Method and device for removing impurities from phosphogypsum through electromagnetic reinforcement

An electromagnetic strengthening and phosphogypsum technology, which is applied in the field of electromagnetic strengthening phosphogypsum impurity removal, can solve the problems of low separation efficiency, inability to effectively remove heavy metals and radioactive elements, and low resource recycling efficiency, and achieves high processing efficiency and short processing time. , non-selective effect

Inactive Publication Date: 2019-11-15
KUNMING UNIV OF SCI & TECH
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  • Description
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Problems solved by technology

[0009] Aiming at the limitations of the existing phosphogypsum removal of impurities, that is, the existing separation efficiency of removing impurities in phosphogypsum is low, the resource recycling benefit is low, and the problems that heavy metals and radioactive elements cannot be effectively removed, the present invention provides a green, high-efficiency A method for removing impurities from phosphogypsum, namely a method and device for electromagnetically strengthening the removal of impurities from phosphogypsum

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  • Method and device for removing impurities from phosphogypsum through electromagnetic reinforcement
  • Method and device for removing impurities from phosphogypsum through electromagnetic reinforcement

Examples

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Effect test

Embodiment 1

[0038] Example 1: The object of treatment in this example is phosphogypsum produced during the wet production of phosphoric acid in a phosphoric acid plant, wherein the content of phosphorus impurities is 1.5%, the content of fluorine impurities is 1.2%, the content of organic impurities is 0.35%, and the oxidation of metals and heavy metals The content of substances and radioactive metal impurities is 1.3%.

[0039] 1. Acid leaching treatment: Add phosphogypsum and tributyl phosphate into the screw feeder, mix them and add them to the acid leaching tank, put the stainless steel electrode into the electrode card slot, and add the concentration of 28% sulfuric acid, the mass volume ratio of phosphogypsum to organic extractant is 1:5, the mass ratio of phosphogypsum to concentrated sulfuric acid is 1:3, turn on the heating device at the bottom of the acid leaching tank, let the system temperature reach 70°C; Calcium sulfate dihydrate is dissociated into calcium ions and sulfate ...

Embodiment 2

[0045] Embodiment 2: The processing object of this embodiment is the phosphogypsum inventory of a phosphogypsum stacking and processing center, wherein the content of phosphorus impurities is 1.1%, the content of fluorine impurities is 0.9%, the content of organic impurities is 0.22%, metal and heavy metal oxides and radioactivity The content of metal impurities is 0.9%.

[0046] Acid leaching treatment: Add phosphogypsum and carbon tetrachloride to the screw feeder, mix and stir them and add them to the acid leaching tank, put the stainless steel electrode into the electrode card slot, and add the concentration of 30 to the acid leaching tank % of sulfuric acid, the mass volume ratio of phosphogypsum to organic extractant is 1:6, the mass ratio of phosphogypsum to concentrated sulfuric acid is 1:4, turn on the heating device at the bottom of the acid leaching tank, let the system temperature reach 80°C, Calcium sulfate water dissociates into calcium ions and sulfate ions in h...

Embodiment 3

[0050] Example 3: The object of treatment in this example is desulfurized gypsum produced by flue gas desulfurization in a chemical plant, in which the content of phosphorus impurities is 1.5%, the content of fluorine impurities is 0.3%, the content of organic impurities is 0.18%, metal and heavy metal oxides and radioactivity The content of metal impurities is 1.6%.

[0051]Acid leaching treatment: Add phosphogypsum and dioctyl phosphate to the screw feeder, mix and stir them and add them to the acid leaching tank, put the stainless steel electrode into the electrode card slot, and add a concentration of 35 to the acid leaching tank % sulfuric acid, the mass volume ratio of phosphogypsum to organic extractant is 1:7, and the mass ratio of phosphogypsum to concentrated sulfuric acid is 1:5. Turn on the heating device at the bottom of the acid leaching tank and let the system temperature reach 85°C. The heterogeneous calcium sulfate dihydrate is dissociated into calcium ions an...

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Abstract

The invention discloses a method and device for removing impurities from phosphogypsum through electromagnetic reinforcement. The method comprises the steps: adding the phosphogypsum and an organic extractant into an acid immersion tank through a spiral material lifter, performing mixing with concentrated sulfuric acid so as to prepare phosphogypsum slurry, performing heating and stirring so as tomake the slurry uniform and the impurities in the phosphogypsum be leached completely, applying an electric field on the mixed slurry so as to release the impurities wrapped and adsorbed on the surface of the phosphogypsum sufficiently, sending the phosphogypsum slurry obtained after electric disassociation to a water washing tower, applying an electric field and a magnetic field on the water washing tower so as to achieve directional migration of metal, heavy metal and radioactive metal ions in the phosphogypsum slurry under the action of an electric field force under stirring, and finally performing deposition on the surface of an electrode so as to realize separation from the phosphogypsum slurry. The method and device have wide applicability and no selectivity to the content of the phosphorus gypsum impurities, a short processing time, low energy consumption, high treatment efficiency and no secondary pollution are achieved, and the metal, heavy metal and radioactive elements in phosphogypsum can be separated and recovered effectively, so that recycling use of resources is achieved.

Description

technical field [0001] The invention relates to a method and a device for electromagnetically strengthening impurity removal of phosphogypsum, belonging to the field of resource utilization of phosphogypsum. Background technique [0002] Phosphogypsum is the industrial waste that we discharge when we use the wet method to produce phosphoric acid. The utilization rate of phosphogypsum in my country is still very low, especially in the southwestern region of my country. Because of the lack of effective use of phosphogypsum, the stacking of phosphogypsum, Disposal is an increasingly important issue affecting the environment. Impurities contained in phosphogypsum are the main reason for limiting the utilization rate of phosphogypsum. [0003] The main component of phosphogypsum is calcium sulfate dihydrate. The mass fraction of calcium sulfate in phosphogypsum generally exceeds 80%, or even exceeds 90%, but its utilization rate is low. The main reason is that phosphogypsum conta...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/02C04B11/032
CPCC04B11/02C04B11/032
Inventor 瞿广飞李恒宁平李军燕
Owner KUNMING UNIV OF SCI & TECH
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