Pre-leaching system for aluminum electrolysis waste cell lining

Abstract

A pre-leaching system for an aluminum electrolysis waste cell lining includes a sealed pre-leaching trough (5) mounted in a workshop (1), a discharge chute (7) connected to a material outlet of the sealed pre-leaching trough, a material outlet door (15) of which the opening is controlled by an electric hydraulic push rod (6) and arranged at the material outlet of the sealed pre-leaching trough, abelt conveyor (3) mounted above the pre-leaching trough, a feeding electric hoist (2) arranged above the belt conveyor, a tail gas absorption pipe(4) drawn from the top of the sealed pre-leaching trough and leads to the lower side of the sealed pre-leaching trough, a tail gas fan (8) connected to the tail gas absorption pipe, a tail gas pipe (9) connected with the tail gas fan, a first-stage waterwashing tower (10), a second-stage water washing tower (11), a first-stage sulphuric acid washing tower (12), and a second-stage sulphuric acid washing tower (13), wherein the first-stage water washing tower, the second-stage water washing tower, the first-stage sulphuric acid washing tower, and the second-stage sulphuric acid washing tower are arranged outside the workshop and sequentially communicate with one another, the back end of the tail gas pipe (9) communicates with an air inlet of the first-stage water washing tower (10), and the bottom of the sealed pre-leaching trough (5) is an inclined bottom inclined downward towards the direction of the material outlet. The pre-leaching system can effectively prevent ammonia leakage in the process of wet treatment of the aluminum electrolysis waste cell lining, thereby avoiding harm to the environment and operators.

Description

technical field [0001] The invention belongs to the technical field of aluminum electrolysis waste tank lining pretreatment system. Background technique [0002] Waste tank lining is in the process of aluminum electrolysis, due to the penetration and corrosion of the tank lining by high-temperature electrolyte, the lining structure of the aluminum electrolytic tank is deformed, cracked, etc., and the high-temperature aluminum liquid and electrolyte penetrate into the tank from these deformed and cracked cracks Lining, resulting in the failure of normal production of the electrolytic cell and the repair of the cell. Due to the electrochemical reaction of the tank lining with the electrolyte at high temperature for a long time, a large amount of fluoride and a certain amount of harmful substances are adsorbed, and some toxic substances are also generated at the same time, which becomes a factor that causes harm to the environment during storage. How to treat waste tank lining...

AI Technical Summary

Problems solved by technology

[0003] There are many ways to deal with waste tank linings, which are basically divided into two categories: wet treatment and fire treatment. In the process of wet treatment, when the waste tank lining is broken and put into water and other solvents for leaching treatment, the waste tank lining A large amount of ammonia gas will be produced when it meets water, which will cause great harm to the environment and operators, and must be resolved

Images