Method for extracting vanadium and chromium step by step and removing aluminum and silicon from alkaline aqueous solution

An alkaline aqueous solution containing vanadium-chromium-aluminum-silicon technology, which is applied in the direction of improving process efficiency and can solve the problems of poor separation performance of vanadium-chromium and silicon-aluminum, low precipitation rate of vanadium and chromium, etc.

Inactive Publication Date: 2016-05-25
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Description
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Problems solved by technology

[0009] Aiming at the problems of low precipitation rate of vanadium and chromium in concentrated alkaline aqueous solution and poor separation performance of vanadium-chromium and silicon-aluminum existing in the prior art, the present invention provides a stepwise extraction of vanadium-chromium and removal of aluminum from concentrated alkaline aqueous solution. silicon method

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  • Method for extracting vanadium and chromium step by step and removing aluminum and silicon from alkaline aqueous solution

Examples

Experimental program
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Effect test

Embodiment 1

[0062] (1) In 20mL of concentrated alkaline aqueous solution containing vanadium-chromium-aluminum-silicon (wherein, the concentration of vanadium-chromium-aluminum-silicon is 5mmol / L, and the mass percent of sodium hydroxide is 0.05%), add 0.001g of sodium tartrate to obtain a mixed aqueous solution .

[0063] (2) Mix the extractant trioctylmethylammonium chloride and the organic diluent n-heptane according to the volume ratio of 1:2 to obtain a mixed organic solution.

[0064] (3) The mixed organic solution obtained in step (2) and the mixed aqueous solution obtained in step (1) are mixed at room temperature according to a volume ratio of 1:50 for extraction, fully mixed and left to stand to obtain a system in which the upper and lower layers of liquid coexist, The upper layer is an organic phase containing vanadium and aluminum, and the lower layer is an aqueous phase containing chromium and silicon.

[0065] (4) Mix the upper vanadium-aluminum organic phase obtained in st...

Embodiment 2

[0070] (1) Add 0.3 g of sodium tartrate to 20 mL of concentrated alkaline aqueous solution containing vanadium-chromium-aluminum-silicon (wherein the concentration of vanadium-chromium-aluminum-silicon is 5 mmol / L and the mass percent of sodium carbonate is 5%) to obtain a mixed aqueous solution.

[0071] (2) Mix the extractant trioctylmethylammonium chloride with the organic diluent kerosene at a volume ratio of 1:10 to obtain a mixed organic solution.

[0072] (3) The mixed organic solution obtained in step (2) and the mixed aqueous solution obtained in step (1) are mixed at room temperature according to a volume ratio of 1:5 for extraction, fully mixed and left to stand to obtain a system in which the upper and lower layers of liquid coexist, The upper layer is an organic phase containing vanadium and aluminum, and the lower layer is an aqueous phase containing chromium and silicon.

[0073] (4) Mix the upper vanadium-aluminum organic phase obtained in step (3) with the sod...

Embodiment 3

[0078] (1) In 20mL of concentrated alkaline aqueous solution containing vanadium-chromium-aluminum-silicon (wherein, the concentration of vanadium-chromium-aluminum-silicon is 5mmol / L, and the mass percent of sodium bicarbonate is 0.4%), add 0.001g of sodium citrate to obtain mixed aqueous solution.

[0079] (2) Mix the extractant secondary carboprimary amine with the organic diluent kerosene at a volume ratio of 1:10 to obtain a mixed organic solution.

[0080] (3) The mixed organic solution obtained in step (2) and the mixed aqueous solution obtained in step (1) are mixed at room temperature according to a volume ratio of 1:25 for extraction, fully mixed and left to stand to obtain a system in which the upper and lower layers of liquid coexist, The upper layer is an organic phase containing vanadium and aluminum, and the lower layer is an aqueous phase containing chromium and silicon.

[0081] (4) The upper vanadium-aluminum organic phase obtained in step (3) is mixed with ...

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Abstract

The invention provides a method for extracting vanadium and chromium step by step and removing aluminum and silicon from an alkaline aqueous solution. The method comprises steps as follows: organic carboxylate is added to the alkaline aqueous solution containing vanadium, chromium, aluminum and silicon, and a mixed aqueous solution is obtained; an alkylamine extraction agent and an organic diluent are mixed, and a mixed organic solution is obtained; the mixed aqueous solution and the mixed organic solution are mixed for extraction, a system with upper and lower layers of liquids coexisting is obtained, the upper layer is an organic phase containing the vanadium and the aluminum, and the lower layer is an aqueous phase containing the chromium and the silicon; reverse extraction treatment is performed on the organic phase containing the vanadium and the aluminum twice, and an aqueous phase containing the vanadium, an aqueous phase containing the aluminum and a first upper-layer organic phase are obtained; the aqueous phase containing the chromium and the silicon and the first upper-layer organic phase are mixed for extraction, and an organic phase containing the chromium and an aqueous phase containing the silicon are obtained; the organic phase containing the chromium and a reverse extraction agent are mixed for reverse extraction, and an aqueous phase containing the chromium and a second upper-layer organic phase are obtained. With the adoption of the method, the vanadium and the chromium can be effectively extracted from the alkaline aqueous solution step by step, the aluminum and the silicon can be effectively removed from the alkaline aqueous solution, the technological process is short, and the technological cost is low.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, and relates to a method for extracting vanadium chromium step by step from an alkaline aqueous solution and removing aluminum silicon, in particular to a method for stepwise extracting vanadium chromium and removing aluminum silicon from a concentrated alkaline aqueous solution method. Background technique [0002] my country's Sichuan Panzhihua area has extremely rich vanadium-titanium magnetite resources, which have great development and application prospects. Over the years, in order to realize the comprehensive extraction and utilization of valuable metals such as vanadium, chromium, and titanium in vanadium-titanium magnetite, people have done a lot of work in related hydrometallurgy processes. When acidic leaching is used for this multi-metal symbiotic complex mineral, most of the metals will enter the solution; while alkaline leaching can achieve the initial separation of vanadium, chromium...

Claims

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Application Information

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Patent Type & AuthorityApplications(China)
IPC IPC(8): C22B34/22C22B34/32C22B3/28
CPCC22B34/22C22B34/32C22B3/28Y02P10/20
Inventor黄焜孙盼刘会洲
OwnerINST OF PROCESS ENG CHINESE ACAD OF SCI