Rotary kiln calcining process of laterite nickel ore

Rotary kiln calcining process of laterite nickel ore: in the smelting of laterite nickel ore, blast furnace smelting laterite nickel ore process has serious environmental pollution, low recovery rate of nickel, high energy consumption, large investment in unit nickel production, and high impurity of product. With the rise in the price of red nickel ore, the implementation of national environmental protection and energy conservation policies, this process will automatically withdraw from the market competition. The metallurgical RKEF process replaces the blast furnace smelting process and is commonly used in the smelting of nickel ore. Its basic process: preparation of ore treatment and reducing agent - rotary kiln calcination - hot loading into the submerged arc furnace smelting - desulfurization of crude nickel iron - removal of silicon, phosphorus and carbon in the converter, sulfur, manganese and other impurities - refined nickel iron ore cast block, the other need to build recycling and the usage of converter slag in the iron and nickel workshop.

Ore was sent into the raw material field, by the broken, and the mixture, with the reducer into the rotary kiln. Rotary kiln work area can be divided into three sections, namely the drying section, heating section, roasting section. In the rotary kiln, the ore is roasted and dehydrated, and the weight is reduced by about 30%. At the same time, nickel oxide and some iron are reduced by the reducing agent in the charge. In the rotary kiln discharge side with a sealed discharge device, nickel slag to 600 ~ 900 ℃ temperature in the insulated state was sent to the submerged furnace insulation feeding silo, and then through a sealed tubular fabric device, evenly distributed within the submerged arc furnace. Depending on the treatment of the charge, the rotary kiln has a different diameter and length ratio. The kiln structure of the rotary kiln is important to effectively adjust the length and stiffness of the flame to ensure that the temperature of the three working zones in the furnace is within the scope of the process requirements. In addition, we should fully consider the usage of rotary kiln flue gas drying charge to energy saving.

The material of rotary kiln after weighing, in the hot state was charged into the submerged arc furnace. The feeding system of the submerged arc furnace needs to meet the needs of hot charging. Hot pack is very important, in addition to the recovery of physical heat, but also to ensure that the material in the transport process is not secondary oxidation. For environmental protection, industrial hygiene, recovery of dust, recovery of gas, submerged arc furnace is sealed up.

Our company produces calcination a variety of materials rotary kiln, such as cement rotary kiln, lime rotary kiln, magnesium rotary kiln, ceramic sand rotary kiln, laterite nickel ore rotary kiln and so on. ZK brand rotary kiln with high energy low consumption, good temperature performance, smooth operation, out of the kiln products has high quality characteristics.