Method for recovering scandium from zirconium oxychloride acid pickle, and extracting agent for method

A technology of zirconium oxychloride and extractant, which is applied in the field of rare earth recovery, can solve problems such as the inability to recover scandium, and achieve the effect of large processing capacity

Inactive Publication Date: 2012-07-25
HUNAN ORIENTAL SCANDIUM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The purpose of the present invention is to provide a method and extractant for recovering scandium from zirconium oxychloride waste acid

Method used

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  • Method for recovering scandium from zirconium oxychloride acid pickle, and extracting agent for method
  • Method for recovering scandium from zirconium oxychloride acid pickle, and extracting agent for method

Examples

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Embodiment

[0031] All materials and instruments used in the following examples are commercially available.

[0032] Extraction rate calculation formula: extraction rate = (scandium content in waste acid solution - scandium content in aqueous phase after extraction) / scandium content in waste acid solution * 100%;

[0033]Scandium, titanium, zirconium, and rare earth elements in the solution are determined by conventional titration colorimetry and ICP instrument method. Sc in roasted product 2 o 3 The content was determined by conventional titration.

example 1

[0035] Extraction: Take 100ml of waste acid solution in the production process of zirconium oxychloride, acidity 4N, Sc0.4g / L, Ti16g / L, Zr21g / L, Th0.6g / L, rare earth 4.5g / L, put it into 1L liquid separation In the funnel, add 500ml extractant, the ratio O / A is 5 / 1. The extractant is composed of 79% by volume of P350 and 21% by volume of P507, adding kerosene with 70% by volume of the extractant as a diluent, shaking and extracting for 10 minutes, static layering at room temperature, and Sc0.007g / L in the equilibrium water phase, Ti13.0g / L, Zr14.99g / L, Th0.47g / L, rare earth 4.46g / L,. The extraction rate of scandium in this step is 98.2%. The titanium extraction rate is 18.7%. The extraction rate of zirconium is 28.6%. The extraction rate of thorium is 21.6%, and the extraction rate of rare earth is 0.8%

[0036] Washing: use 500ml of 4N HCl+1NH2O2, the ratio O / A is 1 / 1, wash the organic phase 3 times to obtain the water wash phase. The loss rate of scandium after water was...

example 2

[0041] Extraction: Take 150ml of waste acid solution in the production process of zirconium oxychloride, acidity 7N, Sc0.25g / L, Ti12.8g / L, Zr16.8g / L, Th0.48g / L, rare earth 3.5g / L, put into In a 1L separatory funnel, add 150ml of extractant, and the O / A ratio is 1 / 1. Add an extractant composed of 99% by volume of P350 and 1% by volume of P507, take 50% by volume of kerosene as a diluent, shake and extract at 25°C for 10 minutes, statically separate layers, and balance the Sc0. 025g / L, Ti11.93g / L, Zr14.1g / L, Th0.42g / L, rare earth 3.49g / L,. The extraction rate of scandium in this step is 90%. The titanium extraction rate is 6.8%. The extraction rate of zirconium is 16.1%. The extraction rate of thorium is 12.5%, and the extraction rate of rare earth is 0.2%

[0042] Washing: the organic phase was washed 3 times with 300 ml of 7N HCL to obtain a water wash phase. The loss rate of scandium after water washing is 6.5%, and some impurities such as titanium, thorium, zirconium an...

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Abstract

The invention provides a method for recovering scandium from zirconium oxychloride acid pickle, and an extracting agent for the method; and the extracting agent is a mixture comprising 70-99% of P350 and 1-30% of P507 according to the volume ratio. The extracting agent is especially suitable for extracting the scandium from the acid pickle so as to effectively separate titanium, zirconium, thorium and other rare earth impurities in the acid pickle; the acid pickle can be treated only by the conventional scandium recovery method; furthermore, the total yield of the scandium is more than 80%, so that the treatment capacity is high, and industrialized continuous production can be realized.

Description

technical field [0001] The present invention relates to the field of rare earth recovery, in particular, to a method for recovering scandium from zirconium oxychloride waste acid solution, and another aspect of the present invention also provides an extractant used in the aforementioned method. Background technique [0002] Rare earths are widely used, especially in high-tech industries, such as new energy materials and high-strength aluminum alloys. At present, the main sources of rare earths are ionic rare earth ores, monazite ores, and bastnaesite. Scandium in rare earth elements is special and cannot be produced from the above mines. Scandium is mainly obtained from associated ores such as tungsten ore, aluminum ore, titanium Extracted from mines etc. The content of scandium in titanium dioxide wastewater can reach 10-15ppm / L. At present, the recycling of scandium mainly focuses on the treatment of titanium dioxide wastewater. The wastewater produced by zirconium oxych...

Claims

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Application Information

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IPC IPC(8): C22B59/00C22B3/40
CPCY02P10/20
Inventor 陈卫平刘荣丽钱晓泰陈青松欧阳剑雄高荣
Owner HUNAN ORIENTAL SCANDIUM
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