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铬元素的赋存状态对不锈钢渣中铬的稳定性有重要的影响,而尖晶石相被认为是最佳的铬稳定相。为有效稳定不锈钢渣中的铬元素,降低铬的溶出性,减少污染的风险,研究了不同碱度条件下铬的迁移及富集行为。试验过程中所用的合成渣在1 600℃条件下充分熔化后,然后分别在1 600℃和1 300℃下保温30min后进行水冷,并采用SEM-EDS及XRD观察不同碱度下不锈钢渣的物相组成和铬的赋存形式。结果表明:碱度能显著影响铬的迁移及富集行为,试验中碱度为1.5时,有利于不锈钢渣中的铬富集于尖晶石相,在1 300℃条件下,铬的富集度接近100%。碱度为1.0时,铬主要溶解于液相中,1 300℃条件下冷却只有少量的含铬尖晶石相生成。当碱度为2.0时,有含铬的方镁石相析出。同时低温条件下淬冷有利于不锈钢渣中的铬向尖晶石相富集。
The occurrence of chromium has an important effect on the stability of chromium in stainless steel slag, while the spinel phase is considered as the best chromium stable phase. In order to effectively stabilize the chromium in stainless steel slag, reduce the dissolution of chromium and reduce the risk of pollution, the migration and enrichment of chromium under different alkalinity were studied. The synthetic slag used in the experiment was fully melted at 1 600 ° C, and then cooled at 1 600 ° C and 1 300 ° C for 30 minutes, respectively, and then water-cooled. SEM-EDS and XRD were used to observe the contents of stainless steel slag Phase composition and the occurrence of chromium forms. The results show that alkalinity can significantly affect the migration and enrichment behavior of chromium. When the alkalinity is 1.5, the chromium content in the stainless steel slag is enriched in the spinel phase and the enrichment of chromium at 1300 ℃ Degree close to 100%. Alkalinity is 1.0, chromium is mainly dissolved in the liquid phase, and only a small amount of chromium-containing spinel phase is formed at 1300 ℃. When the alkalinity is 2.0, chromium-containing periclase phase is precipitated. At the same time quenching at low temperature conducive to stainless steel slag chromium enrichment to the spinel phase.