All-component recovery method for silicon-containing manganese carbonate ore

Abstract

The invention discloses a silicon-containing manganese carbonate ore all-component recovery method which comprises the following steps: S1, mixing silicon-containing manganese carbonate ore with water to obtain mixed slurry I, adding sulfuric acid into the mixed slurry I for acid leaching, cooling, aging and filtering to obtain acid leaching residues and a manganese sulfate solution; s2, mixing the acid leaching residues with water to obtain mixed slurry II, and carrying out mineral separation on the mixed slurry II to obtain gypsum and silicon-containing filter residues; s3, mixing the silicon-containing filter residues with ammonium fluoride and water to obtain mixed slurry III, performing high-temperature agitation leaching on the mixed slurry III, and cooling, aging and filtering after leaching is finished to obtain ammonium fluosilicate filtrate and filter residues; and S4, adding a surfactant into the ammonium fluosilicate filtrate, stirring, adding ammonia water, carrying out ammonia water leaching, aging, filtering, and drying to obtain the white carbon black. The recovery efficiency of the silicon-containing manganese carbonate ore is high, all-component recovery can be carried out on manganese sulfate and calcium sulfate and silicon dioxide in the residues, the economic value is high, and the process is simple.

Description

Technical Field

[0001] The invention relates to the technical field of manganese carbonate ore recovery, and in particular to a method for recovering all components of silicon-containing manganese carbonate ore. Background Art

[0002] The shape of manganese carbonate ore is generally granular, blocky or nodular; the color is usually gray-black or rose-colored, and it becomes dark brown after oxidation, and it is relatively hard; the main components of manganese carbonate ore are manganese carbonate, calcium carbonate, and silicon dioxide, and it has a very high comprehensive recycling value.

[0003] At present, manganese carbonate ore is mostly used in China to produce manganese sulfate, high-purity manganese carbonate, manganese tetraoxide, electrolytic manganese, cement raw materials, calcium carbonate and other products. The existing treatment method of manganese carbonate ore has too high requirements on the treatment cost and equipment of the ore, and the tailings cannot be well treated. Therefore, there is an urgent need for a treatment method with lower energy consumption, more environmental protection, more economy, simpler process route, and the ability to recover all components of the resources in the residue. Summary of the invention

[0004] In view of the above problems, the present invention aims to provide a method for recovering all components of silicon-containing manganese carbonate ore.

[0005] The technical solution of the present invention is as follows:

[0006] A method for recovering all components of silicon-containing manganese carbonate ore comprises the following steps:

[0007] S1: mixing silicon-containing manganese carbonate ore with water to obtain a mixed slurry 1, adding sulfuric acid to the mixed slurry 1 for acid leaching, cooling, aging, and filtering to obtain acid leaching residue and manganese sulfate solution;

[0008] S2: mixing the acid leaching residue with water to obtain a second mixed slurry, and performing mineral separation on the second mixed slurry to obtain gypsum and silicon-containing filter residue;

[0009] S3: mixing the silicon-containing filter residue with ammonium fluoride and water to obtain a mixed slurry three, and subjecting the mixed slurry three to high-temperature stirring leaching, collecting ammonia gas as a reaction byproduct during the leaching process, and converting the ammonia gas into ammonia water; cooling, aging, and filtering after the leaching to obtain an ammonium fluorosilicate filtrate and a filter residue;

[0010] S4: adding a surfactant to the ammonium fluorosilicate filtrate, stirring, and adding ammonia water to adjust the pH value of the solution to 7-8.5 during the stirring process to perform ammonia water leaching, aging, filtering, and drying after the reaction to obtain white carbon black.

[0011] Preferably, in step S1, the mass ratio of the silicon-containing manganese carbonate ore to water is 1:5-9, and the mass fraction of the sulfuric acid is 30-49%.

[0012] Preferably, in step S1, when acid leaching is performed, the temperature is set at 60-95°C, the stirring speed is set at 300-500 r / min, the acid leaching time is 1-5 h, and the mixture is cooled to room temperature and aged for 1-3 h.

[0013] Preferably, in step S2, the mass ratio of the acid leaching residue to water is 1:10-20.

[0014] Preferably, in step S3, the mass ratio of the silicon-containing filter residue to water is 1:15-25, and the ammonium fluoride is added according to the molar ratio of ammonium fluoride to silicon in the silicon-containing filter residue.

[0015] Preferably, in step S3, when high-temperature stirring leaching is performed, the temperature is set at 80-90°C, the stirring speed is set at 250-300 r / min, the leaching time is 4-5 h, cooled to room temperature, and the aging time is 1-3 h.

[0016] Preferably, in step S4, stirring is carried out at 35-40°C, the ammonia leaching time is 2-4h, the rotation speed is set at 200-350r / min, the aging time is 1-3h, and the drying temperature is 65-80°C.

[0017] Preferably, in step S4, when adding the ammonia water, the feed rate is set at 5 mL / min.

[0018] Preferably, step S1 further comprises the step of drying the manganese sulfate solution to obtain manganese sulfate, and the drying temperature is 90-105°C.

[0019] Preferably, step S2 further comprises the step of drying the gypsum and the silicon-containing filter residue, and the drying temperature is 100-130°C.

[0020] The beneficial effects of the present invention are:

[0021] The present invention first uses sulfuric acid to acid-leach silicon-containing manganese carbonate ore, which can efficiently leach manganese; the remaining acid-leaching residue is separated by ore dressing to obtain high-quality building gypsum and filter residue with a silicon content of 90%; the silicon-containing filter residue is then added with ammonium fluoride and ammonia water in steps, and after a two-step reversible reaction, the silicon in the filter residue is utilized, and a high-quality white carbon black product with low impurity content, high purity, meeting national standards, and having good specific surface area and adsorption performance is generated. The present invention has the advantages of high recovery efficiency of silicon-containing manganese carbonate ore, high economic value of products, simple process, etc., and is suitable for large-scale treatment of silicon-containing manganese carbonate ore. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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 labor.

[0023] Figure 1 The figure is a schematic flow diagram of the method for recovering all components of silicon-containing manganese carbonate ore according to the present invention. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, in the absence of conflict, the embodiments in this application and the technical features in the embodiments can be combined with each other. It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as those generally understood by those of ordinary skill in the art to which this application belongs. The words "including" or "comprising" and the like used in the disclosure of the present invention mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0025] like Figure 1 As shown, the present invention provides a method for recovering all components of silicon-containing manganese carbonate ore, comprising the following steps:

[0026] S1: mixing silicon-containing manganese carbonate ore with water to obtain a mixed slurry 1, adding sulfuric acid to the mixed slurry 1 for acid leaching, cooling, aging, and filtering to obtain acid leaching residue and manganese sulfate solution.

[0027] In a specific embodiment, the mass ratio of the silicon-containing manganese carbonate ore to water is 1:5-9, and the mass fraction of the sulfuric acid is 30-49%.

[0028] In a specific embodiment, during acid leaching, the temperature is set at 60-95° C., the stirring speed is set at 300-500 r / min, the acid leaching time is 1-5 h, cooled to room temperature, and the aging time is 1-3 h.

[0029] In a specific embodiment, the method further comprises drying the manganese sulfate solution to obtain manganese sulfate, and the drying temperature is 90-105°C.

[0030] In this step, the present invention adopts the atmospheric pressure acid leaching method to prepare manganese sulfate, the silicon-containing manganese carbonate ore and water are mixed into slurry in proportion, sulfuric acid is slowly added by a pump, and manganese carbonate and calcium carbonate are simultaneously converted into manganese sulfate and calcium sulfate during the acid leaching process.

[0031] MnCo3(S)+H2SO4(l)=MnSO4(S)+CO2(g)+H2O(l) (1)

[0032] CaCo3(S)+H2SO4(l)=CaSO4(S)+CO2(g)+H2O(l) (2)

[0033] In this step, it is necessary to set a suitable rotating speed, and the influence of stirring speed on the crystalline morphology is mainly reflected in the size and shape of the crystal. Stirring speed is too low to cause the interaction force between the solute molecules to be insufficient, and the diffusion speed of the solute molecules in the solution is slowed down, thereby forming larger crystals. High-speed stirring can promote the diffusion of solute molecules, so that the growth rate of the crystal increases, forming smaller crystals. However, too fast stirring speed can also cause the solvent to evaporate too fast, resulting in the inhomogeneity of the crystallization process, and even polycrystalline crystallization or agglomeration can be produced, so suitable stirring speed can promote the growth of calcium sulfate crystals.

[0034] S2: Mixing the acid leaching residue with water to obtain mixed slurry 2, and performing mineral separation on the mixed slurry 2 to obtain gypsum and silicon-containing filter residue.

[0035] In a specific embodiment, the mass ratio of the acid leaching residue to water is 1:10-20. Optionally, during mineral separation, the temperature is set at 20-35° C. It should be noted that during mineral separation, the acid leaching residue should be kept moist and weakly acidic.

[0036] In a specific embodiment, the method further includes drying the gypsum and the silicon-containing filter residue at a drying temperature of 100-130°C.

[0037] In this step, the building gypsum and silicon-containing filter residue can be separated by mineral separation by utilizing the different physical and chemical properties of the components in the acid leaching residue.

[0038] S3: mixing the silicon-containing filter residue with ammonium fluoride and water to obtain mixed slurry three, and subjecting the mixed slurry three to high-temperature stirring leaching, collecting the reaction by-product ammonia gas during the leaching process, and converting the ammonia gas into ammonia water; after the leaching is completed, cooling, aging, and filtering to obtain ammonium fluorosilicate filtrate and filter residue.

[0039] In a specific embodiment, the mass ratio of the silicon-containing filter residue to water is 1:15-25, and the ammonium fluoride is added according to the molar ratio of ammonium fluoride to silicon in the silicon-containing filter residue.

[0040] In a specific embodiment, when high-temperature stirring leaching is performed, the temperature is set at 80-90°C, the stirring speed is set at 250-300r / min, the leaching time is 4-5h, cooled to room temperature, and the aging time is 1-3h.

[0041] In this step, under normal pressure, the silicon-containing filter residue and ammonium fluoride can react at high temperature, and the by-product ammonia gas is blown out by an air pump and collected to make ammonia water. The air pump flow rate is not easy to be too high or too low. If the flow rate is too low, the ammonia gas cannot be removed in time, so that the reversible reaction proceeds slowly in the forward direction and the yield of the ammonium fluorosilicate solution is reduced; if the flow rate is too high, the evaporation of the system will be accelerated, which will also affect the yield of the ammonium fluorosilicate solution; therefore, the air flow rate of the air pump is too high or too low, which will affect the yield of ammonium fluorosilicate; after cooling and filtration, an ammonium fluorosilicate solution and a small amount of carbon can be obtained.

[0042]

[0043] S4: adding a surfactant to the ammonium fluorosilicate filtrate, stirring, and adding ammonia water to adjust the pH value of the solution to 7-8.5 during the stirring process to perform ammonia water leaching, aging, filtering, and drying after the reaction to obtain white carbon black.

[0044] In a specific embodiment, the surfactant is hexadecyltrimethylammonium bromide or sodium dodecylbenzenesulfonate, and 0.1-0.3 g of the surfactant is added to every 100 ml of ammonium fluorosilicate filtrate.

[0045] In a specific embodiment, the stirring is carried out at 35-40° C., the ammonia leaching time is 2-4 hours, the rotation speed is set at 200-350 r / min, the aging time is 1-3 hours, and the drying temperature is 65-80° C. When adding the ammonia water, the feed rate is set at 5 mL / min.

[0046] In a specific embodiment, the prepared white carbon black product has an average particle size of 1.04 μm, a median particle size of 0.95 μm, and a BET adsorption specific surface area of ​​310.99 m 2 / g, purity ≥98.5%.

[0047] In this step, a surfactant is added to the ammonium fluorosilicate filtrate, and the surfactant can form a microfilm on the surface of the silica powder particles to prevent the secondary agglomeration of the silica particles, so as to control the particle size of the silica product; the ammonia water collected in step S3 is returned to the ammonium fluorosilicate filtrate to obtain silica and ammonium fluoride, and the ammonium fluoride can be recycled.

[0048]

[0049] Example 1

[0050] A method for recovering all components of silicon-containing manganese carbonate ore comprises the following steps:

[0051] (1) 100 g of silicon-containing manganese carbonate ore and water were mixed into a slurry at a solid-liquid ratio of 1:9, and concentrated sulfuric acid with a mass fraction of 49% was added by a pump. The slurry was stirred and leached at 95° C. for 3 h, and the speed was adjusted to 300 r / min. After the reaction was completed, the slurry was cooled to room temperature and aged for 1 h. The acid leaching residue and manganese sulfate filtrate were obtained by filtration. The leaching rate of manganese in the silicon-containing manganese carbonate ore can reach 97.8%.

[0052] (2) The acid leaching residue is kept moist and weakly acidic by water, and the acid leaching residue is subjected to mineral separation to separate building gypsum and silicon-containing filter residue. The calcium sulfate content in the gypsum is 76.5%, and the gypsum yield of this operation can reach 35.8%; the silicon dioxide content in the silicon-containing filter residue is 92%.

[0053] (3) The silicon-containing filter residue and water were mixed into a slurry at a solid-liquid ratio of 1:24. The slurry was divided into three parts, and the same proportion of ammonium fluoride was added. The mixture was stirred and heated at 95°C for 4.5 hours, and the speed was adjusted to 300r / min. The by-product ammonia gas was blown out with three air pumps with different flow rates. The air pump flow rates were set at 0.3, 0.2, and 0.1L / min. After the reaction was completed, the slurry was cooled to room temperature, aged for 1 hour, and filtered to obtain an ammonium fluorosilicate solution and a small amount of filter residue. The ammonium fluorosilicate yields in this operation were 78.32%, 88.35%, and 74.23%.

[0054] (4) Add a certain proportion of surfactant to the ammonium fluorosilicate solution with the highest yield (add 0.2g of hexadecyltrimethylammonium bromide to 100ml of the solution), use a pump to slowly pump the collected ammonia water into the ammonium fluorosilicate solution, adjust the speed to 300r / min, react at 30°C for 1h, age for 1h after the reaction is completed, and filter to obtain white carbon black with a high specific surface area. The yield of white carbon black in this operation can reach 83.28%.

[0055] Example 2

[0056] A method for recovering all components of silicon-containing manganese carbonate ore comprises the following steps:

[0057] (1) 100 g of silicon-containing manganese carbonate ore and water were mixed into a slurry at a solid-liquid ratio of 1:8, and concentrated sulfuric acid with a mass fraction of 45% was added by a pump. The slurry was stirred and leached at 85° C. for 3 h, and the speed was adjusted to 300 r / min. After the reaction was completed, the slurry was cooled to room temperature and aged for 1 h. The acid leaching residue and manganese sulfate filtrate were filtered to obtain the leaching rate of manganese in the silicon-containing manganese carbonate ore. The leaching rate of manganese in the silicon-containing manganese carbonate ore can reach 89.1%.

[0058] (2) The acid leaching residue is kept moist and weakly acidic by water, and the acid leaching residue is subjected to mineral separation to separate building gypsum and silicon-containing filter residue. The calcium sulfate content in the gypsum is 71%, and the gypsum yield of this operation can reach 29.3%; the silicon dioxide content in the silicon-containing filter residue is 90.2%.

[0059] (3) The silicon-containing filter residue and water were mixed into a slurry at a solid-liquid ratio of 1:24, and ammonium fluoride was added. The mixture was stirred and heated at 90°C for 4.5 hours. The speed was adjusted to 300 r / min. The by-product ammonia gas was blown out using an air pump with the air pump flow rate set at 0.2 L / min. The ammonia gas was collected and made into ammonia water. After the reaction was completed, the slurry was cooled to room temperature, aged for 1 hour, and filtered to obtain an ammonium fluorosilicate solution and a small amount of filter residue. The ammonium fluorosilicate yield in this operation was 52.92%.

[0060] (4) Add a certain proportion of surfactant to the ammonium fluorosilicate solution (add 0.2g of hexadecyltrimethylammonium bromide to 100ml of the solution), use a pump to slowly pump the collected ammonia water into the ammonium fluorosilicate solution, adjust the speed to 300r / min, react at 30°C for 1h, age for 1h after the reaction is completed, and filter to obtain white carbon black with a high specific surface area. The yield of white carbon black in this operation can reach 49.80%.

[0061] Example 3

[0062] A method for recovering all components of silicon-containing manganese carbonate ore comprises the following steps:

[0063] (1) 100 g of silicon-containing manganese carbonate ore and water were mixed into a slurry at a solid-liquid ratio of 1:7, and concentrated sulfuric acid with a mass fraction of 40% was added by a pump. The slurry was stirred and leached at 70° C. for 3 h, and the speed was adjusted to 300 r / min. After the reaction was completed, the slurry was cooled to room temperature and aged for 1 h. The acid leaching residue and manganese sulfate filtrate were obtained by filtration. The leaching rate of manganese in the silicon-containing manganese carbonate ore can reach 79.5%.

[0064] (2) The acid leaching residue is kept moist and weakly acidic by water, and the acid leaching residue is subjected to mineral separation to separate building gypsum and silicon-containing filter residue. The calcium sulfate content in the gypsum is 61.3%, and the gypsum yield of this operation can reach 24.5%; the silicon dioxide content in the silicon-containing filter residue is 89.5%.

[0065] (3) The silicon-containing filter residue and water were mixed into a slurry at a solid-liquid ratio of 1:24, and ammonium fluoride was added. The mixture was stirred and heated at 85°C for 4.5 hours. The speed was adjusted to 300 r / min. The by-product ammonia gas was blown out using an air pump with the air pump flow rate set at 0.2 L / min. The ammonia gas was collected and made into ammonia water. After the reaction was completed, the slurry was cooled to room temperature, aged for 1 hour, and filtered to obtain an ammonium fluorosilicate solution and a small amount of filter residue. The ammonium fluorosilicate yield in this operation was 47.20%.

[0066] (4) Add a certain proportion of surfactant to the ammonium fluorosilicate solution (add 0.2g of hexadecyltrimethylammonium bromide to 100ml of the solution), use a pump to slowly pump the collected ammonia water into the ammonium fluorosilicate solution, adjust the speed to 300r / min, react at 30°C for 1h, age for 1h after the reaction is completed, and filter to obtain white carbon black with a high specific surface area. The yield of white carbon black in this operation can reach 44.42%.

[0067] Example 4

[0068] A method for recovering all components of silicon-containing manganese carbonate ore comprises the following steps:

[0069] (1) 100 g of silicon-containing manganese carbonate ore and water were mixed into a slurry at a solid-liquid ratio of 1:6, and concentrated sulfuric acid with a mass fraction of 35% was added by a pump. The slurry was stirred and leached at 60° C. for 3 h, and the speed was adjusted to 300 r / min. After the reaction was completed, the slurry was cooled to room temperature and aged for 1 h. The acid leaching residue and manganese sulfate filtrate were obtained by filtration. The leaching rate of manganese in the silicon-containing manganese carbonate ore can reach 77.6%.

[0070] (2) The acid leaching residue is kept moist and weakly acidic by water, and the acid leaching residue is subjected to mineral separation to separate building gypsum and silicon-containing filter residue. The calcium sulfate content in the gypsum is 52.5%, and the gypsum yield of this operation can reach 20.8%; the silicon dioxide content in the silicon-containing filter residue is 90.2%.

[0071] (3) The silicon-containing filter residue and water were mixed into a slurry at a solid-liquid ratio of 1:24, and ammonium fluoride was added. The mixture was stirred and heated at 80°C for 4.5 hours. The speed was adjusted to 300 r / min. The by-product ammonia gas was blown out using an air pump with the air pump flow rate set at 0.2 L / min. The ammonia gas was collected and made into ammonia water. After the reaction was completed, the slurry was cooled to room temperature, aged for 1 hour, and filtered to obtain an ammonium fluorosilicate solution and a small amount of filter residue. The ammonium fluorosilicate yield in this operation was 19.72%.

[0072] (4) Add a certain proportion of surfactant to the ammonium fluorosilicate solution (add 0.2g of hexadecyltrimethylammonium bromide to 100ml of the solution), use a pump to slowly pump the collected ammonia water into the ammonium fluorosilicate solution, adjust the speed to 300r / min, react at 35°C for 1h, age for 1h after the reaction is completed, and filter to obtain white carbon black with a high specific surface area. The yield of white carbon black in this operation can reach 18.56%.

[0073] In summary, the present invention provides a route for producing manganese sulfate with lower energy consumption, better environmental protection, higher economy and simpler process route, and recovers all components of calcium sulfate and silicon dioxide in the residue, so that resources are maximized. Compared with the prior art, the present invention has significant progress.

[0074] The above description is only a representative embodiment of the present invention and does not limit the present invention in any form. Any technician familiar with the profession, without departing from the scope of the technical solution of the present invention, uses the above-disclosed technical contents to make some changes or modifications to the embodiments are equivalent embodiments of the present invention. However, any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A method for recovering all components of silicon-containing manganese carbonate ore, characterized in that: The following steps are involved: S1: mixing silicon-containing manganese carbonate ore with water to obtain a mixed slurry 1, adding sulfuric acid to the mixed slurry 1 for acid leaching, cooling, aging, and filtering to obtain acid leaching residue and manganese sulfate solution; S2: mixing the acid leaching residue with water to obtain a second mixed slurry, and performing mineral separation on the second mixed slurry to obtain gypsum and silicon-containing filter residue; S3: mixing the silicon-containing filter residue with ammonium fluoride and water to obtain a mixed slurry three, and subjecting the mixed slurry three to high-temperature stirring leaching, collecting ammonia gas as a reaction byproduct during the leaching process, and converting the ammonia gas into ammonia water; cooling, aging, and filtering after the leaching to obtain an ammonium fluorosilicate filtrate and a filter residue; S4: adding a surfactant to the ammonium fluorosilicate filtrate, stirring, and adding ammonia water to adjust the pH value of the solution to 7-8.5 during the stirring process to perform ammonia water leaching, aging, filtering, and drying after the reaction to obtain white carbon black.

2. The method for recovering all components of silicon-containing manganese carbonate ore according to claim 1, characterized in that: In step S1, the mass ratio of the silicon-containing manganese carbonate ore to water is 1:5-9, and the mass fraction of the sulfuric acid is 30-49%.

3. The method for recovering all components of silicon-containing manganese carbonate ore according to claim 1, characterized in that: In step S1, when acid leaching is performed, the temperature is set at 60-95° C., the stirring speed is set at 300-500 r / min, the acid leaching time is 1-5 h, cooled to room temperature, and the aging time is 1-3 h.

4. The method for recovering all components of silicon-containing manganese carbonate ore according to claim 1, characterized in that: In step S2, the mass ratio of the acid leaching residue to water is 1:10-20.

5. The method for recovering all components of silicon-containing manganese carbonate ore according to claim 1, characterized in that: In step S3, the mass ratio of the silicon-containing filter residue to water is 1:15-25, and the ammonium fluoride is added according to the molar ratio of ammonium fluoride to silicon in the silicon-containing filter residue.

6. The method for recovering all components of silicon-containing manganese carbonate ore according to claim 1, characterized in that: In step S3, when high-temperature stirring leaching is performed, the temperature is set at 80-90°C, the stirring speed is set at 250-300r / min, the leaching time is 4-5h, cooled to room temperature, and the aging time is 1-3h.

7. The method for recovering all components of silicon-containing manganese carbonate ore according to claim 1, characterized in that: In step S4, stirring is carried out at 35-40°C, the ammonia leaching time is 2-4h, the rotation speed is set at 200-350r / min, the aging time is 1-3h, and the drying temperature is 65-80°C.

8. The method for recovering all components of silicon-containing manganese carbonate ore according to claim 1, characterized in that: In step S4, when adding the ammonia water, the feed rate is set at 5 mL / min.

9. The method for recovering all components of silicon-containing manganese carbonate ore according to claim 1, characterized in that: Step S1 also includes a step of drying the manganese sulfate solution to obtain manganese sulfate, and the drying temperature is 90-105°C.

10. The method for recovering all components of silicon-containing manganese carbonate ore according to claim 1, characterized in that: Step S2 also includes a step of drying the gypsum and the silicon-containing filter residue, and the drying temperature is 100-130°C.

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