CN1436587A - Regeneration process and apparatus for waste diatomite filter aid - Google Patents
Regeneration process and apparatus for waste diatomite filter aid Download PDFInfo
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- CN1436587A CN1436587A CN 02103021 CN02103021A CN1436587A CN 1436587 A CN1436587 A CN 1436587A CN 02103021 CN02103021 CN 02103021 CN 02103021 A CN02103021 A CN 02103021A CN 1436587 A CN1436587 A CN 1436587A
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- filter aid
- rotary kiln
- waste diatomite
- diatomite filter
- kiln
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Abstract
The present invention is the regeneration process and apparatus for waste diatomite filter aid. The regeneration process is to bake the filter cake containing waste diatomite filter aid inside one rotary kiln with material lifting blade made of refractory brick. The production apparatus is one complete system comprising four parts including separating and drying apparatus, airflow crushing, drying, sorting and recovering apparatus, baking rotary kiln, and airflow crushing, grading and recovering apparatus. The present invention is suitable for regenerating waste diatomite filter aid used in filtering beer, white spirit, beverage and organic solvent and may be also used in the production of filter aid with natural diatomite containing over 30% water as material.
Description
The invention provides a kind of renovation process and process units of waste diatomite filter aid, its renovation process comprises separation, predrying, pulverizing, pneumatic conveying drying, sorting, separation, recovery, roasting, pulverizing, classification, separation recovery and packing of product operation; Process units mainly by separate and predrying, air-flow pulverizes drying and sorting recovery, rotary kiln baking, jet mill grinding and recovery four equipment components constitute.The process technology that belongs to the inorganic material of chemical field.
Super-cell has been widely used in the liquid filtering of industries such as chemical industry, light industry, medicine, wine brewing.The waste water that contains useless filter aid after the filtration is discharged.Not only waste resource but also contaminated environment.Only beer industry calculates by the minimum standard of ton wine consumption filter aid 1kg, and the whole nation will abandon 80,000 tons of useless filter aids every year.Useless filter aid can be by regeneration after the high-temperature roasting.But existing filter aid production technology [document 1] can not be directly used in the regeneration of filter aid.This be because: (1) filter aid has in use been held back a large amount of organic impurities, separate the back filter and in moisture about 50%; Surpass 30% and material is moisture, prior art just can't directly be pulverized the promoting the circulation of qi fluidized drying of going forward side by side.If adopt the natural drying method predrying, the organic matter colloid in the filter also not only influences gas permeability, causes drying effect poor, and the rotten contaminated environment of can fermenting.(2) rotary kiln of inner wall smooth is adopted in existing filter aid production, and has added flux and burnt till under 950-1050 ℃ high temperature.If the regeneration of useless filter aid is burnt till under this high temperature, certainly will cause the further contraction of diatom test, skeletal density further increases, and influences the performance of filter aid.Suitably reduce firing temperature,, good fluidity low because of material caking property, and can not stir, cause fully oxidation of organic matter, cause carbon deposit, do not reach the purpose of holomorphosis.
At the above-mentioned deficiency of prior art, the present invention improves on the basis of existing technology, can be raw material with the waste water that contains filter aid, directly processes, and prepares qualified super-cell.
The present invention adopts following technical measures to realize above-mentioned purpose.
1. adopt horizontal screw unloading precipitation centrifuge to separate filter also, realize working continuously.
2. will filter drying also and carry out in two steps, the infrared drying tunnel that the flue gas that elder generation generates with coal gas or combustion of natural gas heats is to filter and carry out predrying; The flue gas air inlet temperature is about 700 ℃, and air outlet temperature is about 400 ℃; The flue gas of utilizing drying tunnel to discharge is originated as the hot blast of pneumatic conveying drying, carries out the pneumatic conveying drying in second step.Pneumatic conveying drying divides two-stage, and first order intake air temperature is at 300-350 ℃, and second level intake air temperature is regulated according to the dry materials situation.
3. selecting the cylindrical shell draw ratio for use is 10-12: 1 rotary kiln; Build by laying bricks or stones with 6 insulating brick and 4 refractory brick of wearing spill mud ditch (except the end, the end face, groove is at the middle part, and the wide 50-60mm degree of depth is generally at 5-10mm) of wearing spill mud ditch (groove is at the middle part, width 50-60mm, the degree of depth is generally at 5-10mm); Play the shaped form lifting blade of building some (bar is several directly to be determined according to kiln) five equilibrium kiln internal diameter circumference to the rotary kiln middle part by laying bricks or stones in 4 brick strong points of distance kiln tail (about 1m); The high 100-200mm of brick rib of projection (according to kiln footpath size decision), and make the rotation direction identical (Fig. 1, Fig. 2) of its bending direction and rotary kiln.
4. when not adding flux, the burning zone temperature of control rotary kiln is at 850-900 ℃, and regulates the rotating speed of rotary kiln, make material the clinkering zone retention time about 1 hour; Add cosolvent, the rotary kiln burning zone temperature is controlled at 900-950 ℃.
5. the adjustable speed air current classifying is partly adopted in the finished product classification, the coarse fodder output of first order grading machine enters the sorting of second level grading machine after secondary is pulverized, the coarse fodder output of second level grader enters the sorting of impurity separator after pulverizing for the third time, and under the air supporting state waste, available mixture flow returns the sorting that circulates of second level grading machine.
6. according to the measurement result of product, add a spot of flux in case of necessity.
By above-mentioned measure, realized filter and separation, predrying, pulverizing and pneumatic conveying drying, reduced heat exhaustion; Improve the roasting effect of material, made the organic matter complete oxidation in the filter also, avoided the high temperature sintering of diatom test to shrink again; Prepared qualified regeneration filter aid.
Accompanying drawing 3 is technological process of the present invention and process units schematic diagram.
Main technique flow process of the present invention is as follows:
Centrifugation-predrying-pulverizing-pneumatic conveying drying-sorting-separation recovery-roasting-pulverizing-classification-separation-packing.
Process units is constructed as follows:
Centrifuge (1) slag notch is to belt feeder (2) feed end; Belt feeder (2) delivery end is to the feed end of belt feeder (3).Belt feeder (3) places infrared drying tunnel (4), and its conveyer belt adopts heatproof adhesive tape or steel band; Discharge end is to pulverizer (9) import.The import of drying tunnel flue gas connects hot-blast stove (7) gas outlet.Hot-blast stove is equipped with burner (6), provides fuel by gas burner or gas pipeline; Blower fan (5) air supply.The steam (vapor) outlet of the drying tunnel machine (8) of giving a dinner for a visitor from afar by the road; Blower fan (8) outlet connects outdoor by the road.The drying tunnel flue gas outlet is connected with the discharging opening of pulverizer (9) and the import of blower fan (10) by the road; Blower fan (10) outlet connects drying tube (11) import.The drying tube outlet connects separator (12) import.The outlet of separator (12) coarse fodder connects pulverizer (14) import through valve (13); The fines outlet connects separator (19) import by the road.Pulverizer (14) discharging opening connects the top charging aperture of four-way pipe fitting, and the Horizontal Exit of four-way connects separator (17) import; Horizontal air inlet connects valve (15); The below air inlet of four-way connects valve (16).Valve (15) other end is to atmosphere.The pipeline of another termination drying tunnel flue gas outlet of valve (16).Separator (17) fines exports the import that connects separator (12) through blower fan (18), and the waste mouth connects the waste material bucket.Separator (19) discharge port connects valve (20), and valve outlet port connects screw machine (21) charging aperture; The separator gas outlet machine (22) of giving a dinner for a visitor from afar by the road.Blower fan (22) outlet connects deduster (23) air inlet.The deduster discharge port connects screw machine (24), gas outlet machine (27) import of giving a dinner for a visitor from afar.Blower fan (27) outlet connects chimney by the road.Screw machine (24) discharging opening connects valve (25), and valve outlet port connects another charging aperture of screw machine (21).Screw machine (21) discharging opening connects screw machine (26) charging aperture.Screw machine (26) outlet connects kiln tail (28), and the kiln tail is installed on the rotary kiln (29); Machine (10) import of giving a dinner for a visitor from afar by the road of kiln tail end opening.The other end of kiln is equipped with kiln hood (30).Burner (31) is installed on the kiln hood.Burner is a fuel with coal gas or natural gas, and air is supplied with by blower fan (32).Machine (33) import of giving a dinner for a visitor from afar of kiln hood feed opening, the blower fan outlet connects first order grader (34) air inlet.The outlet of grader (34) fines connects separator (41) import, and the coarse fodder outlet connects pulverizer (35) import; Pulverizer exports machine (36) import of giving a dinner for a visitor from afar; The blower fan outlet connects second level grader (37) air inlet.The outlet of grader (37) fines connects separator (41) import, and the coarse fodder outlet connects pulverizer (38) import; Pulverizer exports machine (39) import of giving a dinner for a visitor from afar; The blower fan outlet connects impurity separator (40) import.The outlet of impurity separator coarse fodder connects the waste material bucket; Fines exports machine (36) import of giving a dinner for a visitor from afar.Separator (41) discharge port connects finished bin (43) through valve (42), gas outlet machine (44) import of giving a dinner for a visitor from afar; The blower fan outlet connects deduster (45) air inlet.The deduster discharge port connects screw machine (46) import, gas outlet machine (47) import of giving a dinner for a visitor from afar; The blower fan outlet connects chimney.So constituted complete process units.
Fig. 1 and Fig. 2 are respectively the radial section and the axial section schematic diagram of rotary kiln.Kiln body box hat (1) and the middle shell wall slit (2) that forms of insulating brick-layer (3) have vertical mud pin (5) fixing therebetween.Insulating brick in the ranks radial slot (11) has circumference mud pin (8) fixing; Going together, laterally seam (12) is fixing by vertical mud pin (13) between adjacent insulating brick.Insulating brick and fire brick layer break joint (10) have mud pin (9) fixing.The circumference mud pin (7) that radially is sewed with between colleague's refractory brick is fixed; Laterally seam (14) has vertical mud pin (15) fixing.Lifting blade (16) is securely fixed in the rotary kiln masonry; End to the rotary kiln center from the 5th brick of kiln tail.
Further describe technical characterictic of the present invention by the following examples.
Produce 5000 tons of regeneration filter aid production lines per year.Select WL-450 type spiral discharge sedimentation centrifuge for use.Infrared drying tunnel adopts ZrO
2-SiC radiative material is the fuel heating with the every coal gas of marking rice 1200 kilocalories of calorific value.Rotary kiln is of a size of Φ 1.8m * 18m, ends to the rotary kiln center from kiln tail 1m place, builds 6 of the lifting blade curves that high kiln discharge inwall 187mm and five equilibrium kiln internal diameter circumference are arranged.All the other equipment are by technological design type selecting of the present invention or self-control.Concrete production process is as follows:
The filter that centrifugation goes out is also moisture about 50%, after infrared drying tunnel is predrying, and the moisture 25-30% that reduces to.Through pulverizing, pneumatic conveying drying and sorting, the material butt contains organic matter about 10%.The dry material powder enters behind the rotary kiln and to be stopped and to scrape by lifting blade and take up, and stirs to kiln tail direction, makes material fully contact the kiln wall and air is heated, and temperature takes fire after reaching the organic substance burning-point.When material enters 850-900 ℃ of kiln district, there is not the carbon deposit of completing combustion to be oxidized to carbon dioxide in the diatom test hole.This moment, the material surface began adhesion, formed the material piece that differs in size.Burned grog enters the crushing and classification system through the kiln hood hopper.Regulate the critical particle diameter of grader according to product requirement.Grog is through the two-stage air current classifying, and qualified materials flow enters the finished product separator; Underproof materials flow enters the sorting of impurity separator after pulverizing, discard residue again; The sorting that circulates of second level grader is returned in available materials flow.Fine product are reclaimed by deduster, and basic clean air enters atmosphere.
According to instructions for use,, can before pneumatic conveying drying, add a certain proportion of flux to improve the whiteness of permeability and product for the less useless filter aid of permeability.At this moment, the rotary kiln burning zone temperature is controlled in the 900-950 ℃ of scope.Prepared filter aid physical and chemical index is as follows under the process conditions of the present invention's regulation:
Color: whitewash or white;
Bulk density: 0.40-0.45g/cm
3
Skeletal density: 2.1-2.3g/cm
3
Permeability: 1.5-4.0Darcy;
Salt acid-soluble substance :≤3%;
PH value: 7.0-9.0;
As
2O
3, PPm :≤4 (japanese food interpolation standard A s
2O
3≤ 4);
Pb, PPm :≤6 (japanese food adds the total heavy metal of standard≤50);
Hg，PPb：≤20。
By test data as seen, the technical indicator of regeneration filter aid meets the requirements fully.Under the condition of not adding flux, because the regeneration sintering temperature is lower than the firing temperature of original product, the diatom test skeletal density remains unchanged, so the calcining product of fluxing and the natural mixed index of product filter aid of burning till used when the physical index of reconstituted product and former the filtration are basic identical.Add flux, product colour bleaches, and permeability increases.In theory, the number of times of useless filter aid regeneration is mainly by the content of beary metal decision, and total content of beary metal must not surpass the standard of the 50PPm of regulation.
Process equipment of the present invention is suitable for the regeneration of the useless filter aid of organic substance solution filtrations such as beer, liquor, beverage; Also can be used for moisture 30% the natural diatom original soil of surpassing is the production of the filter aid of raw material.
List of references: [1] PROCESS FLOW DIAGRAM CELITE PLANT LINJING, CHINA
Claims (4)
1. the renovation process of a waste diatomite filter aid is characterized in that utilizing the filter that contains the waste diatomite filter aid and is raw material, and burns till in the rotary kiln of band refractory brick lifting blade; When not adding flux, the rotary kiln burning zone temperature is 850-900 ℃; When adding a small amount of flux, the rotary kiln burning zone temperature is 900-950 ℃.
2. the regeneration process units of a waste diatomite filter aid, it is characterized in that by separate and predrying, air-flow pulverizes drying and sorting recovery, rotary kiln baking, jet mill grinding and recovery four equipment components have constituted a complete system.
3. the regeneration process units of the described waste diatomite filter aid of claim 3, its feature also is to have adopted by kiln tail 1m place and only rises to the rotary kiln center, it is high to have 100--200mm, the rotary kiln of some shaped form refractory brick lifting blades of five equilibrium rotary kiln internal diameter circumference.
4. the renovation process of claim 1,2,3 described waste diatomite filter aids and process units are applicable to the regeneration of the waste diatomite filter aid that organic substance solution such as beer, liquor, beverage filter; Also can be used for moisture 30% the natural diatom original soil of surpassing is the production of the filter aid of raw material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02103021 CN1436587A (en) | 2002-02-04 | 2002-02-04 | Regeneration process and apparatus for waste diatomite filter aid |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02103021 CN1436587A (en) | 2002-02-04 | 2002-02-04 | Regeneration process and apparatus for waste diatomite filter aid |
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| Publication Number | Publication Date |
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| CN1436587A true CN1436587A (en) | 2003-08-20 |
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| CN 02103021 Pending CN1436587A (en) | 2002-02-04 | 2002-02-04 | Regeneration process and apparatus for waste diatomite filter aid |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102527361A (en) * | 2012-01-09 | 2012-07-04 | 浙江永泉化学有限公司 | Regeneration method of diatomite |
| CN107159103A (en) * | 2017-05-16 | 2017-09-15 | 河北天诺再生资源利用有限公司 | Oil-containing waste diatomite filter aid circulation regeneration method and system |
| CN112516683A (en) * | 2020-12-16 | 2021-03-19 | 华润环保发展有限公司 | Waste diatomite filter aid regeneration system and method |
-
2002
- 2002-02-04 CN CN 02103021 patent/CN1436587A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102527361A (en) * | 2012-01-09 | 2012-07-04 | 浙江永泉化学有限公司 | Regeneration method of diatomite |
| CN107159103A (en) * | 2017-05-16 | 2017-09-15 | 河北天诺再生资源利用有限公司 | Oil-containing waste diatomite filter aid circulation regeneration method and system |
| CN112516683A (en) * | 2020-12-16 | 2021-03-19 | 华润环保发展有限公司 | Waste diatomite filter aid regeneration system and method |
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