Method for extracting and recycling scandium and titanium from acid leaching solution containing scandium and titanium

A leachate and extraction technology, applied in the field of extraction and recovery of scandium and titanium, can solve the problems of incomplete separation and cumbersome separation, and achieve good effect, simple process flow and low production cost

Active Publication Date: 2016-10-26
贵州鑫亚矿业有限公司 +1
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Problems solved by technology

[0004] Aiming at the above-mentioned technical problems in the related art, the present invention proposes a method for extracting and recovering scandium and titanium from scandium-containing titanic acid leaching solution, which can solve the problem of extracting scandium and titanium respectively by organic phosphonic acid extractants and amine extractants under normal conditions. Subsequent separation is complicated due to incomplete separation of iron, scandium and titanium

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  • Method for extracting and recycling scandium and titanium from acid leaching solution containing scandium and titanium

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Embodiment 1

[0035] Guizhou Qinglong anatase containing TiO 2 4.00%~6.00%, including Sc 2 o 3 60g / t~120g / t. TiO 2 It mainly exists in the form of independent mineral anatase, and no independent mineral of scandium is found in the ore. Scandium element mainly occurs in clay minerals such as kaolinite and sericite, and secondly occurs in limonite and anatase. Metal minerals in raw ore mainly include anatase, limonite, and a small amount of ilmenite, magnetite, galena, pyrite, etc.; gangue minerals mainly include kaolinite, followed by quartz, silk (white ) mica, chlorite, plagioclase, zircon, etc. Technological mineralogy research shows that titanium is mainly produced in the form of fine-grained anatase wrapped in silicate and quartz, with extremely fine particle size, and secondly occurs in limonite in the form of isomorphism, which belongs to Very difficult to select ore. Such as figure 1 As shown, the ore is leached with two-stage sulfuric acid intensification, and the H 2 SO 4...

Embodiment 2

[0037] A titanium dioxide factory in Yunnan has an annual output of 80,000 tons of titanium dioxide and 700,000 tons of titanium dioxide waste acid. The titanium dioxide factory uses calcium carbide slag to neutralize the titanium dioxide waste acid, and the gypsum produced is sent to other places for treatment. high. Its titanium dioxide waste acid contains TiO 2 4.36g / L, Sc 2 o 3 14.28 mg / L, TFe 30 g / L, H 2 SO 4 375 g / L, and the content of scandium is relatively high, so it has high utilization value. Such as figure 1 As shown, extract and separate scandium and titanium from the titanium white waste acid, using 10% P204-5% 2-octanol-85%260 # Kerosene, compared with O / A=1:6, three-stage countercurrent extraction of scandium, and then using 3 mol / L NaOH solution, compared with O / A=10:1, one-stage back extraction of scandium, the extraction rate of scandium is ≥99% , stripping rate ≥ 99%, comprehensive recovery rate ≥ 98%, Sc in the stripping precipitation of scandium...

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Abstract

Disclosed is a method for extracting and recycling scandium and titanium from an acid leaching solution containing scandium and titanium. When the acid solution containing both scandium and titanium is processed, scandium is preferentially extracted by making full use of the features that the concentration of the acid leaching solution is relatively high, and the high acidity can restrain iron and titanium and improve the selectivity of organic phosphonic acid extracting agents to scandium, a residue rich in scandium is obtained by the use of a NaOH solution through back extraction, titanium is extracted by the use of amine extracting agents which are high in selectivity to titanium after scandium is extracted, titanium is processed by a NH4Cl-H2O2 mixed solution through back extraction, a back extraction solution concentrates and crystallizes, NH4Cl crystals are separated out, and a solution rich in titanium is obtained. By the adoption of the method, effective recycling of scandium and titanium is achieved, the problem that when scandium and titanium are extracted by the use of the organic phosphonic acid extracting agents and the amine extracting agents respectively under the usual conditions, due to the fact that iron, scandium and titanium are not separated thoroughly, the follow-up separation process is tedious is solved, the process is short, the cost is low, comprehensive recovery of low-concentration scandium and titanium in the acid leaching solution and titanium dioxide production waste acid is achieved, and the method has the advantages of being simple in technological process, high in scandium and titanium concentration ratio, thorough in separation and low in production cost, and free of pollution.

Description

technical field [0001] The invention relates to the technical field of mineral processing engineering, in particular to a method for extracting and recovering scandium-titanium from scandium-containing titanic acid leaching solution. Background technique [0002] Metal scandium and its compounds have many excellent properties, and have irreplaceable and important uses in metallurgy, national defense, electronics, medicine, aerospace, superconductors and other cutting-edge technology fields, and are important strategic reserve resources in my country. At present, waste water (especially waste acid produced by titanium dioxide), waste residue, smoke dust, red mud, etc. are mainly used as raw materials to extract scandium oxide first, and then to refine scandium metal. Titanium mineral is the main carrier mineral of scandium (scandium in bauxite is also mainly found in anatase). Therefore, scandium and titanium often coexist in raw materials for extracting scandium, and the m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B34/12C22B59/00C22B3/38C22B3/28
CPCC22B34/1259C22B59/00C22B3/28C22B3/38Y02P10/20
Inventor 高利坤洪志蒙正炎
Owner 贵州鑫亚矿业有限公司
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