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The effect of alkalinity of Class F PC fly ash on metal release

机译：F级PC粉煤灰的碱度对金属释放的影响

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Thirty-five samples of Class F fly ash from pulverized coal (PC) combustion boilers were leached with deionized water, acetic acid, and sulfuric acid. The release of metal ions from fly ash was related to the pH of the leachant solution and to the alkalinity of the ash. The maximum soluble concentration of the metallic elements was measured when the pH of the leachate was less than 5. Twenty-three of the samples were strongly alkaline and buffered the leachate until the ash was neutralized. The leachate from the other 13 samples became acidic with the addition of less than 1 L of 0.1 N acid. The alkalinity of the ash and the volume of acid required to neutralize it were a function of the Ca concentration.
机译：用去离子水，乙酸和硫酸浸提了来自粉煤（PC）燃烧锅炉的35个F级粉煤灰样品。粉煤灰中金属离子的释放与沥滤剂溶液的pH和灰分的碱度有关。当渗滤液的pH值小于5时，测量金属元素的最大可溶浓度。23个样品为强碱性，并缓冲渗滤液直至灰分被中和。通过添加少于1 L的0.1 N酸，来自其他13个样品的渗滤液变为酸性。灰分的碱度和中和灰分所需的酸量是Ca浓度的函数。

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