Claims
- 1. The method for removing discolorants from a crude clay by a process including a step of separating weakly magnetically susceptible minute contaminant particles including titanium dioxide from an aqueous clay-water slurry containing said particles in minor concentration with substantially non-magnetic minute mineral particles by subjecting said slurry to magnetic separation in a magnetic field; the improvement comprising reducing the titanium dioxide content of the said clay by:
- (a) mechanically working said clay-water slurry by application of means to produce a force selected from the group consisting of shear forces, impact forces, kneading forces and combinations of two or more of said forces, at a viscosity n in centipoises (cps), a solids content s in pounds per gallon (lg./gal.), and for a time t in minutes (min.) such that the factor nst has a value in the range of 0.335.times.10.sup.-3 to 5.33.times.10.sup.-3 (cps.-lb./gal.-min.) to release the contaminant particles including said titanium dioxide to be removed from said slurry;
- (b) dispersing said clay-water slurry to disperse said contaminant particles to facilitate said magnetic separation; and
- (c) thereafter, magnetically separating said clay-water slurry in a manner to reduce the titanium dioxide content of said clay.
Parent Case Info
This is a continuation of application Ser. No. 727,277 filed Sept. 27, 1976, now abandoned which is a continuation of 580,396, filed May 23, 1975 now abandoned, which is continuation of 405,487, filed Aug. 8, 1974, now abandoned.
US Referenced Citations (12)
Foreign Referenced Citations (3)
Number |
Date |
Country |
877731 |
May 1953 |
DEX |
141880 |
Aug 1922 |
GBX |
903846 |
Aug 1962 |
GBX |
Continuations (3)
|
Number |
Date |
Country |
Parent |
727277 |
Sep 1976 |
|
Parent |
580396 |
May 1975 |
|
Parent |
405487 |
Aug 1974 |
|