The belt filter is an industrial machine used for the dewatering of sludge in solid and liquid separation processes, particularly in the chemical industry, mining and water treatment. Belt presses are also used to produce apple juice, cider and wine. The filtration process is mainly achieved by a pair of filter cloth and belt through a drum system. The system takes sludge or mud as raw material and separates it into filtrate and solid filter cake.
The belt filter is mainly used for dewatering sludge, fruit puree, juice and wine grapes from apples, pears and other fruits. Belt filters are used in municipal and industrial applications in a range of areas including municipal sewage and wastewater treatment, metallurgy and mining, steel mills, coal plants, and breweries. Dyeing and tanning as well as chemical and paper mills.
The use of the belt filter is limited to the sludge, paste or crushed fruit it can handle. Municipal sludge includes raw sludge, anaerobic digestion sludge and aerobic digestion sludge, alum sludge, lime softening sludge and river sludge. In industry, any sludge or mud comes from food processing waste, pulp and paper waste, chemical sludge, pharmaceutical waste, industrial waste treatment sludge and petrochina. These wastes may include mixed sludge, pulp, dust deposits, cleaned coal slime, biological sludge, primary sludge and straw, wood or waste pulp
Some dehydration goals include reducing volume to reduce transportation and storage costs, removing liquids before landfill treatment, reducing fuel requirements before further drying or incineration, producing sufficient composting materials, avoiding runoff and collection during land use, and optimizing other drying processes. Belt filters are specially designed for these special applications and feedstock. Increasing the temperature of the feed slurry will reduce the viscosity of the liquid phase. This is beneficial because it increases filtration speed and reduces moisture. The same advantage can be obtained by other drying methods.
The choice of belt is crucial to the function of the belt filter press, which can provide a variety of materials and fabrics. The cloth of the belt press should be opened as much as possible while maintaining the required degree of clarification of the filtrate or, if prepainted, to prevent prepainted losses. Lighter fabrics produce cleaner filtrate and do not clog quickly, but are significantly less durable and durable than heavier seamless fabrics and stitching bands. The joint strip wears down faster at the joint, causing roller and scraper wear. Ziplines and shear straps can also have a longer life with ziplines because of their good continuity. Seamless belts last the longest, but are more expensive. Also, make sure that the belt press is compatible with the seamless strip.
Cleaning the filter cake is a very critical stage, the thickness of the filter cake needs to be controlled or limited. The cleaning time of filter cake is the main factor. When the minimum filter cake discharge thickness is reached, the maximum filtration rate will occur. The washing time is increased by the square of the filter cake thickness ratio. For example, if the thickness of the filter cake is doubled, the washing time will be approximately quadrupled.