Clean process method for efficiently extracting chromium in extracted vanadium tailings

A technology for extracting vanadium tailings and process methods, applied in the direction of improving process efficiency, etc., can solve problems such as complex processes, and achieve the effect of short process and high resource utilization rate

Active Publication Date: 2014-12-10
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Abstract
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Problems solved by technology

However, this method requires two steps of liquid-solid separation to obtain hydrated calcium silicate, which needs to be reprocessed and the process is complicated

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  • Clean process method for efficiently extracting chromium in extracted vanadium tailings

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Embodiment approach

[0053] In order to better illustrate the present invention and facilitate understanding of the technical solution of the present invention, the present invention will be further described in detail below. However, the following embodiments are only simple examples of the present invention, and do not represent or limit the protection scope of the present invention, and the protection scope of the present invention shall be determined by the claims. Embodiments of the present invention are as follows:

[0054] A cleaning process for extracting chromium in vanadium extraction tailings, comprising the following steps:

[0055] (1) Mix the ball milled or crushed vanadium extraction tailings with 10-20wt% sodium hydroxide solution so that the mass volume ratio of the vanadium extraction tails and sodium hydroxide solution is 1:8-1:20g / mL and heat to 90- At 150°C, add a silicon fixative at the same time and react for 0.5-4 hours to solidify silicon. After liquid-solid separation, an ...

Embodiment 1

[0063] In this embodiment, the vanadium extraction tailings are used, containing Cr1.35wt%, Si7.03wt%, TFe26.30wt%.

[0064] (1) 50g of vanadium extraction tailings are ball milled, then mixed with 10wt% sodium hydroxide solution, the mass volume ratio of slag to alkali is 1:20, and heated to 90°C; 2 The molar ratio is 0.7:1 to take quicklime, and according to the mass ratio of quicklime (calculated as CaO) and water as 1:4, add water and stir to make milk of lime, add milk of lime to the solution and stir for 4 hours to react, and carry out liquid-solid separation. Obtain sodium hydroxide-containing immersion solution and desiliconization slag; return the sodium hydroxide-containing immersion solution to prepare sodium hydroxide solution;

[0065] (2) prepare 30wt% sodium hydroxide solution, add it and the desiliconization slag in the step (1) to the reactor and mix, the slag-alkali mass ratio is 1:20, heat to 300 ° C, use oxygen as oxidant, liquid Alkaline leaching of chrom...

Embodiment 2

[0071] In this embodiment, the vanadium extraction tailings are used, containing 5.34wt% Cr, 12.74wt% Si, and 18.49wt% TFe.

[0072] (1) 50g of vanadium extraction tailings are ball milled, then mixed with 12wt% sodium hydroxide solution, the mass ratio of slag to alkali is 1:18, and heated to 100°C; 2 The molar ratio is 0.9:1 to take unslaked lime, and according to the mass ratio of unslaked lime (calculated as CaO) and water is 1:4.5, add water and stir to make milk of lime, add milk of lime to the solution and stir for 3h, carry out liquid-solid separation, Obtain sodium hydroxide-containing immersion solution and desiliconization slag; return the sodium hydroxide-containing immersion solution to prepare sodium hydroxide solution;

[0073] (2) prepare 40wt% sodium hydroxide solution, add it and the desiliconization slag in the step (1) to the reactor and mix, the slag-alkali mass ratio is 1:18, heat to 280 ° C, use oxygen as oxidant, liquid Alkaline leaching of chromium, r...

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Abstract

The invention discloses a clean process method for efficiently extracting chromium in extracted vanadium tailings. For the extracted vanadium tailings, a silicon fixing agent is added while silicon is leached with low-concentration sodium hydroxide; the silicon is converted into an inert compound in the alkaline leaching and chromium extracting process; the inert compound is subjected to alkaline leaching and chromium extracting to obtain sodium chromate alkali solution with lower silicon content and iron-enriched tailings, so that high-efficiency extraction of the chromium in the extracted vanadium tailings and comprehensive utilization of valuable components are realized. According to the clean process method disclosed by the invention, the high-efficiency extraction of the chromium in the extracted vanadium tailings can be realized, the extraction rate of the chromium is larger than 85 percent, and the content of the silicon in the obtained sodium chromate alkali solution is lower.

Description

technical field [0001] The invention belongs to the technical field of hydrometallurgy and chromium chemical industry, in particular, the invention relates to a cleaning process for efficiently extracting chromium from vanadium extraction tailings. Background technique [0002] Vanadium and chromium are important strategic resources of the country, and the positions of vanadium and chromium products in the national economy are irreplaceable. Vanadium-containing minerals (such as vanadium-titanium magnetite) are smelted into molten iron, and the vanadium slag with high vanadium content obtained by oxidation blowing is the main raw material for extracting vanadium in my country at present. The composition of vanadium slag produced by blowing of different vanadium-containing minerals is quite different, but they all contain valuable metal components such as chromium and iron together with vanadium, which has high resource utilization value. After the vanadium in the vanadium s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/04C22B34/32
CPCY02P10/20
Inventor 徐红彬田颖张红玲段少勇裴丽丽付云枫余开平张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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