Tin element material recovery device

Abstract

The utility model discloses a tin element material recovery device, belongs to the technical field of tin recovery, and solves the problem that a large amount of strongly acidic wastewater with iron ions is generated due to the adoption of a strongly acidic leaching agent in the existing tin hydrometallurgy. The system comprises a crusher used for crushing a tin-containing material, a screening machine used for screening the crushing granularity, an oxidizing furnace, a first acid leaching reactor used for preliminarily dissolving the tin-containing material, a first filter used for filtering out an undissolved tin-containing material, a PH adjusting tank used for generating ferric hydroxide and a second filter used for removing ferric hydroxide which are communicated in sequence, and the third acid leaching reactor is communicated with the extraction machine. According to the utility model, the tin-containing material is subjected to oxidation treatment to oxidize all ferrous ions into ferric ions, the ferric ions form ferric hydroxide precipitates through the pH adjusting tank to be removed, iron impurities are reduced, and meanwhile, the tin-containing material is dissolved twice, so that the acidity requirement is reduced, and the emission standard of waste liquid is favorably met.

Description

Technical Field

[0001] The utility model relates to the technical field of tin recovery, and particularly relates to a material recovery device for tin elements. Background Art

[0002] In the hydrometallurgy of tin, for medium and low-grade tin ores, generally, the raw materials need to be leached with mixed acid, and then through the steps of precipitation, dissolution, and extraction, the tin elements can be enriched, and subsequent reduction can be carried out to obtain metallic tin. Leaching is the step of converting valuable metals in raw materials such as tin ores from insoluble solid forms to soluble solutes, and it is also the key step that determines the recovery rate of subsequent valuable elements, impurity removal, and refining difficulty.

[0003] According to the principle of chemical reaction equilibrium, the stronger the acidity, the more thorough the reaction between natural minerals in the form of oxides, hydroxides, etc. and the acid, and the faster the reaction rate. Therefore, strong acidic leaching agents are generally used in conventional leaching to improve the leaching rate. Especially for materials with low content of valuable elements, it is more necessary to increase the acidity to enhance the leaching rate. However, due to the high content of iron elements in tin materials, and they mostly exist in the forms of divalent iron and trivalent iron. Under strong acid conditions, iron elements will finally enter the solution in the form of divalent iron ions and trivalent iron ions, and divalent iron ions cannot precipitate in an alkaline environment. Therefore, simply using a strong acidic leaching agent will not only produce a large amount of acidic wastewater, resulting in strong acidity and high environmental protection treatment costs, but also cause problems such as difficulty in meeting the emission standards due to the high content of iron elements. Summary of the Utility Model

[0004] In view of the above problems in the prior art, the utility model provides a material recovery device for tin elements, which solves the problem of generating a large amount of strongly acidic wastewater with iron ions in the existing tin hydrometallurgy due to the use of a strong acidic leaching agent.

[0005] In order to achieve the above purpose, the technical scheme adopted by the utility model is as follows:

[0006] Provide a material recovery device for tin elements, including a crusher for crushing tin-containing materials, a screening machine for screening the crushing particle size, an oxidation furnace, a first acid leaching reactor for preliminarily dissolving tin-containing materials, a first filter for filtering out undissolved tin-containing materials, a pH adjustment tank for generating iron hydroxide, a second filter for removing iron hydroxide, a third acid leaching reactor, and an extraction machine, which are connected in sequence; the filter end of the first filter is connected to a second acid leaching reactor for secondary dissolution of tin-containing materials, and the liquid outlet of the second acid leaching reactor is connected to the third acid leaching reactor through a third filter.

[0007] The working principle of this solution is as follows: The tin-containing material is crushed by a crusher. After crushing, the tin-containing material is screened by a screening machine to separate the tin-containing material with a particle size meeting the requirements, and then sent to an oxidation furnace for oxidation. Among them, iron elements and tin elements are respectively oxidized into ferric oxide and tin dioxide. Then, a first acid leaching reactor is used to preliminarily dissolve out tin ions and ferric ions, and the pH value of itself is adjusted through a pH adjustment tank to form a weak base environment that neither affects the dissolution of tin nor enables ferric ions to form ferric hydroxide precipitation. The ferric hydroxide precipitation is removed by filtration through a second filter, and the tin ion solution enters the third acid leaching reactor. The filter residue filtered out by the second filter is dissolved twice in a second acid leaching reactor. The second acid leaching reactor filters the tin solution through a third filter and then enters the third acid leaching reactor. Finally, the tin element is extracted by an extraction machine. Compared with the existing technology that directly dissolves tin-containing materials with strong acids, this solution first oxidizes the tin-containing materials, oxidizes tin and iron, which not only facilitates the dissolution of tin, but also all divalent iron ions become trivalent iron ions, and the trivalent iron ions can form ferric hydroxide precipitation and be removed through the pH adjustment tank. At the same time, the tin-containing materials are dissolved in two steps, reducing the acidity requirements for the first acid leaching reactor, the second acid leaching reactor, and the third acid leaching reactor. Therefore, this solution not only removes iron ions in the form of precipitates, but also reduces the acidity of acidic liquids, facilitating the achievement of the waste liquid discharge standard.

[0008] Further, the third acid leaching reactor is connected to the second acid leaching reactor through a one-way reflux pipe. The leaching agent in the third acid leaching reactor can be reused in the second acid leaching reactor, reducing the use of the leaching agent.

[0009] Further, the fine material outlet of the screening machine is connected to the feed inlet of the oxidation furnace, and the coarse material outlet of the screening machine is connected to the feed inlet of the crusher through a return pipe. The coarser tin-containing materials are repeatedly crushed in the crusher to ensure that the tin-containing materials have a lower particle size, which is conducive to the dissolution of the tin-containing materials.

[0010] Further, the gas outlet of the oxidation furnace is connected to an oxygen tank. The oxygen tank provides oxygen for the oxidation furnace, ensuring the full oxidation of tin and iron.

[0011] Further, the first acid leaching reactor, the second acid leaching reactor, and the third acid leaching reactor have the same structure and each includes an acid leaching reaction kettle, and a stirring shaft is rotatably arranged in the acid leaching reaction kettle. The stirring shaft is conducive to the full reaction of the tin-containing materials with the leaching agent.

[0012] Further, heating pipes are arranged on the top of the inner wall of each acid leaching reaction kettle, and protective covers are arranged on the heating pipes. The heating pipes are arranged on the top to avoid interference with the stirring shaft, and the heating pipes increase the temperature of the leaching agent, which is conducive to the dissolution of tin and reduces the acidity requirements. The setting of the protective covers prevents the tin-containing materials from damaging the heating pipes.

[0013] Further, the second acid leaching reactor is connected to a complexing agent tank, and the complexing agent in the complexing agent tank is citric acid or ethylenediaminetetraacetic acid. Citric acid or ethylenediaminetetraacetic acid can form stable complexes with iron ions, thereby reducing the dissolution of iron ions.

[0014] Further, the pH adjustment tank includes a tank body, the tank body is connected to an alkali solution tank through a metering pump, and a pH sensor is also arranged in the tank body. Both the metering pump and the pH sensor are electrically connected to a controller. The pH sensor detects the pH value of the tank body and transmits it to the controller, and the controller transports the alkali solution in the alkali solution tank to the tank body through the metering pump so that the tank body reaches the set pH value.

[0015] The utility model discloses a material recovery device for tin elements, and its beneficial effects are as follows:

[0016] 1. The utility model oxidizes the tin-containing material, which not only facilitates the dissolution of tin, but also oxidizes all divalent iron ions into trivalent iron ions, and removes the trivalent iron ions as ferric hydroxide precipitate through the pH adjustment tank, reducing iron impurities. At the same time, the tin-containing material is dissolved in two times, reducing the acidity requirement and facilitating the achievement of the waste liquid discharge standard.

[0017] 2. The utility model enables the leaching agent in the third acid leaching reactor to be reused in the second acid leaching reactor through the one-way reflux pipe of the third acid leaching reactor, reducing the use of the leaching agent. Description of the Drawings

[0018] Figure 1 It is a schematic structural diagram of the material recovery device for tin elements;

[0019] Wherein: 1. Crusher; 2. Screening machine; 3. Oxidation furnace; 31. Oxygen tank; 4. First acid leaching reactor; 5. First filter; 6. pH adjustment tank; 61. Tank body; 62. pH sensor; 63. Controller; 64. Metering pump; 65. Alkali solution tank; 7. Second filter; 8. Second acid leaching reactor; 81. Complexing agent tank; 9. Third filter; 10. Third acid leaching reactor; 11. Extractor. Specific Embodiments

[0020] The following describes the specific embodiments of the utility model to facilitate the understanding of the utility model by those skilled in the art of the present technology. However, it should be clear that the utility model is not limited to the scope of the specific embodiments. For those of ordinary skill in the art of the present technology, as long as various changes are within the spirit and scope of the utility model defined and determined by the appended claims, these changes are obvious, and all utility models created using the concept of the utility model are within the scope of protection.

[0021] Reference Figure 1, this embodiment provides a material recovery device for tin elements, including a crusher 1 for crushing tin-containing materials, a screening machine 2 for screening the crushing particle size, an oxidation furnace 3, a first acid leaching reactor 4 for preliminarily dissolving tin-containing materials, a first filter 5 for filtering out undissolved tin-containing materials, a pH adjustment tank 6 for generating iron hydroxide, a second filter 7 for removing iron hydroxide, a third acid leaching reactor 10, and an extraction machine 11, which are connected in sequence.

[0022] Among them, the fine material outlet of the screening machine 2 is connected to the feed inlet of the oxidation furnace 3, and the coarse material outlet of the screening machine 2 is connected to the feed inlet of the crusher 1 through a return pipe. The coarser tin-containing materials are repeatedly crushed in the crusher 1 to ensure that the tin-containing materials have a lower particle size, which is conducive to the dissolution of tin-containing materials.

[0023] In order to ensure that the oxidation furnace 3 can fully oxidize tin and iron, the gas port of the oxidation furnace 3 is connected to an oxygen tank 31, and the oxygen tank 31 provides oxygen for the oxidation furnace 3. The oxidation furnace 3 in this embodiment is an electric oxidation furnace.

[0024] In order to dissolve tin-containing materials for the second time, the filter screen end of the first filter 5 is connected to the second acid leaching reactor 8, and the liquid outlet of the second acid leaching reactor 8 is connected to the third acid leaching reactor 10 through a third filter 9.

[0025] The third acid leaching reactor 10 is connected to the second acid leaching reactor 8 through a one-way reflux pipe. The leaching agent in the third acid leaching reactor 10 can be reused in the second acid leaching reactor 8, reducing the use of the leaching agent.

[0026] In this embodiment, the first acid leaching reactor 4, the second acid leaching reactor 8, and the third acid leaching reactor 10 have the same structure and each includes an acid leaching reaction kettle, and a stirring shaft is rotatably arranged in the acid leaching reaction kettle. The stirring shaft is conducive to the full reaction of tin-containing materials with the leaching agent. And a heating pipe is arranged on the top of the inner wall of each acid leaching reaction kettle. The heating pipe is arranged on the top to avoid interference with the stirring shaft, and the heating pipe increases the temperature of the leaching agent, which is conducive to the dissolution of tin and reduces the acidity requirement. A protective cover is arranged on the heating pipe, and the arrangement of the protective cover prevents tin-containing materials from damaging the heating pipe.

[0027] In order to reduce the dissolution of iron ions in tin-containing materials during the second dissolution, the second acid leaching reactor 8 is connected to a complexing agent tank 81, and the complexing agent in the complexing agent tank 81 is citric acid or ethylenediaminetetraacetic acid. Citric acid or ethylenediaminetetraacetic acid can form stable complexes with iron ions.

[0028] As the specific structure of the pH adjustment tank 6, the pH adjustment tank 6 in this embodiment includes a tank body 61. The tank body 61 is connected to an alkali solution tank 65 through a metering pump 64. A pH sensor 62 is also arranged in the tank body 61. Both the metering pump 64 and the pH sensor 62 are electrically connected to a controller 63. The pH sensor 62 detects the pH value of the tank body 61 and transmits it to the controller 63. The controller 63 transports the alkali solution in the alkali solution tank 65 to the tank body 61 through the metering pump 64 so that the tank body 61 reaches the set pH value. The controller 63 can be a single-chip microcomputer or an industrial control computer.

[0029] The crusher 1, the screening machine 2, the oxidation furnace 3, the acid leaching reactor, the first filter 5, the second filter 7 and the third filter 9, the pH sensor 62, the metering pump 64 and the extraction machine 11 in this embodiment are all prior arts. Since they are prior arts, the specific working principles and connection relationships thereof will not be elaborated in this embodiment.

[0030] In summary, the working principle of this solution is as follows:

[0031] The tin-containing material is crushed by the crusher 1. After crushing, the tin-containing material is screened by the screening machine 2 to screen out the tin-containing material with a particle size meeting the requirements and sent to the oxidation furnace 3 for oxidation. Among them, iron elements and tin elements are respectively oxidized into ferric oxide and tin dioxide. Then, the first acid leaching reactor 4 is used to preliminarily dissolve out tin ions and ferric ions, and the pH value of itself is adjusted by the pH adjustment tank 6 to form a weak base environment that does not affect the dissolution of tin and can make ferric ions form ferric hydroxide precipitate. The ferric hydroxide precipitate is filtered out by the second filter 7, and the tin ion solution enters the third acid leaching reactor 10. The filter residue filtered out by the second filter 7 is secondarily dissolved by the second acid leaching reactor 8. The second acid leaching reactor 8 filters the tin solution through the third filter 9 and then enters the third acid leaching reactor 10. Finally, the tin element is extracted by the extraction machine 11.

[0032] Compared with the prior art that directly dissolves the tin-containing material with strong acid, this solution first oxidizes the tin-containing material, oxidizes tin and iron, which not only facilitates the dissolution of tin, but also enables ferric ions to form ferric hydroxide precipitate and be removed through the pH adjustment tank 6. At the same time, the tin-containing material is dissolved in two times, reducing the acidity requirements for the first acid leaching reactor 4, the second acid leaching reactor 8 and the third acid leaching reactor 10. Therefore, this solution not only removes iron ions in the form of precipitate, but also reduces the acidity of the acidic liquid, which is conducive to meeting the waste liquid discharge standard.

[0033] Although the specific implementation manners of the utility model are described in detail in combination with the drawings, it should not be construed as a limitation on the protection scope of this patent. Within the scope described in the claims, various modifications and deformations that can be made by those skilled in the art without creative labor still fall within the protection scope of this patent.

Claims

1. A material recovery device for tin element, characterized in that: The invention comprises a crusher (1) for crushing tin-containing materials, a sieving machine (2) for screening the crushed particle size, an oxidation furnace (3), a first acid leaching reactor (4) for preliminarily dissolving the tin-containing materials, a first filter (5) for filtering out undissolved tin-containing materials, a pH regulating tank (6) for generating iron hydroxide, a second filter (7) for removing iron hydroxide, a third acid leaching reactor (10) and an extractor (11) which are connected in sequence; The filter screen end of the first filter (5) is connected to a second acid leaching reactor (8) for secondary dissolution of tin-containing materials, and the liquid outlet of the second acid leaching reactor (8) is connected to the third acid leaching reactor (10) through a third filter (9).

2. The material recovery device of tin element according to claim 1, characterized in that: The third acid leaching reactor (10) is connected to the second acid leaching reactor (8) via a one-way reflux pipe.

3. The material recovery device of tin element according to claim 1, characterized in that: The fine material port of the screening machine (2) is connected to the feed port of the oxidation furnace (3), and the coarse material port of the screening machine (2) is connected to the feed port of the crusher (1) through a return pipe.

4. The material recovery device of tin element according to claim 1, characterized in that: The gas port of the oxidation furnace (3) is in communication with the oxygen tank (31).

5. The material recovery device of tin element according to claim 1, characterized in that: The first acid leaching reactor (4), the second acid leaching reactor (8) and the third acid leaching reactor (10) have the same structure and all comprise an acid leaching reactor, wherein a stirring shaft is rotatably arranged inside the acid leaching reactor.

6. The material recovery device of tin element according to claim 5, characterized in that: A heating tube is arranged on the top of the inner wall of each acid leaching reactor, and a protective cover is arranged on the heating tube.

7. The material recovery device of tin element according to claim 1, characterized in that: The second acid leaching reactor (8) is connected to a complexing agent tank (81), and the complexing agent in the complexing agent tank (81) is citric acid or ethylenediaminetetraacetic acid.

8. The material recovery device of tin element according to claim 1, characterized in that: The pH regulating tank (6) comprises a tank body (61), the tank body (61) is connected to an alkaline solution tank (65) via a metering pump (64), a pH sensor (62) is also arranged in the tank body (61), and both the metering pump (64) and the pH sensor (62) are electrically connected to a controller (63).

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