A kind of front reversible pressure autoclave

Abstract

The present invention discloses a pre-reversible pressure autoclave, which relates to the technical field of metallurgical pressure leaching, and comprises an autoclave body, wherein the autoclave body is provided with a plurality of partitions for dividing the autoclave body into a plurality of reaction chambers, the upper parts of adjacent reaction chambers are connected, and each reaction chamber is provided with a vertically inserted stirring device, wherein the stirring device comprises a driving element installed outside the autoclave body, a stirring shaft installed at the output end of the driving element, and a stirring paddle installed at the bottom end of the stirring shaft; the partition between the first reaction chamber and the second reaction chamber is provided with a connecting port for reflux at the bottom position, and the autoclave body is provided with a sealed oxygen gun at the bottom position corresponding to each reaction chamber. The present invention has the advantages of improving reaction efficiency and reducing energy consumption.

Description

Technical Field

[0001] The invention relates to the technical field of metallurgical pressure leaching, in particular to a front reversible pressure autoclave. Background Art

[0002] In metallurgical hydrometallurgy technology, extracting valuable metals from slurry through the leaching process is a key core technology. Pressure autoclaves have gradually been used to increase the leaching temperature, speed up the leaching rate, and improve the leaching rate. However, in the continuous leaching reaction process of the horizontal pressure autoclave, such as a pressure autoclave with publication number CN212270200U and publication date 2021.01.01, since the initial feed of the first cell is cold slurry, a huge temperature difference is formed with the rear cell. In order to balance the temperature as much as possible, a large amount of oxygen needs to be introduced into the first cell to accelerate the reaction, and the heat generated by the reaction is used to increase the equilibrium temperature. This causes the rear cell to no longer be able to carry out oxygenation reaction according to the continuous reaction requirements of the process. This project studies and invents a pre-reversible reaction chamber to solve the large temperature difference between the first and second cells of the horizontal pressure autoclave and the uneven oxygen consumption, which affects the continuous leaching reaction efficiency and oxygen energy consumption. Summary of the invention

[0003] In order to overcome the shortcomings of the background technology, the present invention provides a pre-reversible pressure reactor which improves reaction efficiency and reduces energy consumption.

[0004] The technical solution adopted by the present invention is: a front reversible pressure kettle, which includes a kettle body, wherein the kettle body is provided with a plurality of partitions for dividing the kettle body into a plurality of reaction chambers, the upper parts of adjacent reaction chambers are connected, and each reaction chamber is provided with a vertically inserted stirring device, the stirring device includes a driving element installed outside the kettle body, a stirring shaft installed at the output end of the driving element, and a stirring paddle installed at the bottom end of the stirring shaft; the partition between the first reaction chamber and the second reaction chamber is provided with a connecting port for reflux at the bottom position, and the kettle body is provided with a sealed oxygen gun at the bottom position corresponding to each reaction chamber.

[0005] The connecting port is arc-shaped and its cross-sectional dimension is 0.03-0.05 of the cross-sectional dimension of the partition.

[0006] The height of the partition between the second reaction chamber and the third reaction chamber is 5%-8% higher than that of other partitions.

[0007] The stirring paddle in the second reaction chamber adopts a bottom suction upward flipping stirring paddle, and its outer diameter size is 0.25-0.4D, and its structure includes:

[0008] A hub, which is fixedly mounted on the bottom end of the stirring shaft;

[0009] A plurality of blades fixedly mounted on the circumference of the hub;

[0010] A guide cylinder, which is fixedly mounted on the lower end of the hub and is coaxially arranged with the hub;

[0011] The diameter of the guide tube gradually decreases from bottom to top;

[0012] Wherein, D is the height of the reaction chamber.

[0013] The stirring paddles in the first reaction chamber and the third reaction chamber are disk-type stirring paddles, and their outer diameters are 0.28-0.4D.

[0014] The stirring paddles in the fourth and subsequent reaction chambers all adopt variable-section propellers, and their outer diameters are 0.25-0.45D.

[0015] The oxygen lance is located directly below the stirring paddle and the distance between the two is 1 / 4-1 / 6D.

[0016] The working pressure in the kettle is 0-4MPa; the working temperature is 20-300°C.

[0017] The beneficial effect of the present invention is that the materials in the first reaction chamber and the second reaction chamber in the technical solution will be partially refluxed according to the temperature difference of the materials, that is, the materials coming from the first reaction chamber will not completely follow the process of going down step by step, but the materials from the first reaction chamber to the second reaction chamber will partially reflux to the first reaction chamber, and the temperature difference between the first reaction chamber and the second reaction chamber is used to adjust the temperature of the initial cold slurry in the first reaction chamber, avoiding excessive oxygenation in the first reaction chamber to intensify the reaction in order to increase the temperature of the first reaction chamber, and using the heat generated by the reaction to increase the temperature of the first reaction chamber, which has the advantages of improving reaction efficiency and reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the front reversible pressure autoclave according to an embodiment of the present invention.

[0019] Figure 2 Schematic diagram of the structure of the partition between the first reaction chamber and the second reaction chamber.

[0020] Figure 3 This is a schematic diagram of the structure of a bottom-suction, upturned agitator.

[0021] Figure 4 It is a schematic diagram of the structure of a disc-type stirring paddle.

[0022] Figure 5 This is a schematic diagram of the structure of a variable-section propeller. DETAILED DESCRIPTION

[0023] The embodiments of the present invention are further described below in conjunction with the accompanying drawings:

[0024] As shown in the figure, a pre-reversible pressure autoclave comprises an autoclave body 1, wherein the autoclave body 1 is provided with a plurality of partitions 2 for dividing the autoclave body 1 into a plurality of reaction chambers, the upper parts of adjacent reaction chambers are connected, and a vertically inserted stirring device is provided in each reaction chamber, wherein the stirring device comprises a driving element 3 installed outside the autoclave body 1, a stirring shaft 4 installed at the output end of the driving element 3, and a stirring paddle installed at the bottom end of the stirring shaft 4; the partition 2 between the first reaction chamber and the second reaction chamber is provided with a connecting port 6 for reflux at the bottom position, and the autoclave body 1 is provided with a sealed oxygen gun 7 at the bottom position corresponding to each reaction chamber; The materials in the first reaction chamber and the second reaction chamber in the technical solution will be partially refluxed according to the temperature difference of the materials, that is, the materials coming into the first reaction chamber will not completely follow the process of going down step by step, but part of the materials from the first reaction chamber to the second reaction chamber will be refluxed to the first reaction chamber, and the temperature difference between the first reaction chamber and the second reaction chamber is used to adjust the temperature of the initial cold slurry in the first reaction chamber, avoiding excessive oxygenation in the first reaction chamber to intensify the reaction in order to increase the temperature of the first reaction chamber, and using the heat generated by the reaction to increase the temperature of the first reaction chamber, which has the advantages of improving reaction efficiency and reducing energy consumption.

[0025] The communication port 6 is arc-shaped and its cross-sectional dimension is 0.03-0.05 of the cross-sectional dimension of the partition plate 2 .

[0026] The height of the partition 2 between the second reaction chamber and the third reaction chamber is 5%-8% higher than that of other partitions 2, so as to ensure that the materials in the first reaction chamber and the second reaction chamber react fully without short circuit.

[0027] The stirring paddle in the second reaction chamber adopts a bottom suction upward turning stirring paddle 5, which plays the role of bottom material extraction and upper material return, and its outer diameter size is 0.25-0.4D, and its structure includes:

[0028] A hub 51, which is fixedly mounted on the bottom end of the stirring shaft 4;

[0029] A plurality of blades 52 are fixedly mounted on the circumference of the hub 51, and the structure thereof is shown in the figure, and can generate an upward spiral when rotating;

[0030] A guide cylinder 53, which is fixedly mounted on the lower end of the hub 51 and is coaxially arranged with the hub 51;

[0031] The diameter of the guide tube 53 gradually decreases from bottom to top;

[0032] Wherein, D is the height dimension of the reaction chamber; the stirring paddle in the second reaction chamber, through the action of the upward spiral and the guide tube, will produce different displacement pumping capacities at different rotation speeds, the main purpose of which is to make part of the slurry in the second reaction chamber flow back to the first reaction chamber.

[0033] The stirring paddles in the first reaction chamber and the third reaction chamber adopt disc-type stirring paddles 8, and their outer diameter size is 0.28-0.4D. The structure of the disc-type stirring paddle is shown in the figure. The disc is fixedly installed at the bottom of the stirring shaft, and multiple square blades are installed on the circumference of the disc, and the square blades are all installed vertically; due to the effect of the disc, the gas of the disc-type stirring paddle can generate two circulation flows of vortex and attached cavitation near the upper and lower blades of the disc, and the dispersion is stable and uniform with large shear force. The main purpose is to fully disperse and absorb the three phases of gas, solid and liquid.

[0034] The stirring paddles in the fourth and subsequent reaction chambers all adopt variable-section propellers 9, and their outer diameter size is 0.25-0.45D; the blade cross-section gradually decreases from the center to the circumference and the blades are installed at an angle. When the variable-section stirring paddle rotates at high speed, it is in a turbulent dispersion state. The larger blade inclination angle and blade twisting degree can enable the stirring paddle to achieve a higher flow field and discharge volume. The main purpose is solid suspension, mass transfer and reaction.

[0035] The oxygen lance 7 is located directly below the stirring paddle and the distance between the two is 1 / 4-1 / 6D. After testing, the oxygen reaction effect at this distance is the best.

[0036] The working pressure in the kettle body 1 is 0-4 MPa; the working temperature is 20-300° C. After many tests, the leaching reaction efficiency is the best in this working environment.

[0037] In the description of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0039] Technical personnel should note that: Although the present invention has been described according to the above specific implementation methods, the inventive concept of the present invention is not limited to this invention, and any modification using the inventive concept will be included in the scope of protection of this patent.

Claims

1. A front reversible pressure autoclave, comprising an autoclave body (1), wherein the autoclave body (1) is provided with a plurality of partitions (2) for dividing the autoclave body (1) into a plurality of reaction chambers, the upper parts of adjacent reaction chambers being connected, and each reaction chamber being provided with a vertically inserted stirring device, wherein the stirring device comprises a driving element (3) mounted outside the autoclave body (1), a stirring shaft (4) mounted at the output end of the driving element (3), and a stirring paddle mounted at the bottom end of the stirring shaft (4); characterized in that: The partition (2) between the first reaction chamber and the second reaction chamber is provided with a connecting port (6) for reflux at the bottom position, the kettle body (1) is provided with a sealed oxygen gun (7) at the bottom position corresponding to each reaction chamber, the height of the partition (2) between the second reaction chamber and the third reaction chamber is 5%-8% higher than that of the other partitions (2); the stirring paddle in the second reaction chamber adopts a bottom suction upward flipping type stirring paddle (5).

2. The pre-reversible pressure autoclave according to claim 1, characterized in that: The communication port (6) is arc-shaped and its cross-sectional dimension is 0.03-0.05 of the cross-sectional dimension of the partition plate (2).

3. The pre-reversible pressure autoclave according to claim 1, characterized in that: The bottom suction upward-turning stirring paddle (5) has an outer diameter of 0.25-0.4D, and its structure includes: A wheel hub (51) fixedly mounted on the bottom end of the stirring shaft (4); A plurality of blades (52) fixedly mounted in the circumference of the hub (51); A guide cylinder (53) fixedly mounted on the lower end of the wheel hub (51) and coaxially arranged with the wheel hub (51); The caliber of the guide tube (53) gradually decreases from bottom to top; wherein D is the height dimension of the reaction chamber.

4. The pre-reversible pressure autoclave according to claim 1, characterized in that: The stirring paddles in the first reaction chamber and the third reaction chamber are disk-type stirring paddles (8), and their outer diameters are 0.28-0.4D.

5. The pre-reversible pressure autoclave according to claim 1, characterized in that: The stirring impellers in the fourth and subsequent reaction chambers all adopt variable-section propellers (9), and their outer diameters are 0.25-0.45D.

6. The pre-reversible pressure autoclave according to claim 1, characterized in that: The oxygen lance (7) is located directly below the stirring paddle and the distance between the two is 1 / 4-1 / 6D.

7. The pre-reversible pressure autoclave according to claim 1, characterized in that: The working pressure in the kettle body (1) is 0-4 MPa; the working temperature is 20-300°C.

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