Method for recovering fluorine resource from fluorination residues of feed phosphate

A technology for feed phosphate and defluorination residues, applied in calcium/strontium/barium sulfate, fluorosilicic acid, halogenated silicon compounds, etc., can solve problems such as resource utilization, reduce processing costs, increase economic benefits, and save mining Effect

Active Publication Date: 2016-08-03
龚家竹
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Problems solved by technology

However, as today's sustainable development of wet-process phosphate production technology, the existing patented technology only solves the economic problems of product quality and efficiency, but does not make...

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  • Method for recovering fluorine resource from fluorination residues of feed phosphate

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Embodiment 1

[0035] This embodiment adopts the method of continuous circulation treatment, and the percentages in this embodiment, unless otherwise specified, all refer to mass percentages.

[0036] see figure 1 , the defluorinated slag (see Table 1 for components) produced by 5000kg / h feed phosphate production, 1825kg / h98%H 2 SO 4 and 3500kg / h process water (including the gypsum washing water of the subsequent process), continuously added to the decomposition and sedimentation tank 8, maintaining the temperature of the reaction tank at 40-60 ° C, and the residence time of the material is 45-60min; for the complete material of reaction precipitation, use the first Pump 61 is sent into the second filter press 32 to filter, and 3000kg / h process water carries out countercurrent washing; Obtain 6765kg / h containing 15.24%P respectively 2 o 5 The mixed filtrate of phosphoric acid and fluosilicic acid with 9.79% F is sent to the storage tank 9 for standby; the washing liquid 3500kg / ...

Embodiment 2

[0044] As shown in the figure, the defluorinated slag wet filter cake (see Table 2 for components) in the production of 7000kg / h feed calcium hydrogen phosphate, 1825kg / h98%H 2 SO 4 and 1200kg / h process water (including the gypsum washing water of the subsequent process), continuously add in the decomposition and sedimentation tank 8, maintain the temperature of the reaction tank at 40-60 ° C, and the residence time of the material is 45-60min; for the complete material of the reaction precipitation, use the first Pump 61 is sent into the second filter press 32 to filter, and 1000kg / h process water carries out countercurrent washing; Obtain 6265kg / h containing 16.46%P respectively 2 o 5 The mixed filtrate of phosphoric acid and fluosilicic acid with 10.57% F is sent to the storage tank 9 for standby; the washing liquid 1200kg / h is returned to the decomposition and sedimentation tank 8 as process water; the gypsum filter cake 3560kg / h containing 10% of free water...

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Abstract

The invention discloses a method for recovering fluorine resource from fluorination residues of feed phosphate. According to the method, enriched fluorine compounds in the fluorination residues produced during feed phosphate production is subjected to acid dissolution to remove the calcium compounds in the fluorination residues, and after the fluorine resources enter liquid phase from solid phase, a precipitator is added to recover the fluorine resources, so that the fluorine resources discarded in the prior art are completely utilized, the economic benefit of the production is increased, the resource waste is decreased, the exploitation of fluorite resources is saved, the economic benefit and social benefit of the feed phosphate production are improved, and the chemical production requirements of sustainable development are met; meanwhile, a continuous cyclic process is adopted, so that the processing efficiency is greatly improved and the processing cost is reduced.

Description

technical field [0001] The invention relates to the field of recovery and utilization of fluorine resources, in particular to a method for recovery of fluorine resources from feed phosphate defluorination slag. Background technique [0002] Fluorine is the most electronegative element, and its reactivity is higher than any other element, with an electronegativity value of 4.0. Fluoride ion is the least polarizable anion, and the diameter of fluoride ion is 0.136nm. Due to the specificity of fluorine atoms, fluorine materials have many excellent properties, such as outstanding chemical stability, thermal stability, low surface energy, dielectric, non-combustible, aging resistance, corrosion resistance, self-lubricating, anti-sticking, anti-fouling , high temperature resistance, drug resistance and other characteristics; known as "special functional materials", widely used in military industry, aerospace, metallurgy, electronics, textiles, light industry, medicine and agricul...

Claims

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Application Information

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IPC IPC(8): C01B33/10C01F11/46
CPCC01B33/103C01F11/46
Inventor 龚家竹
Owner 龚家竹
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