Method for preparing high-strength gypsum from phosphogypsum
A technology of high-strength gypsum and phosphogypsum, applied in the field of building materials, can solve the problems of waste of resources, reduced preparation efficiency, high process control requirements, etc., and achieves the effect of standard consistency, small water consumption, good crystal morphology and superior cost performance.
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[0012] Example 1
[0013] A method for preparing high-strength gypsum using phosphogypsum includes the following steps: 1) Pretreatment of phosphogypsum: Take an appropriate amount of phosphogypsum, add tap water and wash 13 times for pretreatment according to the ratio of water to paste of 1:2.5, so that the pH is medium 2) Preparation of phosphogypsum slurry: weigh polycarboxylate (sodium citrate) at a mass ratio of phosphogypsum of 0.06% for single blending, and blend the prepared crystal transfer agent and water at a solid-to-liquid ratio of 3:1 Prepare a thick slurry in the pretreated phosphogypsum, and control the viscosity of the slurry to 0.50-0.55mpa·s; 3) Autoclave treatment: Put the prepared slurry in an autoclave at an autoclave temperature of 144℃ 4) Dry and grind autoclaved materials: dry the autoclaved materials at 110±5℃, and grind to obtain high-strength gypsum powder.
Example Embodiment
[0014] Example 2
[0015] A method for preparing high-strength gypsum using phosphogypsum includes the following steps: 1) Pretreatment of phosphogypsum: Take an appropriate amount of phosphogypsum, add tap water and wash 13 times for pretreatment according to the ratio of water to paste of 1:2.5, so that the pH is medium 2) Preparation of phosphogypsum slurry: according to the mass ratio of phosphogypsum of 0.06%, weigh the polycarboxylate (gelatin) for single blending, and mix the prepared crystal conversion agent and water into the pre-treatment at a solid-to-liquid ratio of 3:1 A thick slurry is prepared from the treated phosphogypsum, and the viscosity of the slurry is controlled to be 0.50-0.55mpa·s; 3) Autoclave treatment: Put the prepared slurry in an autoclave at an autoclave temperature of 144°C, Constant temperature 6h; 4) Drying and grinding of autoclaved materials: After drying the autoclaved materials at 110±5℃, grind to obtain high-strength gypsum powder.
Example Embodiment
[0016] Example 3
[0017] A method for preparing high-strength gypsum using phosphogypsum includes the following steps: 1) Pretreatment of phosphogypsum: Take an appropriate amount of phosphogypsum, and after multiple washings, add quicklime during the 7th and 8th washings for a total of 10 pretreatments , Make the pH value neutral; 2) prepare phosphogypsum slurry: weigh the polycarboxylate (sodium citrate) according to the mass ratio of phosphogypsum of 0.06% for single blending, and mix the crystal conversion agent and water at a ratio of 3:1 The solid-liquid ratio is mixed into the pretreated phosphogypsum to prepare a thick slurry, and the viscosity of the slurry is controlled to 0.50-0.55mpa·s; 3) Autoclave treatment: Put the prepared slurry into an autoclave, Autoclave temperature is 144℃, constant temperature is 6h; 4) Drying and grinding autoclaved material: After drying the autoclaved material at 110±5℃, it is ground to obtain high-strength gypsum powder.
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