Method for cleaning filter cloth of plate frame type sludge dehydrator

Abstract

The invention relates to a method for cleaning filter cloth of a plate frame type sludge dehydrator. The method comprises the following steps: adding a filter cloth cleaning agent with the adding concentration of 300 to 1000 mg / L into a pool at the front end of the plate frame type sludge dehydrator, mixing uniformly, injecting into a dehydrator filter plate, performing soaking treatment on the filter cloth for 0.5 to 1.5 hours, and directly entering normal sludge-removing operation without washing with clean water, wherein the filter cloth cleaning agent comprises 10 to 30 percent of 2-phosphate-1,2,4-butane tricarboxylate, 10 to 30 percent of hydroxy ethylenediphosphonic acid, 15 to 40 percent of acrylic acid-hydroxypropyl acrylate-2-acrylamide-2-methyl propylsulfonic acid copolymer, 0.5to 2 percent of fatty alcohol-polyoxyethylene ether and the balance of water. The dirt on the surface of the filter cloth is removed by the method provided by the invention, so that the original blocked and hardened filter cloth recovers elasticity, the service life of the filter cloth is prolonged, the operation cost of the dehydrator is reduced, and the method is safer and more effective compared with the conventional method; meanwhile, equipment and metal pipelines can be protected and washing sewage is avoided.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a filter cloth cleaning agent and a cleaning method of a plate and frame sludge dewatering machine. Background technique [0002] Due to the characteristics of small dust particle size and low dust content, the converter steelmaking flue gas dedusting water system mostly uses a plate and frame sludge dewatering machine. During the operation of the dehydrator, due to the deposition of sludge and scale, the filter cloth is often blocked and hardened, which makes it difficult for the water in the mud to enter the drainage tank through the filter cloth when the plate and frame are pressed into the mud, so grouting often occurs during operation. [0003] The conventional solution is to stop the operation of the dehydrator, remove and replace with a new filter cloth, which requires relatively high time and labor costs. If the replacement is not timely, it will also...

AI Technical Summary

Problems solved by technology

[0004] Therefore, the conventional cleaning method of using inorganic acid to clean the filter cloth has certain safety hazards, which affects the service life of the filter cloth; in addition, since the dehydrator pipes and valves are made of carbon steel or cast iron, cleaning with inorganic acid is easy to cause Corrosion of equipment; moreover, a certain amount of flushing sewage will be produced