| 摘要 |
The invention provides a processes of producing man-made vitreous fibres having a phosphorus content of at least 0.5%, measured as weight % p<SUB>2</SUB>o<SUB>5</SUB>, comprising providing a charge of mineral material which includes briquettes, melting the charge in a furnace to provide a melt and fiberising the melt to form fibres, wherein the briquettes. comprise a non-virgin rock material comprising at least 2% phosphorus, the non-virgin rock material being selected from the group consisting of sewage sludge ash, bone meal ash, granulated sewage sludge slag and mixtures thereof. |
