CN109603300A - The method of low-grade diatomite production low bulk density composite filter aid - Google Patents
The method of low-grade diatomite production low bulk density composite filter aid Download PDFInfo
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- CN109603300A CN109603300A CN201811536864.XA CN201811536864A CN109603300A CN 109603300 A CN109603300 A CN 109603300A CN 201811536864 A CN201811536864 A CN 201811536864A CN 109603300 A CN109603300 A CN 109603300A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D37/00—Processes of filtration
- B01D37/02—Precoating the filter medium; Addition of filter aids to the liquid being filtered
Abstract
The present invention provides one kind using middle-low grade diatomite and perlite as raw material, the method for preparing low bulk density composite filter aid.It is characterized in that through drying, crushing with the middle-low grade diatomite of 70% or more dioxide-containing silica for a kind of raw material, compound material A is made in selection by winnowing, addition cosolvent, high-temperature calcination；Selecting high-temperature expansion rate in 10-30 times of perlite is another raw material, through drying, crushes, selection by winnowing, high-temperature calcination, compound material B is made.It takes raw material A obtained above and raw material B according to the market demand, is uniformly mixed by different proportion (weight ratio), that is, be combined into the filter aid product with the heap density that differs in size.Such as: using the ratio of 1:1, mixed heap density reaches 0.26g/ml, suitable with the heap level of density of high-quality super-cell.The present invention solves the problems, such as that high-quality filter aid cannot be produced because heap density is excessive by accounting for the most of middle-low grade diatomite of China's ore reserve.
Description
Technical field
The present invention relates to the high-quality composite filter aid preparation technical fields of low bulk density, and in particular to a kind of low-grade diatomite
The method for producing low bulk density composite filter aid.
Background technique
Super-cell is the universal filter aid for being most commonly used for being separated by solid-liquid separation purifying.Be widely used in drinks,
The industrial production sectors such as food, medicine, chemical industry, petroleum, environmental protection, sewage treatment.The annual consumption of super-cell in China
70% or more of entire filter aid is accounted for always, the importance that this also illustrates it in industrial production.The master of super-cell
Wanting advantage is: having good microcellular structure, particle diameter distribution, absorption property and resistance to compression.Therefore can not only make by filtrate
Body obtains preferable filtering velocity ratio, and fine suspended matter, colloidal substances can be filtered out etc., guarantee the clarity of filtrate.It is mainly lacked
Point is: (1) resource growing lack, because of the high-quality diatomite that production super-cell needs diatom content high, and China
The mineral resources overwhelming majority is the diatomite of middle-low grade, and high-quality diatomite is fewer and fewer, it is difficult to meet production requirement.(2) it filters
Speed is relatively slow, and heap density is larger, causes client to add by weight in and often falls flat, and more additions made again
Filter cost increase.Therefore exploitation new technology, makes full use of and accounts for the most of middle-low grade diatomite of resource reserve, produce heap
Density is smaller, the good filter aid of strainability, for many years the brainstorm subject always in industry.
The filter aid product of perlite production is the second largest serial filter aid for being only second to super-cell.Due to its money
Source distribution is extensive, production technology is easy, lower production costs, and heap density is small in addition, filtering velocity is high, iron ion and calcium ion solubility
The advantages such as small, increasingly cause extensive concern.The major defect of pearlite filtering aid is: (1) due to filtering particle itself
Lack corresponding micropore, therefore the effect of depth and adsorption capacity that filter are poor, clarity is lower.(2) filtering is mainly in particle
Between gap carry out, the resistance to compression of filter cake is poor during pressure filtration, and resistance of filter cake rises very fast, the easy tortoise of filtering layer
It splits, filter cake is easy to fall off, influences filter efficiency.(3) because the main body of filtering is not micropore but gap, cause product variety, specification
Deng allotment be very limited, cause product variety relatively simple, limit industrial application.
Generally speaking, currently, domestic super-cell is restricted by material quality, high-quality soil has already appeared that supply falls short of demand
Situation, and the most of middle-low grade diatomite of resource reserve is accounted for, it can't directly use, development and utilization need technically
Breakthrough.Difficult point urgently to be resolved first is that how to be effectively reduced its calcine product heap density issue.
Summary of the invention
In order to solve problem above, the present invention provides a kind of low-grade diatomite production low bulk density composite filter aids
Method the described method comprises the following steps:
(1) selecting middle-low grade diatomite of the SiO2 content more than or equal to 70% is raw material, after low temperature drying, bulk
Diatomite crushed 100-200 mesh, while be cleaned using light breeze selection by winnowing；The diatomite powder and granulated metal after selection by winnowing
After carbonate and granulated metal halide are sufficiently mixed uniformly, the high-temperature calcination under air environment obtains helping and melts firing product；It will help
Fuse finished product crushed, selection by winnowing, classification obtain heap density be greater than 0.49g/ml super-cell product A；
(2) it is 10-20% that selection SiO2 content, which is more than or equal to 70%, Al2O3 content, and Fe2O3 content is less than or equal to
1.5%, expansion rate is 10-30 times, and high quality pearl rock of the whiteness more than or equal to 70 ° is raw material, through low temperature drying, after crushing, is divided
Grade selection by winnowing goes out the granularity micro mist of 100 mesh or more；And it is sent into calcining furnace high-temperature calcination；Perlite powder after high-temperature calcination expands from
So cooling, then crushing, selection by winnowing, classification is made heap density and is less than or equal to 0.18g/ml expanded perlite filter aid product B；
(3) product A is uniformly mixed with product B according to different weight ratio, is obtained with different permeabilities and heap density
Low bulk density filter aid product.
Preferably, above-mentioned steps (1) middle-low grade diatomite refers to that dioxide-containing silica is
Preferably, blocky diatomite smashes it through 150 meshes in above-mentioned steps (1), and low temperature drying temperature is 200-400
DEG C, high-temperature calcination temperature is 900-1200 DEG C.
Preferably, blocky diatomite smashes it through 200 meshes in above-mentioned steps (1).
Preferably, in above-mentioned steps (1) metal carbonate by one of potassium carbonate, sodium carbonate, magnesium carbonate, calcium carbonate or
Two kinds and composition described above；Metal halide by magnesium fluoride, calcirm-fluoride, sodium fluoride, potassium fluoride, calcium chloride, magnesium chloride, sodium chloride,
One or both of potassium chloride and composition described above；The additive amount of the metal carbonate is the 1- of diatomite dry weight
10%；The additive amount of the metal halide is the 2-10% of diatomite dry weight.
Preferably, metal carbonate is potassium carbonate or sodium carbonate in above-mentioned steps (1), and the metal halide is fluorination
One of calcium, sodium chloride, potassium chloride or two kinds and composition described above.
Preferably, low temperature drying temperature is 250-350 DEG C in above-mentioned steps (2), and high-temperature calcination temperature is 1000-1300
DEG C, using coal gas or natural gas as fuel when calcining.
Preferably, pass through addition halide flux in above-mentioned steps (2) before pearlstone calcining to change perlite intensity, fit
The intensity requirement of product in different industrial uses is answered, the halide flux is by calcirm-fluoride, sodium fluoride, sodium chloride, potassium chloride, chlorine
Change one of magnesium or two kinds and composition described above, the halide flux additive amount is the 1-5% of perlite dry weight.
The invention has the benefit that
Preparing low bulk density composite filter aid is according to the market demand, the suitable filter produced with middle-low grade diatomite
The filter aid of speed and the expanded perlite filter aid of suitable filtering velocity carry out uniform mechanical mixture by different proportion, are guaranteeing filtrate
Under the premise of clarity and raising filtering filtering velocity, the heap density of composite filter aid is reduced to reasonable range to greatest extent.
To solve high-quality diatomite inadequate resource, quality decline, and the biggish middle-low grade diatomite of reserves can not be produced with density
The problem of filter aid low, strainability is good.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with implementation of the invention
Example, technical scheme in the embodiment of the invention is clearly and completely described.Based on the embodiments of the present invention, this field
Those of ordinary skill's every other embodiment obtained without creative efforts, belongs to protection of the present invention
Range.
Embodiment 1
Selecting dioxide-containing silica for 70% middle-low grade diatomite is raw material, after 300 DEG C of low temperature dryings, using logical
Blocky diatomite is crushed to 100 mesh with type diatomite pulverizer, while going out the impurity such as fine sand, clay through two-stage selection by winnowing.Through
(diatomite is for middle-low grade diatomite material addition 3wt% sodium carbonate and 5wt% sodium chloride after dry broken and selection by winnowing
100%) it, is calcined 1 hour under the conditions of 950 DEG C of temperature, cooled to room temperature.Crush, be classified heap density be 0.51g/ml
Super-cell is set as raw material A1。
Pearlite filtering aid raw material is produced:
Select SiO2Content is 70%, Al2O3Content 10%, Fe2O3Content 1.5%, expansion rate are 10 times, and whiteness is 70 °
High quality pearl rock be raw material, after 300 DEG C of low temperature dryings, using universal micro-powder crusher crushing and processing and selection by winnowing goes out 100
Purpose granularity micro mist.Enter calcining furnace high-temperature calcination, calcining furnace is using heating gas as fuel, and 1050 DEG C of calcination temperature, it is precious that expansion is made
Zhu Yan.Through crushing and processing, selection by winnowing processing, sieving and grading, obtaining heap density is≤0.178g/ml expanded perlite filter aid, setting
For raw material B1。
Composite filter aid is produced:
Take raw material A1With raw material B1It uniformly mixes by the weight ratio of 1:1 to get low bulk density composite filter aid.This implementation
The product heap density that example is produced is 0.28g/ml, permeability and 300#High-quality super-cell is suitable.
Embodiment 2
Selecting dioxide-containing silica for 80% middle-low grade diatomite is raw material, after 300 DEG C of low temperature dryings, using logical
Blocky diatomite is crushed to 200 mesh with type diatomite pulverizer, while going out the impurity such as fine sand, clay through two-stage selection by winnowing.Through
(diatomite is for middle-low grade diatomite material addition 3wt% sodium carbonate and 5wt% sodium chloride after dry broken and selection by winnowing
100%) it, is calcined 2 hours under the conditions of 950 DEG C of temperature, cooled to room temperature.Crush, be classified heap density be 0.51g/ml
Super-cell is set as raw material A2。
Pearlite filtering aid raw material is produced:
Select content for 80% or more, Al2O3Content 20%, Fe2O3Content is 1.0%, and expansion rate is white at 10-30 times
The high quality pearl rock of >=70 ° of degree is raw material, after 300 DEG C of low temperature dryings, utilizes universal micro-powder crusher crushing and processing and wind
Select the granularity micro mist greater than 100 mesh.Entering calcining furnace high-temperature calcination, calcining furnace is using heating gas as fuel, and 1050 DEG C of calcination temperature,
Expanded perlite is made.Through crushing and processing, selection by winnowing processing, sieving and grading, obtaining heap density is≤0.178g/ml expanded perlite
Filter aid is set as raw material B2。
Composite filter aid is produced:
Take raw material A2With raw material B2It uniformly mixes by the weight ratio of 1:1 to get low bulk density composite filter aid.This implementation
The product heap density that example is produced is 0.28g/ml, permeability and 300#High-quality super-cell is suitable.
Embodiment 3
Super-cell raw material is produced:
Selecting dioxide-containing silica for 70% middle-low grade diatomite is raw material, after 300 DEG C of low temperature dryings, using logical
Blocky diatomite is crushed to 100 mesh with type diatomite pulverizer, while going out the impurity such as fine sand, clay through two-stage selection by winnowing.Through
(diatomite is for middle-low grade diatomite material addition 4wt% sodium carbonate and 5wt% sodium chloride after dry broken and selection by winnowing
100%), calcination temperature is to calcine 1 hour at 980 DEG C, cooled to room temperature.It crushes, grading system obtains super-cell heap
Density is 0.51g/ml.It is set as raw material A3。
Pearlite filtering aid raw material is produced:
Select SiO2Content is 70%, Al2O3Content 10%, Fe2O3Content 1.5%, expansion rate are 10 times, and whiteness is 70 °
High quality pearl rock be raw material, after 300 DEG C of low temperature dryings, using universal micro-powder crusher crushing and processing and selection by winnowing goes out 100
Purpose granularity micro mist adds 1wt% sodium chloride, enters calcining furnace high-temperature calcination, calcining furnace is using heating gas as fuel, calcination temperature
1100 DEG C, expanded perlite is made.Through crushing and processing, selection by winnowing processing, sieving and grading, obtaining heap density is≤0.165g/ml expansion
Pearlite filtering aid is set as raw material B3。
Composite filter aid is produced:
Take raw material A3With raw material B3It uniformly mixes by the weight ratio of 1:1 to get low bulk density composite filter aid.This implementation
The product heap density that example is produced is 0.27g/ml, permeability and 500#High-quality super-cell is suitable.
Embodiment 4
Super-cell raw material is produced:
Selecting dioxide-containing silica for 80% middle-low grade diatomite is raw material, after 300 DEG C of low temperature dryings, using logical
Blocky diatomite is crushed to 200 mesh with type diatomite pulverizer, while going out the impurity such as fine sand, clay through two-stage selection by winnowing.Through
(diatomite is for middle-low grade diatomite material addition 4wt% sodium carbonate and 5wt% sodium chloride after dry broken and selection by winnowing
100%) it, is calcined 2 hours under the conditions of 950 DEG C of temperature, cooled to room temperature.Crush, be classified heap density be 0.51g/ml
Super-cell is set as raw material A4。
Pearlite filtering aid raw material is produced:
Select content for 80% or more, Al2O3Content 20%, Fe2O3Content is 1.0%, and expansion rate is white at 10-30 times
The high quality pearl rock of >=70 ° of degree is raw material, after 300 DEG C of low temperature dryings, utilizes universal micro-powder crusher crushing and processing and wind
The granularity micro mist greater than 100 mesh is selected, 1wt% sodium chloride is added, enters calcining furnace high-temperature calcination, calcining furnace is combustion with heating gas
1100 DEG C of calcination temperature, expanded perlite is made in material, through crushing and processing, selection by winnowing processing, sieving and grading, obtain heap density be≤
0.165g/ml expanded perlite filter aid, is set as raw material B4。
Composite filter aid is produced:
Take raw material A4With raw material B4It uniformly mixes by the weight ratio of 1:1 to get low bulk density composite filter aid.This implementation
The product heap density that example is produced is 0.27g/ml, permeability and 500#High-quality super-cell is suitable.
Embodiment 5
Super-cell raw material is produced:
Selecting dioxide-containing silica for 70% middle-low grade diatomite is raw material, after 300 DEG C of low temperature dryings, using logical
Blocky diatomite is crushed to 100 mesh with type diatomite pulverizer, while going out the impurity such as fine sand, clay through two-stage selection by winnowing.Through
(diatomite is for middle-low grade diatomite material addition 5wt% sodium carbonate and 5wt% sodium chloride after dry broken and selection by winnowing
100%) it, is calcined 1 hour under the conditions of 1030 DEG C of temperature, cooled to room temperature.It crushes, grading system obtains super-cell
Heap density is 0.49g/ml.It is set as raw material A5。
Pearlite filtering aid raw material is produced:
Select SiO2Content is 70%, Al2O3Content 10%, Fe2O3Content 1.5%, expansion rate are 10 times, and whiteness is 70 °
High quality pearl rock be raw material, after 300 DEG C of low temperature dryings, using universal micro-powder crusher crushing and processing and selection by winnowing goes out 100
Purpose granularity micro mist, addition 2wt% sodium chloride enter calcining furnace high-temperature calcination, and calcining furnace is using heating gas as fuel, calcination temperature
1150 DEG C, expanded perlite is made, through crushing and processing, selection by winnowing processing, sieving and grading, obtaining heap density is≤0.15g/ml expansion treasure
Pearl rock filter aid, is set as raw material B5。
Composite filter aid is produced:
Take raw material A5With raw material B5It uniformly mixes by the weight ratio of 1:1 to get low bulk density composite filter aid.This implementation
The product heap density that example is produced is 0.23g/ml, permeability and 800#High-quality super-cell is suitable.
Embodiment 6
Super-cell raw material is produced:
Selecting dioxide-containing silica for 80% middle-low grade diatomite is raw material, after 300 DEG C of low temperature dryings, using logical
Blocky diatomite is crushed to 200 mesh with type diatomite pulverizer, while going out the impurity such as fine sand, clay through two-stage selection by winnowing.Through
(diatomite is for middle-low grade diatomite material addition 5wt% sodium carbonate and 5wt% sodium chloride after dry broken and selection by winnowing
100%) it, is calcined 2 hours under the conditions of 1030 DEG C of temperature, cooled to room temperature.Crush, be classified heap density be 0.49g/
Ml super-cell, is set as raw material A6。
Pearlite filtering aid raw material is produced:
Select content for 80% or more, Al2O3Content 20%, Fe2O3Content is 1.0%, and expansion rate is white at 10-30 times
The high quality pearl rock of >=70 ° of degree is raw material, after 300 DEG C of low temperature dryings, utilizes universal micro-powder crusher crushing and processing and wind
The granularity micro mist greater than 100 mesh is selected, 2wt% sodium chloride is added, enters calcining furnace high-temperature calcination, calcining furnace is combustion with heating gas
1150 DEG C of calcination temperature, expanded perlite is made in material.Through crushing and processing, selection by winnowing processing, sieving and grading, obtain heap density be≤
0.15g/ml expanded perlite filter aid, is set as raw material B6。
Composite filter aid is produced:
Take raw material A6With raw material B6It uniformly mixes by the weight ratio of 1:1 to get low bulk density composite filter aid.This implementation
The product heap density that example is produced is 0.23g/ml, permeability and 800#High-quality super-cell is suitable.
1 composite filter aid heap density measurement of table
The filter aid and take middling speed expanded perlite filter aid by different proportion that 1 middle-low grade diatomite of Example is produced
Proportion measures its heap density, and acquired results are as shown in table 1.
The measurement of 2 composite filter aid size distribution of table
Choose the 300# super-cell and take middling speed (Z) expanded perlite that 1 middle-low grade diatomite of embodiment is produced
Filter aid is 1:1 proportion measurement composite filter aid size distribution situation by weight, as shown in table 2.
According to previous embodiment, invention is explained in detail, those skilled in the art should understand that: its
It is still possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is equal
Replacement；And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution
Spirit and scope.
Claims (8)
1. a kind of method of low-grade diatomite production low bulk density composite filter aid, which is characterized in that the method includes with
Lower step:
(1) SiO is selected2Middle-low grade diatomite of the content more than or equal to 70% is raw material, after low temperature drying, blocky diatom
Soil crushed 100-200 mesh, while be cleaned using light breeze selection by winnowing；The diatomite powder and granulated metal carbonic acid after selection by winnowing
After salt and granulated metal halide are sufficiently mixed uniformly, the high-temperature calcination under air environment obtains helping and melts firing product；By fluxing burning
Finished product is crushed, is classified, selection by winnowing goes out the micro mist of 150 mesh or more and is greater than 0.49g/ml super-cell to get to heap density
Product A；
(2) SiO is selected2Content is more than or equal to 70%, Al2O3Content is 10-20%, Fe2O3Content is less than or equal to 1.5%, expansion
Rate be 10-30 times, whiteness more than or equal to 70 ° high quality pearl rock be raw material, through low temperature drying, after crushing, be classified selection by winnowing go out 100
Granularity micro mist more than mesh；And it is sent into calcining furnace high-temperature calcination；Perlite powder natural cooling after high-temperature calcination expands, then
Crush, classification, selection by winnowing go out the micro mists of 100 mesh or more, heap density is made and is less than or equal to the production of 0.18g/ml expanded perlite filter aid
Product B；
(3) product A is uniformly mixed with product B according to different weight ratio, obtains the low heap with different permeabilities and heap density
Density filter aid product.
2. the method for low-grade diatomite production low bulk density composite filter aid according to claim 1, which is characterized in that
Step (1) the middle-low grade diatomite refers to that dioxide-containing silica is the diatomite of 65-85%.
3. the method for low-grade diatomite production low bulk density composite filter aid according to claim 1, which is characterized in that
Blocky diatomite smashes it through 150 meshes in the step (1), and low temperature drying temperature is 200-400 DEG C, and high-temperature calcination temperature is
900-1200℃。
4. the method for low-grade diatomite production low bulk density composite filter aid according to claim 1, which is characterized in that
Blocky diatomite smashes it through 200 meshes in the step (1).
5. the method for low-grade diatomite production low bulk density composite filter aid according to claim 1, which is characterized in that
Metal carbonate is by one or both of potassium carbonate, sodium carbonate, magnesium carbonate, calcium carbonate and composition described above in the step (1)；
Metal halide by one of magnesium fluoride, calcirm-fluoride, sodium fluoride, potassium fluoride, calcium chloride, magnesium chloride, sodium chloride, potassium chloride or
Two kinds and composition described above；The additive amount of the metal carbonate is the 1-10% of diatomite dry weight；The metal halide
Additive amount be diatomite dry weight 2-10%.
6. the method for low-grade diatomite production low bulk density composite filter aid according to claim 1, which is characterized in that
Metal carbonate is potassium carbonate or sodium carbonate in the step (1), and the metal halide is calcirm-fluoride, sodium chloride, chlorination
One of potassium or two kinds and composition described above.
7. the method for low-grade diatomite production low bulk density composite filter aid according to claim 1, which is characterized in that
Low temperature drying temperature is 250-350 DEG C in the step (2), and high-temperature calcination temperature is 1000-1300 DEG C, and coal gas is used when calcining
Or natural gas is as fuel.
8. the method for low-grade diatomite production low bulk density composite filter aid according to claim 1, which is characterized in that
Different industrial uses are adapted to by adding halide flux to change perlite intensity before pearlstone calcining in the step (2)
The intensity requirement of middle product, the halide flux by one of calcirm-fluoride, sodium fluoride, sodium chloride, potassium chloride, magnesium chloride or
Two kinds of person and composition described above, the halide flux additive amount are the 1-5% of perlite dry weight.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111686513A (en) * | 2020-05-26 | 2020-09-22 | 合肥万丰油脂有限公司 | Preparation process of filter aid for oil processing |
| CN112552427A (en) * | 2020-07-01 | 2021-03-26 | 吉林省石油化工设计研究院 | Molecular-level production process and device of inulin |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111686513A (en) * | 2020-05-26 | 2020-09-22 | 合肥万丰油脂有限公司 | Preparation process of filter aid for oil processing |
| CN112552427A (en) * | 2020-07-01 | 2021-03-26 | 吉林省石油化工设计研究院 | Molecular-level production process and device of inulin |
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Application publication date: 20190412 |
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