摘要:
研究了粉煤灰在水中的溶解行为,结果表明:(1)灰水混合液在不同转速下搅拌20min后,pH值、电导率、碱度、Ca2+浓度等指标不再明显变化;(2)向混合液中加入Na2CO3可有效降低Ca2+的浓度,而且Na2CO3的投加量与Ca2+浓度之比(摩尔比)为0.8: 1时,混合液中Ca2+即可降至15mg·l-1以下;(3)向灰水分离后的清液中通入CO2(6min)可将全部碱性物质转化为HCO3-,并溶入大量CO2,用此水冲灰可达到与投加Na2CO3相似的效果.
关键词:
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冲灰水
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结垢
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碳酸钠
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二氧化碳
Abstract:
The dissolution behavior of coal ash was studied,and in order to reduce concentration of Ca2+ in composite solution of ash and water,Na2CO3 was added.CO2 was aerated in the solution after ash was separated,and new ash was dissolved again.It was found that: 1) pH,conductance,alkalinity and Ca2+ achieved stability after composite solution was stirred for 20min;2) Concentration of Ca2+ in composite solution was reduced by addition of Na2CO3,and when the mol ratio of Na2CO3 and Ca2+ was 0.8:1,concentration of Ca2+ was reduced to less than 15 mg·l-1;3) All alkalinity was converted to HCO3-,and CO2 was dissolved in the solution in which ash was separated after CO2 was aerated for 6min.The effect of CO2 on ash dissolution resembled of Na2CO3.
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