磷矿石化学浸提脱镁过程研究.pdf

第44卷第7期
化学工程
ol,.44No.7
2016年7月
CHEMICAL ENGNEERING(CHINA
Jul.2016
磷矿石化学浸提脱镁过程研究
田文祥,窦烙,崔鸥',沈浩2,郑之银2,刘羕
(1.合肥工业大学化学与化工学院可控化学与材料化工安徽省重点实验室,安徽合肥23000;
2.安徽六国化工有限公可,安徽铜陵244000
摘要:以礎硫混酸化学浸提选择性脱除磔矿石中镁杂质过程为对象,研究脱镁过程中磷矿石的磷、镁、钙、铁铝、
钾、钠等元素含量及其微观物理结构变化规律,为磷矿石脱镁预处理提供基础数据。设计了正:交实验并得到优化
T艺条件:反应温度40℃:,搅拌速率300/rain,液固比5:1c'/g,pH值2-3,反应时间30min。采用扫描电镜
(SEM)、化学分析、低温N2吸附(BE)等方法对脱镁过程中产物进行了表征与分析。研究表明:脱镁过程中化学反
应导致磷矿石受得松多孔;主要组成脱除率随反应时间变化各异,Mg0脱除率高且含量持续下降,P20、和Ca0含
量基本不变,Fe2O1,Na20和K20脱除率低,Al20脱除率逐步提高;:随着反应时间增长,礫矿石的比表面积与孔容
均增大,而粒径分布无明显变化规律
关键词:矿石;浸提;脱镁;化学反应;脱除率
中图分类号:TQ021.9;064
文献标识码
文章编号:1005-9954(2016)07-065005
DOL:10.3969/j-jssn105-9954.2016.07.I1
Process of magnesium removal from phosphate rock
by chemical extraction
TIAN Wen-xiang DOU Yan CUI Peng, SHEN Hao, ZEIENG Zhi-yin,, LIU Rong
(1. Anhui key Laboratory of Controllable Chemical Reaction Materiad Chemical Engineering, School of
Chemistry and Chemical Engineering, Hefei University of Technology, Hefei 230009, Anhui Province, China
2. Anhui Liuguo Chemical Industry Co, Ltd,, Tongling 244000, Anhui Province, China)
Abstract: Selective removal of magnesium impurity from phosphate rock by chemical extraction using the mixture
phosphoric and sulfuric acid was investigated. In order to provide basic data for magnesium removal from phosphate
rock. the content of main chemical elements in phosphate rock such as phosphorus, magnesium, calcium, iron
aluminum, potassium, sodium, and the changing law of its microstructure were also studied. The orthogonal
experiment was designed and the optimized process conditions were obtained as follows: the reaction temperature 40
the stirring rate 300 r/min, the ratio of liquid to solid 5: I cm/g, reaction time 30 min and the PH value between
2 and 3. Moreover, te intermediate products were characterized by scanning electron microscope, chemical
analysis, low temperature N adsorptions desorption. The results showed that the chernical reaction made phosphate
rock loose and porous. The removal rates of main chemical elements with reaction time were different. The content
of Mgo continued to decline with a high removal rate, the content of P Os and Ca0 almost unchanged, while
Fe 0, Na,0 and K, O showed u low removal rate and the removal rate of Al, O, tended to increase gradually. It
was also found that pore volume and the surface area of phosphate rock increased with
reacton timle. wh].
particle size distribution showed no obvious change
Key words: phosphate rock; Caching; removal of magnesium; chemical reaction; rate of removal
磷矿石是化丁产业中重要的不可再生资源,磷硫混酸选择性脱除磷矿中镁杂质的化学浸提法已
其化学组成复杂,矿物结构丰富,用酸性介质特别是取得较好的研究进展。罗洪波等用硫酸尿分
收稿期:201507-17
基金项目:安微省科技攻关项目(1060105973〉
作者简介:田文祥(1989-),男、硕士研究生,研究方向为分离过程与装备,E-mail: twxhfut@163.coum;崔鹏,教授,博上生导师,通信联系
人,电话:(0551)620901111Eral: culper@ht.edu.cm
万方数据