An aluminosilicate-based cementitious material, its preparation process and applications, as well as its raw material processing system

Abstract

An aluminosilicate-based cementitious material, its preparation process and applications, as well as its raw material processing system. The present invention falls within the technical field of construction materials, and specifically relates to an aluminosilicate-based cementitious material, its preparation process and applications, as well as its raw material processing system.The aluminosilicate-based cementitious material comprises a base material and an alkaline activator, in mass percentage said base material comprises the following raw materials: 30-70% calcined coal gangue, 0-30% red mud, 0-30% steel slag, 0-40% cement clinker, 0-40% gypsum, 0-10% carbide slag; in which said red mud is calcined or uncalcined red mud; the strength formation is rapid, the final strength is high and the applications are vast; it allows simultaneously the consumption of large quantities of solid waste of coal gangue, red mud, and the realization of resource valorization.The raw material processing system comprises a homogenization system, a feeding system, a drying and calcination system, and a grinding system arranged sequentially. This raw material processing system yields a raw material directly suitable for the preparation of an aluminosilicate-based cementitious material for industrial production. Figure for the abstract: none.

Description

Title of the invention: An aluminosilicate-based cementitious material, its preparation process and applications, and its raw material processing system technical field

[0001] The present invention falls within the technical field of construction materials, and relates specifically to a cementitious material based on aluminosilicate, its preparation process and its applications as well as its raw material processing system. Previous art

[0002] With constant economic development and the relentless increase in industrialization, the negative impact of the enormous quantities of solid waste from coal gangue and the accompanying red mud can no longer be ignored. Valorizing these vast quantities of industrial waste resources is key to achieving an economic and ecological transition in the metallurgical industry. Given the colossal consumption of construction materials, the use of industrial waste such as coal gangue and red mud, whose main components are silica, aluminum, and oxygen, in the preparation of aluminosilicate-based cementitious materials represents an excellent method for resource valorization. Contents of the invention

[0003] Therefore, the object of the present invention is to provide an aluminosilicate-based cementitious material, its preparation process and its applications as well as its raw material processing system; this aluminosilicate-based cementitious material can consume large quantities of coal gangue, red mud and has an exceptional degree of compressive strength.

[0004] Therefore, the present invention provides the technical plan below.

[0005] The present invention provides a raw material processing system for aluminosilicate-based cementitious material, comprising a homogenization system, a feeding system, a drying and calcination system, and a grinding system arranged successively; said homogenization system comprises a grinding device and a homogenizing device communicating successively; said feeding system comprises a fuel supply system and a raw material supply system; said fuel supply system comprises a sorting device, a dosing device, and a storage device, in which said sorting device is located at the end head of said fuel supply system; said raw material supply system includes a dosing device and a storage device; said drying and calcining system includes a drying device, a calcining device and a cooling device communicating successively; said grinding system includes a grinding device and a communicating powder selection device; said drying device includes from 1 to 9 drying devices arranged in parallel; said cooling device includes from 1 to 9 cooling devices arranged in series; when the number of cooling devices is > 1, the temperature of each cooling device decreases progressively following the direction of conveying the raw material.

[0006] Optionally, said drying device includes a drying chamber; the drying chamber may be equipped with helical drying screws.

[0007] Optionally, said calcination device includes a rotary calcination furnace.

[0008] Optionally, a burner is used to provide heat to said rotary calcination furnace;

[0009] Optionally, said calcination device is provided with a smoke chamber, said smoke chamber being located at the terminal end of the calcination device and serving to collect the hot air produced in the raw material processing system and to heat the calcination device; the hot air produced by the raw material processing system may come from the hot air of the drying chamber.

[0010] Optionally, said cooling device includes a screw conveyor and water cooling jacket.

[0011] Optionally, a raw material storage device is arranged between said drying device and said calcination device, and is used to store the raw materials after drying.

[0012] Optionally, a dosing device is arranged at the outlet of the raw material storage device.

[0013] Optionally, the raw material storage device is equipped with a hot gas outlet, said hot gas outlet communicates with said calcination device, and supplies heat to said calcination device, achieving full utilization of the system's thermal energy.

[0014] Optionally, a finished calcination product storage device is arranged between said cooling device and said grinding device, and is used to store the raw materials after calcination.

[0015] Optionally, a dosing device is arranged at the outlet of the finished calcination product storage device.

[0016] Optionally, said grinding device includes a grinding tube, the grinding tube is filled with grinding bodies, the grinding bodies being ordinary grinding bodies, it can also be steel ball grinding bodies, when the grinding tube is running, under the effect of friction between the grinding medium and the material, gravity and centrifugal force, an ordered and multidimensional cyclic movement is formed, mutual grinding occurs between the media, the medium and the material, the medium and the internal walls of the grinding tube, which makes it possible to grind the material efficiently.The grinding tube is equipped with an air inlet, an air outlet and a manhole; a cooling valve is arranged on the air inlet and serves to control the amount of air entering the grinding tube; the air outlet of the grinding tube communicates with the powder selection device and allows hot air to enter the powder selection device; in parallel, the air inlet and outlet of the grinding tube also serve to discharge the ground material and to ventilate; the manhole facilitates the replacement of the grinding body.

[0017] Optionally, a dosing device is arranged at the outlet of the grinding device.

[0018] Optionally, said grinding device is equipped with an additional ventilation device to assist the powder selection device by supplementing the necessary amount of air.

[0019] In the raw material processing system for aluminosilicate-based cementitious material of the present invention, during powder selection, the degree of conformity of the material can be adjusted according to engineering requirements; specifically, it is possible to adjust the material grain selection diameter by controlling the amount of air from the fan.

[0020] Optionally, said powder selection device is subsequently equipped with a collection device.

[0021] Optionally, said collection device includes a dust collector.

[0022] Optionally, said powder selection device is subsequently equipped with a finished product storage device.

[0023] Optionally, said finished product storage device comprises from 1 to 9 finished product storage devices arranged in parallel.

[0024] Optionally, said finished product storage device includes a final product storage store.

[0025] Optionally, said powder selection device communicates with the feed inlet of the grinding device, pushing non-conforming materials back to the grinding device for further grinding.

[0026] Optionally, said grinding device includes a pneumatic conveying system connected to it.

[0027] Optionally, said pneumatic conveying system includes a conveying pump, a blower, a dosing valve.

[0028] Optionally, said blower includes a Roots compressor.

[0029] Optionally, the head end of said feeding system includes a feeding device that takes raw material from the homogenizing device.

[0030] Optionally, said feeding system includes a feeding grapple.

[0031] Optionally, the raw materials are transferred between each device by conveying device.

[0032] Optionally, said conveying device includes at least one element from a belt conveyor, a screw conveyor, an elevator, a chute conveyor and a conduit conveyor; the suitable conveying devices and combinations of conveying devices are selected according to the position ratio between each device of the whole system and the condition of the material to be conveyed.

[0033] Optionally, said dosing device includes at least one element from among a weighing scale, an impact flowmeter, a weighing hopper; the appropriate dosing device is selected according to the trajectory of the whole system.

[0034] Optionally, the conveying device is equipped with a dust collection device and / or a fan; optionally, the drying device is equipped with a dust collection device and / or a fan; used to reduce the dispersion of dust into the outside air during the operating process.

[0035] Optionally, the finished product storage device is equipped with a dust collection device and / or a fan which, while reducing the dispersion of dust in the outside air during the operating process, helps to unload the material, blow air and homogenize the product.

[0036] The present invention provides an aluminosilicate-based cementitious material, comprising a base material and an alkaline activator, said base material comprising in mass percentage the following raw materials: 30-70% calcined coal gangue, 0-30% red mud, 0-30% steel slag, 0-40% cement clinker, 0-40% gypsum, 0-10% carbide slag; wherein said red muds are calcined red muds or uncalcined red muds.

[0037] Optionally, in the case of external addition, calculated in Na2O, the mass of said alkaline activator is less than 11% of the mass of said base material.

[0038] Optionally, said alkali activator comprises at least one element from sodium carbonate, sodium silicate and sodium hydroxide.

[0039] Preferably, said alkaline activator has a mass ratio of 1-8:2-9 of sodium carbonate and sodium silicate; the combination of said alkaline activator makes it possible to better promote the reaction between the cementitious ingredients and to further increase the degree of fracture resistance and compressive strength of the cement.

[0040] Preferably, said base material comprises in mass percentage the following raw materials: 40-70% calcined coal gangue, 10-30% red mud, 5-20% steel slag, 0-30% cement clinker, 5-30% gypsum and 1-2% carbide slag.

[0041] Optionally, said calcined coal gangue comprises by mass percentage: A12O3 > 20%, CaO < 5%, SO3 < 5%, Al / Si > 0.5; optionally, said calcined coal gangue comprises by mass percentage: A12O3 > 25%, the 28-day compressive strength activity index of said calcined coal gangue is > 85%; furthermore, optionally, said calcined coal gangue comprises by mass percentage: A12O3: 30-40%, SiO2: 40-65%, K2O + Na2O < 3%, CaO + MgO < 5%, SO3 < 3%, the 28-day compressive strength activity index is > 95%.

[0042] Optionally, said red mud comprises in mass percentage: A12O3 > 6.0%, SiO2 > 10.0%, the 28-day compressive strength activity index of said red mud is > 60%; optionally said red mud comprises in mass percentage: A12O3: 8.0-25%, SiO2: 15.0-30%, Fe2O3: 5-15%, CaO: 5.0-50%, MgO: 0.1-2%, K2O: 0.001-1%, Na2O: 2-8%, SO3 < 5%; said red mud is selected from red mud by sintering process and / or red mud by Bayer process.

[0043] Optionally, said steel slag comprises in mass percentage: CaO: 30-60%, SiO2: 10-30%, MgO: 2-20%, Fe2O3: 10-40%; optionally, said steel slag comprises in mass percentage: CaO: 38-50%, Fe2O3: 25-35%, SiO2: 14-20%, MgO: 4.5-12%, Al2O3: 1-10%, MnO < 5%, CaF2 < 2%, SO3 < 5%.

[0044] Optionally, said cement clinker is Portland cement clinker meeting the requirements of standard GB / T 21372 “Portland cement clinker”.

[0045] Optionally, said gypsum is at least one element among desulfurization gypsum, mirabilite gypsum, phosphogypsum and titanium gypsum.

[0046] Optionally, said carbide slag comprises, by mass percentage: CaO: 65-98%, SiO2: 1-10%, Al2O3: 0-5%, Fe2O3: 0-10%; optionally, said carbide slag comprises, by mass percentage: CaO: 90-98%, Fe2O3: 0-3%, SiO2: 1-5%, A12O3: 0-3%, MgO: < 1%, MnO < 1%, CaF2 < 1%, SO3 < 1%.

[0047] The present invention provides a method for preparing the aforementioned aluminosilicate-based cementitious material, comprising the following steps: mixing said raw materials according to mass percentages to obtain said base material; adding said alkaline activator to obtain the aluminosilicate-based cementitious material; or mixing said raw materials and said alkaline activator according to mass percentages to obtain the aluminosilicate-based cementitious material.

[0048] Optionally, it includes a drying step of said raw materials before preparation.

[0049] Optionally, once said base material has been obtained, and after addition of said alkali activator or after mixing said base material with said alkali activator, it further comprises a grinding step; optionally, after grinding it comprises a sieving step in order to prepare grains of diameter < 45 pm; during grinding up to 45 pm, the negative pressure sieving residues do not exceed 10%.

[0050] Optionally, said calcined coal gangue and said calcined red muds mentioned above are obtained by processing using the aforementioned aluminosilicate-based cementitious raw material processing system; optionally, the fuel used during the preparation includes biofuel.

[0051] Optionally, the heating rate of said calcined coal gangue during calcination is 1-50°C / minute, the calcination temperature is 600-1000°C, the heat retention time is 0-60 minutes.

[0052] Optionally, the heating rate of said calcined red mud during calcination is 1-50°C / minute, the calcination temperature is 600-1000°C, the heat retention time is 0-60 minutes.

[0053] The present invention provides the use of the aforementioned aluminosilicate-based cementitious material or the aforementioned aluminosilicate-based cementitious material obtained using the preparation process as a construction material.

[0054] The beneficial effects of the present invention are as follows:

[0055] The raw material processing system for aluminosilicate-based cementitious material provided by the present invention comprises a homogenization system, a feeding system, a drying and calcination system, and a grinding system arranged successively; said homogenization system comprises a grinding device and a communicating homogenization device successively; said feeding system comprises a fuel supply system and a raw material supply system; said fuel supply system comprises a sorting device, a dosing device and a storage device, in which said sorting device is located at the head end of said fuel supply system; said raw material supply system comprises a dosing device and a storage device; said drying and calcining system comprises a drying device, a calcining device and a cooling device communicating successively; said grinding system comprises a grinding device and a powder selection device communicating successively; said drying device comprises from 1 to 9 drying devices arranged in parallel; said cooling device comprises from 1 to 9 cooling devices arranged in series;When the number of cooling devices is > 1, the temperature of each cooling device gradually decreases following the direction of conveying the raw material. Thanks to this raw material processing system, it is possible to obtain the raw material used directly for the preparation of aluminosilicate-based cementitious material, which is convenient for the industrial-scale preparation of aluminosilicate-based cementitious material.

[0056] The aluminosilicate-based cementitious material of the present invention comprises a base material and an alkaline activator, said base material comprising in mass percentage the following raw materials: 30-70% calcined coal gangue, 0-30% red mud, 0-30% steel slag, 0-40% cement clinker, 0-40% gypsum, 0-10% carbide slag; wherein said red muds are calcined red muds or uncalcined red muds.The strength formation of this aluminosilicate-based cementitious material is rapid, its final strength is high, and its applications are vast; it simultaneously allows the consumption of large quantities of solid waste from coal gangue and red mud, and the recovery of resources, and while ensuring consistent cementitious product quality, it significantly reduces carbon emissions; it generates economic and environmental benefits, is very practical, and is suitable for diffusion jackets.

[0057] The process for preparing aluminosilicate-based cementitious material provided by the present invention proceeds by mixing raw materials by mass percentages to obtain the base material, adding the alkali activator to obtain the aluminosilicate-based cementitious material; or, by mixing raw materials and the alkali activator by mass percentages to obtain the aluminosilicate-based cementitious material. The preparation is simple and practical, its costs are low, it is energy efficient, low carbon emissions and environmentally friendly. Description of the accompanying figures

[0058] In order to describe more clearly the specific embodiments of the present invention or the technical plans of prior art, a brief description of the accompanying figures necessary for the descriptions of the specific embodiments of the present invention or the technical plans of prior art is given below. Of course, the accompanying figures described below represent only some embodiments of the present invention, and a person skilled in the art, provided they do not perform creative work, can derive other accompanying figures from these figures.

[0059] [Fig.1] Fig.1 represents the diagram of the raw material processing system for the aluminosilicate-based cementitious material of the present invention;

[0060] [Fig.2] The [Fig.2] represents the diagram of the homogenization system in the raw material processing system of the aluminosilicate-based cementitious material of the present invention;

[0061] [Fig.3] The [Fig.3] represents the diagram of the feeding system in the raw material processing system of the aluminosilicate-based cementitious material of the present invention;

[0062] [Fig.4] The [Fig.4] represents the diagram of the drying and calcination system in the raw material processing system of the aluminosilicate-based cementitious material of the present invention;

[0063] [Fig.5] The [Fig.5] represents the diagram of the grinding system in the raw material processing system of the aluminosilicate-based cementitious material of the present invention.

[0064] Description of the reference points on the accompanying figures:

[0065] 1, Crusher; 2, Belt conveyor; 3, Material homogenization warehouse 1. Raw materials; 4. Feeding grapple; 5. Fuel powder sieve; 6. Conduit conveyor; 7. Raw material dosing hopper; 8. Drying chamber; 9. Raw material storage store; 10. Screw conveyor; 11. Elevator; 12, burner; 13, rotary calcination furnace; 14, screw conveyor and water cooling jacket; 15, storage store for finished calcination products; 16, grinding tube; 17, selector; 18, dust collector; 19, chute conveyor; 20, weighing scale; 21, impact flow meter; 22, Roots blower; 23, conveying pump; 24, first finished product storage store; 25, fuel dosing hopper; 26, second finished product storage store; 27, third finished product storage store. Methods of implementation

[0066] A clear and complete description of the technical plan of the present invention, combined with the accompanying figures, is given below. Of course, the embodiments described constitute only a part of the embodiments, and not the entirety of them. Provided that no creative work is performed, a person skilled in the art may, based on the embodiments of the present invention, obtain other embodiments, which are covered by the scope of protection of the present invention.

[0067] In the description of the present invention, it should be noted that indications of orientation or position ratio using terms such as "center," "above / on," "below / under," "left," "right," "vertical," "horizontal," "inside / in," and "outside" are based on the orientations and position ratios shown in the accompanying figures and are used solely to simplify the description of the present invention. They do not designate or suggest that the devices or elements require a specific orientation, structure, or handling with a specific orientation, and therefore cannot be understood as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used solely for descriptive purposes and do not indicate or suggest any relative importance.

[0068] In the description of the present invention, it should be noted that, except where clearly defined or limited, the terms "installation," "connected / joined," and "connection" are to be interpreted broadly; they may refer, for example, to a fixed connection, but also to a removable or monobloc connection; they may also refer to a mechanical or electrical connection; they may be a direct connection, or an indirect connection with an intermediary; they may also refer to internal communication between two elements. A person skilled in the art can, depending on the specific circumstances, understand the meaning of the terms mentioned above in the present invention. Implementation methods 1

[0069] A description of the raw material processing system for aluminosilicate-based cementitious material in embodiments of the present invention, referring to Figures 1, 2, 3, 4 and 5, is given below.

[0070] The raw material processing system for aluminosilicate-based cementitious material provided by the embodiment of the present invention comprises a homogenization system, a feeding system, a drying and calcination system, and a grinding system arranged successively; said The homogenization system comprises a grinding device and a homogenizing device communicating successively; the feeding system comprises a fuel supply system and a raw material supply system; the fuel supply system comprises a sorting device, a dosing device, and a storage device, wherein the sorting device is located at the head end of the fuel supply system; the raw material supply system comprises a dosing device and a storage device; the drying and calcining system comprises a drying device, a calcining device, and a cooling device communicating successively; the grinding system comprises a grinding device and a powder selection device communicating successively; the drying device comprises from 1 to 9 drying devices arranged in parallel;said cooling device comprises from 1 to 9 cooling devices arranged in series; when the number of cooling devices is > 1, the temperature of each cooling device gradually decreases following the direction of conveying of the raw material;The raw materials are transferred between each device by conveying device. During the processing of the raw materials of the aluminosilicate-based cementitious material, the raw materials are first conveyed to the homogenization device to be homogenized, the homogenized raw materials pass successively through the dosing device, the storage device and, once weighed, reach the drying device to be dried, they are then conveyed to the calcination device to be calcined, pass through the cooling device to be cooled, then through the grinding device to be ground, after passing through the powder selection device, the powder with the conforming grain size is selected.

[0071] In some embodiments, said drying device is a drying chamber 8; the drying chamber 8 may be equipped with helical drying screws.

[0072] In some embodiments, said calcination device is a rotary calcination furnace 13, a standard burner 12 is used to provide heat to said rotary calcination furnace 13.

[0073] In certain embodiments, said calcination device is provided with a smoke chamber, said smoke chamber is located at the terminal end of the calcination device and serves to collect the hot air produced in the raw material processing system and to heat the calcination device.

[0074] In some embodiments, said cooling device comprises a screw conveyor and water cooling jacket 14.

[0075] In some embodiments, a raw material storage device is arranged between said drying device and said calcination device, and serves to store the raw materials after drying.

[0076] In some embodiments, a dosing device is arranged at the outlet of the raw material storage device and is used to weigh the weight of the raw material passing through it.

[0077] In certain embodiments, the raw material storage device is provided with a hot gas outlet, said hot gas outlet communicates with said calcination device, and supplies heat to said calcination device, achieving complete utilization of the system's thermal energy.

[0078] In some embodiments, a finished calcination product storage device is arranged between said cooling device and said grinding device, and serves to store the raw materials after calcination.

[0079] In some embodiments, a dosing device is arranged at the outlet of the finished calcination product storage device and is used to weigh the weight of the finished calcination product.

[0080] In certain embodiments, said grinding device comprises a grinding tube 16, the grinding tube 16 being filled with grinding media. The grinding media are ordinary grinding media, but they may also be steel ball grinding media. When the grinding tube 16 is in operation, under the effect of friction between the grinding media and the material, gravity, and centrifugal force, an ordered and multidimensional cyclic motion is formed. Mutual grinding occurs between the media, the media and the material, and the media and the internal walls of the grinding tube, thus enabling the material to be ground efficiently.The grinding tube 16 is equipped with an air inlet, an air outlet and a manhole; a cooling valve is arranged on the air inlet and serves to control the amount of air entering the grinding tube 16; the air outlet of the grinding tube 16 communicates with the powder selection device and allows hot air to enter the powder selection device; in parallel, the air inlet and outlet of the grinding tube 16 also serve to discharge the ground material and to ventilate; the manhole facilitates the replacement of the grinding body.

[0081] In some embodiments, a dosing device is arranged at the outlet of the grinding device and is used to weigh the weight of the ground product that passes through it.

[0082] In certain embodiments, said grinding device is provided with a supplementary ventilation device to assist the powder selection device by supplementing the required amount of air.

[0083] In certain embodiments, said powder selection device is subsequently provided with a collection device; said collection device includes a dust collector 18.

[0084] In certain embodiments, said powder selection device is provided in its succession with a finished product storage device; said finished product storage device comprises from 1 to 9 finished product storage devices arranged in parallel; said finished product storage device includes a final product storage store.

[0085] In certain embodiments, said powder selection device communicates with the feed inlet of the grinding device, pushing non-conforming materials back to the grinding device for further grinding.

[0086] In certain embodiments, said grinding device includes a pneumatic conveying system connected thereto; said pneumatic conveying system includes a conveying pump 23, a blower, a dosing valve.

[0087] In some embodiments, said blower includes a Roots 22 compressor.

[0088] In some embodiments, the head end of said feeding system includes a feeding device that picks up raw material from the homogenizing device; said feeding system includes a feeding grapple 4.

[0089] In some embodiments, the conveying device is equipped with a dust collection device and / or a fan, used to reduce the dispersion of dust into the outside air during the operating process.

[0090] In some embodiments, the drying device is equipped with a dust collection device and / or a fan to reduce the dispersion of dust into the outside air during the operating process.

[0091] In some embodiments, the drying device is equipped with a dust collection device and / or a fan to reduce the dispersion of dust into the outside air during the operating process.

[0092] In certain embodiments, the finished product storage device is equipped with a dust collection device and / or a fan which, while reducing the dispersion of dust in the outside air during the operating process, helps to unload the material, blow air and homogenize the product.

[0093] The aforementioned conveying device comprises at least one element from among a belt conveyor 2, a screw conveyor 10, an elevator 11, a chute conveyor 19 and a conduit conveyor 6; in a different embodiment, the devices of Conveying and suitable combinations of conveying devices are selected based on the position ratio between each device in the entire system and the condition of the material to be conveyed.

[0094] The aforementioned dosing device comprises at least one element from a weighing scale 20, an impact flowmeter 21, a weighing hopper; in a different embodiment, the appropriate dosing device is selected according to the trajectory of the entire system. Implementation methods 2-27

[0095] The present embodiments provide an aluminosilicate-based cementitious material and its preparation process, using the treatment system of embodiment 1 to calcine the raw material to be calcined, a biofuel being used for the calcination, the treatment system comprising:

[0096] a homogenization system, a feeding system, a drying and calcination system and a grinding system arranged successively; in which the homogenization system comprises a grinder 1 and a raw material homogenization store 3 communicating successively; the feeding system comprises a fuel supply system and a raw material supply system arranged in parallel, the raw material supply system comprises a feed grab 4, a raw material dosing hopper 7 and a conduit conveyor 6 communicating successively; the drying and calcination system comprises a drying chamber 8, a raw material storage store 9, a rotary calcination kiln 13 and a screw conveyor and water-cooled jacket 14 communicating successively;The grinding system comprises a final product storage hopper 15, a grinding tube 16, a selector 17, a dust collector 18, and a final product storage hopper connected successively. The diameter of the raw material grains passing through the grinder 1 is < 45 mm. The drying chamber 8 comprises 3 drying chambers arranged in parallel, the interior of each drying chamber being equipped with helical drying screws. The rotary calcination furnace 13 further comprises a standard burner 12, used to heat the rotary calcination furnace 13. The screw conveyor and water-cooled jacket 14 comprises 3 screw conveyors and water-cooled jackets arranged successively in the direction of cooling of the material conveying.The temperature range is from 30°C to -30°C. Said finished product storage warehouse comprises a first finished product storage warehouse 24, a second finished product storage warehouse 26 and a third finished product storage warehouse 27.

[0097] The feeding system includes a fuel powder sieve 5, a conduit conveyor 6 and a communicating fuel metering hopper 25 successively; the outlet of the fuel dosing hopper 25 communicates with the fuel inlet of the rotary calcination furnace 13.

[0098] A belt conveyor 2 connects respectively the raw material feed and the crusher 1, the crusher 1 and the raw material homogenization warehouse 3, the feed grab 4 and the raw material dosing hopper 7, the fuel feed inlet and the fuel powder screen 5. A feed vehicle is used to transport the raw material to the raw material feed inlet, and to transport the fuel to the fuel feed inlet.

[0099] The outlet of the drying chamber 8 is connected to the feed inlet of the raw material storage store 9 via the screw conveyor 10 and the elevator 11 arranged successively.

[0100] The outlet of the raw material storage store 9 is connected to the feed inlet of the rotary calcination kiln 13 via the screw conveyor 10 and the elevator 11 arranged successively.

[0101] The outlet of the raw material storage store 9 further includes a weighing scale 20 used to weigh the quantities of material exiting, the material passes through the outlet of the raw material storage store 9 and after weighing by the weighing scale 20 enters the rotary calcination furnace 13 through its feed inlet.

[0102] The raw material storage store 9 is equipped with a hot gas outlet, the hot gas outlet communicates with the burner 12, and serves to partially supply heat to the burner 12.

[0103] The rotary calcination furnace 13 is equipped with a tail smoke chamber, hot air from the processing system enters the rotary calcination furnace 13 via the tail smoke chamber, and undergoes heat exchange with the material being calcined in the furnace; the hot air from the processing system consists mainly of the hot air produced in the drying chamber 8.

[0104] The finished calcination product storage store 15 is equipped following it with a weighing scale 20 used to weigh the quantity of material exiting, the material passes through the exit of the finished calcination product storage store 15 and after weighing by the weighing scale 20 enters the feed inlet of the grinding tube 16.

[0105] The grinding tube 16 is filled with grinding media of steel balls. When the grinding tube 16 is in operation, under the effect of friction between the grinding medium and the material, gravity, and centrifugal force, an ordered and multidimensional cyclic motion is formed; mutual grinding occurs between the media, the medium and the material, and the medium and the internal walls of the tube. grinding, which allows for efficient grinding of the material. The grinding tube 16 is equipped with an air inlet, an air outlet, and a manhole; a cooling valve is arranged on the air inlet and serves to control the amount of air entering the grinding tube 16 via the size of the valve opening; the air outlet of the grinding tube 16 communicates with the selector 17 and allows hot air to enter the selector 17; in addition, the air inlet and outlet of the grinding tube 16 also serve to discharge the ground material and to ventilate; the manhole facilitates the replacement of the grinding body; the supplementary valve can be used to supplement the amount of air required by the selector 17.

[0106] The conforming material outlet of the selector 17 communicates with the feed inlet of the collector 18, transporting the conforming material (grain diameter < 45 pm) by airflow into the collector 18; the non-conforming material outlet of the selector 17 communicates with the inlet of the grinding tube 16 via the chute conveyor 19 and the impact flowmeter 21 arranged successively, pushing the non-conforming materials (grain diameter > 45 pm) back to the grinding tube 16 for further grinding.

[0107] The grinding system includes a pneumatic conveying system connected to it; the pneumatic conveying system is used to transport the material, the pneumatic conveying system includes a conveying pump 23, a Roots blower 22, a metering valve; the metering valve is used to control the entry of the final product to the first final product storage warehouse 24, or the second final product storage warehouse 26 or the third final product storage warehouse 27.

[0108] The second final product storage warehouse 26 or the third final product storage warehouse 27 are respectively connected to a Roots blower 22 and a dust collector 18, the first final product storage warehouse 24 is connected to a Roots blower 22 used to unload and blow air into the product warehouse and to homogenize the product.

[0109] The drying chamber 8 of the drying and calcination system, the elevator 11 and the elevator 11 of the grinding system are respectively connected to a Roots blower 22 and a dust collector 18, used to reduce the dispersion of dust into the outside air.

[0110] The specific preparation process comprises the following steps:

[0111] The aforementioned processing system is used to process coal gangue. The coal gangue is first placed in the raw material homogenization warehouse 3 for homogenization; once homogenized, the coal gangue is picked up by the feed grapple 4 and passes successively through the raw material dosing hopper 7, the conveyor 6, and reaches the drying chamber 8 for drying, the coal gangue placed in the raw material storage store 9 is then transported to the rotary calcination kiln 13, the temperature is increased at a rate of 30°C / minute up to 750°C, the heat is retained for 10 minutes for calcination, once calcination is complete the calcined coal gangue is cooled by passing through a screw conveyor and water cooling jacket 14, then placed in the finished calcination product storage store 15;The calcined coal gangue from the finished product storage warehouse 15 is placed in the grinding tube 16 for grinding, then conveyed to the selector 17, the conforming calcined coal gangue powder is transported by airflow to the dust collector 18, the non-conforming calcined coal gangue powder is pushed back to the grinding tube 16 to continue grinding, the calcined coal gangue powder that passes through the dust collector 18 enters the first finished product storage warehouse 24, or the second finished product storage warehouse 26 or the third finished product storage warehouse 27.

[0112] The base material and the alkali activator are obtained by mixing each raw material according to the proportions shown in Table 1, the base material and the alkali activator are mixed, ground to 45 pm and until the amount of negative pressure sieving powder residue does not exceed 10%, the aluminosilicate-based cementitious material is obtained.In which, the chemical composition (%) and the 28-day compressive strength activity index of the calcined coal gangue are shown in Table 2, the chemical composition of the red mud by sintering process is shown in Table 3, the chemical composition (%) of the steel slag is shown in Table 4, the cement clinker used is Portland cement clinker meeting the requirements of GB / T 21372 "Portland cement clinker", its chemical composition (%) is shown in Table 5, the chemical composition (%) of the desulfurization gypsum is shown in Table 6, the chemical composition (%) of the carbide slag is shown in Table 7. Sample Base material (kg) Alkaline activator (kg) Calcined coal gangue Good reds Steel slag Cement clinker Desulfurization gypsum Carbide slag Sodium carbonate Sodium hydroxide Sodium silicate (modulus interval of 1.5) Method of preparation 2 30 30 30 8 2 0 7.62 0 3.2 Method of preparation 3 40 30 20 8 2 0 7.62 0 3.2 Method of preparation 4 40 20 30 8 2 0 7.62 0 3.2 Method of preparation 5 60 20 10 8 2 0 7.62 0 3.2 Method of preparation 6 60 10 20 8 2 0 7.62 0 3.2 Method of realization 7 60 10 5 23 2 0 7.62 0 3.2 Method of realization 8 70 10 5 13 2 0 7.62 0 3.2 Method of realization 9 60 10 5 20 5 0 7.62 0 3.2 Method of realization 10 60 20 10 8 2 0 9.52 0 0 Implementation method 11 60 20 10 8 2 0 0 0 16 Implementation method 12 60 20 10 8 2 0 0 7.1 0 Implementation method 13 60 20 10 8 2 0 4.76 2.13 3.2 Implementation method 14 60 20 10 8 2 0 3.55 8 Implementation method 15 60 20 10 8 2 0 17.0 0 0 Implementation method 16 60 20 10 8 2 0 9.0 0 0.87 Implementation method 17 40 20 10 0 29 1 7.62 0 3.2 Implementation method 18 40 20 10 0 27 3 7.62 0 3.2 Method of realization 19 40 20 10 0 25 5 7.62 0 3.2 Method of realization 20 40 20 10 0 20 10 0 0 0 Method of realization 21 70 10 5 8 5 2 7.62 0 3.2 Method of execution 22 43 30 20 0 5 2 7.62 0 3.2 Method of execution 23 43 10 10 30 5 2 7.62 0 3.2 Method of execution 24 43 10 5 10 30 2 7.62 0 3.2 Method of execution 25 30 0 8 20 40 2 7.62 0 3.2 Method of execution 26 30 10 0 40 17 3 7.62 0 3.2 Method of execution 27 70 10 3 10 0 7 7.62 0 3.2 Comparison 1 10 45 35 2 8 0 7.62 0 3.2 Compar season 2 20 10 10 45 15 0 7.62 0 3.2 Comparison 3 40 20 10 0 15 15 0 0 0 Comparison 4 80 5 5 5 3 2 7.62 0 3.2 Comparison 5 30 5 5 50 5 5 7.62 0 3.2 Comparison 6 30 5 5 5 50 5 7.62 0 3.2

[0114] [Tables2] Raw material 28-day compressive strength activity index Al₂O₃ SiO₂ MgO Fe₂O₃ CaO TiO₂ SO₃ K₂O + Na₂O Calcined carbon gangue 99% 34.28 41.76 0.16 1.81 0.65 5.44 2.22 1.1

[0115] [Tableaux3] Raw material Compressive strength activity index at 28 days A12O3 SiO2 Fe2O3 CaO MgO k2o Na2O SO3 Calcination losses Red clays 65% 8.58 19.73 9.78 38.99 19.92 4.38 10.11

[0116] [T able4] Raw materials CaO SiO2 MgO Fe2O3 CaF2 MnO A12O3 so3 Calcination losses Steel milk 38.71 15.55 5.9 26.48 0.02 2.29 3.72 0.32 3.11

[0117] [Tables5] Raw material CaO MgO A12O3 SiO2 TiO2 Fe2O3 k2o Calcination losses Cement clinker 64.82 3.37 4.11 20.77 0.36 3.36 0.88 1.96

[0118] [Tables] Raw material A12O3 SiO2 p2o5 so3 k2o CaO Fe2O3 MgO Other Calcination losses Desulfuration gypsum n 1.74 2.46 0.02 47.6 0.26 35.13 0.47 0.47 1.06

[0119] [Tables?] Raw material A12O sSiO2 p205 so3 k2o CaO Fe2O3 MgO MnO CaF2 Others Calcinati on losses Carb ure slag 0.83 1.7 1 0.01 0.3 9 0.0 2 71.59 0.17 0.03 0.13 0.14 0.45 24.53 Comparative examples 1-6

[0120] The present comparative examples provide a cementitious material based on aluminosilicate, the difference with embodiment 2 consists in the proportion of raw material and alkali activator used, see Table 1 for the specific quantities used. Trial 1

[0121] The aluminosilicate-based cementitious material obtained in the present embodiments and comparative examples is formed by mixing in accordance with GB / T17671-1999 "Method for testing the strength of cement mortar (ISO Method)", and is kept in water: the sand and cement test is carried out at 20°C ± 2°C, relative humidity not less than 90% in curing molds for 1 day before mold removal, the mold shrinkage test is carried out at 20°C ± 1°C by curing in water for up to 28 days, the compressive strength is measured, see Table 8. Compressive strength 3d / MPa 7d / MPa 28d / MPa Embodiment 2 27.4 32.7 39.2 Embodiment 3 28.4 33.4 42.1 Embodiment 4 29.5 35.0 43.6 Embodiment 5 29.7 37.1 47.4 Embodiment 6 30.7 38.5 48.2 Embodiment 7 33.3 42.2 52.0 Embodiment 8 30.1 39.2 50.2 Embodiment 9 30.4 40.6 51.5 Embodiment 10 28.3 36.9 46.2 Embodiment 11 29.5 36.9 45.6 Embodiment 12 28.9 35.5 43.0 Embodiment 13 29.2 35.9 44.8 Embodiment 14 28.7 35.6 43.1 Embodiment 15 30.6 38.4 42.2 Embodiment 16 29.0 35.3 45.4 Embodiment 17 33.8 42.2 53.9 Embodiment 18 34.2 44.5 59.8 Embodiment 19 34.6 46.1 60.2 Embodiment 20 19.6 32.1 50.5 Embodiment 21 37.8 47.9 62.6 Embodiment 22 35.9 45.5 59.5 Embodiment 23 32.5 42.3 56.8 Embodiment 24 32.9 43.8 57.2 Embodiment 25 30.5 38.7 50.5 Embodiment 26 27.6 35.9 48,3. Implementation method 27 27.9 37.2 48.6 Comparative example 1 8.9 14.5 25.6 Comparative example 2 15.6 20.5 30.1 , Comparative example 3: 8.4, 13.6, 22.8 Comparative example 4: 20.0, 24.5, 32.3 Comparative example 5: 21.0, 25.5, 33.6 Comparative example 6: 9.8, 16.0, 28.2

[0123] We observe from Table 8 that, compared with the comparative examples whose raw material quantities are not covered by the scope defined by this application, the strength formation of the aluminosilicate-based cementitious material obtained in embodiments whose raw material quantities are covered by the scope defined by this application is rapid, its final strength is high, and its use effects are better. Test 2

[0124] The setting time and stability of the aluminosilicate-based cementitious material obtained in the present embodiments were tested in accordance with the standard "Test method for water requirements for Portland cement of normal consistency, setting time and stability" (GB / T1346-2011), see data in Table 9, all results meet the criteria of the national standard GB175-2020 on cement.

[0125] [Tables9] Sample Setting Time (min) Stability (Le Chatelier Method) Initial Setting Time Final Setting Time Growth Distance / mm Result Method of Preparation 2 45 90 1.5 Compliant Method of Preparation 3 50 85 1.2 Compliant Method of Preparation 4 55 90 1.4 Compliant Method of Preparation 5 40 75 1.2 Compliant Method of Preparation 6 45 80 1.6 Compliant Method of Preparation 7 38 65 0.5 Compliant Method of Preparation 8 48 85 1.1 Compliant Method of Preparation 9 45 70 1.5 Compliant Method of Preparation 10 125 289 1.2 Compliant Method of Preparation 11 15 35 1.5 Compliant Method of Preparation 12 25 55 1.8 Compliant Implementation method 13 40 65 1.3 Compliant Implementation method 14 20 40 1.2 Compliant Implementation method 15 50 120 1.6 Compliant Implementation method 16 60 155 1.8 Compliant Implementation method 17 75 210 0.6 Compliant Implementation method 18 90 236 0.7 Compliant Implementation method 19 120 254 1.1 Compliant Implementation method 20 150 301 0.8 Compliant Implementation method 21 68 135 68 Compliant Implementation method 22 75 128 75 Compliant Implementation method 23 83 135 83 Compliant Implementation method 24 60 113 60 Compliant Implementation method 25 68 120 68 Compliant Implementation method 26 57 98 57 Compliant Implementation method 27 72 128 72 Compliant Comparative example 1 68 105 68 Compliant Comparative Example 2 190 400 190 Compliant Comparative Example 3 85 53 85 Compliant Comparative Example 4 70 83 70 Compliant Comparative Example 5 60 98 60 Compliant Comparative example: 6 100 255 100 Conforms

[0126] We observe from Table 9 that the stability of the aluminosilicate-based cementitious material obtained in the embodiments of the present application is excellent, although in some embodiments the setting time is relatively long, the material meets the criteria for use in concrete engineering.

[0127] Of course, the aforementioned embodiments are merely examples intended to clarify the operations and do not constitute a limitation on the embodiments. Based on the above description, a person skilled in the art can make various modifications and variations. It is neither necessary nor possible to describe all the possibilities here. All modifications and variations that are clearly inspired by it are covered by the scope of protection of the creation of the present invention.

Claims

Demands

1. Aluminosilicate-based cementitious material, characterized in that it comprises a base material and an alkali activator, said base material comprising in mass percentage the following raw materials: 30-70% calcined coal gangue, 0-30% red mud, 0-30% steel slag, 0-40% cement clinker, 0-40% gypsum, 0-10% carbide slag; wherein said red muds are calcined red muds or uncalcined red muds.

2. Aluminosilicate-based cementitious material according to claim 1, characterized in that said alkali activator comprises at least one element among sodium carbonate, sodium silicate and sodium hydroxide; optionally, said alkali activator has a mass ratio of 1-8:2-9 of sodium carbonate and sodium silicate; and / or, in the case of external addition, calculated in Na2O, the mass of said alkali activator is less than 11% of the mass of said base material; and / or, said base material comprises in mass percentage the following raw materials: 40-70% calcined coal gangue, 10-30% red mud, 5-20% steel slag, 0-30% cement clinker, 5-30% gypsum and 1-2% carbide slag.

3. Aluminosilicate-based cementitious material according to any one of claims 1 and 2, characterized in that said calcined coal gangue comprises in mass percentage: A12O3 > 20%, CaO < 5%, SO3 < 5%, Al / Si > 0.

5.

4. Aluminosilicate-based cementitious material according to claim 3, characterized in that said calcined coal gangue comprises by mass percentage: A12O3 > 25%, the 28-day compressive strength activity index of said calcined coal gangue being > 85%.

5. Aluminosilicate-based cementitious material according to claim 3, characterized in that said calcined coal gangue comprises in mass percentage: A12O3: 30-40%, SiO2: 40-65%, K2O + Na2O < 3%, CaO + MgO < 5%, SO3 < 3%, the 28-day compressive strength activity index being > 95%.

6. Aluminosilicate-based cementitious material according to any one of claims 3 to 5, characterized in that said red muds comprise in mass percentage: A12O3 > 6.0%, SiO2 > 10.0%, the 28-day compressive strength activity index of said red muds being > 60%.

7. Aluminosilicate-based cementitious material according to claim 6, characterized in that said red muds comprise in mass percentage: Al2O3: 8.0-25%, SiO2: 15.0-30%, Fe2O3: 5-15%, CaO: 5.0-50%, MgO: 0.1-2%, K2O: 0.001-1%, Na2O: 2-8%, SO3 < 5%.

8. Aluminosilicate-based cementitious material according to any one of claims 3 to 7, characterized in that said steel slag comprises in mass percentages: CaO: 30-60%, SiO2: 10-30%, MgO: 2-20%, Fe2O3: 10-40%; optionally, said steel slag comprises in mass percentages: CaO: 38-50%, Fe2O3: 25-35%, SiO2: 14-20%, MgO: 4.5-12%, Al2O3: 1-10%, MnO < 5%, CaF2 < 2%, SO3 < 5%.

9. Aluminosilicate-based cementitious material according to any one of claims 3 to 8, characterized in that said cement clinker is Portland cement clinker.

10. Aluminosilicate-based cementitious material according to any one of claims 3 to 9, characterized in that said gypsum is at least one element among desulfurization gypsum, mirabilite gypsum, phosphogypsum and titanium gypsum.

11. Aluminosilicate-based cementitious material according to any one of claims 3 to 10, characterized in that said carbide slag comprises in mass percentage: CaO: 65-98%, SiO2: 1-10%, Al2O3: 0-5%, Fe2O3: 0-10%; optionally, said carbide slag comprises in mass percentage: CaO: 90-98%, Fe2O3: 0-3%, SiO2: 1-5%, Al2O3: 0-3%, MgO: < 1%, MnO < 1%, CaF2 < 1%, SO3 < 1%.

12. A process for preparing aluminosilicate-based cementitious material according to any one of claims 1 to 11, characterized in that it comprises the following steps: mixing said raw materials in mass percentages to obtain said base material; adding said alkaline activator to obtain the aluminosilicate-based cementitious material; or, mix the said raw materials and the said alkaline activator according to mass percentages in order to obtain the aluminosilicate-based cementitious material.

13. A process for preparing aluminosilicate-based cementitious material according to claim 12, characterized in that it comprises a step of drying said raw materials before preparation; and / or, once said base material has been obtained, and after adding said alkali activator or after mixing said base material with said alkali activator, it further comprises a grinding step; optionally, after grinding it comprises a sieving step to prepare grains of diameter < 45 pm.

14. A process for preparing aluminosilicate-based cementitious material according to claim 12 or 13, characterized in that said calcined coal gangue and said calcined red muds are obtained by processing using a raw material processing system for aluminosilicate-based cementitious material; optionally, the fuel used during the preparation includes biofuel; and / or, the heating rate of said calcined coal gangue during calcination is 1-50°C / minute, the calcination temperature is 600-1000°C, the heat retention time is 0-60 minutes; and / or, the heating rate of said calcined red mud during calcination is 1-50°C / minute, the calcination temperature is 600-1000°C, the heat retention time is 0-60 minutes;in which the raw material processing system comprises a homogenization system, a feeding system, a drying and calcination system and a grinding system arranged successively; said homogenization system comprises a grinding device and a homogenizing device communicating successively; said feeding system comprises a fuel supply system and a raw material supply system; said fuel supply system comprises a sorting device, a dosing device and a storage device, in which said sorting device is located at the head end of said; fuel supply system; said raw material supply system includes a dosing device and a storage device; said drying and calcination system includes a drying device, a calcination device and a cooling device communicating successively; said grinding system includes a grinding device and a powder selection device communicating successively; said drying device includes from 1 to 9 drying devices arranged in parallel; said cooling device includes from 1 to 9 cooling devices arranged in series; when the number of cooling devices is > 1, the temperature of each cooling device decreases progressively following the direction of conveying the raw material.

15. Method according to claim 14, characterized in that said drying device comprises a drying chamber.

16. A method according to claim 14 or 15, characterized in that said calcination device comprises a rotary calcination furnace; optionally, a burner is used to provide heat to said rotary calcination furnace.

17. A method according to any one of claims 14 to 16, characterized in that said calcination device is provided with a smoke chamber, said smoke chamber being located at the terminal end of the calcination device and serving to collect the hot air produced in the raw material processing system and to heat the calcination device.

18. A method according to any one of claims 14 to 17, characterized in that said cooling device comprises a screw conveyor and water cooling jacket.

19. A method according to any one of claims 14 to 18, characterized in that a raw material storage device is arranged between said drying device and said calcination device, and serves to store the raw materials after drying; optionally, a dosing device is arranged at the outlet of the raw material storage device; optionally, the raw material storage device is provided with an outlet of hot gases, said hot gas outlet communicates with said calcination device.

20. A method according to any one of claims 14 to 19, characterized in that a finished calcination product storage device is arranged between said cooling device and said grinding device, and serves to store the raw materials after calcination; optionally, a dosing device is arranged at the outlet of the finished calcination product storage device.

21. A method according to any one of claims 14 to 20, characterized in that said grinding device comprises a grinding tube.

22. A method according to any one of claims 14 to 21, characterized in that a dosing device is arranged at the outlet of the grinding device.

23. A method according to any one of claims 14 to 22, characterized in that said grinding device is provided with a supplementary ventilation device.

24. A method according to any one of claims 14 to 23, characterized in that said powder selection device is subsequently provided with a collection device; optionally, said collection device includes a dust collector.

25. A method according to any one of claims 14 to 24, characterized in that said powder selection device is provided in its continuation with a finished product storage device; optionally, said finished product storage device comprises from 1 to 9 finished product storage devices arranged in parallel; optionally, said finished product storage device comprises a finished product storage warehouse.

26. A method according to any one of claims 14 to 25, characterized in that said powder selection device communicates with the feed inlet of the grinding device, pushing non-conforming materials back to the grinding device for further grinding.

27. ​​A method according to any one of claims 14 to 26, characterized in that said grinding device comprises a pneumatic conveying system connected thereto; optionally, said pneumatic conveying system comprises a conveying pump, a blower, a dosing valve; optionally, said blower includes a Roots compressor.

28. A method according to any one of claims 14 to 27, characterized in that the head end of said feeding system comprises a feeding device that picks up raw material from the homogenizing device; optionally, said feeding system comprises a feeding grapple.

29. A method according to any one of claims 14 to 28, characterized in that the raw materials are transferred between each device by means of a transfer device; optionally, said transfer device comprises at least one element from a belt conveyor, a screw conveyor, an elevator, a chute conveyor and a conduit conveyor.

30. A method according to any one of claims 14 to 29, characterized in that said fuel supply system dosing device, said raw material supply system dosing device, said dosing device arranged at the outlet of the raw material storage device, said dosing device arranged at the outlet of the finished calcined product storage device, and said dosing device arranged at the outlet of the grinding device comprise at least one element among a weighing scale, an impact flowmeter, a weighing hopper; and / or, the transfer device is equipped with a dust collection device and / or a fan; and / or, the drying device is equipped with a dust collection device and / or a fan; and / or, the finished product storage device is equipped with a dust collection device and / or a fan.

31. Use of said aluminosilicate-based cementitious material according to any one of claims 1 to 11, or of the aluminosilicate-based cementitious material obtained using said preparation process according to any one of claims 12 to 30, as a construction material.

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