| 主权项 |
1. A process for manufacturing sintered refractory grains containing Cr2O3 from a starting refractory product which is sintered or fused or consists of a mixture of pieces made of a sintered product and of pieces made of a fused product, said starting refractory product comprising one or more chromium oxide(s), all dimensions of the starting refractory product being greater than or equal to 1 mm, said process comprising the following steps, in this order:
A) optionally, crushing the starting refractory product, B) milling a charge to be milled comprising the crushed starting refractory product obtained from step A) or the starting refractory product that has not been crushed, in a liquid medium in order to obtain a suspension of particles of said starting refractory product, more than 80% of said particles, as a mass percentage, having a size of less than 50 μm, C) preparing a starting mixture comprising at least 1% by mass of particles of the suspension obtained in the preceding step, D) forming the starting mixture in the form of a green part, E) optionally, drying the green part obtained in step D), F) sintering the green part to obtain a sintered body, G) optionally, milling the sintered body, and H) optionally, granulometric selection, steps D), G) and H) being adapted such that the sintered body, optionally milled in step G) and/or selected in step H), has the form of a particle with a size of greater than 50 μm and less than 20 mm or of a powder comprising such particles. |
