A method for step-by-step extraction of vanadium chromium and removal of aluminum and silicon from alkaline aqueous solution

An alkaline aqueous solution and aqueous solution technology, applied in the field of hydrometallurgy, 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: 2018-07-17
INST OF PROCESS ENG CHINESE ACAD OF SCI
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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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  • A method for step-by-step extraction of vanadium chromium and removal of aluminum and silicon from alkaline aqueous solution

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Experimental program
Comparison scheme
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 step-by-step extraction of vanadium chromium and removal of aluminum silicon from an alkaline aqueous solution. Aqueous solution; the alkylamine extractant is mixed with an organic diluent to obtain a mixed organic solution; the mixed aqueous solution is mixed with a mixed organic solution for extraction to obtain a system in which two layers of liquid coexist, the upper layer is an organic phase containing vanadium and aluminum, and the lower layer is Aqueous phase containing chromium and silicon; the organic phase containing vanadium and aluminum is back-extracted twice to obtain aqueous phase containing vanadium, aqueous phase containing aluminum and the first upper organic phase respectively; the aqueous phase containing chromium and silicon is mixed with the first upper organic phase performing extraction to obtain a chromium-containing organic phase and a silicon-containing aqueous phase; mixing the chromium-containing organic phase with a stripping agent for stripping to obtain a chromium-containing aqueous phase and a second upper organic phase. The invention can effectively extract vanadium and chromium step by step and remove aluminum and silicon from the concentrated alkaline aqueous solution, and the process flow is short and the process 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 & AuthorityPatents(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