Ferrosilicon 65

65 Ferrosilicon is mainly an iron alloy composed of iron and silicon. Since silicon and oxygen are easily combined into silicon dioxide, ferrosilicon is often used as a deoxidizer in steelmaking. The oxidation reaction itself is an exothermic reaction. Can increase the temperature of molten steel. At the same time, ferrosilicon can also be used as an alloying element additive, which is widely used in low-alloy structural steel, spring steel, bearing steel and electrical silicon steel. At the same time, ferrosilicon is often used as a reducing agent in ferroalloy production and chemical industry. The production of ferrosilicon is based on natural silica as raw material, using metallurgical coke as reducing agent and adding a certain amount of iron-containing materials for smelting. In order to ensure the permeability of mineral materials when using this process to produce 65 ferrosilicon, the particle size of silica and coke particles They are relatively large, the particle size of silica is generally 60-120mm, and the particle size of coke particles is generally 5-22mm. The metallurgical methods of nickel are divided into two categories: fire method and wet method. The production of nickel in my country mainly adopts the fire method of nickel sulfide ore. The production processes used are electric furnace smelting, flash furnace smelting and blast furnace smelting. The rapid furnace smelting process is relatively advanced. Using the flash furnace smelting method to produce 1 ton of nickel discharges about 6 to 16 tons of slag. Jinchuan Group alone discharges nearly 800,000 tons of nickel slag every year, and uses about 100,000 tons per year. The rest is accumulated in the company's slag yard. Has reached 10 million tons. If a large amount of nickel slag is piled up arbitrarily without treatment, it will not only occupy a lot of land, but also pollute the environment. Therefore, it is necessary to comprehensively utilize the nickel slag. The main components of nickel slag are iron oxides and silica, and the main phases are fayalite and pyroxene phases, which are important raw materials for the production of 65 ferrosilicon. Therefore, the technology of directly using nickel slag as raw material to produce 65 ferrosilicon remains to be explored.

Using nickel slag to replace steel scraps and partially replace silica to smelt 65 ferrosilicon not only reduces the production cost of ferrosilicon, but also avoids the pollution of nickel slag to the environment. (1) carrying out a mixed treatment of nickel slag, silica and carbonaceous reducing agent to obtain a mixed material; (2) carrying out a smelting treatment of the mixed material to obtain a mixed melt of silicon-containing molten iron and ferrosilicon slag; and (3) The slag-iron separation is performed on the mixed melt of the molten iron containing silicon and the ferrosilicon slag, so as to obtain a ferrosilicon alloy product. By making full use of the iron oxides and silica in the nickel slag, the nickel slag can replace the steel scrap and partially replace the silica to smelt ferrosilicon, thereby reducing the production cost of ferrosilicon, and realizing the waste utilization of the nickel slag and avoiding the nickel slag. polluted environment. The mass fraction of total iron in the nickel slag is not less than 30%. Thereby, the ferrosilicon grade can be significantly improved. The mass fraction of silica in the silica is not less than 95%. Thus, the grade of 65 ferrosilicon can be further improved. The fixed carbon content in the carbonaceous reducing agent is not less than 75%, and the ash content is not more than 15%. Thereby, the ferrosilicon grade can be further improved. The carbonaceous reducing agent is blue carbon or coke. Thus, the grade of 65 ferrosilicon can be further improved. The nickel slag, the silica and the carbonaceous reducing agent are mixed according to a mass ratio of 100:(120-140):(70-100). Thereby, the ferrosilicon grade can be further improved. The temperature of the smelting treatment is 1700 to 2000° C., and the time is 0.5 to 2 hours. Thereby, the ferrosilicon grade can be further improved. The smelting treatment is carried out in a submerged arc furnace. Thus, the grade of 65 ferrosilicon can be further improved. 65 Ferrosilicon is a ferrosilicon ingot or molten iron containing silicon. The nickel slag, silica and carbonaceous reducing agent are mixed to obtain a mixed material. Nickel slag contains a large amount of iron oxides and silicon dioxide. Using nickel slag to replace steel scraps and partially replace silica to smelt ferrosilicon can significantly reduce the production cost of ferrosilicon.