碳酸锶生产中锶盐废渣的危险特性分析

Analysis of hazardous characteristics of strontium salt residue in the production of strontium carbonate

采集西南某碳酸锶生产企业不同年份下碳酸锶生产过程中产生的锶盐废渣(下称"锶渣"),分析其重金属浓度、浸出浓度及遇酸反应生成的H_2S浓度,研究锶渣的危险特性。结果表明:锶渣中Sr浓度最高,最大值为175 000 mg/kg,均值为112 000 mg/kg;其次是Ba浓度,最大值和均值分别为6 020和3 420 mg/kg;其他重金属如As、Cr、Cu、Ni、Pb、Be和Cd浓度均低于100 mg/kg;锶渣中Sr的浸出浓度最高,其最大值和均值分别为360和180 mg/L,Ba、Pb和As的浸出浓度均较低;锶渣中的硫化物遇酸反应生成H_2S,其浓度均值为0.23 mg/kg,最大值为0.45 mg/kg;锶渣中重金属的浸出浓度和遇酸生成H_2S的浓度总体上随着堆存时间延长而降低。

The strontium salt slag produced from the strontium carbonate production process in one strontium carbonate enterprise in different years was acquired. The contents and leaching concentrations of heavy metals and the amount of H2 S after reacting with the acid in strontium slag were analyzed, and the risk characteristic of the strontium slag researched. The results showed that the Sr content of strontium slag was the highest, with the maximum value of 175 000 mg/kg and the average of 112 000 mg/kg. The maximum and average contents of Ba were 6 020 and 3 420 mg/kg, respectively. The contents of other heavy metals such as As, Cr, Cu, Ni, Pb, Be and Cd were below 100 mg/kg. The Sr concentration in strontium slag was the highest with the maximum and the average values of 360 and 180 mg/L, respectively. The leaching concentrations of Ba, Pb and As were all lower.The average concentration of H2 S of strontium slag in acid reaction was 0. 23 mg/kg and the maximum value was 0. 45 mg/kg. The leaching of heavy metals in strontium slag and the concentration of H2 S in acid reaction decreased with the increase of storage time.