High-performance forsterite refractory raw material and preparation method thereof

Abstract

The invention relates to a high-performance forsterite refractory raw material and a preparation method thereof. The method comprises the following steps: mixing 65-85 weight percent of fine magnesite powder with 15-35 weight percent of siliceous raw material fine powder, adding 1-10 weight percent of binding agent, and ball-milling for 1-3 hours to obtain a ball-milling material; then adding water being 3-10 weight percent of the ball-milling material into the ball-milling material, stirring, pressing to form a blank body, drying, and calcining at 1200-1400 DEG C to obtain a calcining material; grinding the calcining material to the particle size smaller than 0.045mm, and adding an additive being 0.2-2 weight percent of the calcining material and the binding agent being 1-10 weight percent of the calcining material, and ball-milling to obtain a secondary ball-milling material; and adding 3-10 weight percent of water into the secondary ball-milling material, stirring, pressing to form a blank body, drying, and secondary calcining at 1450-1650 DEG C to obtain the high-performance forsterite refractory raw material. The raw material has the advantages of wide sources, low production cost and easiness in sintering, and the prepared high-performance forsterite refractory raw material has large volume density, low porosity and stable high temperature properties.

Description

technical field [0001] The invention belongs to the technical field of refractory materials. In particular, it relates to a high-performance forsterite refractory raw material and a preparation method thereof. Background technique [0002] Forsterite crystal has a melting point of 1890°C and is an island silicate structure. It has excellent characteristics such as high melting point, low thermal conductivity, stable chemical properties, and high corrosion resistance to metal melts and slag. However, the impurity content of natural forsterite is not only high but also has a large loss on ignition, even after high-temperature calcination, it still cannot meet the requirements of high-grade refractory products. Fe contained in natural forsterite 2 o 3 , SiO 2 、Al 2 o 3 Such impurities will form low-melting materials in minerals or at high temperatures, such as fayalite, forsterite, diopside, anorthite, cordierite, etc., which will reduce the refractoriness and load soften...

AI Technical Summary

Problems solved by technology

However, the impurity content of natural forsterite is not only high but also the loss on ignition is large, even after high-temperature calcination, it still cannot meet the requirements of high-grade refractory products

Fe contained in natural forsterite 2 o 3 , SiO 2 、Al 2 o 3 Such impurities will form low-melting materials in minerals or at high temperatures, such as fayalite, forsterite, diopside, anorthite, cordierite, etc., which will reduce the refractoriness and load softening temperature of the product ; Due to the existence of impurity components, a variety of mineral phases coexist, resulting in the instability of refractory products at high temperatures, which seriously affects the production of refractory materials and the promotion of refractory products

[0003] There are also some methods for preparing forsterite in the prior art, but there are certain deficiencies: such as using serpentine tailings as the main raw material (Wan Jiandong, Donghai County Serpentine tailings are converted into forsterite research. Non Metal Ore, 1997, 3: 61-63), the dense forsterite raw material was obtained through fine grinding, molding and firing, but due to the 2 o 3 The higher content of impurities such as magnesite and CaO will lead to the instability of the high-temperature properties of the prepared forsterite, which limits its application in refractory products; "Method" (201110159148) patented technology, using magnesite tailings and talc tailings as the main raw materials, adding additives and binders, through the processes of batching, mixing, molding, drying, high-temperature synthesis and crushing to obtain high-temperature At 1600°C, the bulk density is greater than 2.55g / cm 3 High-purity forsterite refractory raw material, but the raw materials and products used in this technology contain a certain amount of iron oxide, which will affect the use effect of the final product at high temperature. Due to the limitation of the preparation method, this technology cannot produce high-density forsterite Stone, for example, under the premise of ensuring excellent high temperature performance, the bulk density is greater than 2.9 g / cm 3 Dense forsterite; Another example is the patented technology of "Method for producing forsterite refractory material with iron tailings" (ZL200610047981), in which olivine clinker and burnt matter are added to the mixture of iron tailings and lightly burned magnesium powder , binder and water, after stirring, forming, drying, heat preservation and firing, the forsterite refractory material is obtained. The raw material used in this technology has a relatively high content of iron, which will significantly affect the high temperature performance of the product, and thus cannot Long-term use in a high-temperature environment in contact with erosive media, reducing atmosphere, alkaline dust, etc.; another example is the patented technology of "Lightweight Forsterite Brick and Its Manufacturing Method" (200610134805), which combines olivine sand, magnesia, coke and Mix charcoal, etc., dry, burn, cut, and grind to obtain light-weight forsterite bricks with a service temperature of 1540°C

[0004] In short, there are some deficiencies in the preparation methods of forsterite materials or forsterite bricks in the prior art: or the raw materials contain impurities such as iron and calcium, resulting in unstable high-temperature properties of the product; or the prepared product is lightweight material

Therefore, they cannot meet the requirements of bulk density, porosity and high temperature properties of refractory products in high temperature environments in contact with corrosive media, reducing atmospheres, alkaline dust, etc.