Zinc leaching slag treatment method

Abstract

A zinc leaching slag treatment method comprises the following steps: 1) The dried zinc leaching slag is evenly mixed with coke powder, and then the mixture is added to a volatilization kiln through a feeding scraper-trough conveyer at the tail of the kiln; 2) under the high-temperature condition of the volatilization kiln, the mixture generates kiln slag and smoke, valuable metals in the zinc leaching slag are deoxidize, as a result, lead and zinc steam is generated and gathered in the smoke, and gold, silver and copper enters to the kiln slag; 3) the kiln slag is delivered to a smelting furnace, furnace burden is added from the top of the smelting furnace, oxygen-enriched air is blown through an oxygen lance, the furnace hearth is stirred, the smelting temperature of the smelting furnace and the ratio of oxygen quantity to kiln slag dry measure are controlled, and slagging smelting is completed; 4) after the slagging smelting carried out in step 3), the valuable metals gold, silver and copper in the kiln slag are gathered in matte, the generated lead steam is gathered in smoke, and the kiln slag is cooled gradually. According to the zinc leaching slag treatment method, the technological process is short, the energy consumption is low, the cost is low, and the valuable metal recovery rate is high.

Description

technical field [0001] The invention relates to the technical field of nonferrous metal smelting, in particular to a method for treating zinc leaching slag. Background technique [0002] With the increasing depletion of mineral resources, the development and utilization of renewable resources (such as tailings, smelting slag, etc.) is imminent, and the comprehensive utilization of renewable resources is also an important way to achieve sustainable development. The leaching slag produced by the hydrometallurgy zinc smelting plant is strongly acidic. If no measures are taken to deal with it, it will not only occupy a large amount of land resources and cause serious environmental pollution, but also contain high copper, gold, lead, zinc, Valuable metals such as silver cannot be effectively recovered, resulting in a great waste of resources. Therefore, it is imperative to recycle zinc leaching slag and extract the valuable metals therein. [0003] The treatment methods of leac...

AI Technical Summary

Problems solved by technology

[0004] CN 102399995 A discloses a method for extracting zinc and lead oxide from a zinc slag volatilization kiln. The smelting method described in the invention is to extract zinc and lead oxide by using a volatilization kiln for oxygen-enriched combustion, using coal as a reducing agent, and adding slaked lime during the volatilization process. Oxygen is introduced into the gas mixing link, and oxygen is mixed in the gas mixing tank at the kiln head, which improves the combustion conditions of the volatilized kiln carbon, reduces fuel consumption, and increases the volatilization rate of metals. However, this method only increases the enrichment of zinc, lead, and iron. The concentration of gold, silver, copper and other metals cannot be effectively enriched

[0005] CN 101985695 A discloses a method for treating zinc leached slag with a high proportion of an oxygen bottom-blown furnace. By using the characteristics of an oxygen bottom-blown furnace to strengthen smelting, the heat balance of smelting is maintained by adding sulfide, and the oxidation atmosphere is precisely controlled to make the high-ratio The imported zinc leaching slag can complete chemical reactions such as decomposition, desulfurization, and slagging in the oxygen bottom-blown furnace, so that valuable metals such as Pb, Zn, Cu, Ag, S, etc. in the zinc leaching slag can be recovered. However, in this method, The zinc leaching slag mentioned above is lead-silver slag with a zinc content of 5%, rather than a zinc leaching slag with a zinc content of 20-23%. If the melting point of slag is too high, the lead smelting plant will not be able to produce normally; and there are many processes, resulting in higher costs

[0006] CN 102321806 A discloses a smelting method for treating zinc leaching slag with an oxygen-enriched side-blowing furnace. The smelting method described in the invention is to use an oxygen-enriching side-blowing furnace to treat zinc leaching slag, use crushed coal as a reducing agent, and measure the leaching slag with zinc After the ratio is added to the oxygen-enriched side-blowing furnace for smelting and fuming, the present invention can effectively recover valuable metals such as zinc, silver, indium, lead, copper, etc. However, when zinc leaching slag is smelted, the oxygen concentration of the oxygen lance and the melting The high temperature requirement will increase the energy consumption of the smelting process, and the high content of zinc will cause the viscosity of the slag in the side blowing furnace to rise sharply, and even the normal production cannot be achieved.