【摘要】：細粒鐵精礦在濃縮過濾環(huán)節(jié)存在沉降速率慢,溢流固體懸浮物濃度高,精礦濾餅含水率高等問題。通過添加絮凝劑產(chǎn)生凝聚、橋連等作用使礦物顆粒形成絮團,可以促進細粒鐵精礦沉降。以某赤鐵礦精礦為研究對象,陰離子型、陽離子型、非離子型和兩性聚丙烯酰胺為絮凝劑,通過沉降試驗及赤鐵礦表面ζ電位測定來考察聚丙烯酰胺對赤鐵礦絮凝沉降行為的影響。結(jié)果表明:赤鐵礦顆粒與絮凝藥劑分子間相互作用方式主要包括靜電力、氫鍵、范德華力、化學吸附等,而ζ電位在這一過程中是否起主要作用以及對這一過程是起促進或者弱化作用主要取決于絮凝劑使用種類、用量和礦漿pH值。試驗結(jié)果為選擇合適絮凝劑更好促進細粒鐵精礦沉降提供了理論依據(jù)和指導。
[Abstract]:Fine iron concentrate has a slow settling rate in the concentrated filtration link, high concentration of spillway solid suspended substance and high water content of the concentrate filter cake. By adding flocculant to produce flocculation, bridge connection and other effects make mineral particles form floc, which can promote the settlement of fine iron concentrate, with a certain hematite concentrate as the research object, anionic type and cationic type. Non ionic and amphoteric polyacrylamide are flocculants. The effect of polyacrylamide on flocculation and settlement behavior of hematite is investigated by settlement test and zeta potential measurement on hematite surface. The results show that the intermolecular interaction between hematite particles and flocculating agents mainly includes electrostatic force, hydrogen bond, Fan Dehua force, chemical adsorption and so on, and Zeta electricity. The main function of the position in this process and the effect of promoting or weakening the process depend mainly on the type of flocculant, the amount and the pH value of the pulp. The experimental results provide the theoretical basis and guidance for the selection of the suitable flocculant to better promote the settlement of fine iron concentrate.
【作者單位】： 武漢科技大學資源與環(huán)境工程學院;冶金礦產(chǎn)資源高效利用與造塊湖北省重點實驗室;
【基金】：國家自然科學基金項目(編號:50974099)
【分類號】：TD951

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1 J.源;R.J.普魯厄特;黎小玲;;佐治亞州高嶺土的ζ電位及有關性質(zhì)[J];國外選礦快報;1998年23期

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