|Monthly Tech-Tip |
We ran the tests, assigning our code number of L4567 to the project. Of course, putting some in water was the first obvious test. As expected, it swelled in a manner similar to bentonite. Then we sieved 100g through a 50 sieve mesh removing almost exactly 50% aggregate, which looks similar to grog. We fired the aggregate to 2200F (upper left) and it is refractory, with few particles melting. Is it brick grog? No, we poured some water on the fired aggregate and it hydrated the same way limestone does (upper right). The 50% finer material was slurried and allowed to settle. It did not do so, even after a week (bottom), showing it is clearly colloidal, likely sodium bentonite. The bentonite portion fired dark brown and melting, the same behaviour as typical raw bentonite. So what is this cat litter? Dry raw bentonite grains sized to ~30 mesh mixed 50:50 with limestone aggregate of the same size.