Platinum metal recovery gauze during preparing process of nitric acid through ammoxidation

Abstract

The invention relates to platinum metal recovery gauze during preparing process of nitric acid through ammoxidation, the recovery gauze comprises the following components by weight percentage: 9-12% of Ni, 3-5% of Cu, 2% of Fe, 0-2% of Ag, 0-0.3% of Ce, and the balance of Pd. A filament diameter of the recovery gauze is 0.04-0.18mm, the required Ni content is 10%, and the recovery gauze has 3-6 layers. The platinum metal recovery gauze has the beneficial effect that before recovery gauze making, a proper amount of Ni, Cu, Fe, Ag and Ce can be added in palladium, so that machinery physical properties by individual usage of pure palladium can be improved, and the cracking phenomenon of the recovery gauze can be avoided during the usage.

Description

technical field [0001] The invention relates to a nitric acid production and application device, in particular to a platinum metal recovery net in the process of ammonia oxidation to nitric acid. Background technique [0002] In the production process of nitric acid, due to the ammonia oxidation process, the platinum alloy mesh that plays a catalytic role is in a high temperature state, and its platinum metal elements will be volatilized and lost in the form of oxides with the reactant gas flow, resulting in losses. Over time, the platinum alloy Due to the reduction of platinum content in the net, its catalytic activity gradually decreases, which affects the normal production. Due to the high price of precious metals such as platinum, the recovery of secondary platinum resources is extremely important. The existing main recovery method is to install a recovery net under the catalytic net, and use a heat-resistant stainless steel net as a liner above and below the recovery n...