Method for recovering yellow phosphorus from phosphorus-containing sludge by using trichloromethane

Abstract

The invention discloses a method for recovering yellow phosphorus from phosphorus-containing sludge by utilizing trichloromethane. The method comprises the following steps: A, adding trichloromethaneinto the phosphorus-containing sludge for extraction; B, standing for layering, and separating a trichloromethane solution; C, performing water bath distillation on the trichloromethane solution; andD, cooling and crystallizing a distillation residual liquid after water bath distillation, and washing with hot water to obtain yellow phosphorus. A new clean, environment-friendly and wet leaching technology is adopted; yellow phosphorus-containing sludge and water-soluble phosphorus are separated, an organic leaching agent is selected to dissolve and separate toxic and flammable yellow phosphorus in the phosphorus-containing sludge, and purification is performed to respectively obtain a high-value yellow phosphorus product and an ammonium phosphate fertilizer product, so that the phosphorus-containing sludge and wastewater are completely and effectively utilized, the ecological environment is protected, and secondary emission of any pollutants is avoided.

Description

technical field [0001] The invention relates to a method for recovering yellow phosphorus from phosphorus-containing sludge by using chloroform. Background technique [0002] Yellow phosphorus is white or light yellow translucent solid. Soft, brittle when cold, darken when exposed to light. Exposure to air produces green phosphorescence and white smoke in dark places. It is ignited at about 40°C in humid air, and slightly higher in dry air. The relative density is 1.83 (α type), 1.88 (β type). The melting point is 44.1°C (beta type). In industry, yellow phosphorus is used to prepare high-purity phosphoric acid. Using yellow phosphorus to produce smoke (P 4 o 10 ) and fog (P 4 o 10 form H with water vapor 3 PO 4 and other mist-like substances), which are often used in the military to make smoke bombs and incendiary bombs. White phosphorus can also be used to make red phosphorus (red phosphorus), tetraphosphorus trisulfide (P 4 S 3 ), organophosphates, incendiary...

AI Technical Summary

Problems solved by technology

[0003] my country's phosphate ore smelting yellow phosphorus technology adopts the traditional high-temperature fire reduction smelting old process, the technology is relatively backward, "sky lanterns", smoke, dust, thermal pollution, waste residue, waste gas, highly toxic and flammable and other pollutants are discharged, greater impact on the environment

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