Modified calcium alumino-titanate refractory raw material and preparation method thereof

Abstract

The invention relates to a modified calcium alumino-titanate refractory raw material and a preparation method thereof. The technical scheme of the modified calcium alumino-titanate refractory raw material is characterized in that firstly, calcium titanium aluminate melting blocks are subjected to heat insulation for 3 to 4 hours under the condition of 1,400 to 1,450 DEG C; cooling is performed along with the furnace; crushing is performed; grinding is performed until the granularity is smaller than or equal to 0.058mm, so as to obtain calcium titanium aluminate micro powder; then, the titaniumcalcium aluminate micro powder, the silicon micro powder and the vanadium pentoxide micro powder are mixed according to the mass ratio of 1 to (0.15 to 0.20) to (0.01 to 0.03); ball milling is performed for 2 to 3 hours to obtain mixed materials; then, the mixed materials are subjected to machine pressing shaping under the condition of 160 to 180 MPa; the heat insulation is performed for 2 to 4 hours under the condition of 1,450 to 1,500 DEG C; after the cooling along with the furnace, crushing is performed, and the modified calcium alumino-titanate refractory raw material is prepared. The modified calcium alumino-titanate refractory raw material has the characteristics that the resources are comprehensively used; the energy is saved; the environment is protected; the prepared modified calcium alumino-titanate refractory raw material has small heat conduction coefficient, good chemical stability and easy sintering performance.

Description

technical field [0001] The invention belongs to the technical field of calcium aluminate titanate. In particular, it relates to a modified calcium aluminate titanate refractory raw material and a preparation method thereof. Background technique [0002] Calcium aluminate titanate is widely used in ladle lining, tundish permanent layer, cement rotary kiln transition zone and vanadium reverberatory furnace lining due to its low thermal conductivity, high wear resistance and high refractoriness. However, the current reports mainly apply calcium aluminate titanate directly to other composite materials, often ignoring the adverse effects of the phase changes of calcium aluminate titanate in different material systems on the performance of composite materials. Such as "a calcium aluminate titanate-high alumina modified refractory material and its preparation method" (CN104609872A) and "a calcium aluminate titanate preform for lining a reverberatory furnace for vanadium smelting a...

AI Technical Summary

Problems solved by technology

However, the current reports mainly apply calcium aluminate titanate directly to other composite materials, often ignoring the adverse effects of the phase changes of calcium aluminate titanate in different material systems on the performance of composite materials

For example, "A Calcium Aluminate Titanate-High Alumina Modified Refractory Material and Its Preparation Method" (CN104609872A) and "A Calcium Aluminate Titanate Prefabricated Part for the Lining of Vanadium Smelting Reverberatory Furnace and Its Preparation Method" (CN105036774A) patents The technology is to use calcium aluminate titanate directly in combination with other raw materials, without considering the CA in calcium aluminate titanate 2 to CA 6 Effect of transformation and oxidation of trace metals titanium and iron on sintering behavior of materials

In addition, the patented technology of "regenerated high-alumina refractories with ferrotitanium slag as the main raw material and its preparation method" (CN103922772A) although the calcium aluminate titanate has been ground, calcined and acid leached, the calcining temperature is relatively low, and the Good for CA 2 to CA 6 and the acid leaching cannot eliminate the rutile phase in calcium aluminate titanate, resulting in too high impurity content in the generated high-alumina refractory raw materials, which limits the scope of application