Mineral processing wastes

The material properties of the various categories of mineral processing wastes are influenced by the characteristics of the parent rock, the mining and processing methods used, and the methods of handling and/or disposing of the mineral by-product [99-112]. The physical and chemical properties of waste rock, mill tailings, and coarse coal refuse are summarized and discussed in Table 12. 

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Mineral processing spent materials. Mineral processing generates spent materials that may exhibit hazardous waste characteristics. Common industry practice is to recycle these mineral processing wastes back into the processing operations to recover mineral value. U.S. EPA created a conditional exclusion from the definition of solid waste for these spent materials when recycled in the mineral processing industry, provided the materials are stored in certain types of units and are not accumulated speculatively. 

Mining and mineral processing wastes. Certain wastes from the mining, refining, and processing of ores and minerals are excluded from the definition of hazardous waste. 

Soda ash (sodium carbonate), mineral processing Waste gases, ammonia makeup Ammonia Brine solution Production of ammonium hydroxide for ammonium bicarbonate production Stripping not practiced... 

In liquid-solid separation where acrylamide polymers act as flocculants and aids in mineral processing, waste treatment and water treatment. They also help reduce sludge volumes in these applications. 

Peterson, J. B. May, A. Characterization of Mining/Mineral Processing Waste Using Ox-idation/Reduction Potential and pH Measurements, Proc. Western Reg. Symp. Mining Min. Process. Wast. (Soc. for Mining, Metallurgy Exploration) 1990, 53-59. Berkeley, CA, USA, May 30-Jun 1 1990. 

Brown K. P. and Hosseinipour E. Z. (1991) New methods for modelling the transport of metals from mineral processing wastes into surface waters. J. Environ. Sci. Health A 26, 157-203. 

F. M. Doyle and A. H. Mirza, Understanding the Mechanisms and Kinetics of Acid and Heavy Metals Release from Pyritic Wastes, in Mining and Mineral Processing Wastes, F. M. Doyle (ed.), SME, Littleton, CO, 1990, pp. 43-51. 

Mineral processing wastes MPW Amounts since early production are 50 billion t (55 billion T) 21 Sulfate wastes SW 900 million t (1 billion T)... 

Table 12 Physical and chemical properties of mineral processing wastes... 

Granular base Blast furnace slag Coal boiler slag Mineral processing wastes Municipal solid waste combustor ash Nonferrous slags Reclaimed asphalt pavement Contaminated soils Reclaimed concrete Steel slag Waste glass... 

Embankment or fill Coal fly ash Mineral processing wastes Nonferrons slags Reclaimed asphalt pavement Reclaimed concrete Scrap tires... 

Svabite (Ca5(As04)3p) and other calcium arsenates have been considered for safe arsenic disposal, in treating industry and mineral processing wastes with lime, and it has been assumed that these solids are extremely insoluble and stable [23, 36, 66-68]. Currently this technique has been abandoned as there is evidence that calcium arsenate compounds slowly decompose either by change of pH of the media or by contact with atmospheric carbon dioxide that under alkaline conditions gives rise to the formation of calcium carbonate with slow release of arsenate ions back into the environment [69]. 

Sedimentation Portable water clarification municipal treatment storage pond for toxic waste and mineral processing waste and pretreatment step for feed to filters and centrifuges. 

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