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. 发明申请

WO1994018133A1 TREATMENT OF SOLID AND LIQUID EFFLUENTS FROM TAN-YARDS FOR REMOVING AND RECOVERING THE CHROMIUM CONTAINED IN THE EFFLUENTS 审中-公开
标题翻译：用于去除和回收在液体中所含的铬的固体和液体溶液的处理
公开(公告)号：WO1994018133A1
公开(公告)日：1994-08-18
申请号：PCT/ES1994000013
申请日：1994-02-11
申请人： CONSEJO SUPERIOR INVESTIGACIONES CIENTIFICAS , AMER AMEZAGA, Sebastián , AMUTIO POLO, Guillermo , COT COSP, Jaime , DE LA CUADRA HERRERA, Antonio , LIMPO GIL, José, Luis , LUIS MARTIN, Angel , MANICH BOU, Alberto
发明人： CONSEJO SUPERIOR INVESTIGACIONES CIENTIFICAS
IPC分类号： C02F09/00
CPC分类号： C02F1/66 , C02F1/722 , C02F2101/22 , C02F2103/24 , C02F2103/28
摘要： The present invention relates to the integral treatment of chromium containing wastes from tan-yards according to the diagram of figure (1). There is provided one or two solid (1) and/or liquid (2) effluents which contain chromium. The solid effluent is subjected to a treatment (4) with perborate (3) producing a chromium-free residue (5) which is treated by conventional methods (for example hydrolysis in order to produce gums or chelagen) and waters which contain the chromium present as Cr(VI). Said Cr(VI) is reduced to Cr(III) by reduction in acid medium at (6). In a reactor (7) the solution containing Cr(III) is treated continuously with an alkaline solution (8), to give waters with less than 1 ppm of Cr (9) and a pulp (10) containing Cr(OH)3.3H2O from which is obtained, by acidification with sulphuric acid, a concentrated solution of chromium sulphate reusable in the same tan-yard. The present invention provides for the precipitation of Cr(III) contained in solutions, by using magnesium hydroxide (or a mixture with NaOH); the chromium-containing solution is slowly and continuously added to another solution, maintained at a temperature between 60 and 63 DEG C, to which is also added the neutralizing agent. Thereby, the precipitate obtained has particular characteristics of solubility and settling which cannot be obtained in a precipitate produced with other neutralizers. In the solid wastes, the oxidation is performed by stirring these chopped wastes with an aqueous solution which contains a perborate in the proportion of at least 1.5 mol of BO3 per at-g of Cr contained in the residues (for example 2.35 g of NaBO3 per g of Cr), during a period of time longer than 10 minutes, the recommended amount of perborate to be used, if sodic salt is used, being from 3.3 to 3.7 g of NaBO3 per g of Cr contained in the residue to be treated and the recommended treatment time being 45 minutes. The perborate may be substituted by a mixture of oxygenated water, H2O2, and a borate (for example borax) in a solution whose pH must be comprised between 7.5 and 11.5, preferably between 8.5 and 9.5.
摘要翻译：本发明涉及根据图（1）的图表，对来自褐色庭院的含铬废物进行整体处理。提供了含有铬的一种或两种固体（1）和/或液体（2）流出物。对固体流出物进行处理（4），过硼酸盐（3）生产无铬残渣（5），其通过常规方法（例如水解以产生树胶或螯合物）和含有铬的水处理作为Cr（VI）。所述Cr（VI）通过在（6）的酸性介质中还原而还原成Cr（III）。在反应器（7）中，用碱性溶液（8）连续处理含有Cr（III）的溶液，得到含有少于1ppm Cr（9）的水和含有Cr（OH）3.3H 2 O的纸浆（10）通过硫酸酸化可以获得硫酸铬的浓缩溶液，其可以在相同的褐色场地中重复使用。本发明通过使用氢氧化镁（或与NaOH的混合物）来提供溶液中所含的Cr（III）的沉淀; 将含铬溶液缓慢地并连续地加入到另一种溶液中，保持在60至63℃的温度下，并加入中和剂。因此，所得到的沉淀物具有在用其它中和剂生成的沉淀物中不能获得的溶解性和沉降特性。在固体废物中，通过用含有过硼酸盐的水溶液搅拌这些切碎的废物来进行氧化，所述水溶液的比例至少为1.5摩尔BO 3 - ，每克残留物中所含的Cr（例如2.35克的NaBO 3 / g Cr），在超过10分钟的时间内，如果使用磺酸盐，则使用的过硼酸盐的推荐量为3.3至3.7g的NaBO 3 / g残渣中所含的Cr 治疗时间为45分钟。过硼酸盐可以在其pH必须在7.5和11.5之间，优选在8.5和9.5之间的溶液中由氧化水，H 2 O 2和硼酸盐（例如硼砂）的混合物代替。

IPRDB

热门服务

关于我们

友情链接

联系方式