Treatment technology for carbide slag in wet-process acetylene production

Abstract

The invention discloses a treatment technology for carbide slag in wet-process acetylene production, comprising the following steps: a) recovery of acetylene gas in carbide slag slurry: conducting preliminary sedimentation separation on the carbide slag slurry, injecting the carbide slag slurry into a degassing tower through a slag slurry pump, and pumping gas from the top of the degassing tower by a vacuum pump to maintain a certain vacuum degree; b) press filtration and drying of carbide slag slurry: conducting press filtration on the carbide slag slurry after acetylene gas recovery by a filter press system, conducting pre-drying by a dryer, sending pre-dried carbide slag to a drying tower, fully mixing the pre-dried carbide slag with a high-temperature dry airflow sent by a blower in the tower under the action of an induced draft fan, and discharging particles along with an airflow from the top of the tower during rising of a swirling flow; and c) classification of carbide slag: sending the dried carbide slag to a solid powder classifier for separation of coarse and fine carbide slag. The technology of the invention mainly aims at the problem that the processing cost of carbideslag in wet-process acetylene production is high, and adopts a comprehensive treatment and utilization technology of carbide slag to realize recovery of acetylene gas and comprehensive utilization ofthe carbide slag.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a wet-process acetylene carbide slag treatment process. Background technique [0002] The dry acetylene process is now basically mature, but the service life of key equipment and defects in the manufacturing process lead to many system failures, especially in the crushing system, feeding seal, dust prevention and discharge system. The dry acetylene process requires calcium carbide particle size ≤ 3mm, and it needs to be crushed in three stages to meet the specified requirements. The iron in the calcium carbide is too easy to cause damage to the hammer head of the disc crusher and the trommel screen, and the system runs continuously and stably for a long period of time. The effect is poor. The wet acetylene process is relatively mature, and the production operation is relatively stable. And wet acetylene consumes 1.32t of calcium carbide per ton of acetylen...

AI Technical Summary

Problems solved by technology

At present, the calcium carbide slurry is generally introduced directly into the slurry tank and the concentration tank in the industry. Most of the acetylene gas in the slurry is discharged into the atmosphere, which has an unpleasant smell and deteriorates the operating environment. Moreover, the acetylene gas released from the slurry is flammable and explosive, and there are Potential safety hazards, at the same time, the direct discharge of this part of acetylene gas caused a certain loss of calcium carbide

[0004] In addition, even if the acetylene gas in the calcium carbide slag is recovered, the moisture content of the recovered acetylene gas is about 40%, which is an industrial waste that is difficult to handle

The traditional process adopts open belt transportation to transport the press-filtered carbide slag to the cement plant for cement production. The calcium carbide slag is used instead of limestone to make cement, but the water content in the carbide slag will increase the water content and viscosity of the cement raw material. As a result, the difficulty of transportation, storage, accurate batching and mechanical dehydration increases. It can be seen that the high water content of carbide slag slurry directly restricts the proportion of carbide slag instead of limestone and the normal operation of the entire production process.

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