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公开(公告)号：US5743968A
公开(公告)日：1998-04-28
申请号：US821154
申请日：1997-03-20
摘要： A process for removing scale from stainless steel using an aqueous solution containing hydrogen peroxide and an inorganic acid, i.e., hydrochloric or sulfuric acid. A hot rolled or annealed stainless steel strip (10) covered with scale is immersed into hot inorganic acid contained within pickling tanks (12) and (14). Thereafter, the strip may have residual amounts of tightly adherent scale (11). This scale is activated by a solution containing the inorganic acid and hydrogen peroxide applied to the strip such as by a spray header (16) extending completely transversely across and positioned above the strip and another spray header (18) extending completely transversely across and positioned below the strip. It may be desirable to pass the activated strip through the hot inorganic acid again and reactivate the strip at very high line speeds to insure complete removal of scale from the strip. Any hydrogen peroxide spray dripping from the strip is collected on a catch pan (30) and flowed into a tank (28). Preferably, the collected spent aqueous solution containing the inorganic acid and spent hydrogen peroxide is disposed in the pickling tanks. The aqueous solution aids in the removal of any residual scale and smut remaining on the strip thereby improving the cleanliness of the pickled strip.
摘要翻译： 使用含有过氧化氢和无机酸（即盐酸或硫酸）的水溶液从不锈钢去除垢的方法。 用鳞片覆盖的热轧或退火的不锈钢带（10）浸入酸洗槽（12）和（14）中所含的热无机酸中。 此后，条带可能具有残留量的紧密附着标尺（11）。 该标尺由含有无机酸和过氧化氢的溶液激活，例如通过完全横向延伸并定位在条带上方的喷头（16）和另一个完全横向延伸并位于下方的喷头（18） 带子。 可能需要使活化的带通过热无机酸再次以非常高的线速度重新激活条，以确保从带中完全去除垢。 将从条带滴落的任何过氧化氢喷雾液收集在捕集盘（30）上并流入罐（28）。 优选地，将收集的含有无机酸和废过氧化氢的废水溶液设置在酸洗槽中。 水溶液有助于去除残留在条带上的残留量和污迹，从而提高酸洗条的清洁度。
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公开(公告)号：US5106467A
公开(公告)日：1992-04-21
申请号：US593435
申请日：1990-10-05
CPC分类号： C22B19/24 , C22B19/30 , Y02P10/234
摘要： Caustic dezincing galvanized steel scrap. A dezincing plant includes a plurality of tanks interconnected in series with steel scrap sequentially being moved through each of the tanks. The tanks contain a caustic leaching solution including an oxidant with the leaching solution being circulated through each of the tanks in a direction opposite to the movement of the scrap. Fresh scrap initially is exposed to a partially depleted leaching solution with the oxidant concentration of the leaching solution increasing as the scrap moves through the series of tanks. Leaching solution depleted of its oxidant is transferred to an electrolytic cell where zinc is removed and plated as metallic zinc powder onto a cathode. The leaching solution is recycled by removing zinc. The chemistry of the leaching solution is controlled so that sufficient free caustic is present to prevent passivating zinc coating on the scrap. Oxidant is added to the recycled solution and the caustic concentration is adjusted, if necessary, to have a total caustic concentration of at least 5 M and the recycled solution is returned to the last tank. Compressed scrap bales are dezinced and ready for use as a melting furnace charge material.
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公开(公告)号：US5702534A
公开(公告)日：1997-12-30
申请号：US667498
申请日：1996-05-24
摘要： A process for removing scale from stainless steel using an aqueous solution containing hydrogen peroxide. A hot rolled or annealed stainless steel strip (10) covered with scale is immersed into hot sulfuric acid contained within tanks (12) and (14). Thereafter, the strip may have residual amounts of tightly adherent scale (11). This scale is activated by the aqueous solution containing hydrogen peroxide applied to the strip such as by a spray header (16) extending completely transversely across and positioned above the strip and another spray header (18) extending completely transversely across and positioned below the strip. Any peroxide spray dripping from the, strip is collected on a catch pan (30) and flowed into a tank (28). Preferably, the peroxide solution is a dilute concentration of the acid in tanks (12) and (14). The hydrochloric acid removes smut from the strip formed by the sulfuric acid to improve the cleanliness of the pickled strip.
摘要翻译： 使用含有过氧化氢的水溶液从不锈钢去除垢的方法。 用鳞片覆盖的热轧或退火的不锈钢带（10）浸入容器（12）和（14）中所含的热硫酸中。 此后，条带可能具有残留量的紧密附着标尺（11）。 该标尺由含有过氧化氢的水溶液活化，例如通过完全横向延伸穿过条带的喷头（16）和位于条带上方的另一个喷雾头（18）横穿横穿并位于条带下方的喷头。 将从条带滴落的任何过氧化物喷雾液收集在捕集盘（30）上并流入罐（28）。 优选地，过氧化物溶液是罐（12）和（14）中酸的稀释浓度。 盐酸从硫酸形成的条上除去污点，以提高酸洗条的清洁度。
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公开(公告)号：US5175502A
公开(公告)日：1992-12-29
申请号：US583054
申请日：1990-09-14
摘要： Acid concentrations are determined by the method and apparatus, particularly HCl acid for picking ferrous material. Specific gravity measurements are made on acid samples, diluted acid samples and water. Conductivity measurements are conducted on the diluted acid samples. The water dilution minimizes the influence of the metal salt in the sample to improve the conductivity measurements. The system calculates the acid concentration by a series of approximations using the conductivity data and the acid concentration - conductivity relationships to provide an accurate acid concentration which is easily automated by computer.
摘要翻译： 酸浓度通过方法和装置确定，特别是用于挑选黑色金属材料的HCl酸。 对酸性样品，稀酸样品和水进行比重测量。 对稀酸样品进行电导率测量。 水稀释使金属盐在样品中的影响最小化，以改善电导率测量。 该系统使用电导率数据和酸浓度 - 电导率关系通过一系列近似计算酸浓度，以提供可通过计算机轻松自动化的精确酸浓度。
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