Method for preparing high-strength slag wool through direct fibrosis of blast furnace slag

Abstract

The invention discloses a method for preparing high-strength slag wool through direct fibrosis of blast furnace slag. Efficient utilization of sensible heat of the slag is achieved. Molten slag is firstly pretreated in a rotary kiln in a nitrogen atmosphere, pure metal elements or non-metal elements, such as silicon, in the slag react with nitrogen at a high temperature to generate nitrides with very good hardness and heat stability, so that the strength of the slag wool can be improved and rupture is prevented. In addition, a texturizer prepared by compounding nano-zirconia, rare earth tailings, quartz sand and other raw materials has good toughening and crystal structure refining effects, the fiber forming property of the slag can be significantly improved, the properties, such as the length, the strength, the shot content and the moisture content stability, of prepared fiber are effectively improved, and high-value and high-efficiency direct recycling of the molten slag is achieved.

Description

technical field [0001] The invention relates to the technical field of slag application, in particular to a method for preparing high-strength slag wool by directly fibrating blast furnace slag. Background technique [0002] my country's iron and steel industry has produced a large amount of solid waste through the rapid development of the early stage, and blast furnace slag occupies a considerable proportion of these wastes. At present, blast furnace slag is generally processed by water quenching to produce cement and concrete, but a large amount of water resources will be wasted in the process of processing, and a large amount of waste gas and waste water will be generated at the same time, causing secondary pollution; the second is to produce slag admixture, but the product additional lower value. It can be seen that in the face of such a large reserve of industrial waste, it is particularly important to explore efficient treatment and comprehensive utilization methods. ...

AI Technical Summary

Problems solved by technology

The article "Preparation of Slag Wool by Direct Fibrillation of Blast Furnace Slag" discloses a method of directly forming fibers by mixing liquid blast furnace slag and iron tailings and then using the injection method and four-roller centrifugal method to realize the sensible heat of slag. However, the fiber-forming rate of mineral wool prepared by the injection method is low, the content of slag balls is high, and the fibers are short and brittle. Although the four-roller centrifugation method obtains relatively long and thick fibers, its moisture content is relatively high. , easy to powder and brittle, unable to meet the performance index requirements of the demand industry, resulting in obstacles to the conversion and utilization of slag, and overcapacity in the industry