A kind of decomposition method of phosphogypsum
A technology of phosphogypsum and decomposition rate, which is applied in the fields of chemical instruments and methods, inorganic chemistry, calcium/strontium/barium oxide/hydroxide, etc. It can solve the problem of reaction dead angle dosage, high energy consumption and cost, uneven mixing, etc. problems, to achieve high-efficiency catalysis, lower production costs, and lower energy consumption
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Embodiment 1
[0030] (1) Naturally air-dry, crush and grind the phosphogypsum, pass through a 100-mesh sieve to obtain phosphogypsum powder with a particle size of 100 mesh, impregnate 50g of phosphogypsum powder in 0.1mol / LFeCl 3 In the solution, when the phosphogypsum powder is in the form of a paste, stir it magnetically for 12 hours, take the filter residue after filtration, place it in an oven at 120°C, dry it for 1 hour, and get the pretreated phosphogypsum after removing free water;
[0031] (2) Take 20g of pretreated phosphogypsum and calcinate at 600°C for 60min, and at the same time, feed CO gas with a purity of 99% at a gas flow rate of 10ml / min, and monitor SO in real time with a flue gas analyzer. 2 Concentration, after the reaction is completed, cool naturally to room temperature, and measure S in the residue by iodometric method 2- Then calculate the amount of calcium sulfate and calcium sulfide in the residue according to stoichiometry, according to the following calculation...
Embodiment 2
[0035] (1) Naturally air-dry, crush and grind the phosphogypsum, pass through a 110-mesh sieve to obtain phosphogypsum powder with a particle size of 110 mesh, impregnate 50g of phosphogypsum powder in 1.0mol / LFe 2 (SO 4 ) 3 In the solution, when the phosphogypsum powder is in the form of a paste, stir it magnetically for 10 hours. After filtering, take the filter residue, place it in an oven at 110°C, and dry it for 1.5 hours. After removing free water, the pretreated phosphogypsum is obtained;
[0036] (2) Take 25g of pretreated phosphogypsum and calcinate at 620°C for 45min, and at the same time, feed CO gas with a purity of 99.9% at a gas flow rate of 13ml / min, and monitor SO in real time with a flue gas analyzer 2 Concentration, after the reaction is completed, cool naturally to room temperature, and measure S in the residue by iodometric method 2- Then calculate the amount of calcium sulfate and calcium sulfide in the residue according to stoichiometry, according to th...
Embodiment 3
[0040] (1) Naturally air-dry, crush and grind the phosphogypsum, pass through a 120-mesh sieve to obtain phosphogypsum powder with a particle size of 120 mesh, impregnate 50g of phosphogypsum powder in 0.3mol / LFe(NO 3 ) 3 In the solution, when the phosphogypsum powder is in the form of a paste, it can be stopped, magnetically stirred for 8 hours, filtered, and the filter residue is taken, placed in an oven at 100°C, dried for 2 hours, and free water is removed to obtain pretreated phosphogypsum;
[0041](2) Take 21g of pretreated phosphogypsum and calcinate at 650°C for 30min, while feeding CO gas with a purity of 90% at a gas flow rate of 15ml / min, and monitor SO in real time with a flue gas analyzer 2 Concentration, after the reaction is completed, cool naturally to room temperature, and measure S in the residue by iodometric method 2- Then calculate the amount of calcium sulfate and calcium sulfide in the residue according to stoichiometry, according to the following calcu...
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