A process for continuous upgrading of high-temperature slag

Abstract

The invention discloses a high-temperature slag continuous modification processing method, and belongs to the technical field of industrial waste comprehensive utilization technologies. The method includes the following steps: when the high-temperature electric furnace slag is discharged, a matched modifier is continuously fed through a powder delivery system, so that the modifier and the slag can be concurrently discharged and enter a slag ladle; the slag is uniformly mixed with the modifier due to the thermal shock stirring of the slag, so that the modification of the slag in the slag ladle is realized, and no external heat is required to be supplemented; the high-temperature slag refers to the melt steel slag discharged during the electric steelmaking process, or the melt reducing slag discharged during the smelting process of a small-sized electric furnace, or the high-temperature slag discharged continuously during other smelting processes; the mass ratio of the high-temperature slag to the modifier is not smaller than 2; in the modifier, the high-silicon aluminum raw material accounts for 70-100%, and the carbonic raw material accounts for 0-30%; the particle size of the modifier is smaller than 25 mm. The slag provided by the invention is high in temperature, low in alkalinity, small in viscosity and good in fluidity; a smaller amount of the modifier needs to be added, the modification is easy, no supplementary heat is required, the modification cost is low, the waste containing silicon-aluminum, carbon and iron can be used as a part of the modifier, so that the resource utilization of waste is realized.

Description

technical field [0001] The invention relates to a process method for continuous upgrading of electric furnace slag, in particular to a method for upgrading high-temperature slag discharged from the electric furnace steelmaking process by using bulk and cheap high-silicon aluminum industrial raw materials and carbon-containing industrial waste at the source through automatic equipment , so as to achieve the purpose of controlling the composition and structure of metallurgical slag at low cost, and belongs to the technical field of comprehensive utilization of industrial waste. Background technique [0002] With the development of China's social economy, the iron and steel industry is a national key basic industry, and its steel output has increased from 630 million tons in 2010 to 780 million tons in 2013. Calculated by calculating that steel slag accounts for 15% to 20% of steel output, the national The total annual output of steel slag can reach more than 100 million tons, ...

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Problems solved by technology

[0005] The above methods of steel slag modification have the following problems: the slag removal process of the converter is dumping, and the slag removal time is short, and it is difficult for most modifiers and slag to mix evenly in a short time; Furnace process, the temperature of the slag decreases and the alkalinity increases, resulting in insufficient heat when it is mixed with the modifier, and the viscosity increases rapidly

[0006] Although currently about 90% of domestic steelmaking is done by converters, with the rapid development of China's economy, iron and steel smelting will enter the stage of recycling, and the main source of steelmaking raw materials will change from molten iron to scrap steel; at the same time, ordinary carbon steel can no longer meet the requirements People's daily needs, special steel will develop rapidly

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