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A method for efficient extraction, separation and recovery of chromium and silicon in vanadium extraction tailings

A technology of vanadium tailings extraction, separation and recovery, which is applied in the direction of silicate, alkaline earth metal silicate, chromate/dichromate, etc., to achieve the effects of low production cost, low silicon content and high resource utilization rate

Active Publication Date: 2016-05-18
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

CN102627328A discloses a method for improving the conversion rate of calcium-free roasting chromium. In the process of the method, the amount of slag added is reduced, but additives (chromic anhydride or manganese ore) are added, which does not fundamentally solve the problem

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  • A method for efficient extraction, separation and recovery of chromium and silicon in vanadium extraction tailings

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Embodiment approach

[0045] 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:

[0046] A process for extracting, separating and recovering chromium and silicon in vanadium extraction tailings, comprising the following steps:

[0047] (1) The vanadium extraction tailings after ball milling or crushing and 10-20wt% sodium hydroxide solution are mixed and heated according to the mass volume ratio of the vanadium extraction tailings and sodium hydroxide solution to 90~150℃, carry out pre-desiliconization reaction for 0.5~4h, and obtain desiliconization slag an...

Embodiment 1

[0054] In this embodiment, the vanadium extraction tailings are used, containing 5.34wt% Cr, 12.74wt% Si, and 18.49wt% TFe.

[0055] (1) 50g of vanadium extraction tailings are carried out by ball milling;

[0056] (2) Prepare 10wt% sodium hydroxide solution, mix the sodium hydroxide solution with vanadium extraction tailings in a reactor, the mass volume ratio of slag to alkali is 1:20, pre-desilicate at 150°C for 4 hours. After liquid-solid separation, desiliconization slag and silicon-containing solution are obtained;

[0057] (3) Take quicklime according to the molar ratio of Ca and Si in the silicon-containing solution of 0.8:1, and add water and stir according to the mass ratio of quicklime (calculated as CaO) and water as 1:4 to obtain milk of lime, and add the milk of lime to the solution containing In the silicon solution, solidify the silicon at 150°C for 4 hours, and then separate the liquid and solid to obtain the aqueous calcium silicate and sodium hydroxide solu...

Embodiment 2

[0061] In this embodiment, the vanadium extraction tailings are used, containing Cr1.35wt%, Si7.03wt%, TFe26.30wt%.

[0062] (1) 50g of vanadium extraction tailings are carried out by ball milling;

[0063] (2) Prepare 12wt% sodium hydroxide solution, mix the sodium hydroxide solution with vanadium extraction tailings in a reactor, the mass volume ratio of slag to alkali is 1:18, and pre-desilicate at 140°C for 3 hours. After liquid-solid separation, desiliconization slag and silicon-containing solution are obtained;

[0064] (3) Take quicklime according to the molar ratio of Ca and Si in the silicon-containing solution of 0.9:1, and add water and stir according to the mass ratio of quicklime (calculated as CaO) and water as 1:4.5 to prepare milk of lime, and add the milk of lime to the solution containing In the silicon solution, solidify silicon at 130°C for 3 hours, and then separate the liquid and solid to obtain hydrous calcium silicate and sodium hydroxide solution. Aft...

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Abstract

The invention relates to a process method for efficiently extracting, separating and recovering chromium and silicon from vanadium extraction tailings. The process method comprises the following steps: firstly leaching the vanadium extraction tailings with low-concentration sodium hydroxide to obtain a silicon-containing solution and tailings after silicon removal, adding a silicon fixing agent into the silicon-containing solution to convert silicon to a calcium silicate primary product, and performing treatment on the tailings after silicon removal by a baking method to obtain a sodium chromate alkaline solution with relatively low silicon content and iron-rich tailings, thereby realizing efficient extraction, separation and recovery of chromium and silicon from the vanadium extraction tailings. By adopting the process method provided by the invention, the efficient extraction, separation and recovery of chromium and silicon from the vanadium extraction tailings can be realized, the recovery rate of chromium is more than 85%, the recovery rate of silicon is more than 95%, and the silicon content in the obtained sodium chromate alkaline solution is relatively low.

Description

technical field [0001] The invention belongs to the technical field of metallurgy and chromium chemical industry, in particular, the invention relates to a method for separating and recycling chromium and silicon 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 sl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G37/14C01B33/24
Inventor 徐红彬田颖张红玲段少勇裴丽丽余开平付云枫张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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