阅读说明：本技术 一种锌粉湿加的装置及方法 (Zinc powder wet-adding device and method ) 是由 陈国木 李国峰 周中华 曾鹏 欧自力 刘迅 刘建平 李朝洪 罗丽萍 王赛 吴海艳 于 2021-07-22 设计创作，主要内容包括：本发明公开一种锌粉湿加的装置及方法,所述锌粉湿加的装置包括；调浆槽,所述调浆槽的上部设置有收尘袋和至少一个加料口,下部设置有出液口；循环槽,所述循环槽的上部设置有第一进液口和第二进液口,下部设置有出液口,所述循环槽的第一进液口与所述调浆槽的出液口通过第一输送系统连接,所述循环槽的出液口与所述循环槽的第二进液口通过第二输送系统连接；所述第二输送系统中设置有至少一个出液口,所述第二输送系统中的至少一个出液口与湿法炼锌的净化反应槽连接。将锌粉和水加入到调浆槽中集中调浆后输送至循环槽然后再输送至湿法炼锌的净化反应槽中进行使用从而实现锌粉湿加,进而解决了锌粉干加过程中锌粉飞扬损失并造成环境污染的问题。(The invention discloses a zinc powder wet adding device and a method, wherein the zinc powder wet adding device comprises a zinc powder wet adding device and a zinc powder wet adding device; the upper part of the size mixing tank is provided with a dust collection bag and at least one feed inlet, and the lower part of the size mixing tank is provided with a liquid outlet; the upper part of the circulating tank is provided with a first liquid inlet and a second liquid inlet, the lower part of the circulating tank is provided with a liquid outlet, the first liquid inlet of the circulating tank is connected with the liquid outlet of the size mixing tank through a first conveying system, and the liquid outlet of the circulating tank is connected with the second liquid inlet of the circulating tank through a second conveying system; and at least one liquid outlet is arranged in the second conveying system, and the at least one liquid outlet in the second conveying system is connected with the purification reaction tank for zinc hydrometallurgy. The zinc powder and water are added into a size mixing tank for centralized size mixing, then conveyed to a circulating tank and then conveyed to a purification reaction tank for zinc hydrometallurgy for use, so that the zinc powder wet addition is realized, and the problems of zinc powder flying loss and environmental pollution in the zinc powder dry addition process are solved.)

1. A zinc powder wet-adding device is characterized by comprising:

the upper part of the size mixing tank is provided with a dust collection bag and at least one charging opening, and the lower part of the size mixing tank is provided with a liquid outlet;

the upper part of the circulating tank is provided with a first liquid inlet and a second liquid inlet, the lower part of the circulating tank is provided with a liquid outlet, the first liquid inlet of the circulating tank is connected with the liquid outlet of the size mixing tank through a first conveying system, and the liquid outlet of the circulating tank is connected with the second liquid inlet of the circulating tank through a second conveying system;

and at least one liquid outlet is arranged in the second conveying system, and the at least one liquid outlet in the second conveying system is connected with the purification reaction tank for zinc hydrometallurgy.

2. The zinc dust wet addition device as defined in claim 1, wherein a pneumatic valve is provided at each outlet of said second conveying system.

3. The zinc dust wet addition device as defined in claim 1, further comprising:

and the filtering device is arranged between the circulating tank and the first liquid inlet at the upper part of the circulating tank.

4. The zinc powder wet-adding device as defined in claim 1,

the first conveying system comprises a first conveying pump and a first conveying pipeline, and the first conveying pump is arranged at an outlet of the size mixing tank and is connected with a first liquid inlet of the circulating tank through the first conveying pipeline;

the second conveying system comprises a second conveying pump and a second conveying pipeline, and the second conveying pump is arranged at an outlet of the circulating tank and is connected with a second liquid inlet of the circulating tank through the second conveying pipeline;

each liquid outlet of the second conveying system is arranged on the second conveying pipeline.

5. The zinc dust wet addition device as defined in claim 1, further comprising:

the upper part of the cleaning tank is provided with a liquid feeding port, and the lower part of the cleaning tank is provided with a liquid outlet;

the cleaning pump is arranged at the liquid outlet of the cleaning tank and is connected with the second conveying pipeline through a third conveying pipeline;

the liquid discharging device is characterized in that a liquid inlet is formed in the upper portion of the liquid discharging device, a liquid outlet is formed in the lower portion of the liquid discharging device, and the liquid inlet in the upper portion of the liquid discharging device is connected with the second conveying pipeline through a fourth conveying pipeline.

6. A zinc dust wet addition process using the zinc dust wet addition device of any one of claims 1 to 5, characterized by the steps of:

adding zinc powder and water into a size mixing tank with a dust collection bag arranged above the size mixing tank for size mixing to obtain zinc powder size;

and after the zinc powder slurry is conveyed into a circulating groove through a first conveying system, conveying a part of the zinc powder slurry in the circulating groove into a purification reaction groove for zinc hydrometallurgy through a second conveying system, and conveying the other part of the zinc powder slurry in the circulating groove back into the circulating groove through the second conveying system to realize circulation of the other part of the zinc powder slurry in the circulating groove and the second conveying system.

7. The wet addition method of zinc powder as defined in claim 6, wherein the mass ratio of the zinc powder to water is 1:2-1: 4.

8. The method for the wet addition of zinc dust according to claim 6, characterized in that the zinc dust is electric zinc dust or blown zinc dust.

9. The process for the wet addition of zinc dust according to claim 6, characterized in that the zinc dust slurry is filtered and then fed to a circulation tank.

10. The method for the wet addition of zinc dust as defined in claim 6, characterized in that the zinc dust slurry feed rate is controlled by pneumatic valves before feeding a portion of the zinc dust slurry into the zinc hydrometallurgy clean-up tank.

Technical Field

The invention relates to the field of zinc hydrometallurgy, in particular to a zinc powder wet adding device and a zinc powder wet adding method.

Background

In the purification process of the wet zinc smelting process, zinc powder is required to be added to replace and remove impurities such as copper, cadmium, cobalt, antimony and the like in the solution, a dry powder belt scale is generally adopted for adding after metering, the zinc powder added into a reaction tank is ensured to be accurate and uniform, so that the stability of the purification process is ensured, but the problems of dry powder flying loss, zinc powder flying above the purification reaction tank and serious dust deposition to pollute the operating environment exist.

Therefore, the prior art still needs to be improved and developed.

Disclosure of Invention

In view of the defects of the prior art, the invention aims to provide a zinc powder wet adding device and a zinc powder wet adding method, and aims to solve the problems of zinc powder flying loss and environmental pollution caused by adding zinc powder in the existing wet zinc smelting purification process.

The technical scheme of the invention is as follows:

in a first aspect of the invention, a zinc powder wet-adding device is provided, which comprises:

the upper part of the size mixing tank is provided with a dust collection bag and at least one charging opening, and the lower part of the size mixing tank is provided with a liquid outlet;

the upper part of the circulating tank is provided with a first liquid inlet and a second liquid inlet, the lower part of the circulating tank is provided with a liquid outlet, the first liquid inlet of the circulating tank is connected with the liquid outlet of the size mixing tank through a first conveying system, and the liquid outlet of the circulating tank is connected with the second liquid inlet of the circulating tank through a second conveying system;

and at least one liquid outlet is arranged in the second conveying system, and the at least one liquid outlet in the second conveying system is connected with the purification reaction tank for zinc hydrometallurgy.

Optionally, a pneumatic valve is provided at each outlet in the second delivery system.

Optionally, the method further comprises: and the filtering device is arranged between the circulating tank and the first liquid inlet at the upper part of the circulating tank.

Optionally, the first conveying system comprises a first conveying pump and a first conveying pipeline, and the first conveying pump is arranged at an outlet of the size mixing tank and is connected with a first liquid inlet of the circulation tank through the first conveying pipeline;

the second conveying system comprises a second conveying pump and a second conveying pipeline, and the second conveying pump is arranged at an outlet of the circulating tank and is connected with a second liquid inlet of the circulating tank through the second conveying pipeline;

each liquid outlet of the second conveying system is arranged on the second conveying pipeline.

Optionally, the method further comprises: the upper part of the cleaning tank is provided with a liquid feeding port, and the lower part of the cleaning tank is provided with a liquid outlet;

the cleaning pump is arranged at the liquid outlet of the cleaning tank and is connected with the second conveying pipeline through a third conveying pipeline;

the liquid discharging device is characterized in that a liquid inlet is formed in the upper portion of the liquid discharging device, a liquid outlet is formed in the lower portion of the liquid discharging device, and the liquid inlet in the upper portion of the liquid discharging device is connected with the second conveying pipeline through a fourth conveying pipeline.

In a second aspect of the invention, there is provided a zinc powder wet adding method using the zinc powder wet adding device of the invention, wherein the method comprises the following steps:

adding zinc powder and water into a size mixing tank with a dust collection bag arranged above the size mixing tank for size mixing to obtain zinc powder size;

and after the zinc powder slurry is conveyed into a circulating groove through a first conveying system, conveying a part of the zinc powder slurry in the circulating groove into a purification reaction groove for zinc hydrometallurgy through a second conveying system, and conveying the other part of the zinc powder slurry in the circulating groove back into the circulating groove through the second conveying system to realize circulation of the other part of the zinc powder slurry in the circulating groove and the second conveying system.

Optionally, the mass ratio of the zinc powder to the water is 1:2-1: 4.

Optionally, the zinc powder is electric furnace zinc powder or injection zinc powder.

Optionally, the zinc dust slurry is filtered and then conveyed to a circulating groove.

Optionally, the conveying amount of the zinc powder slurry is controlled by a pneumatic valve before a part of the zinc powder slurry is conveyed into a purification reaction tank of the zinc hydrometallurgy.

Has the advantages that: the invention provides a zinc powder wet adding device and a zinc powder wet adding method, wherein the zinc powder wet adding device comprises a size mixing tank, a circulating tank, a first conveying system and a second conveying system, a dust collecting bag is arranged at the upper part of the size mixing tank and can collect flying zinc powder into the dust collecting bag to ensure that dust in the surrounding environment does not exceed the standard, the zinc powder and water are added into the size mixing tank provided with the dust collecting bag to be intensively mixed, and then are conveyed into the circulating tank and then are conveyed into a purification reaction tank for wet zinc smelting to be used, so that the zinc powder wet adding is realized, and the problems of flying loss of the zinc powder and environmental pollution in the zinc powder dry adding process are solved.

Drawings

FIG. 1 is a process flow diagram of an embodiment of the present invention.

FIG. 2 is a process flow diagram of examples 1 and 2 of the present invention.

Detailed Description

The invention provides a device and a method for adding zinc powder in a wet manner, and the invention is further described in detail below in order to make the purpose, the technical scheme and the effect of the invention clearer and clearer. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

During the purification process of zinc hydrometallurgy, zinc powder is added to replace impurities, and the traditional method adopts a mode of adding zinc powder dry powder, so that the problems of flying loss of the zinc powder dry powder and environmental pollution exist.

Based on this, an embodiment of the present invention provides a zinc powder wet-adding device as shown in fig. 1, where the device includes:

the upper part of the size mixing tank is provided with a dust collection bag and at least one charging opening, and the lower part of the size mixing tank is provided with a liquid outlet;

the upper part of the circulating tank is provided with a first liquid inlet and a second liquid inlet, the lower part of the circulating tank is provided with a liquid outlet, the first liquid inlet of the circulating tank is connected with the liquid outlet of the size mixing tank through a first conveying system, and the liquid outlet of the circulating tank is connected with the second liquid inlet of the circulating tank through a second conveying system;

and at least one liquid outlet is arranged in the second conveying system, and the at least one liquid outlet in the second conveying system is connected with the purification reaction tank for zinc hydrometallurgy.

In this embodiment, at least one feed inlet is arranged above the size mixing tank, when only one feed inlet is provided, zinc powder and water are added from the feed inlet, when two feed inlets are provided, one feed inlet is used as a powder adding inlet, zinc powder is added into the size mixing tank from the powder adding inlet, the other feed inlet is used as a water adding inlet, and water is added into the size mixing tank from the water adding inlet. The upper part of the size mixing tank is provided with a dust collecting bag which can be a dust collecting cloth bag, but is not limited to the dust collecting cloth bag, the dust collecting bag can collect flying zinc powder into the cloth bag to ensure that dust of the surrounding environment is not over standard, and the zinc powder collected into the dust collecting bag can be recycled. The lower part of the slurry mixing tank is provided with a liquid outlet, the prepared zinc powder slurry is output from the liquid outlet, the zinc powder slurry output from the liquid outlet of the slurry mixing tank is conveyed to a first liquid inlet of a circulating tank through a first conveying system, enters the circulating tank from the first liquid inlet, is output through the liquid outlet at the lower part of the circulating tank, then a part of the zinc powder slurry is conveyed to a liquid outlet of a second conveying system through a second conveying system, one or more liquid outlets of the second conveying system are provided, the zinc powder slurry output from each liquid outlet is conveyed to a purification reaction tank for wet zinc smelting, the other part of the zinc powder slurry is conveyed to a second liquid inlet of the circulating tank through the second conveying system, enters the circulating tank from the second liquid inlet, the circulation of the zinc powder slurry in the circulating tank and the second conveying system is realized, and the circulating flow of the zinc powder slurry is always kept, the deposition of zinc powder in the circulation tank and the second conveying system can be avoided, and the waste of the zinc powder is avoided. In other words, the second conveying system in this embodiment functions to circulate the zinc dust slurry and to convey the zinc dust slurry to the zinc hydrometallurgy clean-up tank for use.

In this embodiment, if the purification reaction tank of hydrometallurgy zinc is arranged at the high position relative to the position of the circulation tank, the liquid outlet arranged in the second conveying system can be arranged at the high position relative to the position of the circulation tank according to actual needs, and also can be arranged at the same height relative to the circulation tank, and then zinc powder slurry is conveyed to the purification reaction tank of hydrometallurgy zinc at the high position through the conveying system.

In one embodiment, a water meter is arranged at the feeding port at the upper part of the size mixing tank, so that the water consumption can be accurately controlled.

In one embodiment, an electronic scale is arranged at a feeding port on the upper part of the size mixing tank, so that the weight of zinc powder can be accurately weighed, and the accurate control of the liquid-solid ratio (the mass ratio of water to zinc powder in zinc powder slurry) of the zinc powder slurry is realized, so that the zinc powder slurry in the device can flow smoothly.

In one embodiment, a stirring device is further arranged in the size mixing tank and the circulating tank, and the stirring device is used for stirring the zinc powder slurry in the size mixing tank and the circulating tank so as to enable the zinc powder slurry to be uniformly mixed.

In one embodiment, a pneumatic valve is arranged at each outlet of the second conveying system, and the output of the zinc powder slurry from each outlet of the second conveying system is controlled by the pneumatic valve, and the output of the zinc powder slurry from each outlet of the second conveying system is measured by controlling the frequency and the time of opening of the pneumatic valve. For example, the amount of zinc powder slurry to be added per hour is calculated according to the amount of dry zinc powder to be added per hour and the liquid-solid ratio of the zinc powder slurry in the purification reaction tank for zinc hydrometallurgy, and the adding amount of the zinc powder slurry is controlled by setting the number of times of adding per hour (namely, the frequency of opening the pneumatic valve) and the time of opening the pneumatic valve each time according to the process sequence.

In one embodiment, the first conveying system comprises a first conveying pump and a first conveying pipeline, wherein the first conveying pump is arranged at the outlet of the size mixing tank and is connected with the first liquid inlet of the circulating tank through the first conveying pipeline;

the second conveying system comprises a second conveying pump and a second conveying pipeline, and the second conveying pump is arranged at an outlet of the circulating tank and is connected with a second liquid inlet of the circulating tank through the second conveying pipeline;

each liquid outlet of the second conveying system is arranged on the second conveying pipeline.

In the embodiment, zinc powder slurry output from a liquid outlet at the bottom of a size mixing tank sequentially flows through a first conveying pump and a first conveying pipeline, and then enters a circulation tank from a first liquid inlet at the upper part of the circulation tank; and the liquid outlet in the second conveying system is arranged on a second conveying pipeline, after zinc powder slurry output from the liquid outlet at the bottom of the circulating groove sequentially flows through a second conveying pump and the second conveying pipeline, one part of the zinc powder slurry is output from the liquid outlet on the second conveying pipeline and conveyed to a purification reaction tank for zinc hydrometallurgy for use, and the other part of the zinc powder slurry continuously flows in the second conveying pipeline and is finally conveyed to a second liquid inlet at the upper part of the circulating groove to enter the circulating groove so as to realize circulating flow in the circulating groove and the conveying pipeline.

In one embodiment, the zinc powder wet addition device further comprises: and the filtering device is arranged between the circulating tank and the first liquid inlet at the upper part of the circulating tank. The zinc powder slurry conveyed to the liquid inlet of the circulation groove is filtered by a filtering device and then enters the circulation groove. The filter device can sieve out large-particle zinc powder in the zinc powder slurry to avoid the blockage of a conveying system (a conveying pump and a conveying pipeline).

In one embodiment, the filter device is a screen.

In one embodiment, the mesh size of the screen is less than 100 mesh. The specific lower limit value of the mesh number of the screen can be set according to actual requirements.

In one embodiment, the zinc powder wet addition device further comprises:

the upper part of the cleaning tank is provided with a liquid feeding port, and the lower part of the cleaning tank is provided with a liquid outlet; the cleaning pump is arranged at the liquid outlet of the cleaning tank and is connected with the second conveying pipeline through a third conveying pipeline;

the liquid discharging device is characterized in that a liquid inlet is formed in the upper portion of the liquid discharging device, a liquid outlet is formed in the lower portion of the liquid discharging device, and the liquid inlet in the upper portion of the liquid discharging device is connected with the second conveying pipeline through a fourth conveying pipeline.

In this embodiment, washing tank, scavenging pump, liquid eduction gear constitute one set of washing system, prevent the deposit of zinc powder in second pipeline and the second delivery pump through the washing to second pipeline and second delivery pump, avoid because of the jam that zinc powder deposit caused. When zinc powder wet adding is finished and the machine is stopped, zinc powder can be attached to the inner surfaces of the second conveying pipeline and the second conveying pump, and the second conveying pipeline and the second conveying pump are cleaned for the first time and the second time, so that zinc powder deposition caused by the machine stop and pipeline blockage can be avoided. The cleaning solution is conveyed into a second conveying pipeline through a cleaning pump and a third conveying pipeline which are arranged at the liquid outlet of the cleaning tank, then the cleaning solution is circularly cleaned in the second conveying pipeline and a circulating tank, and finally the cleaned solution is conveyed to a liquid discharge device through a fourth conveying pipeline connected with the second conveying pipeline to finish the first cleaning. The above process is repeated, and the difference is only that clean water is added into the cleaning tank from the liquid adding opening at the upper part of the cleaning tank, and the second cleaning is completed. Of course, the washing system can also clean the circulation tank at the same time.

In one embodiment, the junction of the fourth conduit and the second conduit is located between the junction of the third conduit and the second liquid inlet.

In one embodiment, a third delivery pump and a fifth delivery pipeline are further arranged at the liquid outlet at the lower part of the liquid discharge device, and are used for discharging the cleaned liquid in the liquid discharge device. The third conveying pump is connected with a liquid outlet at the lower part of the liquid discharge device, and the fifth conveying pipeline is connected with the third conveying pump.

In one embodiment, the cleaning solution in the cleaning tank has a pH of 0.5 to 3.5, and the first cleaning of the transfer pipe is performed with the cleaning solution.

It should be noted that the size mixing tank, the circulation tank, the first conveying system and the second conveying system form a set of device, in the actual production process, a plurality of sets of parallel devices can be arranged according to the actual demand of the zinc powder slurry, and the plurality of sets of parallel devices can share one set of washing system, as shown in fig. 2.

The embodiment of the invention also provides a zinc powder wet adding method adopting the zinc powder wet adding device provided by the embodiment of the invention, which comprises the following steps:

adding zinc powder and water into a size mixing tank with a dust collection bag arranged above the size mixing tank for size mixing to obtain zinc powder size;

and after the zinc powder slurry is conveyed into a circulating groove through a first conveying system, conveying a part of the zinc powder slurry in the circulating groove into a purification reaction groove for zinc hydrometallurgy through a second conveying system, and conveying the other part of the zinc powder slurry in the circulating groove back into the circulating groove through the second conveying system to realize circulation of the other part of the zinc powder slurry in the circulating groove and the second conveying system.

In this embodiment, after the zinc powder slurry is conveyed to the circulation tank, a part of the zinc powder slurry in the circulation tank is conveyed to the purification reaction tank for zinc hydrometallurgy (conveyed according to the amount of the zinc powder slurry required by the purification reaction tank), and the other part of the zinc powder slurry is conveyed back to the circulation tank to realize circulation of the slurry in the circulation tank and the conveying system, so that the circulation flow of the zinc powder slurry can be kept all the time, and the deposition of zinc powder in the circulation tank and the conveying system is avoided. And conveying a part of the zinc powder slurry in the circulating tank to a purification reaction tank for the wet-process zinc smelting to purify a zinc-containing solution in the wet-process zinc smelting process. Specifically, the zinc-containing solution in the zinc hydrometallurgy process contains impurities such as copper, cadmium, cobalt and the like, and the impurities are removed by replacement in the purification reaction tank by using zinc in the zinc powder slurry in the embodiment of the invention. In addition, the method for wet adding of zinc powder provided by the embodiment can also avoid the problem that the surface of the zinc powder is wrapped by an oxide film in the conventional zinc powder dry adding process, so that the activity of the zinc powder is improved.

In one embodiment, the zinc powder wet adding method specifically comprises the following steps:

adding the weighed zinc powder and water into a size mixing tank with a dust collection bag arranged above the size mixing tank for size mixing for 0.5h to obtain zinc powder size;

conveying the zinc powder slurry to a liquid inlet at the middle upper part of a circulating groove through a first conveying system, and filtering through a filtering device;

conveying the filtered zinc powder slurry to a circulating groove, conveying a part of the zinc powder slurry in the circulating groove to a liquid outlet in a second conveying system through a second conveying system, controlling the conveying amount of the zinc powder slurry through a pneumatic valve, conveying the zinc powder slurry to a purification reaction tank for zinc hydrometallurgy, and conveying the other part of the zinc powder slurry in the circulating groove to the circulating groove through the second conveying system to realize the circulation of the other part of the zinc powder slurry in the circulating groove and the second conveying system.

In the embodiment, the dust collection bag is arranged to collect the flying zinc powder into the cloth bag to ensure that the dust in the surrounding environment does not exceed the standard, and the zinc powder collected into the dust collection bag can be recycled; the zinc powder slurry is filtered and then conveyed into a circulating groove, so that large-particle zinc powder in the zinc powder slurry can be screened out to avoid blocking a conveying pipeline; the zinc powder slurry adding method comprises the steps of conveying a part of zinc powder slurry into a purification reaction tank for zinc hydrometallurgy, controlling the conveying amount of the zinc powder slurry through a pneumatic valve before conveying the part of the zinc powder slurry into the purification reaction tank for zinc hydrometallurgy, accurately controlling the adding amount of zinc powder in a new purification reaction tank for zinc hydrometallurgy, avoiding waste, specifically calculating the adding amount of the zinc powder slurry required in each hour according to the dry powder amount of the zinc powder required to be added in each hour in the purification reaction tank for zinc hydrometallurgy and the liquid-solid ratio of the zinc powder slurry, and sequentially setting the adding times (namely the opening frequency of the pneumatic valve) required in each hour and the opening time of the pneumatic valve in each time to control the adding amount of the zinc powder slurry.

It should be noted that, the method for applying zinc powder according to the embodiment of the present invention may be implemented not only by the device for applying zinc powder according to the embodiment of the present invention, but also by other devices capable of implementing the method for wet-adding zinc powder according to the embodiment of the present invention.

In one embodiment, the mass ratio of the zinc powder to the water is 1:2 to 1: 4. Namely, zinc powder and water are added into a size mixing tank according to the mass ratio of 1:2-1:4 for size mixing to obtain zinc powder size.

In one embodiment, the zinc powder is electric furnace zinc powder or injection zinc powder.

The electric furnace zinc powder is obtained by uniformly mixing zinc oxide concentrate or zinc calcine, a carbonaceous reducing agent and a flux according to the mixing ratio required by smelting, baking the mixture in a rotary drying kiln, reducing and smelting the mixture in an electric furnace to reduce and volatilize zinc in the material, feeding reduced zinc steam into a condenser along with high-temperature flue gas, rapidly cooling the reduced zinc steam into fine-grained zinc powder and collecting the fine-grained zinc powder.

The zinc powder is obtained by melting cathode zinc, zinc ingots and crushed zinc in a reverberatory furnace to obtain zinc liquid, blowing the zinc liquid into mist by using compressed air, and directly and rapidly cooling in a closed container.

In one embodiment, the zinc powder has a particle size of 200-400 mesh.

The invention is further illustrated by the following specific examples.

Example 1

In this example, a blown zinc powder was used, and the particle size was 400 mesh.

As shown in figure 2, the injected zinc powder and water are added into a size mixing tank 1# and a size mixing tank 2# respectively from a powder adding port and a water adding port according to a mass ratio of 1:4 (the mass of the zinc powder is accurately weighed by an electronic scale arranged at the powder adding port, and the water consumption is controlled by a water meter arranged at the water adding port), and size mixing is carried out for 0.5h, meanwhile, a dust collecting cloth bag is arranged above the size mixing tank, and the flying zinc powder is collected into the size mixing tank, so that the dust content of the environment around the powder adding point is not over standard.

The zinc powder slurry obtained after size mixing in the size mixing tank 1# and the size mixing tank 2# is respectively pumped to a liquid inlet of a circulation tank 3# and a liquid inlet of a circulation tank 4# through conveying pipelines by utilizing conveying pumps respectively connected with the size mixing tank 1# and the size mixing tank 2#, and large-particle zinc powder in the zinc powder slurry is filtered out through 100-mesh screens respectively arranged above the circulation tank 3# and the circulation tank 4# and then respectively enters the circulation tank 3# and the circulation tank 4 #.

The zinc powder slurry filtered in the circulation groove 3# and the circulation groove 4# is respectively pumped to the using points 1-1#, 1-2#, 1-3# and the using points 2-1#, 2-2#, 2-3# which are 50 meters far and 15 meters high by using a conveying pump respectively connected with the circulation groove 3# and the circulation groove 4# (namely the zinc powder slurry in the circulation groove 3# is pumped to the using points 1-1#, 1-2#, 1-3#, the zinc powder slurry in the circulation groove 4# is pumped to the using points 2-1#, 2-2#, 2-3#), a part of the ore slurry conveyed from the circulation groove 3# to the using points 1-1#, 1-2#, 1-3# is used at the using points 1-1#, 1-2#, 1-3# or is conveyed to a purification reaction tank (not shown in figure 2) for wet zinc smelting, and the other part of the zinc powder slurry is continuously circulated back to the circulation tank 3# through a circulation pipeline, one part of the zinc powder slurry conveyed from the circulation tank 4# to the using points 2-1#, 2-2#, and 2-3# is used at the using points 2-1#, 2-2#, and 2-3# or conveyed to a purification reaction tank (not shown in figure 2) for zinc powder wet smelting, and the other part of the zinc powder slurry is continuously circulated back to the circulation tank 4# through the circulation pipeline, so that the circulation of the zinc powder slurry in the pipeline is realized, and the deposition of zinc powder in the pipeline is avoided. Pneumatic valves are respectively arranged at the using points 1-1#, 1-2#, 1-3#, 2-1#, 2-2#, and 2-3#, the amount of zinc powder slurry required to be added in each hour is calculated according to the amount of zinc powder dry powder required to be used in each hour and the solid-liquid mass ratio of the zinc powder slurry (the mass ratio of zinc powder to water in the zinc powder slurry), the number of times required to be added in each hour and the opening time of the pneumatic valve in each hour are set by a process sequence to control the flow rate of the zinc powder slurry, and the accurate control of the adding amount of the zinc powder at the using points is ensured.

And arranging two cleaning tanks at the outlets of the conveying pumps respectively connected with the circulating tank 3# and the circulating tank 4#, controlling the pH value of an acid solution in each cleaning tank to be 3, cleaning the conveying pipeline for the first time by using liquid in each cleaning tank when the machine is stopped, cleaning the conveying pipeline for the second time by using water, and discharging the cleaned liquid out of the system through a liquid discharging device.

Example 2

In this example, electric furnace zinc powder having a particle size of 200 mesh was used.

As shown in figure 2, electric furnace zinc powder and water are respectively added into a size mixing tank 1# and a size mixing tank 2# from a powder adding port and a water adding port according to a mass ratio of 1:2.5 (the mass of the zinc powder is accurately weighed by an electronic scale arranged on the powder adding port, and the water consumption is controlled by a water meter arranged on the powder adding port) to be subjected to size mixing for 0.5h, meanwhile, a dust collecting cloth bag is arranged above the size mixing tank, and flying zinc powder is collected into the size mixing tank, so that the dust content of the environment around a powder adding point is not over standard.

The zinc powder slurry obtained after size mixing in the size mixing tank 1# and the size mixing tank 2# is respectively pumped to a liquid inlet of a circulation tank 3# and a liquid inlet of a circulation tank 4# through conveying pipelines by utilizing conveying pumps respectively connected with the size mixing tank 1# and the size mixing tank 2#, and large-particle zinc powder in the zinc powder slurry is filtered out through 100-mesh screens respectively arranged above the circulation tank 3# and the circulation tank 4# and then respectively enters the circulation tank 3# and the circulation tank 4 #.

The zinc powder slurry filtered in the circulation groove 3# and the circulation groove 4# is respectively pumped to the using points 1-1#, 1-2#, 1-3#, 2-1#, 2-2#, and 2-3# which are 50 meters far and 15 meters high by using the conveying pumps respectively connected with the circulation groove 3# and the circulation groove 4# (namely the zinc powder slurry in the circulation groove 3# is pumped to the using points 1-1#, 1-2#, and 1-3#, and the zinc powder slurry in the circulation groove 4# is pumped to the using points 2-1#, 2-2#, and 2-3 #). A part of the zinc dust slurry conveyed from the circulation tank 3# to the use points 1-1#, 1-2#, 1-3# is used at the use points 1-1#, 1-2#, 1-3# or conveyed to a purification reaction tank (not shown in figure 2) for wet zinc smelting, and the other part of the zinc powder slurry is continuously circulated back to the circulation tank 3# through a circulation pipeline, one part of the zinc powder slurry conveyed from the circulation tank 4# to the using points 2-1#, 2-2#, and 2-3# is used at the using points 2-1#, 2-2#, and 2-3# or conveyed to a purification reaction tank (not shown in figure 2) for zinc powder wet smelting, and the other part of the zinc powder slurry is continuously circulated back to the circulation tank 4# through the circulation pipeline, so that the circulation of the zinc powder slurry in the pipeline is realized, and the deposition of zinc powder in the pipeline is avoided. Pneumatic valves are respectively arranged at the using points 1-1#, 1-2#, 1-3#, 2-1#, 2-2#, and 2-3#, the quantity of zinc powder slurry which needs to be added in each hour is calculated according to the quantity of zinc powder dry powder which needs to be used in each hour and the solid-liquid mass ratio of the zinc powder slurry (the mass ratio of zinc powder to water in the zinc powder slurry), the number of times which needs to be added in each hour and the opening time of the pneumatic valve in each hour are set by a process sequence to control the flow rate of the ore slurry, and the accurate control of the adding quantity of the zinc powder at the using points is ensured.

The method comprises the following steps that a cleaning tank with two sides is arranged at an outlet of a conveying pump respectively connected with a circulation tank 3# and a circulation tank 4#, the PH value of an acid-containing solution in the cleaning tank is controlled to be 2, when the machine is stopped, the conveying pipeline is cleaned for the first time by using liquid in the cleaning tank, the conveying pipeline is cleaned for the second time by using water, and the liquid after cleaning is discharged out of a system through a liquid discharging device.

In conclusion, the invention provides a zinc powder wet adding device and a zinc powder wet adding method, the zinc powder wet adding device accurately controls the adding amount of water and zinc powder by arranging a water meter and an electronic scale at a feeding port at the upper part of a size mixing tank, collects flying zinc powder into a cloth bag by arranging a dust collecting bag at the upper part of the size mixing tank to ensure that dust of the surrounding environment does not exceed the standard, ensures that zinc powder slurry circulates in the circulation tank and a second conveying system to ensure that the flow of the zinc powder slurry is smooth by arranging the second conveying system between a liquid outlet of the circulation tank and a second liquid inlet, and ensures that the adding amount of the zinc powder is accurate when the zinc powder is conveyed to a purification reaction tank for zinc hydrometallurgy by arranging a pneumatic valve at a liquid outlet of the second conveying system. According to the zinc powder wet adding method provided by the invention, the zinc powder is intensively mixed with water and then conveyed to the purification reaction tank for zinc hydrometallurgy for use, so that the problem that the surface of the zinc powder is coated by an oxide film in the conventional zinc powder dry adding process can be avoided, and the activity of the zinc powder is improved. The zinc powder wet adding device and the zinc powder wet adding method provided by the invention not only solve the problems of zinc powder flying loss and environmental pollution caused by zinc powder dry adding in the wet zinc smelting impurity removal process, but also can ensure accurate metering of zinc powder pulp, effectively reduce unit consumption of zinc powder and reduce cost.

It is to be understood that the invention is not limited to the examples described above, but that modifications and variations may be effected thereto by those of ordinary skill in the art in light of the foregoing description, and that all such modifications and variations are intended to be within the scope of the invention as defined by the appended claims.