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The solvent method is a method used by high-carbon ferrochrome manufacturers to smelt high-carbon ferrochromium. In addition to chromium ore and coke, the charge composition also includes lime. During smelting, high-alkalinity slag is used to operate the alkalinity, B=1.3-1.4. Use sufficient reducing agent to minimize the chromium content in the waste residue and increase the recovery rate of chromium.
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Flux-free method. For chromium-rich ores containing higher chromium oxide, high-carbon ferrochrome manufacturers can use the flux-free method to smelt ferrochromium. Lime is not added to the charge during smelting. The equipment and operation are similar to ferrosilicon, and it is used when the reducing agent is insufficient. Using acidic slag operation under the conditions, the process of smelting high-carbon ferrochrome by solvent-free method is continuous. The charge is continuously added into the furnace along with the melting process. The unit power consumption of the product is very low, and it is easy to produce low-silicon high-carbon ferrochrome. , this is because most of the silicon is enriched in the slag.
charge chrome
The solvent-less method uses the so-called "weakly acidic slag method" between the solvent method and the solvent-free method. This method is to add an appropriate amount of lime or limestone to the furnace charge to control the ratio of the slag basicity m (CaO)/m (SiO2) or m (CaO+MgO)/m (SiO20) between 0.6-0.8. It can not only improve the recovery rate of chromium, but also obtain slag containing 25%~30% chromium and an appropriate amount of CaO.
