Device for recovering indium from sulfuric acid solution containing indium and iron

Abstract

The utility model discloses a device for recovering indium from a sulfuric acid solution containing indium and iron. The device comprises a tandem centrifugal extractor, a washing tank, an extraction tank, an extraction intermediate tank, a washing intermediate tank and a reverse extraction intermediate tank, the tandem centrifugal extractor comprises a plurality of centrifugal extraction units which are connected in sequence, an extractant inlet pipe and a raffinate outlet pipe are arranged on the centrifugal extraction unit at one end, and a material inlet pipe and a loaded organic phase outlet pipe are arranged on the centrifugal extraction unit at the other end; the raffinate outlet pipe is connected with a feeding hole of the extraction intermediate tank; the loaded organic phase outlet pipe is connected with a feeding hole of the box-type extraction tank; the washing tank is provided with a zinc washing liquid outlet and an organic phase outlet; an organic phase outlet of the washing tank is connected with a feeding hole of the extraction tank; the extraction tank is provided with an anti-indium liquid outlet and an anti-indium organic phase outlet, the zinc washing liquid outlet is connected with the washing intermediate tank, and the anti-indium liquid outlet is connected with the reverse extraction intermediate tank. The device has the advantages of small occupied area, good phase splitting effect and no mutual inclusion of oil and water.

Description

Technical Field

[0001] This utility model relates to the field of metallurgical engineering technology, and in particular to a device for recovering indium and iron from a sulfuric acid solution containing indium and iron. Background Technology

[0002] Indium is an important rare and dispersed metal widely used in aerospace, electronics, high technology, energy, medical, and defense industries. Currently, the main raw materials for indium extraction are hydrometallurgical zinc fumes, leaching residues, and ITO target waste. Solutions obtained from sulfuric acid leaching of indium-containing raw materials typically contain a large amount of ferric iron (Fe2+). During indium extraction and enrichment, it is usually necessary to remove or reduce the ferric iron beforehand to prevent excessive iron content in the indium-refining solution caused by co-extraction of ferric iron during the extraction process, which would affect subsequent indium purification processes. In hydrometallurgical zinc smelting, ferric iron is typically reduced using iron powder, zinc concentrate, or SO2 before indium-iron extraction and separation. This process is complex, requires large amounts of reducing agents, easily generates highly toxic arsine gas during reduction, and iron is easily oxidized by air during extraction, causing emulsification. Furthermore, there is a lack of suitable indium recovery equipment on the market. Utility Model Content

[0003] This invention provides an apparatus for recovering indium from a sulfuric acid solution containing indium and iron. This apparatus can implement a method for recovering indium from a sulfuric acid solution containing indium and iron without reducing the iron in the indium-containing raw material, thereby solving the technical problems mentioned in the background art.

[0004] To solve the above-mentioned technical problems, the technical solution proposed by this utility model is as follows:

[0005] An apparatus for recovering indium from an indium- and iron-containing sulfuric acid solution includes a series-connected centrifugal extractor, a washing tank, an extraction tank, an extraction intermediate tank, a washing intermediate tank, and a back-extraction intermediate tank. The series-connected centrifugal extractor comprises multiple centrifugal extraction units connected in sequence. One centrifugal extraction unit is equipped with an extractant inlet pipe and a raffinate outlet pipe, while the other centrifugal extraction unit is equipped with a material inlet pipe and a loaded organic phase outlet pipe. The raffinate outlet pipe is connected to the inlet of the extraction intermediate tank. The loaded organic phase outlet pipe is connected to the inlet of the box-type extraction tank. The washing tank is equipped with a zinc washing solution outlet and an organic phase outlet. The organic phase outlet of the washing tank is connected to the inlet of the extraction tank. The extraction tank is equipped with a reverse indium solution outlet and a reverse indium organic phase outlet. The zinc washing solution outlet is connected to the washing intermediate tank, and the reverse indium solution outlet is connected to the back-extraction intermediate tank.

[0006] As a further preferred embodiment of the above technical solution, the device further includes an anti-iron tank, wherein the outlet of the anti-indium organic phase is connected to the inlet of the anti-iron tank.

[0007] As a further preferred embodiment of the above technical solution, the device further includes a clarification tower, wherein the outlet of the anti-iron trough is connected to the inlet of the clarification tower; the clarification tower includes an organic phase outlet disposed on the upper side of the clarification tower body and an anti-iron liquid outlet disposed on the lower side of the clarification tower body.

[0008] As a further preferred embodiment of the above technical solution, the outlet of the clarification tower is connected to a filter device via a pipeline, and the liquid outlet of the filter device is connected to the feed inlet of the anti-iron tank.

[0009] As a further preferred embodiment of the above technical solution, the organic phase outlet of the clarification tower is connected to the extractant inlet of the centrifugal extractor.

[0010] As a further preferred embodiment of the above technical solution, a stirring device is provided inside the anti-iron trough.

[0011] As a further preferred embodiment of the above technical solution, the washing tank and the extraction tank are integrated into a box-type extraction tank.

[0012] As a further preferred embodiment of the above technical solution, the series centrifugal extractor is formed by connecting four to six centrifugal extractors in series.

[0013] This utility model has the following beneficial effects:

[0014] This invention relates to an apparatus for recovering indium from sulfuric acid solutions containing indium and iron. The recovery of indium and iron is achieved through different process stages. Compared with traditional indium and iron extraction tanks, this asynchronous centrifugal extractor for indium and iron has the advantages of small footprint, good phase separation effect, and no oil-water mixture. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the apparatus for recovering indium from an indium- and iron-containing sulfuric acid solution in Example 1.

[0016] Legend:

[0017] 1. Series centrifugal extractor; 2. Box-type extraction tank; 3. Anti-iron tank; 4. Clarification tower; 5. Vacuum filter; 6. Extraction intermediate tank; 7. Washing intermediate tank; 8. Back-extraction intermediate tank; 9. Stirring device. Detailed Implementation

[0018] The present invention will be described in detail below with reference to the accompanying drawings and embodiments. However, the present invention can be implemented in many different ways as defined and covered by the claims.

[0019] Example 1:

[0020] The apparatus for recovering indium from an indium- and iron-containing sulfuric acid solution according to this embodiment includes a four-stage series centrifugal extractor 1, a box-type extraction tank 2, an anti-iron tank 3, a clarification tower 4, a vacuum filter 5, an extraction intermediate tank 6, a washing intermediate tank 7, and a back-extraction intermediate tank 8. The four-stage series centrifugal extractor 1 includes four centrifugal extraction units, connecting pipes, an extractant inlet pipe, a material inlet pipe, a loaded organic phase outlet pipe, and a raffinate outlet pipe. The four centrifugal extraction units are connected sequentially by connecting pipes. The centrifugal extraction unit at one end is equipped with an extractant inlet pipe and a raffinate outlet pipe, while the centrifugal extraction unit at the other end is equipped with a material inlet pipe and a loaded organic phase outlet pipe. The loaded organic phase outlet pipe is connected to the feed inlet of the box-type extraction tank 2.

[0021] The aforementioned box-type extraction tank 2 includes a four-stage washing tank 21 and a seven-stage extraction tank 22 connected in sequence. The organic phase outlet pipe is connected to the inlet of the washing tank 21. The washing tank 21 is provided with a zinc washing solution outlet and an organic phase outlet. The extraction tank 22 is provided with an indium-reverse solution outlet and an indium-reverse organic phase outlet. The zinc washing solution outlet is connected to the intermediate washing tank 7. The indium-reverse solution outlet is connected to the intermediate back-extraction tank 8. The indium-reverse organic phase is connected to the inlet of the anti-iron tank 3. The outlet of the anti-iron tank 3 is connected to the inlet of the clarification tower 4.

[0022] The clarification tower 4 includes an organic phase outlet located on the upper side of the tower body and an anti-iron liquid outlet located on the lower side of the tower body. The anti-iron liquid outlet of the clarification tower 4 is connected to the feed inlet of the vacuum filter 5. The organic phase outlet of the clarification tower 4 is connected to the extractant inlet of the series centrifugal extractor 1 through a pipeline. The liquid outlet of the vacuum filter 5 is connected to the feed inlet of the anti-iron tank 3 through a pipeline and a booster pump, with the boosting direction from the vacuum filter 5 to the anti-iron tank 3.

[0023] A stirring device 9 is installed inside the anti-iron trough 3; the stirring device 9 includes a motor, blades and a rotating shaft, the output shaft of the motor is coaxially and fixedly connected to the rotating shaft, and stirring blades are fixedly connected to the rotating shaft.

[0024] During operation, the raw material is a sulfuric acid solution containing indium and iron. The raw material is fed into a four-stage series centrifugal extractor 1 through a material inlet pipe. Extractant is introduced through an extractant inlet pipe. Through multi-stage extraction, the raw material is separated into a loaded organic phase and a raffinate. The raffinate is a zinc sulfate solution, which is fed into an intermediate extraction tank 6 through a raffinate outlet pipe. The loaded organic phase is an organic phase containing iron, indium, and zinc ions, meaning the zinc ions are separated from the loaded organic phase. The loaded organic phase is fed into a box-type extraction tank 2 through a loaded organic phase outlet pipe. After washing and indium-reversing operations, zinc washing solution, indium-reversing solution, and indium-reversing organic phase are obtained from the zinc washing solution outlet, indium-reversing solution outlet, and indium-reversing organic phase outlet, respectively. The zinc washing solution is fed into a washing intermediate tank 7. The extraction intermediate tank 6 and washing intermediate tank 7... The intermediate solution can be combined and sent to the zinc recovery system; the anti-indium solution is fed into the anti-extraction intermediate tank 8, and then into the indium electrolysis system; the anti-indium organic phase is fed into the anti-iron tank 3, which is an organic phase containing iron ions, that is, the iron ions are separated from the anti-indium organic phase; then the anti-indium organic phase is fully mixed with the anti-iron agent under the action of the stirring device 9, and the resulting mixed solution is fed into the clarification tower 4 through the pipe at the bottom of the anti-iron tank 3 for phase separation, generating an empty organic phase and an anti-iron liquid. The empty organic phase is fed into the four-stage series centrifugal extractor 1 through the pipe and the lift pump, and reused as an extractant. The anti-iron liquid is fed into the vacuum filter 5 from the clarification tower 4 for solid-liquid separation. The solid is oxalic acid; the liquid is fed into the anti-iron tank 3 through the pipe and the lift pump.

[0025] The above description is merely a preferred embodiment of this utility model, and the protection scope of this utility model is not limited to the above embodiments. For those skilled in the art, improvements and modifications obtained without departing from the technical concept of this utility model should also be considered within the protection scope of this utility model.

[0026] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. An apparatus for recovering indium from a sulfuric acid solution containing indium and iron, characterized in that, The apparatus includes a series centrifugal extractor (1), a washing tank (21), an extraction tank (22), an extraction intermediate tank (6), a washing intermediate tank (7), and a back-extraction intermediate tank (8). The series centrifugal extractor (1) includes multiple centrifugal extraction units connected in sequence. One centrifugal extraction unit is equipped with an extractant inlet pipe and a raffinate outlet pipe, while the other centrifugal extraction unit is equipped with a material inlet pipe and a loaded organic phase outlet pipe. The raffinate outlet pipe is connected to the inlet of the extraction intermediate tank (6). The loaded organic phase outlet pipe is connected to the inlet of the washing tank. The washing tank (21) is equipped with a zinc washing solution outlet and an organic phase outlet. The organic phase outlet of the washing tank (21) is connected to the inlet of the extraction tank (22). The extraction tank (22) is equipped with an indium reverse solution outlet and an indium reverse organic phase outlet. The zinc washing solution outlet is connected to the washing intermediate tank (7), and the indium reverse solution outlet is connected to the back-extraction intermediate tank (8).

2. The apparatus for recovering indium from an indium- and iron-containing sulfuric acid solution according to claim 1, characterized in that, It also includes an anti-iron tank (3), wherein the outlet of the anti-indium organic phase is connected to the inlet of the anti-iron tank (3).

3. The apparatus for recovering indium from an indium- and iron-containing sulfuric acid solution according to claim 2, characterized in that, It also includes a clarification tower (4), the outlet of the anti-iron trough (3) is connected to the inlet of the clarification tower (4); the clarification tower (4) includes an organic phase outlet located on the upper side of the clarification tower (4) and an anti-iron liquid outlet located on the lower side of the clarification tower (4).

4. The apparatus for recovering indium from an indium- and iron-containing sulfuric acid solution according to claim 3, characterized in that, The outlet of the clarification tower (4) is connected to a filter device via a pipeline, and the liquid outlet of the filter device is connected to the feed inlet of the anti-iron tank (3).

5. The apparatus for recovering indium from an indium- and iron-containing sulfuric acid solution according to claim 3, characterized in that, The organic phase outlet of the clarification tower (4) is connected to the extractant inlet of the series centrifugal extractor (1).

6. The apparatus for recovering indium from an indium- and iron-containing sulfuric acid solution according to claim 2, characterized in that, The anti-iron trough (3) is equipped with a stirring device (9).

7. The apparatus for recovering indium from an indium- and iron-containing sulfuric acid solution according to any one of claims 1-6, characterized in that, The washing tank (21) and the extraction tank (22) are integrated into a box-type extraction tank.

8. The apparatus for recovering indium from an indium- and iron-containing sulfuric acid solution according to any one of claims 1-5, characterized in that, The series centrifugal extractor is formed by connecting four to six centrifugal extractors in series.

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