Method for preparing ultra-fine calcium oxide with dolostone
A technology of calcium oxide and acidizing solution, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve the problem of low development and utilization of dolomite, and achieve the effects of environmental protection, uniform particles, and low price
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[0014] The invention proposes a method for preparing superfine calcium oxide from dolomite, the preparation process is simple and the production cost is low. The specific implementation method comprises the following steps:
[0015] The first step of preparation is to take 100 grams of fully crushed dolomite and calcinate it in a furnace at 900-1600°C for 3-8 hours. During the calcining process, the dolomite gradually removes CO 2 , forming calcined dolomite powder with the general chemical structure formula (Mg, Ca)O, which contains a small amount of SiO 2 , Fe 2 o 3 、Al 2 o 3 and other secondary components.
[0016] MgCa(CO 3 ) 2 →MgO+CaO+2CO 2 ↑
[0017] Take another 100-150 grams of fully broken dolomite, add it to 1-4 liters of 0.5-2mol / L hydrochloric acid solution, stir and react for 0.5-3 hours, and filter off the insoluble residue to obtain MgCl 2 and CaCl 2 The dolomite acidizing solution is the main one; the contents of Ca and Mg elements in the acidizing ...
Embodiment 1
[0027] 1) Calcining 100 grams of fully crushed dolomite powder in a furnace at 900° C. for 8 hours to obtain a dolomite calcined product whose general chemical structure is (Mg, Ca)O;
[0028] 2) Add 100 grams of fully crushed dolomite powder into 1 liter of 2mol / L hydrochloric acid solution, stir and react for 3 hours, filter out insoluble residues, and obtain dolomite acidification solution;
[0029] 3) Add the dolomite calcined product to 1000mL 30°C deionized water for digestion; remove the residue, add dolomite acidification solution, stir and react for 0.5 hours, centrifuge, wash with water, and dry in solid phase to obtain ultrafine magnesium hydroxide powder;
[0030] 4) Slowly drop 5 liters of 0.4N NaOH solution into the above separation liquid, and add 0.5 g of polyethylene glycol, react in a water bath at 90°C for 0.5 hours, centrifuge, wash with water, dry the solid phase product, and dry at 600°C Calcined in the furnace for 8 hours, cooled to obtain superfine cal...
Embodiment 2
[0032] 1) Calcining 100 grams of fully crushed dolomite powder in a furnace at 1600° C. for 3 hours to obtain a dolomite calcined product whose general chemical structure is (Mg, Ca)O;
[0033] 2) Add 150 grams of fully crushed dolomite powder into 4 liters of 0.5 mol / L hydrochloric acid solution, stir and react for 0.5 hour, filter off the insoluble residue, and obtain dolomite acidification solution;
[0034] 3) Add the dolomite calcined product to 200mL deionized water at 90°C for digestion; remove the residue, add dolomite acidification solution, stir and react for 3 hours, centrifuge, wash with water, and dry in solid phase to obtain ultrafine magnesium hydroxide powder;
[0035] 4) Slowly drop 0.5 liters of 4N KOH solution into the above separation liquid, and add 5 grams of citric acid, react in a water bath at 50°C for 5 hours, centrifuge, wash with water, dry the solid phase product, and calcinate in a furnace at 900°C After cooling for 2 hours, superfine calcium oxi...
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