Device and method for preparing zinc powder and pulp

Abstract

The embodiment of the invention discloses a device for preparing zinc powder and pulp. The device for preparing zinc powder comprises a zinc melting furnace, an electrically-heated insulated flow pipe, a heat preserving furnace, an atomizing nozzle, an atomizing tower, a high pressure water system, a wet vibrating screen and a segmented settling tank, wherein the heat preserving furnace and the zinc melting furnace constitute a U-shaped communicating vessel by the electrically-heated insulated flow pipe, and the zinc melting furnace, the electrically-heated insulated flow pipe and the heat preserving furnace constitute a horizontal and steady liquid-zinc flow channel, thereby ensuring that the liquid level of the liquid zinc in the heat preserving furnace is constant and the liquid zinc is clean, the flow velocity, flow quantity and temperature of the liquid zinc flowing out of the heat preserving furnace are stable, and then realizing the continuous stable production of the zinc powder. In addition, in the invention, the liquid zinc can be atomized by a high pressure atomized water flow without air atomization, which avoids the zinc powder from contacting with air, therefore, theprepared zinc powder has the advantages of no oxide film on the surface, small and uniform particle size, large specific surface area and good activity, and is helpful for the smooth processing of the zinc hydrometallurgy.

Description

technical field [0001] The invention relates to the technical field of zinc powder preparation, and more specifically, relates to a zinc powder preparation and slurry-making device and method. Background technique [0002] In recent years, the method of hydrometallurgy has developed rapidly, and the production capacity has increased rapidly. In the zinc hydrometallurgy process, zinc powder is used as a displacer in the zinc hydrometallurgy process due to its negative standard electrode potential, large specific surface area and chemical activity. In the zinc hydrometallurgy process, the purification replacement reaction is mainly a multiphase contact reaction on the surface of zinc powder. Therefore, the specific surface area of ​​zinc powder is an important factor affecting the replacement reaction. The larger the specific surface area of ​​zinc powder, the faster the replacement reaction. more quickly and completely. For zinc powder, since the specific surface area of ​​...

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Problems solved by technology

[0004] In the process of preparing zinc powder by the air atomization method, due to the low and unstable compressed air pressure of the entire electrolytic zinc plant, it is difficult to achieve the appropriate air pressure required for the production of fine-grained zinc powder, so the produced zinc powder is relatively coarse and Large particle size fluctuation range

Moreover, the temperature of the molten zinc after smelting in the zinc melting furnace is usually 550°C to 600°C. The molten zinc is in direct contact with the compressed air introduced in the siphon powder blower, and the molten zinc and air undergo an oxidation reaction, so that the surface of the zinc powder particles Covered with an oxide film, so the activity of zinc powder is poor

Therefore, the surface of the zinc powder particles prepared by the air atomization method has an oxide film, a large particle size, and poor activity, which is not conducive to the smooth progress of the purification process in the hydrometallurgy process.

In addition, when air atomization is used to prepare zinc powder, the zinc liquid in the zinc melting furnace 101 enters the siphon powder blower 102 through the quartz tube, and the zinc liquid is easy to solidify in it, and the quartz tube is easily damaged, making it difficult to realize the continuous production of zinc powder

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