铬铁矿氧化焙烧—水浸提铬残渣中仍然存在较大量未反应的铬元素，研究其深度提取对于实现铬铁矿资源的全资源化利用具有重要意义。利用NaOH-NaCl体系对铬铁矿无钙焙烧渣深度提铬，探究了氧化焙烧过程工艺参数对铬提取率的影响及焙烧过程动力学。结果表明，NaCl用量、焙烧时间、焙烧温度等参数都会影响到铬的提取率。在氢氧化钠添加量为40%（质量分数）、氯化钠添加量为10%（质量分数）、铬渣粒径为100目、焙烧温度为900 ℃、焙烧时间为150 min的优化条件下，铬的提取率达到98%。低熔点NaOH的加入促进了传质，NaCl分解产生的Cl₂作为催化剂和氧化剂，为从铬渣中高效回收铬提供了新思路。铬渣在NaOH-NaCl氧化焙烧体系中由内扩散控制，频率因子为0.026 min^-1，反应表观活化能约为25.00 kJ/mol。并对经焙烧提铬后的铬渣进行了表征分析，结果表明焙烧过程中铬渣的结构遭到破坏，铬从尖晶石结构中释放出来，从而实现铬的提取。

A large amount of unreacted chromium still exists in the chromite oxidation roasting-water leaching chromium extraction residue，and the study of its in-depth extraction is of great significance for realizing the full resource utilization of chromite resources.In this study，the NaOH-NaCl system was proposed for the deep extraction of chromium from the calcium-free roasting residue of chromite，and the effects of process parameters on the extraction rate of chromium in the oxidative roasting process and the kinetics of the roasting process were investigated.The results showed that parameters such as NaCl dosage，roasting time and roasting temperature affected the extraction rate of chromium.Under the optimized conditions of sodium hydroxide of 40%， sodium chloride of 10%，chromium slag size of 100 mesh，roasting temperature of 900 ℃ and roasting time of 150 min，the chromium extraction rate reached 98%.The addition of NaOH with a low melting point promoted mass transfer，and Cl₂ generated from the decomposition of NaCl acted as a catalyst and oxidizer，providing a new idea for the efficient recovery of chromium from chromium slag.The oxidative roasting system of chromium slag in NaOH-NaCl was controlled by internal diffusion with the frequency factor A=0.026 min^-1，and the apparent activation energy of the reaction E was about 25.00 kJ/mol.The chromium slag after chromium extraction by roasting was also characterized，and the results showed that the structure of chromium slag was destroyed during roasting，and chromium was released in the spinel structure to achieve chromium extraction.