Method and device for producing mineral wool with molten blast furnace slag and mine tailings

Abstract

The invention relates to a method for producing mineral wool by matching molten-state blast furnace slag with mine tailings. Molten-state blast furnace slag is taken as a raw material, the mine tailings are taken as a quenching and tempering agent, two stages of electric furnaces are adopted for heating, a nitrogen spraying and blowing system is arranged at the bottom of each furnace, magma after refinement, homogenization, quenching and tempering is thrown into mineral wool filaments of 3-5 microns by a centrifuge, and a mineral wool product is obtained after being collected by a wool collecting machine. A device for implementing the method comprises the electric furnace I, the electric furnace II, the centrifuge and the wool collecting machine which are sequentially connected. Compared with the prior art, the method and the device provided by the invention have the following beneficial effects that 1) the potential heat energy of the molten-state blast furnace slag is effectively utilized; 2) the shortcomings of high energy consumption and high pollution of a cupola furnace are avoided; 3) the mine tailings are selected as the quenching and tempering agent, so that the operation cost is reduced, the waste of resources is avoided, and the difficult problem of treatment of the mine tailings is effectively solved; 4) the quenching and tempering effect is strengthened and the quenching and tempering of a melt is more uniform; and 5) the acidic system after quenching and tempering is 1.0-2.2, and external heat preservation mineral wool products for exterior walls for buildings can be produced.

Description

technical field [0001] The invention relates to the technical field of metallurgical slag utilization and mineral wool production, in particular to a method and device for producing mineral wool with molten blast furnace slag and mine tailings. Background technique [0002] Slag cotton is made of industrial slag as the main raw material, and is added with inorganic fibers made of other materials through remelting and fibrosis. It can be made into various products such as boards, pipes, and felts. , Moisture resistance, sound absorption, earthquake resistance and many other functions, widely used in construction, industrial equipment and vehicles and other fields, such as building exterior wall insulation, interior wall fire and sound insulation, industrial kiln and pipeline insulation, ship heat insulation, etc. [0003] Most of the existing mineral wool production processes use slowly cooled blast furnace slag as the main raw material, and add a certain amount of quartzite ...

AI Technical Summary

Problems solved by technology

[0004] The process of using cupola to make slag wool has the following disadvantages: (1) It consumes a large amount of coke, coal, oil and other resources to convert into heat energy, and every ton of mineral wool needs to consume 0.6 tons of coke, which is equivalent to 0.7 tons of standard coal, Will produce nearly 1 ton of CO2, thus causing great pollution to the environment

(2) Since the raw material used in the existing technology is blast furnace heavy slag after slow cooling into blocks, it is necessary to send the molten blast furnace slag discharged from the blast furnace to the cupola for remelting after slow cooling into blocks, thus wasting the molten state The large amount of sensible heat of blast furnace slag also increases the production cost

(3) The quality of the produced products is poor and easy to pulverize. It is only suitable for industrial insulation and cannot meet the requirements of mineral wool for external wall insulation in buildings.

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