一氧化碳脱毒铬渣制备水泥矿物掺合料

doi:10.11962/1006-4990.2020-0366

摘要/Abstract

摘要：

实验研究了模拟一氧化碳工业废气解毒的脱毒铬渣制备水泥矿物掺合料时,其添加比对胶砂试件抗压、抗折强度及凝结时间的影响,测定了试件中总铬（Cr）和六价铬Cr（Ⅵ）浸出浓度,并采用半动态浸出实验测定其有效扩散系数D和扩散因子L。结果表明,细磨后的脱毒铬渣符合水泥矿物掺合料的性能要求,随着添加比例的增加,胶砂凝结时间增加,抗压、抗折强度下降,但各实验组试件均达到C60的强度等级要求。试件中Cr（Ⅵ）和总Cr的D值达到10^-10~10^-9数量级,L值>9,迁移能力极低,证明制备矿物掺合料是一种安全有效的脱毒铬渣资源化处置方法。

关键词: 白云石, 缓冲体系, 球霰石, 碳酸钙, 脱毒铬渣, 矿物掺合料, 一氧化碳, 水泥

Abstract:

The influence of the addition ratio of chromium slag detoxified by carbon monoxide off-gas on the compressive strength,bending strength and setting time of concrete test samples were experimentally studied.The leaching concentrations of total chromium（Cr） and hexavalent chromium Cr（Ⅵ）were determined,and their effective diffusion co-efficient D and diffu-sion factor L were calculated by semi-dynamic leaching experiment.The results showed that the detoxified chromium slag after fine grinding could meet the requirement of cement mineral admixture.With the increase of adding ratio,the setting time of mortar were extended,the compressive and bending strength were declined,but all the experimental groups meet the strength grade requirements of C60.The D value of Cr（Ⅵ） and total Cr in the sample was 10^-10~10^-9,L value was more than 9,and the migration ability was very low,which proved that the preparation of mineral admixtures was a safe and effective resource disposal method for detoxified chromium slag.

Key words: dolomite, buffer system, vaterite, calcium carbonate, detoxified chromium residue, mineral admixture, carbon monoxide, cement

中图分类号:

何力为,周学进,宁平. 一氧化碳脱毒铬渣制备水泥矿物掺合料[J]. 无机盐工业, 2021, 53(5): 73-77.

He Liwei,Zhou Xuejin,Ning Ping. Preparation of cement mineral admixture from chromium slag detoxified by carbon monoxide[J]. Inorganic Chemicals Industry, 2021, 53(5): 73-77.

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编号	m（水泥）/g	m（铬渣）/g	m（标准砂）/g	说明
0	450	0	1 350	对照
A-1	405	45	1 350	10%
A-2	360	90	1 350	20%
A-3	315	135	1 350	30%
A-4	270	180	1 350	0%

编号	初凝时间	终凝时间	编号	初凝时间	终凝时间
0	217	252	A-3	227	294
A-1	218	275	A-4	230	295
A-2	221	289

编号	Cr（Ⅵ）平均有效扩散系数D/（cm²·s^-1）	Cr（Ⅵ）浸出因子L	编号	总Cr平均有效扩散系数 D/（cm²·s^-1）	总Cr 浸出因子L
A-1	3.57×10^-10	9.63	A-1	1.56×10^-10	10.27
A-2	4.63×10^-10	9.53	A-2	3.58×10^-10	9.61
A-3	7.43×10^-10	9.36	A-3	2.89×10^-10	9.74
A-4	1.48×10^-9	9.11	A-4	2.14×10^-10	9.84

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