Preparation method of metal gallium

Abstract

The invention discloses a preparation method of metal gallium. The preparation method comprises the following steps: S1, preparing a gallium material: obtaining the gallium material from germanium confining residual liquid; s2, leaching: adding a dilute sulfuric acid solution into the gallium material for leaching; s3, pressure filtration: performing pressure filtration on the leached gallium material to obtain a gallium solution; s4, impurity removal: adding a sodium carbonate solution into the gallium solution to remove impurities, and enriching to obtain slag; s5, electrolysis: putting the gallium material rich in the slag into an electrolytic bath, and electrifying direct current for electrolytic reduction to separate out metal gallium; s6, impurity separation: adding water into the metal gallium obtained by electrolysis for washing, and then putting the metal gallium into a large glass funnel for impurity separation; and S7, obtaining a gallium finished product. The concentration of the dilute sulfuric acid solution in the step S2 is 5%. The pressure intensity in the step S3 is 0.6 to 1.0 MPa. The concentration of the sodium carbonate solution in the step S4 is 15%. The water in the step S6 is purified water, and the large glass funnel is made of high borosilicate glass. The process saves the cost, and the purity of the gallium finished product is extremely high.

Description

Technical Field

[0001] This invention relates to the field of high-purity semiconductor metal materials, specifically a method for preparing metallic gallium. Background Technology

[0002] Gallium can be recovered using two methods: amalgamation and extraction. However, mercury in the amalgamation method is highly toxic and poses a significant threat to the environment and human health, and its use has been banned in most countries. Therefore, extraction is the preferred method for gallium recovery.

[0003] Germanium materials contain gallium. The process involves first recovering metallic indium, then metallic gallium, and finally metallic germanium. During the recovery process, the metallic gallium is enriched in the circulating mother liquor through saponification extraction. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method for preparing metallic gallium, which not only saves costs but also produces gallium products with extremely high purity.

[0005] To solve the above-mentioned technical problems, the technical solution of the present invention is: a method for preparing metallic gallium, comprising the following steps:

[0006] S1, Gallium material: Gallium material is obtained from residual germanium solution;

[0007] S2. Immersion: Immerse the gallium material in a dilute sulfuric acid solution;

[0008] S3. Pressure filtration: The leached gallium material is filtered under pressure to obtain a gallium solution;

[0009] S4. Impurity Removal: Add sodium carbonate solution to gallium solution to remove impurities and enrich it into slag;

[0010] S5. Electrolysis: Gallium material enriched with slag is placed in an electrolytic cell and electrolyzed and reduced by direct current to precipitate metallic gallium.

[0011] S6. Separate impurities: Wash the electrolytically obtained gallium metal with water, and then put it into a large glass funnel to separate impurities.

[0012] S7. Obtain gallium product.

[0013] The concentration of the dilute sulfuric acid solution in S2 is 5%.

[0014] The pressure in S3 is 0.6-1.0 MPa.

[0015] The sodium carbonate solution in S4 has a concentration of 15%.

[0016] The water in S6 is pure water, and its large glass funnel is made of high borosilicate glass.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0018] 1. Save costs and reduce extraction time;

[0019] 2. The purity of the finished product reaches 99.99%. Attached Figure Description

[0020] Figure 1 This is a flowchart of the present invention. Detailed Implementation

[0021] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings. It should be noted that these descriptions are for the purpose of aiding understanding the present invention, but do not constitute a limitation thereof. Furthermore, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0022] The present invention provides a method for preparing metallic gallium, comprising the following steps:

[0023] S1, Gallium material: Gallium material is obtained from residual germanium solution;

[0024] S2. Immersion: Immerse the gallium material in a dilute sulfuric acid solution;

[0025] S3. Pressure filtration: The leached gallium material is filtered under pressure to obtain a gallium solution;

[0026] S4. Impurity Removal: Add sodium carbonate solution to gallium solution to remove impurities and enrich it into slag;

[0027] S5. Electrolysis: Gallium material enriched with slag is placed in an electrolytic cell and electrolyzed and reduced by direct current to precipitate metallic gallium.

[0028] S6. Separate impurities: Wash the electrolytically obtained gallium metal with water, and then put it into a large glass funnel to separate impurities.

[0029] S7. Obtain gallium product.

[0030] The concentration of the dilute sulfuric acid solution in S2 is 5%.

[0031] The pressure in S3 is 0.6-1.0 MPa.

[0032] The sodium carbonate solution in S4 has a concentration of 15%.

[0033] The water in S6 is pure water, and its large glass funnel is made of high borosilicate glass.

[0034] In this invention

[0035] Gallium is extracted by saponification, and the reaction formula is as follows:

[0036]

[0037] Gallium material is leached using a 5% dilute sulfuric acid solution as the stripping agent; the reaction formula is 2Ga + 3H₂SO₄ = Ga₂(SO₄)₃ + 3H₂↑.

[0038] The leached gallium solution was filtered under pressure, and then impurities were removed with a 15% sodium carbonate solution. The impurity removal reaction formula is as follows:

[0039] Ga2(SO4)3+3Na2CO3+3HO=2Ga(OH)2↓+3Na2SO4+3CO2↑,

[0040] After it becomes slag, it is electrolyzed. The electrolysis reaction is as follows:

[0041]

[0042] Gallium metal can be obtained by electrolysis;

[0043] At this point, the purity of the gallium metal is low. After washing the gallium metal with pure water, the impurities are separated using a large glass funnel to obtain a gallium metal product that resembles mercury, with a purity of up to 99.99%.

[0044] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations still fall within the protection scope of the present invention.

Claims

1. A method for preparing metallic gallium, characterized in that, Includes the following steps: S1, Gallium material: Gallium material is obtained from residual germanium solution; S2. Immersion: Immerse the gallium material in a dilute sulfuric acid solution; S3. Pressure filtration: The leached gallium material is filtered under pressure to obtain a gallium solution; S4. Impurity Removal: Add sodium carbonate solution to gallium solution to remove impurities and enrich it into slag; S5. Electrolysis: Gallium material enriched with slag is placed in an electrolytic cell and electrolyzed and reduced by direct current to precipitate metallic gallium. S6. Separating impurities: Wash the electrolytically obtained metallic gallium with water, and then place it in a large glass funnel to separate impurities, thus obtaining the finished gallium product; S7. Obtain gallium product.

2. The method for preparing metallic gallium according to claim 1, characterized in that, The concentration of the dilute sulfuric acid solution in S2 is 5%.

3. The method for preparing metallic gallium according to claim 1, characterized in that, The pressure in S3 is 0.6-1.0 MPa.

4. The method for preparing metallic gallium according to claim 1, characterized in that, The sodium carbonate solution in S4 has a concentration of 15%.

5. The method for preparing metallic gallium according to claim 1, characterized in that, The water in S6 is pure water, and its large glass funnel is made of high borosilicate glass.

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