CN2465765Y

CN2465765Y - Vacuum filter for filtering aluminmum sulfate slurry

Info

Publication number: CN2465765Y
Application number: CN 01201948
Authority: CN
Inventors: 郭星军
Original assignee: JIXING CHEMICAL INDUSTRY Co Ltd XINGTAI CITY
Current assignee: JIXING CHEMICAL INDUSTRY Co Ltd XINGTAI CITY
Priority date: 2001-02-05
Filing date: 2001-02-05
Publication date: 2001-12-19
Anticipated expiration: 2011-02-05

Abstract

The utility model relates to a vacuum filter for filtering aluminmum sulfate slurry, which relates to a vacuum filter for filtering aluminium sulfate slurry generated with bauxite, the filter residue content of the aluminium sulfate slurry is high (10%-20%), the granularity is small (100-300 meshes), and the resistance of filter cakes is large. The utility model is composed of a box body, a sieve plate, filter cloth, a dreg pushing plate, and a box cover, wherein, the sieve plate is provided with convex ribs and grooves, and the concave openings arranged on the dreg pushing plate are fit with the convex ribs. The filter cakes can be accumulated in the grooves by the dreg pushing plate, the filter cakes at the convex ribs is few, the resistance of the filter cakes can be reduced, the filter area is increased, and the filter speed is increased.

Description

A kind of vacuum filter that filters the aluminum sulfate slurries

The utility model relates to a kind of vacuum filter that filters slurries, is particularly producing in the alum technology with bauxite, is used for filtering the vacuum filter of aluminum sulfate slurries.

In the alum production technology, bauxite and sulfuric acid reaction generate liquid aluminium sulfate, and certain density aluminum sulfate solution and certain density potassium sulfate solution mutual mixing according to a certain percentage gets alum after after chemical reaction, crystallization, the drying.Silica in the bauxite is insoluble to sulfuric acid, and bauxite and sulfuric acid generate the aluminum sulfate slurries, contains a large amount of solia particle impurity based on silica in the slurries, must could use through separating removal of impurities.Separation method has filtration method and sedimentation.Slag liquid separate vacuum filter described in the Chinese patent publication number CN2117196U, the sieve plate of this filter is a planar structure, filter cloth is tiled in above the sieve plate, because content height (10%--20%), the granularity little (100--300 order) of impurity in the slurries, filter cake is covered on the filter cloth, along with thickening of filter cake, the very fast increase of filtration resistance, when filter cake thickness to 15 millimeter, filtrate just can not see through filter medium, must clear up filter cake continually, and labour intensity is big, also damage filter cloth easily, cause Lou filter.Among the Chinese patent publication number CN1076913A, separate sulfuric acid aluminium paste liquid and adopt sedimentation, earlier with big water gaging the aluminum sulfate slurry dilution after, adding flocculant, quiet heavy certain hour, one excessive layer is always arranged between supernatant layer and the sediment layer, excessively carry a large amount of aluminum sulfate solutions secretly in the layer, reduced effective rate of utilization, aluminum sulfate solution concentration is low, take a large amount of acidproof ponds, the production cost height.

The purpose of this utility model is: a kind of vacuum filter that filters the aluminum sulfate slurries is provided, it at high temperature (90-130 ℃) filter the aluminum sulfate slurries apace, reduce resistance of filter cake, reduce the filter cake clearing times, make aluminum sulfate concentration big (reaching 30%-40%) in the filtrate, improve the rate of filtration, reduce labour intensity, reduce production costs.

The purpose of this utility model is achieved in that

1, the casing of this vacuum filter, sieve plate, dreg pushing board, case lid adopt the glass fiber reinforced polypropylene injection moulding, filter cloth is selected polyster fibre plain weave 260 types for use, the size of the casing reaction Fu specification used with producing aluminum sulfate is complementary, its withstand corrosion, shock-resistant, high temperature resistant (130 ℃), good heat insulating, like this, the aluminum sulfate slurries of high temperature can directly be put in the filter from the reaction Fu.

2, the sieve plate of filter is made waveform, and protruding stupefied and groove is arranged on the sieve plate.With the plane sieve plate mutually specific energy enlarge 1 to 3 times of filter area, improve the rate of filtration, improve the sieve plate mechanical strength, increase the weight capacity of sieve plate.

3, the wall box inner face has stupefied, and stupefied inside horizontal projection forms rectangle frame, is used for supporting screening plate, and stupefied is one with sidewall.

4, be provided with dreg pushing board, the spill mouth is arranged on the dreg pushing board, protruding stupefied matching on spill mouth and the sieve plate, the push-and-pull dreg pushing board, can shift the filter cake of flange part in the groove onto, the filter cake thickness that keeps flange part is less than 8 millimeters, and the filter cloth of flange part has filter capacity preferably, and can reduce the number of times of cleaning filter cake.

5, face is provided with rock wool, pitch prill cloth heat-insulation layer under filter cabinet body sidewall outer surface and the case, keeps filter pulp and the higher temperature of filtrate, makes and filters smoothly, and filtrate is emitted smoothly.

It below is the accompanying drawing simple declaration.

Fig. 1 is the general illustration of vacuum filter.

Fig. 2 is the schematic diagram of casing.

Fig. 3 is the schematic diagram of monomer sieve plate.

Fig. 4 is the cross section view of two monomer sieve plates.

Fig. 5 is the dreg pushing board schematic diagram.

Fig. 6 is the schematic diagram of case lid.

Structure below in conjunction with description of drawings the utility model vacuum filter:

Fig. 1 is the general illustration of vacuum filter, and it is by casing 1, sieve plate 2, filter cloth 3, dreg pushing board 4, case lid 5, and the heat-insulation layer of casing appearance (not drawing among the figure) is formed.

Fig. 2 is the schematic diagram of casing 1, and casing 1 10 is formed the seam welding that each sidewall joins mutually, the handing-over seam welding at the bottom of each sidewall and the case between 10 at the bottom of by sidewall 6,7,8,9 and case.Sidewall 6,7,8,9 inner faces middle part has stupefied 11,12,13,14 respectively, stupefied cross section is right-angled trapezium 15, form rectangular frames for stupefied 11,12,13,14, can supporting screening plate 2, sieve plate 2 is divided into filter pulp chamber 20 and filtrate chamber 21 to casing, filtrate chamber's 21 side-walls have vacuum valve 16, be used for controlling the negative pressure of filtrate chamber 21, look liquid pipe 17, be used for observing the height on filtrate plane, air intake valve 18, bleeder valve 19.

Fig. 3 is a monomer sieve plate schematic diagram, and Fig. 4 is two monomer sieve plate cross section view.Sieve plate two

ends

22,23 are respectively located on stupefied 12,14, arrange full stupefied 12,14 side by side by several monomer sieve plates.Be uniform-distribution with sieve aperture 26 on the sieve plate, 8 millimeters of sieve aperture internal diameters, distance is 3 centimetres between the sieve aperture.Be covered with filter cloth 3 on the sieve plate, filter cloth adopts polyster fibre plain weave 260 types, and filter cloth is close to mutually with the waveform sieve plate.

Fig. 5 is the dreg pushing board signal, and spill mouth 27 is arranged on the dreg pushing board head 28, and spill mouth 27 matches with sieve plate protruding stupefied 24, and handle 29 is housed on the dreg pushing board, is used for operating dreg pushing board, can shift the filter cake on the sieve plate protruding stupefied 24 onto groove 25 places.

Fig. 6 is the schematic diagram of case lid 5, and it is made up of

several case lids

30,31,32,33,34,35.Be used for preventing that the slurries heat scatters and disappears, keep the filter pulp temperature.

The method of operating of the utility model vacuum filter, undertaken by following order:

1, open case lid 30, directly putting filter pulp chamber 20 into from reaction Fu diluted aluminum sulfate slurries, slurries cover whole sieve plates protruding stupefied after, open vacuum valve 16, filtrate chamber 21 is vacuumized, slurries cover case lid 30 after all having put from the reaction Fu.

2,

mobile case lid

30,31,32,33,34,35, push-and-pull dreg pushing board 4 is shifted filter cake on the sieve plate protruding stupefied 24 onto groove 25 places, controls each protruding stupefied 24 place's filter cake thickness less than 8 millimeters, after slurries exhaust, uses a small amount of hot water (＞90 ℃) flush cake again, suction filtration.

3, after filtration is finished, close vacuum valve 16, open intake valve 18, open baiting valve 19, filtrate is emitted, and makes next flow process and uses.

4, open all case lids, the cleaning filter residue, the arrangement filter cloth covers case lid, closes intake valve 18 and baiting valve 19.

The utility model vacuum filter adopts the waveform sieve plate, can enlarge filter area, and the waveform sieve plate is fluted, can accumulate filter cake, and the operation dreg pushing board keeps protruding stupefied part that filter capacity is preferably arranged, and waveform configuration can strengthen the anti-pressure ability of sieve plate.It can filter the aluminum sulfate slurries fast, and aluminum sulfate utilization rate height is simple to operate.

Example 1:

Use 2000 liters of K type enamel reaction Fus to produce aluminum sulfate, the utility model vacuum filter optimum size is: long 350 centimetres of casing, wide 180 centimetres, sidewall is high 95 centimetres, stupefied upper edge at the bottom of the case 30 centimetres, 20 centimetres of sieve plate waveform height, filter pulp chamber volume is about 3000 liters like this, 2000 liters of filtrate chamber's volumes, 12.6 square metres of filter areas.125 ℃ of the slurry temperatures of emitting from the reaction Fu are finished through filtration in 135 minutes.95 ℃ of filtrate temperature, 1950 liters of filtrates, sulfur acid aluminium 32.5%, proportion 1.34 grams per milliliters; 314.8 kilograms of filter cakes, sulfur acid aluminium 3.0%; The utilization rate 98.9% of aluminum sulfate.

Claims

1, a kind of vacuum filter that filters the aluminum sulfate slurries, this filter have sieve plate 2 that casing 1 is divided into filter pulp chamber 20 and filtrate chamber 21, are covered with filter cloth above the sieve plate 2, it is characterized in that: have protruding stupefied 24 and groove 25 on the sieve plate 2; The wall box middle part has stupefied 15; The indoor dreg pushing board 4 that is provided with of filter pulp has spill mouth 27 on the dreg pushing board, spill mouth 27 and protruding stupefied matching.

2, according to the described vacuum filter of claim 1, it is characterized in that: sieve plate 2 is combined by several monomer sieve plates, and sieve plate and casing are splits.