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Method for extracting scandium and other rare earths from zirconium oxychloride waste acid solution

A technology of zirconium oxychloride and waste acid solution, which is applied in the field of extracting scandium and other rare earths, can solve the problems that the purity level of scandium oxide needs to be improved, and does not involve the recovery, extraction and utilization of rare earths, so as to reduce the loss of scandium, reduce investment, and process A large amount of effect

Active Publication Date: 2017-07-21
全南晶环科技有限责任公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, Chinese patent applications with publication numbers CN102605199A, CN103318940A, CN1061246, CN102205986A and CN103695671A disclose various methods for separating zirconium from waste acid containing scandium and zirconium and recovering scandium oxide, but none of them involve the recovery of other rare earths in waste acid Extraction and utilization, and the purity level of recovered scandium oxide needs to be improved, so exploring the recovery and reuse of zirconium oxychloride waste acid liquid has the significance of promoting hydrometallurgy and waste acid treatment

Method used

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  • Method for extracting scandium and other rare earths from zirconium oxychloride waste acid solution
  • Method for extracting scandium and other rare earths from zirconium oxychloride waste acid solution

Examples

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Embodiment 1

[0035] A method for extracting scandium and other rare earths from zirconium oxychloride waste acid solution, see figure 1 , figure 2 , including the following steps:

[0036] (1) Flocculation and impurity removal: filter the concentrated zirconium oxychloride waste acid solution with polyacrylamide (PMA) organic flocculant, and adjust the concentration of the slurry to facilitate plate and frame filter silicon slag to obtain clear liquid I;

[0037](2) Scandium enrichment: In a box-type mixing and settling tank, use extractant Ⅰ to perform 6-stage cascaded countercurrent extraction on clear liquid Ⅰ to obtain organic phase Ⅰ and raffinate Ⅰ, and raffinate Ⅰ contains about 15 pmm of scandium , the extraction rate was 97%; after 8 cascaded countercurrent washing of organic phase I with 6mol / L hydrochloric acid solution as detergent I, 25 cascaded countercurrent washing was carried out on organic phase I with 8 mol / L nitric acid solution as stripping agent I. Stage countercur...

Embodiment 2

[0046] A method for extracting scandium and other rare earths from zirconium oxychloride waste acid liquid, comprising the following steps:

[0047] (1) Flocculation and impurity removal: filter the concentrated zirconium oxychloride waste acid solution with polyacrylamide (PMA) organic flocculant, and adjust the concentration of the slurry to facilitate plate and frame filter silicon slag to obtain clear liquid I;

[0048] (2) Scandium enrichment:

[0049] (2-1) Enrichment stage extraction: Weigh 600ml of clear liquid Ⅰ (the clear liquid Ⅰ contains scandium 0.7g / L, iron 20 g / L, titanium 15 g / L, zirconium 25 g / L, rare earth 10 g / L ), the acidity is 3.5~5mol (the original acid material is used directly, no need to adjust the acidity), put it into a 1000ml pear-shaped separatory funnel, add 200ml of extraction agent Ⅰ, compared to O / A=1:3, extract at room temperature for 5min and then separate phase, to obtain the loaded organic phase I and the aqueous raffinate I. After equili...

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Abstract

The invention discloses a method for extracting scandium and other rare earth from zirconium oxychloride acid pickle. The method comprises the following steps that (1), the zirconium oxychloride acid pickle is subjected to floculation adsorption slag removing, scandium element enrichment, acid modulation and impurity removing, scandium element purification and rare earth recycling, and high-purity scandium strip liquor and extraction raffinate containing rare earth are obtained; (2), the high-purity scandium strip liquor is subjected to oxalic acid precipitation and high-temperature calcination to prepare high-purity scandium oxide; and (3), the extraction raffinate containing the rare earth is subjected to precipitation zirconium removing, extraction iron removing and carbonate adding reactions to obtain rare earth carbonate. The method belongs to the technical field of hydrometallurgy and waste acid treatment and comprehensive utilization. According to the method, the high-purity scandium oxide powder with the grade being above 99.9% can be obtained; and meanwhile, the other rare earth is recycled in a manner of rare earth carbonate enriched products, the total recycling rate of the rare earth is larger than 80%, the investment is small, the manual requirement is small, the handling capacity is large, and industrial continuous production can be achieved.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy and waste acid treatment and comprehensive utilization, and specifically relates to a method for extracting scandium and other rare earths from zirconium oxychloride waste acid liquid. Background technique [0002] Rare earths are widely used and enjoy the reputation of "industrial monosodium glutamate" and "mother of new materials". They are indispensable raw materials for many high-end industries. my country's rare earth reserves account for 30% of the world, and its trade volume accounts for 90%. However, due to environmental and cost considerations, my country has implemented a batch-by-batch quota system for the mining, selection, and smelting of rare earths. [0003] The main sources of rare earths are ionic rare earth ore, monazite ore and bastnaesite, but the rare earth element scandium is special and cannot be produced from the above mines. Its distribution in the earth's crust is...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B59/00C22B3/40
CPCY02P10/20
Inventor 邓杰董雪平徐欣雷忠王利广陈其森王越红钟月明
Owner 全南晶环科技有限责任公司
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