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中南大学学报(自然科学版)

Journal of Central South University

第15卷    第2期    总第40期    1984年6月

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微细粒锡石的两液浮选
黄金才1,李隆峰1,胡为柏2

(1.矿山系
2.矿物工程系
)

摘 要: 本文研究了-5微米锡石的两液浮选,并与相应条件下的常规浮选进行了比较。结果表明,两液浮选工艺优于泡沫浮选,锡石回收率可达99.3%,精矿含90.0%SnO2。研究发现,捕收剂在两液浮选中起着三重作用:(1)使矿粒疏水;(2)使油相乳化;(3)影响油滴表面电性。油液表面的ζ-电位负值比矿粒-溶液间的ζ-电位还大,是两液浮选中的一个重要影响因素。两液浮选比泡沫浮选优越的原因:(1)两液浮选中产生的油/水界面较大,提高了细粒矿物的碰撞几率和附着面积;(2)油相体系的Hamaker常数比气相体系的Hamaker常数大,因而油滴比气泡更有利于疏水矿粒的粘附。

 

关键字: 浮选过程; 锡石; 捕收剂; 泡沫浮选; 微细粒; 回收率; 水界面; 浮选工艺; 影响因素; 油滴

TWO-LIQUID FLOTATION OF ULTRAFINE CASSITERITE
黄金才1,李隆峰1,胡为柏2

1.矿山系
2.矿物工程系

Abstract:Two-liquid flotation of - 5 μm cassiterite was studied in this paper and a comparison with conventional flotation in similar condition was made. It was shown that two-liquid flotation exceeded froth flotation, and that a 99.3% recovry of cassiterite could be achieved and the tin concentrate contained 90.0% of SnO2. It was discovered that surfactant played three kinds of role in two-liquid flotation: (1) to make mineral particles hydrophobic; (2) to make the oil phase emulsive: (3) to influence the electrokinetics of the surface of an oil drop. Zeta potential of the surface of an oil drop was larger than that of the surface of a mineral particle, which was an important affection factor-in two-liquid flotation. The reasons why two-liquid flotation was superior to froth flota- tion were that: (1) oil / water interface produced in two-liquid flotation was larger than gas / water interface produced in froth flotation, thus the collision chance and adhesion areas between fine particles and oil drops were increased; (2) Hamaker constant between an oil drop (iso-octane) and a hydrophobic cassiterite particle was over 1000 times larger than that between a bubble and hydrophobic cassiterite particle, so that an oil drop was more favorable than a bubble for the adhesion of hydrophobic cassite- rite particles.

 

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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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