Abstract: A process for producing potassium sulfate from potash and sodium sulfate, which involves providing a source of sodium sulfate and passing the sodium sulfate through cationic exchanger. Eluted potassium sulfate containing sodium sulfate is reacted with potash to form further potassium sulfate.

Abstract: A process for producing potassium sulfate from potash and sodium sulfate, which involves providing a source of sodium sulfate and passing the sodium sulfate through cationic exchanger. Eluted potassium sulfate containing sodium sulfate is reacted with potash to form further potassium sulfate.

Abstract: Industrial materials can be efficiently pan granulated by grinding the material to 95% minus 150 mesh, feeding this to a pan in conjunction with 1 to 15% seed materials and applying binder solution such that the free moisture content of the green ball is between 8-13% by weight of the feedstock. The granules build up on the seed to a desired size range, say -5 to +8 mesh, in an onion skin manner. Product is sent preferably to a fluid bed dryer for drying. The productivity and classification is very high with yields up to 95% for two mesh size ranges, such as -5 to +8 mesh.

Abstract: A process is disclosed for producing high brightness kaolin from ore containing silica, other types of clays, minerals such as ilmenite micas, feldspars and various metal silicates as well as organic matter. The process consists of sizing, a double floatation step, magnetic separation, leaching and oxidative brightening steps. This is a novel combination of conventional unit operations and in particular the use of a double floatation step to remove quartz and various trace minerals that interfere with achieving high optical brightness for kaolin.