EAF渣矿相组成及其短期淋溶特性
发布时间：2019-04-12 08:13
【摘要】：采用XRD方法研究了EAF渣矿相组成,采用静态淋溶实验方法,研究了液固比、淋溶液初始p H值和淋溶温度对EAF渣短期淋溶特性的影响。结果表明,EAF渣中存在的主要矿物为镁硅钙石、硅酸二钙、钙铝黄长石、磁铁矿、尖晶石、绿铬矿和钙钛矿。短期淋溶条件下,EAF渣淋溶液呈现强碱性和一定的还原性,EAF渣淋溶液中铬质量浓度随着液固比的升高而有所降低,强酸或强碱性淋溶液会在一定程度上提高淋溶液中铬质量浓度,温度对淋溶液中铬质量浓度影响较小;淋溶液铬质量浓度不仅受铬富集相溶解反应平衡控制,也受到淋溶液酸性影响,酸性较强时利于渣中碱性氧化物Cr(OH)3的分解,碱性较强时利于Cr(OH)4-离子的生成;EAF渣淋溶液中的铬主要以三价态存在,六价铬和总铬质量浓度均低于《危险废物鉴别标准浸出毒性鉴别》(GB 5085.3—2007)限值,在一定程度上说明EAF渣的短期淋溶毒性风险较低。
[Abstract]:The phase composition of EAF slag was studied by XRD method. The effects of liquid-solid ratio, initial pH value of leaching solution and leaching temperature on the short-term leaching characteristics of EAF slag were studied by static leaching test. The results show that the main minerals in EAF slag are magnesite, dicalcium silicate, perovskite, magnetite, spinel, chlorite and perovskite. Under the condition of short-term leaching, the leaching solution of EAF slag showed strong alkalinity and certain reducibility, and the concentration of chromium in the leaching solution of EAF slag decreased with the increase of liquid-solid ratio. Strong acid or strong alkaline leaching solution can increase the concentration of chromium in the leaching solution to a certain extent, and the temperature has little effect on the concentration of chromium in the leaching solution. The concentration of chromium in leaching solution is controlled not only by the equilibrium of chromium concentration phase dissolution, but also by the acidity of leaching solution. When the leaching solution is strong, it is beneficial to the decomposition of basic oxide Cr (OH)-3 in the slag and the formation of Cr (OH)-4-ion when the leaching solution is strong. Chromium in the leaching solution of EAF slag mainly exists in trivalent state, and the mass concentration of hexavalent chromium and total chromium is lower than the limit value of GB 5085.3 / 2007, which is lower than the limit value of Hazardous waste Identification Standard leaching toxicity Identification (GB 5085.3 / 2007). To some extent, the risk of short-term leaching toxicity of EAF slag is lower.
【作者单位】： 华北理工大学冶金与能源学院;
【基金】：国家自然科学基金(51274085,51574108)
【分类号】：X757
本文编号：2456861
[Abstract]:The phase composition of EAF slag was studied by XRD method. The effects of liquid-solid ratio, initial pH value of leaching solution and leaching temperature on the short-term leaching characteristics of EAF slag were studied by static leaching test. The results show that the main minerals in EAF slag are magnesite, dicalcium silicate, perovskite, magnetite, spinel, chlorite and perovskite. Under the condition of short-term leaching, the leaching solution of EAF slag showed strong alkalinity and certain reducibility, and the concentration of chromium in the leaching solution of EAF slag decreased with the increase of liquid-solid ratio. Strong acid or strong alkaline leaching solution can increase the concentration of chromium in the leaching solution to a certain extent, and the temperature has little effect on the concentration of chromium in the leaching solution. The concentration of chromium in leaching solution is controlled not only by the equilibrium of chromium concentration phase dissolution, but also by the acidity of leaching solution. When the leaching solution is strong, it is beneficial to the decomposition of basic oxide Cr (OH)-3 in the slag and the formation of Cr (OH)-4-ion when the leaching solution is strong. Chromium in the leaching solution of EAF slag mainly exists in trivalent state, and the mass concentration of hexavalent chromium and total chromium is lower than the limit value of GB 5085.3 / 2007, which is lower than the limit value of Hazardous waste Identification Standard leaching toxicity Identification (GB 5085.3 / 2007). To some extent, the risk of short-term leaching toxicity of EAF slag is lower.
【作者单位】： 华北理工大学冶金与能源学院;
【基金】：国家自然科学基金(51274085,51574108)
【分类号】：X757
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