钙镁离子对细粒赤铁矿絮凝行为的影响

Effects of Calcium and Magnesium Ions on Flocculation Behavior of Fine Hematite

为了了解Ca^(2+)、Mg^(2+)对细粒赤铁矿絮凝行为的影响,以巴西某细粒赤铁矿石为研究对象,分别考察了用Na_2CO_3和Na OH调节矿浆pH的情况下,Ca^(2+)、Mg^(2+)对细粒赤铁矿絮凝行为的影响。结果表明:矿浆中Ca^(2+)、Mg^(2+)均能促进细粒赤铁矿的絮凝,随着Ca^(2+)、Mg^(2+)浓度的增大,促进效果增强。pH调整剂为Na_2CO_3时,随着矿浆pH升高,未达硬水浓度的Ca^(2+)对细粒赤铁矿絮凝行为的促进效果均增强,而Mg^(2+)对细粒赤铁矿絮凝行为的促进作用先增强后减弱;pH调整剂为Na OH时,随着矿浆pH升高,Ca^(2+)、Mg^(2+)对细粒赤铁矿絮凝行为的促进作用逐渐增强。矿浆中添加Ca^(2+)与添加Mg^(2+)相比,同等水硬度下,Ca^(2+)对细粒赤铁矿絮凝行为的促进作用优于Mg^(2+)。相同试验条件下,使用Na OH作pH调整剂时的细粒赤铁矿絮凝效果强于使用Na_2CO_3作pH调整剂时。

In order to understand the effect of Caz＋ and Mg〉 on the floeeulation behavior of fine hematite, with a grained hematite ore in Brazil as the object ,the effects of Ca〉 and Mg2＋ on flocculation of grained hematite were investigated by adjus- ting the pH value of the pulp by Na2CO3 and NaOH. The results showed that Ca2＋ and Mg〉 contenting in the pulp promoted the floeculation of fine hematite. With the increase of Ca〉 and Mg~＋ concentration, the effect is enhanced. When the pH regulator is Na2CO3 ,the promoting effect of Ca〉 below the concentration of hard water on the floceulation behavior of fine hematite is en- hanced with the increase of pulp pH, and the promoting effect of Mg〉 on the floeeulation behavior of fine hematite is enhanced and then weakened. When the pH regulator is NaOH, the effect of Ca2＋ and Mg2＋ on the flocculation behavior of fine hematite was gradually enhanced with the increase of pH value. The effect of Caz＋ on the floeculation behavior of fine hematite is better than that of Mg2＋ under the same hardness of water. Under the same experimental conditions, the flocculation effect of fine hem- atite with NaOH as a regulator is stronger than that with Na2 CO3 as a regulator.