Liu Qiang' Huang Kezhi (Shandong Aluminium Design Institute) has achieved good results.
In the production of zeolite 4A, a domestic chemical alumina company, the separation and washing equipment mostly uses plate and frame filter presses. Because of its shortcomings such as low production capacity, high probability of secondary pollution, severe on-site dripping, high noise, poor worker operating environment, labor intensity, and low degree of automation, it has been difficult to adapt to the competition requirements under market economy conditions.
Shandong Aluminum Corporation is currently building a new 100kt/a4A zeolite Production Line and plans to use a belt vacuum filter.
Filter structure shape. Performance Features The performance of the belt vacuum filter has the following features: a High filtration efficiency. The horizontal filter surface and the upper material are added. Due to the action of gravity, the large particle phase will first sink to the bottom to form a layer of filter aid, so that the filter cake structure is reasonable, the filter cloth is reduced in clogging, the filtration resistance is small, and the filtration efficiency is high.
b. The washing effect is good. The multi-stage countercurrent washing method can achieve the best washing effect, and a small amount of washing liquid can be used to obtain a high-quality filter cake. General washing recovery rate can reach 99. c. Filter cake thickness can be adjusted, moisture content is small, convenient removal.
The cake thickness can be arbitrarily adjusted (~12mm) according to the material needs. The production capacity of the equipment is improved.
d The filter cloth can be cleaned on both sides. Both the front and back of the filter cloth (also known as the filter belt) are provided with a water spray cleaning device, so that both positive and negative sides of the filter cloth can be effectively cleaned, thereby eliminating the filter cloth jam and prolonging the service life of the filter cloth.
e Flexible operation, low maintenance costs. During the production operation, the filter cake thickness, washing volume, vacuum degree and cycle time can be adjusted at will to obtain the best filtering effect. Since the filter cloth can work under severe conditions and has a long service life, maintenance costs and production costs are greatly reduced.
2 Application Effect 21 Process Flow The existing production process flow has been transformed to the characteristics of the belt filter, and the process equipment flow is shown.
4A zeolite production process flow (partial) schematic diagram After trial operation practice has proved that the filter with a reasonable process design to solve the 4A zeolite zeolite filtration and washing production of key technical issues. The sedimentation tank uses feed buffering and low-speed rake stirring to achieve a very good settling effect.
22 Technical Specifications Completion Process indicators are as follows: 26 tanks continuous discharge solids average 115. tanks continuous overflow average 1.94g/L mean liquid floatation average 1.875g/L filter cake moisture average 39.203 tank full base average 0.652g/L tank float average 0.831 a difference subtract method. The total number of pulping tanks was 149 tanks, and the filter press unloading was 73 vehicles with a capacity of (49 tanks X3.2t/slot-b filter cake thickness. The filter cake thickness was 8mm, the filter cake width was 1.9m, and the filter cloth speed was 5m/ Min, the ratio of filter cake 1 revolution time is calculated according to 2h, and the average value of moisture is 39.2%, and the capacity value can basically meet the production requirements from the completion of the process technical indicators. The disadvantage is that the continuous output of 26 tanks is low, This directly affects the capacity of the belt filter and the moisture content of the filter cake, which is improved by optimizing the process and modifying the 26 settlement tanks.
The production of 150m2 frame filter press is only equivalent to about 10m2 belt filter, regardless of the energy-saving, automation and upgrading of equipment for the belt filter to replace the frame filter press provides a very good practical basis.
Under the condition of 99, the pH value of the dried product is less than 11.0, which is better than the quality index of the frame filter press plus scrubbing.
3 After economic equipment is put into operation, the economic benefits are very significant. A single PBF-33m2/2000 belt filter replaces three plate and frame filter presses, and the per capita annual income of RMB 25,000 can be used to reduce labor costs. 4t of water per ton of zeolite can be saved. According to the single equipment 35kt/a capacity, the saving of water 140kt can save 2.45X14=343,000 yuan. With the belt filter rinsing and saving water, the corresponding saving of steam 35kt/a saves 60X yuan. The economic benefits are very substantial.
4 Concluding remarks Through more than one year of operation, PBF equipment has been applied to the production of 4A zeolite: the production operating environment is good, no noise, no high alkali steam; workers' labor intensity is significantly reduced; high production capacity (currently a PBF can replace two Plate and frame filter press, after the solid content is increased to 130g/L, each production capacity can reach 2.5~3.5 platen frame filter 1 filter cake thickness average leg capacity of alElectronicPubli machine) Light Compliance Secondary pollution opportunity f Small and easy real. Net is now automated.
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