the loss of Sc is reduced.

Description

technical field [0001] The invention relates to a method for recovering scandium, a rare earth element, in particular to a method for recovering scandium in waste acid water from titanium dioxide production. Background technique [0002] Scandium is one of the rare earth elements, and its content in nature is very small. The content of scandium in the earth's crust is only 5×10 -6 , not only is much lower than other light elements, but the content of rare earth elements is only moderate, only about 1 / 10 of cerium. However, scandium has a wide range of uses, such as scandium sodium lamps with power saving, long service life, strong fog breaking ability, and good luminous efficiency, solar photovoltaic cells, gamma ray sources, alloy materials, organic chemical additives, etc. Wait. Due to its rare content, the extraction process is extremely complicated and the cost is high, so the price is also expensive. It is only used as an additive in most fields and is known as a magi...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B7/00
Inventor 刘卫杨泱崔小震陈月华
Owner HUNAN BAOYING NEW MATERIALS
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