《Table 2.Specific surface area and pore size distribution of stone coal waste rocks at different lea

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《"Leaching behavior of V,Pb,Cd,Cr,and As from stone coal waste rock with different particle sizes"》

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Specific surface area is one of the key factors in characterizing the difficulty with which heavy metals are released from waste rocks.Changes in the pore size reflect the features of waste rocks in different periods.Table 2 presents the specific surface areas and pore size distributions of the original sample，the upper samples after 30 and 100 d of leaching，and the bottom sample after 100 d of leaching.The single-point Brunauer–Emmett–Teller（BET）specific surface area，average pore size，and the total pore volume of the upper waste rocks increased for all particle sizes over time because of the chemical erosion by the acid solution.In addition，the 0–0.15 mm stone coal waste rocks indicators showed more substantial changes:the specific surface area and average pore size increased from the initial values of3.37 m2/g and 55.62 nm to 3.63 m2/g and 72.41 nm，respectively.This result is attributed to the large surface area of fine particles and the increased soluble mineral and heavy metals that reacted with the solution.For the bottom waste rocks of different particle sizes，the specific surface area，average pore size，and total pore volume were lower than those of the upper waste rocks of correspondent particle sizes.That may be because the heavy metals released from the upper waste rocks precipitated.