CN107162445A - A kind of method that portland cement is prepared by carbide slag and copper ashes melting slag - Google Patents

A kind of method that portland cement is prepared by carbide slag and copper ashes melting slag Download PDF

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Publication number
CN107162445A
CN107162445A CN201710340757.9A CN201710340757A CN107162445A CN 107162445 A CN107162445 A CN 107162445A CN 201710340757 A CN201710340757 A CN 201710340757A CN 107162445 A CN107162445 A CN 107162445A
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CN
China
Prior art keywords
slag
carbide slag
copper ashes
portland cement
ashes melting
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Pending
Application number
CN201710340757.9A
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Chinese (zh)
Inventor
孙辉
边妙莲
马冬阳
陈士朝
吴道洪
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Shenwu Technology Group Corp Co Ltd
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Shenwu Technology Group Corp Co Ltd
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Priority to CN201710340757.9A priority Critical patent/CN107162445A/en
Publication of CN107162445A publication Critical patent/CN107162445A/en
Pending legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/14—Cements containing slag
    • C04B7/147—Metallurgical slag
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/24—Cements from oil shales, residues or waste other than slag
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
    • C04B7/40—Dehydrating; Forming, e.g. granulating
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B7/00—Hydraulic cements
    • C04B7/36—Manufacture of hydraulic cements in general
    • C04B7/48—Clinker treatment
    • C04B7/52—Grinding ; After-treatment of ground cement
    • 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
    • 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
    • Y02P40/121—Energy efficiency measures, e.g. improving or optimising the production methods

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

The present invention relates to a kind of method for preparing portland cement by carbide slag and copper ashes melting slag, this method comprises the following steps：Carbide slag is dehydrated outside rotary kiln；Copper ashes melting slag, sandstone and carbide slag are carried out to be mixed into compound；Compound is extruded, using dry grinding dry combustion method technique calcine obtaining clinker after grinding, clinker and retarder combined grinding are obtained into portland cement.The carbide slag and copper ashes melting slag of the present invention prepares in the method for portland cement carbide slag 100% substituting lime stone production clinker, has saved the exploitation of limestone resource, has reduced the discharge of greenhouse gases.

Description

A kind of method that portland cement is prepared by carbide slag and copper ashes melting slag
Technical field
The present invention relates to a kind of method for preparing portland cement by carbide slag and copper ashes melting slag.
Background technology
Carbide slag is the residue after calcium carbide hydrolysis, and main component is Ca (OH)2.By 2015, the whole nation about produced 25,000,000 Ton calcium carbide, about produces 1.2~1.5 tons of carbide slag calculating, can produce carbide slag about 3000~37,500,000 after being hydrolyzed by calcium carbide per ton Ton.Therefore, China's accumulation calcium carbide quantity of slag crosses hundred million tons, is stacked and not only occupies a large amount of soils, and in carbide slag slurry Moisture penetration enters in underground water, the problems such as causing soil alkalization and water resource pollution.Carbide slag is stacked through long-time to be air-dried Easily play airborne dust to the wind afterwards, great threat is brought to surrounding environment.
But, carbide slag is both a kind of industrial solid castoff, is also a kind of secondary resource, if it is possible to by effective profit With then the development to society, economy and environment is of great advantage.At present, comprehensive utilization of the China to carbide slag has carried out many-side Research, the desulfurizing agent of carbide slag as coal-burning power plant's waste gas for example can be produced into desulfurated plaster, with carbide slag produce nanometer Calcium carbonate is used as soil conditioner to improve acid soil etc..
Production clinker is mainly made up of calcareous corrigent, siliceous corrigent, aluminum corrigent and irony corrigent.It is logical Often, calcareous corrigent is mainly limestone resource.It is pre- by entering nsp kiln after above-mentioned raw materials are mixed and finely ground according to proportioning Enter rotary kiln after thermal decomposition calcine obtaining clinker, be mixed and finely ground afterwards with retarder, that is, obtain cement products.Using Lime stone is that calcareous corrigent has decomposition temperature height, and raw material enters calcined by rotary kiln life after need in advance being thermally decomposed through five-stage whirlwind Into clinker, process energy consumption is high.
It is only to carry out clinker production using carbide slag and limestone mix in the prior art, not by calcium carbide Slag replacing whole limestone, nsp kiln still needs the technique for preparing clinker according to lime stone and is designed, not Embody the energy-saving effect after carbide slag is added.In addition, in the prior art or clay is added as siliceous corrigent, but clay Resource-constrained, formation time are longer and necessary to being crop growth, thus substituted with other siliceous corrigents it is imperative.
Accordingly, it would be desirable to a kind of production method of new portland cement, it can overcome the disadvantage that lime stone is raw band Disease have found the siliceous corrigent of other replacements again.
The content of the invention
In view of the above-mentioned problems, preparing portland cement by carbide slag and copper ashes melting slag it is an object of the invention to provide one kind Method.
To reach above-mentioned purpose, the present invention is adopted the following technical scheme that：
According to the present invention there is provided a kind of method for preparing portland cement by carbide slag and copper ashes melting slag, including it is following Step：
Step one：Carbide slag is dehydrated outside rotary kiln；
Step 2：The carbide slag handled by copper ashes melting slag, sandstone and by step one carries out being mixed to form compound；
Step 3：Water is obtained by being handled after the compound extruding in step 2, grinding using dry grinding dry combustion method technique progress Mud clinker；
Step 4：Grinding obtains portland cement after clinker after burning till is mixed with retarder.
Further, the dry grinding dry combustion method technique in step 3 comprises the following steps：
1) waste heat in the waste gas discharged using rotary kiln and/or dore furnace is preheated to compound；
2) compound after preheating is subjected to burning till for clinker in rotary kiln.
Further, the addition of retarder is the 3-5% of clinker gross mass.
Further, the chemical component weight percentage of the carbide slag in step one is：CaO 65-71wt%, chlorion Not higher than 0.05wt%, iron silicides are not higher than 0.06wt%.It is preferred that, CaO 66.73-69.23wt%, chlorion 0.01-0.03wt%, iron silicides 0.03-0.05wt%.
Further, the chemical component weight percentage of the copper ashes melting slag in step 2 is：CaO 20-23wt%, SiO246-50wt%, Al2O39-12wt%, Fe2O35-11wt%, MgO 6-9wt%.It is preferred that, CaO 21.43- 22.02wt%, SiO247.34-48.15wt%, Al2O310.09-11.22wt%, Fe2O36.01-9.99wt%, MgO 7.23-7.99wt%.
Further, the chemical component weight percentage of the sandstone in step 2 is SiO286-92wt%.It is preferred that, SiO287.48-89.47wt%.
Further, the carbide slag that copper ashes melting slag, sandstone and process step one are handled in step 2 is according to following weight Number is mixed：Copper ashes melting slag 30.0-31.5 parts by weight, sandstone 2.9-3.4 parts by weight, carbide slag 65.2-67.9 weight Part.
Preferably, the carbide slag that copper ashes melting slag, sandstone and process step one are handled in step 2 is according to following parts by weight Number is mixed：Copper ashes melting slag 30.2-31.2 parts by weight, sandstone 3.0-3.3 parts by weight, carbide slag 65.4-66.7 parts by weight.
It is further preferred that the carbide slag that copper ashes melting slag, sandstone and process step one are handled in step 2 is according to following Parts by weight are mixed：Copper ashes melting slag 30.31-31.14 parts by weight, sandstone 3.03-3.25 parts by weight, carbide slag 65.61- 66.54 parts by weight.
Further, carbide slag is dehydrated to water content in step one and is less than 1%.
Further, the particle diameter in step 3 after compound grinding be less than more than 80 μm of particle account for the 90% of gross mass with On.
Further, the calcining heat for dry combustion method technique of being dry grinded in step 3 is 1350 DEG C -1400 DEG C, and calcination time is 26- 37min。
Preferably, dry combustion method technique calcining heat of being dry grinded in step 3 is 1360 DEG C -1390 DEG C, and calcination time is 28- 35min。
Further, retarder is the natural gypsum, the one or two of desulfurated plaster.
Further, copper ashes melting slag refers to copper ashes after being reduced directly through rotary hearth furnace after slag sluicing system during molten point Obtained solid waste.
The beneficial effects of the invention are as follows：
1) due to containing abundant CaO, the calcareous corrigent in being produced as clinker in carbide slag.The present invention's Carbide slag prepares in the method for portland cement carbide slag 100% substituting lime stone production clinker, has saved lime stone The exploitation of resource, reduces the discharge of greenhouse gases.In addition, decomposition temperature of limestone is 850 degrees Celsius, and Ca in carbide slag (OH)2Decomposition temperature is only 580 degrees Celsius.Therefore, lime stone is substituted using carbide slag and prepares portland cement, energy can be reduced Consumption, improves production efficiency.In addition, copper ashes melting slag is substituted to clay as siliceous corrigent, the system applied to portland cement It is standby, improve copper ashes melting slag resource utilization rate and reduce the usage amount of clay, overcome conventional limestone and prepare silicon Acid salt cement and prepare the problem of portland cement related process is present using carbide slag.
2) due in carbide slag chloride ion content it is low (be less than 0.06%), revolution kiln tail is caused by primary raw material of carbide slag Gas outlet knot chlorine phenomenon is lighter, can realize that rotary kiln is continuously produced.
3) due in carbide slag ferrosilicon content it is low, saved initial mixing feed powder mill and cement grog grinding process time, Equipment attrition rate is relatively low.
Brief description of the drawings
Fig. 1 is the method flow diagram that the present invention is prepared portland cement by carbide slag and copper ashes melting slag.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, below in conjunction with the accompanying drawings and embodiment, it is right The present invention is further elaborated.It should be appreciated that specific embodiment described herein is only to explain the present invention, not For limiting the present invention.
Embodiment 1
In the present embodiment, the chemical composition of copper ashes melting slag, sandstone and carbide slag is as shown in table 1.
As shown in figure 1, in step S101, carbide slag is dehydrated outside rotary kiln, drying is aqueous to carbide slag Amount is less than 1%.In step s 102, by 30.00 parts by weight copper ashes melting slags, the sandstone of 3.09 parts by weight and 67.9 parts by weight Dried carbide slag carries out being mixed into compound；In step s 103, compound is extruded, grinding, final compound grinding Reach that particle of the particle diameter less than more than 80um accounts for more than the 90% of gross mass afterwards.In step S104, using dry grinding dry combustion method technique Calcined, dry grinding dry combustion method technique pre- thermal decomposition process uses three-level whirlwind preheating decomposition system, dry grinding dry combustion method technique include with Lower step：
1) waste heat in the waste gas discharged using rotary kiln and/or dore furnace is thermally decomposed in advance to compound, makes mixing Material preheating and part Ca (OH)2Decompose；
2) compound after preheating is subjected to burning till for clinker, Ca (OH) in rotary kiln in rotary kiln2Enter one Step is decomposed and occurs solid phase reaction, the various mineral needed for generation clinker.
Dry combustion method technique of dry grinding calcining heat is 1400 DEG C, and calcination time is 26 minutes.
In step S105, it will be added in the clinker after burning till and account for the natural gypsum that gross mass ratio is 3% as slow Solidifying agent, grinding prepares Portland cement production to suitable fineness after mixing.
The copper ashes melting slag of table 1, sandstone and carbide slag chemical composition, wt%
Embodiment 2
In the present embodiment, the chemical composition of copper ashes melting slag, sandstone and carbide slag is as shown in table 2.
As shown in figure 1, preparing portland cement using the method for embodiment 1.Copper ashes melting slag, sandstone and carbide slag according to Following percentage by weight is mixed：The parts by weight of copper ashes melting slag 31.5, the parts by weight of sandstone 3.4, the parts by weight of carbide slag 65.2；Adopt With dry grinding dry combustion method technique calcine and obtain clinker, calcining heat is 1350 DEG C, calcination time is 37 minutes.After burning till Clinker in add and account for the natural gypsum that gross mass ratio is 5% as retarder, grinding is to suitable fineness after mixing, system It is standby to obtain Portland cement production.
The copper ashes melting slag of table 2, sandstone and carbide slag chemical composition, wt%
Embodiment 3
In the present embodiment, the chemical composition of copper ashes melting slag, sandstone and carbide slag is as shown in table 3.
As shown in figure 1, preparing portland cement using the method for embodiment 1, difference is：Copper ashes melting slag, sandstone and Carbide slag is mixed according to following percentage by weight：The parts by weight of copper ashes melting slag 30.74, the parts by weight of sandstone 2.9, carbide slag 66.33 parts by weight；Calcine obtaining clinker using dry grinding dry combustion method technique, calcining heat is 1380 DEG C, calcination time is 33 minutes.By in the clinker after burning till add account for gross mass ratio be 4% the natural gypsum and desulfurated plaster mixture (my god Right gypsum：Desulfurated plaster ratio is 1: 1) as retarder, grinding prepares portland cement production to suitable fineness after mixing Product.
The chemical composition of the copper ashes melting slag of table 3, sandstone and carbide slag, wt%
Comparative example
The portland cement prepared using the common method in this area, wherein retarder are the natural gypsum, and addition is to account for The gross mass ratio of clinker is 3%.
LOI wherein in embodiments of the invention represents loss on ignition, and iron silicides are the different valence state formed under high temperature Iron silicides, i.e. FexSiy。
The related physicochemical property testing result of portland cement prepared by embodiment 1-3 is as shown in table 4.
The technological parameter and testing result of portland cement prepared by the present invention of table 4
As can be seen from Table 4, the silicic acid that the portland cement prepared using the method for the present invention is prepared with conventional method The similar nature of salt cement, and it is better than portland cement prepared by conventional method in the many-side such as compression strength.The present invention Using three-level whirlwind preheating decomposition system, and five-stage whirlwind preheating decomposition system is used in conventional cement preparation method, therefore this Invention reduces energy consumption.
The foregoing is only presently preferred embodiments of the present invention, not for limit the present invention practical range；If do not taken off From the spirit and scope of the present invention, the present invention is modified or equivalent substitution, all should covered in the claims in the present invention Among protection domain.

Claims (10)

1. a kind of method that portland cement is prepared by carbide slag and copper ashes melting slag, it is characterised in that comprise the following steps：
Step one：Carbide slag is dehydrated outside rotary kiln；
Step 2：The carbide slag handled by copper ashes melting slag, sandstone and by step one carries out being mixed to form compound；
Step 3：Handle using dry grinding dry combustion method technique progress that to obtain cement ripe by the compound extruding in step 2, after grinding Material；
Step 4：Grinding obtains portland cement after clinker after burning till is mixed with retarder.
2. the method according to claim 1 that portland cement is prepared by carbide slag and copper ashes melting slag, it is characterised in that Dry grinding dry combustion method technique in the step 3 comprises the following steps：
1) waste heat in the waste gas discharged using rotary kiln and/or dore furnace is preheated to compound；
2) compound after preheating is subjected to burning till for clinker in rotary kiln.
3. the method according to claim 1 that portland cement is prepared by carbide slag and copper ashes melting slag, it is characterised in that The addition of the retarder is the 3-5% of clinker gross mass.
4. the method according to claim 1 that portland cement is prepared by carbide slag and copper ashes melting slag, it is characterised in that The chemical component weight percentage of carbide slag in the step one is：CaO65-71wt%, chlorion is not higher than 0.05wt%, Iron silicides are not higher than 0.06wt%.
5. the method according to claim 1 that portland cement is prepared by carbide slag and copper ashes melting slag, it is characterised in that The chemical component weight percentage of copper ashes melting slag in the step 2 is：：CaO 20-23wt%, SiO246-50wt%, Al2O39-12wt%, Fe2O35-11wt%, MgO 6-9wt%.
6. the method according to claim 1 that portland cement is prepared by carbide slag and copper ashes melting slag, it is characterised in that The chemical component weight percentage of sandstone in the step 2 is SiO286-92wt%.
7. the method according to claim 1 that portland cement is prepared by carbide slag and copper ashes melting slag, it is characterised in that Copper ashes melting slag, sandstone and the carbide slag handled by step one are mixed according to following parts by weight in the step 2： Copper ashes melting slag 30.0-31.5 parts by weight, sandstone 2.9-3.4 parts by weight, carbide slag 65.2-67.9 parts by weight.
8. the method according to claim 1 that portland cement is prepared by carbide slag and copper ashes melting slag, it is characterised in that Carbide slag is dehydrated to water content in the step one and is less than 1%.
9. the method according to claim 1 that portland cement is prepared by carbide slag and copper ashes melting slag, it is characterised in that The particle that particle diameter in the step 3 after compound grinding is less than more than 80 μm accounts for more than the 90% of gross mass.
10. the method according to claim 1 for preparing portland cement by carbide slag and copper ashes melting slag, its feature exists In the calcining heat for dry combustion method technique of being dry grinded in the step 3 is 1350 DEG C -1400 DEG C, and calcination time is 26-37min.
CN201710340757.9A 2017-05-12 2017-05-12 A kind of method that portland cement is prepared by carbide slag and copper ashes melting slag Pending CN107162445A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114477803A (en) * 2022-01-26 2022-05-13 宁夏金昱元资源循环有限公司 Production method of carbide slag cement

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114477803A (en) * 2022-01-26 2022-05-13 宁夏金昱元资源循环有限公司 Production method of carbide slag cement

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