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1. 发明授权

US06319482B1 Treatment of fly ASH/APC residues including lead salt recovery 失效
标题翻译：治疗飞行ASH / APC残留物，包括铅盐回收
公开(公告)号：US06319482B1
公开(公告)日：2001-11-20
申请号：US09180956
申请日：1998-11-18
申请人： Steven E. Sawell , Stephen A. Hetherington
发明人： Steven E. Sawell , Stephen A. Hetherington
IPC分类号： C01G2100
CPC分类号： C22B7/02 , C22B13/045 , Y02P10/212 , Y10S75/961 , Y10S106/01
摘要： The present invention relates to a process for treating fly ash/APC residues chlorides, sulphates, earth alkali metals selected from the group consisting of calcium, potassium, and sodium, and heavy metals selected from the group consisting of lead, which residues are obtained from air pollution control processes that utilize dry/semi-dry line injection, such that said residues may be disposed of as non-hazardous materials. The process comprises the sequential steps of: (a) washing and agitating the fly ash/APC residue (20) with water (50) to form a residue slurry containing solubilized lead salts and calcium chloride; (b) filtering (42) the residue slurry to remove a filtrate (46) having a pH of higher than about 11.8 and containing the solubilized lead salts and calcium chloride; and (c) recovering a first calcium enriched filter cake (44). The solubilized lead salts are then removed from the filtrate by the sub-steps of: (i) adding sufficient hydrochloric acid (58) to the filtrate to lower the pH thereof to between about 10 and 11; (ii) agitating the filtrate until a colour change from white to yellow occurs; (iii) adding additional sufficient hydrochloric acid to the filtrate so agitated to lower the pH to between about 7 and 8; (iv) filtering (82) the filtrate to remove a brine (86) containing calcium chloride; and (v) recovering a second yellow coloured, lead enriched filter cake (84).
摘要翻译：本发明涉及一种处理飞灰/ APC残留物的方法，其中氯化物，硫酸盐，选自钙，钾和钠的碱土金属以及选自铅的重金属，该残基从使用干/半干线注射的空气污染控制过程，使得所述残留物可以作为非危险材料处理。该方法包括以下顺序步骤：（a）用水（50）洗涤和搅拌飞灰/ APC残渣（20）以形成含有溶解的铅盐和氯化钙的残渣; （b）过滤（42）残余物浆料以除去pH高于约11.8并含有溶解的铅盐和氯化钙的滤液（46）; 和（c）回收第一钙富集滤饼（44）。然后通过以下子步骤从滤液中除去溶解的铅盐：（i）向滤液中加入足够的盐酸（58）以将其pH调节至约10至11; （ii）搅拌滤液直到发生从白色变为黄色的颜色; （iii）向滤液中加入额外的足够的盐酸，使之搅拌，将pH值降低至约7至8; （iv）过滤（82）滤液以除去含有氯化钙的盐水（86）; 和（v）回收第二黄色，富含铅的滤饼（84）。

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