Device for recovering gallium in gallium-containing lime slag sediment

Abstract

The utility model aims to provide a device for recovering gallium in gallium-containing lime slag sediment. The device comprises a dissolving tank, a plate-and-frame filter press, a reaction tank, a filtrate tank, a neutralizing tank, a settling lime milk tank and a hot water pump, an outlet I is formed in the bottom of the dissolving tank and is connected with the top of the reaction tank through a pipeline I and a pump I; a liquid caustic soda inlet pipe I connected with a liquid caustic soda source is also arranged at the top of the reaction tank; an outlet in the bottom of the reaction tank is connected with an inlet of the plate-and-frame filter press through a pipeline II and a pump II; a filter cake outlet of the plate-and-frame filter press is connected with an inlet of the dissolving tank through a conveying device, a hot water pipe I is further arranged at the inlet of the dissolving tank and connected with a hot water header pipe, and the hot water header pipe is connected with a hot water source through a hot water pump; a filtrate outlet of the plate-and-frame filter press is connected with the top of the filtrate tank through a filtrate pipe; the bottom of the filtrate tank is connected with the top of the neutralizing tank through a pipeline III and a pump III; a discharge pipe and a discharge pump are arranged at the bottom of the neutralizing tank. According to the device, the gallium content in the gallium-containing lime slag sediment can be effectively reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of gallium recovery equipment in gallium-containing waste residue, and particularly relates to a gallium recovery device for precipitation of gallium-containing lime residue. Background Art

[0002] In the current prior art, in the process of recovering and extracting gallium from the mother liquor of the alumina system in an alumina plant, lime is often used for impurity precipitation treatment of gallium. However, an inevitable part of gallium is inevitably attached to the precipitation. Therefore, it is necessary to recover gallium from the gallium-containing lime precipitation.

[0003] Currently, the generally adopted method for washing the filter cake of a plate-and-frame filter press is as follows: the filter cake stays inside the filter plate of the plate-and-frame filter press, and is washed 1-2 times with 75°C hot water. However, the disadvantage of this method is that the filter cake cannot be dispersed, resulting in part of the gallium-rich liquid remaining in the filter cake after hot water washing, causing gallium loss. According to the semi-quantitative analysis results of lime residue, the average gallium content in lime residue is 3.24%. Calculated based on the total annual output of filter cake being about 320 tons and the filter cake containing 50% water, the gallium loss in lime residue is about 5.2 tons / year.

[0004] To sum up, in the current alumina plant, the washing method of using hot water to wash the filter cake, because the filter cake stays inside the filter press plate frame and cannot be dispersed, the washing water cannot be fully mixed with the filter cake, resulting in more gallium-rich liquid remaining in the filter cake, and finally causing a high gallium content in the filter cake and a large gallium loss in the impurity removal process. Therefore, it is necessary to develop a systematic gallium recovery device for precipitation of gallium-containing lime residue. Summary of the Invention

[0005] The utility model aims to provide a gallium recovery device for precipitation of gallium-containing lime residue, which can effectively reduce the gallium content in the precipitation of gallium-containing lime residue, solve the problem of high gallium content in the precipitation of gallium-containing lime residue, and improve the gallium recovery rate.

[0006] The gallium recovery device for precipitation of gallium-containing lime residue includes a dissolution tank, a plate-and-frame filter press, a reaction tank, a filtrate tank, a neutralization tank, a sedimentation ash milk tank, and a hot water pump;

[0007] The bottom of the dissolution tank is provided with an outlet I, and the outlet I is connected to the top of the reaction tank through a pipeline I and a pump I, and a valve I is provided on the pipeline I; a stirring device is provided in the dissolution tank 1; a liquid alkali inlet pipe I connecting to a liquid alkali source is further provided at the top of the reaction tank, and a liquid alkali valve I is provided on the liquid alkali inlet pipe I;

[0008] The outlet at the bottom of the reaction tank is connected to the inlet of the plate-and-frame filter press through a pipeline II and a pump II, and valves II are respectively provided on both sides of the pipeline II where the pump II is located; the reaction tank is provided with a water bath device capable of heating and cooling and a stirring device;

[0009] The filter cake outlet of the plate and frame filter press is connected to the inlet of the dissolution tank through a conveyor device. A hot water pipe I is also provided at the inlet of the dissolution tank. The hot water pipe I is connected to the hot water main pipe, and the hot water main pipe is connected to the hot water source through a hot water pump; a hot water valve I is provided on the hot water pipe I.

[0010] The filtrate outlet of the plate and frame filter press is connected to the top of the filtrate tank through a filtrate pipe, and a filtrate valve is provided on the filtrate pipe.

[0011] The bottom of the filtrate tank is connected to the top of the neutralization tank through pipeline III and pump III; valves III are respectively provided on both sides of pump III on pipeline III.

[0012] The bottom of the neutralization tank is provided with a discharge pipe and a discharge pump to send the reacted liquid in the neutralization tank to the impurity precipitation process of gallium to generate a new gallium-containing lime slag precipitate; a liquid alkali inlet pipe II connecting the liquid alkali source is also provided at the top of the neutralization tank, and a liquid alkali valve II is provided on the liquid alkali inlet pipe II.

[0013] A discharge pipe I is provided on pipeline I near outlet I, and a discharge valve I is provided on the discharge pipe I.

[0014] A hot water pipe II is provided on pipeline I. The hot water pipe II is connected to the hot water main pipe, and the hot water main pipe is connected to the hot water source through a hot water pump; a hot water valve II is provided on the hot water pipe II.

[0015] The bottom of the dissolution tank is provided with an outlet II. The outlet II is connected to the top of the sedimentation ash milk tank through pipeline IV and pump IV; valves IV are respectively provided on both sides of pump IV on pipeline IV.

[0016] A discharge pipe II is provided on pipeline IV near outlet II, and a discharge valve II is provided on the discharge pipe II.

[0017] A hot water pipe III is provided on pipeline IV. The hot water pipe III is connected to the hot water main pipe, and the hot water main pipe is connected to the hot water source through a hot water pump; a hot water valve III is provided on the hot water pipe III.

[0018] Flow meters are respectively provided on the liquid alkali inlet pipe I and the liquid alkali inlet pipe II.

[0019] A discharge pipe III is provided on pipeline III near the bottom of the filtrate tank, and a discharge valve III is provided on the discharge pipe III.

[0020] The working process of the present utility model is as follows:

[0021] The lime-precipitated slurry is sent into the plate and frame filter press for treatment. The filtrate is sent to the next process, and the filter cake is discharged to the dissolution tank with 0.5 m 3 of hot water added in advance through a conveyor device. After fully stirring and dispersing the filter cake, the slurry in the dissolution tank is transported to the reaction tank by pump I, and then 0.8 m 3Liquid caustic soda, which is a 35-40% NaOH solution with a pH of 10-12, is used to leach gallium from the filter cake. Then add 2m 3 Volume hot water, the total volume of the liquid is controlled at 4m 3 , react for a certain period of time under stirring. After the reaction is completed, the material is cooled to 70-80℃, and the feed liquid is transported to the plate and frame filter press by pump II for solid-liquid separation. The filtrate is a gallium-containing solution that enters the filtrate tank. After the filtrate tank stores a certain volume of filtrate, the gallium-containing solution is transported to the neutralization tank by pump III, and then a certain amount of alkali liquid is injected into the neutralization tank 3. The liquid alkali is a 35-40% NaOH solution. The pH value of the feed liquid in the tank is controlled in the range of 5-6, and the gallium ions are converted into gallium hydroxide precipitation to recover the gallium in the filter cake. The reaction formula is: Ga 3+ +3OH - →Ga(OH)3↓.

[0022] The filter cake in the plate and frame filter press is unloaded again into a dissolving tank into which a certain amount of hot water has been added in advance. After being fully stirred and broken up, the filter cake is transported to the sedimentation ash milk tank by pump IV as a lime milk additive and sent to the previous gallium impurity precipitation process to generate new gallium-containing lime slag precipitation.

[0023] The beneficial effects of the utility model are:

[0024] The equipment of the utility model realizes a more optimal filter cake washing and leaching gallium technology, laying a foundation for realizing industrialized production of gallium recovery by precipitation of gallium-containing lime slag.

[0025] The device of the utility model is provided with a dissolving tank with a stirring device, which can fully stir the block filter cake in the tank, creating conditions for the filter cake to fully contact and react with alkaline washing water; the reaction tank is equipped with a heating, cooling and stirring device to achieve accurate temperature control of the materials in the tank and full mixing and contact reaction of the materials. Under the action of the alkaline solution, the gallium in the filter cake is leached, and then the plate and frame filter press is used for solid-liquid separation again, so as to achieve the purpose of recovering the gallium in the filter cake and greatly reduce the loss of gallium in the filter cake. Compared with the existing technology, the gallium recovery rate of the device of the utility model can be increased by more than 50%. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of a gallium recovery device in gallium-containing lime slag precipitation in Example 1;

[0027] The serial numbers and names in the figure are as follows:

[0028] 1 - Dissolution tank, 2 - Plate and frame filter press, 3 - Reaction tank, 4 - Filtrate tank, 5 - Neutralization tank, 6 - Settling ash milk tank, 7 - Hot water main pipe, 8 - Pipeline I, 9 - Pump I, 10 - Valve I10, 11 - Liquid caustic soda inlet pipe I, 12 - Liquid caustic soda valve I, 13 - Pipeline II, 14 - Pump II, 15 - Valve II, 16 - Hot water pipe I, 17 - Hot water valve I, 18 - Filtrate pipe, 19 - Filtrate valve, 20 - Pipeline III, 21 - Pump III, 22 - Discharge pipe, 23 - Discharge pump, 24 - Liquid caustic soda inlet pipe II, 25 - Liquid caustic soda valve II, 26 - Discharge pipe I, 27 - Discharge valve I, 28 - Hot water pipe II, 29 - Hot water valve II, 30 - Pipeline IV, 31 - Pump IV, 32 - Discharge pipe II, 33 - Discharge valve II, 34 - Hot water pipe III, 35 - Hot water valve III, 36 - Flowmeter, 37 - Discharge pipe III, 38 - Discharge valve III, 39 - Valve III, 40 - Valve IV Detailed implementation mode

[0029] The present utility model will be specifically described below in conjunction with the accompanying drawings and embodiments. Embodiment 1

[0030] As Figure 1 shown, a gallium recovery device from gallium-containing lime slag precipitation includes a dissolution tank 1, a plate and frame filter press 2, a reaction tank 3, a filtrate tank 4, a neutralization tank 5, a settling ash milk tank 6, and a hot water pump;

[0031] The bottom of the dissolution tank 1 is provided with an outlet I, and the outlet I is connected to the top of the reaction tank 3 through a pipeline I 8 and a pump I 9, and a valve I 10 is provided on the pipeline I 8; a stirring device is provided in the dissolution tank 1; the top of the reaction tank 3 is further provided with a liquid caustic soda inlet pipe I 11 connecting to a liquid caustic soda source, and a liquid caustic soda valve I 12 is provided on the liquid caustic soda inlet pipe I 11;

[0032] The bottom of the dissolution tank 1 is provided with an outlet II, and the outlet II is connected to the top of the settling ash milk tank 6 through a pipeline IV 30 and a pump IV 31; valves IV 40 are respectively provided on both sides of the pump IV 31 on the pipeline IV 30.

[0033] A discharge pipe II 32 is provided on the pipeline IV 30 near the outlet II, and a discharge valve II 33 is provided on the discharge pipe II 32.

[0034] A hot water pipe III 34 is provided on the pipeline IV 30, the hot water pipe III 34 is connected to the hot water main pipe 7, and the hot water main pipe 7 is connected to a hot water source through a hot water pump; a hot water valve III 35 is provided on the hot water pipe III 34.

[0035] A discharge pipe I 26 is provided on the pipeline I 8 near the outlet I, and a discharge valve I 27 is provided on the discharge pipe I 26. A hot water pipe II 28 is provided on the pipeline I 8, the hot water pipe II 28 is connected to the hot water main pipe 7, and the hot water main pipe 7 is connected to a hot water source through a hot water pump; a hot water valve II 29 is provided on the hot water pipe II 28.

[0036] The outlet at the bottom of the reaction tank 3 is connected to the inlet of the plate and frame filter press 2 through pipeline II 13 and pump II 14. Valves II 15 are respectively arranged on both sides of pump II 14 on pipeline II 13; The reaction tank 3 is equipped with a water bath device and a stirring device capable of heating and cooling.

[0037] The filter cake outlet of the plate and frame filter press 2 is connected to the inlet of the dissolution tank 1 through a conveying device. A hot water pipe I 16 is also arranged at the inlet of the dissolution tank 1. The hot water pipe I 16 is connected to the hot water main pipe 7, and the hot water main pipe 7 is connected to a hot water source through a hot water pump; A hot water valve I 17 is arranged on the hot water pipe I 16.

[0038] The filtrate outlet of the plate and frame filter press 2 is connected to the top of the filtrate tank 4 through a filtrate pipe 18. A filtrate valve 19 is arranged on the filtrate pipe 18.

[0039] The bottom of the filtrate tank 4 is connected to the top of the neutralization tank 5 through pipeline III 20 and pump III 21; Valves III 39 are respectively arranged on both sides of pump III 21 on pipeline III 20; A discharge pipe III 37 is arranged on pipeline III 20 near the bottom of the filtrate tank 4, and a discharge valve III 38 is arranged on the discharge pipe III 37.

[0040] The bottom of the neutralization tank 5 is provided with a discharge pipe 22 and a discharge pump 23 to send the reacted liquid in the neutralization tank 5 to the impurity precipitation process of gallium to generate new gallium-containing lime slag precipitation; A liquid alkali inlet pipe II 24 connecting to a liquid alkali source is also arranged at the top of the neutralization tank 5. A liquid alkali valve II 25 is arranged on the liquid alkali inlet pipe II 24; Flow meters 36 are respectively arranged on the liquid alkali inlet pipe I 11 and the liquid alkali inlet pipe II 24.

Claims

1. A device for recovering gallium from gallium-containing lime slag precipitate, comprising a dissolution tank (1), a plate and frame filter press (2), a reaction tank (3), a filtrate tank (4), a neutralization tank (5), a sedimentation ash milk tank (6), and a hot water pump; characterized in that: An outlet I is provided at the bottom of the dissolution tank (1), and the outlet I is connected to the top of the reaction tank (3) through a pipeline I (8) and a pump I (9), and a valve I (10) is provided on the pipeline I (8); a stirring device is provided in the dissolution tank (1); a liquid caustic soda inlet pipe I (11) connecting to a liquid caustic soda source is further provided at the top of the reaction tank (3), and a liquid caustic soda valve I (12) is provided on the liquid caustic soda inlet pipe I (11); The outlet at the bottom of the reaction tank (3) is connected to the inlet of the plate and frame filter press (2) through a pipeline II (13) and a pump II (14), and valves II (15) are respectively provided on both sides of the pipeline II (13) where the pump II (14) is located; the reaction tank (3) is provided with a water bath device capable of heating and cooling and a stirring device; The filter cake outlet of the plate and frame filter press (2) is connected to the inlet of the dissolution tank (1) through a conveying device, and a hot water pipe I (16) is further provided at the inlet of the dissolution tank (1), and the hot water pipe I (16) is connected to a hot water main pipe (7), and the hot water main pipe (7) is connected to a hot water source through a hot water pump; a hot water valve I (17) is provided on the hot water pipe I (16); The filtrate outlet of the plate and frame filter press (2) is connected to the top of the filtrate tank (4) through a filtrate pipe (18), and a filtrate valve (19) is provided on the filtrate pipe (18); The bottom of the filtrate tank (4) is connected to the top of the neutralization tank (5) through a pipeline III (20) and a pump III (21); valves III (39) are respectively provided on both sides of the pipeline III (20) where the pump III (21) is located; A discharge pipe (22) and a discharge pump (23) are provided at the bottom of the neutralization tank (5) to send the reacted liquid in the neutralization tank (5) to the gallium impurity precipitation process to generate a new gallium-containing lime slag precipitate; a liquid caustic soda inlet pipe II (24) connecting to a liquid caustic soda source is further provided at the top of the neutralization tank (5), and a liquid caustic soda valve II (25) is provided on the liquid caustic soda inlet pipe II (24).

2. The gallium recovery device from gallium-containing lime slag precipitation according to claim 1, wherein: A discharge pipe I (26) is provided on the pipeline I (8) near the outlet I, and a discharge valve I (27) is provided on the discharge pipe I (26).

3. The device for recovering gallium from gallium-containing lime slag precipitation according to claim 1, wherein: A hot water pipe II (28) is provided on the pipeline I (8), and the hot water pipe II (28) is connected to the hot water main pipe (7), and the hot water main pipe (7) is connected to a hot water source through a hot water pump; a hot water valve II (29) is provided on the hot water pipe II (28).

4. The gallium recovery device from gallium-containing lime slag precipitation according to claim 1, wherein: An outlet II is provided at the bottom of the dissolution tank (1), and the outlet II is connected to the top of the sedimentation ash milk tank (6) through a pipeline IV (30) and a pump IV (31); valves IV (40) are respectively provided on both sides of the pipeline IV (30) where the pump IV (31) is located.

5. The gallium recovery device from gallium-containing lime slag precipitation according to claim 4, characterized in that: A discharge pipe II (32) is provided on the pipeline IV (30) near the outlet II, and a discharge valve II (33) is provided on the discharge pipe II (32).

6. The gallium recovery device from gallium-containing lime slag precipitation according to claim 4, characterized in that: A hot water pipe III (34) is provided on the pipeline IV (30). The hot water pipe III (34) is connected to the hot water main pipe (7), and the hot water main pipe (7) is connected to a hot water source via a hot water pump; a hot water valve III (35) is provided on the hot water pipe III (34).

7. The device for recovering gallium from gallium-containing lime slag precipitation according to claim 1, characterized in that: Flow meters (36) are respectively provided on the liquid caustic soda inlet pipe I (11) and the liquid caustic soda inlet pipe II (24).

8. The gallium recovery device from gallium-containing lime slag precipitation according to claim 1, characterized in that: A discharging pipe III (37) is provided on the pipeline III (20) near the bottom of the filtrate tank (4), and a discharging valve III (38) is provided on the discharging pipe III (37).

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