CN103360105B - Preparation method of coal gangue-red mud lightweight pottery sand with core-shell structure - Google Patents
Preparation method of coal gangue-red mud lightweight pottery sand with core-shell structure Download PDFInfo
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- CN103360105B CN103360105B CN201310296187.XA CN201310296187A CN103360105B CN 103360105 B CN103360105 B CN 103360105B CN 201310296187 A CN201310296187 A CN 201310296187A CN 103360105 B CN103360105 B CN 103360105B
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Abstract
The invention provides a preparation method of coal gangue-red mud lightweight pottery sand with a core-shell structure, belonging to the technical field of pottery sand. The preparation method comprises the following steps of: preparing a pottery sand core material, namely carrying out ball-milling on 55-70% of coal gangue, 25-40% of red mud, 0-20% of clay and 0.5-1% of aluminium powder in a ball grinding mill, and sieving powder by using a sieve with 200 meshes; adding water to the powder, putting the mixture into a mold, carrying out compression molding on the mixture and crushing the mixture; preparing a pottery sand packaging material, namely carrying out ball-milling on 55-70% of coal gangue, 25-40% of red mud, 0-20% of clay, 5-10% of calcium hydroxide and 0.5-1% of aluminium powder in the ball grinding mill; putting the pottery sand core material in a disc, wetting the pottery sand core material in a spraying manner, adding the pottery sand packaging material to the disc, swaying, sequentially repeating the steps of wetting by spraying, adding the pottery sand packaging material to the disc and swaying, and finally balling; and drying, and sintering at 1100-1300. According to the preparation method, the requirement on sintering expansion temperature range during pottery sand sintering is reduced, thus the threshold of preparing the pottery sand by using solid waste is reduced; and compared with the pottery sand with the same composition, the coal gangue-red mud lightweight pottery sand has the characteristics of energy conservation and consumption reduction.
Description
Technical field
The invention belongs to pottery sand technical field, the light haydite that utilizes large Coal Refuse and red mud to prepare, the method that adopts low-temp foaming, high temperature to burn till is prepared light haydite.Have and save the effect that building materials are manufactured energy consumption.In building energy saving field, have broad application prospects.
Technical background
Coal gangue is the solid waste producing in coal mining and dressing of coal by washing process, accounts for 18% left and right of coal production then.The contaminative waste residue of discharging when red mud is Aluminium industry extraction aluminum oxide, 1 ton of aluminum oxide of the every production of average, produces 1.0～2.0 tons of red muds.Large solid waste comprehensive utilization, the potential safety hazard that how to solve noxious waste pollution environment, causes is the difficult problem facing at present.Coal gangue and red mud prepare light ceramic or pottery sand is the important means of this two classes solid waste building resource.
Current, utilize coal gangue and red mud to prepare light ceramic and pottery sand, obtain certain research at home and abroad, and in disclosed paper, had a lot of reports, also there is the patent of some amount.But with regard to light ceramic, generally all adopt foaming to burn swollen method manufacture.Foaming is burnt swollen method haydite (pottery sand) general requirement firing range at 50-70 ℃.This has just produced higher requirement to the composition of admixtion.The admixtion that especially as high in the ferric oxide such as red mud, the calcium oxide content raw material of solid waste is formed, often needs to allocate more natural resources into, causes the batching cost of haydite to raise.Thereby its industrialization has run into bottleneck.
Summary of the invention
For solving coal gangue-red mud porcelain granule, burn the narrow difficulty of swollen temperature range, the present invention proposes the process modification scheme manufacture pottery sand that low-temp foaming, high temperature burn till, to get around high temperature, burn swollen process.Its technical characterictic is take that gas concrete technique is as reference, adopts nucleocapsid structure and low-temp foaming technology to form pottery sand, then at high temperature burns till.The high temperature that the present invention has got around pottery sand burns swollen process, and outstanding advantages is the firing temperature that has reduced pottery sand, has to a certain extent and saves the effect of burning till energy consumption.
For achieving the above object, technical scheme of the present invention is as follows:
A preparation method for coal gangue-red mud light haydite of nucleocapsid structure, is characterized in that, comprises the following steps:
(1) preparation pottery sand core material: by the sand core material mixing of make pottery of following mass percent: coal gangue 55～70%, red mud 25～40%, clay 0～20%, aluminium powder 0.5～1%, in ball mill, ball milling is crossed 200 mesh sieves; Add water, pack compression moulding under 5MPa pressure in mould into, broken 18～35 mesh sieves of crossing, sand core material obtains making pottery;
Preparation pottery sand wrapper: by the sand wrapper mixing of make pottery of following mass percent: coal gangue 55～70%, red mud 25～40%, clay 0～20%, calcium hydroxide 5～10%, aluminium powder 0.5～1%, in ball mill, ball milling is crossed 200 mesh sieves;
(2) prepared by pottery sand: the resulting pottery sand of step (1) core material is put into disk, and wetting by the mode of spraying, then add pottery sand wrapper and shake, repeat successively above-mentioned spraying and soak and add pottery sand wrapper to shake, final balling-up; By the body drying after balling-up, burn till at 1100～1300 ℃.
The granularity of the obtained pottery sand of the present invention is 0.5～5mm, and tap density is 650～950kg/cm
3.The present invention adopts nucleocapsid structure, take calcium hydroxide and aluminium powder as whipping agent, at low temperatures pottery sand is foamed, and then under hot conditions, burns till, and has reduced the firing temperature of pottery sand, has and reduces the effect of manufacturing energy consumption.
Embodiment
Below in conjunction with embodiment, this aspect is described further, but the present invention is not limited to following examples.
Example 1, by 1 part of coal gangue=60 part, red mud=30 part, clay=9 part, aluminium powder, in ball mill, ball milling is crossed 200 mesh sieves, add suitable quantity of water, pack compression moulding under 5MPa pressure in mould into, broken 18～35 mesh sieves of crossing, obtain mixing coal gangue-red mud-clay compound of aluminium powder, as pottery sand core material.By coal gangue=50 part, red mud=25 part, clay=15 part, calcium hydroxide=9.5 part, aluminium powder=0.5 part, in ball mill, ball milling is crossed 200 mesh sieves, obtains mixing coal gangue-red mud-clay compound of aluminium powder, calcium hydroxide, as pottery sand wrapper again.Resulting pottery sand core material is put into disk, and with the wetting core material of mode of spraying, gradation adds pottery sand wrapper and shakes balling-up.By the body drying after balling-up, at 1100 ℃, burn till.Obtaining tap density is 650kg/cm
3coal gangue-red mud light haydite.
Example 2: by 1 part of coal gangue=55 part, red mud=25 part, clay=19 part, aluminium powder, in ball mill, ball milling is crossed 200 mesh sieves, add suitable quantity of water, pack compression moulding under 5MPa pressure in mould into, broken 18～35 mesh sieves of crossing, obtain mixing coal gangue-red mud-clay compound of aluminium powder, as pottery sand core material.By coal gangue=55 part, red mud=20 part, clay=15 part, calcium hydroxide=9.5 part, aluminium powder=0.5 part, in ball mill, ball milling is crossed 200 mesh sieves, obtains mixing coal gangue-red mud-clay compound of aluminium powder, calcium hydroxide, as pottery sand wrapper again.Resulting pottery sand core material is put into disk, and with the wetting core material of mode of spraying, gradation adds pottery sand wrapper and shakes balling-up.By the body drying after balling-up, at 1150 ℃, burn till.Obtaining tap density is 780kg/cm
3coal gangue-red mud light haydite.
Example 3: by 1 part of coal gangue=70 part, red mud=29 part, aluminium powder, ball milling is crossed 200 mesh sieves in ball mill, adds suitable quantity of water, pack compression moulding under 5MPa pressure in mould into, 18～35 mesh sieves are crossed in fragmentation, obtain mixing coal gangue-red mud-clay compound of aluminium powder, as pottery sand core material.By coal gangue=69 part, red mud=25 part, calcium hydroxide=5 part, aluminium powder=1 part, in ball mill, ball milling is crossed 200 mesh sieves, obtains mixing coal gangue-red mud-clay compound of aluminium powder, calcium hydroxide, as pottery sand wrapper again.Resulting pottery sand core material is put into disk, and with the wetting core material of mode of spraying, gradation adds pottery sand wrapper and shakes balling-up.By the body drying after balling-up, at 1200 ℃, burn till.Obtaining tap density is 880kg/cm
3coal gangue-red mud light haydite.
Example 4; By 1 part of coal gangue=58 part, red mud=25 part, clay=16 part, aluminium powder, in ball mill, ball milling is crossed 200 mesh sieves, add suitable quantity of water, pack compression moulding under 5MPa pressure in mould into, broken 18～35 mesh sieves of crossing, obtain mixing coal gangue-red mud-clay compound of aluminium powder, as pottery sand core material.By coal gangue=54 part, red mud=23 part, clay=15 part, calcium hydroxide=7.5 part, aluminium powder=0.5 part, in ball mill, ball milling is crossed 200 mesh sieves, obtains mixing coal gangue-red mud-clay compound of aluminium powder, calcium hydroxide, as pottery sand wrapper again.Resulting pottery sand core material is put into disk, and with the wetting core material of mode of spraying, gradation adds pottery sand wrapper and shakes balling-up.By the body drying after balling-up, at 1250 ℃, burn till.Obtaining tap density is 900kg/cm
3coal gangue-red mud light haydite.
Example 5: by 1 part of coal gangue=65 part, red mud=34 part, aluminium powder, ball milling is crossed 200 mesh sieves in ball mill, adds suitable quantity of water, pack compression moulding under 5MPa pressure in mould into, 18～35 mesh sieves are crossed in fragmentation, obtain mixing coal gangue-red mud-clay compound of aluminium powder, as pottery sand core material.By coal gangue=55 part, red mud=30 part, clay=9 part, calcium hydroxide=5 part, aluminium powder=1 part, in ball mill, ball milling is crossed 200 mesh sieves, obtains mixing coal gangue-red mud-clay compound of aluminium powder, calcium hydroxide, as pottery sand wrapper again.Resulting pottery sand core material is put into disk, and with the wetting core material of mode of spraying, gradation adds pottery sand wrapper and shakes balling-up.By the body drying after balling-up, at 1300 ℃, burn till.Obtaining tap density is 920kg/cm
3coal gangue-red mud light haydite.
Claims (1)
1. a preparation method for coal gangue-red mud light haydite of nucleocapsid structure, is characterized in that, comprises the following steps:
(1) preparation pottery sand core material: by the sand core material mixing of make pottery of following mass percent: coal gangue 55～70%, red mud 25～40%, clay 0～20%, aluminium powder 0.5～1%, above-mentioned each component percentage composition sum is 100%; In ball mill, ball milling is crossed 200 mesh sieves; Add water, pack compression moulding under 5MPa pressure in mould into, broken 18～35 mesh sieves of crossing, sand core material obtains making pottery;
Preparation pottery sand wrapper: by the sand wrapper mixing of make pottery of following mass percent: coal gangue 55～70%, red mud 25～40%, clay 0～20%, calcium hydroxide 5～10%, aluminium powder 0.5～1%, above-mentioned each component percentage composition sum is 100%; In ball mill, ball milling is crossed 200 mesh sieves;
(2) prepared by pottery sand: the resulting pottery sand of step (1) core material is put into disk, and wetting by the mode of spraying, then add pottery sand wrapper and shake, repeat successively above-mentioned spraying and soak and add pottery sand wrapper to shake, final balling-up; By the body drying after balling-up, burn till at 1100～1300 ℃.
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| CN103951391B (en) * | 2014-04-09 | 2015-07-29 | 北京工业大学 | A kind ofly widen the method that coal gangue-red mud porcelain granule burns swollen temperature |
| CN104072189B (en) * | 2014-07-08 | 2015-10-07 | 尹小林 | The method of light porous agglomerated material is manufactured with red mud and plant residue |
| CN106587962B (en) * | 2016-12-20 | 2020-01-21 | 大连工业大学 | Diatomite-based ceramsite and preparation method thereof |
| CN108249897B (en) * | 2018-01-04 | 2021-03-30 | 济南泉润陶瓷科技有限公司 | Method for preparing cement mill balls from red mud |
| CN115893973B (en) * | 2021-08-03 | 2024-04-26 | 深圳大学 | Titanium oxide fiber doped silica aerogel heat insulation material and preparation method thereof |
| CN116063048A (en) * | 2023-02-08 | 2023-05-05 | 华新水泥股份有限公司 | Ultra-high performance concrete tile and preparation method thereof |
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