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Author: Admin | 2025-04-28
Used as construction aggregate, 74.9 million tons used for cement manufacture, and 18.1 million tons used to make lime. Crushed marble sold or used totaled 11.8 million tons, the majority of which was ground very fine and used as calcium carbonate.In 2006, 9.40 million tons of crushed stone (almost all limestone or dolomite) was used for soil treatment, primarily to reduce soil acidity. Soils tend to become acidic from heavy use of nitrogen-containing fertilizers, unless a soil conditioner is used. Using aglime or agricultural lime, a finely-ground limestone or dolomite, to change the soil from acidic to nearly neutral particularly benefits crops by maximizing availability of plant nutrients, and also by reducing aluminum or manganese toxicity, promoting soil microbe activity, and improving the soil structure.In 2006, 5.29 million tons of crushed stone (mostly limestone or dolomite) was used as a flux in blast furnaces and in certain steel furnaces to react with gangue minerals (i.e. silica and silicate impurities) to produce liquid slag that floats and can be poured off from the much denser molten metal (i.e., iron). The slag cools to become a stone-like material that is commonly crushed and recycled as construction aggregate.In addition, 4.53 million tons of crushed stone was used for fillers and extenders (including asphalt fillers or extenders), 2.71 million tons for sulfur oxide removal-mine dusting-acid water treatment, and 1.45 million tons sold or used for poultry grit or mineral food.Crushed stone is recycled primarily as construction aggregate or concrete.Terminology and variations[edit]The term "high performance bedding" (HPB) is used to refer to 1/4" and 3/8" crushed rock.Granular A, Granular B, and Granular C, all represent crushed rock mixed with sand in which Granular A has the least amount of sand, and Granular B has the most amount of sand. "Granular A" is also referred to
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