Method for preparing soluble potassium and calcium silicate soil conditioner through alkaline activation of potassium feldspar
A kind of technology of activating potassium feldspar and soil conditioner
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Embodiment 1
[0027] Add the prepared potassium hydroxide solution with a mass concentration of 1g / L into the reaction kettle with a cooling device, and add the oxidized Potassium content is 13.94%, silicon dioxide content is the potassium feldspar powder of 66.41% (passes through 100 mesh sieves after being pulverized), and calcium hydroxide is added to adjust the Ca / Si molar ratio in the mixture to be 0.9, and after mixing evenly, react at 190° C. for 6 hours, Stir well, and after the reaction is completed, cool down to below 100°C, and the filtrate obtained after suction filtration of the reaction product is a soluble potassium solution; wash the filter residue slurry twice, and dry the filter residue at 100°C after suction filtration. After testing, K in the filter residue 2 The content of O is 1.6%, and K is calculated 2 The dissolution rate of O was 92.78%; the content of citrate-soluble silica in the filter residue was 26.88%, the content of calcium oxide was 32.01%, and the water c...
Embodiment 2
[0029] The configured potassium hydroxide solution with a mass concentration of 50g / L is added to the reaction kettle with a cooling device, and the oxidation Potassium content is 12.04%, silicon dioxide content is 65.01% potassium feldspar powder (passes through 50 mesh sieves after crushing), and calcium oxide is added to adjust the Ca / Si molar ratio in the mixture to be 0.3, after mixing evenly, react at 210°C for 1h, fully Stir and cool down to below 100°C after finishing the reaction. The filtrate obtained after liquid-solid separation of the reaction product is a soluble potassium solution; wash the filter residue slurry 3 times, and dry the filter residue at 30°C after suction filtration. After testing, K in the filter residue 2 The content of O is 1.75%, calculated K 2 The dissolution rate of O was 91.17%; the content of citrate-soluble silica in the filter residue was 23.06%, the content of calcium oxide was 8.80%, and the moisture content of the filter residue was 3...
Embodiment 3
[0031] The configured potassium hydroxide solution with a mass concentration of 30g / L is added to the reaction kettle with a cooling device, and the oxidation Potassium feldspar powder with a potassium content of 10.21% and a silicon dioxide content of 68.02% (passed through a 80-mesh sieve after crushing), adding calcium hydroxide to adjust the Ca / Si molar ratio in the mixture to 1.5, and reacting at 160°C for 4.5 hours after mixing evenly , fully stirred, after the reaction was completed, the temperature was lowered to below 100°C, and the filtrate after suction filtration of the reaction product was a soluble potassium solution; the filter residue slurry was washed 4 times, and the filter residue was dried at 120°C after suction filtration. After testing, K in the filter residue 2 The content of O is 1.13%, it is calculated that K 2 The dissolution rate of O is 90.00%, the content of citrate-soluble silicon dioxide in the filter residue is 24.06%, the content of calcium ox...
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