Inventors:
- Reno NV, US
David Scott Keselica - Lakeland FL, US
Kimberly Walsh - Sandy UT, US
Peter E. Lenz - Reno NV, US
Chongjun Jiang - Reno NV, US
Bradley Scott Humphreys - Sparks NV, US
International Classification:
B01J 20/14
B01J 20/04
C12H 1/07
B01J 20/30
C12H 1/044
B01J 20/08
B01J 20/283
Abstract:
Low soluble arsenic diatomite filter aids and method of making such filter aids are disclosed. Alumina and/or aluminum hydroxide (ATH) are used as additives when preparing the filter aids, which may be straight-calcined or flux-calcined. Alternatively, activated alumina may be added to an already straight-calcined or flux-calcined diatomite filter aid. As compared to either straight-calcined or soda ash flux-calcined diatomite filter aids of similar permeabilities made from the same ore, the disclosed filter aids have lower soluble arsenic content. The disclosed filter aids have a soluble arsenic content, either by the OIV, EBC or USFCC method, of about 60% or less than the straight or flux-calcined diatomite filter aids of similar permeability without an alumina or ATH additive.