Method for preparing high-modulus silicate from active silicon dioxide
By pretreating silica materials and reacting with quartz sand powder, strong alkali, etc., high-modulus silicate is prepared, which solves the problem of difficult modulus control in wet sodium silicate production, and achieves high-efficiency and low-cost high-modulus silicate production.
Patent Information
- Application Number
- CN202510065240.8
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-16
- Publication Date
- 2025-05-09
AI Technical Summary
The existing wet sodium silicate production methods are difficult to control the modulus, resulting in unstable product quality and high production costs.
By obtaining the silica material and pretreatment, foreign matter and magnetic substances are removed to obtain active silica powder. Then, the quartz sand powder was mixed with strong alkali and water and reacted to prepare a wet silicate liquid. The active silica powder is mixed with a wet silicate liquid and reacted under controlled temperature conditions to obtain a high modulus silicate liquid.
The preparation of high-modulus silicate is achieved, and the problem that wet sodium silicate can only produce low-modulus sodium silicate is overcome, which reduces production costs, improves product quality, and has low energy consumption.
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Figure CN119954167A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of inorganic silicide production, in particular to a method for preparing high modulus silicate by using active silicon dioxide. Background Art
[0002] Silica ash, also known as microsilica powder, is a byproduct of SiO2 and Si vapor produced in the ore-fired electric furnace when ferroalloys are smelting ferrosilicon and industrial silicon (metallic silicon). The byproducts are rapidly oxidized with air after being discharged, and are collected and cooled. The SiO2 content is high and it is active silicon dioxide. However, there are a lot of impurities in silica ash and the composition is complex. Rice husk ash, also known as rice husk charcoal, is an ash with a high silicon dioxide content produced by incineration or thermal decomposition of rice husks as raw materials. The silicon dioxide has a porous and active structure. White carbon black waste is mainly waste with a high silicon dioxide content collected from waste gas, wastewater, and scraps in the process of producing white carbon black. The silicon dioxide has a porous and active structure. Sodium silicate, commonly known as water glass or sodium silicate, is the basic raw material of silicon compounds. It is used in the chemical industry to manufacture various silicate products such as silica gel, white carbon black, zeolite molecular sieve, sodium metasilicate, silica sol, layered silicon and instant powdered sodium silicate, potassium sodium silicate, etc.
[0003] At present, there are two main methods for producing sodium silicate: dry method and wet method. The wet method has a simple production process and requires less investment in production and operation, but the product modulus is difficult to control and is low (generally 2.2-2.5), and the quality is unstable. The dry method can produce sodium silicate of various moduli, and the product has a wide range of uses, but the production investment is large and the production cost is high. Summary of the invention
[0004] In view of this, the purpose of the present invention is to provide a method for preparing high modulus silicate using active silicon dioxide.
[0005] In order to achieve the above technical objectives, the technical solution adopted by the present invention is:
[0006] The present invention provides a method for preparing high modulus silicate using active silicon dioxide, comprising:
[0007] Obtaining silica material, pre-treating the silica material to remove foreign matter and magnetic substances in the silica material, and obtaining active silica powder;
[0008] The quartz sand powder is mixed with a strong base and water in a first preset mass ratio, and the mixture is introduced into a first reactor, the reaction temperature in the first reactor is controlled to be 150-200° C., and the mixture is reacted in the first reactor for 6-16 hours. After the reaction in the first reactor is completed, the mixture is cooled to 100° C. and filtered to obtain a wet silicate liquid, wherein the modulus N of the wet silicate liquid is 1.0-3.0, the molecular formula is Na2O·NSiO2 or K2O·NSiO2, and the SiO2 content of the wet silicate liquid is 1-20%;
[0009] The active silicon dioxide powder and the wet silicate liquid are uniformly mixed according to a second preset mass ratio to obtain a mixed slurry;
[0010] The mixed slurry is transported to the second reactor, the reaction temperature is controlled at 85-200°C in the second reactor to react for 1-12 hours, and after the reaction in the second reactor is completed, it is filtered to obtain a high modulus silicate liquid, the modulus M of the high modulus silicate liquid is 2.5-5.0, the molecular formula is Na2O·MSiO2 or K2O·MSiO2, and the SiO2 content of the high modulus silicate liquid is 10-30%.
[0011] In some embodiments, pre-treating the silicon dioxide material to remove foreign matter and magnetic substances in the silicon dioxide material includes:
[0012] The silicon dioxide material is conveyed to a cyclone separator to remove foreign matter, thereby obtaining a first powder;
[0013] The first powder is subjected to electromagnetic or strong magnetic separation to remove magnetic substances, thereby obtaining a second powder, which is active silica powder.
[0014] In some embodiments, the silica material is one or more of silica ash, microsilica powder, rice husk ash, white carbon black waste, and silica gel waste, and the mesh size of the silica material is over 80 mesh, 100 mesh, or 200 mesh.
[0015] In some embodiments, the mesh size of the quartz sand powder is over 80 mesh, 100 mesh or 140 mesh, and the SiO2 content of the quartz sand powder is 98% or above; the strong base is sodium hydroxide or potassium hydroxide.
[0016] In some embodiments, cooling to 100° C. and filtering after the reaction in the first reaction kettle is completed further comprises:
[0017] After the reaction in the first reactor is completed, the slurry in the first reactor is transferred to the transition tank by utilizing the residual pressure of the first reactor, and is cooled to less than 100° C. by liquid-liquid heat exchange, and is filtered through a filter after cooling.
[0018] In some embodiments, the first preset mass ratio is expressed by formula (1), which is as follows:
[0019] SiO2:NaOH:H2O=1:0.4~1.4:20~100;
[0020] Alternatively, the first preset mass ratio is expressed by formula (2), which is as follows:
[0021] SiO2:KOH:H2O=1:1.2~1.9:10~100;
[0022] The second preset mass ratio is expressed by formula (3), which is as follows:
[0023] SiO2:Na2O:NSiO2=1:0.5~2:10~90;
[0024] Alternatively, the second preset mass ratio is expressed by formula (4), which is as follows:
[0025] SiO2:K2O:NSiO2=1:0.5~2.5:90.
[0026] In some embodiments, the first reactor is a pressure reactor, which is configured to be heated to 150-200°C by passing steam; the second reactor is a pressure reactor or a normal pressure reactor, which is configured to be heated to 85-200°C by passing steam or using indirect heat exchange.
[0027] In some embodiments, the high modulus silicate liquid is a high modulus sodium silicate liquid or a high modulus potassium silicate liquid.
[0028] In some embodiments, mixing quartz sand powder, strong alkali, and water in a first preset mass ratio comprises:
[0029] Putting quartz sand powder, strong alkali and water into a first stirred reactor according to a first preset mass ratio and mixing them evenly;
[0030] The active silicon dioxide powder and the wet silicate liquid are mixed uniformly according to a second preset mass ratio to obtain a mixed slurry comprising:
[0031] The active silicon dioxide powder and the wet-process silicate liquid are input into the second stirred reactor according to a second preset mass ratio and mixed evenly to obtain a mixed slurry.
[0032] In some embodiments, the high modulus silicate solution is used to produce an inorganic silicide product, and the inorganic silicide product includes any one of sodium silicate, potassium silicate, potassium sodium silicate, sodium metasilicate, white carbon black, silica gel, silica sol, and molecular sieve.
[0033] Different from the prior art, in the above technical scheme, by obtaining a silica material, the silica material is pretreated to remove foreign matter and magnetic substances in the silica material to obtain an active silica powder; the quartz sand powder is mixed with a strong base and water in a first preset mass ratio, and introduced into a first reactor, the reaction temperature in the first reactor is controlled to be 150-200° C., and the reaction is carried out in the first reactor for 6-16 hours, and after the reaction in the first reactor is completed, the temperature is lowered to 100° C. and filtered to obtain a wet silicate liquid, the modulus N of the wet silicate liquid is 1.0-3.0, and the molecular formula is Na2O·NSiO2 or K2O·NSiO2, the SiO2 content of the wet silicate liquid is 1-20%; the active silicon dioxide powder and the wet silicate liquid are uniformly mixed according to a second preset mass ratio to obtain a mixed slurry; the mixed slurry is conveyed to a second reactor, the reaction temperature is controlled to be 85-200°C in the second reactor for reaction for 1-12h, and after the reaction in the second reactor is completed, it is filtered to obtain a high modulus silicate liquid, the modulus M of the high modulus silicate liquid is 2.5-5.0, the molecular formula is Na2O·MSiO2 or K2O·MSiO2, and the SiO2 content of the high modulus silicate liquid is 10-30%.
[0034] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:
[0035] 1. The present invention utilizes industrial by-product silicon dioxide as raw material to produce high modulus silicate, thereby realizing high value utilization. The activation degree of silicon dioxide in active silicon dioxide is extremely high, and it is easy to react with wet silicate solution. The silicon dioxide dissolution rate is high and the energy consumption is low.
[0036] 2. The present invention overcomes the problem that wet-process sodium silicate can only produce low-modulus sodium silicate. The active silicon dioxide produced as an industrial by-product is reacted with the wet-process sodium silicate liquid to obtain a high-modulus sodium silicate liquid through gradient preparation. A strong base is not directly used to react with it, which can greatly save production costs, has a simple production process, controllable product quality, and is easy to achieve large-scale production. BRIEF DESCRIPTION OF THE DRAWINGS
[0037] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.
[0038] Figure 1 It is a flowchart of the production method. DETAILED DESCRIPTION
[0039] The present invention will be further described in detail below in conjunction with the accompanying drawings and examples. It is particularly noted that the following examples are only used to illustrate the present invention, but are not intended to limit the scope of the present invention. Similarly, the following examples are only partial embodiments of the present invention rather than all embodiments, and all other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention.
[0040] See also Figure 1 This embodiment provides a method for preparing high modulus silicate using active silicon dioxide, comprising:
[0041] Obtaining silica material, pre-treating the silica material to remove foreign matter and magnetic substances in the silica material, and obtaining active silica powder;
[0042] The quartz sand powder is mixed with a strong base and water in a first preset mass ratio, and the mixture is introduced into a first reactor, the reaction temperature in the first reactor is controlled to be 150-200° C., and the mixture is reacted in the first reactor for 6-16 hours. After the reaction in the first reactor is completed, the mixture is cooled to 100° C. and filtered to obtain a wet silicate liquid, wherein the modulus N of the wet silicate liquid is 1.0-3.0, the molecular formula is Na2O·NSiO2 or K2O·NSiO2, and the SiO2 content of the wet silicate liquid is 1-20%;
[0043] The active silicon dioxide powder and the wet silicate liquid are uniformly mixed according to a second preset mass ratio to obtain a mixed slurry;
[0044] The mixed slurry is transported to the second reactor, the reaction temperature is controlled at 85-200°C in the second reactor to react for 1-12 hours, and after the reaction in the second reactor is completed, it is filtered to obtain a high modulus silicate liquid, the modulus M of the high modulus silicate liquid is 2.5-5.0, the molecular formula is Na2O·MSiO2 or K2O·MSiO2, and the SiO2 content of the high modulus silicate liquid is 10-30%.
[0045] In this embodiment, the silicon dioxide material is industrial waste generated in industrial production, including one or more of silica ash, microsilica powder, rice husk ash, white carbon black waste, silica gel waste or other active silicon dioxide. Pre-treating the silicon dioxide material can be understood as removing impurities and magnetic substances in the silicon dioxide material, so as to facilitate the subsequent process and improve the preparation efficiency.
[0046] Further, the quartz sand powder is uniformly mixed with a strong base and water, and a wet silicate liquid is prepared using a wet silicate preparation method. It should be noted that this step produces a low modulus wet silicate liquid. In addition, in this embodiment, the type of wet silicate is compatible with the type of strong base, for example, when the strong base is sodium hydroxide, the wet silicate is wet sodium silicate, and when the strong base is potassium hydroxide, the wet silicate is wet potassium silicate.
[0047] In this embodiment, the active silica powder has high activity. When encountering a wet silicate liquid, under the action of the temperature of the second reactor, the active silica powder reacts with the wet silicate to obtain a high modulus silicate liquid. Compared with the wet silicate obtained by directly reacting a strong alkali with the active silica powder in the prior art, the modulus of the silicate liquid shown in this embodiment is higher, thereby improving the cost-effectiveness of the active silica powder product.
[0048] In some embodiments, pre-treating the silicon dioxide material to remove foreign matter and magnetic substances in the silicon dioxide material includes:
[0049] The silicon dioxide material is conveyed to a cyclone separator to remove foreign matter, thereby obtaining a first powder;
[0050] The first powder is subjected to electromagnetic or strong magnetic separation to remove magnetic substances, thereby obtaining a second powder, which is active silica powder.
[0051] For the convenience of distinction, the silicon dioxide material after removing foreign matter is recorded as the first powder, and the first powder after electromagnetic magnetic separation is recorded as the second powder. This process can effectively remove impurities in the silicon dioxide material, which is convenient for subsequent reactions.
[0052] In some embodiments, the silica material is one or more of silica ash, microsilica powder, rice husk ash, white carbon black waste, and silica gel waste, and the mesh size of the silica material is over 80 mesh, 100 mesh, or 200 mesh.
[0053] In some embodiments, the mesh size of the quartz sand powder is over 80 mesh, 100 mesh or 140 mesh, and the SiO2 content of the quartz sand powder is 98% or above; the strong base is sodium hydroxide or potassium hydroxide.
[0054] In some embodiments, cooling to 100° C. and filtering after the reaction in the first reaction kettle is completed further comprises:
[0055] After the reaction in the first reactor is completed, the slurry in the first reactor is transferred to the transition tank by utilizing the residual pressure of the first reactor, and is cooled to less than 100° C. by liquid-liquid heat exchange, and is filtered through a filter after cooling.
[0056] In some embodiments, the first preset mass ratio is expressed by formula (1), which is as follows:
[0057] SiO2:NaOH:H2O=1:0.4~1.4:20~100;
[0058] Alternatively, the first preset mass ratio is expressed by formula (2), which is as follows:
[0059] SiO2:KOH:H2O=1:1.2~1.9:10~100;
[0060] The second preset mass ratio is expressed by formula (3), which is as follows:
[0061] SiO2:Na2O:NSiO2=1:0.5~2:10~90;
[0062] Alternatively, the second preset mass ratio is expressed by formula (4), which is as follows:
[0063] SiO2:K2O:NSiO2=1:0.5~2.5:90.
[0064] In some embodiments, the first reactor is a pressure reactor, which is configured to be heated to 150-200°C by passing steam; the second reactor is a pressure reactor or a normal pressure reactor, which is configured to be heated to 85-200°C by passing steam or using indirect heat exchange.
[0065] In some embodiments, the high modulus silicate liquid is a high modulus sodium silicate liquid or a high modulus potassium silicate liquid.
[0066] In some embodiments, mixing quartz sand powder, strong alkali, and water in a first preset mass ratio comprises:
[0067] Putting quartz sand powder, strong alkali and water into a first stirred reactor according to a first preset mass ratio and mixing them evenly;
[0068] The active silicon dioxide powder and the wet silicate liquid are mixed uniformly according to a second preset mass ratio to obtain a mixed slurry comprising:
[0069] The active silicon dioxide powder and the wet-process silicate liquid are input into the second stirred reactor according to a second preset mass ratio and mixed evenly to obtain a mixed slurry.
[0070] In some embodiments, the high modulus silicate solution is used to produce an inorganic silicide product, and the inorganic silicide product includes any one of sodium silicate, potassium silicate, potassium sodium silicate, sodium metasilicate, white carbon black, silica gel, silica sol, and molecular sieve.
[0071] Different from the prior art, in the above technical scheme, by obtaining a silica material, pre-treating the silica material to remove foreign matter and magnetic substances in the silica material, an active silica powder is obtained; the quartz sand powder is evenly mixed with a strong base and water according to a first preset mass ratio, and introduced into a first reactor, the reaction temperature in the first reactor is controlled to be 150-200° C., and the reaction is carried out in the first reactor for 6-16 hours, and after the reaction in the first reactor is completed, the temperature is lowered to 100° C. and filtered to obtain a wet silicate liquid, and the wet silicate liquid is molded The number N is 1.0-3.0, and the SiO2 content of the wet silicate liquid is 1-20%; the active silicon dioxide powder and the wet silicate liquid are uniformly mixed according to a second preset mass ratio to obtain a mixed slurry; the mixed slurry is conveyed to a second reactor, the reaction temperature in the second reactor is controlled to be 85-200°C for reaction for 1-12 hours, and after the reaction in the second reactor is completed, it is filtered to obtain a high modulus silicate liquid, the modulus M of the high modulus silicate liquid is 2.5-5.0, and the SiO2 content of the high modulus silicate liquid is 10-30%.
[0072] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art:
[0073] 1. The present invention utilizes industrial by-product silicon dioxide as raw material to produce high modulus silicate, thereby realizing high value utilization. The activation degree of silicon dioxide in active silicon dioxide is extremely high, and it is easy to react with wet silicate solution. The silicon dioxide dissolution rate is high and the energy consumption is low.
[0074] 2. The present invention overcomes the problem that wet-process sodium silicate can only produce low-modulus sodium silicate. The active silicon dioxide produced as an industrial by-product is reacted with the wet-process sodium silicate liquid to obtain a high-modulus sodium silicate liquid through gradient preparation. A strong base is not directly used to react with it, which can greatly save production costs, has a simple production process, controllable product quality, and is easy to achieve large-scale production.
[0075] Specific example 1:
[0076] A method for preparing high modulus silicate using active silicon dioxide comprises the following steps:
[0077] (1) Pretreatment: The silica material is separated by a cyclone to remove foreign matter, and then separated by electromagnetic or strong magnetic separation to remove magnetic matter, to obtain active silica powder with a mesh size of 80;
[0078] (2) Preparation of wet silicate: quartz sand powder with a mesh size of 80 and a SiO2 content of more than 98% is added to a first stirred reactor in a certain mass ratio with a strong base and water, and mixed evenly, and then pumped to a pressure reactor (i.e., the first reactor) via a slurry pump, and steam is introduced to increase the temperature, and the reaction is controlled to be at a temperature of 150-200° C. for 6-16 hours. After the reaction is completed, the residual pressure of the pressure reactor (i.e., the first reactor) is used to transfer to a transition tank, and then the temperature is reduced to less than 100° C. by liquid-liquid heat exchange, and finally pumped to a filter for direct filtration via a slurry pump to obtain a wet silicate liquid with a modulus of 1.0-3.0 and a SiO2 content of 1-20%;
[0079] (3) batching: adding the active dioxide powder of step (1) and the wet silicate liquid of step (2) into a second stirred reactor in a certain mass ratio and mixing them evenly to obtain a mixed slurry;
[0080] (4) Preparation of high modulus silicate: The mixed slurry of step (3) is pumped to a normal pressure or pressure reactor (i.e., the second reactor), and the temperature is increased by adding steam or indirect heat exchange, and the reaction temperature is controlled to be 85-200°C for 1-12 hours. Finally, the mixed slurry is pumped to a filter for direct filtration to obtain a high modulus silicate liquid with a modulus of 2.5-5.0 and a SiO2 content of 10-30%.
[0081] Specific example 2:
[0082] A method for preparing high modulus silicate using active silicon dioxide comprises the following steps:
[0083] (1) Pretreatment: The silica material is separated by a cyclone to remove foreign matter, and then separated by electromagnetic or strong magnetic separation to remove magnetic matter, to obtain active silica powder with a mesh size of more than 100;
[0084] (2) Preparation of wet silicate: quartz sand powder with a mesh size of 100 and a SiO2 content of more than 98% is added to a first stirred reactor in a certain mass ratio with a strong base and water, and mixed evenly. The mixture is then pumped to a pressure reactor (i.e., the first reactor) via a slurry pump, and steam is introduced to increase the temperature. The reaction is controlled to be at a temperature of 180 to 190° C. for 7 to 12 hours. After the reaction is completed, the residual pressure of the pressure reactor (i.e., the first reactor) is transferred to a transition tank, and then cooled to less than 95° C. via liquid-liquid heat exchange. The mixture is finally pumped to a filter via a slurry pump for direct filtration to obtain a wet silicate liquid with a modulus of 1.0 to 2.5 and a SiO2 content of 10 to 15%.
[0085] (3) batching: adding the active dioxide powder of step (1) and the wet silicate liquid of step (2) into a second stirred reactor in a certain mass ratio and mixing them evenly to obtain a mixed slurry;
[0086] (4) Preparation of high modulus silicate: The mixed slurry of step (3) is pumped to a normal pressure or pressure reactor (i.e., the second reactor), and the temperature is increased by adding steam or indirect heat exchange, and the reaction temperature is controlled to be 150-180°C for reaction for 5-10 hours. Finally, the mixed slurry is pumped to a filter for direct filtration to obtain a high modulus silicate liquid with a modulus of 3-4.5 and a SiO2 content of 12-25%.
[0087] Specific example 3:
[0088] A method for preparing high modulus silicate using active silicon dioxide comprises the following steps:
[0089] (1) Pretreatment: The silica material is separated by a cyclone to remove foreign matter, and then separated by electromagnetic or strong magnetic separation to remove magnetic matter, to obtain active silica powder with a mesh size of more than 200;
[0090] (2) Preparation of wet silicate: quartz sand powder with a mesh size of 150 and a SiO2 content of more than 98% is added to a first stirred reactor in a certain mass ratio with a strong base and water, and mixed evenly, and then pumped to a pressure reactor (i.e., the first reactor) via a slurry pump, and steam is introduced to increase the temperature, and the reaction is controlled to be at a temperature of 180-200° C. for 10-16 hours. After the reaction is completed, the residual pressure of the pressure reactor (i.e., the first reactor) is used to transfer to a transition tank, and then the temperature is reduced to less than 100° C. by liquid-liquid heat exchange, and finally pumped to a filter for direct filtration via a slurry pump to obtain a wet silicate liquid with a modulus of 1.8-3.0 and a SiO2 content of 15-20%;
[0091] (3) batching: adding the active dioxide powder of step (1) and the wet silicate liquid of step (2) into a second stirred reactor in a certain mass ratio and mixing them evenly to obtain a mixed slurry;
[0092] (4) Preparation of high modulus silicate: The mixed slurry of step (3) is pumped to a normal pressure or pressure reactor (i.e., the second reactor), and the temperature is increased by adding steam or indirect heat exchange, and the reaction temperature is controlled to be 120-200°C for 5-12 hours. Finally, the mixed slurry is pumped to a filter for direct filtration to obtain a high modulus silicate liquid with a modulus of 4.5-5.0 and a SiO2 content of 20-30%.
[0093] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.
[0094] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, server, or network device, etc.) or a processor (processor) to perform all or part of the steps of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.
[0095] The above descriptions are only some embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any equivalent device or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.
Claims
1. A method for preparing high modulus silicate from active silicon dioxide, characterized in that: include: Obtaining a silicon dioxide material, and pre-treating the silicon dioxide material to remove foreign matter and magnetic substances in the silicon dioxide material to obtain an active silicon dioxide powder; The quartz sand powder is mixed with a strong base and water in a first preset mass ratio, and the mixture is introduced into a first reactor, the reaction temperature in the first reactor is controlled to be 150-200° C., and the mixture is reacted in the first reactor for 6-16 hours. After the reaction in the first reactor is completed, the mixture is cooled to 100° C. and filtered to obtain a wet silicate liquid, wherein the modulus N of the wet silicate liquid is 1.0-3.0, the molecular formula is Na2O·NSiO2 or K2O·NSiO2, and the SiO2 content of the wet silicate liquid is 1-20%; The active silicon dioxide powder and the wet silicate liquid are uniformly mixed according to a second preset mass ratio to obtain a mixed slurry; The mixed slurry is transported to a second reactor, the reaction temperature is controlled to be 85-200°C in the second reactor, the reaction is carried out for 1-12 hours, and after the reaction in the second reactor is completed, it is filtered to obtain a high modulus silicate liquid, the modulus M of the high modulus silicate liquid is 2.5-5.0, the molecular formula is Na2O·MSiO2 or K2O·MSiO2, and the SiO2 content of the high modulus silicate liquid is 10-30%.
2. The method for preparing high modulus silicate from active silicon dioxide according to claim 1, characterized in that: Pre-treating the silicon dioxide material to remove foreign matter and magnetic substances in the silicon dioxide material includes: The silicon dioxide material is conveyed to a cyclone separator to remove foreign matter, thereby obtaining a first powder; The first powder is subjected to electromagnetic or strong magnetic separation to remove magnetic substances to obtain a second powder, which is the active silica powder.
3. The method for preparing high modulus silicate from active silicon dioxide according to claim 2, characterized in that: The silicon dioxide material is one or more of silicon ash, microsilica powder, rice husk ash, white carbon black waste, and silica gel waste. The mesh number of the silicon dioxide material is over 80 meshes, 100 meshes, or 200 meshes.
4. The method for preparing high modulus silicate from active silicon dioxide according to claim 1, characterized in that: The mesh number of the quartz sand powder is over 80 mesh number, 100 mesh number or 140 mesh number, and the SiO2 content of the quartz sand powder is 98% or above; The strong base is sodium hydroxide or potassium hydroxide.
5. The method for preparing high modulus silicate from active silicon dioxide according to claim 1, characterized in that: After the reaction in the first reactor is completed, the temperature is lowered to 100° C. and filtered, and the steps include: After the reaction in the first reactor is completed, the slurry in the first reactor is transferred to a transition tank using the residual pressure of the first reactor, and is cooled to less than 100° C. by liquid-liquid heat exchange, and filtered through a filter after cooling.
6. The method for preparing high modulus silicate from active silicon dioxide according to claim 1, characterized in that: The first preset mass ratio is expressed by formula (1), which is as follows: SiO2:NaOH:H2O=1:0.4~1.4:20~100; Alternatively, the first preset mass ratio is expressed by formula (2), which is as follows: SiO2:KOH:H2O=1:1.2~1.9:10~100; The second preset mass ratio is expressed by formula (3), which is as follows: SiO2:Na2O:NSiO2=1:0.5~2:10~90; Alternatively, the second preset mass ratio is expressed by formula (4), which is as follows: SiO2:K2O:NSiO2=1:0.5~2.5:
90.
7. The method for preparing high modulus silicate from active silicon dioxide according to claim 1, characterized in that: The first reactor is a pressure reactor, and the first reactor is configured to be heated to 150-200° C. by passing steam; The second reactor is a pressure reactor or a normal pressure reactor, and the second reactor is configured to be heated to 85-200° C. by introducing steam or by using indirect heat exchange.
8. The method for preparing high modulus silicate from active silicon dioxide according to claim 1, characterized in that: The high modulus silicate liquid is a high modulus sodium silicate liquid or a high modulus potassium silicate liquid.
9. The method for preparing high modulus silicate from active silicon dioxide according to claim 1, characterized in that: The quartz sand powder, the strong alkali and the water are mixed uniformly according to a first preset mass ratio, including: Putting quartz sand powder, strong alkali and water into a first stirred reactor according to a first preset mass ratio and mixing them evenly; The active silicon dioxide powder and the wet silicate liquid are mixed uniformly according to a second preset mass ratio to obtain a mixed slurry, comprising: The active silicon dioxide powder and the wet silicate liquid are input into a second stirred reactor according to a second preset mass ratio and mixed evenly to obtain the mixed slurry.
10. The method for preparing high modulus silicate from active silicon dioxide according to claim 1, characterized in that: The high modulus silicate solution is used to produce inorganic silicide products, and the inorganic silicide products include any one of sodium silicate, potassium silicate, potassium sodium silicate, sodium metasilicate, white carbon black, silica gel, silica sol, and molecular sieve.