Revisiting the Kazakhstan natural sorbents modification

Kazakhstan ranks second in the world in natural uranium reserves and a leading position in its production. Hydrometallurgical processing of uranium raw materials results in a significant amount of liquid technogenic wastes containing radionuclides. Sorption cleaning methods for these wastes are the most effective ones. However, the high cost of synthetic sorbents and the low sorption capacity of natural ones is a deterrent to their use. So, to increase the sorption capacity of natural sorbents by their modification is an urgent problem. In this paper, a method to modify Kazakhstani natural zeolite was proposed by us and previously not investigated. Also the data of physicochemical studies of the initial raw material and the modified product was given and the increase in the natural sorbent specific surface in the modification process was demonstrated

Extraction Of Non-Ferrous And Noble Metals From Mill Tailing By Solutions In The Presence Of Oxidizing Agents

Optimal parameters of leaching of non-ferrous and noble metals from mill tailing by solutions in the presence of oxidizing agents (paramagnetic catalyst) are investigated.The optimum concentration of sulfuric acid and sodium cyanide was determined in the leaching of gold-containing mill tailings.It is shown that the presence of oxidizing agents in solutions leads to an increase in the extraction of metals into the solution. It was found that the extraction of gold, copper, zinc, lead and manganese during the process of conventional sulfuric acid leaching is significantly lower than during the presence of an oxidizing agent.Dissolution of copper, depending on the different concentration of sulfuric acid (g / dm3: 5.0, 10.0, 15.0, 20.0) showed that the degree of metal extraction by using oxidizing agents increases, respectively, 35.2%, 64.0%, 65.0%, 65.9%