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Method and device for reducing fluoride in aluminum electrolysis process

An electrolysis device and fluoride technology, applied in the field of aluminum electrolysis, can solve the problems of high anode consumption and insufficient energy saving, and achieve the effects of reducing anode consumption, reducing power consumption and increasing interfacial tension

Pending Publication Date: 2021-10-22
NORTHWEST RES INST OF MINING & METALLURGY INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Aiming at the deficiencies of the prior art, the present invention provides a method and device for reducing fluoride in the process of aluminum electrolysis, mainly to solve the problem of the need to add additional chemical reagents during the existing electrolysis, the anode consumption is high, energy saving is not enough, and it cannot satisfy people. question of request

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  • Method and device for reducing fluoride in aluminum electrolysis process

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Embodiment 1

[0031] refer to figure 1 , a method for reducing fluoride in an aluminum electrolysis process, comprising the following steps:

[0032] Step S1: preparing the electrolysis device;

[0033] Step S2: Apply a gradient magnetic field to the upper and lower sides of the electrolytic cell, and the magnetic field lines of the gradient magnetic field pass through the upper surface of the electrolytic cell, the anode, the electrolyte, the cathode and the lower surface of the electrolytic cell in sequence.

[0034] It should be noted that the gradient magnetic field can be generated by an electromagnetic field or a permanent magnet, and its gradient magnetic field is 10-20T / m. The magnetic induction line of the gradient magnetic field is directed from the anode to the cathode, and the gradient magnetic field applied to the electrolytic cell is rectangular, and the The size of the gradient magnetic field is consistent in the horizontal direction of the electrolytic cell. Step S2 further...

Embodiment 2

[0037] refer to figure 1 , a method for reducing fluoride in an aluminum electrolysis process, comprising the following steps:

[0038] The aluminum electrolyte system is prepared by mixing 1.5% to 3.5% of Al2O3, and the rest is Na3AlF6. All raw material components are commercially available products with high purity. Comparative Example 1 Alkaline production of alumina is applied in the optimal electrolyte components for electrolysis, the added components and the molar ratio of NaF to AlF3 are 1.7. Determination of the aluminum electrolyte system prepared in Examples 1 to 3: take a certain amount of aluminum electrolyte to be tested and place it in a platinum crucible, put the crucible into a well-type high-temperature furnace with a very good heat preservation effect, and heat until the electrolyte sample is completely Melt and overheat at a temperature of 10°C to 20°C, then slowly cool down, measure the temperature with a platinum-rhodium thermocouple, and automatically re...

Embodiment 3

[0040] Such as figure 1 As shown, it is an embodiment of the method of the present invention. In this embodiment, the gradient magnetic field is 5T / m and the aluminum electrolyte system is prepared by mixing the components of Al2O3 1.5% to 3.5%, and the rest is Na3AlF6. It is a commercially available product of high purity. The components added and the molar ratio of NaF to AlF3 was 1.7. Finally, the primary crystal temperature was 930°C, and the electrical conductivity was 2.1 / Ω·cm.

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Abstract

The invention relates to the technical field of aluminum electrolysis, and discloses a method for reducing fluorides in the aluminum electrolysis process. The method comprises the following steps that S1, an electrolysis device is prepared; and S2, gradient magnetic fields are applied to the upper and lower surfaces of an electrolytic cell, and magnetic induction lines of the gradient magnetic fields sequentially penetrate through the upper surface of the electrolytic cell, the anode, the electrolyte, the cathode and the lower surface of the electrolytic cell. the invention further provides a device for reducing fluorides in the aluminum electrolysis process, the device comprises the electrolytic bath and a cathode bus, an insulating side wall is arranged at the edge of the electrolytic bath, and a lower magnet and an upper magnet are arranged at the bottom and the top of the electrolytic bath respectively. The gradient magnetic field is added, so that the conductivity of the electrolyte can be improved, the solubility of aluminum can be reduced, the interfacial tension to carbon residues can be increased, the sodium replacement reaction of aluminum in the electrolyte can be inhibited, the current efficiency in the aluminum electrolysis process can be improved, and the addition amount of additives such as magnesium fluoride, calcium fluoride, lithium fluoride and sodium fluoride can be effectively reduced.

Description

technical field [0001] The invention relates to the technical field of aluminum electrolysis, in particular to a method and device for reducing fluoride in the aluminum electrolysis process. Background technique [0002] Fluorine is one of the essential trace elements for animals and human body. It plays a very important role in the formation of human bones and tooth enamel. Humans can absorb fluorine from drinking water, food and the atmosphere. Fluorine pollution can reduce crop production, cause vegetables to wither and die, and cause chronic fluorosis of cattle, livestock, and people. At present, large-scale aluminum factories and sintering of a fluoride-containing iron ore are the most serious environmental pollution. The fluoride emitted by aluminum electrolytic cells has gaseous and There are two forms of solid state, gaseous fluorine is mainly hydrogen fluoride (HF), a small part of which is adsorbed by alumina dust, and solid fluorine is mainly fine particles formed...

Claims

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Application Information

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IPC IPC(8): C25C3/06C25C3/08C25C3/16C25C3/12
CPCC25C3/06C25C3/08C25C3/16C25C3/12
Inventor 朱红后洁琼王丽苑李中建
Owner NORTHWEST RES INST OF MINING & METALLURGY INST