Corundum-calcium hexaluminate based on aluminum chromium slag and preparation method thereof

Abstract

The invention relates to corundum-calcium hexaluminate based on aluminum chromium slag and a preparation method thereof. The corundum-calcium hexaluminate is characterized in that aluminum chromium slag and carbon powder are put into a ball mill according to the mass ratio of 100:(0.7 to 1.2); the ball milling is performed to reach the granularity being smaller than or equal to 100 mu m to obtainball milling powder materials; the ball milling powder materials and limestone are mixed for 0.5 to 1 hours according to the mass ratio of 100:(8 to 13) to obtain mixed powder; the mixed powder is added into a vacuum electric arc furnace; the temperature is raised to 1950 to 2050 DEG C; heat insulation is performed for 1 to 2 hours; then, the temperature is lowered to 1800 to 1850 DEG C; heat insulation is performed for 3 to 5 hours; the cooling is performed along with the furnace; the corundum-calcium hexaluminate based on aluminum chromium slag is obtained; the corundum-calcium hexaluminatebased on aluminum chromium slag is a greyish-white product at the upper part of the vacuum electric arc furnace. The corundum-calcium hexaluminate has the characteristics that the process is simple; the production cost is low; the high-quality raw material resources are saved; the environment pollution is reduced; the prepared products have high purity and uniform material phase distribution.

Description

technical field [0001] The invention belongs to the technical field of corundum-calcium hexaaluminate. Specifically relates to a corundum-calcium hexaaluminate based on aluminum chromium slag and a preparation method thereof. Background technique [0002] Aluminum chromium slag is a by-product derived from the smelting of metal chromium, ferrochrome and other alloys by thermite reduction reaction. Utilize metal aluminum and Cr in chrome ore when smelting metal chromium 2 o 3 A reduction reaction occurs to produce metal chromium, metal aluminum powder and Cr 2 o 3 A violent chemical reaction occurs in the molten state, and the generated Al 2 o 3 Rapidly transforms to corundum phase, and at the same time reacts with unreacted Cr 2 o 3 solid solution to generate aluminum-chromium solid solution, that is, aluminum-chromium slag. Aluminum chromium slag contains about 0.08-0.11mg / g Cr 6+ (Chinese chromium-containing waste residue Cr 6+ The control standard is 0.008mg / g)...

AI Technical Summary

Problems solved by technology

The process requires high temperature control, and the prepared calcium hexaaluminate raw material contains relatively high impurities such as calcium monoaluminate (CA) and calcium dialuminate (CA2), and the existence of these impurity phases will affect the quality of the product. Hydration resistance and high temperature performance

In addition, since the above methods all use high-purity raw materials, the production cost is relatively high

[0005] "A method of using calcium slag to prepare calcium hexaaluminate ceramic powder" (CN101456575) patented technology and "a calcium hexaaluminate prepared from anodic oxidation waste slag from an aluminum profile factory and its preparation method" (CN102602970B) patented technology, Both use industrial solid waste as raw material, although the manufacturing cost of calcium hexaaluminate is reduced, but due to the high impurity composition of the raw material used, which cannot be effectively removed, the prepared calcium hexaaluminate is accompanied by some low-melting phases, reduced product quality