CN110986577A - Method for cooperatively treating electrolytic manganese slag by using dry-process rotary kiln cement plant production line - Google Patents
Method for cooperatively treating electrolytic manganese slag by using dry-process rotary kiln cement plant production line Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/36—Arrangements of air or gas supply devices
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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
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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
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/43—Heat treatment, e.g. precalcining, burning, melting; Cooling
- C04B7/44—Burning; Melting
- C04B7/4492—Inhibiting the formation of or eliminating incrustations in the cement kiln
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23G—CREMATION FURNACES; CONSUMING WASTE PRODUCTS BY COMBUSTION
- F23G5/00—Incineration of waste; Incinerator constructions; Details, accessories or control therefor
- F23G5/02—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment
- F23G5/027—Incineration of waste; Incinerator constructions; Details, accessories or control therefor with pretreatment pyrolising or gasifying stage
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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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
In the normally running dry rotary kiln cement production line, the electrolytic manganese slag is continuously fed into a kiln tail smoke chamber in dry rotary kiln production line equipment, and meanwhile, the oxidizing atmosphere calcination and kiln tail fan air draft in a rotary kiln are controlled to maintain the normal calcination of clinker in the kiln and the stable running of the rotary kiln cement production line. The method has the advantages of simple operation, less technical improvement investment, larger manganese slag disposal amount, no secondary pollution, full resource utilization of the original electrolytic manganese slag and the piled or abandoned electrolytic manganese slag, and contribution to protecting social ecological environment and natural environment.
Description
Technical Field
The invention relates to a method for processing electrolytic manganese residues, in particular to a method for cooperatively processing electrolytic manganese residues by a dry-process rotary kiln cement plant production line.
Background
At present, the electrolytic manganese production capacity in China is over 200 million tons, the acid leaching waste residue discharged by each 1 ton of electrolytic manganese is produced is 5-7 tons, the residue produced by each ton of electrolytic manganese of lower grade raw materials can reach 10 tons, the actual annual stacking or burying amount reaches hundreds of millions of tons, and the new annual increment reaches thousands of tons.
The components and properties of the electrolytic manganese slag are different due to the differences of ore raw material components, acid leaching specific processes and the like. Most of the manganese slag is black, and the minority of the manganese slag is brown gray, and the manganese slag is in a cake shape after being filter-pressed, gradually dispersed after being warehoused and stockpiled, and becomes pasty after absorbing water during rainfall. Due to the limitation of the filter pressing process and the water holding capacity of the manganese slag, the water content of the dehydrated fresh manganese slag still reaches 27-30 percent, and the solution mainly comprises MnSO with the concentration of about 35g/L4、100g/L (NH4)2SO4、25g/L MgSO4And the like. The acid leaching waste residue is a paste substance which is fine and is generally fine black particles, the mass distribution of the particles is generally 31-36% of less than 15 mu m, 45-50% of 15-30 mu m, 4-6% of 30-45 mu m, 1.5-3% of 45-60 mu m, 3.5-6% of 60-80 mu m, 1% of 80-100 mu m and 24-8% of more than 100 mu m, and the particle size of the particles in the residue is mainly concentrated in 3-30 mu m and is about more than 70%. The average particle size of the powder is smaller than that of raw cement powder, the water retention is good, the water content is high, the drying and dehydration are difficult, and volatile gases such as ammonia and the like are discharged in the drying process. The chemical components of the dried electrolytic manganese slag mainly comprise 9-14% of loss on ignition and SiO222～35%、Al2O36～12%、Fe2O35～12%、CaO6～18%、MgO 1～4%、MnO 2～5%、SO320～37%、K2O 0.8～2%、Na20.2-1% of O and a small amount of lead, zinc, cadmium, cobalt and the like; the main mineral components are sulfate (mainly dihydrate gypsum) and SiO2(Quartz), 2 CaO. SiO2·2H2O（C2SH2) And Fe2O3Etc. in which SO3The conversion of 20-37% is that the gypsum accounts for more than 45% (if the CaO content is high), namely the electrolytic manganese slag is chemical gypsum or sulfate waste slag which is an industrial byproduct of lower grade.
Because the electrolytic manganese slag particles are fine and contain a large amount of sulfate radicals, ammonia nitrogen and a certain amount of heavy metal harmful elements, the surface water, the underground water and the soil are seriously polluted by discharging the electrolytic manganese slag, and the ecological environment is seriously influenced. Therefore, a great deal of research and practice is carried out on the disposal and utilization of the manganese slag at home and abroad. The comprehensive utilization of manganese slag in foreign countries mainly focuses on the production of cement by using manganese slag as a ingredient and the partial replacement of manganese slag as retarder gypsum in cement production. Since the 90 s in China, dozens of college and university research institutes and almost all electrolytic manganese enterprises develop series of research and practice of manganese slag utilization, and the existing research results can be summarized as follows:
(1) for cement production or as admixture: typically, as disclosed in chinese patent CN1837120A, a method for producing cement by using electrolytic manganese slag is disclosed, which comprises the steps of mixing 63-63.5% of limestone, 19-19.5% of electrolytic manganese slag, 1.5-2% of iron powder, 1.3-1.8% of fluorite and 13.2-13.7% of anthracite, grinding into raw meal, pelletizing and roasting into clinker, wherein the raw meal is a normal common silicate clinker production ingredient, and the electrolytic manganese slag has low consumption, high coal consumption, high cost, low cement quality and low stability; CN101948254A discloses a preparation method of electrolytic manganese slag ecological cement, which is to grind 10-50% of electrolytic manganese slag, 10-50% of ironmaking blast furnace slag, 10-50% of clinker, 0-20% of fly ash or steel slag, 3-7% of gypsum and additives (potassium carbonate, sodium chloride, calcium chloride, sodium sulfate and the like) after calcination at 500-900 ℃ until the specific surface area is 360-580 m2The electrolytic manganese slag ecological cement is prepared from/kg, a large amount of clinker, slag and the like are required to be adopted in the method, the economy is extremely poor, and no industrial practicability is realized; CN102167533A discloses a manganese slag composite activated and modified slag cement admixture and a preparation method thereof, which is prepared by drying and ultrafine grinding the admixture to a specific surface area of more than 13m2Per g (much higher than the fineness of cement by 3-5 m)2(g), 78-82% of modified electrolytic manganese slag and hydrated lime (Ca (OH)) which are roasted and activated at the temperature of 350-450 DEG C2) 0 to 18 percent of the slag cement admixture and 0 to 22 percent of the clinker powder are evenly mixed to prepare the slag cement admixture, and the slag cement admixture is essentially prepared by roasting and activating sulfate waste residues subjected to superfine grinding at low temperature into soluble anhydrous calcium sulfate and adding alkali (Ca (OH)2) The sulfur-alkali composite excitant prepared by compounding the components has high cost, has no obvious technical effect advantage compared with cheap dihydrate gypsum or anhydrite and lime as the sulfur-alkali excitant, and has poor economical efficiency.
In addition to the above-mentioned problems, the existing methods for producing electrolytic manganese slag directly used as raw material for producing cement or as admixture have extremely poor practical effects (all have the exemplary application lines of production stoppage or half production stoppage), which result in high energy consumption and serious secondary pollution.
(2) As retarder, sulfate excitant: namely, the treated electrolytic manganese slag is used as a retarder instead of gypsum, such as the comprehensive utilization result of the electrolytic manganese slag developed by the cooperation of the Hunan province building material research and design institute and the Central and south schools, which is essentially characterized in that sulfate minerals in the electrolytic manganese slag are activated to be used as an activating agent for cement production and a retarder for replacing gypsum; lipping (research on physicochemical characteristics and development and application of electrolytic manganese slag, manganese industry in China, No. 24, No. 2, 2006, 5 months) for heat treatment of electrolytic manganese slag at 750 ℃, can be developed into a sulfate excitant of fly ash and blast furnace slag, can also be used in combination with fly ash or blast furnace slag to produce a concrete composite admixture, or replace gypsum as a cement retarder, and compared with the method using natural anhydrite or industrial fluorgypsum, the method has no remarkable technical effect, but has high cost and no economy; CN103553378A discloses a method for preparing cement by using electrolytic manganese slag as a retarder, which is to mix, stir and modify the electrolytic manganese slag, an alkaline modifier (quicklime CaO) and water according to the proportion of 8:1:1 to prepare the cement retarder, wherein the consumption of the cement is 4-10% of the output of clinker. The alternative retarder is cheaper dihydrate gypsum or modified cheap phosphogypsum, has no remarkable technical effect and no economy. The method not only influences the performance of the cement, but also causes secondary pollution in the processing process.
(3) The method is used for producing bricks, building blocks, ceramsite and aggregate building materials: the electrolytic manganese slag is used for producing building materials, including a cement bond curing method and a sintering method. The cement cementation and solidification method takes electrolytic manganese slag or washing manganese slag as a main raw material, takes cement as a cementing material for molding and solidification, has extremely poor product volume stability in the later period except for pollution diffusion, and stops tens of conventional production lines. The sintering method is formed and sintered by mixing manganese slag with clay/shale and the like, and has the disadvantages of large secondary pollution and poor product volume stability when the mixing amount is high.
(4) As roadbed material: the manganese slag instead of partial soil and stone is used to build highway subgrade, subbase, base course and road surface, which is essentially only a pollutant transfer method.
(5) Manganese fertilizer or manganese silicon fertilizer is produced by using manganese slag: for example, Wangbianan and DengJianqi of Hunan West environmental protection agency in Hunan province, etc. research and develop a method for preparing a composite fertilizer from manganese slag, and for example, CN102674965A discloses a manganese slag composite fertilizer and a preparation method thereof.
(6) The comprehensive utilization method of the manganese slag comprises the following steps: comprehensive utilization of manganese slag focuses on extracting some valuable elements or compounds in manganese slag, for example, a comprehensive utilization method of manganese slag disclosed in CN104017998A and a method for producing chemical raw materials by comprehensive utilization of manganese slag disclosed in CN104016357A are obtained by crushing manganese slag, mixing the crushed manganese slag with a fluosilicic acid aqueous solution or an ammonium fluoride solution, heating for reaction, and performing multi-stage separation and extraction to obtain white carbon black, manganese sulfate, sulfate and aluminum hydroxide. Such as washing and recovering manganese sulfate, adding cement into solid slag after washing and solidifying to prepare ceramics, bone particles and the like, which are developed by great noble industries. However, the above-mentioned technical solutions have problems such as poor economy, low consumption, or significant secondary pollution, and the like, and thus the problem of recycling electrolytic manganese slag cannot be objectively solved.
The above-mentioned various existing technical approaches or technical methods related to the treatment and comprehensive utilization of electrolytic manganese slag objectively obtain certain research results or application results, and the treatment of manganese slag has also been listed in the national '863 plan' and accepted by results, but until now, the actual comprehensive utilization effect of a large amount of electrolytic manganese slag is not fully satisfactory, and a large amount of electrolytic manganese slag is simply piled up or abandoned in a culvert and a ditch, or is treated by landfill after being dried (serious gas pollution is generated in the drying process), which causes great influence and long-term hidden danger to the ecological environment of underground water, soil and surface water, and thus a brand new technical approach and method are urgently needed to solve the problem of resource utilization of large and wide-area manganese slag.
On the other hand, the dry-process rotary kiln cement has huge capacity in China, the scale of the current cement enterprises is large, the coverage is wide, ammonia water is widely adopted for denitration, and no effective method is found until now how to utilize a dry-process cement production plant to cooperatively treat electrolytic manganese slag while producing portland cement.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects in the prior art and provide the method for cooperatively treating the electrolytic manganese slag by using the production line of the dry-process rotary kiln cement plant, which has the advantages of simple operation, less technical improvement investment, larger treatment capacity and no secondary pollution.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for cooperatively processing electrolytic manganese slag by a production line of a dry-process rotary kiln cement plant comprises the following steps: in the normal operation dry-process rotary kiln cement production line, electrolytic manganese slag is continuously fed into a high-temperature kiln tail smoke chamber in dry-process rotary kiln production line equipment, and meanwhile, the oxidizing atmosphere calcination and the kiln tail fan air draft in the rotary kiln are controlled to maintain the normal calcination of clinker in the kiln and the normal operation of the dry-process rotary kiln cement production line.
Further, the electrolytic manganese slag is at least one of wet fresh electrolytic manganese slag, a manganese slag mixture after being homogenized by adding limestone powder, a manganese slag mixed material obtained by adding limestone powder and mixing by rolling, or stacked and dried electrolytic manganese slag or manganese slag mixed with other wastes.
Further, the moisture content of the wet fresh electrolytic manganese slag is 20-35%.
Further, the addition amount of the limestone powder in the manganese slag mixture after the homogenization by adding the limestone powder is 20-50% of the weight of the manganese slag mixture.
Further, electrolytic manganese slag and carbide slag = 1: 0.2-1 in the homogeneous manganese slag mixed material obtained by adding carbide slag and rolling.
Further, the particle size of the piled and dried electrolytic manganese slag is less than or equal to 20mm, and the water content is less than or equal to 20%.
Furthermore, the adding amount of the electrolytic manganese slag is 0.5-21%, preferably 5-15% of the mass of the raw material powder in the production line of the dry-method rotary kiln cement plant.
Further, the specific operation steps of continuously feeding the electrolytic manganese slag into a kiln tail smoke chamber of the dry-process rotary kiln production line equipment are as follows: and continuously feeding the electrolytic manganese slag into the kiln tail smoke chamber by using the air locking feeding mechanism, or continuously feeding the electrolytic manganese slag into a feeding distillation pipe of a fifth-stage or lowest-stage cyclone preheater into the kiln tail smoke chamber by using the air locking feeding mechanism.
Furthermore, the dry-process rotary kiln cement production line is a novel dry-process cement production line widely applied at present, and the calcination of clinker in the kiln and the operation of the dry-process rotary kiln cement production line refer to normal calcination and normal operation of the novel dry-process cement production line kiln system for producing silicate clinker.
The technical principle and the beneficial effects of the invention are as follows:
(1) according to the characteristics of a clinker production kiln system of a dry-method cement production line and the characteristics of electrolytic manganese slag, the electrolytic manganese slag which is not dried can be directly fed into a smoke chamber at the tail of the kiln, the moisture in the manganese slag can reduce the temperature of the smoke chamber, the skinning of the smoke chamber is reduced, and the moisture in the manganese slag is quickly converted into high-temperature steam to enter a decomposing furnace, so that the gasification combustion of carbon granules in the decomposing furnace can be promoted; ammonium (NH) in manganese slag4+) Ammonia generated by thermal decomposition is volatilized into the decomposing furnace, so that the using amount of denitrified ammonia water can be reduced;
(2) the oxidizing atmosphere in the rotary kiln is controlled for calcination, so that the decomposition of sulfate in the manganese slag can be inhibited, the combination stability of the sulfate, alumina, ferric oxide and calcium oxide into calcium sulphoaluminate, calcium sulphoaluminate and calcium sulfate is promoted, the gypsum dosage during cement production by clinker grinding can be reduced or eliminated, and the cost is reduced.
(3) Aiming at the balance of the rotary kiln system, the balance is a dynamic balance, the air draught of a kiln tail fan is properly increased according to the situation, and the moisture of the manganese slag and the amount of additional gas generated by decomposable substances of the manganese slag are balanced in time so as to ensure the normal calcination of clinker in the kiln and the stable operation of the kiln system.
(4) Aiming at the compatibility in the process of producing and calcining clinker in a kiln system of a dry cement production line, various mineral components in the electrolytic manganese slag are effectively utilized, partial raw materials such as silicon, aluminum, iron, calcium sulfate and the like can be saved, heavy metals can be completely solidified, the aim of comprehensively utilizing resources is fulfilled, and the quality of the clinker and the performance of cement are basically not influenced.
(5) The method is simple, the investment of technical improvement is small, the disposal quantity of manganese slag is large, and because the dry-method cement production line in China has large production capacity and large scale, 1 ton of clinker needs about 1.58 tons of raw material powder, no secondary pollution is caused, the original electrolytic manganese slag and the piled or abandoned electrolytic manganese slag can be fully utilized, and the social ecological environment and the natural environment are protected.
Detailed Description
The present invention will be further described with reference to the following examples.
The chemicals used in the examples of the present invention described below were obtained from conventional commercial sources unless otherwise specified.
Example 1
Taking fresh electrolytic manganese slag of a manganese industry company, wherein the water content of the fresh electrolytic manganese slag is 29.7 percent, and the main chemical component (mass percent) of the fresh electrolytic manganese slag is SiO235.17%，Fe2O35.42%，Al2O311.49%，CaO 9.74%，MgO 2.84%，MnO 3.69%，SO331.17%，TiO20.39%，NH4+0.31 percent. The method utilizes a dry-process rotary kiln cement production line with the diameter of 4.2 multiplied by 64m of a certain factory to carry out a co-processing electrolytic manganese slag test,
the operation steps of this embodiment are as follows: under the normal production and operation state of the kiln system, the primary wet electrolytic manganese slag with the water content of 29.7 percent is directly and continuously fed into a kiln tail smoke chamber from a lower material distillation pipe of a five-stage preheater, the oxidizing atmosphere in the rotary kiln is controlled to calcine, silicate clinker is normally calcined at 1450 ℃, the kiln system is normally adjusted to improve the draught fan draught volume of a kiln tail fan by air so as to keep the dynamic balance of the kiln system, the manganese slag feeding volume is gradually improved to 11.3 percent after 24 hours according to 1 percent of the raw material feeding volume, the working condition of the kiln system is normal, and the sintering state of the clinker is equivalent.
Factory feedback: the weight of the clinker is equivalent, the dosage of the denitrified ammonia water is reduced by 5.9 percent in the same ratio, the coal for sintering is equivalent (the heat consumption of the clinker is not increased), and the physical inspection performance index of the clinker is equivalent. The test shows that the wet electrolytic manganese slag is feasible to be cooperatively treated by the dry cement production line, the method is simple, and no secondary pollution is caused.
Example 2
Taking fresh electrolytic manganese slag of a certain manganese industry company, the water content of the fresh electrolytic manganese slag is 32.1 percent, and the main chemical component (unit:%) of the fresh electrolytic manganese slag is analyzed to be SiO230.38，Fe2O310.79，Al2O35.37，CaO 10.84，MgO 1.39，MnO 3.02，SO310.63，TiO22.22，【NH4+0.71. Grinding limestone powder which is 28 percent of the mass fraction of the limestone powder and passes through a 180-mesh sieve is taken as a regulator of the manganese slag, and the wet manganese slag and the limestone powder are rolled, mixed and homogenized according to the proportion of 2.5:1 to form a wet manganese slag mixed material; the electrolytic manganese slag is co-processed by a dry-process rotary kiln cement production line with the diameter of 4.0 multiplied by 62.5m in a certain factory.
The operation steps of this embodiment are as follows: under the normal production and operation state of the kiln system, the wet manganese slag mixed material is continuously fed into a kiln tail smoke chamber through an air locking feeder, the oxidizing atmosphere in the rotary kiln is controlled for calcination, silicate clinker is normally calcined at 1450 ℃, air used by the kiln system is normally adjusted, the air pulling quantity of a kiln tail fan is increased, the dynamic balance of the kiln system is kept, the feeding quantity of the wet manganese slag mixed material is gradually increased to 15% after 16 hours from 5% of the raw material feeding quantity, the working condition of the kiln system is normal, and the clinker sintering condition is not obviously changed.
Factory feedback: the weight of the clinker is equivalent, the dosage of the denitrified ammonia water is reduced by 6.7 percent in the same ratio, the coal for sintering is equivalent (the heat consumption of the clinker is not increased), and the physical inspection performance index of the clinker is equivalent. The test shows that the dry-method cement production line is feasible for cooperatively treating the wet-state electrolytic manganese slag mixed material, the method is simple, and no secondary pollution is caused.
Example 3
Crushing aged electrolytic manganese slag in a storage yard of a manganese company to below 15mm, wherein the average water content is 13.9 percent, and the main chemical component (unit:%) of the analysis is SiO227.67，Fe2O34.69，Al2O37.76，CaO 17.8，MgO 2.14，MnO 2.55，SO331.92，TiO20.41，【NH4+0.19. The method utilizes a dry-process rotary kiln cement production line with the diameter of 4.3 multiplied by 66m of a certain factory to carry out a co-processing electrolytic manganese slag test,
the operation steps of this embodiment are as follows: and under the normal production and operation state of the kiln system, continuously feeding the aged electrolytic manganese slag into a kiln tail smoke chamber through an air locking feeder, controlling the oxidizing atmosphere in the rotary kiln to calcine, normally calcining the silicate clinker at 1450 ℃, normally adjusting air for the kiln system, improving the air drawing rate of a kiln tail fan, keeping the dynamic balance of the kiln system, gradually increasing the feeding amount of the aged manganese slag to 17% after 12 hours according to 5% of the feeding amount of raw materials, ensuring that the working condition of the kiln system is normal and the firing condition of the clinker is not obviously changed.
Factory feedback: the weight of the clinker is equivalent, the dosage of the denitrified ammonia water is reduced by 4 percent, the coal for sintering is equivalent (the heat consumption of the clinker is not increased), and the physical inspection performance index of the clinker is equivalent. The test shows that the dry-method cement production line is feasible for cooperatively treating the wet-state electrolytic manganese slag mixed material, the method is simple, and no secondary pollution is caused.
Example 4
Crushing aged electrolytic manganese slag in a storage yard of a manganese industry company to below 10mm, wherein the water content is 17.6 percent, and the main chemical component (unit:%) of analysis is SiO228.37，Fe2O36.49，Al2O38.85，CaO 13.09，MgO 1.95，MnO 5.81，SO317.97，TiO20.41，【NH4+0.21. Taking carbide slag (with water content of 29%) of a carbide slag storage yard of a certain chemical plant as a regulator of manganese slag, and rolling and homogenizing the carbide slag and the manganese slag according to the proportion of electrolytic manganese slag to carbide slag = 2: 1 to obtain a manganese slag mixed material; the co-processing electrolytic manganese slag test is carried out by utilizing a dry-method rotary kiln cement production line with the diameter of 4.8 multiplied by 74m in a certain factory.
The operation steps of this embodiment are as follows: and under the normal production and operation state of the kiln system, continuously feeding the aged electrolytic manganese slag mixed material with the water content of 17.6% into a kiln tail smoke chamber through an air locking feeder, controlling the oxidizing atmosphere in the rotary kiln to calcine, normally calcining silicate clinker at 1450 ℃, normally adjusting air used by the kiln system, increasing the air pulling amount of a kiln tail fan, keeping the dynamic balance of the kiln system, gradually increasing the feeding amount of the manganese slag mixed material to 19.8% after 8 hours according to 6% of the raw material feeding amount, ensuring that the working condition of the kiln system is normal and the clinker firing condition has no obvious change.
Factory feedback: the weight of the clinker is equivalent, the dosage of the denitrified ammonia water is reduced by 3.5 percent in the same ratio, the coal for sintering is equivalent (the heat consumption of the clinker is not increased), and the physical inspection performance index of the clinker is equivalent. The test shows that the cooperative treatment of the electrolytic manganese slag in the dry cement production line is feasible, the method is simple, and no secondary pollution is caused.
Example 5
Taking fresh electrolytic manganese slag of a certain manganese industry company, wherein the average water content is 24.7%, and the main chemical component (unit:%) for analysis is SiO214.97，Fe2O314.36，Al2O35.27，CaO 20.38，MgO 0.27，MnO7.18，，SO325.47，【NH4+0.63. The method utilizes a dry-process rotary kiln cement production line with the diameter of 4.2 multiplied by 64m of a certain factory to carry out a co-processing electrolytic manganese slag test,
the operation steps of this embodiment are as follows: under the normal production and operation state of the kiln system, the primary wet manganese slag with the moisture content of 24.7 percent is directly and continuously fed into a kiln tail smoke chamber from a discharge distillation pipe of a five-stage preheater, the oxidizing atmosphere in the rotary kiln is controlled for calcination, silicate clinker is normally calcined at 1450 ℃, the air consumption of the kiln system is normally adjusted, the air drawing quantity of a kiln tail fan is increased, the dynamic balance of the kiln system is kept, the manganese slag feeding quantity is gradually increased to 15 percent from 5 percent of the raw material feeding quantity after 16 hours, the working condition of the kiln system is normal, and the sintering state of the clinker is equivalent.
Factory feedback: the weight of the clinker is equivalent, the dosage of the denitrified ammonia water is reduced by 8.4 percent in the same ratio, the coal for sintering is equivalent (the heat consumption of the clinker is not increased), and the physical inspection performance index of the clinker is equivalent. The test shows that the wet electrolytic manganese slag is feasible to be cooperatively treated by the dry cement production line, the method is simple, and no secondary pollution is caused.
Claims (10)
1. A method for cooperatively processing electrolytic manganese slag by a production line of a dry-process rotary kiln cement plant is characterized by comprising the following steps: the method comprises the following steps: in the normally-operated dry-process rotary kiln cement production line, electrolytic manganese slag is continuously fed into a kiln tail smoke chamber in dry-process rotary kiln production line equipment, and meanwhile, the calcination of the oxidative atmosphere in the rotary kiln and the air drawing of a kiln tail fan are controlled to maintain the calcination of clinker in the kiln and the normal operation of the dry-process rotary kiln cement production line.
2. The method for the cooperative treatment of the electrolytic manganese residues by the dry-process rotary kiln cement plant production line according to claim 1, characterized in that: the electrolytic manganese slag is at least one of wet fresh electrolytic manganese slag, a manganese slag mixture after adding limestone powder for homogenization, a manganese slag mixture obtained by adding limestone powder for mixing by rolling, or a manganese slag mixed with other wastes in a piling and drying manner.
3. The method for treating electrolytic manganese slag by using a dry-process rotary kiln cement plant production line as claimed in claim 2, wherein: the moisture content of the wet fresh electrolytic manganese slag is 20-35%.
4. The method for treating electrolytic manganese slag by using a dry-process rotary kiln cement plant production line as claimed in claim 2, wherein: the addition amount of the limestone powder in the manganese slag mixture after the homogenization by adding the limestone powder is 20-50% of the weight of the manganese slag mixture.
5. The method for treating electrolytic manganese slag by using a dry-process rotary kiln cement plant production line as claimed in claim 2, wherein: electrolytic manganese slag and carbide slag = 1: 0.2-1 in the manganese slag mixed material subjected to carbide slag rolling and homogenizing.
6. The method for treating electrolytic manganese slag by using a dry-process rotary kiln cement plant production line as claimed in claim 2, wherein: the particle size of the piled and dried electrolytic manganese slag is less than or equal to 20mm, and the water content is less than or equal to 20%.
7. The method for treating electrolytic manganese residues in a dry rotary kiln cement plant production line according to any one of claims 1 to 6, wherein: the addition amount of the electrolytic manganese slag is 0.5-21% of the mass of the raw material powder in the production line of the dry-process rotary kiln cement plant.
8. The method for treating electrolytic manganese residues by using a dry-process rotary kiln cement plant production line as claimed in claim 7, wherein: the addition amount of the electrolytic manganese slag is 5-15% of the mass of the raw material powder in the production line of the dry-process rotary kiln cement plant.
9. The method for treating electrolytic manganese residues in a dry rotary kiln cement plant production line according to any one of claims 1 to 8, wherein: the specific operation steps of continuously feeding the electrolytic manganese slag into a kiln tail smoke chamber in the dry-process rotary kiln production line equipment are as follows: and continuously feeding the electrolytic manganese slag into the kiln tail smoke chamber by using the air locking feeding mechanism, or continuously feeding the electrolytic manganese slag into a feeding distillation pipe of a fifth-stage or lowest-stage cyclone preheater into the kiln tail smoke chamber by using the air locking feeding mechanism.
10. The method for treating electrolytic manganese residues with a dry rotary kiln cement plant line according to any one of claims 1 to 9, characterized in that: the dry-process rotary kiln cement production line is a novel dry-process cement production line, and the calcination of clinker in the kiln and the operation of the dry-process rotary kiln cement production line refer to the normal calcination and normal operation of the silicate clinker produced by a kiln system of the novel dry-process cement production line.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112321216A (en) * | 2020-11-19 | 2021-02-05 | 广西云燕特种水泥建材有限公司 | Method for preparing concrete water permeable brick by utilizing manganese slag |
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Application publication date: 20200410 |