CN107089837A - A kind of method that porous ceramics is prepared with paper white sludge discarded object - Google Patents
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Abstract
The present invention relates to a kind of method that porous ceramics is prepared with paper white sludge discarded object, 60 80 parts of paper white sludge discarded objects, 20 40 parts of flying dusts, 10 20 parts of sodium acid carbonates, 0.01 0.03 parts of additives, 35 parts of water are well mixed, add 15 parts of foaming agent stirring foaming, drying, the low-temperature sintering 6 10 hours under conditions of not higher than 850 DEG C；Described additive is by potassium silicate, carboxymethyl cellulose, sodium humate, tannic acid sodium in mass ratio 15~20：35~45：10~15：20~30 mix.The inventive method realizes the manufacturing cost of the utilization of discarded object, reduction carrying capacity of environment and porous ceramics；Obtained porous ceramics has preferable rupture strength, and thermal insulation is good, density is small, from heavy and light.
Description
Technical field
The present invention relates to a kind of method that porous ceramics is prepared with paper white sludge discarded object, belong to construction material and discarded object
Utilize technical field.
Background technology
According to the data of Chinese papermaking association, ended for the end of the year 2012, China's paper and paperboard production and consumption figure continuous three
Year exceedes the U.S., ranks first in the world, reaches 99,300,000 tons, papermaking yield and consumption figure account for the 23.3% of world's total amount respectively
With 23.1%.
Shandong Province is the big province of papermaking, and 2012 annual productions are 17,100,000 tons, accounts for the 17% of national total output, occupies within continuous 18 years complete
First, state.Our province paper industry water pollution problems while papermaking enterprise is greatly developed is improved, but white clay
Pollute the important environment bottleneck by influence papermaking enterprise development is increasingly becoming.In October, 2013, Shandong Province is called together in the environmental protection Room in Weifang
Open paper white sludge to administer and comprehensive utilization on-the-spot meeting, it is indicated that due to the limitation of processing cost and technology, our province removes Some Enterprises pair
White clay has been carried out outside recycling, and most enterprises are to fill or stack with selecting.This not only wastes substantial amounts of limestone resource,
The soil and groundwater resources to surrounding cause serious secondary pollution simultaneously.Due to shortage of land resource, landfill disposal also day
Beneficial difficult, the outdoor white clay stored up can also form dust pollution source, air quality is impacted.It is required that strengthen white clay administer and
Supervision, improves resource utilization, reduces and even prevents lime mud discharge, it is ensured that Environmental security.
By existing process, often produce 1t paper pulp and about produce 1t white clays, and with the newly-built alkali of China's enterprises in pulp and paper industry
Recovery system increasing number, popularization, the white clay of generation proportional will be increased considerably and accumulated.
Pulping and paper-making white clay (hereinafter referred to as white clay) is the muddy precipitation by-product produced by paper industry causticization process
Thing, its main chemical reactions formula is as follows：
Na2CO3+Ca(OH)2→CaCO3↓+2NaOH
Emulsion after causticization is clarified, isolates sodium hydroxide solution (white liquor) storage, is recycled for pulping and digesting；It is heavy
The white clay in shallow lake reclaims sodium hydroxide therein, finally gives the high waste residue of moisture content through further washing and filtering.White clay it is main
Mineralogical composition is the bad CaCO of granular crystal3, its particle diameter is 15-25 μm, is that a kind of thin solid of loose porous, particle gives up
Material.The moisture content of general paper white sludge is in 40-50%, residual fraction paper-making fibre and partial organic substances.
At present, most enterprises handle paper white sludge using landfill or by the way of stacking, landfill disposal is although simple and easy to do,
Small investment, but substantial amounts of land resource need to be taken, and due to compacting, rainfall and microorganism decomposition during the landfill of sludge
The reason for, the dissolving of high concentration percolate and residual alkali can be produced, underground water pollution is caused, meanwhile, large-scale white clay stockyard is being disliked
Also exist under the conditions of bad weather etc. and be squashed risk, the hidden danger as social danger.Therefore, this extensive lime mud treatment mode is not
Only bring the hidden danger of environmental pollution, the wasting of resources and social danger, with soil and management service cost rising and
Constantly harsh environmental requirement, has become one of key factor of restriction Sustainable Development of Enterprises, seeks the recycling of white clay
Recycling approach is the inevitable choice of papermaking enterprise and the whole society.
The content of the invention
The purpose of the present invention is that the waste material existed for existing paper industry wastes, pollutes environment and porous ceramics demand
Greatly, the problem of cost is high realizes energy-saving and emission-reduction there is provided a kind of method that porous ceramics is prepared with paper white sludge discarded object, gives up
Thing is utilized.
To achieve the above object, the present invention uses following technical scheme：
Porous ceramics prepared by a kind of use paper white sludge discarded object, by 60-80 by weight parts of water content 30% ± 5%
Paper white sludge discarded object, 20-40 parts of flying dusts, 10-20 parts of sodium acid carbonates, 0.01-0.03 parts of additives, 3-5 parts of water mixing it is equal
It is even, 1-5 parts of foaming agent foams are added, are then dried, low-temperature sintering is formed under conditions of not higher than 850 DEG C；Described is additional
Agent is by potassium silicate, carboxymethyl cellulose, sodium humate, tannic acid sodium in mass ratio 15~20：35~45：10~15：20~30
Mix.
A kind of method that porous ceramics is prepared with paper white sludge discarded object, by 60-80 parts of paper white sludge discarded objects, 20-40
Part flying dust, 10-20 parts of sodium acid carbonates, 0.01-0.03 parts of additives, 3-5 parts of water are well mixed, and add 1-5 parts of foaming agents stirrings
Foaming, drying, low-temperature sintering 6-10 hours under conditions of not higher than 850 DEG C；Described additive is fine by potassium silicate, carboxymethyl
Tie up element, sodium humate, tannic acid sodium in mass ratio 15~20：35~45：10~15：20~30 mix.
Described method, preferably includes step as follows：
(1) paper white sludge is taken out into sieving, press filtration, its discarded object water content is maintained at 30% ± 5%；
(2) by 60-80 parts of paper white sludge discarded objects, 20-40 parts of flying dusts, 10-20 parts of sodium acid carbonates, 0.01-0.03 especially
Plus agent, 3-5 parts of water are well mixed, 1-5 parts of foaming agent stirring foaming are added, described additive is by potassium silicate, carboxymethyl cellulose
Element, sodium humate, tannic acid sodium in mass ratio 15~20：35~45：10~15：20~30 mix；
(3) dry；
(4) low-temperature sintering 6-10 hours under conditions of not higher than 850 DEG C.
In the above method, paper white sludge water content used is 20-25wt%, calcium content is in 60-70wt%, residual papermaking
Fiber is 5-10wt%, and granularity is 10-100 microns, and described sieving sieve mesh is about 100-800 mesh.
Described flying dust, its percentage by weight composition is following (butt)：Al2O338.5%-40.3%%, SiO2
33.5%-35.9%, CaO 10.1%-12.3%, impurities balance, impurity is other oxides.
Described foaming is natural foaming, and the compound foamed is more than or equal to 50% ring in 20 ± 2 DEG C of humidity of temperature
Conserved 8-10 hours in border.So that the distribution of moisture content tends to homogenization in compound, while also having driven bonding inside compound
Homogenization of the materials such as agent inside compound.The preferred hydrogen peroxide of described foaming agent.
Described drying is to be dried 3-5 hours in 90 ± 5 DEG C of drying plant.
In order to ensure the formation of porous ceramics pore structure and ceramic mullite phase, the too high structure collapses of temperature are prevented, are taken
The sintering process of low temperature long-time heat preservation, it is preferred to use 3 DEG C of heating per minute, 300 DEG C are incubated 30-40 minutes, 600 DEG C of insulations
60-80 minutes, the sintering process of 850 DEG C of insulations 3 hours.
Above-mentioned additive is preferably by potassium silicate, carboxymethyl cellulose, sodium humate, tannic acid sodium in mass ratio 20：40：
15：25 mix.
Porous ceramic film material made from the above method.
The beneficial effects of the invention are as follows：
(1) Al in the CaO in paper white sludge, flying dust is made full use of2O3And SiO2, form the mullite phase of ceramics；Papermaking
Decomposition of Calcium Carbonate in white clay produces substantial amounts of gas and forms porous structure；Dioxygen water foaming agent can introduce a large amount of stomatas,
The temperature of the appearance liquid phase of porous ceramics can be greatly reduced in the use of sodium acid carbonate fluxing agent, utilize easy fired；
(2) use of additive, can effectively discharge the absorption water inside paper white sludge and change into Free water, reduction
The consumption of external adding water, has saved cost；The space left by water discharged, the closed space of formation is also mitigated simultaneously
The deadweight of product；
(3) sintering process used can ensure the formation of porous ceramics pore structure and ceramic mullite phase, prevent temperature mistake
High structure collapses；
(4) present invention utilizes the manufacturing cost of a large amount of industrial refuses, reduction carrying capacity of environment and porous ceramics；
(5) porous ceramics made from the inventive method has preferable rupture strength, thermal insulation good, and density is small, from heavy and light.
Embodiment
With reference to specific embodiment, the present invention is further described.
The paper white sludge water content of the embodiment of the present invention is 20-25wt%, calcium content in 60-70wt%, residual papermaking
Fiber is 5-10wt%, and granularity is 10-100 microns.Flying dust its percentage by weight composition is following (butt)：Al2O3
38.5%-40.3%%, SiO233.5%-35.9%, CaO 10.1%-12.3%, impurities balance, impurity is other oxidations
Thing.
Embodiment 1
(1) paper white sludge is taken out into sieving, press filtration, press filtration makes its discarded object water content be maintained at 30% ± 5% (wt%)；
(2) dispensing：By 60 parts of paper white sludge discarded objects, 40 parts of flying dusts, 20 parts, 0.01 part additive of sodium acid carbonate and 5 parts
Water is well mixed, and slurry is made, and adds 2 parts of foaming agent stirrings, and natural foaming, the compound foamed is wet in 20 ± 2 DEG C of temperature
Degree is placed 8 hours in the environment more than or equal to 50%；Additive is by potassium silicate, carboxymethyl cellulose, sodium humate, tannic acid sodium
In mass ratio 20：40：15：25 mix；
(3) dry：The sample foamed is placed in 90 DEG C or so of drying plant and dried 5 hours；
(4) sinter：In order to ensure the formation of porous ceramics pore structure and ceramic mullite phase, prevent the too high structure of temperature from collapsing
Collapse, take the sintering process of low temperature long-time heat preservation, i.e., using 3 DEG C of heating per minute, 300 DEG C are incubated 40 minutes, 600 DEG C of insulations
60 minutes, the sintering process of 850 DEG C of insulations 3 hours.
Embodiment 2
(1) paper white sludge is taken out into sieving, press filtration, press filtration makes its discarded object water content be maintained at 30% ± 5%；
(2) dispensing：By 70 parts of paper white sludge discarded objects, 30 parts of flying dusts, 15 parts, 0.02 part additive of sodium acid carbonate and 4 parts
Water is well mixed, and slurry is made, and adds 3 parts of foaming agent stirrings, and natural foaming, the compound foamed is wet in 20 ± 2 DEG C of temperature
Degree is placed 9 hours in the environment more than or equal to 50%；Additive is by potassium silicate, carboxymethyl cellulose, sodium humate, tannic acid sodium
In mass ratio 20：40：15：25 mix；
(3) dry：The sample foamed is placed in 90 DEG C or so of drying plant and dried 4 hours；
(4) sinter：In order to ensure the formation of porous ceramics pore structure and ceramic mullite phase, prevent the too high structure of temperature from collapsing
Collapse, take the sintering process of low temperature long-time heat preservation, i.e., using 3 DEG C of heating per minute, 300 DEG C are incubated 30 minutes, 600 DEG C of insulations
80 minutes, the sintering process of 850 DEG C of insulations 3 hours.
Embodiment 3
(1) paper white sludge is taken out into sieving, press filtration, press filtration makes its discarded object water content be maintained at 30% ± 5%；
(2) dispensing：By 80 parts of paper white sludge discarded objects, 20 parts of flying dusts, sodium acid carbonate 10 parts, 0.03 part additive, 3 parts of water
Proportionally be well mixed, be made slurry, add 4 parts of foaming agents stirrings, natural foaming, the compound foamed temperature 20 ±
2 DEG C of humidity, which are more than or equal in 50% environment, places 10 hours；Additive is by potassium silicate, carboxymethyl cellulose, sodium humate, list
Peaceful acid sodium in mass ratio 20：40：15：25 mix；
(3) dry：The sample foamed is placed in 90 DEG C or so of drying plant and dried 3 hours；
(4) sinter：In order to ensure the formation of porous ceramics pore structure and ceramic mullite phase, prevent the too high structure of temperature from collapsing
Collapse, take the sintering process of low temperature long-time heat preservation, i.e., using 3 DEG C of heating per minute, 300 DEG C are incubated 40 minutes, 600 DEG C of insulations
70 minutes, the sintering process of 850 DEG C of insulations 3 hours.
Embodiment 4
(1) paper white sludge is taken out into sieving, press filtration, press filtration makes its discarded object water content be maintained at 30% ± 5%；
(2) dispensing：By 70 parts of paper white sludge discarded objects, 30 parts of flying dusts, 15 parts, 0.02 part additive of sodium acid carbonate and 4 parts
Water is well mixed, and slurry is made, and adds 3 parts of foaming agent stirrings, and natural foaming, the compound foamed is wet in 20 ± 2 DEG C of temperature
Degree is placed 9 hours in the environment more than or equal to 50%；Additive is by potassium silicate, carboxymethyl cellulose, sodium humate, tannic acid sodium
In mass ratio 20：35：10：20 mix；
(3) dry：The sample foamed is placed in 90 DEG C or so of drying plant and dried 4 hours；
(4) sinter：In order to ensure the formation of porous ceramics pore structure and ceramic mullite phase, prevent the too high structure of temperature from collapsing
Collapse, take the sintering process of low temperature long-time heat preservation, i.e., using 3 DEG C of heating per minute, 300 DEG C are incubated 30 minutes, 600 DEG C of insulations
80 minutes, the sintering process of 850 DEG C of insulations 3 hours.
The performance data such as table 1 of product made from each embodiment is measured under the same conditions.
The experimental data statistical form of table 1
Above is the present invention is discussed in detail in conjunction with specific embodiments, protection scope of the present invention not limited to this.
Claims (10)
1. porous ceramics prepared by a kind of use paper white sludge discarded object, it is characterized in that, by 60-80 by weight parts of water content
30% ± 5% paper white sludge discarded object, 20-40 parts of flying dusts, 10-20 parts of sodium acid carbonates, 0.01-0.03 parts of additives, 3-5 parts
Water is well mixed, and is added 1-5 parts of foaming agent foams, is then dried, low-temperature sintering is formed under conditions of not higher than 850 DEG C；Institute
The additive stated is by potassium silicate, carboxymethyl cellulose, sodium humate, tannic acid sodium in mass ratio 15~20：35~45：10~
15：20~30 mix.
2. porous ceramics prepared by a kind of use paper white sludge discarded object according to claim 1, it is characterized in that, described is low
Temperature sintering is using 3 DEG C of heating per minute, and 300 DEG C are incubated 30-40 minutes, and 600 DEG C are incubated 60-80 minutes, and 850 DEG C are incubated 3 hours
Sintering process.
3. a kind of method that porous ceramics is prepared with paper white sludge discarded object, it is characterized in that, 60-80 parts of paper white sludges are discarded
Thing, 20-40 part flying dust, 10-20 parts of sodium acid carbonates, 0.01-0.03 parts of additives, 3-5 parts of water are well mixed, and add 1-5 parts of hairs
Infusion stirring foaming, drying, low-temperature sintering 6-10 hours under conditions of not higher than 850 DEG C；Described additive by potassium silicate,
Carboxymethyl cellulose, sodium humate, tannic acid sodium in mass ratio 15~20：35~45：10~15：20~30 mix.
4. a kind of method that porous ceramics is prepared with paper white sludge discarded object according to claim 3, it is characterized in that, including
Step is as follows：
(1) paper white sludge is taken out into sieving, press filtration, its discarded object water content is maintained at 30% ± 5%；
(2) by 60-80 parts of paper white sludge discarded objects, 20-40 parts of flying dusts, 10-20 parts of sodium acid carbonates, 0.01-0.03 parts of additives,
3-5 parts of water are well mixed, and add 1-5 parts of foaming agent stirring foaming, described additive is by potassium silicate, carboxymethyl cellulose, corruption
Grow sour sodium, tannic acid sodium in mass ratio 15~20：35~45：10~15：20~30 mix；
(3) dry；
(4) low-temperature sintering 6-10 hours under conditions of not higher than 850 DEG C.
5. a kind of method that porous ceramics is prepared with paper white sludge discarded object according to claim 3 or 4, it is characterized in that,
Described low-temperature sintering is using 3 DEG C of heating per minute, and 300 DEG C are incubated 30-40 minutes, and 600 DEG C are incubated 60-80 minutes, 850 DEG C of guarantors
The temperature sintering process of 3 hours.
6. a kind of method that porous ceramics is prepared with paper white sludge discarded object according to claim 4, it is characterized in that, it is used
Paper white sludge water content be 20-25wt%, calcium content 60-70wt%, residual paper-making fibre be 5-10wt%, granularity is
10-100 microns.
7. a kind of method that porous ceramics is prepared with paper white sludge discarded object according to claim 3 or 4, it is characterized in that,
Described flying dust, its percentage by weight composition is as follows：Al2O338.5%-40.3%%, SiO233.5%-35.9%, CaO
10.1%-12.3%, impurities balance, impurity is other oxides.
8. a kind of method that porous ceramics is prepared with paper white sludge discarded object according to claim 3 or 4, it is characterized in that,
Described foaming is the lower natural foaming of stirring, and compound foam is in 20 ± 2 DEG C of temperature, environment of the humidity more than or equal to 50%
Middle placement 8-10 hours.
9. a kind of method that porous ceramics is prepared with paper white sludge discarded object according to claim 3 or 4, it is characterized in that,
Described additive is by potassium silicate, carboxymethyl cellulose, sodium humate, tannic acid sodium in mass ratio 20：40：15：25 mixing and
Into.
10. porous ceramic film material made from the method described in claim any one of 3-9.
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| CN117164332A (en) * | 2023-08-29 | 2023-12-05 | 地大(武汉)资产经营有限公司 | Method for modifying ceramic pug by biomass-based binder |
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Application publication date: 20170825 |