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Method for refining chrome iron powder

2019-11-13
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Medium-, low-, and micro-carbon ferrochrome powders are usually made of silicon-chromium alloy, chromite, and lime. They are desiliconized with an electric furnace of 1500 to 6000 kVA, and operated with high-basicity slag (CaO / SiO2 is 1.6 to 1.8) . Refractory grade chromite, low- and micro-carbon ferrochrome are also selected for heat production in a planned way. At the time of production, two electric furnaces were used. One furnace was used to train silicon chromium alloys, and the other furnace was used to melt slag composed of chromium ore and lime. The essence of the reaction is carried out in two tanks in two periods: ① the slag of the slag furnace is written into the first, and after one tank, the silicon chromium alloy that has begun to desilicate in the other tank is added, Excessive amount of slag oxidant, sufficient desiliconization, can obtain micro-carbon ferrochrome containing less than 0.8% silicon and carbon as low as 0.02%. ② First, after the reaction slag (containing about 15% of Cr2O3) in the first container is transferred to the second container, the silicon-chromium alloy (containing 45% silicon) smelted from the silicon-chromium electric furnace is heat exchanged into the slag. After the reaction, a silicon-chromium alloy (containing about 25% of silicon) with desiliconization at the beginning is obtained, which is further desiliconized in the first barrel. The slag containing Cr2O3 below 2 to 3% can be discarded.



The oxygen blowing method is the essence of medium and low-carbon ferrochrome. Liquid carbon ferrochrome is used as the material. During the smelting process, a small amount of lime and fluorite are slag-making in the molten pool. Silicon-chromium alloy or ferro-silicon is added before iron extraction to recover chromium. The blowing of micro-carbon ferrochrome is only possible under a certain vacuum degree.


The essence of vacuum solid-state decarburization method, using ground high-carbon ferrochrome as a material, a part of the ground high-carbon ferrochromium is oxidized and roasted as an oxidant, mixed with water glass or other binders, pressed into agglomerates, and subjected to low temperature After drying, heat recovery in a car bottom vacuum furnace at a vacuum degree of 0.5 to 10 mm Hg and a temperature of 1300 to 1400 ° C for 35 to 50 hours can obtain microcarbons with a carbon content of less than 0.03% or less than 0.01%. Ferrochrome.


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