A method for improving the whiteness of phosphogypsum by removing impurities by flotation
A technology of phosphogypsum and flotation, which is applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of environmental pollution, long process flow, high cost, etc., achieve wide application range, short process, and improve whiteness Effect
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Embodiment 1
[0035] The present embodiment provides a method for improving the whiteness of phosphogypsum by removing impurities by flotation. The treatment process is as follows: figure 1 shown,
[0036] In this example, phosphate rock in Guizhou region is used, and the main chemical component content is P 2 O 5 33.49wt%, CaO 46.97wt%, SiO 2 7.87 wt% and MgO 0.89 wt%, etc.
[0037] Step 1: First, heat the phosphoric acid solution with a mass fraction of 22% to 50 °C in a water bath, then add phosphate rock according to the solid-liquid ratio of 1kg:5 L, and finish the reaction at a constant temperature of 50 °C for 0.5h.
[0038] Step 2: transfer the suspension in step 1 into the stirring barrel, stir at 250rpm, add 150g / t cetyltrimethylammonium bromide collector, and continue stirring for 2min;
[0039] Step 3: Transfer the slurry after sizing into the flotation column, keep the aeration volume of 20 ml / min, and flotation for 5 minutes;
[0040] Step 4: Transfer the remaining suspe...
Embodiment 2
[0044] This embodiment provides a method for improving the whiteness of phosphogypsum by removing impurities by flotation method.
[0045] In the present embodiment, the phosphate rock in Hubei area is used, and the main chemical component content is P 2 O 5 31.09wt%, CaO 44.57wt%, SiO 2 8.23 wt%, MgO 1.56 wt% and Al 2 O 3 0.93 wt%, etc.
[0046] Step 1: First, heat the phosphoric acid solution with a mass fraction of 27% to 75°C in a water bath, then add phosphate rock according to the solid-liquid ratio of 1kg:9L, and finish the reaction at a constant temperature of 75°C for 3.0 hours.
[0047] Step 2: transfer the suspension in step 1 into the stirring tank, stir at 500rpm, add 500g / t tetradecyldimethylbenzylammonium chloride collector, and continue stirring for 6min;
[0048] Step 3: Transfer the slurry after sizing into the flotation column, keep the aeration volume of 120 ml / min, and flotation for 12 minutes;
[0049] Step 4: Transfer the remaining suspension in th...
Embodiment 3
[0053] This embodiment provides a method for improving the whiteness of phosphogypsum by removing impurities by flotation method.
[0054] In this example, phosphate rock in Guizhou region is used, and the main chemical component content is P 2 O 5 33.49wt%, CaO 46.97wt%, SiO 2 7.87 wt% and MgO 0.89 wt%, etc.
[0055] Step 1: First, heat the phosphoric acid solution with a mass fraction of 32% to 90°C in a water bath, then add phosphate rock according to the solid-liquid ratio of 1kg:11L, and finish the reaction at a constant temperature of 90°C for 6.0 hours.
[0056] Step 2: Transfer the suspension in step 1 into the mixing barrel, stir at 800rpm, add 800g / t mixed amine (LF4 type mixed amine produced by Kunming Liangfan Technology Co., Ltd.) collector, and continue stirring for 10min;
[0057] Step 3: Transfer the slurry after sizing into the flotation column, keep the aeration volume of 200 ml / min, and flotation for 20min;
[0058] Step 4: Transfer the remaining suspen...
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