专利快速检索-快速检索全球专利，免费商用专利数据库-IPRDB

1. 发明授权

US4904459A Process for working up dusts which are produced in the electrothermal production of phosphorus 失效
标题翻译：处理在电热生产中产生的粉尘的工艺
公开(公告)号：US4904459A
公开(公告)日：1990-02-27
申请号：US385492
申请日：1989-07-26
申请人： Friedrich Kolkmann , Gunther Schimmel , Johannes Scheffer
发明人： Friedrich Kolkmann , Gunther Schimmel , Johannes Scheffer
IPC分类号： C01B25/027 , C01B25/30 , C01B25/41
CPC分类号： C01B25/416 , C01B25/027 , C01B25/30
摘要： A process is provided for working up dusts which have been precipitated electrostatically from the gas mixture composed essentially of carbon monoxide and phosphorus vapor produced in the electrothermal production of yellow phosphorus, which process comprises converting the dusts into a calcinate at 300.degree. to 800.degree. C. under oxidizing conditions in a first step, leaching the calcinate with phosphoric acid in a second step, adjusting the pH of the solution in phosphoric acid to 0 to 1.5 with sodium hydroxide solution in a third step, precipitating the sulfides of lead, copper and cadmium from the partially neutralized solution in phosphoric acid by adding sulfide and filtering them off in a fourth step, adjusting the pH of the filtered, partially neutralized solution in phosphoric acid to about 1.5 to 5.0 with sodium hydroxide solution and precipitating zinc sulfide, if necessary by adding further quantities of sulfide, and filtering it off in a fifth step, further neutralizing the sodium phosphate solution, if necessary after expelling excess sulfide, with sodium hydroxide solution and separating it from precipitated calcium compounds in a sixth step, and using the resultant sodium phosphate solution in this form in a known manner to produce sodium phosphate salts.
摘要翻译：提供了一种处理从黄磷的电热生产中产生的基本上由一氧化碳和磷蒸气组成的气体混合物静电析出的灰尘的方法，该方法包括在300-800℃下将粉尘转化成煅烧物在第一步骤的氧化条件下，在第二步中用磷酸浸出煅烧物，在第三步中用氢氧化钠溶液将磷酸溶液的pH调节至0至1.5，使铅，铜和通过添加硫化物并在第四步骤中将其从磷酸中的部分中和的溶液中的镉，在氢氧化钠溶液中将过滤的，部分中和的磷酸溶液的pH调节至约1.5至5.0，如果需要，沉淀硫化锌通过添加更多量的硫化物，并在第五步骤中过滤，进一步中和磷酸二氢钠溶液，如果需要，用氢氧化钠溶液排出过量的硫化物，并在第六步骤中将其与沉淀的钙化合物分离，并以已知的方式使用所得的这种形式的磷酸钠溶液来生产磷酸钠盐。

IPRDB

热门服务

关于我们

友情链接

联系方式