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Class Information
Number: 423/157.4
Name: Chemistry of inorganic compounds > Treating mixture to obtain metal containing compound > Alkaline earth metal (mg, ca, sr, or ba) > Phosphate rock or ore > Acid treatment > Sulfating
Description: Processes in which the treatment includes the step of chemically forming a compound containing the sulfate, (SO4
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7172742 |
Method of preparing wet process phosphoric acid |
Feb. 6, 2007 |
| 7101522 |
Production of dicalcium phosphate or monocalcium phosphate |
Sep. 5, 2006 |
| 6562308 |
Process for the recovery of phosphate from phosphate rock |
May. 13, 2003 |
| 6544489 |
Defoaming compositions for high acid strength media |
Apr. 8, 2003 |
| 6365117 |
Method for preparing phosphoric acid |
Apr. 2, 2002 |
| 6235257 |
Process waters in phosphate manufacturing |
May. 22, 2001 |
| 6231767 |
Treatment of phosphatic wastes |
May. 15, 2001 |
| 6183712 |
Production of dicalcium phosphate or monocalcium phosphate from calcium phosphate |
Feb. 6, 2001 |
| 5679315 |
Method of production of high purity silica |
Oct. 21, 1997 |
| 5395603 |
Automatic control system for a chemical process, especially a wet process phosphoric acid plant |
Mar. 7, 1995 |
| 5362460 |
Magnesium separation from dolomitic phosphate by sulfuric acid leaching |
Nov. 8, 1994 |
| 5236679 |
Removal of aluminum contamination during production of phosphoric acid |
Aug. 17, 1993 |
| 5211735 |
Process for preparing phosphated or nitrophosphated fertilizers through solubilization of phosphate rock |
May. 18, 1993 |
| 5124137 |
Process for the preparation of alkali metal phosphate solutions |
Jun. 23, 1992 |
| 5108721 |
Treatment of high nickel slimes |
Apr. 28, 1992 |
| 5009873 |
Crystal modification in wet process phosphoric acid production |
Apr. 23, 1991 |
| 4828811 |
Method for producing phosphoric acid from phosphate ore |
May. 9, 1989 |
| 4777027 |
Continuous process for preparing phosphoric acid and calcium sulphate |
Oct. 11, 1988 |
| 4743438 |
Process for producing phosphoric acid from low purity phosphate rock |
May. 10, 1988 |
| 4710364 |
Continuous recovery of sulfur oxide from flue gas |
Dec. 1, 1987 |
| 4704263 |
Production of potassium phosphates by ion exchange |
Nov. 3, 1987 |
| 4702896 |
Thermal treatment of phosphate rock |
Oct. 27, 1987 |
| 4524054 |
Process for the production of dicalcium phosphate |
Jun. 18, 1985 |
| 4501724 |
Method for the wet process manufacture of phosphoric acid |
Feb. 26, 1985 |
| 4495161 |
Energy recovery method and system for combined sulphuric acid and phosphoric acid manufacturing plant |
Jan. 22, 1985 |
| 4485077 |
Method for conducting wet grinding of phosphate rock in a phosphoric acid production plant |
Nov. 27, 1984 |
| 4457781 |
Method for solidifying waste slime suspensions |
Jul. 3, 1984 |
| 4452770 |
Phosphoanhydrite process |
Jun. 5, 1984 |
| 4424196 |
Phosphohemihydrate process for purification of gypsum |
Jan. 3, 1984 |
| 4405575 |
Method of defluorinating phosphates |
Sep. 20, 1983 |
| 4402923 |
Process for making phosphoric acid |
Sep. 6, 1983 |
| 4399110 |
Process for reducing the radioactivity of calcium sulfate prepared from phosphate rock |
Aug. 16, 1983 |
| 4362705 |
Process for the preparation of phosphoric acid and calcium sulphate anhydrite as well as phosphoric acid and calcium sulphate anhydrite obtained by this process |
Dec. 7, 1982 |
| 4350671 |
Method of preparing phosphoric acid by a wet process |
Sep. 21, 1982 |
| 4330364 |
Process of strengthening dilute phosphoric acid |
May. 18, 1982 |
| 4328193 |
Process for removing radium from monocalcium phosphate solutions by centrifugation |
May. 4, 1982 |
| 4313915 |
Method for the manufacture of phosphoric acid by the wet process |
Feb. 2, 1982 |
| 4309395 |
Phosphoric acid production |
Jan. 5, 1982 |
| 4298583 |
Process for manufacturing phosphoric acid |
Nov. 3, 1981 |
| 4284614 |
Process for production of high purity phosphoric acid from high alumina phosphate pebble rock |
Aug. 18, 1981 |
| 4282192 |
Process for producing a calcium sulfate product containing low amounts of radium |
Aug. 4, 1981 |
| 4277448 |
Phosphoric acid process with high circulation rates |
Jul. 7, 1981 |
| 4276270 |
Start-up procedure in producing phosphoric acid by the hemihydrate process |
Jun. 30, 1981 |
| 4260584 |
Apparatus useful for wet process phosphoric acid production |
Apr. 7, 1981 |
| 4221769 |
Process for preventing the formation of calcium sulphate scale |
Sep. 9, 1980 |
| 4220630 |
Hemihydrate type process for phosphoric acid manufacture using additive to improve filterability |
Sep. 2, 1980 |
| 4196172 |
Hemihydrate type phosphoric acid process |
Apr. 1, 1980 |
| 4188366 |
Manufacture of phosphoric acid |
Feb. 12, 1980 |
| 4181703 |
Method for the treatment of phosphate rock |
Jan. 1, 1980 |
| 4177243 |
Process for production of phosphate rock slurries having reduced water content and viscosity |
Dec. 4, 1979 |
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