A method for extracting scandium from scandium-rich slag obtained by pretreatment of red mud
A pretreatment and red mud technology, which is applied in the direction of improving process efficiency, can solve problems such as emulsification, and achieve the effects of inhibiting extraction, high extraction rate, and improving purity
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Embodiment 1
[0034] After red mud is successively subjected to sodium salt reduction roasting-magnetic separation, phosphoric acid leaching, and sodium hydroxide alkali leaching, red mud rich scandium slag (obtained by the method of patent CN105331837A) is obtained, and its composition is shown in Table 1. Compared with the raw red mud ore without any treatment, it can be seen that after the above pretreatment, the scandium content of red mud is well enriched, and its content is increased by nearly 4.5 times, and the recovery rate is as high as 87%. The impurity elements such as iron, aluminum, silicon, etc., which have a great influence on the extraction process, have been effectively removed. The main components in scandium slag are calcium and titanium, whose contents are as high as 25.73% and 28.15%, respectively. Therefore, the key to the subsequent extraction of scandium is to effectively separate scandium from impurities such as calcium and titanium.
[0035] The chemical compositi...
Embodiment 2
[0039] The red mud scandium-rich slag in Example 1 was subjected to normal pressure acid leaching, and different acid leaching agents were used for leaching. Other conditions were controlled to be the same, the liquid-solid ratio was 15:1 mL / g, the leaching temperature was 40 ° C, the leaching time was 60 min, and the stirring Speed 350r / min; after leaching, filter immediately.
[0040] Table 2 acid leaching test results (wt%) (2mol / L)
[0041]
[0042] Table 3 acid leaching test results (wt%) (8mol / L)
[0043]
[0044]It can be seen from the above table that under the action of different acid leaching agents, the leaching rate of scandium has little difference, but other components such as iron, aluminum, silicon, calcium, titanium, etc. have obvious behavior differences. In the leaching of sulfuric acid and nitric acid, the filtration performance of the solution is poor, but under the action of hydrochloric acid and phosphoric acid, the filtration performance of the...
Embodiment 3
[0052] Carry out solvent extraction to the scandium-containing acid leaching solution after the above-mentioned red mud rich scandium residue acid leaching filtration, adopt the P20 of 2% volume (kerosene is a thinner) as extraction agent, and the volume ratio of aqueous phase and organic phase is 3:1, Phosphoric acid was used to control the pH of the aqueous phase to 1.6-1.8, shake for 15 minutes and then stand, and separate the organic phase and the aqueous phase after layering. Analyze the concentration of each component in the organic phase, calculate the extraction rate (η) of scandium, and the separation coefficient (β) of scandium and other impurity components.
[0053] It can be seen from Table 5 that in the phosphoric acid medium, the extraction rate of scandium can reach 98.6%, and the separation coefficients of scandium and iron, aluminum and calcium are 2592.7, 230.0 and 27.3, respectively, indicating that in the phosphoric acid medium, it is beneficial to realize t...
PUM
Login to View More Abstract
Description
Claims
Application Information
Login to View More