Preparation method of low sodium aluminum magnesium

Abstract

The present invention discloses a method for preparing low-sodium aluminum magnesium salt, comprising the following steps: 1) dissolving an aluminum salt or its hydrate in water, adding magnesium hydroxide, heating the reaction for a period of time, adding an ammonium bicarbonate solution, heating the reaction again, and separating to obtain a solid for later use; 2) mixing the solid obtained in step 1) in water, adding magnesium hydroxide and ammonium bicarbonate, heating the reaction, washing and drying the solid separated after the reaction, thereby obtaining the aluminum magnesium salt. The method for preparing the low-sodium aluminum magnesium salt of the present invention utilizes a double decomposition reaction of an aluminum salt or its hydrate, magnesium hydroxide, and ammonium bicarbonate in water under heating conditions to prepare the aluminum magnesium salt. This method avoids the use of sodium salt and the complex operation of washing with a large amount of water to remove sodium, thereby conserving water resources. The prepared aluminum magnesium salt product meets EP quality standards, has a sodium content of less than 30 ppm, and a yield of 96-100%, making it suitable for industrial production.

Description

Technical Field

[0001] The invention belongs to the technical field of raw material medicine preparation, and particularly relates to a preparation method of low-sodium aluminum magnesium additive. Background Art

[0002] The chemical name of Almagate is aluminum magnesium tetradecanoate hydrate, and its molecular formula is Al2Mg6(OH) 14 (CO₃)₂·4H₂O has a layered crystalline structure with stable properties that remain stable even after long-term storage. Aluminum-magnesium-plus has a large specific surface area and can maintain a pH of 3.0–5.0 in the stomach for a long time without acid rebound, demonstrating excellent antacid properties. Aluminum-magnesium-plus works by neutralizing gastric acid, inhibiting pepsin hydrolysis by reducing acid ions and absorbing pepsin, preventing further damage to the gastric mucosa when it fails. Furthermore, it selectively absorbs bile acid (binding bile acid in acidic environments and releasing it in alkaline environments) and lysolecithin, demonstrating its efficacy against gastric ulcers caused by bile acid reflux. As an ideal antacid, aluminum-magnesium-plus holds broad promise for the treatment and prevention of peptic ulcer disease.

[0003] For patients with renal insufficiency, it is best to use products that do not contain sodium (or have low content) and calcium. The quality standards of aluminum magnesium plus raw materials in the European Pharmacopoeia, version 8.0, clearly stipulate that the sodium content must not exceed 150ppm.

[0004] Patent CN104163443A discloses a method for preparing aluminum-magnesium antacids: the antacid is prepared by a double decomposition reaction of a soluble aluminum salt or its hydrate (aluminum chloride, aluminum nitrate), a magnesium salt or its hydrate (magnesium chloride, magnesium nitrate), and a carbonate (potassium carbonate, sodium carbonate) in water under heating conditions. The chemical reaction formula is:

[0005] 2Al 3+ +6Mg 2+ +9CO3 2- +11H2O→Al2Mg6(OH) 14 (CO3)2·4H2O, the carbonate selected in the raw material of this method is sodium salt or potassium salt, which easily leads to a high content of sodium salt or potassium salt in the aluminum-magnesium addition product, which needs to be washed and removed, consumes a lot of water, and may still not meet the requirements after washing.

[0006] Patent CN108159072A discloses a preparation process for aluminum-magnesium addition: bicarbonate, alkaline aluminum, and alkaline magnesium are dissolved in pure water to form a mixed solution, stirred for reaction, cooled, filtered, washed, and dried to obtain the product. The alkaline aluminum and alkaline magnesium are aluminum hydroxide and magnesium hydroxide or aluminum oxide and magnesium oxide, and are prepared by reacting water-soluble aluminum salts, water-soluble magnesium salts, and a strong alkaline substance (such as sodium hydroxide, etc.). In this method, the selected alkaline aluminum and alkaline magnesium are prepared by reacting water-soluble aluminum salts, water-soluble magnesium salts, and a strong alkaline substance (such as sodium hydroxide, etc.). However, the method still has the problem of high sodium or potassium content, resulting in a high sodium or potassium salt content in the aluminum-magnesium addition product, which requires washing to remove, consumes a lot of water, and is cumbersome to operate.

[0007] Therefore, it is necessary to provide a preparation method of low-sodium aluminum magnesium additive suitable for industrial production. Summary of the Invention

[0008] The purpose of the present invention is to provide a method for preparing low-sodium aluminum magnesium, so as to solve the technical problems that the aluminum magnesium raw material prepared by the existing method has a high sodium content and the sodium removal by washing is inconvenient and costly.

[0009] According to one aspect of the present invention, there is provided a method for preparing low-sodium aluminum magnesium salt, comprising the following steps:

[0010] 1) Dissolve the aluminum salt or its hydrate in water, add magnesium hydroxide, heat and react for a period of time, add ammonium bicarbonate solution, heat and react again, and separate the solid for use;

[0011] 2) The solid obtained in step 1) is mixed in water, magnesium hydroxide and ammonium bicarbonate are added, and the temperature is raised to react. The solid separated after the reaction is washed and dried to obtain aluminum magnesium hydroxide.

[0012] Furthermore, in step 1), the aluminum salt is selected from at least one of aluminum chloride, aluminum nitrate, and aluminum sulfate.

[0013] Furthermore, in step 1), the molar ratio of aluminum ion in the aluminum salt or its hydrate:magnesium hydroxide:ammonium bicarbonate is 1:2-4:4-5.

[0014] Furthermore, in step 1), the mass concentration of the ammonium bicarbonate solution is 10-25%.

[0015] Furthermore, in step 1), the ammonium bicarbonate solution is added dropwise.

[0016] Furthermore, in step 1), the first temperature-raising reaction is to raise the temperature to 60-80° C. and stir the reaction for 1-4 hours, and the second temperature-raising reaction is to raise the temperature to 65-100° C. and stir the reaction for 1-5 hours.

[0017] Furthermore, in step 2), the molar ratio of the added magnesium hydroxide and ammonium bicarbonate to the aluminum ions in the aluminum salt or its hydrate added in step 1) is 0.1-0.5:0.1-0.5:1, preferably 0.1-0.3:0.1-0.3:1.

[0018] Furthermore, in step 2), the heating for reaction is heating to 65-100° C. and stirring the reaction for 1-5 hours.

[0019] Furthermore, in step 2), the washing is performed by pulping, and the specific operation is to disperse the solid obtained after the reaction in water, stir at 35-40° C., and filter to obtain the aluminum-magnesium humidified product.

[0020] Furthermore, the drying is to dry the aluminum-magnesium humidified product at 70-90° C. for 12-15 hours, collect the semi-dried product, crush it, and then dry it at 70-90° C. for 2-4 hours to obtain the aluminum-magnesium refined product.

[0021] Beneficial effects of the present invention:

[0022] The preparation method of the low-sodium aluminum-magnesium additive of the present invention utilizes aluminum salt or its hydrate, magnesium hydroxide, and ammonium bicarbonate to carry out a double decomposition reaction in water under heating conditions to prepare the product, thereby avoiding the use of sodium salt and the complicated operation of washing with a large amount of water to remove sodium, thus saving water resources. The prepared aluminum-magnesium additive product meets the EP quality standard, has a sodium content of less than 30 ppm, and a yield of 96-100%, and is suitable for industrial production. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is the infrared spectrum of aluminum and magnesium plus reference substance;

[0024] Figure 2 This is the infrared spectrum of the aluminum-magnesium product prepared in Example 1;

[0025] Figure 3 This is the infrared spectrum of the aluminum-magnesium product prepared in Example 2;

[0026] Figure 4 This is the infrared spectrum of the aluminum-magnesium product prepared in Example 3. DETAILED DESCRIPTION

[0027] The present invention provides a method for preparing low-sodium aluminum magnesium salt, comprising the following steps:

[0028] 1) Dissolve the aluminum salt or its hydrate in water, add magnesium hydroxide, heat and react for a period of time, add ammonium bicarbonate solution, heat and react again, separate and obtain a solid for use; the amount of water used is about 5 to 10 times the mass of the aluminum salt or its hydrate, preferably drinking water,

[0029] 2) The solid obtained in step 1) is mixed uniformly in water, with the amount of water being approximately 3 to 10 times the mass of the solid. The solid is stirred and dispersed uniformly in the water. Magnesium hydroxide and ammonium bicarbonate are added, and the temperature is raised to react. The solid separated after the reaction is washed and dried to obtain aluminum magnesium hydroxide.

[0030] The preparation method of the low sodium aluminum magnesium additive of the present invention has the chemical reaction formula:

[0031] Al 3+ +Mg(OH)2+NH 4+ +HCO3 - +H2O→Al2Mg6(OH) 14 (CO3) 2 ·4H2O↓+CO2↑+NH3↑.

[0032] The following table is the quality standard for aluminum and magnesium inspection items (EP).

[0033] Table 1 Quality standards for aluminum-magnesium (EP) inspection items

[0034]

[0035] The preparation method of the low-sodium aluminum-magnesium additive of the present invention utilizes aluminum salt or its hydrate, magnesium hydroxide, and ammonium bicarbonate to carry out a double decomposition reaction in water under heating conditions to prepare the product, thereby avoiding the use of sodium salt and the complicated operation of washing with a large amount of water to remove sodium, thus saving water resources. The prepared aluminum-magnesium additive product meets the EP quality standard, has a sodium content of less than 30 ppm, and a yield of 96-100%, and is suitable for industrial production.

[0036] In step 1) of the present invention, the aluminum salt is a water-soluble aluminum salt that dissolves in water and participates in the reaction in an ionic state. The aluminum salt is preferably at least one of aluminum chloride, aluminum nitrate, and aluminum sulfate.

[0037] In step 1) of the present invention, the molar ratio of aluminum ions in the aluminum salt or its hydrate: magnesium hydroxide: ammonium bicarbonate is 1:2-4:4-5.

[0038] In step 1) of the present invention, the mass concentration of the ammonium bicarbonate solution is 10-25%, and the ammonium bicarbonate solution is added dropwise.

[0039] In step 1) of the present invention, the first temperature-raising reaction is to raise the temperature to 60-80° C. and react for 1-4 hours, and the second temperature-raising reaction is to raise the temperature to 65-100° C. and react for 1-5 hours.

[0040] In step 2) of the present invention, the molar ratio of the added magnesium hydroxide and ammonium bicarbonate to the aluminum ions in the aluminum salt or its hydrate added in step 1) is 0.1-0.5:0.1-0.5:1, preferably 0.1-0.3:0.1-0.3:1.

[0041] In step 2) of the present invention, the temperature is raised to 65-100° C. and the reaction is stirred for 1-5 hours.

[0042] In step 1 and step 2) of the present invention, after the reaction is completed, the reaction mixture is centrifuged to obtain a solid.

[0043] In step 2) of the present invention, washing is performed by beating washing, and the specific operation is to disperse the solid obtained after the reaction in water, the amount of water used is about 5 to 10 times the mass of the solid, stir at 35 to 40° C. for 0.5 to 1 hour, and filter to obtain the aluminum-magnesium humidified product.

[0044] In step 2) of the present invention, drying is performed by drying the aluminum-magnesium humidified product at 70-90° C. for 12-15 hours, collecting the semi-dried product, which is in a compacted state, first crushing it, and then drying it again at 70-90° C. for 2-4 hours to dry the wet part to obtain the aluminum-magnesium refined product.

[0045] The present invention is further described in detail below through specific examples. The following examples are only used to further illustrate the present invention and should not be construed as limiting the present invention.

[0046] The reagents and raw materials used in the present invention are all commercially available.

[0047] Example 1.

[0048] Add 272 kg of drinking water to a 1000 L reactor, stir, add 35.0 kg of aluminum sulfate 18hydrate, heat to 65-70°C, dissolve clearly, add 19.14 kg of magnesium hydroxide, and stir for 1 hour.

[0049] Dissolve 39.1 kg of ammonium bicarbonate in 206 kg of drinking water and add dropwise to the reactor. Maintain the temperature at 60-70°C for about 1.5 hours. After the addition is complete, raise the temperature to 70-90°C and keep the reaction for 3 hours. Stop the reaction, cool to below 40°C, and centrifuge to obtain a crude aluminum-magnesium product.

[0050] Add 210 kg of drinking water to a 1000 L reactor, add 1.0 kg of magnesium hydroxide and 1.25 kg of ammonium bicarbonate solid at room temperature, stir and disperse for 1 hour, then heat to 70-90°C and keep warm for 2 hours. Stop the reaction, cool to below 40°C, and centrifuge to obtain an aluminum-magnesium reinforced solid.

[0051] Add 210 kg of drinking water into a 500 L reactor, stir at 35-40 ° C for 0.5-1 hour, centrifuge to obtain a filter cake, which is the aluminum-magnesium humidification product.

[0052] The whole batch of wet products was heated to 70-90℃ and dried for 12-15 hours. The semi-dried products were collected, crushed, and then placed in an oven at 70-90℃ and dried for 2-4 hours to obtain 32.11 kg of aluminum-magnesium refined products. The aluminum-magnesium refined products had a molar yield of 98.2%. The aluminum-magnesium refined products were subjected to infrared scanning to obtain the infrared spectrum as shown below: Figure 2 shown. Figure 1 It is the infrared spectrum of aluminum and magnesium plus reference substance. After identification, the infrared spectrum of the product prepared in this embodiment is consistent with the spectrum of aluminum and magnesium plus reference substance.

[0053] Sample test results: Acidity: pH maintained between 3.71 and 3.94, consuming 16.59 ml of 0.1 mol / L sodium hydroxide solution; pH: 9.69; Chloride: < 0.1%; Sulfate: < 0.4%; Sodium: 25 ppm; Loss on ignition: 45.84%; Heavy metals: Acceptable; Aluminum oxide: 15.5%; Magnesium oxide: 37.42%; Carbonate: 13.07%. The aluminum-magnesium-added API prepared in this example meets EP quality standards.

[0054] Example 2.

[0055] Add 250 kg of drinking water to a 1000 L reactor, stir, add 27.9 kg of aluminum chloride hexahydrate, heat to 65-70 ° C, dissolve clearly, add 21.79 kg of magnesium hydroxide, and stir for 1 hour.

[0056] Dissolve 42.72 kg of ammonium bicarbonate in 140.0 kg of drinking water and add dropwise to the reactor. Maintain the temperature at 70-80°C for about 1.5 hours. After the addition is complete, raise the temperature to 85-90°C and keep the temperature to react for 3 hours. Stop the reaction, cool to below 40°C, and centrifuge to obtain a crude aluminum-magnesium product.

[0057] Add 210 kg of drinking water to a 1000 L reactor, add 1.0 kg of magnesium hydroxide and 1.25 kg of ammonium bicarbonate solid at room temperature, stir and disperse for 1 hour, then heat to 85-90°C and keep warm for 2 hours. Stop the reaction, cool to below 40°C, and centrifuge to obtain an aluminum-magnesium-added solid.

[0058] Add 210 kg of drinking water into a 500 L reactor, stir at 35-40 ° C for 0.5-1 hour, centrifuge to obtain a filter cake, which is the aluminum-magnesium humidification product.

[0059] The whole batch of wet products was heated to 70-75℃ and dried for 12-15 hours. The semi-dried products were collected, crushed, and then placed in an oven at 70-75℃ and dried for 2-4 hours to obtain 31.8 kg of aluminum-magnesium refined products. The aluminum-magnesium refined products had a molar yield of 97.5%. The aluminum-magnesium refined products were subjected to infrared scanning to obtain the infrared spectrum as shown below: Figure 3After identification, the infrared spectrum of the product prepared in this example is consistent with the spectrum of the aluminum-magnesium reference substance.

[0060] Sample test results: Acidity: pH maintained at 3.47-3.87, consuming 19.4 ml of 0.1 mol / L sodium hydroxide solution; pH: 9.68; Chloride: < 0.1%; Sulfate: < 0.4%; Sodium: 14 ppm; Loss on ignition: 44.5%; Heavy metals: Acceptable; Aluminum oxide: 15.4%; Magnesium oxide: 36.8%; Carbonate: 13.62%. The aluminum-magnesium-added API prepared in this example meets EP quality standards.

[0061] Example 3.

[0062] Add 280 kg of drinking water to a 1000 L reactor, stir, add 39.01 kg of aluminum nitrate nonahydrate, heat to 65-70°C, dissolve clearly, add 19.14 kg of magnesium hydroxide, and stir for 1 hour.

[0063] Dissolve 40.0 kg of ammonium bicarbonate in 206 kg of drinking water and add dropwise to the reactor. Maintain the temperature at 65-70°C for about 1.5 hours. After the addition is complete, raise the temperature to 85-90°C and keep the reaction for 3 hours. Stop the reaction, cool to below 40°C, and centrifuge to obtain a crude aluminum-magnesium product.

[0064] Add 210 kg of drinking water to a 1000 L reactor, add 1.0 kg of magnesium hydroxide and 1.25 kg of ammonium bicarbonate solid at room temperature, stir and disperse for 1 hour, then heat to 85-90°C and keep warm for 2 hours. Stop the reaction, cool to below 40°C, and centrifuge to obtain an aluminum-magnesium-added solid.

[0065] Add 210 kg of drinking water into a 500 L reactor, stir at 35-40 ° C for 0.5-1 hour, centrifuge to obtain a filter cake, which is the aluminum-magnesium humidification product.

[0066] The whole batch of wet products was heated to 70-75°C and dried for 12-15 hours. The semi-dried products were collected, crushed, and then placed in an oven at 70-75°C and dried for 2-4 hours to obtain 31.5 kg of aluminum-magnesium refined products. The aluminum-magnesium refined products had a molar yield of 96.5%. The aluminum-magnesium refined products were subjected to infrared scanning to obtain the infrared spectrum as shown below: Figure 4 After identification, the infrared spectrum of the product prepared in this example is consistent with the spectrum of the aluminum-magnesium reference substance.

[0067] Sample test results: Acidity: pH maintained at 3.43-3.88, consuming 18.5 ml of 0.1 mol / L sodium hydroxide solution; pH: 9.68; Chloride: < 0.1%; Sulfate: < 0.4%; Sodium: 21 ppm; Loss on ignition: 46.0%; Heavy metals: Acceptable; Aluminum oxide: 15.35%; Magnesium oxide: 37.1%; Carbonate: 13.52%. The aluminum-magnesium-added API prepared in this example meets EP quality standards.

[0068] Example 4.

[0069] Add 280 kg of drinking water to a 1000 L reactor, stir, add 39.01 kg of aluminum nitrate nonahydrate, heat to 65-70°C, dissolve clearly, add 12.2 kg of magnesium hydroxide, and stir for 1 hour.

[0070] Dissolve 32.9 kg of ammonium bicarbonate in 206 kg of drinking water and add dropwise to the reactor. Maintain the temperature at 60-70°C for about 1.5 hours. After the addition is complete, raise the temperature to 75-80°C and keep the temperature for 3 hours. Stop the reaction, cool to below 40°C, and centrifuge to obtain a crude aluminum-magnesium product.

[0071] Add 210 kg of drinking water to a 1000 L reactor, add 3.0 kg of magnesium hydroxide and 4.1 kg of ammonium bicarbonate solid at room temperature, stir and disperse for 1 hour, then heat to 85-90°C and keep warm for 2 hours. Stop the reaction, cool to below 40°C, and centrifuge to obtain an aluminum-magnesium-added solid.

[0072] Add 200kg of drinking water into a 500L reactor, stir at 35-40℃ for 0.5-1 hour, centrifuge and obtain a filter cake, which is the aluminum-magnesium humidification product.

[0073] The entire batch of wet product was heated to 70-75°C and dried for 12-15 hours. The semi-dried product was collected, crushed, and then dried in an oven at 70-75°C for 2-4 hours to obtain 32.1 kg of a refined aluminum-magnesium product with a molar yield of 98.3%. The refined aluminum-magnesium product was subjected to infrared scanning, and the obtained infrared spectrum was consistent with that of the aluminum-magnesium reference product.

[0074] Sample test results: Acidity: pH maintained at 3.51-3.89, consuming 18.1 ml of 0.1 mol / L sodium hydroxide solution; pH: 9.67; Chloride: < 0.1%; Sulfate: < 0.4%; Sodium: 19 ppm; Loss on ignition: 45.3%; Heavy metals: Acceptable; Aluminum oxide: 15.30%; Magnesium oxide: 37.1%; Carbonate: 13.6%. The aluminum-magnesium-added API prepared in this example meets EP quality standards.

[0075] Example 5.

[0076] Add 250 kg of drinking water to a 1000 L reactor, stir, add 27.9 kg of aluminum chloride hexahydrate, heat to 65-70 ° C, dissolve clearly, add 26.8 kg of magnesium hydroxide, and stir for 1 hour.

[0077] Dissolve 45.5 kg of ammonium bicarbonate in 140.0 kg of drinking water and add dropwise to the reactor. Maintain the temperature at 70-80°C for about 1.5 hours. After the addition is complete, raise the temperature to 85-90°C and keep the temperature for 3 hours. Stop the reaction, cool to below 40°C, and centrifuge to obtain a crude aluminum-magnesium product.

[0078] Add 210 kg of drinking water to a 1000 L reactor, add 0.7 kg of magnesium hydroxide and 0.9 kg of ammonium bicarbonate solid at room temperature, stir and disperse for 1 hour, then heat to 85-90°C and keep warm for 2 hours. Stop the reaction, cool to below 40°C, and centrifuge to obtain an aluminum-magnesium reinforced solid.

[0079] Add 210 kg of drinking water into a 500 L reactor, stir at 35-40 ° C for 0.5-1 hour, centrifuge to obtain a filter cake, which is the aluminum-magnesium humidification product.

[0080] The entire batch of wet product was heated to 70-75°C and dried for 12-15 hours. The semi-dried product was collected, crushed, and then dried in an oven at 70-75°C for 2-4 hours to obtain 31.4 kg of a refined aluminum-magnesium product with a molar yield of 96.2%. The refined aluminum-magnesium product was subjected to infrared scanning, and the obtained infrared spectrum was consistent with that of the aluminum-magnesium reference product.

[0081] Sample test results: Acidity: pH maintained between 3.45 and 3.85, consuming 19.1 ml of 0.1 mol / L sodium hydroxide solution; pH: 9.65; Chloride: < 0.1%; Sulfate: < 0.4%; Sodium: 17 ppm; Loss on ignition: 44.8%; Heavy metals: Acceptable; Aluminum oxide: 15.7%; Magnesium oxide: 36.5%; Carbonate: 13.2%. The aluminum-magnesium-added API prepared in this example meets EP quality standards.

[0082] The above content is a further detailed description of the present application in conjunction with specific implementation methods, and it cannot be considered that the specific implementation of the present application is limited to these descriptions. For ordinary technicians in the technical field to which the present application belongs, they can make several simple deductions or substitutions without departing from the concept of the present application, which should be considered to fall within the scope of protection of the present application.

Claims

1. A method for preparing low sodium aluminum magnesium additive, characterized in that: The following steps are involved: 1) Dissolve the aluminum salt or its hydrate in water, add magnesium hydroxide, heat to 60-80°C, stir and react for 1-4 hours, add ammonium bicarbonate solution, heat again to 65-100°C, stir and react for 1-5 hours, separate and obtain the solid for use. The molar ratio of aluminum ion:magnesium hydroxide:ammonium bicarbonate in the aluminum salt or its hydrate is 1:2-4:4-5, The aluminum salt is selected from at least one of aluminum chloride, aluminum nitrate, and aluminum sulfate; 2) The solid obtained in step 1) is mixed in water, magnesium hydroxide and ammonium bicarbonate are added, the temperature is raised to 65-100° C., and the mixture is stirred for reaction for 1-5 hours. The solid separated after the reaction is washed and dried to obtain aluminum magnesium salt; wherein the molar ratio of the added magnesium hydroxide and ammonium bicarbonate to the aluminum ion in the aluminum salt or its hydrate added in step 1) is 0.1-0.5:0.1-0.5:

1.

2. The method for preparing low sodium aluminum magnesium according to claim 1, wherein: In step 1), the mass concentration of the ammonium bicarbonate solution is 10-25%, The ammonium bicarbonate solution is added dropwise.

3. The method for preparing low sodium aluminum magnesium according to claim 1, characterized in that: In step 2), the molar ratio of magnesium hydroxide and ammonium bicarbonate to the aluminum ions in the aluminum salt or its hydrate added in step 1) is 0.1-0.3:0.1-0.3:

1.

4. The method for preparing low sodium aluminum magnesium according to claim 1, characterized in that: In step 2), the washing is performed by beating washing, and the specific operation is to disperse the solid obtained after the reaction in water, stir at 35-40° C., and filter to obtain the aluminum-magnesium humidified product.

5. The method for preparing low sodium aluminum magnesium according to claim 4, characterized in that: The drying step comprises drying the aluminum-magnesium humidified product at 70-90° C. for 12-15 hours, collecting the semi-dried product, crushing it, and then drying it at 70-90° C. for 2-4 hours to obtain the aluminum-magnesium refined product.

Images