摘要:
研究钛石膏的各种性能特点,对钛石膏的回收、资源化利用以及与其它矿物质复掺利用有着重要意义。以最大化利用钛石膏为目的,用脱硫石膏替换部分钛石膏进行试验,对不同时间下的钛石膏试块进行含水率与强度测试。试验结果表明:在自然养护条件下,随着养护时间的增加,钛石膏试块的抗折强度、抗压强度均呈现先降低后增高的趋势,含水率先快速降低后趋于缓慢降低。利用Origin软件对试验数据进行拟合分析,采用Cubic(x,A,B,C,D)模型可以较好预测钛石膏试块抗折强度与抗压强度变化,LangmuirEXT2函数模型可以较好预测钛石膏试块含水率变化。结合SEM分析钛石膏试块强度降低又增长的主要原因是随着钛石膏试块在自然养护条件下自由水快速地失去,二水石膏晶体周围自由水含量降低,大部分水由物理吸附转变为化学吸附,构成了二水石膏晶体,形成了有效的结构强度。
关键词:
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钛石膏 /
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含水率 /
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强度 /
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强度转变点 /
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数据拟合
Abstract:
Studying various performance characteristics of titanium gypsum is of great significance for the recovery,resource utilization and re-use of titanium gypsum.In order to maximize the use of titanium gypsum,experiments were performed by replacing part of titanium gypsum with flue gas desulfurization gypsum（FGD）,and moisture content and strength tests were performed on titanium gypsum test blocks at different time points.The experimental results show that under natural curing conditions,with increase of the curing time both of the flexural strength and compressive strength of the titanium gypsum test blocks first decrease and then increase,and the moisture content decreases rapidly and then slowly.Using the Origin software to fit and analyze the experimental data,the Cubic（x,A,B,C,D） model can be used to predict the change in flexural strength and compressive strength of the titanium gypsum test block,and the LangmuirEXT2 function model can better predict the changes in moisture content of gypsum test blocks.The main reason for the decrease followed by increase in strength of titanium gypsum test blocks combined with SEM analysis is that the rapid loss of free water under natural curing conditions with the free water content around the dihydrate gypsum crystals decreased,and most of the water changes from physical adsorption to chemical adsorption which constitutes dihydrate gypsum crystals and forms effective structural strength.
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