一氧化碳脱毒铬渣制备水泥矿物掺合料

doi:10.11962/1006-4990.2020-0366

Abstract

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

CLC Number:

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.

Figures/Tables 15

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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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Preparation of cement mineral admixture from chromium slag detoxified by carbon monoxide

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