Preparation method for nano magnesia solid alkali based on doped lignosite
A nano-magnesium oxide, calcium lignosulfonate technology, applied in magnesium oxide, chemical instruments and methods, chemical/physical processes, etc., can solve the problems of high cost and high price, achieve low cost, high solid alkali strength, The effect of process and process simplicity
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Embodiment 1
[0021] 100mL 0.5mol·L -1 MgCl 2 The solution was added to a three-necked flask, followed by adding 1.0 g of calcium lignosulfonate, stirring and mixing. Then 100 mL of 1.5 mol L was added dropwise with continuous stirring -1 After dropping the NaOH solution, continue to stir at room temperature for 20min, put it into a water bath at 70°C for reflux reaction for 30min, and obtain a flocculent precipitate. The precipitate was filtered under reduced pressure and washed with deionized water until the filtrate was clear. The obtained product was dried in an oven at 60°C for 12h. After burning at 500°C for 1 h, the obtained sample was off-white. XRD of the sample as figure 2 a.
Embodiment 2
[0023] 100mL 0.5mol·L -1 MgCl 2 The solution was added to a three-necked flask, followed by adding 2.0 g of calcium lignosulfonate, stirring and mixing. Then, under continuous stirring, 1.5 mol·L of the same volume as the magnesium chloride solution was added dropwise. -1 After the NaOH solution was dripped and continued to stir at room temperature for 30min, it was put into a water bath at 70°C for reflux reaction for 30min to obtain a flocculent precipitate. The precipitate was filtered under reduced pressure and washed with deionized water until the filtrate was clear. The obtained product was dried in an oven at 65°C for 12h. After burning at 600°C for 2h, the obtained sample was off-white. XRD of the sample as figure 2 b.
Embodiment 3
[0025] 100mL 0.5mol·L -1 MgCl 2 The solution was added to the three-necked flask, followed by adding 1.5 g of calcium lignosulfonate, stirring and mixing. Then, under continuous stirring, 1.5 mol·L of the same volume as the magnesium chloride solution was added dropwise. -1 After the NaOH solution was dripped and continued to stir at room temperature for 30min, it was put into a water bath at 70°C for reflux reaction for 30min to obtain a flocculent precipitate. The precipitate was filtered under reduced pressure and washed with deionized water until the filtrate was clear. The obtained product was dried in an oven at 60°C for 12h. After burning at 700°C for 3h, the obtained sample was off-white. XRD of the sample as figure 2 c.
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