Device for recovering gallium element from sodium aluminate solution

Abstract

A device for recycling gallium from a sodium aluminate solution comprises a vertically-extending filling cylinder, a first four-way valve, a second four-way valve, a neutralizing tank, a precipitation tank and a dissolving tank, the filling cylinder is filled with a plurality of chelating resin particles, a first connector of the first four-way valve is connected to a base and communicated with the filling cylinder, a first connector of the second four-way valve is connected to a top cover, and a second connector of the second four-way valve is connected to a bottom cover and communicated with the top cover. A fourth connector of the second four-way valve supplies materials to the neutralizing tank through a first pipeline, a first liquid inlet is formed in the top of the neutralizing tank and used for being connected with an alkali liquor source, the neutralizing tank supplies materials to the precipitation tank through a second pipeline, and a second liquid inlet is formed in the top of the precipitation tank and used for being connected with an alkali liquor source. The precipitation tank supplies materials to the dissolving tank through a third pipeline, and a third liquid inlet is formed in the top of the dissolving tank and used for being connected with an alkali liquor source. The device is simple in structure and convenient to operate, the gallium element can be recycled at low cost by utilizing a Bayer process matching device, and the utilization value of bauxite is effectively improved.

Description

Technical Field

[0001] The utility model relates to the field of aluminum oxide production, in particular to a device for recovering gallium elements from sodium aluminate solution. Background Art

[0002] When chemical companies use the Bayer process to produce alumina, the bauxite raw materials used contain gallium.

[0003] Since the volume of bauxite used by enterprises is large, the volume of sodium aluminate solution produced by pulping is also large. If the gallium element in it is not fully recovered, it will cause great waste. How to effectively improve the utilization rate of bauxite raw materials and thus increase the revenue and efficiency of enterprises is a problem that technicians in this field need to think about and solve. Summary of the invention

[0004] The utility model aims to provide a device for recovering gallium from sodium aluminate solution in view of the deficiencies of the prior art. The device has a simple structure and is easy to operate. By utilizing the supporting device of the Bayer process, the gallium can be recovered at a low cost, thereby effectively improving the utilization value of bauxite.

[0005] The technical scheme of the present invention is: a device for recovering gallium from a sodium aluminate solution, comprising a vertically extending filling cylinder, a first four-way valve, a second four-way valve, a neutralization tank, a precipitation tank, and a dissolution tank, wherein a plurality of chelating resin particles are filled in the filling cylinder, and the two ends of the filling cylinder are sealed by a top cover and a base respectively, the first interface of the first four-way valve is connected to the base and communicated with the filling cylinder, the second interface of the first four-way valve is used to be connected to a sodium aluminate solution source, the third interface of the first four-way valve is connected to a water source, the fourth interface of the first four-way valve is connected to an acid solution source, and the The first interface is connected to the top cover and is connected to the filling cylinder. The second interface of the second four-way valve is used to feed the evaporation system. The third interface of the second four-way valve is used to feed the red mud washing liquid source. The fourth interface of the second four-way valve feeds the neutralization tank through the first pipeline. The top of the neutralization tank is provided with a first liquid inlet for connecting to an alkali liquid source. The neutralization tank feeds the sedimentation tank through the second pipeline. The top of the sedimentation tank is provided with a second liquid inlet for connecting to an alkali liquid source. The sedimentation tank feeds the dissolution tank through a third pipeline. The top of the dissolution tank is provided with a third liquid inlet for connecting to an alkali liquid source.

[0006] The chelating resin is Hepti gallium resin HPG319.

[0007] The neutralization tank is provided with a first agitator, the precipitation tank is provided with a second agitator, and the dissolution tank is provided with a third agitator.

[0008] An overflow pipe is arranged on the top of the side wall of the precipitation tank to provide overflow liquid to the neutralization tank.

[0009] The upstream end of the third pipeline is arranged at the bottom of the side wall of the sedimentation tank.

[0010] The above technical solution has the following beneficial effects:

[0011] 1. A device for recovering gallium from a sodium aluminate solution comprises a vertically extending filling cylinder, a first four-way valve, a second four-way valve, a neutralization tank, a precipitation tank, and a dissolution tank. The filling cylinder is filled with a plurality of chelate resin particles, which can adsorb gallium ions in the sodium aluminate solution. The chelate resin particles are filled to increase the contact area with the sodium aluminate solution as much as possible, thereby improving the adsorption effect on gallium ions. The two ends of the filling cylinder are sealed by a top cover and a base, respectively, so as to facilitate the filling and maintenance of the chelate resin particles in the filling cylinder. The first interface of the first four-way valve is connected to the base and communicated with the filling cylinder, the second interface of the first four-way valve is used to connect to the sodium aluminate solution source, the third interface of the first four-way valve is connected to the water source, and the fourth interface of the first four-way valve is connected to the acid source, that is, by controlling the connectivity of the first four-way valve, sodium aluminate solution, water, and acid can be added to the filling cylinder through the first four-way valve to meet the process requirements of adsorption, washing, and desorption, and the sodium aluminate solution, water, and acid all enter from the bottom of the filling cylinder and are discharged from the top of the filling cylinder, thereby ensuring the contact effect and efficiency of these liquid phases with the chelating resin filled in the filling cylinder, thereby improving the adsorption, washing, and desorption effects. The first interface of the second four-way valve is connected to the top cover and is connected to the filling cylinder. The second interface of the second four-way valve is used to feed the evaporation system. The third interface of the second four-way valve is used to feed the red mud washing liquid source. The fourth interface of the second four-way valve feeds the neutralization tank through the first pipeline. That is, corresponding to the first four-way valve, when sodium aluminate solution is added to the filling cylinder, the first interface and the second interface of the second four-way valve are connected to provide the evaporation system with sodium aluminate solution for removing gallium ions, which is returned to the refining process for recycling after evaporation and concentration. When water is added to the filling cylinder for washing, the first interface and the third interface of the second four-way valve are connected, and are used as washing liquid for washing red mud to avoid waste of water resources. When acid solution is injected into the filling cylinder for analysis, the first interface and the fourth interface of the second four-way valve are connected to provide acid solution containing gallium ions to the neutralization tank. A first liquid inlet is provided on the top of the neutralization tank for connecting to an alkali liquid source. The neutralization tank supplies the precipitation tank through a second pipeline. A second liquid inlet is provided on the top of the precipitation tank for connecting to an alkali liquid source. The precipitation tank supplies the dissolution tank through a third pipeline. A third liquid inlet is provided on the top of the dissolution tank for connecting to an alkali liquid source. The acid solution containing gallium ions is obtained after neutralization, precipitation and dissolution in sequence to obtain a sodium gallate solution, which can be sold to the outside for electrolysis to obtain gallium metal, thereby improving the utilization value of bauxite.

[0012] 2. A first agitator is provided in the neutralization tank, a second agitator is provided in the precipitation tank, and a third agitator is provided in the dissolution tank, which are used to promote the neutralization effect, the precipitation effect and the dissolution effect respectively.

[0013] 3. An overflow pipe is arranged on the top of the side wall of the precipitation tank to provide overflow liquid to the neutralization tank. The clear liquid on the top of the precipitation tank is mainly alkali liquid, which can overflow to the neutralization tank to neutralize the acid therein and improve the recovery rate of gallium ions.

[0014] 4. The upstream end of the third pipeline is arranged at the bottom of the side wall of the precipitation tank to provide as much gallium hydroxide precipitation as possible to the dissolution tank to improve the recovery rate of gallium ions.

[0015] Further description is given below in conjunction with the accompanying drawings and specific implementation methods. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the utility model.

[0017] In the accompanying drawings, 1 is the first four-way valve, 2 is the second four-way valve, 3 is the filling cylinder, 4 is the neutralization tank, 5 is the sedimentation tank, 6 is the dissolution tank, 7 is the top cover, 8 is the base, 9 is the overflow pipe, 11 is the first pipeline, 12 is the second pipeline, 13 is the third pipeline, a is the first liquid inlet, b is the second liquid inlet, and c is the third liquid inlet. DETAILED DESCRIPTION

[0018] See also Figure 1, is a specific embodiment of a device for recovering gallium from a sodium aluminate solution. The device for recovering gallium from a sodium aluminate solution comprises a vertically extending filling cylinder 3, a first four-way valve 1, a second four-way valve 2, a neutralization tank 4, a precipitation tank 5, and a dissolution tank 6. The filling cylinder 3 is filled with a plurality of chelating resin particles, and the two ends of the filling cylinder 3 are sealed by a top cover 7 and a base 8 respectively. In this embodiment, the chelating resin particles are HPG319 gallium resin. The volume of the filling cylinder is determined by the flow rate of the sodium aluminate solution of the enterprise. The larger the flow rate, the larger the volume of the filling cylinder. Obviously, the top cover and the base are detachable from the filling cylinder, such as by threaded connection, or by flange connection, usually by flange connection. The first interface of the first four-way valve 1 is connected to the base 8 and communicated with the filling cylinder 3. The second interface of the first four-way valve is used to connect to the sodium aluminate solution source. The third interface of the first four-way valve is connected to the water source. The fourth interface of the first four-way valve is connected to the acid source. In this embodiment, the acid is sulfuric acid with a concentration of 8-12wt%, and the sodium aluminate solution is a seed and denominator solution from which aluminum hydroxide crystals are separated. The first interface of the second four-way valve 2 is connected to the top cover 7 and communicated with the filling cylinder 3. The second interface of the second four-way valve is used to feed the evaporation system. The third interface of the second four-way valve is used to feed the red mud washing liquid source. The fourth interface of the second four-way valve is used to feed the neutralization tank 4 through the first pipeline 11. A first liquid inlet a is provided on the top of the neutralization tank 4 for connecting to an alkali solution source. The neutralization tank 4 supplies the precipitation tank 5 through a second pipeline 12. A second liquid inlet b is provided on the top of the precipitation tank 5 for connecting to an alkali solution source. The precipitation tank 5 supplies the dissolution tank 6 through a third pipeline 13. A third liquid inlet c is provided on the top of the dissolution tank 6 for connecting to an alkali solution source. An overflow pipe 9 is provided on the top of the side wall of the precipitation tank 5 to provide overflow liquid to the neutralization tank 4. The upstream end of the third pipeline 13 is provided at the bottom of the side wall of the precipitation tank 5. Usually, a feed pump is provided on the second pipeline, the third pipeline, and the fourth pipeline. Each alkali solution source uses a sodium hydroxide solution with a concentration of 10-12wt%, and a first agitator is provided in the neutralization tank 4, a second agitator is provided in the precipitation tank 5, and a third agitator is provided in the dissolution tank 6.

[0019] The working principle of the utility model is as follows: the obtained seed and fraction liquor enters the filling cylinder through the second interface and the first interface of the first four-way valve, and the liquid level gradually rises. In the process, it fully contacts with the filled chelate resin particles. After the gallium ions therein are fully adsorbed, the seed and fraction liquor is discharged to the evaporation system along the first interface and the second interface of the second four-way valve for concentration, and then returns to the refining process as the mother liquor. The third interface of the first four-way valve is controlled to be connected with the first interface, and the third interface of the second four-way valve is controlled to be connected with the first interface. Water is injected into the filling cylinder to elute the sodium aluminate solution remaining on the surface of the chelate resin, and used as a washing liquid to wash red mud. After washing, the fourth interface of the first four-way valve is controlled to be connected with the first interface, and the fourth interface of the second four-way valve is controlled to be connected with the first interface, sulfuric acid is introduced for analysis, and the obtained analysis liquid is sent to the neutralization tank, and the acid solution containing gallium ions is provided to the neutralization tank. After neutralization, precipitation, and dissolution, a sodium gallate solution is obtained, which can be sold to the outside for electrolysis to obtain gallium metal, thereby improving the utilization value of bauxite.

Claims

1. A device for recovering gallium from sodium aluminate solution, characterized in that: It comprises a vertically extending filling cylinder (3), a first four-way valve (1), a second four-way valve (2), a neutralization tank (4), a precipitation tank (5), and a dissolution tank (6), The filling tube (3) is filled with a plurality of chelating resin particles, and the two ends of the filling tube (3) are sealed by a top cover (7) and a base (8) respectively. The first interface of the first four-way valve (1) is connected to the base (8) and communicates with the filling cylinder (3); the second interface of the first four-way valve is used to connect to a sodium aluminate solution source; the third interface of the first four-way valve is connected to a water source; and the fourth interface of the first four-way valve is connected to an acid solution source. The first interface of the second four-way valve (2) is connected to the top cover (7) and communicates with the filling cylinder (3); the second interface of the second four-way valve is used to supply the evaporation system; the third interface of the second four-way valve is used to supply the red mud washing liquid source; the fourth interface of the second four-way valve is used to supply the neutralization tank (4) through the first pipeline (11); The neutralization tank (4) is provided with a first liquid inlet (a) on the top thereof for connecting to an alkali liquid source. The neutralization tank (4) supplies the precipitation tank (5) with materials via a second pipeline (12). The precipitation tank (5) is provided with a second liquid inlet (b) on the top thereof for connecting to an alkali liquid source. The precipitation tank (5) supplies the dissolution tank (6) with materials via a third pipeline (13). The dissolution tank (6) is provided with a third liquid inlet (c) on the top thereof for connecting to an alkali liquid source.

2. The device for recovering gallium from sodium aluminate solution according to claim 1, characterized in that: The chelating resin particles are Hepti gallium resin HPG319.

3. The device for recovering gallium from sodium aluminate solution according to claim 1, characterized in that: The neutralization tank (4) is provided with a first agitator, the precipitation tank (5) is provided with a second agitator, and the dissolution tank (6) is provided with a third agitator.

4. The device for recovering gallium from sodium aluminate solution according to claim 1, characterized in that: An overflow pipe (9) is provided on the top of the side wall of the sedimentation tank (5) to provide overflow liquid to the neutralization tank (4).

5. The device for recovering gallium from sodium aluminate solution according to claim 1, characterized in that: The upstream end of the third pipeline (13) is arranged at the bottom of the side wall of the sedimentation tank (5).

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