Sponge bismuth powder displacement and deposition method under action of micro-currents

A bismuth sponge and micro-current technology, which is applied in the field of hydrometallurgy, can solve the problems of accelerating the replacement process and low-grade bismuth powder, and achieve the effects of promoting the replacement process, promoting pitting corrosion, and increasing the replacement specific surface area

Active Publication Date: 2013-12-04
CENT SOUTH UNIV
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  • Claims
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for displacing and depositing sponge bismuth powder under the action of a micro-current in view of the deficiencies in the existing technology. Under the action of current, the replacement process is greatly accelerated, and the replacement efficiency is greatly improved.

Method used

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  • Sponge bismuth powder displacement and deposition method under action of micro-currents

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1. Using the purification solution after bismuth leaching in a factory as raw material, its chemical composition (g / L) is: Bi 3+ 10.5, Sb 3+ 1.5, Pb 2+ 0.1, Cu 2+ 0.6,As 3+ 0.1, Ag + 0.02; pH=0.2; take 150mL of the material solution and place it in a 300mL reaction tank. The iron plate is 30mm long, 5mm wide, and 1mm thick; the graphite plate is 30mm long, 2.5mm wide, and 2mm thick. rust.

[0034] 2. Put the reaction tank into a 20°C water bath, connect the iron plate to the positive pole of the DC power supply, and connect the graphite plate to the negative pole of the DC power supply.

[0035] 3. Adjust the current density on the iron plate to 0.1×10 -3 A / cm 2 , the distance between the iron plate and the graphite plate is 1cm, the potential difference between the iron plate and the graphite plate is 0.2v, the magnetic stirring rate is 120r / min, the replacement time is 0.5h, the replacement rate reaches 90.6%, and the grade of the obtained bismuth powder is 90....

Embodiment 2

[0037] 1. Using the purification solution after bismuth leaching in a factory as raw material, its chemical composition (g / L) is: Bi 3+ 45, Sb 3+ 1.67, Pb 2+ 0.63, Cu 2+ 1.36,As 3+ 0.067, Ag + 0.006; pH=0.8; take 300mL of the stock solution and put it in a 500mL reaction tank to prepare an iron plate with a length of 50mm, a width of 20mm, and a thickness of 2mm;

[0038] 2. Put the reaction tank into a 40°C water bath, connect the iron plate to the positive pole of the DC power supply, and connect the graphite plate to the negative pole of the DC power supply.

[0039] 3. Adjust the current density on the iron plate to 1.0×10 -3 A / cm 2 , the distance between the iron plate and the graphite plate is 2cm, the potential difference between the iron plate and the graphite plate is 0.1v, the magnetic stirring rate is 100r / min, the replacement time is 1h, the replacement rate reaches 95%, and the grade of the obtained bismuth powder is 91.8%. Wherein the content of lead is le...

Embodiment 3

[0041] 1. Using the preliminary purification solution after bismuth leaching in a factory as raw material, its chemical composition (g / L) is: Bi 3+ 59.6, Sb 3+ 8.5, Pb 2+ 3.8, Cu 2+ 3.54, As 3+ 0.5, Ag + 0.05; pH=1.0 Take 4500mL of the stock solution and place it in a 5000mL reaction tank to prepare an iron plate with a length of 180mm, a width of 160mm, and a thickness of 2mm.

[0042] 2. Put the reaction tank into a 60°C water bath, connect the iron plate to the positive pole of the DC power supply, and connect the graphite to the negative pole of the DC power supply.

[0043]3. Adjust the current density on the iron plate to 10×10 -3 A / cm 2 , the distance between the iron plate and the graphite plate is 5cm, the potential difference between the iron plate and the graphite plate is 0.15v, the mechanical stirring rate is 150r / min, the replacement time is 2.5h, the replacement rate reaches 91.4%, and the grade of the obtained bismuth powder is 93.1%. , wherein the conte...

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Abstract

The invention provides a sponge bismuth powder displacement and deposition method under the action of micro-currents, and belongs to the technical field of hydrometallurgy. According to the sponge bismuth powder displacement and deposition method, an iron plate connected with a positive electrode of a power supply and a graphite plate connected with a negative electrode of the power supply are immersed in feed liquid containing bismuth, direct currents are provided for a displacement reaction, and sponge bismuth powder is obtained. Compared with bismuth powder obtained through a traditional iron powder displacement method, the sponge bismuth powder obtained through the sponge bismuth powder displacement and deposition method is high in grade and has few impurities; compared with bismuth powder obtained by displacement only with the iron plate, the direct micro-currents promote the displacement process and accelerate displacement, and therefore the displacement efficiency is improved greatly. The sponge bismuth powder displacement and deposition method under the action of the micro-currents is simple in preparing process, the obtained sponge bismuth powder is high in purity, and industrial production can be implemented conveniently.

Description

technical field [0001] The invention discloses a method for substituting and depositing bismuth sponge powder under the action of microcurrent, which belongs to the technical field of hydrometallurgy. technical background [0002] As a "green metal", bismuth is not only used in the pharmaceutical industry, but also widely used in semiconductors, superconductors, flame retardants, pigments, cosmetics, chemical reagents, electronic ceramics, etc. element trend. The bismuth powder obtained by traditional iron powder replacement is low in grade, contains many impurities, and consumes a lot of iron powder. However, the replacement of sponge bismuth with iron flakes alone has low efficiency and a long replacement cycle. [0003] The study on the replacement of sponge metal under the action of microcurrent has not been reported in the relevant literature. Contents of the invention [0004] The purpose of the present invention is to provide a method for displacing and depositing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25C5/02B22F9/24
Inventor 何静郭瑞蓝明艳张家玮杨建广唐朝波陈永明杨声海鲁君乐王灿
Owner CENT SOUTH UNIV
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