Technology for recycling molybdenum, bismuth, cobalt and nickel from dead catalyst

Abstract

The invention discloses a technology for recycling molybdenum, bismuth, cobalt and nickel from a dead catalyst and belongs to the technical field of dead catalyst recycling and comprehensive utilization in the petroleum industry. According to the technology for recycling the molybdenum, the bismuth, the cobalt and the nickel from the dead catalyst, the molybdenum in the dead catalyst is dissolved in a solution through alkaline leaching, and then the molybdenum is separated from the solution through molybdenic acid precipitation, tetramolybdate conversion and ammonia neutralization; and acid leaching, hydrolyzing bismuth precipitation, oxidizing cobalt precipitation and sodium carbonate nickel precipitation are conducted on alkaline leaching residues containing the bismuth, the cobalt and the nickel, so that separation of the bismuth, the cobalt and the nickel is achieved. By the adoption of the technology for recycling the molybdenum, the bismuth, the cobalt and the nickel from the dead catalyst, the molybdenum, the bismuth, the cobalt and the nickel in the dead catalyst are recycled at the same time, the separation effect on the metals is good, and the leaching rate and the direct recovery rate both reach over 80%; and valuable metals in the dead catalyst are recycled in a product manner, the environment pollution caused by long-term piling storage of the dead catalyst or in the selling transport process of the dead catalyst in the petroleum industry is eliminated, and the cleaner production requirement is met.

Description

technical field [0001] The invention belongs to the technical field of recovery and comprehensive utilization of waste catalysts in the petroleum industry, and in particular relates to a process for simultaneously recovering molybdenum, bismuth, cobalt and nickel from waste catalysts. Background technique [0002] In the production process of the petroleum industry, catalysts are often used to speed up the reaction process, and as the use time increases, the catalysts will become aging, poisoned and deactivated. The main composition of these deactivated spent catalysts is calculated by weight: 30.08% molybdenum, 12.89% bismuth, 4.61% cobalt, and 2.56% nickel. Among them, molybdenum has the highest content, followed by bismuth, which is a high-value non-ferrous metal secondary raw material. [0003] At present, the treatment methods for waste catalysts produced in the petroleum industry include: 1. Rotary kiln volatilization method, which has a simple process flow, but cause...

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Problems solved by technology

[0003] At present, the treatment methods for waste catalysts produced in the petroleum industry include: 1. Rotary kiln volatilization method, which has a simple process flow, but causes great environmental pollution; also higher

Moreover, the above two methods are mainly used to process spent catalysts containing one or two metals, but there are deficiencies such as poor metal separation effect and low recovery rate for the treatment of spent catalysts containing three or more metals. Difficult to apply on a large scale

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