Medium-density forsterite sand and preparation method thereof

Abstract

The invention relates to medium-density forsterite sand and a preparation method thereof. The technical scheme is as follows: the preparation method comprises the following steps: lightly sintering 85wt% to 93wt% of magnesite tailings for 0.5 to 5 hours at the temperature of 1200 to 1350 DEG C; mixing and grinding with 7wt% to 15wt% of quartz sand to obtain a lightly-sintered tailing-quartz mixed material of which the particle size is smaller than 0.088mm; sequentially adding 5wt% to 40wt% of a hole forming agent and 3wt% to 12wt% of a binding agent based on the mixed material; mixing; smelting; mechanically compressing and drying at the pressure of 110MPa to 150 MPa; roasting for 4-9 hours at the temperature of 1650 to 1720 DEG C to obtain medium-intensity forsterite which has high temperature stability of volume. The medium-intensity forsterite which is high in fire resistance and good in heat insulation property and prepared by taking the lightly-sintered tailings and the quartz sand as raw materials, has low heat conductivity and high temperature stability of volume; a composite brick for a kiln, prepared from the medium-intensity forsterite, is resistant to high temperature, resistant to corrosion, good in thermal shock resistance, long in service life and good in energy-saving effect.

Description

technical field [0001] The invention belongs to the technical field of refractory materials, and in particular relates to a high-temperature volume stable medium-density forsterite sand and a preparation method thereof. technical background [0002] The cement industry is a well-known large energy consumer and also a large emitter of carbon dioxide. In the heat consumption of cement, the surface heat dissipation loss accounts for about 10%, reaching 70kcal / kg. Among them, the kiln body heat dissipation accounts for about 50% of the total heat dissipation, the kiln tail preheater and calciner account for about 35%, and the tertiary air duct and cooler account for about 15%. At present, my country is planning the second generation of new dry process cement production technology to reduce the heat consumption of clinker from 700 to 750kcal / kg to about 650kcal / kg, that is, to reduce the heat consumption by 50 to 100kcal / kg; Effectively reducing heat loss will make a great contr...

AI Technical Summary

Problems solved by technology

In the cement industry, there are also composite bricks whose thermal insulation layer is heavy forsterite, whose thermal conductivity is 1.7w / mk. Heavy forsterite bricks have high strength and low heat insulation, while light forsterite bricks have insulation High heat but low strength

At present, although there is a synthesis of medium-density forsterite sand, its apparent porosity is high, there are many pores, and the volume stability at high temperature is not good, so it cannot be combined with dense materials with good high temperature resistance to make bricks.

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