CN119490211A - A method for comprehensive utilization of red mud and bauxite - Google Patents

Abstract

The invention provides a method for comprehensive utilization of red mud and bauxite, which relates to the technical field of bauxite and comprises the following steps: mixing red mud and bauxite, adding water and a regulator, and fully stirring in a tank with a stirring function to disperse red mud and bauxite particles to obtain slurry; electrochemically treating the slurry to cause redox reaction of valuable elements in the slurry, and then performing thermochemical treatment to form compounds; the invention mixes red mud and bauxite, disperses particles, performs redox reaction by electrochemical treatment, and then performs thermochemical treatment to form compounds, separates by using cyclone separation technology, performs multi-stage high-gradient magnetic separation on undersize materials, and obtains multi-grade iron powder products. The whole process is convenient to implement, and a large amount of iron in red mud can be recovered without various expensive reagents, and iron powder products of different grades are screened out to meet the needs of different downstream customers and improve the utilization rate of red mud.

Description

Method for comprehensively utilizing red mud matched bauxite

Technical Field

The invention relates to the technical field of bauxite, in particular to a method for comprehensively utilizing red mud matched bauxite.

Background

Bauxite is a common name of industrially available ore which is composed of gibbsite, boehmite or diaspore as main minerals and is widely used for manufacturing refractory materials, grinding materials, chemicals, high alumina cement and the like, the bauxite is mainly used for producing alumina, red mud is a main solid waste in the production process, and a large amount of red mud is piled up to occupy a large amount of land resources and possibly cause environmental pollution;

The red mud is used as main waste in the production process of alumina, contains various elements such as iron, aluminum and silicon, but the complex components and the high water content thereof make the recycling difficult to be large, meanwhile, bauxite is used as main raw materials in the production and the utilization process of alumina, a large amount of waste is generated in the exploitation and the utilization process of bauxite, in the prior art, an effective treatment method for red mud and bauxite is not available, the red mud is generally simply piled up, the iron element in the red mud is extracted by adopting screening and other means, the obtained iron grade is not enough, other elements in waste are directly wasted and cannot be comprehensively utilized, and therefore, the invention provides a method for comprehensively utilizing the red mud matched with bauxite to solve the problems in the prior art.

Disclosure of Invention

Aiming at the problems, the invention provides the method for comprehensively utilizing the red mud matched bauxite, which is convenient to realize in the whole process, can realize the recovery of iron in the red mud greatly without various expensive reagents, screens out iron powder products with different grades, meets the requirements of different customers at the downstream, and improves the utilization rate of the red mud.

The invention aims at realizing the aim by adopting the following technical scheme that the method for comprehensively utilizing the red mud matched bauxite comprises the following steps:

S1, mixing red mud and bauxite, adding water and a regulator, and fully stirring in a tank with a stirring function to disperse red mud and bauxite particles to obtain slurry;

S2, carrying out electrochemical treatment on the slurry to enable valuable elements in the slurry to undergo oxidation-reduction reaction, and then carrying out thermochemical treatment to form a compound;

S3, separating the compound through a cyclone by utilizing a cyclone separation technology to obtain a cyclone underflow and a cyclone overflow;

s4, screening underflow of a cyclone to obtain oversize materials and undersize materials, and carrying out multistage high-gradient magnetic separation on the undersize materials to obtain a multi-grade iron powder product;

S5, carrying out high-gradient magnetic separation on overflow of the cyclone to obtain a low-grade fine iron powder product;

S6, crushing and grinding the oversize material, and extracting aluminum element in the oversize material by using a bauxite extraction technology to obtain an aluminum product;

and S7, evaporating, crystallizing and precipitating the liquid remained and generated in the process to obtain a silicate product, and synchronously collecting the evaporated clear liquid.

The further improvement is that in the S1, the components of the red mud are more than or equal to 35 percent of Fe2O3, less than or equal to 20 percent of Al2O3 and less than or equal to 5 percent of Na2O, and the red mud is pulp washed by a sedimentation process, wherein L/S is more than 1, and the alkali concentration is more than 5g/L.

In the S1, in the process of mixing the red mud and the bauxite to form uniform slurry, sulfuric acid is used as a regulator, a mixture of polyacrylamide and polyaluminum chloride is used as a dispersing agent, the dispersion and sedimentation of the red mud and the bauxite particles are promoted, the slurry is controlled to be neutral, and the viscosity is controlled to have fluidity which is between viscous and thin.

The further improvement is that the S2 comprises the following steps:

sending the slurry into an electrochemical treatment device, and applying an electric field by utilizing an electrolysis principle to enable valuable elements in the slurry to undergo oxidation-reduction reaction;

In the process, the current density is controlled to be 150-300A/m < 2 >, the voltage is controlled to be 9-29V, and the treatment time is controlled to be 20-40min;

After electrochemical treatment, the slurry is sent into a thermochemical treatment device, the temperature is controlled to be 800-1400 ℃, the pressure is controlled to be 5-15 atmospheres, and the time is controlled to be 60-100min, so that the compound is obtained.

The further improvement is that in the step S3, the ore feeding pressure is controlled to be 49-157kPa in the process of cyclone separation.

The further improvement is that in the step S4, the multistage high gradient magnetic separation of the screen discharging material comprises the following steps:

Preparing a high-gradient magnetic separator, and setting different magnetic field intensities according to magnetic separation requirements of iron powder with different tastes;

Carrying out high-gradient magnetic separation on the screen blanking to obtain a medium-grade iron powder product;

performing high-gradient magnetic separation on the medium-grade iron powder to obtain a high-grade iron powder product;

and carrying out high-gradient magnetic separation on the tailings subjected to magnetic separation to obtain a low-grade iron powder product.

The further improvement is that in the step S4, after high-gradient magnetic separation, a medium-grade iron powder product with the grade of 45-50% is obtained, a high-grade iron powder product with the grade of 50-55% is obtained, and a low-grade iron powder product with the grade of 40-45% is obtained.

The further improvement is that in the step S5, the high-gradient magnetic separation with the highest magnetic field intensity is carried out on the overflow of the cyclone, and the low-grade iron powder product with the grade of 40-45% is obtained.

The further improvement is that the step S6 comprises the following steps:

crushing and grinding the oversize material to obtain crushed materials;

Reacting the crushed material in water with a weak base to convert the aluminate into soluble meta-aluminate;

clarifying and filtering the generated solution to separate insoluble substances and obtain a pure sodium metaaluminate solution;

Adding carbon dioxide into the sodium metaaluminate solution to precipitate sodium metaaluminate;

the precipitate is dehydrated at high temperature to obtain alumina, which is then obtained by electrolysis.

The further improvement is that the step S7 comprises the following steps:

Pretreating the liquid product, including filtering and removing impurities;

evaporating and crystallizing by using an evaporator, feeding the pretreated liquid product into the evaporator, evaporating water by heating, controlling the heating temperature to be 80-120 ℃, controlling the evaporating pressure to be 0.1-1MPa, concentrating silicate, stirring and controlling crystallization;

After crystallization is completed, separating crystals from the mother liquor by centrifugation, filtration and sedimentation;

Drying the separated crystals, removing residual moisture and volatile substances to obtain silicate products, and synchronously collecting evaporated clear liquid.

The beneficial effects of the invention are as follows:

1. According to the invention, red mud and bauxite are mixed, particles are dispersed, oxidation-reduction reaction is carried out through electrochemical treatment, then thermochemical treatment is carried out, compounds are formed, separation is carried out through a cyclone separation technology, multi-stage high-gradient magnetic separation is carried out on screen discharging, a multi-grade iron powder product is obtained, the whole process is convenient to realize, various expensive reagents are not needed, iron in the red mud can be recovered greatly, different-grade iron powder products are screened out, the demands of different customers at the downstream are met, and the utilization rate of the red mud is improved.

2. According to the invention, high-gradient magnetic separation is carried out on overflow of the cyclone to obtain a low-grade fine iron powder product, the recovery efficiency of iron is higher, meanwhile, the oversize material of the cyclone is crushed and ground, aluminum element in the oversize material is extracted by using a bauxite extraction technology, and then evaporation crystallization and precipitation are carried out on the liquid which is remained and generated in all processes to obtain a silicate product, so that the method is beneficial to diversified recovery of various elements, diversified utilization and environmental friendliness.

Drawings

FIG. 1 is a flow chart of the present invention.

Detailed Description

The present invention will be further described in detail with reference to the following examples, which are only for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.

Example 1

According to the embodiment shown in fig. 1, the method for comprehensively utilizing the red mud matched bauxite is provided, and comprises the following steps:

S1, mixing red mud and bauxite, adding water and a regulator, and fully stirring in a tank with a stirring function to disperse red mud and bauxite particles to obtain slurry;

S2, carrying out electrochemical treatment on the slurry to enable valuable elements in the slurry to undergo oxidation-reduction reaction, and then carrying out thermochemical treatment to form a compound;

S3, separating the compound through a cyclone by utilizing a cyclone separation technology to obtain a cyclone underflow and a cyclone overflow;

s4, screening underflow of a cyclone to obtain oversize materials and undersize materials, and carrying out multistage high-gradient magnetic separation on the undersize materials to obtain a multi-grade iron powder product;

S5, carrying out high-gradient magnetic separation on overflow of the cyclone to obtain a low-grade fine iron powder product;

S6, crushing and grinding the oversize material, and extracting aluminum element in the oversize material by using a bauxite extraction technology to obtain an aluminum product;

and S7, evaporating, crystallizing and precipitating the liquid remained and generated in the process to obtain a silicate product, and synchronously collecting the evaporated clear liquid.

The red mud component and the content of Fe ₂O₃-50%、Al₂O₃-18%、Na₂ O-2.5 percent, and the red mud particles are dispersed to the greatest extent under the stirring effect by adding water in a tank. During separation, the underflow is magnetically separated by high-gradient magnetic separation equipment, and a medium-grade iron powder product with the grade of 45-50% is obtained. The method comprises the steps of carrying out high-gradient magnetic separation on medium-grade iron powder to obtain a high-grade iron powder product with the grade of 50-55%, carrying out high-gradient magnetic separation on tailings of a magnetic separator to obtain a low-grade iron powder product with the grade of 40-45%, carrying out high-gradient magnetic separation on overflow of a cyclone to obtain a low-grade iron powder product with the grade of 40-45% and finer granularity, realizing the large-scale recovery of ferric oxide in red mud, meeting the requirements of different customers on different low-grade iron powder products, improving the utilization rate of the red mud, enabling the products to be utilized in a diversified manner, and having the advantage of environmental friendliness.

Example two

According to the embodiment shown in fig. 1, the method for comprehensively utilizing the red mud matched bauxite is provided, and comprises the following steps:

Mixing red mud and bauxite, adding water and a regulator, fully stirring in a tank with a stirring function to disperse the red mud and bauxite particles, facilitating the separation and extraction of the red mud particles in the subsequent steps to obtain slurry, wherein Fe ₂O₃≥35%、Al₂O₃≤20%、Na₂ O is less than or equal to 5 percent in the components of the red mud, the red mud is pulp washed by a sedimentation procedure, L/S is greater than 1, the alkali concentration is greater than 5g/L, sulfuric acid is used as the regulator, and the mixture of polyacrylamide and polyaluminium chloride is used as the dispersant in the process of mixing the red mud and the bauxite to form uniform slurry, so that the dispersion and sedimentation of the red mud and the bauxite particles are promoted, the slurry is controlled to be neutral, and the viscosity is controlled to have fluidity in the middle between sticky and thin;

The method comprises the steps of carrying out electrochemical treatment on the slurry to enable valuable elements in the slurry to undergo oxidation-reduction reaction, and then carrying out thermochemical treatment to form a compound, specifically comprising the steps of sending the slurry into an electrochemical treatment device, applying an electric field to enable the valuable elements in the slurry to undergo oxidation-reduction reaction by utilizing an electrolysis principle, controlling the current density to be 150-300A/m < 2 >, controlling the voltage to be 9-29V, controlling the treatment time to be 20-40min, sending the slurry into a thermochemical treatment device after the electrochemical treatment, controlling the temperature to be 800-1400 ℃, controlling the pressure to be 5-15 atm, and controlling the time to be 60-100min, and obtaining the compound after the electrochemical and thermochemical combined treatment, wherein the valuable elements in the slurry are effectively extracted and separated. The method not only improves the utilization efficiency of resources, but also reduces environmental pollution and energy consumption, and simultaneously has high flexibility and adaptability because the process can optimize the extraction efficiency and the product quality by precisely controlling various parameters, and current density and voltage are two critical parameters in the electrochemical treatment process. The magnitude of the current density directly influences the reaction rate and extraction efficiency, while the voltage determines the direction and depth of the reaction. Under the conditions of high temperature and high pressure, valuable elements in slurry can further undergo chemical reaction to form a compound which is easy to separate, in the thermochemical treatment process, the temperature, the pressure and the reaction time are three key parameters, the temperature determines the reaction speed and the reaction depth, the pressure influences the reaction direction and the stability of a product, the reaction time determines the thoroughly degree of the reaction and the purity of the product, and the three parameters are accurately controlled to optimize the separation effect of the valuable elements and the product quality and ensure that the finally obtained product has high purity and added value;

The method comprises the steps of separating a compound through a cyclone by utilizing a cyclone separation technology to obtain a cyclone underflow and a cyclone overflow, controlling the ore feeding pressure to be 49-157kPa in the cyclone separation process, and controlling the cyclone underflow to be a substance discharged from a discharge port of solid particles in the liquid-solid separation process. When the suspension enters the cyclone, solid particles with higher density are thrown to the wall and move downwards along with the external cyclone flow due to the action of centrifugal force, and finally are discharged from the bottom flow port, wherein the cyclone underflow mainly comprises solid particles, the cyclone overflow mainly comprises substances discharged from the top or the side surface of the cyclone (through an overflow pipe), most of fluid in the cyclone can move upwards to form internal cyclone after reaching the vicinity of the bottom flow port and flow out of the overflow pipe, and the particles with lower density are not settled to the wall due to lower settling velocity of the particles with lower density, and can be discharged from the overflow along with the internal cyclone formed by most of liquid, and the cyclone overflow mainly comprises liquid;

In the separation process, controlling the diameter of a ore feeding port, wherein the diameter of the ore feeding port is 0.13-0.25 times of the diameter of a cyclone, increasing the diameter of the ore feeding port can improve the treatment capacity, but the classification efficiency can be reduced, the shape and the configuration of the ore feeding pipe are that the ore feeding pipe is a round or rectangular section, the configuration mode is that the long side is parallel to the axis of the cyclone, the short side is perpendicular to the axis of the cyclone, the involute type ore feeding pipe has the functions of reducing energy consumption, improving the production capacity and improving the separation efficiency, controlling the diameter of an overflow pipe, which is usually 0.2-0.3 times of the diameter of the cyclone, mainly has the effect of stably, constantly and continuously leading out separated overflow products, controlling the diameter of a sand settling port, ensuring that sand is discharged in an umbrella shape, the included angle is more ideal at 20-30 ℃, the diameter of the sand settling port is 0.07-0.1 times of the diameter of the overflow pipe, controlling the insertion depth of the overflow pipe, which has obvious influence on the separation effect, which is generally 0.5-0.8 times of the height of a cylindrical body, and the insertion depth can lead to increase short-circuit flow, shortening the separation time and increasing the content of the overflow products in the separation stage; when the cyclone separator is inserted too deeply, the coarse grain at the bottom can enter overflow, the classification efficiency is reduced, the ore feeding pressure is controlled, the ore feeding pressure has direct influence on the treatment capacity and the separation granularity of the cyclone separator, the cyclone separator is kept within the range of 49-157 kPa, and the classification granularity can be reduced and the treatment capacity can be improved by increasing the ore feeding pressure;

The method comprises the steps of preparing a high-gradient magnetic separator, setting different magnetic field intensities according to magnetic separation requirements of different grade iron powder, carrying out high-gradient magnetic separation on the screen underflow to obtain a medium-grade iron powder product, carrying out high-gradient magnetic separation on the medium-grade iron powder to obtain a high-grade iron powder product, carrying out high-gradient magnetic separation on tailings after magnetic separation to obtain a low-grade iron powder product, and obtaining a medium-grade iron powder product with a grade of 45-50% after the high-gradient magnetic separation to obtain a low-grade iron powder product with a grade of 40-45%;

Carrying out high-gradient magnetic separation on the overflow of the cyclone to obtain a low-grade fine iron powder product, specifically carrying out high-gradient magnetic separation on the highest magnetic field strength to obtain a low-grade fine iron powder product with the grade of 40-45 percent and the granularity;

Crushing and grinding the oversize material, and extracting aluminum element from the oversize material by using a bauxite extraction technology to obtain an aluminum product, wherein the method specifically comprises the following steps of:

crushing and grinding the oversize material to obtain crushed materials;

Reacting the crushed aggregates with a weak base in water to convert the aluminate into soluble metaaluminate, A1 ₂0₃+ 2NaOH+3H₂0→2NaAI(OH)₄;

clarifying and filtering the generated solution to separate insoluble substances and obtain a pure sodium metaaluminate solution;

Adding carbon dioxide into the sodium metaaluminate solution to precipitate sodium metaaluminate, wherein 2NaAI (0H) ₄+C0₂-Na₂C0₃+2A1(0H)₃↓+ H₂ is obtained;

Dehydrating the precipitate at high temperature to obtain alumina, 2AI (OH) ₃→A1₂0₃+ 3H₂ 0;

then, aluminum is obtained through electrolysis, and a Hall-Eleutzfeld electrolysis method is adopted, wherein the aluminum is 2A1 ₂0₃+3C→4A1 + 3C0₂;

Evaporating, crystallizing and precipitating the liquid remained and generated in the process to obtain silicate products, and synchronously collecting the evaporated clear liquid. The preparation method comprises the steps of preprocessing a liquid product, including filtering and removing impurities, evaporating and crystallizing by using an evaporator, conveying the preprocessed liquid product into the evaporator, evaporating water by heating, controlling the heating temperature to be 80-120 ℃, controlling the evaporating pressure to be 0.1-1MPa, concentrating silicate, stirring, controlling crystallization, separating the crystal from mother liquor by centrifugation, filtering and sedimentation after crystallization, drying the separated crystal, removing residual water and volatile substances, obtaining a silicate product, and synchronously collecting evaporated clear liquid. The evaporation rate depends on the heating temperature, the evaporation pressure and the properties of the liquid product, the treatment is controlled to be 9-15t per hour, the crystallization temperature is controlled to be near the saturation temperature of silicate, the crystallization time depends on the concentration of silicate, the crystallization temperature, the stirring strength and other factors, the crystallization time is controlled to be 5-12h, the stirring strength has important influence on the growth and the morphology of crystals, and the crystallization time is controlled to be 2500-3800r/min.

According to the method for comprehensively utilizing the red mud and the bauxite, the red mud and the bauxite are mixed, particles are dispersed, oxidation-reduction reaction is carried out through electrochemical treatment, thermochemical treatment is carried out, compounds are formed, separation is carried out through a cyclone separation technology, multistage high-gradient magnetic separation is carried out on the screen discharging material, a multi-grade iron powder product is obtained, the whole process is convenient to realize, various expensive reagents are not needed, the iron in the red mud can be recovered greatly, different-grade iron powder products are screened out, the requirements of different customers at the downstream are met, and the utilization rate of the red mud is improved. Meanwhile, the cyclone overflow is subjected to high-gradient magnetic separation to obtain a low-grade fine iron powder product, the recovery efficiency of iron is higher, meanwhile, the oversize material of the cyclone is crushed and ground, aluminum element in the oversize material is extracted by using a bauxite extraction technology, and then the residual and generated liquid in all the processes is subjected to evaporation crystallization and precipitation to obtain a silicate product, so that the method is favorable for recovering various elements in a diversified way, and is environment-friendly.

The foregoing has shown and described the basic principles, principal features and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present invention, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined in the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. The method for comprehensively utilizing the red mud matched bauxite is characterized by comprising the following steps of:

S1, mixing red mud and bauxite, adding water and a regulator, and fully stirring in a tank with a stirring function to disperse red mud and bauxite particles to obtain slurry;

S2, carrying out electrochemical treatment on the slurry to enable valuable elements in the slurry to undergo oxidation-reduction reaction, and then carrying out thermochemical treatment to form a compound;

S3, separating the compound through a cyclone by utilizing a cyclone separation technology to obtain a cyclone underflow and a cyclone overflow;

s4, screening underflow of a cyclone to obtain oversize materials and undersize materials, and carrying out multistage high-gradient magnetic separation on the undersize materials to obtain a multi-grade iron powder product;

S5, carrying out high-gradient magnetic separation on overflow of the cyclone to obtain a low-grade fine iron powder product;

S6, crushing and grinding the oversize material, and extracting aluminum element in the oversize material by using a bauxite extraction technology to obtain an aluminum product;

and S7, evaporating, crystallizing and precipitating the liquid remained and generated in the process to obtain a silicate product, and synchronously collecting the evaporated clear liquid.

2. The method for comprehensively utilizing the red mud matched bauxite according to claim 1, wherein in the S1, fe ₂O₃≥35%、Al₂O₃≤20%、Na₂ O is less than or equal to 5% in the red mud, the red mud is pulp washed by a sedimentation process, L/S is more than 1, and alkali concentration is more than 5g/L.

3. The method for comprehensively utilizing the red mud and the bauxite in the combination process according to claim 2, wherein in the S1, sulfuric acid is used as a regulator, a mixture of polyacrylamide and polyaluminum chloride is used as a dispersing agent in the process of mixing the red mud and the bauxite to form uniform slurry, the dispersion and sedimentation of the red mud and the bauxite particles are promoted, the slurry is controlled to be neutral, and the viscosity is controlled to have fluidity which is between viscous and thin.

4. The method for comprehensively utilizing the red mud matched bauxite according to claim 1, wherein the S2 comprises the following steps:

sending the slurry into an electrochemical treatment device, and applying an electric field by utilizing an electrolysis principle to enable valuable elements in the slurry to undergo oxidation-reduction reaction;

In the process, the current density is controlled to be 150-300A/m < 2 >, the voltage is controlled to be 9-29V, and the treatment time is controlled to be 20-40min;

After electrochemical treatment, the slurry is sent into a thermochemical treatment device, the temperature is controlled to be 800-1400 ℃, the pressure is controlled to be 5-15 atmospheres, and the time is controlled to be 60-100min, so that the compound is obtained.

5. The method for comprehensively utilizing the red mud matched bauxite according to claim 1, wherein in the step S3, the feeding pressure is controlled to be 49-157kPa in the process of cyclone separation.

6. The method for comprehensively utilizing the red mud matched bauxite according to claim 1, wherein in the step S4, the multistage high-gradient magnetic separation of the screen discharging is carried out, and the method comprises the following steps:

Preparing a high-gradient magnetic separator, and setting different magnetic field intensities according to magnetic separation requirements of iron powder with different tastes;

Carrying out high-gradient magnetic separation on the screen blanking to obtain a medium-grade iron powder product;

performing high-gradient magnetic separation on the medium-grade iron powder to obtain a high-grade iron powder product;

and carrying out high-gradient magnetic separation on the tailings subjected to magnetic separation to obtain a low-grade iron powder product.

7. The method for comprehensively utilizing the red mud matched bauxite according to claim 6, wherein in the step S4, after high-gradient magnetic separation, a middle-grade iron powder product with the grade of 45-50% is obtained, a high-grade iron powder product with the grade of 50-55% is obtained, and a low-grade iron powder product with the grade of 40-45% is obtained.

8. The method for comprehensively utilizing the red mud matched bauxite according to claim 1, wherein in the step S5, high-gradient magnetic separation with the highest magnetic field intensity is carried out on the overflow of the cyclone, and a low-grade iron powder product with the grade of 40-45% is obtained.

9. The method for comprehensively utilizing the red mud matched bauxite according to claim 1, wherein the step S6 comprises the following steps:

crushing and grinding the oversize material to obtain crushed materials;

Reacting the crushed material in water with a weak base to convert the aluminate into soluble meta-aluminate;

clarifying and filtering the generated solution to separate insoluble substances and obtain a pure sodium metaaluminate solution;

Adding carbon dioxide into the sodium metaaluminate solution to precipitate sodium metaaluminate;

the precipitate is dehydrated at high temperature to obtain alumina, which is then obtained by electrolysis.

10. The method for comprehensively utilizing the red mud matched bauxite according to claim 1, wherein the step S7 comprises the following steps:

Pretreating the liquid product, including filtering and removing impurities;

evaporating and crystallizing by using an evaporator, feeding the pretreated liquid product into the evaporator, evaporating water by heating, controlling the heating temperature to be 80-120 ℃, controlling the evaporating pressure to be 0.1-1MPa, concentrating silicate, stirring and controlling crystallization;

After crystallization is completed, separating crystals from the mother liquor by centrifugation, filtration and sedimentation;

Drying the separated crystals, removing residual moisture and volatile substances to obtain silicate products, and synchronously collecting evaporated clear liquid.