Method and device for efficiently purifying and filtering non-ferrous metal hydrometallurgy solution

Abstract

The invention discloses a method for efficiently purifying and filtering a non-ferrous metal hydrometallurgy solution, and relates to the technical field of non-ferrous metal metallurgy, and the method is as follows: in a closed filter, slag in the solution forms a filter membrane on a filter blade, and meanwhile, driving pressure is increased, so that efficient purification and filtration are realized. The method is high in filtering efficiency, energy consumption is reduced, waste gas is not generated in the process, and compared with a traditional smelting solution filtering mode, the method has the advantages of being free of waste filter cloth, environmentally friendly, high in intelligent degree, small in occupied area and the like; filtering equipment with different flows and intelligent control can be designed according to production requirements, the solution purification reaction temperature is not changed, and the reaction is stable.

Description

Technical Field

[0001] The present invention relates to the technical field of non-ferrous metal smelting, and particularly relates to a method and device for efficient purification and filtration of non-ferrous metal hydrometallurgical solutions. Background Art

[0002] In the process of non-ferrous metal hydrometallurgy, the traditional method of liquid-solid separation is to use a filter press. However, the filter press has disadvantages such as slow filtration speed, long processing cycle, high moisture content of the filter cake after filtration, insufficient clarity of the filtrate, easy blockage of the filter plate, fast wear of components, etc. In addition, the filter press has disadvantages such as high energy consumption for pressing and large equipment investment. The most important thing is that there are high-temperature and highly polluted waste gases escaping during the pressing process, resulting in very poor working conditions, a harsh operating environment for personnel, frequent replacement of filter cloth, and difficulty in recycling used filter cloth, resulting in high production costs.

[0003] Therefore, providing a method for efficient purification and filtration of non-ferrous metal hydrometallurgical solutions is a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0004] To solve the above technical problems, the present invention provides a method and device for efficient purification and filtration of non-ferrous metal hydrometallurgical solutions. The method and device of the present invention have high filtration efficiency, energy conservation, no waste gas generation during the process, and have advantages such as no generation of waste filter cloth, environmental protection, high intelligence, and small floor area compared with the traditional filtration method of smelting solutions.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A method for efficient purification and filtration of non-ferrous metal hydrometallurgical solutions, the method being to form a filter membrane on the filter blades through the slag in the solution in a closed filter, and at the same time increase the driving pressure to achieve efficient purification and filtration.

[0007] The present invention passes a non-ferrous metallurgical pulp solution containing purification reaction slag through the particles of the solution slag on the closed filter blades to form a layer of film, achieving the effect of self-purification and filtration of the solution. At the same time, the driving pressure is gradually increased, and the solution filtration pressure shows a linear increase in the closed chamber, up to 0.6 Mpa at most. At the same time, the impurity removal and purification reaction is strengthened in the closed chamber to achieve the purpose of self-filtration and purification.

[0008] Preferably, the filter blades are composed of multiple layers of corrosion-resistant metal meshes.

[0009] Preferably, the corrosion-resistant metal mesh is a 400 - 800 mesh stainless steel 316L metal mesh.

[0010] Preferably, the driving pressure is provided by a centrifugal pump.

[0011] An apparatus for efficient purification and filtration of non-ferrous metal hydrometallurgical solutions, the apparatus comprising at least one filtration unit;

[0012] The filtration unit includes a sealed chamber, a filtration blade is provided in the sealed chamber, an outlet liquid main pipe is connected to the outlet liquid pipe of the filtration blade, and an inlet liquid pipe is arranged below the outlet liquid main pipe.

[0013] In the present invention, by arranging the inlet liquid pipe below the outlet liquid main pipe, an initial solution can uniformly form a filter layer from bottom to top during the filtration process, achieving a better filtration effect. At the same time, no slag accumulates at the bottom, which does not affect slag discharge. When the sealed tank reaches a set pressure, the lower inlet is closed, and then the solution of the leaf filter press will continue to be filtered for a certain period of time, which can reduce the waste of solution caused during slag discharge.

[0014] Preferably, the sealed chamber is further provided with a slag removal structure. The slag removal structure includes a positioning device arranged below the filtration blade. The positioning device includes a support spring and a limit, and a fixing device arranged above the filtration blade. The fixing device is connected to the filtration blade through a fixing spring, and the fixing device is connected to a mechanical device.

[0015] In the present invention, the slag removal effect of the blade is realized by transmitting external mechanical vibration to each filtration blade.

[0016] Preferably, a flushing structure is further provided at the top of the sealed chamber. The flushing structure includes a high-pressure flushing nozzle device arranged above between the filtration blades, which automatically flushes after slag discharge.

[0017] Preferably, a slag discharge structure is further provided at the bottom of the sealed chamber. The slag discharge structure includes a discharge device arranged at the bottom of the sealed chamber. The discharge device includes a spiral blade conveying structure and a discharge pipe.

[0018] Preferably, the discharge pipe is arranged in the middle of the bottom of the sealed chamber, and a switch valve is provided on the discharge pipe.

[0019] In the present invention, the slag on the filtration blade falls to the bottom of the chamber by its own weight and vibration, and then is discharged to the outlet by the spiral blade. The outlet pipe and the switch valve are arranged in the middle of the bottom of the sealed chamber. After slag discharge, the upper high-pressure nozzle is used for cleaning. The cleaning water and the bottom slag are discharged from the chamber together, and then the switch valve is closed for re-operation.

[0020] When the filtration time is greater than 2 h, according to the pressure in the sealed chamber, the inlet liquid valve is closed to realize functions such as automatic liquid discharge, slag discharge, and cleaning.

[0021] Preferably, the filtration blades are arranged vertically and parallel to each other.

[0022] Preferably, the main liquid outlet pipe is provided with a visualization window and an automatic detection sampling port, which are switched according to the solution quality, and the qualified solution enters the subsequent smelting process for use.

[0023] Preferably, an overflow pipe is further provided at the top of the sealed bin.

[0024] Preferably, a pressure gauge interface is further provided at the top of the sealed bin for connecting with a pressure gauge.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The method of the present invention has high filtration efficiency, energy consumption saving, no waste gas generated during the process, and has the advantages of no waste filter cloth, environmental protection, high intelligence, small floor area, etc. compared with the traditional smelting solution filtration method; the filtration equipment with different flow rates and intelligent control can be designed according to production requirements, the reaction temperature of solution purification does not change, and the reaction is stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. The drawings in this description are only the embodiments of the present invention.

[0028] Figure 1 It is a structural diagram of a high-efficiency purification and filtration device for non-ferrous metal hydrometallurgical solution of the present invention;

[0029] Figure 2 It is a structural diagram of the slag removal structure in a high-efficiency purification and filtration device for non-ferrous metal hydrometallurgical solution of the present invention;

[0030] Figure 3 It is a comparison diagram of the products of a high-efficiency purification and filtration device for non-ferrous metal hydrometallurgical solution of the present invention and the products of the traditional device. DETAILED DESCRIPTION OF THE INVENTION

[0031] The following describes the embodiments of the present invention. The examples of the embodiments are shown in the drawings. The embodiments described with reference to the drawings are exemplary and are intended to explain the present invention, rather than to be construed as a limitation of the present invention.

[0032] Such as Figure 1-2 The present invention provides a device for high-efficiency purification and filtration of non-ferrous metal hydrometallurgical solution, including at least one filtration unit;

[0033] The filtration unit includes a sealed bin 1. A filtration blade 5 is arranged in the sealed bin 1. The main liquid outlet pipe 6 is connected to the liquid outlet pipe 11 of the filtration blade 5. Three liquid inlet pipes 7 are provided, all at the bottom of the sealed bin 1 and below the main liquid outlet pipe 6;

[0034] Furthermore, the sealed bin 1 is also provided with a slag removal structure. The slag removal structure includes a positioning device 8 arranged below the filter blades 5. The positioning device 8 includes a support spring and a limit, and a fixing device 2 arranged above the filter blades 5. The fixing device 2 is connected to the filter blades 5 through a fixing spring, and the fixing device 2 is connected to the mechanical device;

[0035] Furthermore, a flushing structure is also arranged at the top of the sealed bin 1. The flushing structure includes a high-pressure flushing nozzle device 3 arranged above the filter blades 5. The high-pressure flushing nozzle device 3 is arranged on the fixing device 2 and automatically flushes after slag discharge;

[0036] Furthermore, a slag discharge structure is also arranged at the bottom of the sealed bin 1. The specific structure of the slag discharge structure is as follows: The slag discharge structure includes a discharge device arranged at the bottom of the sealed bin 1. The discharge device includes a spiral blade conveying structure 4 and a discharge pipe 13. The discharge pipe 13 is arranged in the middle of the bottom of the sealed bin 1, and a liquid discharge pipe 12 is arranged on the discharge pipe 13;

[0037] Furthermore, the filter blades 5 are arranged vertically and parallel to each other;

[0038] Furthermore, a visualization window and an automatic detection sampling port are arranged on the main liquid outlet pipe 6 and are switched according to the solution quality. The qualified solution enters the subsequent smelting process for use;

[0039] Furthermore, an overflow pipe 9 is also arranged at the top of the sealed bin 1;

[0040] Furthermore, a pressure gauge interface 10 is also arranged at the top of the sealed bin 1 for connecting with a pressure gauge.

[0041] Embodiment 1

[0042] Adopt the device as Figure 1-2 described to carry out a method for efficient purification and filtration of a non-ferrous metal hydrometallurgy solution, which specifically includes the following steps:

[0043] (1) During the purification of the non-ferrous metal hydrometallurgy solution, first add metallic zinc powder and an activator or other purification agents to carry out a deep impurity removal reaction in the solution; then pump the solution quickly from the bottom inlet pipe into the sealed high-efficiency filtration device. Large particles formed in the solution will quickly form a layer of film from the bottom of the filter blades upwards, which itself has a filtering effect, and at the same time reacts with unreacted impurity elements such as cadmium, cobalt, and iron in the solution, playing a role in strengthening purification;

[0044] (2) During the period when the solution forms a filter membrane on the filter leaves, when it cannot fully reach the qualified liquid, samples are taken through the automatic detection sampling ports of the filter liquid pipelines of each leaf outside the bin for monitoring. When the pressure in the bin reaches 0.3 MPa and runs for 3 minutes, the solution can reach a 100% qualification rate; if it is found that the solution in individual outlet pipes is unqualified, there should be a fault of damage and leakage in the corresponding filter leaves. Just close the outlet valve of this pipeline, which will not affect the operation of other filter units;

[0045] (3) Discharging slag and cleaning: After the pressure reaches 0.6 Mpa and is maintained for 15 minutes, the flow rate of the main outlet pipe significantly decreases. Automatically close the pump and the inlet valve, open the bottom drain valve, slowly drain the liquid in the bin while playing a role in pressure relief. Then, open the slag discharge switch valve of the bottom discharge pipeline, start the bin vibration device, and the bottom spiral blade enters the working state. Vibration for 10 s is a cycle, with an interval of 10 s. After 3 cycles, the high-pressure flushing water starts to achieve automatic flushing. Generally, it flushes for 20 s, and then close the valve to enter the next cycle of operation;

[0046] (4) Soaking and inspection: After long-term operation, the filter screens of the filter leaves will be blocked and must be soaked in acidic liquid to restore the filtering effect. The soaked liquid returns to the wet process system without waste, and the filter units where the solution is found to be unqualified during the corresponding filtering process are inspected, repaired, or replaced for the leaves.

[0047] Select a zinc smelting company's purification section of zinc sulfate solution for industrial experiments. Temperature: <80 °C, working pressure: ≤0.4 MPa, filtration accuracy: 600 mesh, treatment capacity: 60 m 3 / h. The comparison chart of the treated outlet liquid and the products of the original purification box - type filter press process method is as Figure 3 , where 1 in the figure is the solution obtained by the traditional purification filter - press method, and 2 is the solution obtained by the method of the present invention. It can be seen from the figure that the solution obtained by the traditional purification filter - press method is turbid and has small particles, while the method of the present invention does not. Therefore, the high - efficiency purification and filtration method of the solution of the present invention has a better effect than the traditional purification filter - press method;

[0048] The following table 1 shows the comparison results of the indexes of germanium, cobalt, cadmium, and iron detected in the solution purified by the method of the present invention and the original purification box - type filter press process method. It can be seen from the table that the indexes of the liquid after high - efficiency purification and filtration of the wet - process smelting solution are better than those of the traditional plate - and - frame filter press method. There is no exhausted steam generated during the process, the environment is optimized, and the heat energy loss is reduced. Compared with the traditional process, the steam consumption will be greatly reduced.

[0049] Table 1 Index detection results

[0050] Item PH Zng / L Gemg / L Comg / L Cdmg / L Femg / L Traditional method 4.8 149 0.046 0.35 0.26 13 Efficient purification and filtration method 4.8 149 0.033 0.32 0.16 10

[0051] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for efficient purification and filtration of non-ferrous metal hydrometallurgical solutions, characterized in that: The method is to form a filter membrane on a filter blade in a closed filter through residue in a solution, and simultaneously increase the driving pressure to achieve high-efficiency purification and filtration.

2. The method for efficient purification and filtration of non-ferrous metal hydrometallurgical solution according to claim 1, characterized in that: The filtering blades are made of multi-layer corrosion-resistant metal mesh.

3. The method for efficient purification and filtration of non-ferrous metal hydrometallurgical solution according to claim 2, characterized in that: The corrosion-resistant metal mesh is a 400-800 mesh stainless steel 316L metal mesh.

4. The method for efficient purification and filtration of non-ferrous metal hydrometallurgical solution according to claim 1, characterized in that: The driving pressure is provided by a centrifugal pump.

5. A device for efficient purification and filtration of non-ferrous metal hydrometallurgical solutions, characterized in that: The device comprises at least one filtering unit; The filter unit comprises a sealed chamber, in which filter blades are arranged, a liquid outlet main pipe is connected to the liquid outlet pipes of the filter blades, and a liquid inlet pipe is arranged below the liquid outlet main pipe.

6. The device for efficient purification and filtration of non-ferrous metal hydrometallurgical solution according to claim 5, characterized in that: The closed bin is also provided with a slag removal structure, which includes a positioning device arranged at the lower part of the filter blade, the positioning device includes a supporting spring and a limit, and includes a fixing device arranged at the upper part of the filter blade, the fixing device is connected to the filter blade through a fixing spring, and the fixing device is connected to a mechanical device.

7. The device for efficient purification and filtration of non-ferrous metal hydrometallurgical solution according to claim 5, characterized in that: The top of the closed bin is also provided with a flushing structure, and the flushing structure comprises a high-pressure flushing nozzle device arranged at the upper part between the filtering blades.

8. The device for efficient purification and filtration of non-ferrous metal hydrometallurgical solution according to claim 5, characterized in that: The bottom of the closed bin is also provided with a slag discharge structure, which includes a discharge device arranged at the bottom of the closed bin, and the discharge device includes a spiral blade conveying structure and a discharge pipeline.

9. The device for efficient purification and filtration of non-ferrous metal hydrometallurgical solution according to claim 5, characterized in that: The filtering blades are arranged vertically and in parallel.

10. The device for efficient purification and filtration of non-ferrous metal hydrometallurgical solution according to claim 5, characterized in that: The liquid outlet main pipe is provided with a visualization window and an automatic detection sampling port.

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