(1. 中國礦業(yè)大學(xué) 化學(xué)與環(huán)境工程學(xué)院，北京 100083；
2. 北京礦冶研究總院，北京 100044)
摘 要: 針對傳統(tǒng)石灰法處理礦山酸性廢水存在結(jié)垢嚴(yán)重和處理效果不穩(wěn)定等問題，研究了高濃度泥漿法(HDS)替代工藝。結(jié)果表明，高濃度泥漿法(HDS)處理礦山酸性廢水的主要機(jī)理如下：酸堿中和、金屬離子沉淀及共沉淀作用；污泥回流使沉淀底泥晶體化、粗顆粒化，加快了污泥沉降和分離的速度；沉淀底泥Zeta電位提高，易于與帶負(fù)電位的硫酸鈣接近并附著，晶核不斷長大，可顯著延緩設(shè)備和管路的結(jié)垢。該技術(shù)處理礦山酸性廢水效果好，出水水質(zhì)穩(wěn)定達(dá)到GB 8978-1996《污水綜合排放標(biāo)準(zhǔn)》中二級排放標(biāo)準(zhǔn)的要求。
關(guān)鍵字: 高濃度泥漿法；礦山酸性廢水；廢水處理；機(jī)理
（1. School of Chemical and Environment Engineering, China University of Mining & Technology,
Beijing 100083, China;
2. Beijing General Research Institute of Mining & Metallurgy, Beijing 100044, China）
Abstract:In order to solve the problems of serious scaling and unstable treatment by common lime neutralization, high density sludge (HDS) method was investigated to treat the mine acidic waste water. The results show that the mechanism of mine acidic waste water treatment by high density sludge (HDS) can be elucidated as the following aspects: acid-alkali neutralizing, metal ions sediment and co-precipitation; sludge circulation results in the crystallization of settled sludge to accelerate settling velocity; higher Zeta potential value of settled sludge makes favorable adsorption of Ca(SO4)2 with negative potential to increase the crystal nucleus and retard the equipments and pipelines scaling. HDS method is efficient for the treatment of mine acidic wastewater and the effluent can stably meet two grades of integrated wastewater discharge standard (GB 8978-1996).
Key words: high density sludge; mine acidic waste water; waste water treatment; mechanism
