CN102674719A - Production method for modifying red mud from bayer process and applications of modified red mud from bayer process - Google Patents
Production method for modifying red mud from bayer process and applications of modified red mud from bayer process Download PDFInfo
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- CN102674719A CN102674719A CN2012101702182A CN201210170218A CN102674719A CN 102674719 A CN102674719 A CN 102674719A CN 2012101702182 A CN2012101702182 A CN 2012101702182A CN 201210170218 A CN201210170218 A CN 201210170218A CN 102674719 A CN102674719 A CN 102674719A
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
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Abstract
The invention discloses a production method for modifying red mud from bayer process and applications of modified red mud from bayer process, belonging to technical fields of comprehensive utilization of environment-friendly industrial waste slag and building material industry. The production method comprises the steps of calcinating the red mud from bayer process and coal gangue, or the red mud from bayer process and cinder, changing the strong basicity of the red mud from bayer process, and mixing the calcinated sinter to obtain the modified red mud from bayer process, which is added in cement as admixture. According to the production method for modifying the red mud from bayer process and applications of the modified red mud from bayer process, a new approach for comprehensive utilization of industrial waste residue coal gangue, especially the red mud from bayer process is created.
Description
Technical field
The present invention relates to " three wastes " utilizes; The comprehensive utilization and the building materials industry technology category that belong to the environment-protecting industrial waste residue; It is waste residue---the method for comprehensive utilization of red mud that the comprehensive utilization bayer process is produced the aluminum oxide discharging; Specifically a kind of working method of modification Bayer process red mud and modification Bayer process red mud are used for manufacture of cement, are added in the cement as mixing material.
Technical background: Bayer process red mud is the waste of bauxite after the hydrometallurgical processes process is extracted aluminum oxide, is also referred to as mine tailing.Utilize one ton of aluminum oxide of the every production of bayer process, output 0.8-1.5 ton red mud (different and different) with bauxite grade and working method.Red mud is the maximum pollutent of alumina producer, still is positioned as dangerous solid waste in the aluminium industry.Present annual in the world output is more than one hundred million tons red mud approximately; Having only seldom, a part obtains utilizing; Many aluminium manufacturers are owing to the red mud processing is not good at both at home and abroad; Caused the serious environmental pollution, also taken a large amount of soils and be used to store up, comprehensive utilization how to carry out red mud is still the global problem that current aluminum oxide industry is produced.For solving this difficult problem, numerous scientific workers have done many useful work, have also invented " a kind of Bayer process red mud shale bricks and the working method thereof " patent No.: ZL201010100016.1 before the inventor.But the amount of producing vitrified brick processing red mud with red mud is limited, does not reach the current requirement to the red mud comprehensive utilization ratio of country far away, and the treatment capacity of red mud effluxes red mud amount well below alumina producer; Red mud pollutes still serious; So the contriver expects being used for manufacture of cement after the Bayer red mud modification, with domestic existing manufacture of cement scale, as long as rational Application; The red mud that alumina producer produces need not efflux fully to be stored up, and can all realize comprehensive utilization.
Though existing cement mixture has various industrial residues, its price is constantly rising violently, as flyash also want 80 yuan per ton, and the trend that supply falls short of demand is arranged.Use red mud not only not spend, and country's subsidy in addition, as long as it is carried out overcoming oxious component wherein after the modification, just can become a kind of cheap and good-quality cement mixture.
Summary of the invention:The objective of the invention is to create a kind of method that changes red mud character, change the strong basicity of red mud, be used for replacing the partially mixed material of manufacture of cement to produce cement, for effective utilization of the red mud of serious environment pollution opens up a new way.
The present invention takes a hint from " a kind of Bayer process red mud shale bricks and working method thereof " (patent No. ZL201010100016.1), and the per kilogram brick only needs the heat of 200 kilocalories to be enough to make the temperature of brickkiln to reach 900～1100 ℃.Common 800 kcal/kg of the thermal value of coal gangue, the thermal value of slag is usually in 700 kcal/kg.Being used for calcining red mud is fully feasible with fixing alkali wherein, and coal gangue also is a kind of waste residue of Coal Production, the colliery that producing coal mountain area, Guizhou spreads all over, and coal gangue has also become a kind of waste residue of contaminate environment.Two kinds of waste residues combine, and produce useful changed red mud product, make it to be used for replacing the partially mixed material of manufacture of cement to produce cement, and are not only favourable but also be feasible fully.
The working method of a kind of modification Bayer process red mud of the present invention is characterized in that Bayer process red mud calcines with slag with coal gangue or Bayer process red mud, changes the strong basicity of Bayer process red mud; The weight percent of red mud and coal gangue or red mud and slag is 75 ﹪～85 ﹪: 25 ﹪～15 ﹪, and summation is in 100%, and method for calcinating the most simply is burnt in a heap; Promptly on the level land, pile one deck priming mixture, lid layer coal gangue or slag, lid layer red mud more then; Blow with gas blower; Lid layer coal gangue or slag again when a little flare appears in the red mud surface, in layer reinforced calcining the so repeatedly, the whole sinters after the completion are mixed into the Bayer process red mud of modification; Be the alkalescent solid sinter, can be used as mixing material and be added in the cement.
The incinerating type of furnace of the present invention can be earth kiln or machine shaft kiln; 600 ℃～800 ℃ of calcining temperatures, the method for calcinating of the present invention in the machine shaft kiln is: also can be with calcining in red mud and slag or the coal gangue proportional mixing adding kiln, because machine shaft kiln heat-insulating property is good but the calcining layering is reinforced in the machine shaft kiln; Can also reduce the consumption of slag or coal gangue; And realizing the mechanize continuous production, temperature also is easy to control, is not prone to underburnt or burn-off phenomenon.
The application of a kind of modification Bayer process red mud of the present invention is characterized in that replacing being added to part flyash or other material in the cement as blended material, and the per-cent that the modification Bayer process red mud accounts for the cement gross weight is 8%～10%.
The add-on of modification Bayer process red mud of the present invention in cement is qualified with radioactive indicator, and not reduce strength of cement be condition.
If only consider from the amount that consumes red mud, it is The more the better to be applied in the manufacture of cement amount of changed red mud, but the incorporation of changed red mud is too much, can cause the cement index not reach national standard, like radioactive index, and alkali content, intensity etc.For the sake of assurance, the high mixture ratio of employed changed red mud blended material is decided to be 10% among the present invention, and in the ratio range of changed red mud blended material 10% incorporation, each item index of cement all can be up to state standards.The proportioning of changed red mud 10% is conservative data; Because the red mud radioactive index of some enterprise and alkali content are all lower; Therefore it all is possible being higher than 10% changed red mud blended material incorporation; Therefore the method for incorporating modified red mud in cement, how many red muds mixes all is the scope of rights protection of the present invention.
Working method of a kind of modification Bayer process red mud of the present invention and uses thereof; Comprise get the raw materials ready, on fire, the calcining; Operation is simple, also power operation such as available forklift of available manual operation, and back on fire adds one deck slag or coal gangue with one deck red mud; The machinery air blast, but equipment such as the also available earth kiln of grading operation, machine shaft kiln are calcined.
The present invention makes the SiO in the favourable sodium hydroxide and red mud and coal gangue in the Bayer process red mud through calcining
2, CaO, Al
2O
3Combine Deng material, make Bayer process red mud become weakly alkaline from alkalescence, the radioactivity in the red mud reaches nontoxic standard fully through the abundant dilution of coal gangue ash content and cement.
In calcination process, coal gangue or slag consumption can not be too high, otherwise can make the too high generation vitreous clinker of sintering temperature, underburnt or burning situation occur.
The present invention has following effect:
1, production technique of the present invention is to utilize slag or coal gangue combustion heating that Bayer process red mud is calcined modification, it is become have chemically reactive.The red mud that the process pressure filter ejects also can be calcined, and can practice thrift slag or coal gangue a bit but do to stack back moisture reduction slightly.
2, production technique of the present invention is simple, and flow process is short, and less investment is produced and is easy to control, if also can be with proportional mixing after direct labor's skilled operation, whole kiln calcining be realized in back on fire.
3, flyash is also wanted 80 yuan/ton in the existing blended material, and the blended material that red mud is made among the present invention is very cheap, and tooling cost is lower than 40 yuan/ton, and good economic benefit is arranged.
4, the effective achievement of the present invention is after burning till blended material through the Bayer process red mud modification; With domestic existing cement mill industrial scale; The red mud that produces during alumina producer is produced ability 100% fully utilizes; The approach that has really found Bayer process red mud to fully utilize in a large number, for another practical way explored in the comprehensive utilization of Bayer process red mud in the aluminum oxide industry production, the red mud zero release is within sight.
5, the present invention utilizes slag or coal gangue to burn red mud, really realizes the treatment of wastes with processes of wastes against one another.
The practical implementation situation:
The working method of embodiment 1. modification Bayer process red muds, i.e. red mud-calcined coal gangue method.
Raw material: red mud-grand calorize worker ltd produces the Bayer process red mud of aluminum oxide institute output, and through analyzing, chemical ingredients is:
SiO 2 13.10%
, Fe 2 O35.81%
Al 2 O 3 23.85%
CaO27.68%
MgO0.87 %
TiO 2 4.71%
K 2 O0.88 %
Na 2 O3.75 %
Loss18.30%
Σ98.86, strong basicity.
Coal gangue-colliery, this area waste through the analytical chemistry composition is:
SiO 2 42.25%
Fe 2 O310.39%
Al 2 O 3 16.15%
CaO1.62%
MgO0.22%
K 2 O0.6%
Loss24.09%
Σ95.32
Grading operation method: heap one deck firewood 30 on the level land
Kg, the firewood that ignites covers coal gangue 150 in firewood bedding scope
Kg, air blast from the bottom.After treating the coal gangue burning, on coal gangue, cover red mud 800 more several times
Kg, continue air blast, treat to cover again when flare appears in the red mud surface one deck coal gangue 150
KgTreat repeatedly to cover red mud more in proportion after the coal gangue burning ... So repeatedly.Produce flame-out cooling behind about 7～8 tons of raw materials, mix back sampling analysis result and be:
SiO 2 21.46%
Fe 2 O38.01%
Al 2 O 3 27.56%
CaO28.70%
MgO0.90%
K 2 O0.91%
Na 2 O3.15 %
Loss2.21%
Σ97.87, weakly alkaline.
The production of embodiment 2. modification Bayer process red muds, i.e. red mud-slag calcination method.
Red mud-grand calorize worker ltd produces the Bayer process red mud of aluminum oxide institute output, and through analyzing, chemical ingredients is:
SiO 2 13.10%
, Fe 2 O35.81%
Al 2 O 3 23.85%
CaO27.68%
MgO0.87 %
TiO 2 4.71%
K 2 O0.88 %
Na 2 O3.75 %
Loss18.30%
Σ98.86, strong basicity.
The refuse that slag-our company's Industrial Boiler is discharged after with coal combustion, through analyzing, chemical ingredients is:
SiO 2 47.27%
Fe 2 O38.45%
Al 2 O 3 19.21%
CaO2.97%
MgO0.31 %
TiO 2 1.02%
Loss17.56
% Σ96.79
The earth kiln method: make the square simple and easy kiln of a 2.5M * 2.5M with refractory brick or ordinary fired brick, a side leaves discharge port, high 1.2M.Also can be built into diameter is the cylindrical of 2.5M and the kiln that stays side's discharge port.The bottom is scattered in the grate shape support with vitrified brick, and is beneficial to ventilation.30 kilograms in brick upper berth one deck firewood, behind the firewood that ignites all the other operations with embodiment 1, add to furnace roof to material till, produce the analysis of about 6～8 tons of postcooling composite sampless, the result is:
SiO 2 21.73%
Fe 2 O37.55%
Al 2 O 3 27.92%
CaO28.81%
MgO0.91 %
TiO 2 5.01%
K 2 O0.89%
Na 2 O3.06 %
Loss1.84%
Σ97.72, weakly alkaline.
Embodiment 3. application of modification Bayer process red mud in cement mixture
Get the embodiment of the invention 1 modification Bayer process red mud
0.5 kg, the grog that shaft kiln cement plant is produced
4.25 kg, phosphogypsum
0.25 kg, mix after 500 * 500 test mills are worn into cement sample, press national standard method detected result such as following table:
Embodiment 4. application of modification Bayer process red mud in cement
Get the embodiment of the invention 2 modification Bayer process red muds
0.5 kg, the grog that shaft kiln cement plant is produced
4.25 kg,
Phosphogypsum
0.25 kg, mix after 500 * 500 test mills are worn into cement sample, press national standard method detected result such as following table:
2. the thermal value of material therefor of the present invention and product or radioactivity parameter:
Data are found out from above table, produce the Portland cement of 32.5 or 42.5 grades respectively with different proportionings, and strength of cement, stability, radioactivity are the requirements that meets the cement GB fully.
?
Claims (6)
1. the working method of a kind of modification Bayer process red mud of the present invention is characterized in that Bayer process red mud calcines with slag with coal gangue or Bayer process red mud, changes the strong basicity of Bayer process red mud; The weight percent of red mud and coal gangue or red mud and slag is 75 ﹪～85 ﹪: 25 ﹪～15 ﹪, and summation is in 100%, and method for calcinating the most simply is burnt in a heap; Promptly on the level land, pile one deck priming mixture, lid layer coal gangue or slag, lid layer red mud more then; Blow with gas blower; Lid layer coal gangue or slag again when a little flare appears in the red mud surface, in layer reinforced calcining the so repeatedly, the whole sinters after the completion are mixed into the Bayer process red mud of modification; Be the alkalescent solid sinter, can be used as mixing material and be added in the cement.
2. the working method of a kind of modification Bayer process red mud according to claim 1 is characterized in that the incinerating type of furnace can be earth kiln or machine shaft kiln, 600 ℃～800 ℃ of calcining temperatures.
3. the working method of a kind of modification Bayer process red mud according to claim 2; It is characterized in that the method for calcinating in the machine shaft kiln is: also can be with calcining in red mud and slag or the coal gangue proportional mixing adding kiln but the calcining layering is reinforced in the machine shaft kiln; Because machine shaft kiln heat-insulating property is good, can also reduces the consumption of slag or coal gangue, and realize the mechanize continuous production; Temperature also is easy to control, is not prone to underburnt or burn-off phenomenon.
4. the working method of a kind of modification Bayer process red mud according to claim 1 is characterized in that priming mixture refers to culled wood, withered grass leaf.
5. according to the application of the described a kind of modification Bayer process red mud of claim 1, it is characterized in that being added to instead of part flyash or other material in the cement as blended material, the per-cent that the modification Bayer process red mud accounts for the cement gross weight is 8%～10%.
6. the application of a kind of modification Bayer process red mud according to claim 5 is characterized in that the add-on of modification Bayer process red mud in cement is qualified with radioactive indicator, and not reduce strength of cement be condition.
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| CN2012101702182A CN102674719A (en) | 2012-05-29 | 2012-05-29 | Production method for modifying red mud from bayer process and applications of modified red mud from bayer process |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105481272A (en) * | 2015-12-23 | 2016-04-13 | 山东大学 | Manufacturing methods of geopolymer and precursor thereof, product and application |
| CN105585261A (en) * | 2015-12-23 | 2016-05-18 | 山东大学 | Geopolymer permeable concrete material, preparation method and application |
| CN107056241A (en) * | 2017-04-28 | 2017-08-18 | 曹红英 | Formula and a kind of environmentally friendly red mud brick or haydite of a kind of environmentally friendly red mud brick or haydite and preparation method thereof |
| CN114477804A (en) * | 2022-02-22 | 2022-05-13 | 中南大学 | Method for preparing high-activity cementing material raw material by cooperation of coal gangue and red mud, high-activity cementing material raw material and application thereof |
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| US3776717A (en) * | 1970-12-04 | 1973-12-04 | Tatabanyai Szenbanyak | Method for processing of red mud |
| CN101648402A (en) * | 2009-09-04 | 2010-02-17 | 昆明理工大学 | Method for producing air entrapping building block by utilizing red mud |
| CN101830707A (en) * | 2010-03-29 | 2010-09-15 | 郑州市磊鑫实业有限公司 | Method for producing baked bricks from alumina red mud |
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2012
- 2012-05-29 CN CN2012101702182A patent/CN102674719A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3776717A (en) * | 1970-12-04 | 1973-12-04 | Tatabanyai Szenbanyak | Method for processing of red mud |
| CN101648402A (en) * | 2009-09-04 | 2010-02-17 | 昆明理工大学 | Method for producing air entrapping building block by utilizing red mud |
| CN101830707A (en) * | 2010-03-29 | 2010-09-15 | 郑州市磊鑫实业有限公司 | Method for producing baked bricks from alumina red mud |
Non-Patent Citations (1)
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| 张娜 等: "复合热活化对赤泥-煤矸石胶凝性能的影响", 《稀有金属材料与工程》 * |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105481272A (en) * | 2015-12-23 | 2016-04-13 | 山东大学 | Manufacturing methods of geopolymer and precursor thereof, product and application |
| CN105585261A (en) * | 2015-12-23 | 2016-05-18 | 山东大学 | Geopolymer permeable concrete material, preparation method and application |
| CN107056241A (en) * | 2017-04-28 | 2017-08-18 | 曹红英 | Formula and a kind of environmentally friendly red mud brick or haydite of a kind of environmentally friendly red mud brick or haydite and preparation method thereof |
| CN114477804A (en) * | 2022-02-22 | 2022-05-13 | 中南大学 | Method for preparing high-activity cementing material raw material by cooperation of coal gangue and red mud, high-activity cementing material raw material and application thereof |
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