Raw material ammonia leaching and acid precipitation equipment for preparing high-purity molybdenum trioxide

Abstract

The utility model discloses raw material ammonia leaching and acid precipitation equipment for preparing high-purity molybdenum trioxide, which comprises an ammonia leaching reaction kettle and an acid precipitation reaction kettle, and a purification adjusting mechanism is arranged between the ammonia leaching reaction kettle and the acid precipitation reaction kettle; the purification adjusting mechanism comprises a primary filtering assembly, a purification tank, a secondary purification assembly, a pH adjusting tank and a buffer tank, the ammonia leaching device relates to the technical field of chemical equipment, the primary filtering assembly is used for separating filter residues in ammonia leaching liquid guided out by the ammonia leaching reaction kettle, the filtered reaction liquid enters the purification tank for deep purification, and the secondary purification assembly is used for purifying the ammonia leaching liquid. The ammonium molybdate solution enters a first-stage filtering assembly and is matched with a second-stage filtering assembly to separate reaction precipitates, the separated clean ammonium molybdate solution further enters a pH adjusting tank, the pH value of the ammonium molybdate solution is adjusted, and the solution adjusted in place is supplied into a buffer tank and is supplied into an acid precipitation reaction kettle through a pumping assembly to be subjected to acid precipitation treatment; the structure is compact, and the automation degree is high.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of chemical equipment, concretely is raw material ammonia leaching acid precipitation equipment for high -purity molybdenum trioxide preparation. BACKGROUND

[0002] Molybdenum trioxide (MoO3) is an important industrial raw material, and its high-purity product is widely used in the fields of catalysts, electronic materials, etc. In the traditional preparation process, ammonia leaching and acid precipitation are key steps:

[0003] Ammonia leaching: the molybdenum-containing raw material (such as molybdenum concentrate or waste catalyst) is reacted with ammonia water to generate ammonium molybdate solution;

[0004] Acid precipitation: acid (such as nitric acid) is added to the ammonium molybdate solution to adjust the pH value to precipitate molybdenum trioxide.

[0005] In the prior art, ammonia leaching and acid precipitation are usually carried out in independent equipment, which has the following problems: 1. The transfer of the reaction liquid needs manual operation, which is low in efficiency and easy to introduce impurities; 2. The ammonium molybdate solution after ammonia leaching is not purified thoroughly, and the pH value control precision is poor, which affects the subsequent acid precipitation reaction rate, resulting in unstable purity of the molybdenum trioxide precipitate. In view of this, the above problems are studied in depth, and the present case is generated. SUMMARY

[0006] In view of the deficiencies of the prior art, the utility model provides a raw material ammonia leaching acid precipitation equipment for high-purity molybdenum trioxide preparation, which solves the problems raised in the background art.

[0007] To achieve the above purpose, the utility model realizes the following technical scheme: a raw material ammonia leaching acid precipitation equipment for high-purity molybdenum trioxide preparation, comprising an ammonia leaching reactor and an acid precipitation reactor, a purification adjusting mechanism is arranged between the ammonia leaching reactor and the acid precipitation reactor;

[0008] The purification adjusting mechanism comprises a primary filtration assembly, a purification tank, a secondary purification assembly, a pH adjusting tank and a buffer tank, the feed end of the primary filtration assembly is connected with the outlet of the ammonia leaching reactor through a slurry pump, the liquid outlet end of the primary filtration assembly is connected with the inlet of the purification tank, the liquid inlet end of the secondary purification assembly is connected with the outlet end of the purification tank through a booster pump, the inlet end of the pH adjusting tank is connected with the liquid outlet end of the secondary purification assembly, the buffer tank is arranged below the pH adjusting tank and is connected with the lower end outlet of the pH adjusting tank, and the outlet end of the buffer tank is connected with the acid precipitation reactor through a pumping assembly.

[0009] The top of the purification tank is provided with a driving assembly, the output end of the driving assembly is connected with a stirring shaft, double-layer turbine type stirring paddles are installed on the stirring shaft, and a purification agent adding assembly is arranged on one side of the driving assembly.

[0010] The above-mentioned purification agent dosing assembly includes a drug storage chamber, a drug delivery pump, a drug injection pipe, a flow meter, and an electromagnetic flow valve. The inlet end of the drug delivery pump is connected to the drug storage chamber. One end of the drug injection pipe extends into the purification tank and the other end is connected to the outlet end of the drug delivery pump. The flow meter and the electromagnetic flow valve are both installed on the drug injection pipe.

[0011] The pH adjustment tank is equipped with a rotary drive component at the top, a fixed shaft at the output end of the rotary drive component, a stirring paddle on the fixed shaft, an acid-base sensor inside the pH adjustment tank, and two sets of reagent dripping components at the top of the pH adjustment tank.

[0012] The above-mentioned reagent dispensing component includes a reagent chamber, a dispensing tube, a regulating valve, and a dispensing control device. The lower end of the dispensing tube extends into the pH adjusting tank and the upper end is connected to the reagent chamber. The regulating valve is located on the dispensing tube, and the dispensing control device is located on the top of the reagent chamber with one end extending into the reagent chamber.

[0013] The aforementioned dripping control component includes a lead screw module, a movable seat, a push rod, and a rubber piston. The lead screw module is located on the top of the reagent chamber, the movable seat is mounted on the movable end of the lead screw module, the upper end of the push rod is connected to the movable seat, and the lower end extends into the reagent chamber. The rubber piston is located inside the reagent chamber and slides and seals against the inner wall of the reagent chamber. The top of the rubber piston is fixedly connected to the push rod.

[0014] The aforementioned primary filtration component is a filter press or a centrifugal separator.

[0015] The aforementioned secondary purification components are cartridge filters, microporous filters, or ceramic filters.

[0016] This invention provides an ammonia leaching and acid precipitation device for preparing high-purity molybdenum trioxide. It offers the following advantages: This ammonia leaching and acid precipitation device adds a purification and adjustment mechanism between the ammonia leaching reactor and the acid precipitation reactor used in existing high-purity molybdenum trioxide preparation processes. This mechanism includes a primary filtration component, a purification tank, a secondary purification component, a pH adjustment tank, and a buffer tank. This achieves automated transfer of the reaction solution, and during the transfer process, the reaction solution undergoes deep purification and pH adjustment. The primary filtration component separates the filter residue from the ammonia leaching solution exported from the ammonia leaching reactor. The filtered reaction solution then enters the purification tank for deep purification, where the secondary filtration component further separates the reaction precipitate. The clean ammonium molybdate solution after separation further enters the pH adjustment tank to adjust the pH value. The adjusted solution is then fed into the buffer tank and pumped into the acid precipitation reactor for acid precipitation. The device features a compact structure and a high degree of automation, significantly improving the subsequent acid precipitation reaction rate and ensuring stable purity and quality of the molybdenum trioxide precipitate. Attached Figure Description

[0017] Fig. 1 This is a schematic diagram of the main structure of an ammonia immersion and acid precipitation apparatus for preparing high-purity molybdenum trioxide, as described in this utility model.

[0018] Fig. 2 This is a partially enlarged structural diagram of the purification tank described in this utility model.

[0019] Fig. 3 This is a partially enlarged structural diagram of the pH adjusting tank described in this utility model.

[0020] In the diagram: 1. Ammonia leaching reactor; 2. Acid precipitation reactor; 3. Primary filter assembly; 4. Purification tank; 5. Secondary purification assembly; 6. pH adjustment tank; 7. Buffer tank; 8. Slurry pump; 9. Booster pump; 10. Pumping assembly; 401. Drive assembly; 402. Stirring shaft; 403. Double-layer turbine impeller; 404. Reagent storage chamber; 405. Dosing pump; 406. Injection pipe; 407. Flow meter; 408. Electromagnetic flow valve; 601. Rotary drive component; 602. Fixed shaft; 603. Stirring blade; 604. pH sensor; 605. Reagent chamber; 606. Dropper; 607. Regulating valve; 608. Lead screw module; 609. Moving seat; 610. Push rod; 611. Rubber piston. Detailed Implementation

[0021] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0022] Example: Refer to the appendix of the instruction manual Figs. 1-3As can be seen, this application specifically designs an ammonia leaching and acid precipitation equipment for the preparation of high-purity molybdenum trioxide, including an ammonia leaching reactor 1 and an acid precipitation reactor 2. A purification and adjustment mechanism is provided between the ammonia leaching reactor 1 and the acid precipitation reactor 2. The purification and adjustment mechanism includes a primary filter assembly 3, a purification tank 4, a secondary purification assembly 5, a pH adjustment tank 6, and a buffer tank 7. The feed end of the primary filter assembly 3 is connected to the outlet of the ammonia leaching reactor 1 through a slurry pump 8, and the liquid outlet end of the primary filter assembly 3 is connected to the inlet of the purification tank 4. The liquid inlet end of the secondary purification assembly 5 is connected to the outlet end of the purification tank 4 through a booster pump 9. The inlet end of the pH adjustment tank 6 is connected to the outlet end of the secondary purification assembly 5. The buffer tank 7 is located below the pH adjustment tank 6 and is connected to the lower outlet of the pH adjustment tank 6. The outlet end of the buffer tank 7 is connected to the acid precipitation reactor 2 through a pumping assembly 10. The ammonia leaching reactor 1 reacts with the acid precipitation reactor 2. Between reactors 2, a purification and adjustment mechanism is added. This mechanism includes a primary filter assembly 3, a purification tank 4, a secondary purification assembly 5, a pH adjustment tank 6, and a buffer tank 7. This mechanism enables automated transfer of the reaction solution and, during the transfer process, deep purification and pH adjustment of the reaction solution. The primary filter assembly 3 separates the filter residue from the ammonia leaching solution exported from reactor 1. The filtered reaction solution then enters the purification tank 4 for deep purification, where it works in conjunction with the secondary filter assembly to separate the reaction precipitate. The clean ammonium molybdate solution after separation further enters the pH adjustment tank 6 to adjust the pH value of the ammonium molybdate solution. The adjusted solution is then fed into the buffer tank 7 and, via the pump assembly 10, into the acid precipitation reactor 2 for acid precipitation treatment. The mechanism is compact, highly automated, and can significantly improve the subsequent acid precipitation reaction rate, ensuring the stable purity and quality of the molybdenum trioxide precipitate.

[0023] In a preferred embodiment, the top of the purification tank 4 is equipped with a drive assembly 401. The output end of the drive assembly 401 is connected to a stirring shaft 402, and a double-layer turbine-type stirring paddle 403 is mounted on the stirring shaft 402. A purification agent dosing assembly is located on one side of the drive assembly 401. The purification agent dosing assembly includes a drug storage chamber 404, a drug delivery pump 405, a drug injection pipe 406, a flow meter 407, and an electromagnetic flow valve 408. The inlet end of the drug delivery pump 405 is connected to the drug storage chamber 404. One end of the drug injection pipe 406 extends into the purification tank 4, and the other end is connected to the outlet end of the drug delivery pump 405. The flow meter 407 and the electromagnetic flow valve 408 are both mounted on the drug injection pipe 406. In use, the drive assembly 401 is used to control the stirring shaft 402. The reaction solution is stirred by controlling the rotation of the double-layer turbine impeller 403. At the same time, the drug delivery pump 405 is started, and the purifying agent solution in the drug storage chamber 404 is added to the purification chamber through the drug injection pipe 406. The dosage is monitored by the electromagnetic flowmeter 407. Impurities (such as Cu²⁺ and Fe³⁺) in the filtrate are removed by ion exchange. The purifying agent is preferably ammonium sulfide solution. The addition of ammonium sulfide ((NH₄)₂S) causes Cu²⁺ to form CuS precipitate and Fe³⁺ to form ferrous sulfide (FeS) precipitate. The reaction precipitates are filtered and separated by the secondary purification component 5, thereby effectively improving the purity of the ammonium molybdate solution after ammonia leaching. The drug delivery flow rate is controlled by the electromagnetic flow valve 408 to ensure uniform drug delivery.

[0024] In a preferred embodiment, the pH adjusting tank 6 is equipped with a rotary drive component 601 at its top. A fixed shaft 602 is mounted on the output end of the rotary drive component 601, and a stirring paddle 603 is mounted on the fixed shaft 602. A pH sensor 604 is installed inside the pH adjusting tank 6. Two sets of reagent adding components are installed at the top of the pH adjusting tank 6. Each reagent adding component includes a reagent chamber 605, a adding tube 606, a regulating valve 607, and a adding control component. The lower end of the adding tube 606 extends into the pH adjusting tank 6 and the upper end... The end of the tube is connected to the reagent chamber 605. A regulating valve 607 is located on the dropper 606. The dropper control component is located at the top of the reagent chamber 605, with one end extending into the chamber. The dropper control component includes a lead screw module 608, a moving seat 609, a push rod 610, and a rubber piston 611. The lead screw module 608 is located at the top of the reagent chamber 605. The moving seat 609 is mounted on the moving end of the lead screw module 608. The upper end of the push rod 610 is connected to the moving seat 609, and its lower end extends into the reagent chamber 605. The rubber piston 611 is located at... The rubber piston 611 is fixedly connected to the push rod 610 within the reagent chamber 605 and slides and seals against the inner wall of the reagent chamber 605. During use, acidic and alkaline solutions are poured into different reagent chambers 605 respectively, and the pH value of the solution in the pH adjustment tank 6 is monitored in real time using the pH sensor 604 to determine which reagent solution to add. Specifically, the position of the push rod 610 is adjusted by controlling the lead screw module 608. As the push rod 610 moves downward, it pushes the rubber piston 611 downward, thereby... The acidic or alkaline solution in reagent chamber 605 is added to pH adjustment tank 6 through dropper 606. The flow rate of the reagent solution is regulated and controlled by regulating valve 607. At the same time, pH adjustment tank 6 controls the rotation of fixed shaft 602 and stirring paddle 603 through rotary drive component 601. Stirring can achieve thorough mixing of acid (nitric acid) or alkaline (ammonia) solution with ammonium molybdate solution, avoid drastic local pH fluctuations, ensure uniform reaction, and effectively shorten reaction time and accelerate reaction rate, adjusting the pH solution to 2-3.

[0025] In the specific implementation process, as a preferred setting, the above-mentioned primary filtration component 3 is a filter press or a centrifuge. After the ammonia leaching liquid is filtered or centrifuged, the filter residue (such as unreacted MoS2 and SiO2) is separated out to obtain the filtrate (ammonium molybdate solution containing some impurities).

[0026] In the specific implementation process, as a preferred setting, the above-mentioned secondary purification component 5 is a cartridge filter, microporous filter or ceramic filter, which performs solid-liquid separation on the precipitate in the product of the purification tank 4.

[0027] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A raw material ammonia leaching and acid precipitation device for preparing high-purity molybdenum trioxide, comprising an ammonia leaching reactor and an acid precipitation reactor, characterized in that, The purification adjusting mechanism is arranged between the ammonia leaching reactor and the acid precipitation reactor. The purification adjusting mechanism comprises a primary filtration assembly, a purification tank, a secondary purification assembly, a pH adjusting tank and a buffer tank, the feed end of the primary filtration assembly is connected with the outlet of the ammonia leaching reactor through a slurry pump, the liquid outlet end of the primary filtration assembly is connected with the inlet of the purification tank, the liquid inlet end of the secondary purification assembly is connected with the outlet end of the purification tank through a booster pump, the liquid outlet end of the secondary purification assembly is connected with the inlet end of the pH adjusting tank, the buffer tank is arranged below the pH adjusting tank and is connected with the lower end outlet of the pH adjusting tank, and the outlet end of the buffer tank is connected with the acid precipitation reactor through a pumping assembly.

2. The high-purity molybdenum trioxide production raw material ammonia leaching and acid precipitation equipment according to claim 1, characterized in that, A driving assembly is arranged on the top of the purification tank, a stirring shaft is connected with the output end of the driving assembly, and a double-layer turbine stirring paddle is installed on the stirring shaft.

3. The apparatus for preparing a raw material for high-purity molybdenum trioxide by ammonia leaching and acid precipitation according to claim 2, characterized in that, The purification agent adding assembly comprises a medicament storage bin, a dosing pump, a dosing pipe, a flow meter and an electromagnetic flow valve, the inlet end of the dosing pump is connected with the medicament storage bin, one end of the dosing pipe is inserted into the purification tank and the other end is connected with the outlet end of the dosing pump, and the flow meter and the electromagnetic flow valve are arranged on the dosing pipe.

4. The apparatus for preparing a raw material for high-purity molybdenum trioxide by ammonia leaching and acid precipitation according to claim 1, characterized in that, A rotary driving member is arranged on the top of the pH adjusting tank, a fixed shaft is installed on the output end of the rotary driving member, and a stirring paddle plate is arranged on the fixed shaft.

5. The ammonia leaching and acid precipitation equipment for preparing high-purity molybdenum trioxide according to claim 4, characterized in that, The reagent dropping assembly comprises a reagent bin, a dropping pipe, an adjusting valve and a dropping control member, the lower end of the dropping pipe is inserted into the pH adjusting tank and the upper end is connected with the reagent bin, the adjusting valve is arranged on the dropping pipe, and the dropping control member is arranged on the top of the reagent bin and one end is inserted into the reagent bin.

6. The ammonia leaching and acid precipitation equipment for preparing high-purity molybdenum trioxide according to claim 5, characterized in that, The dropping control member comprises a lead screw module, a moving seat, a push rod and a rubber piston, the lead screw module is arranged on the top of the reagent bin, the moving seat is installed on the moving end of the lead screw module, the upper end of the push rod is connected with the moving seat and the lower end is inserted into the reagent bin, the rubber piston is arranged in the reagent bin and is in sliding sealing with the inner side wall of the reagent bin, and the top of the rubber piston is fixedly connected with the push rod.

7. The apparatus for preparing a raw material for high-purity molybdenum trioxide by ammonia leaching and acid precipitation according to claim 1, characterized in that, The primary filtration assembly is a filter press or a centrifugal separator.

8. The high-purity molybdenum trioxide production raw material ammonia leaching and acid precipitation equipment according to claim 1, characterized in that, The secondary purification assembly is a filter core filter, a microporous filter or a ceramic filter.

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