CN101468905A - Red mud unburned brick and preparation thereof - Google Patents

Red mud unburned brick and preparation thereof Download PDF

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Publication number
CN101468905A
CN101468905A CNA2007103056969A CN200710305696A CN101468905A CN 101468905 A CN101468905 A CN 101468905A CN A2007103056969 A CNA2007103056969 A CN A2007103056969A CN 200710305696 A CN200710305696 A CN 200710305696A CN 101468905 A CN101468905 A CN 101468905A
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China
Prior art keywords
red mud
baking
free brick
brick
weight
Prior art date
Application number
CNA2007103056969A
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Chinese (zh)
Inventor
刘贵堂
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刘贵堂
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Priority to CNA2007103056969A priority Critical patent/CN101468905A/en
Publication of CN101468905A publication Critical patent/CN101468905A/en

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Classifications

    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/14Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing calcium sulfate cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/10Lime cements or magnesium oxide cements
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/0004Compounds chosen for the nature of their cations
    • C04B2103/001Alkaline earth metal or Mg-compounds
    • C04B2103/0012Mg
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/0068Ingredients with a function or property not provided for elsewhere in C04B2103/00
    • C04B2103/0094Agents for altering or buffering the pH; Ingredients characterised by their pH
    • CCHEMISTRY; METALLURGY
    • C04CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04BLIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2103/00Function or property of ingredients for mortars, concrete or artificial stone
    • C04B2103/60Agents for protection against chemical, physical or biological attack
    • C04B2103/601Agents for increasing frost resistance
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02WCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00Technologies for solid waste management
    • Y02W30/50Reuse, recycling or recovery technologies
    • Y02W30/91Use of waste materials as fillers for mortars or concrete

Abstract

The invention discloses a red mud baking-free brick and a preparation method thereof. The red mud baking-free brick mainly comprises the following components by weight portion: 5 to 30 portions of red mud, 20 to 30 portions of coal ash, 20 to 50 portions of quartz sand or crushed stone powder, 5 to 15 portions of lime, 2 to 8 portions of gypsum, and 0 to 3 portions of cement. Each property of the red mud baking-free brick accords with requirement, the compressive strength and the breaking strength of the red mud baking-free brick reach superior grades of the national standard, and other performance indexes accord with the requirements; and radioactive elements in the red mud are subjected to powerful attenuation and shielding in particular, so as to remarkably reduce radiological hazard in the brick. Moreover, a certain amount of magnesium sulphate is added into the red mud baking-free brick, so as to effectively neutralize large amount of free alkali in the red mud, and eliminate brick surface scumming phenomenon caused by the large amount of the free alkali in the red mud.

Description

Baking-free brick of red mud and preparation method thereof

Technical field

The present invention relates to a kind of material of construction, relate in particular to a kind of main utilization and from bauxite, refine baking-free brick of red mud that industrial solid wastes-red mud of getting rid of behind the aluminum oxide forms for feedstock production and preparation method thereof, belong to building material field.

Background technology

Red mud is to refine the industrial solid wastes of discharging behind the aluminum oxide from bauxite.It is big generally to contain the ferric oxide amount, and outward appearance is similar to redness of the skin or complexion earth, thereby gains the name.Aluminium content is high in the bauxite, adopts the bayer's process aluminium metallurgy, and the red mud that is produced claims Bayer process red mud; Aluminium content is low in the bauxite, and with sintering process or with sintering process and bayer's process associating aluminium metallurgy, the red mud that is produced is called red mud from sintering process or integrated process red mud.

The physical properties of red mud: 0.088~0.25 millimeter of particle diameter, proportion 2.7~2.9, unit weight 0.8~1.0,1200~1250 ℃ of fusing points.Produce 1 ton of aluminum oxide and will discharge 0.6~2.0 ton of red mud.About 6,000 ten thousand tons of the annual discharging in whole world red mud, China is about 15 only to the utilization ratio of red mud, the country that has enters red mud marine, because of containing objectionable impurities Marine Pollution such as alkali, endangers fish production.What have stacks on land, takies the farmland, pollutes water system, waves with the wind after the drying, again atmosphere pollution.In order to reduce pollution, watertight layer should be laid in the red mud dump bottom, shop soil plantation plant on the red mud heap.But actively reasonable approach is to carry out comprehensive utilization, as producing material of construction, soil improvement agent with red mud, and reclaims wherein metal etc.

Since the forties, many countries have proposed tens kinds of methods with regard to the comprehensive utilization of red mud, but the overwhelming majority does not reach industrial requirement, mainly are that the dehydration energy consumption is big because the red mud slurry is difficult for drying.In addition, the content height of iron and alkali also is unfavorable for making cement in this red mud.As in order to ironmaking, alkali wherein can corrode the refractory materials of furnace lining, and the titanium oxide in the red mud also can make slag viscosity increase, cause blast furnace operating difficulty etc., in addition, the radioelement in the red mud also substantially exceeds national limit standard, and these have all seriously restricted the comprehensive utilization of red mud.

Summary of the invention

The present invention's technical problem at first to be solved is to overcome the deficiencies in the prior art, providing a kind of is the baking-free brick of red mud that main raw material is prepared from the red mud, this baking-free brick of red mud has not only been eliminated the existing "dead" pollution of red mud, and its every performance index all meet the requirement of material of construction.

The present invention's technical problem at first to be solved is achieved through the following technical solutions:

A kind of baking-free brick of red mud, mainly form by each component of following weight part:

Red mud 5-30 part, flyash 20-30 part, quartz sand or rubble powder 20-50 part, lime 5-15 part, gypsum 2-8 part;

Preferably, the weight part of each component is:

Red mud 8-25 part, flyash 24-30 part, quartz sand or rubble powder 25-30 part, lime 8-12 part, gypsum 3-5 part;

Preferred, the weight part of each component is:

20 parts of red muds, 25 parts in flyash, quartz sand or 28 parts in rubble powder, 10 parts in lime, 4 parts in gypsum;

Wherein, described red mud can be that dried red mud (shelf-time is more than 10 years) also can be wet red mud (shelf-time is in 1 year), and preferred, described red mud is made up of according to the part by weight of 5:0.8 wet red mud and dried red mud.

The particle diameter of described quartz sand or rubble powder is controlled at below the 10mm;

Described flyash can be that the dry powder coal ash also can be a wet fly-ash;

In order to reach more excellent effect, also can contain the cement of 0-3 weight part in the said components, be preferably the cement that contains 1 weight part.

For eliminate or in and existing too much free alkali in the red mud, also can contain the sal epsom of 0.0002-0.0005 weight part in the above-mentioned composition, more preferably the sal epsom of 0.00025 weight part.

Another technical problem to be solved by this invention provides a kind of method for preparing above-mentioned baking-free brick of red mud.

Another technical problem to be solved by this invention is achieved through the following technical solutions:

(1) gets each component by described weight part;

(2) red mud is pulverized, the control particle diameter is less than 10mm; Terra alba is broken into fine powder, crosses the 160-200 mesh sieve; Quartz sand or rubble powder are ground into fine powder, and the control particle diameter is less than 10mm;

(3) after flyash, quartz sand or rubble powder, lime, gypsum and sal epsom mix, with stir, ageing is handled, add cement again and a certain amount of water (controlling moisture content is between 10-15%) stirs afterwards, compression moulding, maintenance, promptly.

Wherein, described maintenance is natural curing or steam press maintenance; Natural curing is meant that spray water maintenance at room temperature dispatched from the factory in 28 days; It is to keep-up pressure under the 1.2Mpa 4 hours that steam press maintenance is meant at vapor pressure, deposits after steam-cured and dispatches from the factory in 7 days.

Every performance of baking-free brick of red mud of the present invention all meets the requirements, the excellent grade that its ultimate compression strength and folding strength all are up to state standards, and other every performance index all meet the requirements; Especially the radioelement in the red mud is carried out strong decay and shielding, significantly reduced radiological hazard wherein.In addition, add a certain amount of sal epsom in the baking-free brick of red mud of the present invention, a large amount of free alkali that is contained in the red mud that effectively neutralized has been eliminated because the phenomenon of a large amount of brick that free alkali the caused surface scum that is contained in the red mud.

Embodiment

Further describe the present invention below in conjunction with specific embodiment, advantage of the present invention and characteristics will be more clear along with description.But these embodiment only are exemplary, scope of the present invention are not constituted any restriction.It will be understood by those skilled in the art that and down can make amendment or replace without departing from the spirit and scope of the present invention, but these modifications and replacing all fall within the scope of protection of the present invention the details of technical solution of the present invention and form.

The preparation of embodiment 1 baking-free brick of red mud

Get each component by following weight: dried red mud 8; Flyash 24, quartz sand (it is following that its particle diameter is controlled at 10mm) 25, lime 8, gypsum 3, cement 1, sal epsom 0.0002;

Red mud is pulverized, and the control particle diameter is less than 10mm; Terra alba is broken into fine powder, crosses the 160-200 mesh sieve; Quartz sand powder is broken into fine powder, and the control particle diameter is less than 10mm;

After red mud, flyash, quartz sand, lime, gypsum and sal epsom mixed, with the mode with the rolling stirring stirs again after the chapelet lifting, ageing is handled, add cement again and a certain amount of water (controlling moisture content is between 10-15%) stirs afterwards, compression moulding, spray water maintenance at room temperature 28 days, promptly.

The preparation of embodiment 2 baking-free brick of red mud

Get each component by following weight: dried red mud 25; Flyash 30, rubble powder (it is following that its particle diameter is controlled at 10mm) 30, lime 12, gypsum 5, cement 3, sal epsom 0.0005;

Dried red mud is pulverized, and the control particle diameter is less than 10mm; Terra alba is broken into fine powder, crosses the 160-200 mesh sieve; The rubble powder is ground into fine powder, and the control particle diameter is less than 10mm;

After dried red mud, flyash, rubble powder, lime, gypsum and sal epsom mixed, with the mode with the rolling stirring stirs again after the chapelet lifting, ageing is handled, add cement again and a certain amount of water (controlling moisture content is between 10-15%) stirs afterwards, compression moulding, at vapor pressure is to keep-up pressure under the 1.2Mpa 4 hours, deposit after steam-cured and dispatched from the factory in 7 days, promptly.

The preparation of embodiment 3 baking-free brick of red mud

Get each component by following weight: dried red mud 3.5, wet red mud 21.5; Flyash 30, quartz sand (it is following that its particle diameter is controlled at 10mm) 30, lime 12, gypsum 5, cement 3, sal epsom 0.0005;

Red mud is pulverized, and the control particle diameter is less than 10mm; Terra alba is broken into fine powder, crosses the 160-200 mesh sieve; The rubble powder is ground into fine powder, and the control particle diameter is less than 10mm;

After red mud, flyash, rubble powder powder, lime, gypsum and sal epsom mixed, with the mode with the rolling stirring stirs again after the chapelet lifting, ageing is handled, add cement again and a certain amount of water (controlling moisture content is between 10-15%) stirs afterwards, compression moulding, at vapor pressure is to keep-up pressure under the 1.2Mpa 4 hours, deposit after steam-cured and dispatched from the factory in 7 days, promptly.

The preparation of embodiment 4 baking-free brick of red mud

Get each component by following weight: dried red mud 2.8, wet red mud 17.2; Flyash 25, quartz sand (it is following that its particle diameter is controlled at 10mm) 28, lime 10, gypsum 4, cement 1, sal epsom 0.00025;

Red mud is pulverized, and the control particle diameter is less than 10mm; Terra alba is broken into fine powder, crosses the 160-200 mesh sieve; Quartz sand powder is broken into fine powder, and the control particle diameter is less than 10mm;

After red mud, flyash, quartz sand, lime, gypsum and sal epsom mixed, with the mode with the rolling stirring stirs again after the chapelet lifting, ageing is handled, add cement again and a certain amount of water (controlling moisture content is between 10-15%) stirs afterwards, compression moulding, spray water maintenance at room temperature 28 days, promptly.

Test every Performance Detection test of routine baking-free brick of red mud of the present invention

Given the test agent: the baking-free brick of red mud that the embodiment of the invention 1,2,3 and 4 is prepared is numbered given the test agent 1, given the test agent 2, given the test agent 3 and given the test agent 4 respectively;

One, the resistance to compression of baking-free brick of red mud of the present invention and folding strength detect test

The baking-free brick of red mud of the present invention of natural curing is carried out resistance to compression and folding strength detects test according to the standard of JC422-91, detected result sees Table 1.

The resistance to compression of table 1 baking-free brick of red mud of the present invention and folding strength detect test

The baking-free brick of red mud of the present invention of natural curing is carried out resistance to compression and folding strength detects test according to the standard of JB11945-1999, detected result sees Table 2.

The resistance to compression of table 2 baking-free brick of red mud of the present invention and folding strength detect test

Two, the over-all properties detected result of baking-free brick of red mud of the present invention

With the radioactivity of given the test agent 1, given the test agent 2, given the test agent 3 and given the test agent 4, freeze each property performance such as back intensity, drying shrinkage, charing coefficient, visual appearance and carried out comprehensive detection, the results are shown in Table 3 after the detection.

The over-all properties detected result of table 3 baking-free brick of red mud of the present invention

Test item performance requriements detected result (mean value) Radioactivity, (internal radiation) specific activity restraint-type≤1 internal radiation index, 0.15 radioactivity, (external radiation exposure) specific activity restraint-type≤qualified d=0.08 charing of 1 internal radiation index, 0.38 visual appearance d≤5 o'clock size deviation COEFFICIENT K c 〉=0.80 Kc=0.95 freezes back intensity 〉=12.0Mpa 31.2Mpa drying shrinkage≤0.75mmm -1??????0.53????????????????

Annotate: detect according to the national standard of GB6566-2001 " the radioactive material nucleic is limited the quantity of " radioactivity to baking-free brick of red mud of the present invention; According to this examination criteria, the internal radiation index of red mud is 1.6, and the external radiation exposure index is 2.1, national head and shoulders above standard of limiting the quantity of.

Claims (8)

1, a kind of baking-free brick of red mud, mainly form by each component of following weight part:
Red mud 5-30 part, flyash 20-30 part, quartz sand or rubble powder 20-50 part, lime 5-15 part, gypsum 2-8 part, cement 0-3 part.
According to the baking-free brick of red mud of claim 1, it is characterized in that 2, the weight part of each component is: red mud 8-25 part, flyash 24-30 part, quartz sand or rubble powder 25-30 part, lime 8-12 part, gypsum 3-5 part.
According to the baking-free brick of red mud of claim 2, it is characterized in that 3, the weight part of each component is: 20 parts of red muds, 25 parts in flyash, quartz sand or 28 parts in rubble powder, 10 parts in lime, 4 parts in gypsum.
4, according to any one baking-free brick of red mud of claim 1-3, it is characterized in that: described red mud is dried red mud or wet red mud, or is made up of dried red mud and wet red mud.
5, according to the baking-free brick of red mud of claim 4, it is characterized in that: described red mud is made up of according to the part by weight of 5:0.8 wet red mud and dried red mud.
6, according to any one baking-free brick of red mud of claim 1-3, it is characterized in that: the sal epsom that also contains the 0.0002-0.0005 weight part.
7, according to the baking-free brick of red mud of claim 6, it is characterized in that: the weight part of sal epsom is 0.00025.
8, a kind of method for preparing the described baking-free brick of red mud of claim 1 comprises:
(1) gets each component by described weight part;
(2) red mud is pulverized, the control particle diameter is less than 10mm; Terra alba is broken into fine powder, crosses the 160-200 mesh sieve; Quartz sand or rubble powder are ground into fine powder, and the control particle diameter is less than 10mm;
(3) after flyash, quartz sand or rubble powder, lime and gypsum mix, stir, ageing handles, and adds cement and water again, controlling moisture content continues to stir between 10-15%, compression moulding, maintenance, promptly.
CNA2007103056969A 2007-12-28 2007-12-28 Red mud unburned brick and preparation thereof CN101468905A (en)

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Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102381864A (en) * 2011-07-26 2012-03-21 昆明理工大学 Unburned brick prepared from main materials of red mud and magnesium slag
CN102689361A (en) * 2011-03-21 2012-09-26 陈铃 Preparation method of stone powder brick
CN102826802A (en) * 2012-09-27 2012-12-19 遵义市贵科科技有限公司 Red mud unfired light-weight insulating brick
CN103130455A (en) * 2011-11-23 2013-06-05 洛阳路世丰土壤固化剂研究中心 Red mud concrete and production method thereof
CN103172313A (en) * 2013-03-20 2013-06-26 冯斌 Waste-utilization type flue-gas channel
CN103449775A (en) * 2013-08-20 2013-12-18 杨林江 Building baking-free bricks and production method thereof
CN103553492A (en) * 2013-10-16 2014-02-05 山东大学 Braking-free brick mainly prepared from polyaluminum chloride waste residues and red mud and preparation method thereof
CN103964801A (en) * 2014-02-25 2014-08-06 内蒙古蒙西鄂尔多斯铝业有限公司 Method for preparing baking-free brick or building block by aluminum oxide by-product extracted from coal ash
CN105218064A (en) * 2015-08-24 2016-01-06 昆明理工大学 It is a kind of that to be main material with red mud As polluted soil non-burning brick
CN105693156A (en) * 2013-01-15 2016-06-22 晋江市闽亿再生资源有限公司 Innovative preparation method of heat-resistant baking-free brick
CN105819802A (en) * 2013-01-15 2016-08-03 晋江市闽亿再生资源有限公司 Improved preparation method of heatproof baking-free brick
CN106986607A (en) * 2017-05-10 2017-07-28 柳州市够旺贸易有限公司 Flyash brick manufacture method
CN107244866A (en) * 2017-05-10 2017-10-13 柳州市够旺贸易有限公司 Flyash brick production technology
CN108191368A (en) * 2018-02-05 2018-06-22 合肥市大卓电力有限责任公司 A kind of environment-friendly baking-free bricks that useless medical gypsum manufacture is recycled using orthopaedics
CN109133890A (en) * 2018-09-28 2019-01-04 佛山齐安建筑科技有限公司 A kind of preparation method of anticorrosive pressure-resisting type bearing bricks
CN109603452A (en) * 2018-12-21 2019-04-12 昆明理工大学 A method of it improving red mud and holds sulfur content and recycling

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102689361A (en) * 2011-03-21 2012-09-26 陈铃 Preparation method of stone powder brick
CN102689361B (en) * 2011-03-21 2016-06-15 陈铃 A kind of preparation method of stone dust brick
CN102381864A (en) * 2011-07-26 2012-03-21 昆明理工大学 Unburned brick prepared from main materials of red mud and magnesium slag
CN103130455A (en) * 2011-11-23 2013-06-05 洛阳路世丰土壤固化剂研究中心 Red mud concrete and production method thereof
CN102826802A (en) * 2012-09-27 2012-12-19 遵义市贵科科技有限公司 Red mud unfired light-weight insulating brick
CN105819802A (en) * 2013-01-15 2016-08-03 晋江市闽亿再生资源有限公司 Improved preparation method of heatproof baking-free brick
CN105859196A (en) * 2013-01-15 2016-08-17 晋江市闽亿再生资源有限公司 Method for preparing heat-resistant baking-free bricks
CN105693156A (en) * 2013-01-15 2016-06-22 晋江市闽亿再生资源有限公司 Innovative preparation method of heat-resistant baking-free brick
CN103172313A (en) * 2013-03-20 2013-06-26 冯斌 Waste-utilization type flue-gas channel
CN103449775B (en) * 2013-08-20 2015-09-23 杨林江 A kind of non-burning brick and manufacture method for building
CN103449775A (en) * 2013-08-20 2013-12-18 杨林江 Building baking-free bricks and production method thereof
CN103553492A (en) * 2013-10-16 2014-02-05 山东大学 Braking-free brick mainly prepared from polyaluminum chloride waste residues and red mud and preparation method thereof
CN103553492B (en) * 2013-10-16 2016-01-20 山东大学 It is a kind of that with polyaluminium waste slag of aluminum and red mud, to be major ingredient non-burning brick and preparation method thereof
CN103964801A (en) * 2014-02-25 2014-08-06 内蒙古蒙西鄂尔多斯铝业有限公司 Method for preparing baking-free brick or building block by aluminum oxide by-product extracted from coal ash
CN103964801B (en) * 2014-02-25 2016-01-20 内蒙古蒙西鄂尔多斯铝业有限公司 A kind of flyash extraction aluminum oxide by product that utilizes prepares method that is non-burning brick or building block
CN105218064A (en) * 2015-08-24 2016-01-06 昆明理工大学 It is a kind of that to be main material with red mud As polluted soil non-burning brick
CN106986607A (en) * 2017-05-10 2017-07-28 柳州市够旺贸易有限公司 Flyash brick manufacture method
CN107244866A (en) * 2017-05-10 2017-10-13 柳州市够旺贸易有限公司 Flyash brick production technology
CN108191368A (en) * 2018-02-05 2018-06-22 合肥市大卓电力有限责任公司 A kind of environment-friendly baking-free bricks that useless medical gypsum manufacture is recycled using orthopaedics
CN109133890A (en) * 2018-09-28 2019-01-04 佛山齐安建筑科技有限公司 A kind of preparation method of anticorrosive pressure-resisting type bearing bricks
CN109603452A (en) * 2018-12-21 2019-04-12 昆明理工大学 A method of it improving red mud and holds sulfur content and recycling

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