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Method for purifying and regenerating inactivated molten salt by electrochemical method and recovering valuable metals in it
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A valuable metal, chemical technology, applied in electrodes, electrolysis components, electrolysis process, etc., can solve problems such as molten salt inactivation
Active Publication Date: 2021-04-20
NORTHEASTERN UNIV LIAONING
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[0005] Aiming at the recovery of Mg in the process of titanium-containing blast furnace slag molten salt chlorination recovery and extraction of Ti in the prior art 2+ , Ca 2+ To solve the problem of deactivation of molten salt by enrichment of ions in molten salt, the present invention proposes a method for electrochemically purifying and regenerating inactivated molten salt and recovering valuable metals in it. Collect metal ions, realize the purification and regeneration of molten salt, and recover the valuable metals in it at the same time, which ensures the repeated use of resources, reduces pollution, reduces costs, and improves the comprehensive utilization value of molten salt
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Embodiment 1
[0032] A method for electrochemically purifying and regenerating inactivated molten salt and recovering valuable metals therein, comprising the following steps:
[0033] In this embodiment, the source of inactivated molten salt is: titanium-containing blast furnace slag is subjected to molten salt chlorination process;
[0034] Take inactivated molten salt 1000g, after analyzing its composition is each component and the quality of each component is: NaCl319.92g, KCl413.18g, CaCl 2 155.73g, MgCl 2 117.17 g.
[0035] Graphite is used as the anode, stainless steel is used as the cathode, and the inactivated molten salt obtained through molten salt chlorination is used as the electrolyte to conduct constant cell piezoelectric electrolysis for magnesium precipitation. The electrolysis atmosphere is an inert atmosphere, the electrolysis voltage is 2.6V, and the electrolysis time is 6h. , after the electrolysis, lift the stainless steel cathode deposited with Mg above the molten ...
Embodiment 2
[0040] A method for electrochemically purifying and regenerating inactivated molten salt and recovering valuable metals therein, comprising the following steps:
[0041] In this embodiment, the source of the inactivated molten salt is: titanium-containing blast furnace slag is subjected to molten salt chlorination process:
[0042] Step I: Press CaCl 2 :NaCl:KCl=0.515:0.405:0.080 molar ratio prepares 700g of mixed salt, its eutectic temperature point is 483°C, puts the prepared mixed salt into a stainless steel reactor, and heats up at a heating rate of 5°C / min to the eutectic temperature until the mixed salt melts completely;
[0043] Step II: Mix the titanium-containing blast furnace slag with a certain amount of carbon (1 to 1.3 times the theoretical amount) evenly and send it into the mixed molten salt, and blow chlorine gas into the molten salt system at a flow rate of 0.1 to 0.3m / s, the volume concentration of chlorine gas is 20-80%, the chlorination time is 0.5-2h, a...
Embodiment 3
[0051] A method for electrochemically purifying and regenerating inactivated molten salts and recovering valuable metals therein, the same as in Example 1, the difference is that the electrolysis voltage in the electrolytic magnesium precipitation process is 2.8V, and the rest are the same, wherein the recovery rate of magnesium Reached 87%, the recovery rate of calcium reached 75%.
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Abstract
The invention relates to a method for electrochemically purifying and regenerating inactivated molten salt and recovering valuable metals therein, belonging to the field of molten salt electrochemistry. In this method, graphite is used as the anode, a metal that is difficult to alloy with Mg is used as the cathode, an inactivated molten salt is used as the electrolyte, Mg is electrochemically deposited, and then a low melting point liquid metal is used as the cathode, which changes the reduction of the original cations in the electrolyte. Sequence, and then electrolytically remove calcium, thus realizing the step-by-step electrolysis to extract and enrich metal ions from the inactivated molten salt, which purifies and regenerates the molten salt, and recovers the valuable metals in it at the same time, ensuring the repeated use of resources and reducing Pollution is reduced, costs are reduced, and the comprehensive utilization value of molten salt is improved.
Description
technical field [0001] The invention belongs to the field of molten salt electrochemistry and also belongs to the field of resource recovery. Specifically, it relates to a method for purifying and regenerating inactivated molten salt by electrochemical method and recovering valuable metals therein. Background technique [0002] my country's vanadium-titanium magnetite resource reserves are abundant, accounting for about 33% of the world's vanadium-titanium magnetite resource reserves. Vanadium-titanium magnetite is an excellent iron ore and vanadium ore resource, and contains a large amount of titanium. Whether it is the traditional blast furnace ironmaking or the "pre-reduction-electric furnace smelting method" proposed in recent years, only the iron and vanadium in the mineral can be reduced to obtain metal recycling, and it is inevitable that a large amount of titanium will enter the slag phase and form a mineral Titanium-containing blast furnace slag with complex compo...
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