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中南大学学报(自然科学版)

Journal of Central South University

第41卷    第6期    总第196期    2010年12月

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文章编号:1672-7207(2010)06-2096-07
氯化铵-氯化焙烧红土镍矿工艺及其热力学计算
符芳铭1,胡启阳1,李新海1,王志兴1,李金辉1, 2,李灵均1

(1. 中南大学 冶金科学与工程学院,湖南 长沙,410083;
2. 江西理工大学 材料与化学工程学院,江西 赣州,341000
)

摘 要: 通过对使用氯化铵焙烧法处理云南元江地区红土镍矿的相关化学反应进行热力学计算,并在此基础上研究氯化铵与红土镍矿质量比、焙烧温度、焙烧时间等工艺条件对红土镍矿氯化焙烧效果的影响。研究结果表明:随着焙烧温度的提高,镍、钴、锰的铁酸盐的氯化程度降低;而镍、钴、锰的硅酸盐和蛇纹石的氯化程度受焙烧温度的影响很小;镍、钴、锰、铁的氧化物除二氧化锰外,氯化程度均随焙烧温度提高而降低;当焙烧温度为673 K、焙烧时间为15 min、氯化铵与矿料质量比为0.8׃1.0时,镍、钴、锰、铁、镁在常温下用水浸出5 min的浸出率分别为80%,60%,99%,58%和19%。

 

关键字: 红土镍矿;氯化焙烧;热力学;浸出

Thermodynamics and chloridizing roasting conditions of
 laterite through ammonium chloride
FU Fang-ming1, HU Qi-yang1, LI Xin-hai1, WANG Zhi-xing1, LI Jin-hui1, 2, LI Ling-jun1

1. School of Metallurgical Science and Engineering, Central South University, Changsha 410083, China;
2. School of Materials and Chemical Engineering, Jiangxi University of Science and Technology,
Ganzhou 341000, China

Abstract:On the basis of thermodynamics with NH4Cl as chloridizing agent, the chloridizing roasting conditions of laterite obtained from Yunan Province including the mass ratio of NH4Cl/ore, roasting temperature and roasting time were researched. The results show that the chloride degree of ferrite of nickel, cobalt and manganese descends gradually with the increase of roasting temperature, the chloride degree of silicate of nickel, cobalt and manganese and serpentine are not influenced nearly by roasting temperature, and the chloride degree of oxide of nickel, cobalt, manganese and iron decreases with the increase of temperature besides manganese dioxide. The optimal conditions are as follows: roasting temperature is 673 K, roasting time is 15 min, the mass ratio of NH4Cl to ore is 0.8׃1.0, the dissolution yields of nickel, cobalt, manganese, iron and magnesium using water as leaching reagent in 5 min at room temperature are 80%, 60%, 99%, 58% and 19%, respectively.

 

Key words: laterite; chloridizing roasting; thermodynamics; leaching

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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