Method for demagging ground phosphorite and preparing MgHPO4.3H2O
A technology of mghpo4·3h2o, phosphate rock powder, applied in the direction of improving process efficiency, can solve the problems of high consumption, no demagnesization of phosphate rock, etc., to prevent phosphorus loss, inhibit the generation of phosphoric acid, and promote crystal forming. Effect
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Embodiment 1
[0038] (1) Take 0.25 volume of phosphoric acid with a mass percentage concentration of 85%, and 0.02 volume of 36%~38% hydrochloric acid, and slowly add them to 1 volume of water, and prepare a dilute compound demagnesizing agent solution for use;
[0039] (2) After the ore grinding and washing section, take the P-containing 2 o 5 The mass fraction is 29.1%, the MgO mass fraction is 3.6%, and the particle size is 100 mass parts of Yichang phosphate rock powder of 70% crossing 100 mesh sieves, placed in the reactor; Add 0.2 mass parts of sodium dodecylbenzenesulfonate, Add 0.5 parts by mass of sodium polyphosphate, add 300 parts by mass of water to make a slurry; then enter the phosphate rock demagnesization section: control the temperature at 60°C, stir at 500r / min, and slowly add the previously prepared slurry at a rate of 0.2 to 1ml / min The compound demagnesizing agent dilute solution, adjust the pH of the control system in the range of 2~4, react for 50min, and demagnesizi...
Embodiment 2
[0045] (1) Take 0.15 volume of phosphoric acid with a mass percentage concentration of 45%, 0.01 volume of 36%~38% hydrochloric acid, and 0.01 volume of 65%~68% nitric acid, and slowly add them to 1 volume of water to prepare a compound magnesium removal agent dilute The solution is ready for use;
[0046] (2) Take P 2 o 5 The mass fraction is 28.3%, the MgO mass fraction is 2.8%, and the particle size is 100 mass parts of Pearl Phosphate Rock Powder 60% through a 100 mesh sieve, placed in the reactor, adding 0.01 mass part of cetyl ammonium bromide, carbonic Add 0.1 parts by mass of sodium and 400 parts by mass of water to form a slurry, control the temperature at 70°C, and slowly add the demagnesing agent at a rate of 0.2~0.5ml / min at a stirring rate of 450r / min, and control the pH at 2~ 4 Reaction for 30 minutes, magnesium removal is complete;
[0047] (3) The solid-liquid mixture after the demagnesization reaction in step (2) is vacuum filtered for more than 2 minutes u...
Embodiment 3
[0052] (1) Take 0.25 volume of phosphoric acid with a mass percentage concentration of 20%, and 0.025 volume of 98% sulfuric acid, and slowly add them to 1 volume of water, and prepare a dilute compound demagnesizing agent solution for use;
[0053] (2) Take P 2 o 5 The mass fraction is 24.3%, the MgO mass fraction is 6.7%, and the particle size is 100 mass parts of Baokang phosphate rock powder with 60% crossing 100 mesh sieves, placed in the reactor, and 0.2 mass parts of cetyl ammonium bromide is added, 0.1 part by mass of polysorbate, 0.3 part by mass of sodium polyphosphate, 0.1 part by mass of sodium chloride, and 250 parts by mass of water were added to form a slurry. The temperature was controlled at 60°C. Slowly add the magnesium removal agent at a rate of 1 / min, control the pH at 2~4 and react for 90 minutes, and the magnesium removal is completed;
[0054] (3) Centrifuge the solid-liquid mixture after the magnesium removal reaction in step (2) at a speed above 200...
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