Exploratory research of the resin bed harden during CO₂ + O₂ in-situ leaching solution

The problems of resin bed harden in C0₂ + O₂ in-situ leaching process affected the stability and continuity of the process. Reries of exploratory research were carried out for the reason. At first, By analyzing the harden materials which came from in-situ leaching solution, it was found that the harden materials were formed by the humic organic matter adhering to the surface of silt. Secondly, the water quality parameters of leaching solution and resin adsorption, such as COD and TOC, were tested in Tongliao test field. It was found that values of COD and TOC in tail liquid adsorption were lower than the values in original leaching solution. COD and TOC are two important indicators of the content of organic matter in water. The results of characterization showed that, the organic matter in leaching solution was an important reason which caused the resin bed harden. That the organic matter attached to the surface of sediment deposited on the surface of resin particles, or organic matter sticked together between resin particles, would make the resin bed harden. (authors)