利用磷酸镁水泥固化富集型重金属铜和镍研究
收稿日期: 2019-09-28
网络出版日期: 2020-03-31
Study on solidification mechanism of MPC for enrichment heavy metals Cu and Ni
Received date: 2019-09-28
Online published: 2020-03-31
利用磷酸镁水泥对富集型重金属铜和镍进行固化研究。对掺入硝酸铜和硝酸镍水泥的抗压强度、铜镍离子浸出质量浓度、水化产物组成等进行测定,观测水泥表面的微观形貌,分析铜镍离子在水泥中的化学态及赋存状态。研究表明:硝酸铜掺量为0~3%(质量分数)时,水泥的抗压强度随着铜离子掺量的增加呈现先增大后减小的趋势,当硝酸铜掺量为1%时,水泥7 d抗压强度达到最大值46.05 MPa;硝酸镍掺量为0~3%(质量分数)时,水泥的抗压强度随着镍离子掺量的增加而逐渐减小,当硝酸镍掺量由0增加到3%时,水泥7 d的抗压强度降低了约29%。水泥的密实度与铜镍离子的固化效果直接相关。在硝酸铜和硝酸镍掺量都为3%时,水泥1 d铜离子浸出质量浓度最高为1.95 mg/L、镍离子浸出质量浓度最高为0.97 mg/L,均远低于相关国家标准。铜主要以+2价态的Mg0.95Cu0.05O形式存在,镍主要以+2价态的Ni(OH)2无定形沉淀形式存在。
贾鹏里 . 利用磷酸镁水泥固化富集型重金属铜和镍研究[J]. 无机盐工业, 2020 , 52(3) : 94 -97 . DOI: 10.11962/1006-4990.2019-0246
MPC(magnesium phosphate cement) was used to solidificate enrichment heavy metal Cu and Ni. The compressive strength of MPC added Cu(NO3)2 and Ni(NO3)2,the leaching concentration of Cu 2+ and Ni 2+,and the composition of hydration products were determined.The surface microstructure was observed.The chemical states and occurrence of Cu 2+ and Ni 2+ in cement were analyzed.Results showed that when content of Cu 2+ increased from 0 to 3%(mass fraction),the compressive strength of cement increased first and then decreased with the increase of Cu 2+ content;the 7 d compressive strength reached the maximum value of 46.05 MPa,when the dosage of Cu 2+ was 1%.When the content of Ni 2+ increased from 0 to 3%(mass fraction),the the compressive strength of cement decreased gradually with the content of Ni 2+ increased,and the 7d compressive strength decreased about 29%.The compactness of cement was directly related to the curing effect of Cu 2+ and Ni 2+.When the dosage of Cu 2+and Ni 2+ was both 3%,the maximum leaching concentration of Cu 2+ was 1.95 mg/L,and Ni 2+ was 0.97 mg/L,both far below the relevant national standards. Cu mainly exists in the form of Mg0.95Cu0.05O of +2,and Ni exists in the form of Ni(OH)2 amorphous precipitation of +2.
Key words: heavy metal; MPC; mechanical property; solidification
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