锂云母渣作为掺合料的可行性研究.pdf

w. kue tu.coa
2015年第8期(总第310期
混
凝
土
原材料及辅助物料
Number 8 in 2015(Total No 310)
Concrete
MATERIAL AND ADMINCLE
doi:10.3969/.isn.1002-350.2015.08.022
锂云母渣作为合料的可行性研究
许开成,黄财林,陈梦
(华东交通大学土木建筑学院建筑过程模拟与控制江西省重点实验室,江西南昌33013)
摘要:针对宜春地区的锂长石矿粉、通过“锂云母固氟重构综合提取碳酸锂技术”提取碳酸锂之后产生的灰色锂云母渣和通过
变温碳化法”制备碳酸锂产生的白色锂云母渣进行研究。此3种粉末均作为掺合料以掺量10%、20%、30%和40%掺入水泥胶砂
试件,且同条件下浇筑和养护掺有粉煤灰和硅灰的水泥胶砂试件作为对比组。标准养护至规定龄期后进行抗折和抗压试验;试
验结果表明:锂长石矿粉的掺入极大的降低了胶砂试件的抗折强度和抗压强度;白色锂云母渣作为掺合料具有明显的优势,摻量
在20%以内时,掺白色锂云母渣胶砂试件早期强度优于掺有其他掺合料的试件,后期强度亦与掺粉煤灰试件相当,且优于掺其他
掺合料的试件。掺灰色锂云母渣试件虽早期强度具有优越性,但后期强度却不具优勢。
关键词;锂云母渣;粉煤灰;硅灰;掺合料;胶砂试件
中图分类号:TU528.041
文献标志码:A
文章编号:1002-3550(2015)08-0084-03
Feasibllity research of lepidolite slag as mineral admixture
XU Kaicheng HUANG Cailin, CHEN Mengcheng
(Key Laboratory of onstruction Process Simulation and Control, School of Civil Engineering and Architecture
East China Jiao-tong University, Nanchang 330013, China)
Abstract: The aim of his exeriment is o alidation e feasibility of i ium-feldspar powder, gray lepidolite slags and white lepido
lite slags from Yichun as the mineral admixtures. The gray Lepidolite slags is the by-product of"The technology of comprehensive ex
traction of it hium carbonate from lepidolite after reconstuction and flune -fixin ment,and the white lepidolite slags is the
by -product of "carbon zation in variable temperature Preparing 3 groups of cement mortar samples for the three kinds of mineral ad-
mixtures, each groups contain 4 samples with the dosages of 10, 20, 30% 40%eectively. Besides, under the same condition
pouring and maintaining the other cement mortar samples which contains the fly ash and silica fume as the control groups. The test
eces is kept still o the determinate time by adn a anar curing method, and then to test the flexural and compressive strength
Research results show that the infiltration of he lithim -felspar powder reduce the flexural and compressive strength of the cement
mortar sample greatly Compared with lithium -feldspar powder, the white lepidolite slags as the mineral admixtures has obvious advan
tages in that when the dosages is within 20%, the result is that the samples contain the white lepidolite slags is better than any other sam-
ples at early strength, though at late stage its strength is just the same as the sample which contain the fly ash, and its still better than
other samples. The gray lepidolite slags ones have remarkable superiority in the early strength, but do not in the late strength
Key words: lepidolite slag; fly ash; silica fume; mineral admixture; mortar specimens
0引言
渣不仅会污染环境,而且占用耕地。如何有效的利用这些
废渣,使之“变废为宝”对工程经济和环境保护等方面具有
面对能源紧张和日益严峻的环保形势,世界各国对风重要的意义。国内的矿石钾资源主要有分布在四川新疆
能、太阳能等可再生无污染的清洁能源的开发利用显得越的锂辉石以及江西宜春的锂云母的,已有许多专家学者针
来越迫切,而这些新能源的开发利用都离不开锂。可谓对锺辉石矿渣进行了试验研究,例如张兰芳“就掺锂辉
“有锂走遍天下,无锂寸步难行”。键是自然界最轻的金石渣混凝土的强度、抗碳化性能以及抗氯离子渗透性能进
属,被誉为“工业味精”、“能源之星”。
行了试验研究,温勇?等就锂渣粉掺量对混凝土的力学性
作为“亚洲锂都”,据勘探表明,宜春可利用氧化锂的能、吸水性能和抗氯离子滲透性能的影响进行了试验研
储量约250万t,占全国的二分之一;其中,宜春钽铌矿可究。但是针对宜春锂云母渣作为掺合料的研究却是空白。
开采氧化锂的储量为110万t,占全国的31%,世界的12%,本试验通过把宜春锂云母渣作为掺合料掺人到水泥胶砂
居矿石锂矿的世界首位。随着对宜春锂矿开采的加速,一试件中进行研究,分析了掺合料种类不同对水泥胶砂试件
个首要问题就是在开采和冶炼过程中产生的废渣。这些废强度的影响,验证了锂云母渣作为掺合料的可行性,并且
收稿日期:2014-11-20
基金项目:国家自然科学基金(51468017);江西省优势科技创新团队项目(2013BCB24008)