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    • 8. 发明授权
    • Metallurgical dust recycle process
    • 冶金粉尘循环利用
    • US5912402A
    • 1999-06-15
    • US608726
    • 1996-02-29
    • William F. Drinkard, Jr.Hans J. Woerner
    • William F. Drinkard, Jr.Hans J. Woerner
    • B01D47/02C22B3/06C22B7/00C22B7/02C22B3/00
    • C22B7/006B01D47/02C22B3/065C22B7/02B01D2251/504Y02P10/234Y02P10/236
    • A treatment of metallurgical dust and recovery of valuable chemical commodities, comprising the steps of: leaching salts from the dust with water to create a washed EAF dust; reacting the washed EAF dust in a nitric acid solution resulting in a nearly complete dissolution of the zinc, cadmium, copper, magnesium, calcium, manganese and lead from a filtrate; removing iron from the filtrate by raising pH in the system with basic zinc carbonate; removing cadmium, copper and lead in an electrolytic cell, where copper and cadmium are collected at the cathode, and lead is collected at the anode; evaporating and decomposing the filtrate to obtain metal oxides and anhydrous calcium nitrate; leaching the solid residue with water to separate calcium nitrate in a marketable form; removing the zinc from the magnesium and manganese by leaching the residue with an amine solution; stripping the filtrate of ammonium carbonate to yield zinc precipitated as a zinc oxycarbonate; dividing the zinc oxycarbonate into a first stream and a second stream by reacting the zinc complex with acid to produce a zinc product, the first stream serving as a pH adjuster to precipitate iron, the second stream preparing highly pure zinc products for sale; and, separating a residue containing magnesium and manganese by dissolving magnesium in acid, whereby liquid filtrate contains marketable magnesium nitrate or sulfate. The nitric gases given off during the steps are recycled to nitric acid by a nitric recycle.
    • 一种处理冶金粉尘和回收有价值的化学物品的方法,其特征在于包括以下步骤:用水从灰尘中浸出盐以产生洗涤的EAF粉尘; 使洗涤的EAF粉尘在硝酸溶液中反应,导致滤液中的锌,镉,铜,镁,钙,锰和铅几乎完全溶解; 通过用碱式碳酸锌提高体系中的pH,从滤液中除去铁; 去除在阴极处收集铜和镉的电解池中的镉,铜和铅,铅在阳极收集; 蒸发并分解滤液,得到金属氧化物和无水硝酸钙; 用水浸出固体残渣,以可销售的形式分离硝酸钙; 通过用胺溶液浸出残留物从镁和锰中除去锌; 剥离碳酸铵滤液,得到沉淀的锌作为碳酸锌; 通过使锌络合物与酸反应产生锌产物,将碳酸氢锌分成第一料流和第二料流,第一料流用作pH调节剂以沉淀铁,第二料流制备高纯度锌产品出售; 并且通过将镁溶解在酸中来分离含有镁和锰的残余物,由此液体滤液含有市售的硝酸镁或硫酸盐。 在步骤中排出的硝酸气体通过硝酸回收再循环至硝酸。
    • 9. 发明授权
    • Method for producing copper arsenate compositions
    • 砷酸铜组合物的制备方法
    • US5026530A
    • 1991-06-25
    • US502564
    • 1990-03-30
    • William F. Drinkard, Jr.Hans J. Woerner
    • William F. Drinkard, Jr.Hans J. Woerner
    • B27K3/32C01G28/02
    • C01G28/02B27K3/32
    • A method of preparing copper arsenate compositions having unique advantges in lower cost and higher performance for use in preparing chromated copper arsenate wood preserving formulations. These copper arsenate compositions are insoluble copper arsenate in water or as a dry reactive powder, have a mol ratio of As.sub.2 O.sub.5 to CuO of 1:4, and is readily soluble in chromic acid to form CCA wood preservatives. This copper arsenate is prepared by reacting suitable copper-bearing materials with arsenic trioxide and air or oxygen in ammoniacal solutions. Either or both of the starting raw materials, i.e., the copper and the arsenic, may be very impure, which impure materials were heretofore unsuitable for the production of copper arsenate.
    • 一种制备具有独特优势的砷酸铜组合物的方法,其具有较低的成本和更高的性能,用于制备铬酸铜的木材保存配方。 这些砷酸铜组合物在水中不溶于砷酸铜或作为干燥反应性粉末,其As 2 O 5与CuO的摩尔比为1:4,并且易溶于铬酸以形成CCA木材防腐剂。 这种砷酸铜是通过使合适的含铜材料与三氧化砷和空气或氧气在氨溶液中反应来制备的。 起始原料,即铜和砷中的任一种或两者可能是非常不纯的,其不纯物质以前不适于生产砷酸铜。