Zinc sulfide concentrates is one of the main raw material of the zinc smelting, roasting and sometimes as much as possible to remove all the sulfur, as well as lead, cadmium, arsenic, antimony volatilization as completely as possible, often need zinc sulfide concentrates.

zinc concentrate plant

zinc concentrate plant

The roasting process of zinc sulfide concentrate by means of the oxygen in the air oxidation process at high temperatures. This is a complex process, the existence of gas – solid reactions, solid – solid reactions and solid – liquid reaction; In addition to general aspects of the chemical, including adsorption, desorption, diffusion and external diffusion and the formation of physical links and nuclei, phenomenon of a new phase of growth, and chemical and crystal changes. In addition, calcination, there will be a stable intermediate compounds and a variety of silicates, iron salts, sulfate, and so on.

At present, the roasting of zinc sulfide concentrates more than the roasting of the fluidized bed furnace. Roasting air blowing solid charge layer from the bottom up to a certain speed, the solid charge particles by the wind separated from each other, and for non-stop complex movement, the movement of particles in suspension, its status as the boiling of water , so called roasting. Under normal circumstances, the boiling roaster bed temperature up to 850-1150 ° C, the furnace heat capacity and uniform. The solid particles can be a long time in a suspended state, fast response, high efficiency heat and mass transfer, the temperature is small, the material particles and air contact time, so that the roasting process greatly enhanced.

The roasting process generally includes four parts of the charge preparation and feeding system, the furnace body system, dust collection and gas treatment system and discharge system. The charge to prepare the ingredients, drying, crushing and screening. Boiling roaster feeding dry feed and wet feed two. Proceeds of roasted ore roasting since the boiling layer overflow discharge port after discharge, the use of the cooling cylinder for cooling. The roasted ore can be used wet and dry two transportation methods.

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