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Production method of wet phosphoric acid byproducts comprising highly pure and highly white alpha-semi-hydrated gypsum and inorganic-organic compound fertilizer

A technology of hemihydrate gypsum and a production method, which is applied to fertilization devices, fertilizer mixtures, applications, etc., can solve the problems of discharging acid-insoluble impurities, etc., and achieve the effects of simple process, elimination of waste, and low energy consumption.

Active Publication Date: 2016-01-13
贵州正磷科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the problem in the prior art that the by-product gypsum of wet-process phosphoric acid is dihydrate gypsum and needs to discharge acid-insoluble impurities, the present invention provides a high-purity and high-whiteness α-hemihydrate gypsum and organic-inorganic complex Production method of mixed fertilizer

Method used

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  • Production method of wet phosphoric acid byproducts comprising highly pure and highly white alpha-semi-hydrated gypsum and inorganic-organic compound fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Raw material 1: phosphate rock, collection location: Guizhou Jinde Mining;

[0048] The main chemical composition is shown in the table below:

[0049] chemical components P 2 o 5 CaO MgO SiO 2 Fe 2 o 3 Al 2 o 3 Contentwt% 30.24 50.14 5.44 1.75 0.05 0.19

[0050] Raw material 2: sulfuric acid, concentration is 97wt%, commercially available;

[0051] Raw material 3: sodium citrate, commercially available;

[0052] Raw material 4: iron sulfate, commercially available;

[0053] Raw material 5: humic acid, commercially available;

[0054] Raw material 6: Potassium chloride: Potassium oxide content 60%;

[0055] Raw Material 7: Monoammonium Phosphate: Total Nutrients (N+P 2 o 5 )55%;

[0056] The sulfuric acid solution used in this example is obtained by diluting concentrated sulfuric acid with a concentration of 97 wt%.

[0057] A production method of wet-process phosphoric acid by-product high-purity and high-whiteness...

Embodiment 2

[0071] Raw material 1: phosphate rock, collection location: Guizhou Lufa Mining;

[0072] The main chemical composition is shown in the table below:

[0073] chemical components P 2 o 5 CaO MgO SiO 2 Fe 2 o 3 Al 2 o 3 Contentwt% 29.46 51.21 5.46 1.76 0.34 0.21

[0074] Raw material 2: sulfuric acid, concentration is 97%, commercially available;

[0075] Raw material 3: sodium citrate, commercially available;

[0076] Raw material 4: aluminum sulfate, commercially available;

[0077] Raw material 5: humic acid, commercially available;

[0078] Raw material 6: potassium chloride: potassium oxide content 60%, commercially available;

[0079] The sulfuric acid solution used in this example is obtained by diluting concentrated sulfuric acid with a concentration of 97 wt%.

[0080] A production method of wet-process phosphoric acid by-product high-purity and high-whiteness α-hemihydrate gypsum and organic-inorganic compound fertili...

Embodiment 3

[0094] Raw material 1: phosphate rock, collection location: Guizhou Lufa Mining;

[0095] The main chemical composition is shown in the table below:

[0096] chemical components P 2 o 5 CaO MgO SiO 2 Fe 2 o 3 al 2 o 3 Contentwt% 29.46 52.21 5.46 1.76 0.34 0.21

[0097] Raw material 2: sulfuric acid, concentration is 97%, commercially available;

[0098] Raw material 3: ferric citrate, commercially available;

[0099] Raw material 4: sodium dodecylsulfonate, commercially available;

[0100] Raw material 5: humic acid, commercially available;

[0101] Raw material 6: potassium chloride: potassium oxide content 60%, commercially available;

[0102] Raw Material 7: Monoammonium Phosphate: Total Nutrients (N+P 2 o 5 )56%, commercially available;

[0103] The sulfuric acid solution used in this example is obtained by diluting concentrated sulfuric acid with a concentration of 97 wt%.

[0104] A production method of wet-process p...

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Abstract

The invention relates to a production method of wet phosphoric acid byproducts comprising highly pure and highly white alpha-semi-hydrated gypsum and an inorganic-organic compound fertilizer. The method comprises the following steps: carrying out an acidolysis reaction on phosphoric acid and phosphate rock powder, adding a filter aid to a mixed slurry obtained after the reaction, carrying out solid-liquid separation, washing the obtained solid phase to obtain washing water and a solid, crushing the solid, sending the crushed solid into a granulator, reacting the crushed solid with gasified ammonia in the granulator, adding fertilizers with different formulas, granulating, drying the granulated material, screening, cooling, and packaging to obtain the inorganic-organic compound fertilizer; and introducing a clear liquid obtained after the acidolysis and solid-liquid separation into a decalcification and crystal transformation tank, adding a sulfuric acid solution and a crystal transformation agent, carrying out decalcification and crystal transformation reactions, carrying out solid-liquid separation to obtain a solid and a clear liquid, adding the solid into hot water, washing, and drying to obtain the highly pure and highly white alpha-semi-hydrated gypsum. The highly pure and highly white alpha-semi-hydrated gypsum with the advantages of excellent performances, white appearance and wide uses can be produced, and the inorganic-organic compound fertilizer can be produced by using organic matters, phosphorus and resources residual in acid insoluble substances.

Description

technical field [0001] The invention relates to a production method of α-hemihydrate gypsum and organic-inorganic compound fertilizer, in particular to a production method of wet-process phosphoric acid by-product high-purity and high-whiteness α-hemihydrate gypsum and organic-inorganic compound fertilizer. Background technique [0002] In the production process of traditional wet-process phosphoric acid, solid impurities such as acid-insoluble matter are not separated, so during the process of producing phosphoric acid by wet-process phosphoric acid, almost all solid impurities such as acid-insoluble matter enter into phosphogypsum, which greatly reduces the quality of phosphogypsum. This makes its comprehensive utilization difficult. At present, a small part of the by-product phosphogypsum is used to produce low-grade and low-quality gypsum building materials and retarders for cement. Most of the phosphogypsum is discarded and stockpiled, which not only occupies a large ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/02C05G1/00
Inventor 陈宏坤庞世花胡兆平姚华龙张西兴杨位红
Owner 贵州正磷科技有限公司
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