Method for directly producing mineral cotton with hot-melted titanium-containing blast furnace slag

Abstract

The invention discloses a method for directly producing mineral cotton with hot-melted titanium-containing blast furnace slag. The method comprises the steps of introducing the hot-melted titanium-containing blast furnace slag with an acidity coefficient higher than 1.1 and a viscosity coefficient higher than 0.5 Pa.S into a slag ladle; simultaneously blowing coal gas to perform treatments of thermal insulation and homogenization for the hot-melted titanium-containing blast furnace slag in the slag ladle; and then centrifuging or blowing the treated hot-melted titanium-containing blast furnace slag to obtain mineral cotton fibers. Water consumption in a water-quenched slag process can be prevented, because the method is in no need of water-quenching the melted slag to a solid state, so that water can be saved effectively; and pollutions to atmosphere and surface water can be prevented. With the method, most of sensible heat of the blast furnace melted slag can be utilized effectively, thereby saving fuels effectively. Production cost can be reduced and production period is shortened because of omitting a reformulating process for adjusting the acidity of the melt by adding silica. The method has the characteristics of water conservation, energy conservation, environmental protection, low cost and simple and fast process, and realizes the integrated utilization of solid resources of the titanium-containing blast furnace slag.

Description

technical field [0001] The invention relates to a method for utilizing blast furnace slag, in particular to a method for directly producing slag wool by using hot-melted titanium-containing blast furnace slag. Background technique [0002] Blast furnace slag is an accessory produced when smelting pig iron. Ordinary blast furnace slag can be used as raw materials for cement raw materials, road construction or foundation backfill materials, concrete aggregates, etc., but they are all used in a cold state with low added value; Vanadium-titanium blast furnace slag is not conducive to the solidification of cement and affects the overall strength and stability of concrete, resulting in a low utilization rate of cement. Therefore, a large amount of vanadium-titanium blast furnace slag stockpiled has become a bottleneck for the development of enterprises. [0003] Generally, non-vanadium-titanium ordinary blast furnace slag is generally alkaline slag, and its acidity coefficient is ...

AI Technical Summary

Problems solved by technology

Disadvantages of this process: Fuel coke is required for secondary smelting of cold blast furnace slag through the cupola, and the amount of coke consumed per ton of slag wool is about 250kg

Coke is obtained by conversion of raw coal. To produce 1 ton of coke, 1.25 to 1.35 tons of raw coal is consumed, and the energy loss in the process is about 20%, and at least 20% of the energy is lost after smelting the blast furnace slag in the cupola, so the cupola is used Secondary smelting of blast furnace slag will result in a serious waste of energy; in addition, the use of cold blast furnace slag for smelting, the sensible heat (1450°C) of molten slag flowing out of the blast furnace is not used, while the temperature of blast furnace slag is changed from 1400°C The heat (sensible heat) released when cooled to room temperature is about 1550-1750kJ / kg, that is, the heat released per ton of blast furnace slag is equivalent to 52.97-59.80kg of standard coal

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