Preparation method of forsterite refractory brick prepared from nickel-iron slag

Abstract

The invention discloses a preparation method of a forsterite refractory brick prepared from nickel-iron slag. The nickel-iron slag is used as a raw material, and fine magnesite powder is added; the generation amount of a liquid phase in a firing process is controlled by regulating and controlling the mass ratios of all components, so that the volume density and the compression strength of the refractory brick are improved, and the sintering temperature is reduced; the mass ratios of all the components are controlled to meet the following conditions that the mass ratio of MgO to SiO2 is 0.98 to 1.67, the mass ratio of MgO to FeO is 5.87 to 7.71, the mass ratio of MgO to Al2O3 is 11.23 to 17.6, the mass ratio of Al2O3 to SiO2 is 0.087 to 0.095, and the sum of MgO and CaO to the sum of SiO2 and Al2O3 is 0.95 to 1.59; meanwhile, the preparation method comprises the following steps: additionally adding water and a binding agent, uniformly mixing, and carrying out compression moulding and drying treatment; after treatment, roasting at the temperature of 1200 to 1350 DEG C for 2 to 3.5 hours; adopting an oxidizing atmosphere in the firing process, thus obtaining the forsterite refractory brick. The preparation method disclosed by the invention has the advantages of high resource utilization rate, environment friendliness, simple process, low production cost and the like; the forsterite refractory brick prepared from the nickel-iron slag has the advantages of high compression strength, high volume density, low porosity and good thermal shock resistance.

Description

technical field [0001] The invention belongs to the field of refractory materials, and in particular relates to a preparation method of forsterite refractory bricks prepared by using nickel-iron slag Background technique [0002] Forsterite is a weakly basic refractory material with high strength, high melting point, good chemical and mineral stability, low thermal conductivity, and good compatibility with most basic refractory materials, so it is widely used. In metallurgy, thermal and foundry industries. The compressive strength of the existing forsterite refractory brick is 22.6-51MPa, the apparent porosity is 17.2-22.1%, and the bulk density is 2.43-2.67g / cm 3 . At present, the raw materials for forsterite refractories mainly include natural forsterite and synthetic forsterite using magnesia and siliceous raw materials. Because natural forsterite is difficult to directly fire refractory bricks, and natural forsterite contains a lot of iron, calcium, aluminum and other...

AI Technical Summary

Problems solved by technology

Simple stockpiling and landfilling not only take up a lot of land resources, but also bring serious environmental pollution. Sustainable development without using ferronickel smelting

However, ferronickel slag has high magnesium and silicon content and low calcium content, which leads to a very low dosage of it in cement and concrete. The amount of ferronickel slag used is small and the added value is low.