Ultrafine nepheline syenite

Abstract

A useable particulate nepheline syenite having a grain size to provide an Einlehner Abrasive Value of less than about 100 is described. The particulate nepheline syenite is generally free from agglomeration and moisture free. At least 99% of the nepheline syenite particles have a size less than 10 microns. In practice, the nepheline syenite grain size is less than about 5 microns and the distribution profile of the particulate system is generally 4-5 microns.

1 . A moisture-free composition comprising particulate nepheline syenite wherein at least 99% of the particles of nepheline syenite have a size less than about 10 microns. 
   
   
       2 . The composition of  claim 1  wherein at least 99% of the particles of nepheline syenite have a size less than about 5 microns. 
   
   
       3 . The composition of  claim 1  wherein at least 99% of the particles of nepheline syenite have a size of from about 4 to about 5 microns. 
   
   
       4 . The composition of  claim 1  wherein the particulate nepheline syenite produces an Einlehner abrasive value less than 100. 
   
   
       5 . The composition of  claim 4  wherein the Einlehner abrasive value is less than about 50. 
   
   
       6 . The composition of  claim 1  wherein more than 99% of the particles of nepheline syenite have a size of about 5 microns. 
   
   
       7 . The composition of  claim 1  wherein the particles of nepheline syenite have a size of from 5 microns to about 1 micron. 
   
   
       8 . The composition of  claim 1  wherein the particles of nepheline syenite have a size of less than about 4 microns. 
   
   
       9 . The composition of  claim 1  wherein the particles of nepheline syenite have a distribution profile of sizes from less than 10 microns to at least 1 micron. 
   
   
       10 . The composition of  claim 9  wherein the distribution profile of sizes is from about 4 to about 5 microns. 
   
   
       11 . The composition of  claim 1  wherein the particles of nepheline syenite have a maximum size of 10 microns and the particles produce an Einlehner abrasive value of less than 100. 
   
   
       12 . The composition of  claim 11  wherein the particles produce an Einlehner abrasive value of about 50. 
   
   
       13 . The composition of  claim 11  wherein the particles of nepheline syenite have a size of less than 5 microns. 
   
   
       14 . The composition of  claim 1  wherein the particles of nepheline syenite have a maximum size of 5 microns and the particles produce an Einlehner abrasive value of less than about 50. 
   
   
       15 . The composition of  claim 1  wherein the particles of nepheline syenite have a size in the range of 0.5 to 5 microns. 
   
   
       16 . The composition of  claim 1  wherein the particles are essentially free from agglomeration. 
   
   
       17 . A moisture-free composition comprising particulate nepheline syenite wherein at least 99% of the particles of nepheline syenite have a size of from 1 to 10 microns and the particles produce an Einlehner abrasive value of less than 100. 
   
   
       18 . The composition of  claim 17  wherein the particles produce an Einlehner abrasive value of about 50. 
   
   
       19 . The composition of  claim 17  wherein the Einlehner abrasive value is less than 50. 
   
   
       20 . The composition of  claim 17  wherein the particles of nepheline syenite have a size of from about 5 microns to about 1 micron. 
   
   
       21 . The composition of  claim 17  wherein at least 99% of the particles of nepheline syenite have a size of from about 4 to about 5 microns. 
   
   
       22 . The composition of  claim 17  wherein more than 99% of the particles of nepheline syenite have a size of about 5 microns. 
   
   
       23 . The composition of  claim 17  wherein the particles of nepheline syenite have a size of less than about 4 microns. 
   
   
       24 . The composition of  claim 17  wherein the particles of nepheline syenite have a distribution profile of sizes from less than 10 microns to at least 1 micron. 
   
   
       25 . The composition of  claim 24  wherein the distribution profile of sizes is from about 4 to about 5 microns. 
   
   
       26 . The composition of  claim 17  wherein the particles are essentially free from agglomeration. 
   
   
       27 . Moisture-free particulate nepheline syenite comprising particles of nepheline syenite having a size of less than 10 microns, wherein the particulate nepheline syenite produces an Einlehner abrasive value of less than 100. 
   
   
       28 . The particles of  claim 27  wherein the particles of nepheline syenite have a size less than 5 microns. 
   
   
       29 . The particles of  claim 27  wherein the particles of nepheline syenite have a size of from about 4 to about 5 microns. 
   
   
       30 . The particles of  claim 27  wherein the particulate nepheline syenite produces an Einlehner abrasive value less than 50. 
   
   
       31 . The particles of  claim 27  wherein more than 99% of the particles of nepheline syenite have a size of about 5 microns. 
   
   
       32 . The particles of  claim 27  wherein the particles of nepheline syenite have a size of from 5 microns to about 1 micron. 
   
   
       33 . The particles of  claim 27  wherein the particles of nepheline syenite have a size of less than about 4 microns. 
   
   
       34 . The particles of  claim 27  wherein the particles of nepheline syenite have a distribution profile of sizes from less than 10 microns to at least 1 micron. 
   
   
       35 . The particles of  claim 34  wherein the distribution profile of sizes is from about 4 to about 5 microns. 
   
   
       36 . The particles of  claim 27  wherein the particles produce an Einlehner abrasive value of about 50. 
   
   
       37 . The particles of  claim 36  wherein the particles of nepheline syenite have a size of less than 5 microns. 
   
   
       38 . The particles of  claim 27  wherein the particles of nepheline syenite have a size in the range of 0.5 to 5 microns.