CN104891933A - Carbon negative red mud based building material and preparation method thereof - Google Patents
Carbon negative red mud based building material and preparation method thereof Download PDFInfo
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- CN104891933A CN104891933A CN201510252008.1A CN201510252008A CN104891933A CN 104891933 A CN104891933 A CN 104891933A CN 201510252008 A CN201510252008 A CN 201510252008A CN 104891933 A CN104891933 A CN 104891933A
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- red mud
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
Abstract
The invention relates to a carbon negative red mud based building material and a preparation method thereof; a mixed material is prepared from red mud (the moisture content is less than 25%, and if the water content is more than 25%, drying treatment is carried out) and carbonated active solid waste and is subjected to extrusion forming to obtain a blank, then the blank is put into a carbonation reaction kettle and subjected to a carbonation reaction, and thus the red mud based building material is obtained. The technical problem of red mud utilization is solved, all naturally air-cured red mud in a red mud dam can be directly utilized and has no need of alkali removal treatment, and the cost of production is reduced. The industrial waste utilization rate is high, negative carbon and energy saving are achieved, 0.1-0.2 t of CO2 can be absorbed by production of 1 t of the red mud based building material, the product is green and environmentally friendly, physical and mechanical properties are excellent, the production cycle is short, and no saltpetering appears. By adjusting the forming process and the material composition, all kinds of building blocks, sheet materials, bricks and other building products (can be solid, hollow or porous in mode) can be prepared, and good social, economic and environmental benefits are achieved.
Description
Technical field
The present invention relates to a kind of red mud building materials, particularly a kind of carbon negativity red mud building materials and preparation method thereof.
Background technology
Red mud is the solid slag of discharging in aluminum oxide production process, often produces 1t aluminum oxide and approximately will discharge 1.0 ~ 2.0t red mud.At present, China's red mud comprehensive utilization ratio only 4%, accumulation volume of cargo in storage has reached several hundred million t.China's alumina producer mostly adopts outdoor mode of building a dam to store up red mud, and this disposal options not only takies big area soil, and the alkali in red mud also to subsurface wastewater infiltration system, can cause body of groundwater and soil pollution.Meanwhile, the fine dusts that exposed red mud is formed is flown away with the wind, also can atmosphere pollution, worsens ecotope, causes have a strong impact on the mankind and vegeto-animal existence.Therefore, how processing a large amount of red muds discharged in aluminum oxide production process, reduce environmental pollution, is an alumina industry difficult problem urgently to be resolved hurrily.
The potential Application Areas of red mud mainly comprises: valuable metal recovery, compaction material, pollutant control, additive, catalyzer and material of construction etc., but great majority utilize technology all to there is the problem such as consumption ability and second stage employ amount wretched insufficiency, utilizing red mud to manufacture material of construction is the technology most possibly realizing red mud large volume treatment and use, but also there is following technical problem:
The high alkalinity of red mud, high-moisture percentage characteristic, need when utilizing to carry out the pre-treatment such as dealkalize, drying to red mud, cost is higher;
Red mud contains a lot of alkalies and alkaline earth oxide compounds, is directly used in material of construction, often occurs " accumulation of salt in the surface soil phenomenon " (red mud goods are placed for some time top layer in air and be there will be one deck " bloom ").
Summary of the invention
In sum, in order to solve existing technical problem, technical scheme of the present invention is as follows:
A kind of carbon negativity red mud building materials, with weight parts, its raw materials comprises:
Red mud 50-95 part
Carbonating active solid waste 5-50 part.
Further, described red mud is at least one in Bayer process, sintering process and hybrid system.
Further, the water ratio of described red mud is less than 25%, and water ratio is greater than 25% will through drying treatment.
Further, described carbonating active solid waste is at least one in carbide slag, used lime, waste gypsum, waste cement, waste concrete, granulated blast-furnace slag etc.
A preparation method for carbon negativity red mud building materials, comprises the following steps:
Step one, red mud and carbonating active solid waste are fully mixed after, obtain compound, its water content control is at 10-15%;
Step 2, compound prepared by step one is poured into mould, obtain idiosome by extrusion molding, forming pressure is 15-35Mpa;
Step 3, idiosome prepared by step 2 is put into carbonation reaction still, pass into CO
2gas, control reacting kettle inner pressure at 0.15-0.35MPa, temperature 20 DEG C-80 DEG C in reactor, carbonation reaction 8-48h, obtains negativity red mud building materials.
the invention has the beneficial effects as follows:
1. utilization rate of solid waste of the present invention is high, especially red mud, and the most high energy of its utilization ratio reaches 95%.
2. reaction conditions of the present invention is gentle, absorbs CO in production process
2, negative carbon is energy-conservation, environmental protection, and often producing 1t red mud building materials can absorb 0.1-0.2tCO
2.
3. the invention solves the technical barrier that red mud utilizes, do not need to carry out drying (in Red Mud Dam, the red mud of natural drying all can directly utilize), dealkalize process to red mud, reduce production cost.
4. the present invention can prepare the building products such as various building block, sheet material, brick (can be the forms such as solid, hollow or porous) by adjustment moulding process and material composition, and life cycle of the product is short, and without accumulation of salt in the surface soil phenomenon, physical and mechanical property is excellent.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail.Starting material used in following embodiment, if no special instructions, are industrial solid castoff.
embodiment 1:
A kind of carbon negativity red mud building materials, its preparation method is as follows:
Number described in following embodiment is parts by weight.
Step one, Bayer process red mud 90 parts and white lime 10 parts, the chemical group prejudice table 1 of raw material, after fully mixing, obtains compound.
Step 22, compound prepared by step one is poured into mould, obtain idiosome by extrusion molding, forming pressure is 25MPa.
Step 3, idiosome prepared by step 2 is put into carbonation reaction still, pass into CO
2gas, control reacting kettle inner pressure at 0.15MPa, temperature 20 DEG C in reactor, carbonation reaction 8h, obtains required red mud building materials.Ultimate compression strength 26.83MPa.
The chemical constitution (%) of table 1 raw material
| SiO 2 | Al 2O 3 | Fe 2O 3 | CaO | MgO | K 2O | Na 2O | TiO 2 | LOI a | |
| Red med（bayer） | 17.84 | 18.82 | 10.35 | 28.62 | 1.32 | 0.78 | 1.46 | 3.57 | 16.28 |
| Hydrated lime | 1.1 | 0.5 | 0.1 | 53.2 | 0.5 | 0.1 | 0.15 | 43.6 |
aLOI: Loss on ignition.
embodiment 2:
A kind of carbon negativity red mud building materials, its preparation method is as follows:
Step one, Bayer process red mud 60 parts and waste cement 30 parts, the chemical group prejudice table 2 of raw material, after fully mixing, then adds tap water 10 parts of stirrings and obtains compound.
Step 2, compound prepared by step one is poured into mould, obtain idiosome by extrusion molding, forming pressure is 25MPa.
Step 3, idiosome prepared by step 2 is put into carbonation reaction still, pass into CO
2gas, control reacting kettle inner pressure at 0.25MPa, temperature 25 DEG C in reactor, carbonation reaction 16h, obtains required red mud building materials.Ultimate compression strength 47.63MPa.
The chemical constitution (%) of table 2 raw material
| SiO 2 | Al 2O 3 | Fe 2O 3 | CaO | MgO | K 2O | Na 2O | TiO 2 | LOI a | |
| Red med（bayer） | 17.84 | 18.82 | 10.35 | 28.62 | 1.32 | 0.78 | 1.46 | 3.57 | 16.28 |
| Waste cement | 21.1 | 5.5 | 3.1 | 63.2 | 1.5 | 0.3 | 0.15 | 5.1 |
aLOI: Loss on ignition.
embodiment 3:
A kind of carbon negativity red mud building materials, its preparation method is as follows:
Step one, Bayer process red mud 70 parts and white lime 25 parts are fully mixed after, the chemical group prejudice table 3 of raw material, then add tap water 5 parts of stirrings and obtain compound.
Step 2, compound prepared by step one is poured into mould, obtain idiosome by extrusion molding, forming pressure is 25MPa.
Step 3, idiosome prepared by step 2 is put into carbonation reaction still, pass into CO
2gas, control reacting kettle inner pressure at 0.25MPa, temperature 30 DEG C in reactor, carbonation reaction 16h, obtains required red mud building materials.Ultimate compression strength 36.10MPa.
The chemical constitution (%) of table 3 raw material
| SiO 2 | Al 2O 3 | Fe 2O 3 | CaO | MgO | K 2O | Na 2O | TiO 2 | LOI a | |
| Red med（bayer） | 17.84 | 18.82 | 10.35 | 28.62 | 1.32 | 0.78 | 1.46 | 3.57 | 16.28 |
| hydrated lime | 1.1 | 0.5 | 0.1 | 53.2 | 0.5 | 0.1 | 0.15 | 43.6 |
aLOI: Loss on ignition.
embodiment 4:
A kind of carbon negativity red mud building materials, its preparation method is as follows:
Step one, Bayer process red mud 95 parts and white lime 5 parts, the chemical group prejudice table 4 of raw material, after fully mixing, obtains compound.
Step 2, compound prepared by step one is poured into mould, obtain idiosome by extrusion molding, forming pressure is 25MPa.
Step 3, idiosome prepared by step 2 is put into carbonation reaction still, pass into CO
2gas, control reacting kettle inner pressure at 0.15MPa, temperature 20 DEG C in reactor, carbonation reaction 8h, obtains required red mud building materials.Ultimate compression strength 26.38MPa.
The chemical constitution (%) of table 4 raw material
| SiO 2 | Al 2O 3 | Fe 2O 3 | CaO | MgO | K 2O | Na 2O | TiO 2 | LOI a | |
| Red med（sintering） | 17.15 | 8.06 | 9.82 | 37.02 | 0.97 | 2.1 | 2.3 | 4.65 | 17.28 |
| hydrated lime | 1.1 | 0.5 | 0.1 | 53.2 | 0.5 | 0.1 | 0.15 | 43.6 |
aLOI: Loss on ignition.
embodiment 5:
A kind of carbon negativity red mud building materials, its preparation method is as follows:
Step one, Bayer process red mud 50 parts and white lime 50 parts, after fully mixing, the chemical group prejudice table 5 of raw material, after fully mixing, obtains compound.
Step 2, compound prepared by step one is poured into mould, obtain idiosome by extrusion molding, forming pressure is 35MPa.
Step 3, idiosome prepared by step 2 is put into carbonation reaction still, pass into CO
2gas, control reacting kettle inner pressure at 0.25MPa, temperature 20 DEG C in reactor, carbonation reaction 24h, obtains required red mud building materials.Ultimate compression strength 64.34MPa.
The chemical constitution (%) of table 5 raw material
| SiO 2 | Al 2O 3 | Fe 2O 3 | CaO | MgO | K 2O | Na 2O | TiO 2 | LOI a | |
| Red med（sintering） | 17.15 | 8.06 | 9.82 | 37.02 | 0.97 | 2.1 | 2.3 | 4.65 | 17.28 |
| hydrated lime | 1.1 | 0.5 | 0.1 | 53.2 | 0.5 | 0.1 | 0.15 | 43.6 |
aLOI: Loss on ignition.
Although above the present invention is described in detail with a general description of the specific embodiments, on basis of the present invention, can make some modifications or improvements it, this will be apparent to those skilled in the art.Therefore, these modifications or improvements without departing from theon the basis of the spirit of the present invention, all belong to the scope of protection of present invention.
Claims (5)
1. a carbon negativity red mud building materials, is characterized in that wherein: represent with weight part, and its raw materials comprises:
Red mud 50-95 part
Carbonating active solid waste 5-50 part.
2. a kind of carbon negativity red mud building materials according to claim 1, is characterized in that: described red mud is at least one in Bayer process, sintering process and hybrid system.
3. a kind of carbon negativity red mud building materials according to claim 1, it is characterized in that: the water ratio of described red mud is less than 25%, water ratio is greater than 25% will through drying treatment.
4. a kind of carbon negativity red mud building materials according to claim 1, is characterized in that: described carbonating active solid waste is at least one in carbide slag, used lime, waste gypsum, waste cement, waste concrete, granulated blast-furnace slag etc.
5. the preparation method of a kind of carbon negativity red mud building materials according to claim 1, is characterized in that: the method comprises the following steps:
Step one, red mud and carbonating active solid waste are fully mixed after, obtain compound, its water content control is at 10-15%;
Step 2, compound prepared by step one is poured into mould, obtain idiosome by extrusion molding, forming pressure is 15-35Mpa;
Step 3, idiosome prepared by step 2 is put into carbonation reaction still, pass into CO
2gas, control reacting kettle inner pressure at 0.15-0.35MPa, temperature 20 DEG C-80 DEG C in reactor, carbonation reaction 8-48h, obtains carbon negativity red mud building materials.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107129243A (en) * | 2017-04-25 | 2017-09-05 | 东南大学 | It is a kind of to accelerate the method that mineralising prepares red mud building material based on microorganism |
| WO2020015465A1 (en) * | 2018-10-10 | 2020-01-23 | 河南理工大学 | Building material product prepared using building gypsum and slaked lime, and preparation method for building material product |
| CN113135727A (en) * | 2021-04-19 | 2021-07-20 | 山东高速集团有限公司 | Red mud-based material for roadbed water stabilization layer and preparation method thereof |
| CN113896466A (en) * | 2021-10-28 | 2022-01-07 | 山东汉博昱洲新材料有限公司 | Red mud consolidation method based on carbonation reaction and obtained carbonized product |
| CN113929394A (en) * | 2021-10-28 | 2022-01-14 | 山东汉博昱洲新材料有限公司 | Red mud-based carbonized brick and preparation method thereof |
| CN114031355A (en) * | 2021-11-25 | 2022-02-11 | 山东汉博昱洲新材料有限公司 | Porous phase material composite red mud brick and preparation method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107129243A (en) * | 2017-04-25 | 2017-09-05 | 东南大学 | It is a kind of to accelerate the method that mineralising prepares red mud building material based on microorganism |
| WO2020015465A1 (en) * | 2018-10-10 | 2020-01-23 | 河南理工大学 | Building material product prepared using building gypsum and slaked lime, and preparation method for building material product |
| CN113135727A (en) * | 2021-04-19 | 2021-07-20 | 山东高速集团有限公司 | Red mud-based material for roadbed water stabilization layer and preparation method thereof |
| CN113896466A (en) * | 2021-10-28 | 2022-01-07 | 山东汉博昱洲新材料有限公司 | Red mud consolidation method based on carbonation reaction and obtained carbonized product |
| CN113929394A (en) * | 2021-10-28 | 2022-01-14 | 山东汉博昱洲新材料有限公司 | Red mud-based carbonized brick and preparation method thereof |
| CN113929394B (en) * | 2021-10-28 | 2022-11-08 | 山东汉博昱洲新材料有限公司 | Red mud-based carbonized brick and preparation method thereof |
| CN114031355A (en) * | 2021-11-25 | 2022-02-11 | 山东汉博昱洲新材料有限公司 | Porous phase material composite red mud brick and preparation method thereof |
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Application publication date: 20150909 |
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