ADDITIVE-CONTAINING ALUMINOBOROSILICATE AND PROCESS FOR PRODUCING THE SAME

摘要

The long-term (terminal) storage of low- and medium-activity nuclear waste is an extremely important environmental issue. A significant amount of these types of waste are constituted by thick liquid or crystalline materials containing boric acid or sodium borate. Our invention provides a simple solution to the problem of solidifying waste material. The process according to the invention is relatively cheap, involves low volume increase, and the resulting solidified form has advantageous characteristics. The invention relates to producing an additive-containing aluminoborosilicate at low temperature, preferably at room temperature from the following components: a liquid alkali silicate, liquid and/or solid boric acid or borate, an aluminium-containing inorganic component, and at least one additive. The process for producing the material comprises the steps of producing a homogeneous liquid from the liquid components, producing a solid powder from the solid components, and gradually admixing the powder component to the liquid component.