| 摘要 |
<p>A method of recovering platinum particles from the flow of the reaction gas in the process of nitric acid production comprising passing the reaction gas through a layer of sorbent formed by a granular composite material, containing calcium oxide and binding agent, which includes magnesium oxide and calcium chloride or/and magnesium chloride with the following components ratio, in weight %: calcium oxide 50-75 magnesium oxide 20-35 calcium chloride or/and magnesium chloride, converting to Cl- 5-15. A granular composite material for recovering platinum particles form the flow of the reaction gas in the process of nitric acid production contains calcium oxide and binding agent that includes magnesium oxide and calcium chloride or/and magnesium chloride with the following components ratio in the final product, in weight %: calcium oxide 50-75 magnesium oxide 20-35 calcium chloride or/and magnesium chloride, converting to Cl- 5 -15. The invention allows to reach the concentration of platinum metals in the used sorbent up to 2.5%, to obtain sorbent of the required composition and porosity, in form of granules of any required shape, to increase the sorbent strength and simplify the technology of the recovery of precious metals from the used sorbent.</p> |
