Zinc Leaching Slag Treatment
In the industrial process of zinc smelting, zinc coated slag is generated, which contains valuable minerals and materials. The effective use of slag is an important issue in the zinc smelting process. The traditional treatment of zinc leaching slag is mainly grinding, dressing and leaching, which has the disadvantages of low leaching efficiency, low quality of raw materials and difficult process control. In recent years, physical and chemical methods are developed to further process zinc slag.
Physical processing of zinc leaching slag mainly includes mechanical crushing, magnetic separation, and flotation. The mechanical process can separate the slag according to its granule size, or separate the unwashed slag from the washed slag, but the enrichment effect is limited for zinc slag; Magnetic separation can be used to separate magnetic minerals from zinc slag, but this method also has limitations; Flotation can use mixed collectors to selectively float out the valuable minerals from zinc slag, and obtain qualified copper concentrate after further concentrate processing.
Chemical leaching is a new method of zinc leaching slag treatment, which has the advantages of low energy consumption and simple process flow. Acid leaching technology utilizes the differences of components between zinc slag and minerals to realize the physical separation of minerals and slag, so as to extract useful components of zinc slag. In this process, the amount of acid used depends on the mineral composition of the slag; The leaching temperature also affects the leaching efficiency, and the leaching time is generally 6-48 hours; The leaching liquid also needs to be recycled and reused to reduce costs.
In summary, zinc leaching slag treatment covers several fields such as physical processing and chemical leaching. Compared with traditional methods, the new method has obvious advantages, such as low energy consumption, simple process flow and high leaching efficiency, which provides reference and basis for the subsequent development of mineral processing technology.
