CN112159128A - Low-energy-consumption cement clinker and preparation method thereof - Google Patents

Low-energy-consumption cement clinker and preparation method thereof Download PDF

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CN112159128A
CN112159128A CN202011135727.2A CN202011135727A CN112159128A CN 112159128 A CN112159128 A CN 112159128A CN 202011135727 A CN202011135727 A CN 202011135727A CN 112159128 A CN112159128 A CN 112159128A
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parts
sludge
low
raw material
cement clinker
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平巧丽
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Hangzhou Zhongao Industrial Design Co ltd
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Hangzhou Zhongao Industrial Design Co ltd
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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
    • C04B7/24—Cements from oil shales, residues or waste other than slag
    • C04B7/243—Mixtures thereof with activators or composition-correcting additives, e.g. mixtures of fly ash and alkali activators
    • 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
    • C04B7/36—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
    • C04B7/38—Preparing or treating the raw materials individually or as batches, e.g. mixing with fuel
    • C04B7/42—Active ingredients added before, or during, the burning process
    • C04B7/421—Inorganic materials
    • C04B7/425—Acids or salts thereof
    • 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
    • C04B7/42—Active ingredients added before, or during, the burning process
    • C04B7/428—Organic materials
    • 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
    • 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
    • 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

Abstract

The invention belongs to the technical field of building materials, and discloses a low-energy-consumption cement clinker which is prepared from the following raw materials in parts by weight: 80-90 parts of low-grade limestone, 6-12 parts of quartz sand ore dressing sludge, 1-3 parts of waterworks sludge, 1-5 parts of titanium-containing blast furnace slag, 0.01-0.1 part of calcium carbonate decomposition accelerator and 0.01-0.05 part of lattice regulator. Through reasonable proportioning, addition of additives and synergistic effect of various materials, resource utilization of limestone tailings, quartz sand ore dressing sludge, waterworks sludge and titanium-containing blast furnace slag is realized, the traditional cement production process and equipment are used, industrial and engineering wastes are ingeniously consumed, and the method has good economic benefit and environmental protection benefit.

Description

Low-energy-consumption cement clinker and preparation method thereof
Technical Field
The invention belongs to the technical field of building materials, and particularly relates to a low-energy-consumption cement clinker and a preparation method thereof.
Background
China is a big country for producing and using cement, and the cement yield in China in 2019 reaches 23 hundred million tons, which accounts for more than 60% of the world cement yield. The production of cement clinker is a high-energy-consumption and high-pollution industry, and needs to consume a large amount of natural resources and energy sources such as limestone, iron ore, clay, coal and the like. The resources such as limestone face the risk of exhaustion, and data shows that the reserves of high-grade limestone which is proved in China at present can only meet the production requirements of the cement industry for more than 30 years. The current rising of cement yield also indirectly shows the consumption of various raw materials and the shortage of resources. Meanwhile, in China, a large amount of industrial solid wastes such as tailings, smelting slag and the like are discharged every year, and the discharge of the large amount of solid wastes occupies valuable land resources, causes serious environmental pollution and deteriorates ecological environment. Meanwhile, industrial solid waste is also a potential secondary resource, and how to effectively utilize the solid waste is also an urgent problem to be solved. The research on preparing cement by using alkali slag has been reported, the clinker sintering temperature can be reduced to 1100 ℃, the energy consumption is greatly saved, but the releasing and diffusing capacity of chloride ions in the cement and the corrosion problem of reinforced concrete are to be further solved.
Disclosure of Invention
Aiming at the problems, the invention provides the low-energy-consumption cement clinker, which respectively replaces calcium carbonate raw materials, clay raw materials and iron correction components in the traditional cement production with titanium slag, quartz sand ore dressing sludge and water plant sludge by effective technical means, exerts the physicochemical comprehensive effect of each waste material, reduces the firing temperature of the clinker, develops the low-energy-consumption cement clinker which meets the current national standard and has wide market prospect, and has reasonable technology, controllable quality and contribution to energy conservation and environmental protection. In order to achieve the purpose, the invention adopts the following technical scheme that the low-energy-consumption cement clinker is prepared from the following raw materials in parts by weight: 80-90 parts of low-grade limestone, 6-12 parts of quartz sand ore dressing sludge, 1-3 parts of water plant sludge, 1-5 parts of titanium-containing blast furnace slag, 0.01-0.1 part of calcium carbonate decomposition accelerator and 0.01-0.05 part of lattice regulator, wherein the parts by weight are dry-based parts by weight.
The quartz sand ore dressing sludge is a byproduct generated in the process of producing silica sand for float glass by adopting a wet process;
the waterworks sludge is a byproduct generated in the coagulating sedimentation process of water treatment;
the titanium-containing blast furnace slag is formed after iron making by using iron ore concentrate with high titanium content, and the titanium content (calculated by TiO 2) is 17-28%;
the calcium carbonate decomposition accelerator is one of lithium benzoate, lithium perchlorate and magnesium trifluoromethanesulfonate;
the lattice regulating agent is one of sodium metavanadate, potassium metavanadate and ammonium metavanadate.
The preparation method of the low-energy consumption cement clinker comprises the following steps:
1) raw material pretreatment and homogenization: carrying out filter pressing dehydration on the waterworks sludge to reduce the water content to 50% -70%, and then respectively carrying out homogenization treatment on the waterworks sludge, low-grade limestone, quartz sand ore dressing sludge and titaniferous blast furnace slag;
2) raw material preparation and homogenization: proportioning low-grade limestone, waterworks sludge, quartz sand ore dressing sludge and titanium-containing blast furnace slag according to a proportion, adding a calcium carbonate decomposition accelerator and a lattice regulator through a reamer weigher, grinding by using a vertical mill to obtain raw material powder, controlling the fineness of the ground raw material to be 80 mu m of the screen residue to be 16 +/-2 percent and the fineness of the ground raw material to be less than or equal to 3 percent, feeding the ground raw material powder into a homogenizing warehouse through an eight-nozzle distributor for circular blowing and stirring, and homogenizing and storing;
3) preheating and decomposing raw materials and calcining clinker: the homogenized raw meal powder is sequentially sent into a preheater and a decomposing furnace for preheating and decomposing treatment, the decomposition rate is controlled to be more than or equal to 93 percent, the decomposed raw meal is calcined in a rotary kiln for 15-20 min, the kiln tail temperature is controlled to be 1100-.
The sludge of the water plant contains a large amount of silt, has higher contents of silicon dioxide and aluminum oxide, in addition, a certain amount of aluminum and iron are contained in a coagulant, which are indispensable components in the sintering of cement clinker, and the sludge of the water plant contains Zn2+、Mn2+、Co2+、Ni2+Etc. different metal ions, can be substituted for Ca2+The formed compound is dissolved in the crystal lattice of the clinker minerals in a solid way, the clinker mineral structure is improved, the clinker firing temperature can be reduced, the clinker structural defects can be increased, the clinker strength is increased, the harmless treatment and the resource utilization of the sludge can be realized, and the cement is improvedImportant technical measures for performance; the titanium-containing blast furnace slag contains C2AS, CS and other low-melting minerals, and C in solid phase reaction period2S formation is greatly promoted, and TiO in the S formation2Can lower the decomposition temperature of calcium carbonate and the formation temperature of dicalcium silicate, and has beta-C ratio2S plays a stabilizing role; the calcium carbonate decomposition accelerator can be wedged into the surface layer of the raw material, so that the decomposition activation energy of calcium carbonate is reduced, the decomposition rate of calcium carbonate is increased, and the initial decomposition temperature and the complete decomposition temperature of calcium carbonate are reduced; the crystal lattice regulating agent has a doping function, so that the crystal lattice parameter of tricalcium silicate in clinker is changed, crystal defects are increased, the chemical stability is reduced, the chemical reaction activity is improved, and the strength of the clinker is improved.
The invention has the beneficial effects that:
1. the invention applies the water plant sludge as the raw material to the preparation of the cement clinker, can provide a certain amount of elements such as iron, aluminum and the like for the cement clinker, and other impurity ions can reduce the sintering temperature of the clinker and improve the performance of the cement clinker, thereby not only effectively utilizing the solid waste residues and reducing the cost of the cement clinker, but also solidifying the metal elements in the sludge, and realizing the effect of recycling the waste residues to prepare additional products with economic and social values.
2. Through reasonable proportioning, addition of additives and synergistic effect of various materials, resource utilization of limestone tailings, quartz sand ore dressing sludge, waterworks sludge and titanium-containing blast furnace slag is realized, the traditional cement production process and equipment are used, industrial and engineering wastes are ingeniously consumed, and the method has good economic benefit and environmental protection benefit.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
TABLE 1 chemical composition of raw materials for examples
Name (R) SiO2 Al2O3 Fe2O3 CaO MgO TiO2 LOSS
Waterworks sludge 52.77 19.75 6.67 2.97 1.94 -- 11.03
Titanium-containing blast furnace slag 26.56 14.42 2.28 28.25 7.69 18.40 --
Quartz sand ore dressing sludge 89.74 4.96 2.13 0.06 0.33 -- --
Low grade limestone 9.61 2.53 0.93 46.71 1.54 -- 37.38
Example 1
The low-energy-consumption cement clinker is prepared from the following raw materials in parts by weight: 80 parts of low-grade limestone, 12 parts of quartz sand ore dressing sludge, 1 part of waterworks sludge, 5 parts of titanium-containing blast furnace slag, 0.01 part of calcium carbonate decomposition accelerator and 0.05 part of lattice regulator, wherein the parts by weight are dry-based parts by weight.
The calcium carbonate decomposition accelerator is lithium benzoate.
The lattice regulating agent is sodium metavanadate.
The preparation method of the low-energy consumption cement clinker comprises the following steps:
1) raw material pretreatment and homogenization: carrying out filter pressing dehydration on the waterworks sludge to reduce the water content to 50% -70%, and then respectively carrying out homogenization treatment on the waterworks sludge, low-grade limestone, quartz sand ore dressing sludge and titaniferous blast furnace slag;
2) raw material preparation and homogenization: proportioning low-grade limestone, waterworks sludge, quartz sand ore dressing sludge and titanium-containing blast furnace slag according to a proportion, adding a calcium carbonate decomposition accelerator and a lattice regulator through a reamer weigher, grinding by using a vertical mill to obtain raw material powder, controlling the fineness of the ground raw material to be 80 mu m of the screen residue to be 16 +/-2 percent and the fineness of the ground raw material to be less than or equal to 3 percent, feeding the ground raw material powder into a homogenizing warehouse through an eight-nozzle distributor for circular blowing and stirring, and homogenizing and storing;
3) preheating and decomposing raw materials and calcining clinker: the homogenized raw meal powder is sequentially sent into a preheater and a decomposing furnace for preheating and decomposing treatment, the decomposition rate is controlled to be more than or equal to 93 percent, the decomposed raw meal is calcined in a rotary kiln for 15-20 min, the kiln tail temperature is controlled to be 1050 ℃, the secondary air temperature is 1100-1150 ℃, the tertiary air temperature is 900-950 ℃, and the raw meal powder is taken out of the rotary kiln and cooled by a grate cooler to obtain the clinker.
Example 2
The low-energy-consumption cement clinker is prepared from the following raw materials in parts by weight: 90 parts of low-grade limestone, 6 parts of quartz sand ore dressing sludge, 3 parts of waterworks sludge, 1 part of titanium-containing blast furnace slag, 0.1 part of calcium carbonate decomposition accelerator and 0.01 part of lattice regulator, wherein the parts by weight are dry-based parts by weight.
The calcium carbonate decomposition accelerator is lithium perchlorate.
The lattice regulating agent is potassium metavanadate.
The preparation method of the low-energy consumption cement clinker comprises the following steps:
1) raw material pretreatment and homogenization: carrying out filter pressing dehydration on the waterworks sludge to reduce the water content to 50% -70%, and then respectively carrying out homogenization treatment on the waterworks sludge, low-grade limestone, quartz sand ore dressing sludge and titaniferous blast furnace slag;
2) raw material preparation and homogenization: proportioning low-grade limestone, waterworks sludge, quartz sand ore dressing sludge and titanium-containing blast furnace slag according to a proportion, adding a calcium carbonate decomposition accelerator and a lattice regulator through a reamer weigher, grinding by using a vertical mill to obtain raw material powder, controlling the fineness of the ground raw material to be 80 mu m of the screen residue to be 16 +/-2 percent and the fineness of the ground raw material to be less than or equal to 3 percent, feeding the ground raw material powder into a homogenizing warehouse through an eight-nozzle distributor for circular blowing and stirring, and homogenizing and storing;
3) preheating and decomposing raw materials and calcining clinker: the homogenized raw meal powder is sequentially sent into a preheater and a decomposing furnace for preheating and decomposing treatment, the decomposition rate is controlled to be more than or equal to 93 percent, the decomposed raw meal is calcined in a rotary kiln for 15-20 min, the kiln tail temperature is controlled to be 1050-shaped and 1100 ℃, the secondary air temperature is 1150-shaped and 1200 ℃, the tertiary air temperature is 900-shaped and 950 ℃, and the raw meal powder is cooled by a grate cooler after being taken out of the rotary kiln to obtain the clinker.
Example 3
The low-energy-consumption cement clinker is prepared from the following raw materials in parts by weight: 85 parts of low-grade limestone, 8 parts of quartz sand ore dressing sludge, 2 parts of waterworks sludge, 3 parts of titanium-containing blast furnace slag, 0.05 part of calcium carbonate decomposition accelerator and 0.04 part of lattice regulator, wherein the parts by weight are dry-based parts by weight.
The calcium carbonate decomposition accelerator is magnesium trifluoromethanesulfonate.
The lattice regulator is ammonium metavanadate.
The preparation method of the low-energy consumption cement clinker comprises the following steps:
1) raw material pretreatment and homogenization: carrying out filter pressing dehydration on the waterworks sludge to reduce the water content to 50% -70%, and then respectively carrying out homogenization treatment on the waterworks sludge, low-grade limestone, quartz sand ore dressing sludge and titaniferous blast furnace slag;
2) raw material preparation and homogenization: proportioning low-grade limestone, waterworks sludge, quartz sand ore dressing sludge and titanium-containing blast furnace slag according to a proportion, adding a calcium carbonate decomposition accelerator and a lattice regulator through a reamer weigher, grinding by using a vertical mill to obtain raw material powder, controlling the fineness of the ground raw material to be 80 mu m of the screen residue to be 16 +/-2 percent and the fineness of the ground raw material to be less than or equal to 3 percent, feeding the ground raw material powder into a homogenizing warehouse through an eight-nozzle distributor for circular blowing and stirring, and homogenizing and storing;
3) preheating and decomposing raw materials and calcining clinker: the homogenized raw meal powder is sequentially sent into a preheater and a decomposing furnace for preheating and decomposing treatment, the decomposition rate is controlled to be more than or equal to 93 percent, the decomposed raw meal is calcined in a rotary kiln for 15-20 min, the kiln tail temperature is controlled to be 1100-.
Example 4
The low-energy-consumption cement clinker is prepared from the following raw materials in parts by weight: 86 parts of low-grade limestone, 10 parts of quartz sand ore dressing sludge, 1.8 parts of waterworks sludge, 2 parts of titanium-containing blast furnace slag, 0.04 part of calcium carbonate decomposition accelerator and 0.02 part of lattice regulator, wherein the parts by weight are dry basis parts by weight.
The calcium carbonate decomposition accelerator is lithium perchlorate.
The lattice regulating agent is sodium metavanadate.
The preparation method of the low-energy consumption cement clinker comprises the following steps:
1) raw material pretreatment and homogenization: carrying out filter pressing dehydration on the waterworks sludge to reduce the water content to 50% -70%, and then respectively carrying out homogenization treatment on the waterworks sludge, low-grade limestone, quartz sand ore dressing sludge and titaniferous blast furnace slag;
2) raw material preparation and homogenization: proportioning low-grade limestone, waterworks sludge, quartz sand ore dressing sludge and titanium-containing blast furnace slag according to a proportion, adding a calcium carbonate decomposition accelerator and a lattice regulator through a reamer weigher, grinding by using a vertical mill to obtain raw material powder, controlling the fineness of the ground raw material to be 80 mu m of the screen residue to be 16 +/-2 percent and the fineness of the ground raw material to be less than or equal to 3 percent, feeding the ground raw material powder into a homogenizing warehouse through an eight-nozzle distributor for circular blowing and stirring, and homogenizing and storing;
3) preheating and decomposing raw materials and calcining clinker: the homogenized raw meal powder is sequentially sent into a preheater and a decomposing furnace for preheating and decomposing treatment, the decomposition rate is controlled to be more than or equal to 93 percent, the decomposed raw meal is calcined in a rotary kiln for 15-20 min, the kiln tail temperature is controlled to be 1100-.
Example 5
The low-energy-consumption cement clinker is prepared from the following raw materials in parts by weight: 82 parts of low-grade limestone, 11 parts of quartz sand ore dressing sludge, 1.5 parts of waterworks sludge, 2 parts of titanium-containing blast furnace slag, 0.08 part of calcium carbonate decomposition accelerator and 0.02 part of lattice regulator, wherein the parts by weight are dry-basis parts by weight.
Comparative example 1
The low-energy-consumption cement clinker is prepared from the following raw materials in parts by weight: 85 parts of low-grade limestone, 8 parts of quartz sand ore dressing sludge, 2 parts of waterworks sludge, 3 parts of titanium-containing blast furnace slag and 0.04 part of lattice regulator, wherein the parts by weight are dry-basis parts by weight.
The lattice regulator is ammonium metavanadate.
The preparation method of the low-energy consumption cement clinker comprises the following steps:
1) raw material pretreatment and homogenization: carrying out filter pressing dehydration on the waterworks sludge to reduce the water content to 50% -70%, and then respectively carrying out homogenization treatment on the waterworks sludge, low-grade limestone, quartz sand ore dressing sludge and titaniferous blast furnace slag;
2) raw material preparation and homogenization: proportioning low-grade limestone, waterworks sludge, quartz sand ore dressing sludge and titanium-containing blast furnace slag according to a proportion, adding a calcium carbonate decomposition accelerator and a lattice regulator through a reamer weigher, grinding by using a vertical mill to obtain raw material powder, controlling the fineness of the ground raw material to be 80 mu m of the screen residue to be 16 +/-2 percent and the fineness of the ground raw material to be less than or equal to 3 percent, feeding the ground raw material powder into a homogenizing warehouse through an eight-nozzle distributor for circular blowing and stirring, and homogenizing and storing;
3) preheating and decomposing raw materials and calcining clinker: the homogenized raw meal powder is sequentially sent into a preheater and a decomposing furnace for preheating and decomposing treatment, the decomposition rate is controlled to be more than or equal to 93 percent, the decomposed raw meal is calcined in a rotary kiln for 15-20 min, the kiln tail temperature is controlled to be 1100-.
Comparative example 2
The low-energy-consumption cement clinker is prepared from the following raw materials in parts by weight: 86 parts of low-grade limestone, 10 parts of quartz sand ore dressing sludge, 1.8 parts of waterworks sludge, 2 parts of titanium-containing blast furnace slag and 0.04 part of calcium carbonate decomposition accelerator, wherein the parts by weight are dry-based parts by weight.
The calcium carbonate decomposition accelerator is lithium perchlorate.
The preparation method of the low-energy consumption cement clinker comprises the following steps:
1) raw material pretreatment and homogenization: carrying out filter pressing dehydration on the waterworks sludge to reduce the water content to 50% -70%, and then respectively carrying out homogenization treatment on the waterworks sludge, low-grade limestone, quartz sand ore dressing sludge and titaniferous blast furnace slag;
2) raw material preparation and homogenization: proportioning low-grade limestone, waterworks sludge, quartz sand ore dressing sludge and titanium-containing blast furnace slag according to a proportion, adding a calcium carbonate decomposition accelerator and a lattice regulator through a reamer weigher, grinding by using a vertical mill to obtain raw material powder, controlling the fineness of the ground raw material to be 80 mu m of the screen residue to be 16 +/-2 percent and the fineness of the ground raw material to be less than or equal to 3 percent, feeding the ground raw material powder into a homogenizing warehouse through an eight-nozzle distributor for circular blowing and stirring, and homogenizing and storing;
3) preheating and decomposing raw materials and calcining clinker: the homogenized raw meal powder is sequentially sent into a preheater and a decomposing furnace for preheating and decomposing treatment, the decomposition rate is controlled to be more than or equal to 93 percent, the decomposed raw meal is calcined in a rotary kiln for 15-20 min, the kiln tail temperature is controlled to be 1100-.
Performance testing
The clinker fired from the formulations of examples 1-5 and comparative examples 1-2 was subjected to a strength test, according to the clinker: gypsum = 96%: 4 percent of the raw materials are mixed and ground into 340 +/-10 m of a ratio table2The mortar strength was measured as/kg and is shown in Table 2 below.
Table 2 clinker performance test results
Figure DEST_PATH_IMAGE002

Claims (7)

1. The low-energy-consumption cement clinker is characterized by being prepared from the following raw materials in parts by weight: 80-90 parts of low-grade limestone, 6-12 parts of quartz sand ore dressing sludge, 1-3 parts of water plant sludge, 1-5 parts of titanium-containing blast furnace slag, 0.01-0.1 part of calcium carbonate decomposition accelerator and 0.01-0.05 part of lattice regulator, wherein the parts by weight are dry-based parts by weight.
2. The low energy consumption cement clinker according to claim 1, wherein the silica sand beneficiated sludge is a by-product of a silica sand process used in the production of float glass using a wet process.
3. The low energy consumption cement clinker of claim 1, wherein the waterworks sludge is a byproduct produced during the coagulating sedimentation process of water treatment.
4. The low energy consumption cement clinker according to claim 1, wherein the titanium-containing blast furnace slag is blast furnace slag formed after iron making using iron concentrate with high titanium content, and the titanium content (calculated as TiO 2) is 17-28%.
5. The low energy consumption cement clinker according to claim 1, wherein the calcium carbonate decomposition accelerator is one of lithium benzoate, lithium perchlorate and magnesium triflate.
6. The low energy consumption cement clinker according to claim 1, wherein the lattice modifier is one of sodium metavanadate, potassium metavanadate and ammonium metavanadate.
7. The method for preparing the low-energy-consumption cement clinker as recited in any one of claims 1 to 6, characterized by comprising the steps of:
1) raw material pretreatment and homogenization: carrying out filter pressing dehydration on the waterworks sludge to reduce the water content to 50% -70%, and then respectively carrying out homogenization treatment on the waterworks sludge, low-grade limestone, quartz sand ore dressing sludge and titaniferous blast furnace slag;
2) raw material preparation and homogenization: proportioning low-grade limestone, waterworks sludge, quartz sand ore dressing sludge and titanium-containing blast furnace slag according to a proportion, adding a calcium carbonate decomposition accelerator and a lattice regulator through a reamer weigher, grinding by using a vertical mill to obtain raw material powder, controlling the fineness of the ground raw material to be 80 mu m of the screen residue to be 16 +/-2 percent and the fineness of the ground raw material to be less than or equal to 3 percent, feeding the ground raw material powder into a homogenizing warehouse through an eight-nozzle distributor for circular blowing and stirring, and homogenizing and storing;
3) preheating and decomposing raw materials and calcining clinker: the homogenized raw meal powder is sequentially sent into a preheater and a decomposing furnace for preheating and decomposing treatment, the decomposition rate is controlled to be more than or equal to 93 percent, the decomposed raw meal is calcined in a rotary kiln for 15-20 min, the kiln tail temperature is controlled to be 1100-.
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Cited By (3)

* Cited by examiner, † Cited by third party
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CN115259706A (en) * 2022-06-08 2022-11-01 沂南中联水泥有限公司 Low-alkali cement and preparation process thereof
CN115448622A (en) * 2022-09-16 2022-12-09 大冶尖峰水泥有限公司 Method for producing high-strength clinker by using high-sulfur high-magnesium limestone
CN115557756A (en) * 2022-11-03 2023-01-03 华新水泥股份有限公司 Carbonized board based on low-grade low-carbon cement clinker and preparation method thereof

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115259706A (en) * 2022-06-08 2022-11-01 沂南中联水泥有限公司 Low-alkali cement and preparation process thereof
CN115448622A (en) * 2022-09-16 2022-12-09 大冶尖峰水泥有限公司 Method for producing high-strength clinker by using high-sulfur high-magnesium limestone
CN115448622B (en) * 2022-09-16 2023-09-22 大冶尖峰水泥有限公司 Method for producing high-strength clinker by utilizing high-sulfur high-magnesium limestone
CN115557756A (en) * 2022-11-03 2023-01-03 华新水泥股份有限公司 Carbonized board based on low-grade low-carbon cement clinker and preparation method thereof
CN115557756B (en) * 2022-11-03 2023-11-03 华新水泥股份有限公司 Carbonized plate based on low-grade low-carbon cement clinker and preparation method thereof

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