Method for repairing polypropylene filter plate of plate-and-frame filter press

Abstract

The invention relates to a method for repairing a polypropylene filter plate of a plate-and-frame filter press, which effectively solves the repairing problem of the polypropylene filter plate of the plate-and-frame filter press. The method comprises the following steps: in a dustfree environment, placing the polypropylene filter plate in a level degree smaller than or equal to 0.05mm / m; with a wound hole as a center, and with a surface with the area being 4-10 times that of the wound hole as a cementing surface, vertically welding polypropylene welding rods on the periphery of the cementing surface to form a closed surface; roughening the closed surface, cleaning the closed surface with clear water, and finally quickly drying the closed surface by using a hot air gun; and putting tin foil paper under the bottom of the wound hole and flattening, pouring modified high-strength epoxy resin structural adhesive into the cementing surface to enable the adhesive-poured liquid level to be leveled with the upper edge of the closed surface, and placing in a dustproof, ventilated, dry and dark place for natural curing. The method is easy to operate and master and is straightforward. A cold bonding process is adopted for automatic binding repair, the original structure of the filter plate is not destroyed, and the method is safe and feasible. The wound repair gas tightness is good, the mechanical strength is high, and the chemical stability is good. The repair method is low in cost.

Description

technical field [0001] The invention relates to a method for repairing a polypropylene filter plate of a plate and frame filter press. Background technique [0002] In the process of producing bauxite concentrate by positive flotation of bauxite waste slag, the concentrate and tailings are dehydrated using a plate and frame filter press to remove the moisture in the concentrate and tailings through compaction, feeding, pressing, and unloading. . The filter plate of the plate and frame filter press is made of polypropylene, which is pressed after preparation. It has good mechanical properties and stable chemical properties. It has the characteristics of pressure resistance, heat resistance, corrosion resistance, non-toxicity, smooth surface, and good sealing. However, due to the sudden change of pressure, long-term pressure aging, medium leakage and erosion during the feeding and pressing process of the filter press, the polypropylene filter plate is perforated and damaged, ...

AI Technical Summary

Problems solved by technology

However, due to the sudden change of pressure, long-term pressure aging, medium leakage and erosion during the feeding and pressing process of the filter press, the polypropylene filter plate is perforated and damaged, and the damaged polypropylene filter plate is scrapped, resulting in a large consumption of the filter plate. And because of its high cost, the operating cost of the equipment is relatively high

Due to the production process, structure and material of the polypropylene filter plate, the damaged polypropylene filter plate is treated as waste at a very low price. There is no report on repairing and successfully reusing it in a plate and frame filter press.