Method for extracting scandium oxide from tungsten steel slag

A scandium oxide and steel slag technology is applied in the field of separation and recovery of scandium from tungsten steel slag, which can solve the problems of difficulty in extracting scandium oxide and low acidity of scandium-containing feed liquid, and achieves the effects of solving emulsification problems, separating fast and improving quality.

Inactive Publication Date: 2012-09-19
龙颖
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  • Application Information

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Problems solved by technology

The existing technology for extracting scandium from titanium white mother liquor has low acidity (6N) and low TiO2 content (about 4 g/L), while the scandium content in tungsten steel slag is about 250 g/ton After leaching with sulfuric acid, the TiO2 content in the acid leaching solution is a...

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  • Method for extracting scandium oxide from tungsten steel slag
  • Method for extracting scandium oxide from tungsten steel slag
  • Method for extracting scandium oxide from tungsten steel slag

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Embodiment Construction

[0012] The operation steps of the present invention will be further described below with examples.

[0013] according to figure 1 The sequence shown illustrates the operational steps for carrying out this embodiment.

[0014] Leach 1.8 tons of tungsten steel slag with 1800 liters of 60% H2SO4 solution, that is, 1542 liters of material liquid ① for extraction obtained through steps ① and ②, which contains Sc2O356 mg / L, TiO255.83 g / L, Fe 21.25 g / L, H+12.8N; Feed liquid ②1009L, containing Sc2O384mg / L, TiO238.61g / L, Fe 31.50g / L, H+9.45N.

[0015] Feed liquid 1. use 20% di-(2-ethylhexyl) phosphoric acid (P204)+4% tributyl phosphate (TBP)+kerosene solvent in (3a), according to the volume of organic phase / water phase is 1:9 Compared with single-stage extraction, the raffinate contains Sc2O35.6 mg / L, TiO252.8 g / L, Fe 19.63 g / L, H + 12.4N, return to step ① to prepare acid. Feed liquid 2. through (3b) step adopts same extraction agent after single-stage extraction by the volume rat...

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Abstract

The invention relates to a method for extracting scandium oxide from tungsten steel slag. The method includes the steps: firstly, using a fine ball mill to crush the steel slag prior to performing main processes of inorganic acid leaching, organic solvent extraction, oxalate precipitation and the like, and enabling scandium in the tungsten steel slag to leach by the aid of sulfuric acid; secondly, allowing leaching liquor to stand to precipitate titanyl sulfate, filtering and removing titanyl sulfate, diluting mother liquor by slag washing water, and using the diluted mother liquor as feed liquor 1 of the extracted scandium; thirdly, dissolving the filtered titanyl sulfate solids by the slag washing water, and using filtrate with insoluble impurities as feed liquor 2 of the extracted scandium; fourthly, extracting the feed liquor 1 and the feed liquor 2, performing back extraction for a loaded organic phase by NaoH solution, and using sulfuric acid to dissolve hydroxide obtained after back extraction; fifthly, removing titanium by water, subjecting scandium-rich liquor with the titanium removed to secondary extraction according to conditions, washing the loaded organic phase by sulfuric acid solution containing Nacl and H2O2, then using NaoH solution for back extraction, and performing filtering, ignition and hydrochloric acid dissolving for scandium hydroxide obtained after back extraction; and finally, precipitating scandium oxalate from oxalate, and then converting the scandium oxalate to the scandium oxide by means of ignition.

Description

technical field [0001] The invention relates to a method for recovering scandium from a mixture containing scandium, titanium, zirconium, etc. by sulfuric acid leaching, organic solvent extraction and oxalic acid precipitation, especially a method for separating and recovering scandium from tungsten steel slag. Background technique [0002] At present, the ways to recover scandium from ilmenite and its products include: recovery from the hydrolysis mother liquor of titanium dioxide production and recovery from the chlorination fume of Ticl4 production, while the recovery of Sc2O3 from tungsten steel slag has not been reported in China. The existing technology for extracting scandium from titanium white mother liquor has low acidity (6N) and low TiO2 content (about 4 g / L), while the scandium content in tungsten steel slag is about 250 g / ton After leaching with sulfuric acid, the TiO2 content in the acid leaching solution is as high as 50-80 g / L, and the acidity is above 18N. ...

Claims

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Application Information

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IPC IPC(8): C22B7/04C22B3/08C22B3/20C22B3/22C22B3/38C22B3/44C22B59/00
CPCY02P10/20
Inventor 龙颖
Owner 龙颖
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