Device for removing impurity elements in gallium through pickling

Abstract

The utility model discloses a device for removing impurity elements in gallium by pickling, which is a reactor with an inverted conical structure, is provided with a gallium feeding port, an acid feeding port and a gallium discharging port, and is characterized in that a constant-temperature protective layer is further arranged on the outer wall of the reactor, a material mixing device is further arranged in the reactor, the material mixing device comprises a stirring mechanism and a multi-edge and multi-surface ball, the multi-edge and multi-surface ball is of a multi-edge and multi-surface structure and comprises an inner layer and an outer layer, an inner base material is potassium, an outer coating layer is a polytetrafluoroethylene or polyurethane or polyvinyl chloride or polycarbonate layer with the thickness of 1-5 mm, and the device remarkably shortens the pickling and impurity removal time, reduces the use amount of a pickling solution, reduces the loss of gallium and improves the impurity removal effect. Therefore, the efficiency is improved, and the cost is reduced. The problems of insufficient mixing and poor impurity removal effect caused by large density difference between a pickling solution and metal gallium in the prior art are solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to gallium purification technical field, concretely relates to a device for removing impurity elements in gallium by pickling. BACKGROUND

[0002] 99.9% of the impurities contained in the crude gallium include Cu, Pb, Tl, Zn, In and the like, according to the fact that the metallic gallium is relatively stable in acid and alkali at normal temperature, and some impurities in gallium can be dissolved in acid and alkali rapidly at normal temperature, and the reaction is more intense if heated, therefore, according to the characteristics of gallium, the oxide film (a large amount of impurities are enriched in the oxide film) and the sponge gallium are removed mechanically first, then a certain concentration of acid is added according to the difference in activity of different elements, so as to remove the impurity metal elements in gallium, but due to the large difference in density between the acid solution and the metallic gallium (the density of liquid gallium is 5.9g / cm 3 , and the density of the pickling solution is about 1.1g / cm 3 ), the stratification is obvious and the mixing is difficult, leading to long stirring and washing time, poor impurity removal effect and large loss of main metal gallium, and how to realize the full mixing of the two, that is, how to design a high-efficiency pickling device, becomes the key to gallium impurity removal and purification. UTILITY MODEL CONTENT

[0003] The utility model aims at providing a device for removing impurity elements in gallium by pickling, solving the problem of insufficient mixing and poor impurity removal effect caused by the large difference in density between the pickling solution and the metallic gallium in the prior art.

[0004] The utility model is realized by the following technical solutions:

[0005] A device for removing impurity elements in gallium by pickling, the device is a reactor with an inverted conical structure, a gallium adding port, an acid adding port and a gallium discharging port are arranged, a constant temperature protective layer is arranged on the outer wall of the reactor, in addition, a mixing device is further arranged in the reactor, the mixing device comprises a stirring mechanism and a multi-ribbed and multi-faceted ball, the multi-ribbed and multi-faceted ball has a double-layer structure of the inside and the outside, the inside base material is gallium, and the outside coating layer is a 1-5mm-thick polytetrafluoroethylene (PTFE) layer, a polyurethane (PU) layer, a polyvinyl chloride (PVC) layer or a polycarbonate (PC) layer, and the polytetrafluoroethylene layer is preferred. The multi-ribbed and multi-faceted ball is arranged in a multi-ribbed and multi-faceted structure to increase the contact surface, the outside coating layer is hydrophobic and helps to prevent gallium from adhering to the surface of the ball, thereby reducing the loss of gallium, in addition, the coating layer can protect the multi-ribbed and multi-faceted ball from being eroded by the acid solution, prolong the service life and improve the stability and repeatability of the pickling process.

[0006] The size of the multi-ribbed and multi-faceted ball is selected according to the volume of the reactor, and the diameter is generally 5-30mm. According to the volume of the reactor, a 1-2L reactor selects a 5-15mm-diameter multi-ribbed and multi-faceted ball, and a 10-20L reactor selects a Φ10-30mm multi-ribbed and multi-faceted ball.

[0007] The inverted conical structure of the reactor is beneficial to mixing and layering of reactants.

[0008] The device significantly shortens the pickling and impurity removal time, reduces the pickling liquid usage, reduces the gallium loss, and improves the impurity removal effect. BRIEF DESCRIPTION OF DRAWINGS

[0009] Fig. 1 is a device structure diagram for removing impurity elements in gallium pickling; wherein, 1, stirring mechanism, 2, multi-edge multi-surface ball, 3, gallium discharge port, 4, constant temperature protective layer.

[0010] Fig. 2 is a multi-edge multi-surface ball structure diagram; wherein, 2.1, internal base, 2.2 coating layer. DETAILED DESCRIPTION

[0011] The following is a further description of the utility model, but not a limitation of the utility model.

[0012] As shown in Figs. 1-2 A device for removing impurity elements in gallium pickling, the device is an inverted conical structure reactor, provided with a gallium adding port, an acid adding port and a gallium discharge port 3, the reactor outer wall is provided with a constant temperature protective layer, in addition, a mixing device is further arranged in the reactor, the mixing device comprises a stirring mechanism 1 and a multi-edge multi-surface ball 2, the multi-edge multi-surface ball 2 has a multi-edge multi-surface inner and outer two-layer structure, the diameter is 5 mm, the internal base 2.1 is made of gallium, and the outer coating layer 2.2 is a 1 mm thick polytetrafluoroethylene layer. The outer coating layer of the multi-edge multi-surface ball is hydrophobic, which helps to prevent gallium from adhering to the surface of the ball, reduces the loss of gallium, in addition, the coating layer can protect the multi-edge multi-surface ball from being eroded by acid liquid, prolongs the service life, and improves the stability and repeatability of the pickling process. The reactor has an inverted conical structure, which is beneficial to mixing and layering of reactants.

[0013] Pickling and impurity removal process: 1L of crude gallium containing 0.3% of impurity Zn is poured into the inverted conical structure reactor, 0.25L of 3.0M sulfuric acid solution is added according to the proportion, and the acid liquid and gallium are fully mixed and reacted at a constant temperature of 40℃ for 150min. After the reaction is completed, the gallium is discharged from the discharge port, the gallium liquid is washed with pure water until it is neutral, and then it is dried and analyzed. The Zn is reduced to 5.5ppm, the gallium content in the acid liquid is 22g / L, and the raw material gallium loss is about 0.1%. The pickling liquid remains in the reactor and can be reused.

Claims

1. A device for removing impurity elements from gallium by acid washing, the device being a reactor of an inverted conical structure, provided with a gallium feeding port, an acid feeding port and a gallium discharging port, characterized in that, The reactor is provided with a constant temperature protective layer, and a mixing device is arranged in the reactor, which comprises a stirring mechanism and a multi-ribbed multi-faceted ball.

2. The apparatus for removing impurity elements in gallium by acid washing according to claim 1, wherein The diameter of the multi-ribbed multi-faceted ball is 5-30 mm.

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