초록 ▼

The present invention is directed to a colloidal aqueous silicate dispersion containing silica and alumina, the molar ratio between silica and alumina being 2-12, as well as to a method for its preparation. Said method is characterized by dissolving a particulate mineral material, such as a mineral

The present invention is directed to a colloidal aqueous silicate dispersion containing silica and alumina, the molar ratio between silica and alumina being 2-12, as well as to a method for its preparation. Said method is characterized by dissolving a particulate mineral material, such as a mineral wool or fiber product containing silica and alumina in a molar ratio of 2-12 in an aqueous solution, nucleating and stabilizing the so obtained solution, and optionally adjusting the dry matter content of the dispersion so obtained. The said dispersion can also be made to gel. The invention is also directed to the use of the dispersion as a binder.

대표청구항 ▼

1. A colloidal silicate dispersion comprising:silica; alumina; one or more alkali oxides; water, wherein the molar ratio between silica and alumina is 2 to 12, and the molar ratio between silica and the sum of alkali oxides is in the range of 10-350. 2. The dispersion according to claim 1, further c

1. A colloidal silicate dispersion comprising:silica; alumina; one or more alkali oxides; water, wherein the molar ratio between silica and alumina is 2 to 12, and the molar ratio between silica and the sum of alkali oxides is in the range of 10-350. 2. The dispersion according to claim 1, further comprising one or more members selected from the group consisting of:calcium oxide, magnesium oxide and iron oxide, where the molar ratio between silica and the sum of calcium oxide, magnesium oxide arid iron oxide is in the range of 0.5 to 2. 3. The dispersion according to claim 2, said molar ratio between silica and the sum of calcium oxide, magnesium oxide and iron oxide is in the range of 0.6 to 1.5.4. The dispersion according to claim 1, wherein said colloidal silicate dispersion has a particle size of from 10 to 100 nm.5. A gel comprising a gelled dispersion of said colloidal silicate dispersion of claim 1.6. The colloidal silicate dispersion according to claim 1, comprising calculated as % by weight,SiO235-45Al2O310-25R2O0.2-3,?wherein R means Na or K.7. The colloidal silicate dispersion according to claim 6, comprising, calculated as % by weight.CaO12-35MgO?6-20FeO?2-10.8. The colloidal silicate dispersion according to claim 1, comprising, calculated as % by weight,SiO235-45Al2O3?8-13R2O0.2-1,?wherein R means Na or K.9. The colloidal silicate dispersion according to claim 8, comprising, calculated as % by weight.CaO30-40MgO?5-11FeO (total iron)0.1-1.?10. The colloidal silicate dispersion according to any one of claim 1 or 2 wherein said dispersion is alkaline.