Method of using dolomite to produce magnesium chloride hexahydrate and coproduce calcium carbonate products
A technology of magnesium chloride hexahydrate and dolomite, applied in the directions of magnesium chloride, calcium carbonate/strontium/barium, chemical instruments and methods, etc., can solve problems such as complicated production process, and achieve simple production technology and equipment, improve productivity, and low cost. Effect
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Embodiment 1
[0028] (1) Crushing the dolomite raw ore to 2mm, processing it into dolomite blocks, calcining the dolomite blocks at 900°C for 3 hours to obtain lightly burned dolomite, and recovering the generated carbon dioxide gas;
[0029] (2) Grind light-burned dolomite to -100 mesh to obtain light-burned dolomite powder, prepare light-burned dolomite powder and water at a weight ratio of 1:10 to make a slurry, add anhydrous calcium chloride to the slurry, Its addition amount is n(MgO):n(CaCl 2 )=1:1, send the slurry after adding anhydrous calcium chloride to the reaction kettle, pass carbon dioxide gas into the slurry, adjust the carbon dioxide pressure in the reaction kettle to 0.5MPa, and the reaction temperature is 50°C. When the pH of the slurry=7.0, the aeration was stopped, and the stirring speed was 200r / min during the reaction to obtain the reaction slurry;
[0030] Filter the reaction slurry to obtain filtrate and filter residue, crystallize the filtrate at a low temperature ...
Embodiment 2
[0036] (1) Crushing the dolomite raw ore to 3mm, processing it into dolomite blocks, calcining the dolomite blocks at 950°C for 2 hours to obtain lightly burned dolomite, and recovering the generated carbon dioxide gas;
[0037] (2) Grind light-burned dolomite to -100 mesh to obtain light-burned dolomite powder, prepare light-burned dolomite powder and water at a weight ratio of 1:7 to make a slurry, add anhydrous calcium chloride to the slurry, Its addition amount is n(MgO):n(CaCl2 )=1:1.2, send the slurry after adding anhydrous calcium chloride to the reactor, pass carbon dioxide gas into the slurry, adjust the carbon dioxide pressure in the reactor to 0.8MPa, and the reaction temperature is 80°C, and put it into the slurry When the pH=7.5 of the slurry, the aeration was stopped, and the stirring speed was 400r / min in the reaction process to obtain the reaction slurry;
[0038] Filter the reaction slurry to obtain filtrate and filter residue, crystallize the filtrate at a lo...
Embodiment 3
[0044] (1) Crushing the dolomite raw ore to 10mm, processing it into dolomite blocks, calcining the dolomite blocks at 1000°C for 1.5 hours to obtain lightly burned dolomite, and recovering the generated carbon dioxide gas;
[0045] (2) Grind light-burned dolomite to -100 mesh to obtain light-burned dolomite powder, prepare light-burned dolomite powder and water at a weight ratio of 1:5 to make a slurry, add anhydrous calcium chloride to the slurry, Its addition amount is n(MgO):n(CaCl 2 )=1:1.1, send the slurry after adding anhydrous calcium chloride to the reactor, pass carbon dioxide gas into the slurry, adjust the carbon dioxide pressure in the reactor to 0.6MPa, and the reaction temperature is 60°C, and put it into the slurry When the pH=7.2 of the slurry, the aeration was stopped, and the stirring speed was 500r / min in the reaction process to obtain the reaction slurry;
[0046] Filter the reaction slurry to obtain the filtrate and filter residue, crystallize the filtra...
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