Oxidizing roasting method of hard zinc vacuum smelting furnace slag

Abstract

The invention discloses an oxidizing roasting method of hard zinc vacuum smelting furnace slag. Based on the characteristic that hydrogen peroxide, manganese dioxide, chlorate and other oxidants havehigh microwave absorbability and the principle that the low-frequency microwave radiation penetrating power is high, ferric oxide and lead oxide are also matter with high microwave absorbability, hydrogen peroxide or manganese dioxide or chlorate is added into the broken hard zinc vacuum smelting furnace slag according to the quantity being 1-1.5 times of the total quantity of iron and lead, the materials are mixed to be uniform, microwaves with the frequency of 2-10 GHz and the power of 500-2,000 W are used for radiation for 20-60 min, the temperature is controlled to be 300-500 DEG C, and the oxidation rate of ferric alloy and lead alloy in the vacuum smelting furnace slag reaches 95% or above. After the vacuum smelting furnace slag in an alloy state is mixed with the oxidants, microwaves can be efficiently absorbed, instant high temperature is generated, and the alloy is rapidly and uniformly oxidized into metal oxides, so that hydrometallurgy leaching is promoted. The oxidizing roasting method has the characteristics that in microwave fields, the heat utilization rate is high, the time is short, the energy consumption is low, cleanliness is achieved, and materials and environments cannot be polluted.

Description

technical field

[0001] The invention belongs to the technical field of microwave metallurgy, and in particular relates to a method in which hard zinc containing germanium, indium, zinc, iron and lead, which is a by-product of pyrometallurgy, is oxidized and roasted by using microwave radiation to oxidize and roast the remaining slag after evaporating zinc in a vacuum furnace. Background technique

[0002] Materials containing germanium, indium, zinc, iron, and lead are smelted in pyroelectric furnace or vertical tank, so that germanium, indium, zinc, and lead are enriched in metal crude zinc, and then smelted by silicon carbide tray pyrolysis to purify While obtaining refined zinc, hard zinc containing germanium, indium, zinc, iron, and lead is also produced by-product, and the hard zinc is in an alloy state. Melting in a vacuum furnace is the best way to process this alloy. After vacuum distillation of more than 99% of metallic zinc, the resulting slag is mainly ferroalloy...