| 主权项 |
1. A method for protecting a surface of an optical sorting apparatus that is subject to wear, the apparatus being configured to sort a material based on characteristics including color, the wear being associated with the material contacting the surface, the method comprising covering the surface with a colored wear tile so as to substantially prevent the material from contacting the surface, wherein:
the material is sorted into two or more groups, one of the two or more groups comprising desired product having a color; the colored wear tile has a color that permeates substantially an entire mass of the colored wear tile, the color of the colored wear tile being different from the color of the desired product; the colored wear tile, or portions or pieces thereof, that may mix with the material is separated from the desired product by the apparatus on the basis of a difference between the color of the colored wear tile and the color of the desired product, and the colored wear tile is produced by firing a composition at or above about 2500° F. from about 45 minutes to about 90 minutes, the composition being selected from the group consisting of, i. Composition A comprising prior to firing,
a. Al2O3 from about 75 wt. % to about 98 wt. %,b. MnO2 from about 0.25 wt. % to about 3.5 wt. %,c. TiO2 from about 0.1 wt. % to about 2.5 wt. %,d. Fe3O4 from about 0.1 wt. % to about 2.5 wt. %,e. clay from about 0 wt. % to about 10 wt. %,f. Al2SiO5 from about 0.01 wt. % to about 8.0 wt. %,g. talc from about 0 wt. % to about 2.5 wt. %,h. dispersant from about 0 wt. % to about 2.0 wt. %,i. defoamer from about 0 wt. % to about 1.0 wt. %,j. binder from about 0.1 wt. % to about 10 wt. %, andk. calcium stearate from about 0 wt. % to about 4.5 wt. %; ii. Composition B comprising prior to firing,
a. Al2O3 from about 75 wt. % to about 98 wt. %,b. CaF2 from about 0.1 wt. % to about 4.0 wt. %,c. Cr2O3 from about 0.05 wt. % to about 3.0 wt. %,d. clay from about 0 wt. % to about 4.5 wt. %,e. talc from about 0 wt. % to about 4.0 wt. %,f. tannic acid from about 0 wt. % to about 3.5 wt. %,g. dispersant from about 0 wt. % to about 3.0 wt. %,h. defoamer from about 0 wt. % to about 2.0 wt. %,i. binder from about 0 wt. % to about 10.0 wt. %, andj. calcium stearate from about 0 wt. % to about 4.5 wt. %; iii. Composition C comprising prior to firing,
a. Al2O3 from about 75 wt. % to about 98 wt. %,b. Al2SiO5 from about 0.01 wt. % to about 8.0 wt. %,c. Cr2O3 from about 0.05 wt. % to about 3.0 wt. %,d. clay from about 0 wt. % to about 10.0 wt. %,e. talc from about 0 wt. % to about 4.0 wt. %,f. Stonelite (CaMg(CO3)2—Fe2O3) or dolomite (CaMg(CO3)2) from about 0 wt. % to about 3.5 wt. %,g. dispersant from about 0 wt. % to about 3.0 wt. %,h. defoamer from about 0 wt. % to about 2.0 wt. %,i. binder from about 0 wt. % to about 10.0 wt. %, andj. calcium stearate from about 0 wt. % to about 4.5 wt. %; iv. Composition D comprising prior to firing,
a. Al2O3 from about 75 wt. % to about 98 wt. %,b. TiO2 from about 0.5 wt. % to about 5.0 wt. %,c. CoO from about 0 wt. % to about 3.0 wt. %,d. Fe3O4 from about 0 wt. % to about 3.0 wt. %,e. NiO2 from about 0 wt. % to about 3.0 wt. %,f. Kaolin clay (Al2Si2O5(OH)4) from about 1.0 wt. % to about 8.0 wt. %,g. dispersant from about 0 wt. % to about 3.0 wt. %,h. defoamer from about 0 wt. % to about 2.0 wt. %,i. binder from about 0 wt. % to about 5.0 wt. %, andj. calcium stearate from about 0 wt. % to about 3.5 wt. %; and v. Composition E comprising prior to firing,
a. Al2O3 from about 75 wt. % to about 98 wt. %,b. Al2SiO5 from about 0.5 wt. % to about 8.0 wt. %,c. clay from about 0 wt. % to about 10.0 wt. %,d. talc from about 0 wt. % to about 4.0 wt. %,e. Stonelite (CaMg(CO3)2—Fe2O3) or dolomite (CaMg(CO3)2) from about 0 wt. % to about 3.5 wt. %,f. CoO from about 0 wt. % to about 3.0 wt. %,g. dispersant from about 0 wt. % to about 3.0 wt. %,h. defoamer from about 0 wt. % to about 2.0 wt. %,i. binder from about 0 wt. % to about 5.0 wt. %, andj. calcium stearate from about 0 wt. % to about 3.5 wt. %. |
