CN112456939A - Preparation method for preparing composite calcium silicate board by electrolytic manganese slag - Google Patents
Preparation method for preparing composite calcium silicate board by electrolytic manganese slag Download PDFInfo
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- C—CHEMISTRY; METALLURGY
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- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions 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
- C04B28/10—Lime cements or magnesium oxide cements
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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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/14—Waste materials; Refuse from metallurgical processes
- C04B18/141—Slags
- C04B18/144—Slags from the production of specific metals other than iron or of specific alloys, e.g. ferrochrome slags
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- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions 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
- C04B28/04—Portland cements
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00612—Uses not provided for elsewhere in C04B2111/00 as one or more layers of a layered structure
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
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- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
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Abstract
The invention discloses a preparation method for preparing a composite calcium silicate board by electrolytic manganese residues, and relates to the technical field of decorative low-density and fireproof calcium silicate boards. The invention comprises the preparation steps of raw materials: the raw materials for preparing the composite calcium silicate board comprise, by mass, 40-60% of electrolytic manganese slag, 10-20% of alkaline calcium material, 10-20% of cement clinker, 2-10% of sepiolite, 2-10% of wood pulp and 5-8% of expanded perlite; the method comprises the steps of pretreatment of electrolytic manganese slag, mixing pulping and forming maintenance. The invention adopts the electrolytic manganese slag without ammonia to completely replace siliceous materials to prepare the low-density fireproof composite calcium silicate board for interior decoration. The composite calcium silicate board has certain strength during early-stage blank forming, is easy to form, and is also beneficial to high-temperature maintenance in the later stage.
Description
Technical Field
The invention relates to the technical field of decorative low-density and fireproof calcium silicate boards, in particular to a preparation method for preparing a composite calcium silicate board by using electrolytic manganese residues.
Background
The electrolytic manganese industry is a typical three-high one-low industry with high investment, high consumption, high pollution and low benefit, the problems of resource shortage and environmental pollution are increasingly highlighted while the electrolytic manganese industry is developed at a high speed, wherein the manganese slag pollution is particularly prominent, and 6 t-10 t of manganese slag is generated when 1 ton of manganese is produced. At present, 131 electrolytic manganese metal production enterprises in China have the productivity of 100 million tons, and the enterprises generate about 600 to 1000 million tons of waste residues, 2 hundred million tons of waste water and more than 80 million tons of waste gas (mainly CO) every year2Gas and sulfuric acid mist). More than 5000 million tons of electrolytic manganese residues exist in China, and the quantity of the electrolytic manganese residues is increased by about 1000 million tons each year. The manganese slag contains Mn2+、NH4+、Co2+、Zn2+、Cu2+Various pollutants containing heavy metals are easy to enter local ecological environment along with rainwater, percolate and the like in the stacking process, so that local soil, rivers and underground water are polluted, the ecological environment problem with eye contact is counted, the annual emission of electrolytic manganese slag in China in 2012 is 1000 ten thousand tons, the annual emission of electrolytic manganese slag in Guizhou province is 260 ten thousand tons, and accounts for 26% of the whole country (wherein the annual emission of electrolytic manganese slag in only the copper kernel region in 2012 is 200 ten thousand tons, and the accumulated accumulation of the electrolytic manganese slag is about 1000 ten thousand tons), and the annual emission of electrolytic manganese slag in the Zun city is about 40 ten thousand tons and is basically zero in use. The long-term open-air storage of a large amount of electrolytic manganese slag has great influence on underground water and surrounding environment, has attracted great attention of governments in provinces, provinces and environment protection halls and copper kernel regions, and the problem of resource utilization of the electrolytic manganese slag needs to be solved urgently. The production of novel energy-saving wall materials by utilizing the electrolytic manganese residues is the best mode for solving the problems of large accumulation of the electrolytic manganese residues and environmental pollution.
In the electrolytic manganese slag, quartz and clay minerals which can not react in the ore, and residual soluble ions and heavy metal ions exist in a large amount. The electrolytic manganese slag is a slag sample generated by a filter pressing process. The manganese slag is particles and tiny particles (the particle size is 100-200 meshes), and the manganese slag contains hydroxide colloid of iron remained after impurity removal, so that the water in the manganese slag is difficult to filter and press completely. The existence of these soluble ions can be further entered into the soil through water circulationThe biosphere can harm human beings. The soluble ions mainly comprise ammonia, nitrogen, manganese, mercury, arsenic, cobalt and the like, wherein researches show that the leaching concentration of manganese in manganese slag can reach 163 mg.L-1Is the limit of national standard (2 mg. L)-1) More than 80 times. The pollution degree of heavy metal pollutants is ranked as manganese, selenium, cadmium, chromium, lead and the like.
Because the electrolytic manganese slag is relatively special waste slag, has high viscosity and high water content, basically belongs to inert materials, and is always short of an effective utilization mode. The existing harmless disposal mode is almost blank, and the main basic research and utilization modes comprise the following aspects:
(1) the electrolytic manganese slag is used to replace gypsum as a cement retarder. Under the condition of less mixing amount, the electrolytic manganese slag meets the technical requirement of serving as a cement retarder. When the retarder is applied to cement, the coagulation time of the cement is abnormal due to the heavy metal ions in the electrolytic manganese slag, and the consumption is low. And a disposal method with a large consumption amount is urgently needed.
(2) The electrolytic manganese slag is used for preparing the composite cementing material. The application is more, and the resource treatment mode is mainly to prepare the cementing material by utilizing the excitation effect of a large amount of sulfate existing in the electrolytic manganese slag on the volcanic ash material. Because the excitation effect of the amount of sulfate ions in the electrolytic manganese slag is not obvious, the strength of the cementing material is not high.
For example, CN110903046A, "a method for preparing building cementitious material using leaching residue of electrolytic manganese residue", mainly uses concentrated sulfuric acid to treat the leaching residue of electrolytic manganese residue to generate sulfate residue and acid-leaching electrolytic manganese residue solution, the acid-leaching electrolytic metal solution removes various metals, effectively recovers composite iron-aluminum phosphate, copper-cobalt-nickel sulfide concentrate, manganese carbonate concentrate and ammonia water, mixes with the sulfate residue, mixes with portland cement, and generates cementitious material. The main problems are that the preparation process is complex, a large amount of clear water is needed to prepare the ore pulp, the pH value of the ore pulp is adjusted for many times, and the portland cement is stirred and mixed to prepare the cementitious building material. The operation process is complex, and a large amount of waste water and waste residues are generated in the middle process, so that the environmental burden is increased. The solid waste which is difficult to treat in nature, such as electrolytic manganese slag by digestion, has poor effect and low strength of the gelled material.
Also, for example, CN102167533A, "a slag cement admixture compositely excited and modified by manganese slag and a preparation method thereof", is mainly a slag cement admixture compositely excited and modified by manganese slag and a preparation method thereof, and is prepared by firstly drying and pretreating electrolytic manganese slag with a water content of less than 10%, grinding manganese slag with a specific surface area of more than 13m2/g, pretreating manganese slag at 350 ℃ -450 ℃, furnace-cooling to room temperature, and mixing and grinding pretreated electrolytic manganese slag, slaked lime and cement clinker.
(3) Used for producing ash bricks and clay bricks. The electrolytic manganese slag is suitable for manufacturing bricks with various properties, and the utilization modes are mainly based on the characteristic that the electrolytic manganese slag belongs to an inert silicate material, and clay brick products are produced by raw material ingredients;
for example, CN 111606634A 'an electrolytic manganese slag autoclaved brick and a preparation method' the electrolytic manganese slag autoclaved brick adopts 60-70% of electrolytic manganese slag, 5-10% of quicklime, 10-20% of cement, 10-15% of siliceous material, 1-5% of aluminum paste and 1-2% of dispersant, and proper amounts of quicklime, water, siliceous material and aluminum paste are added into a forced stirrer to be stirred, and high-temperature curing is carried out after molding. The invention is mainly limited in that the mixing process can generate larger heat release and ammonia gas release, the reaction of calcium oxide and water increases the consistency of the mixture, and the occupational health and safety of constructors are difficult to guarantee.
For another example, CN110304901A is a method for preparing water permeable bricks and air permeable bricks from electrolytic manganese residues, which comprises drying different plant fibers at 95 ℃ with electrolytic manganese residues, grinding the mixed sample to a certain fineness according to a certain ratio, pressing, and sintering at different temperatures. There is a safety risk during the application process.
In the process of applying the electrolytic manganese slag, the main components of the electrolytic manganese slag are silicon dioxide, aluminum oxide and sulfur trioxide, so the application difficulty is high; during the application process, the ammonia gas which is harmful to human health is easily generated by the reaction with alkaline substances, and the ammonium sulfate is easily decomposed into sulfur dioxide at high temperature, so that the environmental burden is easily caused; the electrolytic manganese slag is not applied to calcium silicate boards, and is particularly applied to light, fireproof and heat-insulating boards for indoor decoration.
Disclosure of Invention
In order to overcome the defects and shortcomings in the prior art, the invention provides a preparation method for preparing a composite calcium silicate board by using electrolytic manganese slag, and aims to prepare a low-density fireproof composite calcium silicate board for internal decoration by completely replacing a siliceous material with ammonia-removed electrolytic manganese slag. The composite calcium silicate board has certain strength during early-stage blank forming, is easy to form, and is also beneficial to high-temperature maintenance in the later stage.
In order to solve the problems in the prior art, the invention is realized by the following technical scheme:
a preparation method for preparing a composite calcium silicate board by electrolytic manganese slag comprises the following steps:
step one, preparation of raw materials: the raw materials for preparing the composite calcium silicate board comprise the following components in percentage by mass:
40-60% of electrolytic manganese slag, 10-20% of alkaline calcareous material, 10-20% of cement clinker, 2-10% of sepiolite, 2-10% of wood pulp and 5-8% of expanded perlite;
step two, pretreatment of electrolytic manganese slag:
determining the water content of the electrolytic manganese slag, drying the electrolytic manganese slag to constant weight at 105 ℃, and measuring the content of ammonium ions;
according to the ammonium ion amount of the electrolytic manganese slag, adding an alkaline calcareous material;
adjusting the water consumption according to the fluidity of the mixture of the electrolytic manganese slag and the alkaline calcareous material and the water content in the electrolytic manganese slag to ensure that the water-cement ratio is kept between 0.8 and 1.0;
carrying out sample mixing deamination reaction by adopting a stirrer with a closed pipeline, uniformly stirring by using the stirrer, controlling the stirring speed to be 25-35 r/min, connecting the upper opening of the stirrer to an ammonia spraying opening of a five-stage cyclone preheater through a sealed pipeline, and connecting ammonia gas generated by electrolytic manganese slag to the ammonia spraying opening in a cement production line through the negative pressure action in the preheater and the stirring of blades of the stirrer;
stirring for 10-30 min at constant speed by a stirrer, and pumping the pretreated electrolytic manganese slag into a reactor after the deamination reaction is completed to finish the deamination pretreatment of the electrolytic manganese slag.
Step three, mixing and pulping: mixing the electrolytic manganese slag after the deamination pretreatment with clinker, the rest alkaline calcareous material, wood pulp, expanded perlite and sepiolite with water, controlling the water-cement ratio to be 1.0-1.2, uniformly mixing and stirring for 60-120 min, and uniformly stirring to form slurry for later use.
Step four, forming and maintaining: adopting a pulp flowing method to flow the slurry prepared in the step two onto a felt, pressing a blank by adopting a press after the blank is preliminarily formed, and adjusting the water content in the blank to be 20-40% to prepare a blank; pre-curing the blank at the low temperature of 20-40 ℃ for 8-10h, curing at the temperature of 1.0-3.0MPa and 170-200 ℃ for 14-20h, demolding, drying, and performing surface treatment to prepare the composite calcium silicate board.
The water content of the electrolytic manganese slag is 10-40%, and SO3≤18%。
The alkaline calcareous material is one of carbide slag or hydrated lime, and the calcium content reaches 65-80%.
The cement clinker is silicate cement clinker with specific surface area of 280-320m2Per kg, and C3The content of A is 3-5%.
The particle diameter D of the sepiolite powder50≤50μm，D90≤80μm。
The wood pulp is iron leaf forest wood pulp, and the length average value is within 2-5 mm.
The expanded perlite is the expanded perlite with the grain size distribution of 1.18mm-2.38mm and the content of the grains of which reaches more than 60 percent.
Compared with the prior art, the beneficial technical effects brought by the invention are as follows:
1. the composite calcium silicate board provided by the invention has the application range of low-density fireproof calcium silicate boards for interior decoration, and is prepared by completely replacing siliceous materials such as silica sand and the like with electrolytic manganese slag without ammonia. The conventional calcareous and siliceous materials react at high temperature to form xonotlite, wherein electrolytic manganese slag reacts with alkaline calcareous materials, sulfate ions in the components, tricalcium aluminate in cement and amorphous aluminum materials form ettringite, manganese ions easily react with iron aluminate, the manganese ions are solidified into mineral phases to support the early-stage blank to be molded, and the electrolytic manganese blank has certain strength, reduces the damage of the blank and is beneficial to the later-stage high-temperature maintenance. During the reaction process of the electrolytic manganese and the alkaline calcareous material, ammonium ions in the electrolytic manganese slag can be removed, ammonia gas can be reused during the ammonia removal process, and the ammonia gas is applied to a cement production line.
2. In the invention, the unreacted gypsum in the electrolytic manganese slag is the main component of the gypsum board as the secondary gypsum, and the semi-hydrated gypsum formed at high temperature and high pressure in the last step can also be applied in the application range of the gypsum board, and can be used as a decorative inner wall with fire resistance, moisture absorption and fire prevention.
3. The invention can be used for greatly treating industrial waste residue-electrolytic manganese residue, effectively utilizes silicon element which is difficult to utilize in manganese residue, adopts a chemical method to pretreat the electrolytic manganese residue, efficiently utilizes a large amount of water in the manganese residue to prepare ammonia gas and ammonia water, is applied to the cement production process, effectively carries out desulfurization and deamination in the cement production, adopts composite fiber, utilizes inorganic mineral fiber and plant fiber to improve the toughness of a calcium silicate board, adopts composite lightening material (sepiolite and expanded perlite) to reduce the density of the calcium silicate board, and the calcium silicate board can effectively dissolve trace ions in the manganese residue.
Detailed Description
The technical solution of the present invention will be further elaborated with reference to the following detailed description.
The detection parameters of the composite calcium silicate board prepared in the following examples and the reference standard of each detection parameter are JC/T412.1-2015 fibre cement slab, and the specific parameters are shown in the following table 1:
table 1 shows the reference standards for the respective test parameters of JC/T412.1-2015 "fiber cement plate".
Example 1
As a preferred embodiment of the present invention, the embodiment discloses a composite calcium silicate board prepared from electrolytic manganese residues, wherein the raw materials for preparing the composite calcium silicate board comprise the following components by mass: 50% of electrolytic manganese slag, 20% of alkaline calcareous material, 10% of cement clinker, 2% of sepiolite, 10% of wood pulp and 8% of expanded perlite; wherein the water content of the electrolytic manganese slag is 40%, SO3=17.8%, the mass fraction of ammonium ions is 4.5%, and the alkaline calcium material is carbide slag (the content of available calcium reaches 80%); the cement clinker is silicate cement clinker with specific surface area of 320m2/kg，C3A4%; sepiolite powder: particle diameter D50=50μm，D90=80 μm; the wood pulp is coniferous forest wood, and the average length is 4.4 mm; expanded perlite: the content of particles with the particle size distribution of 1.18mm-2.38mm reaches 65 percent;
the process for preparing the composite calcium silicate board by adopting the raw materials is as follows:
step one, pretreatment of electrolytic manganese slag: selecting electrolytic manganese slag with the water content of 40%, drying at 105 ℃ to constant weight, and measuring the content of ammonium ions;
according to the amount of ammonium ions in the electrolytic manganese slag, 10% of alkaline calcium material is doped (the mass percentage of the alkaline calcium material is the mass percentage of the electrolytic manganese slag, and the ammonium ions in the electrolytic manganese slag and the alkaline calcium material need to be subjected to neutralization reaction);
adjusting the water consumption according to the fluidity of the mixture of the electrolytic manganese slag and the alkaline calcareous material and the water content in the electrolytic manganese slag to ensure that the water-cement ratio is kept at 0.8;
a mixer with a closed pipeline is adopted to carry out sample mixing deamination reaction, the mixer is used for mixing at a constant speed, the mixing speed is controlled to be 28r/min, the upper opening of the mixer is connected to an ammonia spraying opening of a five-stage cyclone preheater through the sealed pipeline, electrolytic manganese slag ammonia gas is connected to the ammonia spraying opening of a cement production enterprise through the negative pressure action in the preheater and the blade stirring of the mixer, the ammonia gas is consumed in the cement production process,
stirring for 30min at a constant speed by a stirrer, and pumping the pretreated electrolytic manganese slag into a reactor after the deamination reaction is completed to finish the deamination pretreatment of the electrolytic manganese slag.
Step two, mixing and pulping: uniformly mixing and stirring the electrolytic manganese slag after the deamination pretreatment with clinker, carbide slag, Xinjiang pinorelin fiber, expanded perlite powder, sepiolite and water in a controlled cement ratio of 1.0 for 60min, and uniformly stirring to form slurry for later use.
Step three, forming and maintaining: and (2) adopting a pulp flowing method, flowing the slurry onto a felt, primarily forming a plate blank, pressing the plate blank by using a press, adjusting the water content of the plate blank to be 20%, preparing the plate blank, pre-curing the plate blank at the low temperature of 40 ℃ for 10h, curing at the temperature of 2.0MPa and 190 ℃ for 20h, demolding, drying, and carrying out surface treatment to prepare the light refractory calcium silicate plate.
The physical property parameters are shown in the following table 2:
table 2 is a table comparing the physical properties of the composite calcium silicate board prepared in example 1.
Example 2
As a preferred embodiment of the present invention, the embodiment discloses a composite calcium silicate board prepared from electrolytic manganese residues, wherein the raw materials for preparing the composite calcium silicate board comprise the following components by mass: 40% of electrolytic manganese slag, 19% of alkaline calcareous material, 19% of cement clinker, 9% of sepiolite, 8% of wood pulp and 5% of expanded perlite; wherein the water content of the electrolytic manganese slag is 30 percent, and SO310.1 percent, 3.8 percent of ammonium ion mass fraction and hydrated lime (the effective calcium content reaches 80 percent) as an alkaline calcareous material; the cement clinker is silicate cement clinker with specific surface area of 320m2/kg，C3A5%; sepiolite powder: particle diameter D50=50μm，D90=80 μm; the wood pulp is North America coniferous forest wood, and the length average value is 3.8 mm; expanded perlite: the content of particles with the particle size distribution of 1.18mm-2.38mm reaches 70 percent;
the process for preparing the composite calcium silicate board by adopting the raw materials is as follows:
step one, pretreatment of electrolytic manganese slag: selecting electrolytic manganese slag with the water content of 30%, drying at 105 ℃ to constant weight, and measuring the content of ammonium ions;
according to the amount of ammonium ions in the electrolytic manganese slag, 7.5% of an alkaline calcium material is doped (the mass percentage of the alkaline calcium material doped is the mass percentage of the amount of the electrolytic manganese slag, and the ammonium ions in the electrolytic manganese slag and the alkaline calcium material need to be subjected to neutralization reaction);
adjusting the water consumption according to the fluidity of the mixture of the electrolytic manganese slag and the alkaline calcareous material and the water content in the electrolytic manganese slag to ensure that the water-cement ratio is kept at 0.9;
a mixer with a closed pipeline is adopted to carry out sample mixing deamination reaction, the mixer is used for mixing at a constant speed, the mixing speed is controlled to be 35r/min, the upper opening of the mixer is connected to an ammonia spraying opening of a five-stage cyclone preheater through a sealed pipeline, electrolytic manganese slag ammonia gas is connected to the ammonia spraying opening of a cement production enterprise through the negative pressure action in the preheater and the blade stirring of the mixer, the ammonia gas is consumed in the cement production process,
stirring for 10min at a constant speed by a stirrer, and pumping the pretreated electrolytic manganese slag into a reactor after the deamination reaction is completed to finish the deamination pretreatment of the electrolytic manganese slag.
Step two, mixing and pulping: uniformly mixing and stirring the electrolytic manganese slag after the deamination pretreatment with clinker, carbide slag, Xinjiang pinorelin fiber, expanded perlite powder, sepiolite and water in a controlled cement ratio of 1.0 for 60min, and uniformly stirring to form slurry for later use.
Step three, forming and maintaining: and (2) adopting a pulp flowing method, flowing the slurry onto a felt, preliminarily forming a plate blank, pressing the plate blank by using a press, adjusting the water content of the plate blank to be 20%, preparing the plate blank, pre-curing the plate blank at the low temperature of 30 ℃ for 10h, curing at the temperature of 1.0MPa and 170 ℃ for 18h, demolding, drying, and carrying out surface treatment to prepare the light refractory calcium silicate plate.
The physical property parameters are shown in the following table 3:
table 3 is a comparative table of the physical properties of the composite calcium silicate board prepared in example 2.
Example 3
As another preferred embodiment of the present invention, the embodiment discloses a composite calcium silicate board prepared from electrolytic manganese residues, wherein the raw materials for preparing the composite calcium silicate board comprise the following components by mass: 60% of electrolytic manganese slag, 10% of alkaline calcareous material, 20% of cement clinker, 2% of sepiolite, 2% of wood pulp and 6% of expanded perlite; wherein the water content of the electrolytic manganese slag is 50 percent, and SO38.5 percent, 4.5 percent of ammonium ion mass fraction and hydrated lime (the effective calcium content reaches 80 percent) as an alkaline calcareous material; the cement clinker is silicate cement clinker with specific surface area of 280m2/kg，C3A5%; sepiolite powder: particle diameter D50≤50μm，D90Less than or equal to 80 mu m; the wood pulp is Xinjiang pinus tabulaeformis, and the average length is 3.8 mm; expanded perlite: the content of particles with the particle size distribution of 1.18mm-2.38mm reaches 60 percent;
the process for preparing the composite calcium silicate board by adopting the raw materials is as follows:
step one, pretreatment of electrolytic manganese slag: selecting electrolytic manganese slag with the water content of 50%, drying at 105 ℃ to constant weight, and measuring the content of ammonium ions;
according to the amount of ammonium ions in the electrolytic manganese slag, 5% of alkaline calcium material is doped (the mass percentage of the alkaline calcium material doped is the mass percentage of the electrolytic manganese slag, and the ammonium ions in the electrolytic manganese slag and the alkaline calcium material need to be subjected to neutralization reaction);
adjusting the water consumption according to the fluidity of the mixture of the electrolytic manganese slag and the alkaline calcareous material and the water content in the electrolytic manganese slag to ensure that the water-cement ratio is kept at 1.0;
a mixer with a closed pipeline is adopted to carry out sample mixing deamination reaction, the mixer is used for mixing at a constant speed, the mixing speed is controlled to be 25r/min, the upper opening of the mixer is connected to an ammonia spraying opening of a five-stage cyclone preheater through a sealed pipeline, electrolytic manganese slag ammonia gas is connected to the ammonia spraying opening of a cement production enterprise through the negative pressure action in the preheater and the blade stirring of the mixer, the ammonia gas is consumed in the cement production process,
stirring for 15min at a constant speed by a stirrer, and pumping the pretreated electrolytic manganese slag into a reactor after the deamination reaction is completed to finish the deamination pretreatment of the electrolytic manganese slag.
Step two, mixing and pulping: uniformly mixing and stirring the electrolytic manganese slag after the deamination pretreatment with clinker, carbide slag, Xinjiang pinorelin fiber, expanded perlite powder, sepiolite and water in a controlled cement ratio of 1.2 for 60min, and uniformly stirring to form slurry for later use.
Step three, forming and maintaining: and (2) adopting a pulp flowing method, flowing the slurry onto a felt, primarily forming a plate blank, pressing the plate blank by using a press, adjusting the water content of the plate blank to be 20%, preparing the plate blank, pre-curing the plate blank at the low temperature of 40 ℃ for 10h, curing at the temperature of 3.0MPa and 200 ℃ for 14h, demolding, drying, and carrying out surface treatment to prepare the light refractory calcium silicate plate.
The physical property parameters are shown in the following table 4:
table 4 is a comparative table of the physical properties of the composite calcium silicate board prepared in example 3.
Claims (7)
1. A preparation method for preparing a composite calcium silicate board by electrolytic manganese slag is characterized by comprising the following steps: the method comprises the following steps:
step one, preparation of raw materials: the raw materials for preparing the composite calcium silicate board comprise the following components in percentage by mass:
40-60% of electrolytic manganese slag, 10-20% of alkaline calcareous material, 10-20% of cement clinker, 2-10% of sepiolite, 2-10% of wood pulp and 5-8% of expanded perlite;
step two, pretreatment of electrolytic manganese slag:
determining the water content of the electrolytic manganese slag, drying the electrolytic manganese slag to constant weight at 105 ℃, and measuring the content of ammonium ions; according to the ammonium ion amount of the electrolytic manganese slag, adding an alkaline calcareous material; adjusting the water consumption according to the fluidity of the mixture of the electrolytic manganese slag and the alkaline calcareous material and the water content in the electrolytic manganese slag to ensure that the water-cement ratio is kept between 0.8 and 1.0; carrying out sample mixing deamination reaction by adopting a stirrer with a closed pipeline, uniformly stirring by using the stirrer, controlling the stirring speed to be 25-35 r/min, connecting the upper opening of the stirrer to an ammonia spraying opening of a five-stage cyclone preheater through a sealed pipeline, and connecting ammonia gas generated by electrolytic manganese slag to the ammonia spraying opening in a cement production line through the negative pressure action in the preheater and the stirring of blades of the stirrer; stirring for 10-30 min at constant speed by a stirrer, and pumping the pretreated electrolytic manganese slag into a reactor after the deamination reaction is completed to finish the deamination pretreatment of the electrolytic manganese slag;
step three, mixing and pulping: mixing the electrolytic manganese slag after the deamination pretreatment with clinker, the rest alkaline calcareous material, wood pulp, expanded perlite and sepiolite with water, controlling the water-cement ratio to be 1.0-1.2, uniformly mixing and stirring for 60-120 min, and uniformly stirring to form slurry for later use;
step four, forming and maintaining: adopting a pulp flowing method to flow the slurry prepared in the step two onto a felt, pressing a blank by adopting a press after the blank is preliminarily formed, and adjusting the water content in the blank to be 20-40% to prepare a blank; pre-curing the blank at the low temperature of 20-40 ℃ for 8-10h, curing at the temperature of 1.0-3.0MPa and 170-200 ℃ for 14-20h, demolding, drying, and performing surface treatment to prepare the composite calcium silicate board.
2. The method for preparing the composite calcium silicate board by electrolyzing the manganese slag as claimed in claim 1, wherein the method comprises the following steps: the water content of the electrolytic manganese slag is 10-40%, and SO3≤18%。
3. The method for preparing the composite calcium silicate board by electrolyzing the manganese slag as claimed in claim 1, wherein the method comprises the following steps: the alkaline calcareous material is one of carbide slag or hydrated lime, and the calcium content reaches 65-80%.
4. The method for preparing the composite calcium silicate board by electrolyzing the manganese slag as claimed in claim 1, wherein the method comprises the following steps: the cement clinker is silicate cement clinker with specific surface area of 280-320m2Per kg, and C3A containsThe amount is 3-5%.
5. The method for preparing the composite calcium silicate board by electrolyzing the manganese slag as claimed in claim 1, wherein the method comprises the following steps: the particle diameter D of the sepiolite powder50≤50μm，D90≤80μm。
6. The method for preparing the composite calcium silicate board by electrolyzing the manganese slag as claimed in claim 1, wherein the method comprises the following steps: the wood pulp is iron leaf forest wood pulp, and the length average value is within 2-5 mm.
7. The method for preparing the composite calcium silicate board by electrolyzing the manganese slag as claimed in claim 1, wherein the method comprises the following steps: the expanded perlite is the expanded perlite with the grain size distribution of 1.18mm-2.38mm and the content of the grains of which reaches more than 60 percent.
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