A method for purifying phosphogypsum based on a flotation column with a filler and a gravity column

Abstract

The invention discloses a method for purifying phosphogypsum based on a flotation column with fillers and a gravity column. Differences in density, particle size and surface chemical properties between silica, chalcedony, sulfate, phosphate, fluoride, and carbonized organic matter in phosphogypsum and gypsum, using a combination of gravity separation and flotation to achieve decolorization of phosphogypsum , whitening, phosphorus reduction, and impurity reduction purification effects, gypsum can be used as building material raw materials, silicon slag can be used as unfired hollow bricks or siliceous soil conditioner raw materials, and organic phosphorus and other impurities can be used as raw materials for water retention and nutrition bowls. Two types of wastewater are produced at the same time, including wastewater without organic matter and soluble salts after desiliconization and filtration, accounting for 2 / 3 of the total wastewater; the other is wastewater filtered by organic matter and soluble salts, accounting for 1 of the total wastewater / 3. After treatment, the waste water can be self-recycled to avoid environmental pollution.

Description

Technical field [0001] It belongs to the field of solid waste disposal and resource utilization process, and it is specifically involved in a method of mineralization method and process purified phosphite. Background technique [0002] Phosphate is based on phosphorus ore, and the chemical by-product produced by calcium sulfate is the main component of calcium sulfate is produced by phosphorus ore. Two tons of sulfuric acid is consumed each of the production of one ton of phosphoric acid while producing nearly five tons of phosphite. Phosphate also contains undeaded phosphate ore, SiO 2 Aluminum oxide, iron oxide, magnesium oxide, fluorine-containing, acid-free organic substances, etc. Harm human health and biological growth, and affect the quality of phospantine products; phosphite is different from natural plaster, despite its CASO 4 · 2h 2 O is higher, but contains 0.3% to 2.0% P 2 O 5 , 0.1% to 1.5% f, wet-phosphate is acidic, and some phosphite also have high radioactivity. ...

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Problems solved by technology

Phosphogypsum also contains undecomposed phosphate rock, SiO 2 , alumina, iron oxide, magnesium oxide, fluorine-containing substances, acidic insoluble organic substances and other impurities that are harmful to human health and biological growth, and affect the quality of phosphogypsum products; phosphogypsum is different from natural gypsum, although its CaSO 4 2H 2 The content of O is relatively high, but it contains 0.3% to 2.0% of P 2 o 5 , 0.1% to 1.5% F, wet-based phosphogypsum is acidic, and some phosphogypsum is also highly radioactive. At present, the average annual stockpile of phosphogypsum in China is 50 million tons, but its comprehensive utilization rate is less than 30%. A large amount of phosphogypsum is still stored in the form of direct stacking, which not only occupies land resources, brings heavy burdens to production enterprises, but also creates potential safety hazards and environmental pollution

At present, in order to study the enrichment method of radioactive elements in phosphogypsum, technical personnel do not know how to effectively remove the radioactive elements. Radionuclide is the culprit that affects gypsum as a building material. Therefore, it is necessary to find an economically acceptable and environmentally friendly Methods Purify phosphogypsum and remove harmful impurities, which is the key to the effective utilization of phosphogypsum

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