At present, low-grade nickel sulfide ore with high-alkaline gangue has replaced high-grade nickel sulfide ore as the main raw material for the extraction of nickel. Traditional pyrometallurgical smelting processes have problems such as high energy consumption, large loss of valuable metals, and low comprehensive resource utilization. In this paper, an improved process that uses chlorination roasting followed by water leaching to treat low-grade nickel matte, an intermediate product derived from flotation and high-temperature smelting of ore, is innovatively put forward. The results present that 93.6% Ni, 91.7% Cu and 88.2% Co can be synchronously extracted using matte particles of size range 75–80 μm, chlorination time of 2 h, mass ratio of chlorinating agent to matte at 2:1 and chlorination temperature of 350 °C. The chlorination roasting process was determined using differential thermal and thermogravimetric analysis (DTA-TG), X-ray diffraction (XRD), thermodynamic analysis of chlorination reactions. The kinetics of chlorination process based on the thermal analysis data are analyzed by Kissinger method and Flynn-Wall-Ozawa (FWO) method, and the results show that the average apparent activation energy (E_a) of the matte chlorination process is 77.8 kJ/mol.

目前，具有高碱性脉石的低品位硫化镍矿已经取代了高品位硫化镍矿成为提取镍的主要原料。传统的火法冶炼工艺存在能耗高，有价金属损失大，综合资源利用率低等问题。本文提出了一种改进的方法，该方法提出了一种改进的方法，该方法采用氯化焙烧然后水浸处理来处理低品位的镍哑粉，后者是浮选和矿石高温冶炼的中间产物。结果表明，使用尺寸范围为75–80μm，氯化时间为2 h，氯化剂与雾化剂的质量比为2：1和氯化温度的同步雾化颗粒，可以同步提取93.6％的Ni，91.7％的Cu和88.2％的Co。 350°C。使用差示热和热重分析（DTA-TG），X射线衍射（XRD）和氯化反应的热力学分析来确定氯化焙烧过程。根据基辛格方法和Flynn-Wall-Ozawa（FWO）方法对基于热分析数据的氯化过程动力学进行了分析，结果表明平均表观活化能（亚光氯化过程的E _a）为77.8 kJ / mol。