Vertical leaf filter filtering device and filter method and application thereof

Abstract

The invention relates to a vertical leaf filter filtering device and a filter method and application thereof. The filtering device comprises a filter shell, a filter plate, a head tank, a raw liquor tank, a filter cake tank, a fine liquor tank and a pressure pump, wherein raw liquor is filtered by the filter plate of the filter to obtain fine liquor which enters the head tank via a collector tube; the filter plate comprises a bar-shaped bracket and stainless steel filament filter cloth, wherein the bar-shaped bracket is installed between two layers of filter cloth and is provided with filter tanks which alternately arranged convexly and concavely; the collector tube is provided with a horizontal groove; the bar-shaped bracket is communicated with the collector tube by the horizontal groove; and the filter cloth is covered on the collector tube. The filter method is in periodic operation and is divided into the following steps: the step of feeding and hanging mud: lasting for 4-7 min; sodium aluminate raw liquor enters the leaf filter from the raw liquor tank and forms a filter layer on the filter plate by filter pressing; turbid liquid penetrating through the filter layer returns to the raw liquor tank by a reflux valve; the normal filter step: filtrate penetrating through the filter layer is fine liquor, and the fine liquor enters the head tank; and the final step of removing cakes under decompression and recovery. The invention uses stainless steel filament filter cloth to replace polypropylene monofilament cloth, so that the service life of the filter cloth is greatly prolonged; meanwhile, the stainless steel filament filter cloth can be washed easily by alkali with short time; the number of the filter cloth can be 1600-1800 meshes, and the filter cloth has the advantages of high temperature resistance, no deformation, no contraction, long service life and the like. The filter method shortens period, obviously improves yield and has good economic benefit.

Description

technical field [0001] The invention relates to a filter device, in particular to a filter device of a vertical leaf filter and a method and application thereof for filtering sodium aluminate solution. Background technique [0002] In the process of alumina production, the alumina in the ore is ground and dissolved to obtain the eluate. After the eluate is diluted, it is separated by sedimentation to obtain a crude liquid. The crude liquid is filtered through a filter to remove red mud particles, etc. After the suspension, the qualified semen is obtained and enters the follow-up section. The main equipment for filtering crude liquid includes the traditional Kelly leaf filter and the vertical leaf filter that has been used in recent years. [0003] At present, the vertical leaf filter has a long filtration cycle and low working efficiency. The filter cloth used is polypropylene monofilament cloth. This kind of filter cloth has obvious disadvantages, that is, it is easy to de...

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Problems solved by technology

[0003] At present, the vertical leaf filter has a long filtration cycle and low working efficiency. The filter cloth used is polypropylene monofilament cloth. This kind of filter cloth has obvious disadvantages, that is, it is easy to deform at high temperature, and the later production capacity is low. Cloth cycle is short, filter cloth replacement time is long, labor intensity is high, and production efficiency is low. The leaf filter often needs to be shut down frequently, and the effective operation rate of the equipment is low, resulting in high production costs.

[0004] The current method of filtering sodium aluminate solution with leaf filter has long production cycle, low production capacity and low production efficiency, which cannot meet the needs of production

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