In order to greatly improve aluminium ore leaching efficiency and reduce the cost, factors such as production dimension, process design and material selection have been paid close attention to in the design and selection of aluminium ore leaching equipment. At present, the most common method used to prevent scale formation and clogging of the aluminium ore leaching tank is to regularly add corrosion inhibitors, scale control agents and other reagents, so as to form an effective combination of mechanical and chemical scale control measures.
Among them, mechanical scale control measures mainly refer to proper selection of equipment components, using reasonable water flow and reasonable installation to ensure smooth water circulation, wearing rust-proof equipment, etc. Chemical scale control measures mainly refer to the addition of scale control agents, corrosion inhibitors, dispersants and other special chemicals, so as to achieve the purpose of scale formation and clogging prevention.
The scale control measures for aluminium ore leaching equipment include salt-free scale inhibitors, phosphates, polyacrylamides and other organic polymers, organic and inorganic composite scale inhibitors, organic and organic scale inhibitors and organic and organic composite scale inhibitors. Scaling prevention measures should be adopted according to different operating conditions. In general, the selection of scale inhibitor should be based on the analysis of scale components, determination of the main deposit elements, and the characteristics of scale inhibitors. The corrosion inhibitors used in aluminium ore leaching equipment usually include polyphosphates, polyamines, polyoxyacylsilanes, polyphosphates, phosphate esters, polyacrylic acids and polyphosphoraminates.
The adjusting water water quality of the leaching tank of aluminium ore is the key to preventing scaling and clogging. Before entering the leaching tank of aluminium ore leaching equipment, the water should be treated. Generally, a multi-stage water treatment process is adopted, which includes tap water, deoxygenation and purification processes. The water quality of the leaching tank should be monitored regularly to correctly adjust the concentration of additives, avoid excessive additives and environmental pollution, and prevent scaling and clogging in the leaching tank.
The operational parameters and operation of aluminium ore leaching equipment should be adjusted in time, to ensure that the leaching operation of ore is at the optimum state, to reduce the residence time of the material, to ensure that the operating parameters in the bank are in the stable state, and to reduce the pH value of the leaching tank, due to the acid plasma of the metal ions in the pulp and the formation of the hydroxide scale materials, which is conducive to the formation of scale in the leaching tank.
The contact area between the leaching solutions and the materials should be increased as far as possible in the design of aluminium ore leaching equipment. Generally, efficient leaching process should adopt two or multi-stage leaching, to increase the contact area between leaching solution and ore material. At the same time, the leaching time should be appropriately extended, so as to achieve favorable leaching state and reduce the rate of scale formation and clogging.
In summary, the scale control and clogging prevention of aluminium ore leaching equipment require the reasonable design of process parameters, reasonable selection of material, time control of operation, reasonable selection and dosage of scale control and corrosion inhibitors, reasonable water quality, and comprehensive measures to actively and effectively prevent scale and clogging of equipment.
