Method for purifying ardealite based on filler flotation columns and reselection columns

Abstract

The invention discloses a method for purifying ardealite based on filler flotation columns and reselection columns. The method comprises the steps that organic matter is removed through flotation, dissoluble phosphorus and fluorine impurities are removed through reelection, silicon containing impurities are removed through reelection, through the difference of the densities, particle sizes and surface chemical characters between silicon dioxide, chalcedony, sulfate, sulfate, fluoride and carbonized organic matter in ardealite and the ardealite, the manner of combining reelection and flotationis adopted, the purification effects of decoloration, whitening, phosphorus reduction and impurity reduction of the ardealite are achieved, the ardealite can serve as building raw materials, silicon slag can serve as unfired hollow bricks or silicon soil modifier raw materials, and organic phosphorus containing impurity slag and the like can serve as water retention feeding block raw materials. Two kinds of waste water are generated at the same time and include waste water including no organic matter and soluble salt after desilicication filtering, and the waste water accounts for 2 / 3 of the total waste water quantity; and the other kind is waste water with organic matter and soluble salt filtered, the waste water accounts for 1 / 3 of the total waste water quantity, the waster can be cyclically utilized by itself after being treated, and the situation that the waste water is discharged out to pollute the environment is avoided.

Description

technical field [0001] The invention belongs to the technical field of solid waste disposal and resource utilization, and specifically relates to a method based on ore dressing and a method for purifying phosphogypsum. Background technique [0002] Phosphogypsum is a chemical by-product with calcium sulfate as the main component produced in the process of preparing phosphoric acid from phosphate rock by wet method. It takes two tons of sulfuric acid to produce one ton of phosphoric acid and produces nearly five tons of phosphogypsum. 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...

AI Technical Summary

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

Images