摘要
本文选取贵州典型磷矿区海相沉积型磷矿石为研究对象,通过ξ电位测定和纯矿物浮选试验,考察了Ca2+、Mg2+对胶磷矿表面电性及可浮性的影响。结果表明:加入Ca2+、Mg2+后,胶磷矿表面负电性降低,由此可推知,胶磷矿是优先吸附溶液中的Ca2+、Mg2+而使表面负电性降低。Mg2+在胶磷矿表面的吸附使其表面形成类似白云石的覆盖层,从而会降低分选的选择性。在酸性条件下,Ca2+、Mg2+对胶磷矿浮选影响不大,但在中性及碱性条件下,金属离子的加入会明显地抑制胶磷矿的上浮,其原因可能是金属离子与脂肪酸类捕收剂发生沉淀反应,从而消耗捕收剂,并且在碱性条件下形成氢氧化物沉淀,并吸附罩盖在矿物表面,使矿物表面亲水,不易上浮。
Tests on zeta potential and flotation of pure minerals in collophanite were conducted to study the influence of Ca2＋ and Mg2＋ on collophanite surface electrical properties and flotability.The electro negative decreases because Ca2＋and Mg2＋are adsorbed preferentially on collophanite.Collophanite surface became similar to dolomite because of Mg2＋adsorption,thus,the separation selectivity decreases.Influence of Ca2＋and Mg2＋on collophanite flotability is low in acid condition.However,collophanite is obviously depressed by Ca2＋ and Mg2＋ under alkaline condition,because that Ca2＋ and Mg2＋ might consume collector to precipitate.Otherwise,collophanite become hydrophilic because that calcium hydroxide and magnesium hydroxide absorption occurs on the surface.
出处
《矿物学报》
CAS
CSCD
北大核心
2013年第2期185-188,共4页
Acta Mineralogica Sinica
基金
贵阳市科技局大学生创业计划(No.筑科合同[2011201]大-4-7号)
国家自然科学基金(批准号:51164005)
贵州省重大专项(No.黔科合重大专项字[2011]6023)
