Method for preparing inorganic fibers by using direct blowing of blast furnace molten slag

Abstract

The invention discloses a method for preparing inorganic fibers by using direct blowing of blast furnace molten slag, and belongs to the field of inorganic nonmetallic material preparation. The method comprises the following steps: conveying high temperature molten slag generated in a blast furnace to a high temperature quenching and tempering furnace through a slag groove, adding a quenching and tempering agent so as to carry out high temperature quenching and tempering on liquid molten slag, and carrying out direct blowing on the quenched and tempered blast furnace slag by adopting a direct blowing device so as to produce the inorganic fibers. The method comprises two critical processes of online dynamic quenching, tempering and homogenizing, and direct blowing for fiber formation; and in the production process, two sets of quenching and tempering systems alternatively work, the other set of system is used for molten slag pouring for fiber formation while one of the two sets of system is used for quenching and tempering, so that the continuity of the direct blowing fiber formation process is ensured. The method has the advantages that the direct blowing device is used for blowing the inorganic fibers, and the shortcomings of complexity, high requirements on operating personnel, water cooling, high energy consumption and the like existing in a conventional centrifugal fiber formation system device are overcome; meanwhile, the sensible heat of the blast furnace molten slag is directly utilized, so that the reasonable utilization of industrial raw materials and waste energy sources can be realized and has important significance.

Description

Technical field: [0001] The invention relates to a method for directly forming fibers from blast furnace slag, which belongs to the field of preparation of inorganic non-metallic materials. Background technique: [0002] Blast furnace slag is the main by-product of the iron and steel smelting process. Every ton of pig iron can produce 300-350kg of blast furnace slag. The slag discharge temperature is above 1400°C. Each ton of slag contains heat equivalent to 60kg of standard coal. At present, in my country, hot slag is directly granulated by water quenching for the production of cement and concrete; secondly, slag aggregate is produced, and a small amount of blast furnace slag is remelted to produce expanded beads and slag wool. The comprehensive utilization rate is about 85%. . [0003] In the 1950s and 1960s, my country began to study the technology of preparing slag wool from blast furnace slag, but at that time, the cooled blast furnace slag was used, and the heat of 60k...

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Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the production process of producing mineral wool fibers from blast furnace slag does not match the connection of the process of blast furnace slag discharge. During the slag discharge process of the blast furnace, the two sets of quenching and tempering systems can be operated alternately through the swing nozzle, so as to ensure the continuous operation of the subsequent fiber forming device and maximize the production capacity of the equipment

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