Modified amine-aldehyde resins and uses thereof in separation processes
View Patent ↗Modified resins are disclosed for removing a wide variety of solids and/or ionic species from the liquids in which they are suspended and/or dissolved. These modified resins are especially useful as froth flotation depressants in the beneficiation of many types of materials (e.g., mineral and metal ores), including the beneficiation of impure coal comprising clay impurities, as well as in the separation of valuable bitumen from solid contaminants such as sand. The modified resins are also useful for treating aqueous liquid suspensions to facilitate the removal of solid particulates, as well as the removal of metallic ions in the purification of water. The modified resins comprise a base resin that is modified with a coupling agent, which is highly selective for binding to solid contaminants and especially siliceous materials such as sand or clay.
1. A modified urea-formaldehyde resin for use in solid/liquid separation processes comprising, a urea-formaldehye resin modified with a silane coupling agent, wherein the urea-formaldehyde resin has a mole ratio of urea:formaldehyde in the range of 1:2 to 1:3.
2. The modified base resin of claim 1 , wherein said base resin comprises a urea-formaldehyde resin having a number average molecular weight (M n ) of greater than about 100 grams/mole.
3. The modified base resin of claim 2 , wherein said base resin has a number average molecular weight (M n ) from about 400 to about 4000 grams/mole.
4. The modified base resin of claim 1 , wherein said modified base resin is in the form of a solution or dispersion having a resin solids content from about 0.1% to about 90% by weight.
5. The modified base resin of claim 1 , having a resin solids content of greater that about 90% by weight.
6. The modified base resin of claim 5 , wherein said modified base resin is in the form of solid powder, prill, lump, flake or melt.