Filtering method for artificially-constructed filtering layer in hydrometallurgy

Abstract

The invention discloses a filtering method for manually constructing a filtering layer in hydrometallurgy, which comprises the following steps: S1, closing an original liquid outlet valve of a filter press, opening a liquid outlet circulating valve of the filter press, and feeding liquid through a liquid inlet pipeline of the filter press; s2, adding charcoal powder into the filter residue slurrying tank through a charcoal powder adding hole, and fully dissolving the charcoal powder; s3, opening a circulating liquid inlet valve of the filter press, opening a liquid outlet pump of the filter residue slurrying tank, and pumping a solution obtained by mixing the acid-dissolved liquid and the charcoal dust in the tank into the filter press for filter pressing; s4, during circulation, observing the flow rate of the filtrate and the content of charcoal dust in the tank; s5, after circulating for more than 16 hours, emptying the solution in the filter residue slurrying tank; s6, a sampling opening is formed in a filter press post-filtration liquid discharging pipeline, and during circulating oil removal, circulating post-filter-pressing liquid is taken at regular time; and S7, when the oil content of the liquid obtained after circulating filtration of the filter press reaches the standard. The self-circulation filtering process of the filter press is simple in process flow and easy to operate, and has a development prospect and a popularization value.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metallurgy, in particular to a filter method for artificial filter layer in hydrometallurgy. BACKGROUND

[0002] With the development of electro-nickel process technology, the leaching-extraction-electrodeposition method for producing electro-nickel gradually becomes the mainstream process of electro-nickel production. However, due to the influence of extraction process technology, the organic phase is entrained in the aqueous phase during the extraction process, resulting in residual oil (organic matter) in the solution, which will affect the ion diffusion and power line distribution in the cathode liquid, hinder the normal deposition of nickel ions; when the content of oil and organic matter is high, it will also be adsorbed on the cathode to form an insulating point to hinder the power line to pass through, thereby forming pores to affect the quality of electrodeposited nickel product. The oil and organic matter in the electrodeposition cathode liquid also have an impact on the physical appearance quality of electrodeposited nickel, which adversely affects the economic benefit and production cost of enterprises. SUMMARY

[0003] In view of the above technical problems, the present application provides a filter method for artificial filter layer in hydrometallurgy.

[0004] In order to achieve the above purpose, the technical scheme of the present application is as follows: A filter method for artificial filter layer in hydrometallurgy, comprising the following steps: S1, closing the original liquid outlet valve of the filter press, opening the liquid circulation valve of the filter press, and feeding liquid through the liquid inlet pipeline of the filter press; when the liquid level of the filter residue slurry tank reaches the required range, the liquid inlet valve of the filter press is closed; S2, adding charcoal powder to the filter residue slurry tank through the charcoal powder adding hole to make it dissolve sufficiently, and adding 300 kg of activated carbon powder per unit time; S3, opening the circulating liquid inlet valve of the filter press and the filter residue slurry tank liquid outlet pump, and pumping the solution mixed with the acid-soluble liquid and charcoal powder in the tank into the filter press for pressure filtration, and forming a self-circulation system of the filter residue slurry tank and the filter press through the circulating pipeline; S4, during the circulation, observing the flow rate of the filtrate and the content of charcoal powder in the tank, controlling the single cycle time to be more than 16 hours, and initially forming a filter layer of 3-5 mm to ensure the subsequent solution flow and charcoal powder not to be filtered out; S5, after more than 16 hours of circulation, emptying the solution in the filter residue slurry tank, stopping the slurry tank liquid outlet pump, closing the circulating liquid outlet valve, opening the liquid inlet valve of the filter press, and feeding liquid until the liquid level of the filter residue slurry tank reaches the required range, then closing the liquid inlet valve of the filter press, and repeating steps S1-S4 to circulate and remove oil; S6, setting a sampling port on the liquid outlet pipeline of the filter press after filtration, and during the circulation and oil removal, regularly taking the circulating filtered liquid to analyze the oil content and observe the oil removal situation, and if the desired effect is achieved, i.e. the oil content is less than 3 ppm, the circulation time is recorded; S7, when the pressure filter cycle filter liquid oil reaches the standard, and the charcoal powder has no filter phenomenon, it represents that the solution in the filter residue slurry tank can enter the production system, at this time, stop the pressure filter self-circulation, close the pressure filter liquid circulation valve, open the original pressure filter liquid valve, and pour the solution in the filter residue slurry tank into the pressure filter, and the filtered liquid enters the liquid main pipe and enters the production system.

[0005] In the step S2, the particle size of the charcoal powder is between 100-150 μm, and the filter cloth aperture of the pressure filter is between 10-15 μm.

[0006] In the step S2, the particle size of the charcoal powder is between 100-150 μm, and the filter cloth aperture of the pressure filter is between 10-15 μm.

[0007] In the step S2, the particle size of the charcoal powder is between 100-150 μm, and the filter cloth aperture of the pressure filter is between 10-15 μm.

[0008] The beneficial effects of the present application are: 1. The present application realizes a new type of filtering technology for removing impurities and oil from the feed liquid by constructing a pressure filter self-circulation system, and constructing a charcoal powder filter layer, which reduces the content of suspended particles and oil (organic matter) in the electrodeposition cathode liquid, ensures the physical appearance quality of the electrodeposited nickel, and improves the profit of the electrodeposited nickel product.

[0009] 2. Compared with the existing pressure filter filtering process, the present application has higher filtering precision, and can effectively remove suspended particles and oil (organic matter) in the solution.

[0010] 3. The present application proposes a new type of filtering technology for wet metallurgy artificial construction filter layer, which has simple operation after industrial test, and has significant competitive advantages in efficiency, cost and electrodeposited nickel product quality for the pressure filter filtering process in the leaching-extraction-electrodeposition production process.

[0011] 4. In the operation process, first, the original pressure filter liquid valve is closed, the circulation valve is opened, the liquid is fed to the filter residue slurry tank to reach the specified liquid level, then the liquid feeding is stopped; the charcoal powder is added to the slurry tank through a special hole, and after sufficient dissolution, the liquid pump is started, the circulation liquid valve is opened, and the self-circulation of the pressure filter and the slurry tank is established; the filter flow rate and the charcoal powder content are required to be monitored in real time, the single cycle time is greater than 16 h, and a charcoal powder filter layer of 3~5 mm can be formed; the oil content is detected from the pressure filter sampling port at regular time, the cycle is continued until the oil content is stable and less than 3 ppm, and the standard time is recorded; after reaching the standard, the cycle is stopped, the circulation valve is closed, and the original liquid pipeline is switched to, so that the qualified solution is transported to the production system. DETAILED DESCRIPTION

[0012] In order to make the objectives, technical solutions, and advantages of the present application clearer and more comprehensible, the present application is further described in detail below with reference to specific embodiments. It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the present application. Furthermore, in the following description, descriptions of well-known structures and techniques are omitted to avoid unnecessarily obscuring the concept of the present application.

[0013] Embodiment 1 A wet metallurgical artificial filter layer construction filtering method, comprising the following steps: S1, closing the original filtrate valve of the filter press, opening the filtrate circulation valve of the filter press, feeding liquid through the filter press liquid inlet pipeline, and closing the filter press liquid inlet valve when the liquid level of the filter residue slurry tank reaches the required range; S2, adding charcoal powder to the filter residue slurry tank through the charcoal powder adding hole to make it dissolve sufficiently, and adding 300 kg of activated carbon powder per unit per time; S3, opening the filter press circulation liquid inlet valve and the filter residue slurry tank liquid outlet pump to pump the solution mixed with the acid-soluble liquid and the charcoal powder in the tank into the filter press for pressure filtration, and forming a self-circulation system of the filter residue slurry tank and the filter press through the circulation pipeline; S4, during the circulation, observing the filter flow rate and the charcoal powder content in the tank, controlling the single circulation time to be more than 16 hours, and initially forming a filter layer of 3 mm to ensure the subsequent solution flow rate and charcoal powder not to be filtered out; S5, after more than 16 hours of circulation, emptying the solution in the filter residue slurry tank, stopping the slurry tank liquid outlet pump, closing the circulation liquid outlet valve, opening the filter press liquid inlet valve, closing the filter press liquid inlet valve when the liquid level of the filter residue slurry tank reaches the required range, and repeating steps S1-S4 to perform the circulation oil removal; S6, setting a sampling port on the filter press filtered liquid outlet pipeline, and taking the filtered liquid of the filter press at regular time intervals during the circulation oil removal, analyzing the oil content, observing the oil removal condition, and recording the circulation time when the desired effect is achieved, i.e., the oil content is less than 3 ppm; S7, when the oil content of the filtered liquid of the filter press meets the standard and the charcoal powder is not filtered out, it means that the solution in the filter residue slurry tank can enter the production system, at this time, stopping the self-circulation of the filter press, closing the filter press liquid circulation valve, opening the original filter press liquid outlet valve, pumping the solution in the filter residue slurry tank into the filter press, and making the filtered liquid enter the liquid outlet main pipe and enter the production system.

[0014] In step S2, the particle size of the charcoal powder is 100 μm, and the pore size of the filter cloth of the filter press is 10 μm.

[0015] Every 12 days, the filter press is opened to perform the cake unloading operation, at this time, the filter cake thickness should be 35 mm, and after disassembly, the circulation is repeated from step S1.

[0016] The filter press used in step S1 is an XAZGFD150 / 1250-UK type automatic box filter press, and all subsequent steps are based on this type of filter press.

[0017] Example 2 A wet metallurgical artificial filter layer construction filtering method, comprising the following steps: S1, close the original liquid outlet valve of the filter press, open the filter press liquid circulation valve, and add liquid through the filter press liquid inlet pipeline. When the liquid level of the filter residue slurry tank reaches the required range, close the filter press liquid inlet valve; S2, add charcoal powder to the filter residue slurry tank through the charcoal powder adding hole to make it dissolve sufficiently, and add 300 kg of activated carbon powder per time; S3, open the filter press circulation liquid inlet valve and the filter residue slurry tank liquid outlet pump, and pump the solution mixed with the acid-soluble liquid and charcoal powder into the filter press for pressure filtration. Through the circulation pipeline, a self-circulation system of the filter residue slurry tank and the filter press is formed; S4, during the circulation, observe the filter flow rate and the charcoal powder content in the tank, control the single cycle time to be more than 16 hours, and initially form a filter layer of 5 mm to ensure the subsequent solution flow and charcoal powder do not filter through; S5, after more than 16 hours of circulation, empty the solution in the filter residue slurry tank, stop the slurry tank liquid outlet pump, close the circulation liquid outlet valve, open the filter press liquid inlet valve, and when the liquid level of the filter residue slurry tank reaches the required range, close the filter press liquid inlet valve. Repeat steps S1-S4 to perform cycle oil removal; S6, set a sampling port on the filter press post-filtration liquid outlet pipeline. During the cycle oil removal, take the post-filtration liquid of the cycle pressure filter at regular intervals, analyze the oil content, observe the oil removal situation, and if the desired effect is achieved, i.e. the oil content is less than 3 ppm, record the cycle time; S7, when the oil content of the filter press post-filtration liquid meets the standard and the charcoal powder does not filter through, it means that the solution in the filter residue slurry tank can enter the production system. At this time, stop the filter press self-circulation, close the filter press liquid circulation valve, open the original liquid outlet valve of the filter press, pump the solution in the filter residue slurry tank into the filter press, and the post-filtration liquid enters the liquid outlet main pipe and enters the production system.

[0018] In step S2, the particle size of the charcoal powder is 150 μm, and the pore size of the filter cloth of the filter press is 15 μm.

[0019] Every 15 days, the filter press is opened for cake unloading operation. At this time, the filter cake thickness should be 50 mm. After disassembly, repeat the cycle from step S1.

[0020] The filter press used in step S1 is an XAZGFD150 / 1250-UK type automatic box filter press, and all subsequent steps are based on this type of filter press.

[0021] It should be understood that the foregoing detailed description of the application, rather than limiting the application, is intended to explain and describe the principles of the application and its practical application to enable others skilled in the art to adopt the application for other purposes and embodiments. Accordingly, any modifications, equivalents, improvements, etc., made to the application as described above are intended to be included within the scope of the application. In addition, the appended claims are intended to cover all such changes and modifications as fall within the scope and range of equivalents of the claims and their equivalents.

Claims

1. A method of filtering in hydrometallurgical artificial construction filter bed, characterized by, The method comprises the following steps: S1, closing the original liquid outlet valve of the filter press, opening the liquid circulation valve of the filter press, and feeding liquid through the liquid inlet pipeline of the filter press; when the liquid level of the filter residue slurry tank reaches the required range, the liquid inlet valve of the filter press is closed; S2, adding charcoal powder to the filter residue slurry tank through the charcoal powder adding hole to make it dissolve sufficiently, and adding 300 kg of activated carbon powder per time; S3, opening the liquid circulation inlet valve of the filter press and the liquid outlet pump of the filter residue slurry tank, and feeding the solution mixed with the acid-soluble liquid and the charcoal powder in the tank into the filter press for pressure filtration, thereby forming a self-circulation system of the filter residue slurry tank and the filter press through the circulation pipeline; S4, during the circulation, observing the filter flow rate and the charcoal powder content in the tank, controlling the single cycle time to be more than 16 hours, and initially forming a filter layer with a thickness of 3-5 mm to ensure the subsequent solution flow rate and charcoal powder not to be filtered out; S5, after more than 16 hours of circulation, emptying the solution in the filter residue slurry tank, stopping the slurry tank liquid outlet pump, closing the liquid circulation outlet valve, opening the liquid inlet valve of the filter press, feeding liquid until the liquid level of the filter residue slurry tank reaches the required range, closing the liquid inlet valve of the filter press, and repeating steps S1-S4 to perform the cycle oil removal; S6, setting a sampling port on the liquid outlet pipeline of the filter press, and during the cycle oil removal, regularly taking the filtered liquid of the filter press to analyze the oil content and observe the oil removal effect, and if the oil content is less than 3 ppm, the cycle time is recorded; S7, when the oil content of the filtered liquid of the filter press meets the standard and the charcoal powder is not filtered out, it is indicated that the solution in the filter residue slurry tank can enter the production system, at this time, the self-circulation of the filter press is stopped, the liquid circulation outlet valve of the filter press is closed, the original liquid outlet valve of the filter press is opened, the solution in the filter residue slurry tank is fed into the filter press, and the filtered liquid enters the liquid outlet main pipe and enters the production system.

2. The filter method of claim 1, wherein, In step S2, the particle size of the charcoal powder is between 100-150 μm, and the pore size of the filter cloth of the filter press is between 10-15 μm.

3. The method of claim 1, wherein the filter layer is formed by a wet metallurgical process. The filter press is opened every 12-15 days for cake unloading operation, at this time, the thickness of the filter cake should be between 35-50 mm, and after disassembly, the cycle is repeated from step S1.

4. The method of claim 1, wherein the filter layer is formed by a wet metallurgical process. The filter press used in step S1 is an XAZGFD150 / 1250-UK type automatic box filter press, and all subsequent steps are based on this type of filter press.