CN108192623A - Bayer process red mud roadbed microorganism curing and application process - Google Patents
Bayer process red mud roadbed microorganism curing and application process Download PDFInfo
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- CN108192623A CN108192623A CN201810024719.7A CN201810024719A CN108192623A CN 108192623 A CN108192623 A CN 108192623A CN 201810024719 A CN201810024719 A CN 201810024719A CN 108192623 A CN108192623 A CN 108192623A
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- red mud
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K17/00—Soil-conditioning materials or soil-stabilising materials
- C09K17/14—Soil-conditioning materials or soil-stabilising materials containing organic compounds only
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/04—Foundations produced by soil stabilisation
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/12—Consolidating by placing solidifying or pore-filling substances in the soil
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2103/00—Civil engineering use
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- General Engineering & Computer Science (AREA)
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- Agronomy & Crop Science (AREA)
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- Treatment Of Sludge (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
The invention discloses a kind of processing methods and application process of Bayer process red mud roadbed, belong to field of road.The Bayer process red mud roadbed of laying is sufficiently mixed by this method by a certain percentage in a manner that machinery is turned over the microbial inoculum comprising Bacillus pasteurii, then provides it nutrient solution and consolidating fluid using the method for more wheel slip castings.The present invention is originally fully mixed Bacillus pasteurii, red mud, consolidating fluid three by the way of " machinery turns over+slip casting ", the cementing filling red mud particle of calcium carbonate crystal is generated in red mud hole using Bacillus pasteurii, realizes the curing to red mud.Red mud after curing can be used for roadbed filling engineering, have the characteristics of non-secondary pollution, of low cost, preparation method is simple and resource utilization is high.In addition, the method for the present invention can also fix the harmful components such as the heavy metal in red mud, it can be achieved that red mud by all kinds of means, extensive recycling.
Description
Technical field
The present invention relates to the microorganism curings and application process of a kind of Bayer process red mud roadbed, belong to road engineering neck
Domain.
Background technology
Red mud is bauxite through various physics and chemical treatment, produces remaining red powder pureed High water cut after aluminium oxide
The strong basicity solid waste of amount.Its quantum of output is different due to the grade of ore, production method, technical merit.In general, often produce 1
Ton aluminium oxide while 0.8~1.5 ton of red mud of output.China's red mud adds up volume of cargo in storage more than 3.5 hundred million tons at present, a large amount of heaps of red mud
It deposits, both land occupation, waste of resource, and easily causes environmental pollution and security risk.According to statistics, ended for the end of the year 2016, red mud
Annual emissions more than 80,000,000 tons, add up volume of cargo in storage more than 3.52 hundred million tons, and utilization is ten thousand tons about more than 300, utilization rate is not
Foot 4%.Therefore, red mud pilling and harm are reduced to greatest extent, realize by all kinds of means, large-scale recycling compeled in eyebrow
Eyelash.
Microorganism soil-fixing technology is a kind of ecology, environmentally friendly solid indigenous method.The solid soil of microorganism slip casting mainly passes through alternating
Inject microbial inoculum and consolidating fluid, using microorganism induction calcium carbonate crystal technology (MICP technologies), the hole between soil particle
Middle precipitation calcium carbonate crystal, it is cementing with filling soil particle and then playing the role of soil mass consolidation.At present mainly using micro- in engineering
Biological slip casting curing sand and silt.
Red mud belongs to solid waste, and particle is tiny, pore throat size is small；Mainly contain alkali, ferriferous oxide；PH for 10.5~
12.0；Rich in the poisonous and harmful substances such as fluorine ion and As, Cr, Hg, with alkalinity is higher, liquid limit is higher, intensity and modulus are low
The features such as (water disintegration is without intensity).Poor (the leaching of the intensity of red mud mixture low (less than 0.5MPa), water stability under natural conditions
Water is disintegrated completely within 10 minutes), it is impossible to meet the basic demand that engineering uses.From current highway design, check and accept etc. specifications or
From the point of view of standard requirement, the indexs such as the unconfined compressive strength value of original red mud, the modulus of resilience, California bearing ratio (CBR) cannot
Meet related request.Therefore, red mud cannot be used directly as roadbed embankment material for highway and town road roadbed.
The technical solution of the prior art one
(Nan Xiangli, Zhang Tingan, Liu Yan etc.《China's red mud comprehensive utilization analysis》, process engineering journal)：It will be in red mud
After moisture removal, with dried powder state air storage, such method is known as dry method stockpiling.
The shortcomings that prior art one
Red mud pilling means that the soil of a large amount of preciousnesses has to be used to store these wastes.At the same time, in red mud
Sodium hydroxide containing a large amount of strong corrosives, can also contain toxic heavy metal sometimes, these harmful substances once penetrate into soil
Or river, very serious pollution will be caused.If storing up the place of red mud since nature or artificial origin are revealed, make
Into harm will be more serious.
The technical solution of the prior art two
(Nan Xiangli, Zhang Tingan, Liu Yan etc.《China's red mud comprehensive utilization analysis》, process engineering journal)：Using chemistry or
Useful constituent in metallurgical method extraction red mud, (for extracting scandium oxide, step is to use salt acidleach first to recycling valuable metal
Red mud then with P204+ sec-octyl alcohols+kerosene extracting scandium from pickle liquor, after hydrochloric acid back extraction removal of impurities, is stripped with sodium hydroxide solution
It takes, obtains hydroxide precipitation again with dissolving with hydrochloric acid, have TBP+ sec-octyl alcohols+kerosene extraction scandium, after water is stripped, add tartaric acid+ammonia
Water is precipitated, and sediment calcination is obtained titanium dioxide scandium product).
The shortcomings that prior art two
Chemistry or metallurgical method investment is big, high energy consumption, it is of high cost, suitable for the very high raw material of processing grade.And China's red mud
Iron-holder is relatively low, recycle low production efficiency, this high investment, low output production method be uneconomic.
The technical solution of the prior art three
(Zhu Jun, orchid build the synthetical recovery of triumphant red muds and the protection of utilization [J] mineral products and utilization)：It is used as life as raw material
Produce the construction materials such as brick and tile, cement and ceramics.Cement slurry is incorporated by ferriferous raw material of red mud, clinker can utilize red mud 5
~20kg/t.
The shortcomings that prior art three
A large amount of greenhouse gases can be given off in production process, and such red mud processing method production cost is higher, obtains
Product performance it is also not fully satisfactory, hardly result in large-scale popularization and application.
Invention content
Technical problem：Existing red mud treatment technology, stored up using dry method, chemistry or metallurgical method, as iron cement raw material side
Based on method, these method environmental pollutions are serious, input is high, production efficiency Low investment is big, high energy consumption, of high cost, can not have at all
The technical problems such as commercial Application are imitated, it is difficult to accomplish to handle red mud on a large scale, compared to annual several ten million tons of red mud
The effect of accumulative speed it is little.For the present invention using energy-saving and environmental protection, free of contamination microbial technique, processing is carried out to red mud makes it
Reach the requirement that ground in civil engineering uses, extensive, the industrialization for red mud, which are administered, provides new method.
Technical solution
The principle of the present invention is：Poor (the immersion 10 minutes of untreated red mud intensity low (less than 0.5MPa), water stability
Within be disintegrated completely), there is alkalinity and (alkalinity is embodied in the pH value of red mud generally 10.5~12 for more harmful substances；It is mostly harmful
Substance is rich in the poisonous and hazardous heavy metal element such as fluorine ion and As, Cr, Hg) the characteristics of.Therefore it cannot meet work
The basic demand that journey uses can just be applied after only being handled.Microorganism induction calcium carbonate crystal technology (MICP skills
Art), generation calcium carbonate crystal can be deposited in the hole between soil particle, these crystalline solid have the cementing work with filling soil particle
With the mechanical characteristic and stability of red mud can be significantly improved.And the Bacillus pasteurii selected by this technology belongs to basophilla
Microorganism, alkaline environment do not interfere with its normal work not only, may also contribute to cementing and filling effect calcium carbonate crystal
Formation.And Bacillus pasteurii not only has heavy metal element stronger resistant function, but also the calcium carbonate of its generation sinks
Shallow lake can also play the role of fixed toxic heavy metal.For the characteristics of red mud particle is tiny, pore throat size is small, this technology selection profit
With the method for " machinery turns over+slip casting ", first using the method that Bacillus pasteurii bacterium solution is sprayed when turning over, by microbial bacteria
Liquid and red mud are sufficiently mixed, and then grouting method are used to provide nutrient solution and glue for the Bacillus pasteurii being distributed in red mud again
Liquid is tied, achievees the purpose that generate calcium carbonate crystal Reinforcing Red Mud.
Bayer process red mud roadbed microbial treatment method, it is characterised in that this method step is as follows：
A. red mud layer thickness is uniformly laid in 20cm~40cm or so；
B. red mud is handled, while spray red mud pore volume to be consolidated using the methods of cultivation (including rotary tillage, turning over)
1.5 times of a concentration of OD600=1.2 microbial inoculum 3 is 2.；
C. a, b operation are repeated, is laid with multilayer red mud layer, until reaching 6 thickness of red mud layer of design；
D. after treating that red mud layer is laid with, grouting tube 1 is vertically squeezed into red mud 6；
E. by grouting tube 1, the nutrient solution 3 of 1.5 times of red mud pore volume to be consolidated is injected into red mud 7 to be consolidated first
1. reinject the urea and CaCl of a concentration of 0.5mol/L~1.0mol/L isometric with microbial inoculum2It mixes
Consolidating fluid 4 stands 12h；
F. c operations are repeated, (nutrient solution 3 is 1. or cementing until the intensity of red mud 7 to be consolidated reaches requirement or slip casting liquid
Liquid 4) it can not inject when in solid red mud 7, stop slip casting.
The Bayer process red mud roadbed microbial treatment method, it is characterised in that use in step b and sprayed when turning over
Red mud roadbed and the bacterium solution comprising Bacillus pasteurii are sufficiently mixed by the mode of bacterium solution by a certain percentage.
The Bayer process red mud roadbed microbial treatment method, it is characterised in that using the side of more wheel slip castings in step e
Formula provides nutrient solution and consolidating fluid for red mud roadbed.
The Bayer process red mud roadbed microbial treatment method, it is characterised in that the red mud after curing can be used for highway road
Base reclamation work.
The Bayer process red mud roadbed microbial treatment method, it is characterised in that processing procedure is in room temperature, condition of normal pressure
Lower progress；The temperature is preferably 15~45 DEG C.
The Bayer process red mud roadbed microbial treatment method, it is characterised in that microorganism used therefor is Bacillus pasteurii
(S.pasteurii)。
Beneficial effects of the present invention：
(1) method turned over while spray bacterium solution can be such that bacterium solution is sufficiently mixed with red mud, improve the uniform of red mud reinforcing
Property and effect.
(2) more wheel slip castings to red mud can be realized using grouting method to nutrient solution and consolidating fluid, after curing microorganism
Red mud reach very high intensity.
(3) performances such as its mechanical characteristic of the red mud after microorganism cures, water stability are all significantly improved, Ke Yiman
The requirement that sufficient engineering uses.Research shows that after microbiological treatment, 7 days non-compressive strength after immersion of red mud are promoted to
1.5MPa, compressive strength after immersion is promoted to 1.5MPa within 7 days.
(4) through the cured red mud of microorganism, harmful substance therein, metal ion are fixed, and are avoided to underground water, rain
The pollution of the environment such as water.And the pH value of red mud is significantly reduced, research shows that, after microbiological treatment, red mud test specimen
PH value is reduced to 8.1 or so.
(5) entire red mud processing procedure carries out under room temperature, condition of normal pressure；Compared with traditional processing method, there is energy
Consumption less, pollution-free, noresidue, it is environmental-friendly, have the advantages such as good biocompatibility.
Description of the drawings
Fig. 1 slip casting schematic diagrames
Reference numeral：1- grouting tubes, 2- grouting pumps, 3 1.-nutrient solution, 3 2.-bacterium solution, 4- consolidating fluids, 5- valves, 6- are red
Muddy ground base, 7- red muds to be consolidated
Specific embodiment
Red mud source is Shandong Wei Qiao groups；Experiment is that Bayer process is made with red mud, main component Al2O3、Fe2O3.Wherein,
PH value is 11.5~12.0, and red mud basic physical property is as shown in table 1 below：
Table 1
Embodiment 1
In this example, Bayer process red mud roadbed microorganism curing and application process are used to handle red mud roadbed, the party
Method includes the following steps：
It constructs, is laid with thick using red mud 6 as roadbed embankment material (such as roadbed, base and underlayment filling material)
Degree is about the red mud soil layer of 30cm；After laying, machinery is carried out to pending red mud soil layer and is turned over；It turns on one side, on one side
Spray OD600=1.2 Bacillus pasteurii bacterium solution；It is so repeated as many times, treats that the thickness of red mud ground 6 reaches 1.5m；
A. grouting tube 1 is vertically squeezed into red mud ground 6；
B. by grouting tube 1, the nutrient solution 3 of 1.5 times of soil body pore volume to be consolidated is injected into red mud 7 to be consolidated first
1. it reinjects and the nutrient solution 3 1. isometric urea of a concentration of 1.0mol/L and the CaCl of 1.0mol/L2The glue mixed
Liquid 4 is tied, stands 12h；
C. b operations are repeated, until when solid 7 intensity of red mud reaches requirement, stop slip casting.
Using and effect：The rear unconfined compressive strength of 7 days is 1.2MPa, and the pH value of red mud test specimen is reduced to 9.3.
Embodiment 2
In this example, Bayer process red mud roadbed microorganism curing and application process are used to handle red mud roadbed, the party
Method includes the following steps：
It constructs, is laid with thick using red mud 6 as roadbed embankment material (such as roadbed, base and underlayment filling material)
Degree is about the red mud soil layer of 50cm；After laying, machinery is carried out to pending red mud soil layer and is turned over；It turns on one side, on one side
Spray OD600=1.2 Bacillus pasteurii bacterium solution；It is so repeated as many times, treats that the thickness of red mud ground 6 reaches 3m；
A. grouting tube 1 is vertically squeezed into red mud ground 6；
B. by grouting tube 1, the OD of 1.5 times of soil body pore volume to be consolidated is injected into red mud 7 to be consolidated first600=1.2
Bacillus pasteurii bacterium solution 3 2., reinject and bacterium solution 3 2. the urine rope of isometric a concentration of 1.0mol/L and 1.0mol/L
CaCl2The consolidating fluid 4 mixed stands 12h；
C. b operations are repeated, until when solid 7 intensity of red mud reaches requirement, stop slip casting.
Using and effect：The rear unconfined compressive strength of 7 days is 1.5MPa, and the pH value of red mud test specimen is reduced to 8.6.
Claims (6)
1. Bayer process red mud roadbed microorganism curing, it is characterised in that bacterium solution used is Bacillus pasteurii
(S.pasteurii)。
2. Bayer process red mud roadbed microbial treatment method, it is characterised in that this method step is as follows：
A. red mud layer thickness is uniformly laid in 20cm~40cm or so；
B. red mud is handled using the methods of cultivation (including rotary tillage, turning over), while sprays 1.5 times of red mud pore volume to be consolidated
A concentration of OD600=1.2 microbial inoculum；
C. a, b operation are repeated, is laid with multilayer red mud layer, until reaching 6 thickness of red mud layer of design；
D. after treating that red mud layer is laid with, grouting tube 1 is vertically squeezed into red mud 6；
E. by grouting tube 1, the nutrient solution 3 of 1.5 times of red mud pore volume to be consolidated is injected into red mud 7 to be consolidated first 1., then
The urea and CaCl of the injection a concentration of 0.5mol/L~1.0mol/L isometric with microbial inoculum2The consolidating fluid mixed
4, stand 12h；
F. e operations are repeated, until the intensity of red mud 7 to be consolidated reaches requirement or slip casting liquid (nutrient solution 3 1. or consolidating fluid 4)
It can not inject when in solid red mud 7, stop slip casting.
3. Bayer process red mud roadbed microbial treatment method, it is characterised in that using the side that bacterium solution is sprayed when turning in step b
Red mud roadbed and the bacterium solution comprising Bacillus pasteurii are sufficiently mixed by formula by a certain percentage.
4. Bayer process red mud roadbed microbial treatment method, it is characterised in that the mode of more wheel slip castings is used in step e as red mud
Roadbed provides nutrient solution and consolidating fluid.
5. Bayer process red mud roadbed microbial treatment method, it is characterised in that the red mud after curing can be used for roadbed filling work
Journey.
6. Bayer process red mud roadbed microbial treatment method, it is characterised in that processing procedure carries out under room temperature, condition of normal pressure；Institute
The temperature stated is preferably 15~45 DEG C.
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Cited By (5)
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| CN110130318A (en) * | 2019-05-24 | 2019-08-16 | 南京林业大学 | A kind of construction method of microorganism mixing-filling stake |
| WO2020155523A1 (en) * | 2019-02-01 | 2020-08-06 | 中国矿业大学 | Method for solidifying heavy metal of coal gangue by using microorganism |
| CN111672900A (en) * | 2020-06-01 | 2020-09-18 | 合肥工业大学 | Method for restoring heavy metal pollution of soil by microorganism-induced calcium carbonate precipitation |
| CN111999156A (en) * | 2020-07-29 | 2020-11-27 | 东南大学 | Temperature-controlled high-pressure biological solidification test device and test method thereof |
| CN114149244A (en) * | 2021-12-10 | 2022-03-08 | 临沂海螺新材料科技有限公司 | Method for preparing red mud building material product based on composite microbial technology |
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| CN107100162A (en) * | 2017-05-19 | 2017-08-29 | 南京林业大学 | A kind of solid indigenous method of microorganism gas-liquid cycle slip casting |
| CN107487997A (en) * | 2017-08-21 | 2017-12-19 | 南京林业大学 | A kind of processing method of red mud |
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| CN101301657A (en) * | 2008-06-13 | 2008-11-12 | 天津市瑞丰原生物修复技术有限公司 | Microorganism product for repairing soil polluted by petroleum and products produced thereby and repair method |
| CN107100162A (en) * | 2017-05-19 | 2017-08-29 | 南京林业大学 | A kind of solid indigenous method of microorganism gas-liquid cycle slip casting |
| CN107487997A (en) * | 2017-08-21 | 2017-12-19 | 南京林业大学 | A kind of processing method of red mud |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020155523A1 (en) * | 2019-02-01 | 2020-08-06 | 中国矿业大学 | Method for solidifying heavy metal of coal gangue by using microorganism |
| AU2019427413B2 (en) * | 2019-02-01 | 2023-08-17 | China Energy Group Ningxia Coal Industry Co Ltd Zaoquan Coal Mine | Method for curing heavy metals in coal gangue by using microorganisms |
| CN110130318A (en) * | 2019-05-24 | 2019-08-16 | 南京林业大学 | A kind of construction method of microorganism mixing-filling stake |
| CN111672900A (en) * | 2020-06-01 | 2020-09-18 | 合肥工业大学 | Method for restoring heavy metal pollution of soil by microorganism-induced calcium carbonate precipitation |
| CN111999156A (en) * | 2020-07-29 | 2020-11-27 | 东南大学 | Temperature-controlled high-pressure biological solidification test device and test method thereof |
| CN114149244A (en) * | 2021-12-10 | 2022-03-08 | 临沂海螺新材料科技有限公司 | Method for preparing red mud building material product based on composite microbial technology |
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Application publication date: 20180622 |