Method and device for washing wet-process zinc metallurgy output slag

Abstract

The invention relates to a washing method and the device thereof for the output slag of zinc hydrometallurgy. The washing process is directly performed on a compartment type filter pressing machine, the washing process is performed after the filter pressing is accomplished, and the filtering slag is fully pressed, the outlet valves of the compartment type filter pressing machine are divided into four groups, each side has two groups, the outlet valves at the identical side are allocated uniformly and alternatively into one group; the washing process can be divided into seven periods to perform: firstly, all the outlet valves of the compartment type filter pressing machine are closed, clean water is continuously pumped in, the outlet valves of each group are opened step by step, and the grouping washing step is performed once more. Two water storage bucket used for filling water to a middle groove are added on the device of the invention on the basis of the compartment type filter pressing machine and the corollary equipment. The invention can ensure the compartment type filter pressing machine to keep a certain pressure after the pressure boost washing inside is completed, the phenomenon of shortcircuit of washing water is completely overcome, and the invention achieves that the washing process is better, the water consumption is less and the washing effect is better. The water consumption reaches 0.4 to 0.5 ton water per slag, the water soluble zinc in the slag is reduced to below 1 percent. The equipment of the device is simple, and the investment is economized.

Description

technical field [0001] The invention relates to a smelting method and a device, in particular to a method and a device for washing slag produced by hydrometallurgy. Background technique [0002] At present, the zinc smelting method usually adopts the zinc hydrometallurgy process, which generally includes steps such as roasting, leaching, purification, and electrolysis. The slag produced during the leaching process of this process has a certain zinc content depending on the production method. different. If the conventional two-stage leaching method is adopted, the zinc content of the leached slag is generally between 15 and 20%, and it needs to be separated from liquid to solid, and then the zinc and other valuable metals in it can be recovered through rotary kiln and other equipment. The liquid-solid separation equipment generally adopts box-type filter press and other equipment. After the liquid-solid separation is carried out by the filter press, the solution remaining in...

AI Technical Summary

Problems solved by technology

When the water consumption reaches 1.5-2 tons of water / slag, the water-soluble zinc content in the slag can also be reduced to less than 1%, but the water consumption is large, the system adds more water, and the water that can be discharged is less, and the volume of the system expands, resulting in difficult volume. balance

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