The report gives results of a study to identify significant sources of emissions of potentially hazardous trace pollutants from mining and processing of non-metallic minerals. Based on a review of domestic ore processing data and consideration of both the toxicity of potential pollutants and the significance of fugitive dust emissions, the following nine industries were selected for further study: cement, clay (including porcelain, refractory, and brick), gypsum, lime, phosphate rock (including fertilizer), potash, boron, mica, and fluorspar. Provided for each of the nine industries are process flow diagrams identifying major processes and material flow, identification of sources of emissions of various pollutants, and process descriptions. The report recommends that five processes be further evaluated because of their potential for emissions of hazardous pollutants or fugitive dust: kilns (cement and lime industries), phosphate rock mining and washing, clay mining, hydrator (thermal phosphoric acid production), and reactor (wet-process phosphoric acid production).
"EPA-650/2-74-122." EPA contract no. 68-02-1321, Task 4, ROAP no. 21AUZ-02a, program element no. 1AB015. EPA project officer: D.K. Oestreich. References follow individual chapters.