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

A technology for recovering net and platinum metal, applied in the direction of nitrogen oxides/oxyacids, nitric acid, process efficiency improvement, etc., can solve the problems of cracking and high cost of palladium, and achieve the effect of improving mechanical and physical properties and avoiding cracking phenomenon.

Inactive Publication Date: 2015-07-01
上海派特贵金属环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the high cost of palladium, when the content is too high, the woven mesh will crack during use, and its mechanical and physical properties need to be improved.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] Palladium with a purity of 99.5%, other elements by weight percentage Ni9%, Cu3%, Fe2%, Ag2%, Ce0.1%, brushed mesh, and the diameter of the recycled mesh is 0.1mm. The 3 layers of woven recycling mesh were placed under the catalytic mesh. After 180 days of normal operation, the recovery network was disassembled to recover the adsorbed platinum, and the measured actual recovery / actual loss was 0.54, so the recovery rate was 54%.

Embodiment 2

[0012] Palladium with a purity of 99.5%, other elements by weight percentage Ni10%, Cu3%, Fe2%, Ag1%, Ce00.2%, brushed mesh, and the diameter of the recycled mesh is 0.08mm. Place 6 layers of the woven recycling net under the catalytic net. After 180 days of normal operation, the recovery network was disassembled to recover the adsorbed platinum, and the measured actual recovery / actual loss was 0.62, so the recovery rate was 62%.

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PUM

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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...

Claims

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Application Information

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IPC IPC(8): C22C5/04C22B11/00C22B7/00C01B21/38
CPCY02P10/20
Inventor 刘仕佳
Owner 上海派特贵金属环保科技有限公司
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