CN101723608A - Method for preparing travertine gelled material - Google Patents
Method for preparing travertine gelled material Download PDFInfo
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- CN101723608A CN101723608A CN200810224376A CN200810224376A CN101723608A CN 101723608 A CN101723608 A CN 101723608A CN 200810224376 A CN200810224376 A CN 200810224376A CN 200810224376 A CN200810224376 A CN 200810224376A CN 101723608 A CN101723608 A CN 101723608A
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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 method for preparing travertine gelled material, belonging to the technical fields of environmental protection and resource integrated utilization. The method comprises: mixing tailings and red mud to be ground into material cakes, material blocks, material balls or material powder which are sent into an alteration reactor for hydrothermal alteration reaction; controlling the temperature of the hydrothermal alteration reaction to be 200-900 DEG C and the reaction time to be 0.6-800min; and mixing and grinding the material pretreated by the hydrothermal alteration reaction, cement clinker, blast furnace water-granulated slag, plaster and diagenetic agent, and obtaining the travertine gelled material. By utilizing salt substances and volatile matter which are contained in the red mud for carrying out hydrothermal alteration on the tailings, the method realizes controlling waste by waste, simultaneously changes the tailings and the red mud into valuables, and reduces the damage for the ecological environment caused by stack of the tailings and the red mud; the produced travertine can be used as high quality cement on multiple occasions, but the production cost of the travertine can be reduced by 20-50% compared with cement; and the load of the environment in the production process is reduced by 50-80% compared with cement.
Description
Technical field
The invention belongs to environment protection and comprehensive utilization of resources technical field, particularly a kind of method for preparing travertine gelled material.
Background technology
Mine tailing is one of solid waste of the present quantum of output maximum of China.Total quantum of output of the present annual mine tailing of China is 600,000,000 tons, and wherein 500,000,000 tons is iron tailings, and all the other are non-ferro metals debris, precious metal mine tailing and nonmetalliferous ore mine tailing.The accumulation volume of cargo in storage of China's mine tailing is 6,000,000,000 tons.Except that the mine tailing of the mine tailing of minority skarn type iron ore and part nonmetalliferous ore, therefore SiO2 and Al2O3 sum belong to high sial system all greater than 50% in the mine tailing of most iron ores and non-ferro metals debris and the precious metal mine tailing.A large amount of tailings impoundment like this, not only occupy a large amount of farmlands, mountains and rivers, brought havoc for environment and ecology, but also can be because mine tailing storehouse overload operation or mismanagement cause dam-break accident, bring massive losses and catastrophic environmental accident to the people's lives and property.Utilize mine tailing to prepare the existing a large amount of patent application of cement class gelling material of high calcium system both at home and abroad.Chinese patent publication number 200310109672 relates to the method that a kind of metal tailings (skarn) is produced cement or cement products, wherein disclose and added in the cement manufacturing that 10～35% metal tailings (skarn) are produced cement as blended material and part replaces the method for manufacture of cement cement products, but still continued the basic manufacturing process of traditional high calcium system cement.Chinese patent publication number 011302336 relates to a kind of Portland clinker, wherein disclosing a kind of is the method that the raw material of the batching of raw material is made cement clinker with Wingdale, iron tailings, flyash, boiler bottom slag, still belongs to a kind of manufacture method of traditional high calcium system silicate cement.Chinese patent publication number 96109194 relates to a kind of recovery method of tailings of iron ore, wherein mine tailing is made FeCO by being calcined to 400～800 ℃
3Be transformed into Fe
3O
4The method of iron is reclaimed in magnetic separation again, simultaneously the CaCO in the mine tailing
3And MgCO
3Be converted to CaO and MgO, kaolinite is transformed into metakaolinite, thereby the remainder after the magnetic separation has hydraulically active, as the raw material of producing cement of low index.This technology of inventing disclosed production cement of low index has been continued to use in traditional cement with the thought of chainotte as active addition of cement.Chinese patent publication number 92106479 relates to and utilizes the copper mine tailing to produce cement clinker, wherein with copper mine tailing 5～9%, Wingdale 71～80%, clay 4.5～6.5%, hard coal 6% is produced cement clinker as the batching of raw material, and wherein the main effect of copper mine tailing is the instead of part clay, and SiO is provided
2, and have certain mineralizer effect, its technological line still to continue to use the technological line of traditional portland high calcium system.
Publication number is that 02158190 patent of invention " coagulating stone dualization wet cement and uses thereof " has been described and adopted big volume waste residue wet method to prepare the method for travertine gelled material, but introduce to adopt earlier and mine tailing and red mud to be mixed and carry out the pretreated technology of hydrothermal alteration, do not comprise that also with mine tailing and red mud be the technology that main material production is coagulated stone.
About 6,000 ten thousand tons of the annual discharging in whole world red mud, the red mud amount that China only discharges in 5 big alumina producer years of middle aluminium company just reaches 4,000,000 tons, and accumulation red mud volume of cargo in storage is up to 5,000 ten thousand tons, and its utilization ratio only is about 15%.Alumina producer mostly is passed to the stockyard with red mud both at home and abroad at present, and the wet method of building a dam is stored up, and separates that by natural subsidence part alkali lye is recycled, and this method easily makes a large amount of waste lyes be penetrated near farmland, causes alkalization of soils, paludification, polluted surface, underground water source.Another kind method is to store up after the red mud drying dehydration, the Pingguo Aluminium Industry Corp of China mainly adopts dry method to store up, though reduced volume of cargo in storage and can increase the height of storing up, but processing cost increases, and still need land occupation, southern simultaneously rainfall is plentiful, also causes the pollution of soil alkalization and water system easily.In a word, red mud is stored up not only needs certain capital cost, and takies a large amount of soils, and contaminate environment, and make the many compositions that utilize in the red mud can not get reasonable utilization causes the secondary waste of resource, serious obstruction the Sustainable development of aluminium industry.
The red mud of China's alumina producer adopts methods such as level land Gao Tai, river valley ponding, lowland filling to store up mostly, does not adopt an effective measure more.Adopt level land Gao Taifa, red mud dump to store up ten thousand t surplus the red mud 1800, height of dam 50m as Shandong Aluminium Industrial Corp.Owing to do not take any seepage control measure, the permeability coefficient of red mud waste liquid is up to 1.22 * 10
-4～5.86 * 10
-5Cm/s, polluted underground water source 200～700m causes the phreatic permanent alkalization in this area, and this area's ecotope has been caused serious destruction, is one " worry " of company and even Zibo City always, has seriously perplexed the Sustainable development of aluminium industry.Therefore, the comprehensive utilization red mud has become problem that needs to be resolved hurrily of aluminum smelting industry.
Though can reclaim high valence elements in theory from red mud, the red mud residue after reclaiming is not if take other to utilize measure, and red mud is stored up the social concern of being brought and still can not alleviated.In order fundamentally to eliminate the harm of red mud, also great deal of experimental has been carried out in other comprehensive utilizations of red mud both at home and abroad.As produce glass, system plastic filler, impervious material, cement, pave the way etc., but the operation of not putting into production mostly at present, the usage quantity of red mud is still very low.
What foreign study was maximum is Bayer process red mud.Because of it contains higher ferric oxide, states such as USSR (Union of Soviet Socialist Republics), Germany, the U.S. and Japan and Hungary all carried out the test of red mud ironmaking.USSR (Union of Soviet Socialist Republics) is that ferriferous raw material is allocated cement slurry into the red mud, proportioning can reach 14%, Mitsui aluminum oxide company cooperates with the cement mill, and cement clinker can utilize red mud 5～20kg/t, and Spain Shandong high oxidation aluminium manufacturer then produces wall tile to Bayer process red mud and flyash and tests.At present, also have many experts to be devoted to mud adsorbent abroad to purifying liquid waste, purify the applied research of hydrogen sulfide waste gas.But because technology and economic benefit aspect, more than research rests on experimental stage more, and Bayer process red mud utilizes level still lower at present.
China is since 1954 build up first alumina producer, and the research that red mud is fully utilized never stopped.Shandong Aluminum Plant has built up the national large-scale cement factory that is intended to fully utilize red mud at the beginning of the sixties, but because alkalinity height in the red mud causes again that after reducing the red mud alkalinity red mud slurry flowing property descends, and fails to be applied to produce so far.
Patent of invention " a kind of method (CN1613809) of utilizing red mud to produce cement " discloses a kind of method of utilizing red mud to produce cement, relate to the method that a kind of discarded red mud that utilizes alumina producing is produced cement, particularly eliminate the hard method of glued knot when storing batching behind the red mud dealkalization.Be included in and adopt atmospheric pressure oxidation calcium aquation method to carry out red mud dealkalization, store batching and conventional production cement process, it is characterized in that the red mud after the dealkalize filtration is cooled to 5 ℃～55 ℃ storage blending processes that enter manufacture of cement again.Adopt the Sulfonates additive to carry out surface treatment.
In a kind of method (CN1613809) of utilizing red mud to produce cement of patent of invention, mention; can prevent effectively that dealkalize red mud and cement raw slurry knot is hard; the amount of allocating into that makes red mud in the cement production process is brought up to more than 50% by present 15%, to the comprehensive utilization and the environment protection of the discarded red mud of aluminum oxide production process and reduce the manufacture of cement cost and play an important role.
It is that main raw material prepares aluminosulfate cement and preparation method thereof with aluminum oxide industry waste residue red mud that patent of invention " a kind of method of preparing sulphate aluminium cement by red mud (CN1837121) " discloses a kind of, its prescription mainly is part aluminium matter, the calcareous raw material that partly replaces conventional aluminosulfate cement production usefulness with 26%～41% red mud, replace siliceous and ferriferous raw material fully, grinding is to certain fineness, by C in the design cement clinker
4A
3S, C
2S, C
4The composition of essential minerals such as AF is through batching preparation aluminosulfate cements such as same bauxitic clay, Wingdale, gypsum.This method prepares aluminosulfate cement, and the direct utilization ratio height of red mud does not need to improve traditional aluminosulfate cement production technique, and the grog burn-ability is good, and setting rate is fast, the early strength height, and later strength is also promoted stable.Performance test shows that the aluminosulfate cement mechanical strength that utilizes red mud to prepare is better than the quick hardening sulphoaluminate cement of commercially available 425 labels.
The method of hydrothermal alteration is invented according to hydrothermal alteration action principle in the geologic function, in geologic process hydrothermal alteration ubiquitous, be the most important effect that mineral composition changes in the earth's crust.Hydrothermal alteration on the fugitive constituent group just deviate from have strong polarity, advantage of high activity in a flash, act on the mineral grain surface, lattice surface is acutely destroyed, scission of link increases, reactive behavior improves, for subsequently corrosion, depolymerization, migration lays the first stone.The intensity of this hydrothermal alteration can also increase substantially under the compound synergistic effect effect of many components salt.
Summary of the invention
The purpose of this invention is to provide a kind of method for preparing travertine gelled material, it is characterized in that, this method preparation process is,
(1) prepares mixture, by weight percentage 60～90% mine tailing and 10～40% red mud are mixed together, mixed mode is wet mixing or does and mix, when adopting the wet mixing pattern, pug should carry out the forced dehydration processing after going out mill, control its water ratio 0.1～20%, the finish mix cake of pug after will dewatering then, material piece, pellet or material powder are sent into and are carried out the hydrothermal alteration reaction in the alteration reactor; When adopt to do mixing pattern, gained dry powder is added the water that accounts for mixture weight 0.1～10%, finish mix cake, material piece, pellet or material powder;
(2) mixed material carries out the hydrothermal alteration reaction in high-temperature reactor, and the temperature of hydrothermal alteration reaction is 200～900 ℃, and the time of reaction is 0.6～800min;
(3) will react pretreated material 50～90%, cement clinker 0.1～29%, blast furnace slag 0～30%, gypsum 0～8%, rock forming agent 0.1～5% mixed grinding through hydrothermal alteration by weight percentage, it is 380～780m that the final blending material should be ground to specific surface area
2/ kg obtains travertine gelled material.
Described mixing equipment used is ball mill or forced mixer, when adopting ball mill as mixing equipment, and material size≤2000 μ m, discharging-material size≤100 μ m, when adopting forced mixer as mixing equipment, material size≤100 μ m, the time is 10～200min.
Described high-temperature reactor is continous way kiln or periodic kilns the kiln, for rotary kiln or tunnel kiln, chain furnace, drawer kiln, shuttle kiln or the bed of material are the heated kiln of fluidized.
Described gypsum comprises natural dehydrated gyp-, dihydrate gypsum, desulfurated plaster, phosphogypsum or contain CaSO
4Trade waste.
Described rock forming agent coagulates the prescription that stone A rock forming agent is used for cement clinker volume 〉=5% for coagulating stone A rock forming agent or coagulating stone C rock forming agent, coagulates the prescription that stone C rock forming agent is used for cement clinker volume＜5%.
Beneficial effect of the present invention is:
1. utilize salts substances contained in the red mud and fugitive constituent that mine tailing is carried out hydrothermal alteration, realize the treatment of wastes with processes of wastes against one another, mine tailing and red mud are turned waste into wealth simultaneously, alleviate mine tailing and red mud and pile up the destruction that ecotope is caused;
2. the stone of being produced with fixed attention can be used as cement of high index in a lot of occasions and uses, but its production cost can reduce by 20～50% than producing cement;
3. production process reduces 50～80% to the comparable production cement of the load of environment.
Embodiment
The present invention utilizes and contains a large amount of NaCl, NaOH, 2CaO.SiO in the red mud
2.nH
2O, CaOCO
3, Ca (OH)
2Deng, with red mud and mine tailing mixing post-heating, make the multiple fugitive constituent in the red mud form hydrothermal alteration, and red mud quilt itself is from alteration to the mine tailing surface.Carry out to use mine tailing and red mud (can reach more than 70%) by vast scale after the pre-treatment, mix (below 30%) or not water mixing mud grog less, produce travertine gelled material with cement of high index performance.
The invention will be further described below in conjunction with accompanying drawing:
Embodiment 1
A kind of method for preparing travertine gelled material, this method preparation process be,
(1) prepares mixture, by weight percentage 60% mine tailing and 40% red mud are mixed together, mine tailing granularity≤100 μ m, red mud granularity≤100 μ m, the mixing equipment used is a forced mixer, and mixed mode mixes for doing, and the time is 100min, with the water of gained mixed powder adding 6%, finish mix.
(2) mixed material piece carries out the hydrothermal alteration reaction in tunnel furnace, and the temperature of hydrothermal alteration reaction is 750 ℃, and the time of reaction is 200min;
(3) will react pretreated material 65%, cement clinker 0.1%, blast furnace slag 30% through hydrothermal alteration by weight percentage, coagulate stone C rock forming agent (supporting Science and Technology Ltd. available from indigo plant) 4.9% mixed grinding, the final blending material should be ground to specific surface area 540m
2/ kg obtains travertine gelled material.
Resultant mixed powder can be used as the travertine gelled material finished product after homogenizing and check, this material carries out intensity by the GB175-1999 standard and stability detects, and ultimate compression strength is 21.8MPa in the time of 3 days, is 53.1Mpa in the time of 28 days; Folding strength is 4.9MPa in the time of 3 days, is 9.2MPa in the time of 28 days; It is qualified that stability is in 3 days and 28 days test.
Embodiment 2
A kind of method for preparing travertine gelled material, this method preparation process be,
(1) prepares mixture, by weight percentage 70% golden mine tailing and 30% red mud are mixed together, gold mine tailing granularity≤800 μ m, red mud granularity≤1000 μ m, wet method mix grinding 50min in ball mill, mud after the wet-milling is carried out processed, control its water ratio 10%, the pug after will dewatering is then made pellet;
(2) mixed pellet carries out the hydrothermal alteration reaction in rotary kiln, and the temperature of hydrothermal alteration reaction is 800 ℃, and the time of reaction is 56min;
(3) will react pretreated material 69%, cement clinker 10%, blast furnace slag 15%, natural dehydrated gyp-5% through hydrothermal alteration by weight percentage, (available from the indigo plant money Science and Technology Ltd.) 1% of coagulating stone A rock forming agent, with blast furnace slag and cement clinker and coagulate stone A rock forming agent and be mixed together and be milled to specific surface area 390m in advance
2/ kg arrives specific surface area 580m2/kg with mixture and natural dihydrate gypsum mix grinding through the hydrothermal alteration reaction again, obtains travertine gelled material.
Resultant mixed powder can be used as the travertine gelled material finished product after homogenizing and check, this material carries out intensity by the GB175-1999 standard and stability detects, ultimate compression strength is 26.1MPa in the time of 3 days, in the time of 28 days 51.2MPa, folding strength is 4.1MPa in the time of 3 days, be 8.9MPa in the time of 28 days, it is qualified that stability is in 3 days and 28 days test.
Embodiment 3
A kind of method for preparing travertine gelled material, this method preparation process be,
(1) prepares mixture, by weight percentage copper mine tailing 85% and red mud 15% are mixed together, gold mine tailing granularity≤300 μ m, red mud granularity≤1500 μ m, wet method mix grinding 100min in ball mill, mud after the wet-milling is carried out processed, control its water ratio, the finish mix powder of pug after will dewatering then 2%;
(2) mixed material powder carries out the hydrothermal alteration reaction in cyclone type powder reactor (bed of material be in the heated kiln of fluidized a kind of), and the temperature of hydrothermal alteration reaction is 800 ℃, and the time of reaction is 1min;
(3) will react pretreated material 65%, cement clinker 10%, blast furnace slag 15%, phosphogypsum 9% through hydrothermal alteration by weight percentage, (available from indigo plant money Science and Technology Ltd.) 1% mixed grinding that coagulates stone A rock forming agent, with blast furnace slag, cement clinker, coagulate stone A rock forming agent and be mixed together and be milled to specific surface area 390m in advance
2/ kg arrives specific surface area 580m with mixture, phosphogypsum mix grinding through the alteration reaction again
2/ kg obtains travertine gelled material.
Resultant mixed powder can be used as the travertine gelled material finished product after homogenizing and check, this material carries out intensity by the GB175-1999 standard and stability detects, ultimate compression strength is 25.5MPa in the time of 3 days, in the time of 28 days 50.2MPa, folding strength is 4.8MPa in the time of 3 days, be 8.9MPa in the time of 28 days, it is qualified that stability is in 3 days and 28 days test.
Embodiment 4
A kind of method for preparing travertine gelled material, this method preparation process be,
(1) prepares mixture, by weight percentage the mine tailing of 75% appositional pattern rhombohedral iron ore and 25% red mud are mixed together, the mine tailing granularity of appositional pattern rhombohedral iron ore is≤300 μ m, the red mud granularity is≤100 μ m, wet method mix grinding 20min in ball mill, mud after the wet-milling is carried out processed, control its water ratio, finish mix of the pug after will dewatering then 8%;
(2) mixed material piece carries out the hydrothermal alteration reaction in tunnel furnace, and the temperature of hydrothermal alteration reaction is 720 ℃, and the time of reaction is 700min;
(3) will react pretreated material 79%, cement clinker 0.2%, blast furnace slag 16% through hydrothermal alteration by weight percentage, (available from the indigo plant money Science and Technology Ltd.) 4.8% of coagulating stone C rock forming agent together mix grinding to specific surface area 530m
2/ kg obtains travertine gelled material.
Resultant mixed powder can be used as the travertine gelled material finished product after homogenizing and check, this material carries out intensity by the GB175-1999 standard and stability detects, ultimate compression strength is 21.5MPa in the time of 3 days, in the time of 28 days 46.1MPa, folding strength is 4.0MPa in the time of 3 days, be 8.7MPa in the time of 28 days, it is qualified that stability is in 3 days and 28 days test.
Claims (5)
1. a method for preparing travertine gelled material is characterized in that, this method preparation process is,
(1) prepares mixture, by weight percentage 60～90% mine tailing and 10～40% red mud are mixed together, mixed mode is wet mixing or does and mix, when adopting the wet mixing pattern, pug should carry out the forced dehydration processing after going out mill, control its water ratio 0.1～20%, the finish mix cake of pug after will dewatering then, material piece, pellet or material powder are sent into and are carried out the hydrothermal alteration reaction in the alteration reactor; When adopt to do mixing pattern, gained dry powder is added the water that accounts for mixture weight 0.1～10%, finish mix cake, material piece, pellet or material powder;
(2) mixed material carries out the hydrothermal alteration reaction in high-temperature reactor, and the temperature of hydrothermal alteration reaction is 200～900 ℃, and the time of reaction is 0.6～800min;
(3) will react pretreated material 50～90%, cement clinker 0.1～29%, blast furnace slag 0～30%, gypsum 0～8%, rock forming agent 0.1～5% mixed grinding through hydrothermal alteration by weight percentage, it is 380～780m that the final blending material should be ground to specific surface area
2/ kg obtains travertine gelled material.
2. a kind of method for preparing travertine gelled material according to claim 1, it is characterized in that, described mixing equipment used is ball mill or forced mixer, when adopting ball mill as mixing equipment, material size≤2000 μ m, discharging-material size≤100 μ m is when adopting forced mixer as mixing equipment, material size≤100 μ m, the time is 10～200min.
3. a kind of method for preparing travertine gelled material according to claim 1, it is characterized in that, described high-temperature reactor is continous way kiln or periodic kilns the kiln, for rotary kiln or tunnel kiln, chain furnace, drawer kiln, shuttle kiln or the bed of material are the heated kiln of fluidized.
4. a kind of method for preparing travertine gelled material according to claim 1 is characterized in that described gypsum comprises natural dehydrated gyp-, dihydrate gypsum, desulfurated plaster, phosphogypsum or contain CaSO
4Trade waste.
5. a kind of method for preparing travertine gelled material according to claim 1, it is characterized in that, described rock forming agent coagulates the prescription that stone A rock forming agent is used for cement clinker volume 〉=5% for coagulating stone A rock forming agent or coagulating stone C rock forming agent, coagulates the prescription that stone C rock forming agent is used for cement clinker volume＜5%.
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Family
ID=42445256
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101973748A (en) * | 2010-09-30 | 2011-02-16 | 洛阳龙门煤业有限公司 | Mine roadway red mud guniting material and preparation method thereof |
| CN103964717A (en) * | 2014-04-22 | 2014-08-06 | 武汉理工大学 | Iron tailings activity improvement method, prepared iron tailings and application |
| CN104844023A (en) * | 2015-04-29 | 2015-08-19 | 重庆大学 | Method for manufacturing mine filling material by curing copper tailing using iron tailing |
| CN107139325A (en) * | 2017-06-26 | 2017-09-08 | 洛阳理工学院 | A kind of method that wet grinding cement prepares ready-mixed concrete |
| CN111470751A (en) * | 2020-04-26 | 2020-07-31 | 虞克夫 | Dredged sludge curing agent, preparation method and use method |
| CN111847921A (en) * | 2020-07-06 | 2020-10-30 | 广州大学 | Low clinker cement and preparation method and application thereof |
| CN111875303A (en) * | 2020-07-23 | 2020-11-03 | 虞克夫 | Gold tailing curing agent, preparation method and use method |
-
2008
- 2008-10-20 CN CN200810224376A patent/CN101723608A/en active Pending
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101973748A (en) * | 2010-09-30 | 2011-02-16 | 洛阳龙门煤业有限公司 | Mine roadway red mud guniting material and preparation method thereof |
| CN103964717A (en) * | 2014-04-22 | 2014-08-06 | 武汉理工大学 | Iron tailings activity improvement method, prepared iron tailings and application |
| CN103964717B (en) * | 2014-04-22 | 2016-07-06 | 武汉理工大学 | The raising method of iron tailings activity, the iron tailings of gained and application |
| CN104844023A (en) * | 2015-04-29 | 2015-08-19 | 重庆大学 | Method for manufacturing mine filling material by curing copper tailing using iron tailing |
| CN107139325A (en) * | 2017-06-26 | 2017-09-08 | 洛阳理工学院 | A kind of method that wet grinding cement prepares ready-mixed concrete |
| CN111470751A (en) * | 2020-04-26 | 2020-07-31 | 虞克夫 | Dredged sludge curing agent, preparation method and use method |
| CN111847921A (en) * | 2020-07-06 | 2020-10-30 | 广州大学 | Low clinker cement and preparation method and application thereof |
| CN111847921B (en) * | 2020-07-06 | 2021-11-02 | 广州大学 | Low clinker cement and preparation method and application thereof |
| CN111875303A (en) * | 2020-07-23 | 2020-11-03 | 虞克夫 | Gold tailing curing agent, preparation method and use method |
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