Off-line cleaning method of filter press nylon filtration fabric based on iron ore concentrate slurry dehydration blocking invalidation

Abstract

The invention discloses an off-line cleaning method of filter press nylon filtration fabric based on iron ore concentrate slurry dehydration blocking invalidation, combining physical cleaning with chemical cleaning to lighten damage to filtration fabric nylon yarn and lower the filtration fabric consumption and product cost of iron ore mineral dressing. The off-line cleaning method specifically comprises the following steps: 1) physical cleaning: taking high-pressure water jet flow of 50-150 kg / cm2, which is provided by a plunger pump, to carry out double-face scanning-type cleaning to blocking filtration fabric; 2) chemical cleaning: dipping and reacting for 0.5-4 hours in chemical cleanout fluid composed of water, inorganic acid, accelerator, penetrant and corrosion inhibitor; and 3) surface reinforcement: carrying out surface reinforcement on the filtration fabric in diphenylamine or triethanolamine solution of which the concentration is 0.05-5%.

Description

Technical field: [0001] The invention relates to a cleaning method of a filter cloth, in particular to an off-line cleaning method of a nylon monofilament filter cloth of a filter press used for iron ore beneficiation after being clogged and invalidated by fine mineral powder. technical background: [0002] In recent years, in order to increase the production capacity of dehydration equipment, effectively control the moisture of filter cake and improve dehydration efficiency, metal mines and coal preparation enterprises have imported some large-scale automatic filter presses, such as LAROX filter presses from Finland and EIMCO filter presses from the United States. machine etc. When this type of filter press is applied to the dehydration of iron concentrate pulp, due to the high working pressure of the filter press (8kg / cm 2 ), the particle size of iron concentrate is small, and the domestic nylon monofilament filter cloth used as a commonly used filter medium will be block...

AI Technical Summary

Problems solved by technology

When this type of filter press is applied to the dehydration of iron concentrate pulp, due to the high working pressure of the filter press (8kg / cm 2 ), the particle size of iron concentrate is small, and the domestic nylon monofilament filter cloth used as a common filter medium will be blocked by fine ore powder particles after about 1,000 cycles of operation, resulting in reduced dehydration efficiency and forced to be replaced

However, the replaced filter cloth is actually less damaged, and the damage rate is less than 10%, which causes great waste if discarded.

[0006] 1) The large-scale automatic filter press itself has a simple device for online water flushing, but due to the low pressure of flushing water and uneven flushing, the effect of online flushing is not ideal, especially for fine iron ore squeezed into the filter cloth by high pressure Powder and iron ore powder oxidation deposits (Fe 2 o 3 ) cannot be cleared at all;

[0007] 2) The large-scale automatic filter press has a large number of filter plates and a large area of ​​filter cloth. If an external small cleaning device is installed to clean each filter cloth one by one, the cleaning cycle will be long, which will affect the normal operation efficiency of the equipment;

[0008] 3) The structure of the external large-scale cleaning device is complicated, and the on-site layout is difficult. It is also difficult to remove the iron ore powder oxide deposits (Fe 2 o 3 )

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