Method for recycling phosphogypsum solid waste
A phosphogypsum and resource technology, applied in the field of solid waste resource utilization, can solve the problems of corrosive structural materials, great impact on surrounding ecology, and large land occupation by phosphogypsum storage yards, so as to speed up treatment, prevent secondary pollution, To achieve full utilization of the effect
Inactive Publication Date: 2014-12-24
CHINA NAT OFFSHORE OIL CORP +2
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Problems solved by technology
[0005] There are mainly two types of phosphogypsum storage yards: valley type and flat type. Phosphogypsum storage yards occupy a large amount of land and have a great impact on the surrounding ecology. At the same time, phosphogypsum storage yards are a source of man-made debris flows with high potential energy. Huge disasters and losses to industrial and agricultural production and downstream people's life and property
[0006] At present, the comprehensive utilization technologies of phosphogypsum mainly include building material products technology, cement co-production sulfuric acid and cement retarder technology, etc., because these technologies contain free sulfuric acid, phosphoric acid and hydrofluoric acid in phosphogypsum, they will make plaster of paris used in construction It is corrosive to structural materials, or corrodes the model and equipment for making gypsum prefabricated parts, and prolongs the solidification time of gypsum. The actual effect is not ideal.
Method used
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Embodiment 1
[0024] (1) Dilute the flushing water in the seepage pool at 80m 3 / h flow rate is pumped into the reactor, and 0.4t / h quicklime is added for stirring;
[0025] (2) The mixed slurry generated in the reaction kettle is introduced into the first plate and frame filter press for extrusion, and the extrusion water is discharged into the clear water pool, and the solid sediment is sent to the chemical reagent factory, and is produced by reacting with concentrated sulfuric acid. Three chemical reagents: hydrofluoric acid, phosphoric acid and calcium sulfate;
[0026] (3) Put the clean water in the clear water pool at 80m 3 / h flow rate is pumped into the flushing tank, and 4t / h phosphogypsum is added for stirring;
[0027] (4) Import the phosphogypsum slurry into the second plate and frame filter press for extrusion, discharge the extrusion water into the seepage tank, and send the obtained calcium sulfate solid waste to the building materials factory for the production of building...
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The invention discloses a method for recycling phosphogypsum solid waste, which comprises the following steps: pumping flushing water in an infiltration basin into a reaction kettle, adding quicklime into the reaction kettle, and stirring; introducing mixed slurry generated in the reaction kettle into a plate and frame filter press, extruding, discharging extrusion water into a clean water basin, sending the solid precipitate into a chemical reagent plant, and reacting with concentrated sulfuric acid to prepare the chemical reagents hydrofluoric acid, phosphoric acid and calcium sulfate; pumping the clean water in the clean water basin into a flushing tank, adding phosphogypsum, and stirring; and introducing the phosphogypsum slurry into a plate and frame filter press, extruding, discharging the extrusion water into the infiltration basin, and sending the calcium sulfate solid waste into a construction material plant to produce bricks, precast slabs and other construction materials or cement retarders. The method saves the resource and can prevent secondary pollution.
Description
technical field [0001] The invention relates to the utilization of solid waste resources, in particular to a method for utilization of phosphogypsum hazardous waste resources. Background technique [0002] Phosphogypsum is a by-product of sulfuric acid extraction of phosphate rock to produce phosphoric acid (wet process phosphoric acid). Phosphoric acid is mainly used in the phosphate fertilizer industry, so phosphogypsum waste residue is mainly produced in the phosphorus chemical industry (phosphate fertilizer) industry. [0003] The main component of phosphogypsum is CaSO 4 2H 2 O, with a pH value of about 1.5 to 4.5, is acidic and has a high water content. The free water contained in it can reach 20%-25%. The free acids are mainly sulfuric acid, phosphoric acid and hydrofluoric acid. Studies have shown that the concentration of inorganic fluoride (excluding calcium fluoride) in the phosphogypsum solid waste of enterprises using wet slag transportation is greater than 10...
Claims
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IPC IPC(8): C04B11/26C01B7/19C01B17/74C01F11/46
Inventor 张保华李波孔祥军刘艳武王亮雷岗星
Owner CHINA NAT OFFSHORE OIL CORP