A kind of preparation method of chalk powder composite material enriched rhodium ion in tailings wastewater

Abstract

The invention belongs to the field of composite materials, and relates to a preparation method of a chalk-powder composite material for enriching rhodium ion in mine-tailing wastewater. The provided preparation method comprises filling holes of ammoniated brassica-campestris straws with modified chalk powder. The concrete technology comprises cleaning brassica-campestris straws, ammoniating, modifying chalk powder, and preparing the composite material. Compared with brassica-campestris straws, the composite material substantially improves in rhodium ion saturation enrichment amount, and overflow pollution of brassica-campestris straw organic carbon during water processing is avoided. The prepared composite material improves the rhodium ion enrichment amount to 111.7 mg / g, is applicable to process mine-tailing rhodium-containing wastewater, and is extensive in market prospect.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a method for preparing a chalk powder composite material enriched with rhodium ions in tailings wastewater. Background technique [0002] The chemical composition of the leaching solution of ionic rare earth mines is complex and has the following characteristics: ①The concentration is very low, and the concentration of rare earth in the leachate is generally 0.5~2 g / L. For the leaching tailings of rare earth mines, the concentration is lower, and the precipitation cost is high. Recycling, and the concentration of extraction and separation operations needs to reach 250 g / L, which brings many problems to the subsequent recovery of rare earths, and is not conducive to improving the recovery rate of rare earths; ②The content of impurities such as aluminum, iron and silicon is high, and oxalic acid Precipitate to form a soluble complex Re[Al(C 2 o 4 ) 3 ], e...

AI Technical Summary

Problems solved by technology

[0002] The chemical composition of the leaching solution of ionic rare earth mines is complex and has the following characteristics: ①The concentration is very low, and the concentration of rare earth in the leachate is generally 0.5~2 g / L. For the leaching tailings of rare earth mines, the concentration is lower, and the precipitation cost is high. Recycling, and the concentration of extraction and separation operations needs to reach 250 g / L, which brings many problems to the subsequent recovery of rare earths, and is not conducive to improving the recovery rate of rare earths; ②The content of impurities such as aluminum, iron and silicon is high, and oxalic acid Precipitate to form a soluble complex Re[Al(C 2 o 4 ) 3 ], etc., increasing the consumption of oxalic acid, the yield of rare earth is greatly reduced, if NH 4 HCO 3 Precipitation, impurities will form co-precipitates, affecting the purity of rare earth products; ③The daily processing capacity is large, and the volume of the leached solution is large. Usually, multiple sedimentation tanks are required to remove impurities and precipitate rare earths, and the load of post-processing operations is large. ; ④ The composition fluctuates greatly, and the grades of rare earth ores in different mining areas are also different, and there are changes in the process conditions and operating environment during leaching, so that the leached rare earth material liquid has different concentrations and chemical compositions. bad recycling