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A method for preparing α-type high-strength gypsum from phosphogypsum dihydrate

A technology of phosphogypsum dihydrate and high-strength gypsum, which is applied in the field of α-type high-strength gypsum, can solve the problems of high energy consumption and high economic cost, and achieve the effects of improving recovery, mitigating pollution, and mild reaction conditions

Active Publication Date: 2020-09-18
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen that when these technologies use dihydrate phosphogypsum as raw material to prepare α-type high-strength gypsum, there are phosphogypsum purification and impurity removal treatments, high-temperature autoclaving, and the need to add crystal modifiers to control the crystal form of α-type hemihydrate gypsum. This is not only the production process. Good energy consumption and high economic cost

Method used

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  • A method for preparing α-type high-strength gypsum from phosphogypsum dihydrate
  • A method for preparing α-type high-strength gypsum from phosphogypsum dihydrate

Examples

Experimental program
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Effect test

Embodiment 1

[0026] A method for preparing α-type high-strength gypsum from phosphogypsum dihydrate, comprising the following steps:

[0027] (1) slurry preparation: take by weighing 60g phosphoric acid solution (P 2 o 5 Mass concentration is 29%), 1g of sulfuric acid (98%), 40g of phosphogypsum dihydrate, mixed and stirred evenly to make slurry;

[0028] (2) Preparation of gypsum seed crystals: Stir the slurry in step (1) and raise the temperature to 95° C., and keep it warm for 170 minutes.

[0029] (3) Preparation of α-type high-strength gypsum: re-prepare the slurry according to the method of step (1), stir the slurry and heat it to 95°C, then add gypsum seed crystals according to the mass percentage of gypsum in the slurry to 10%, and keep warm for 200min. After the slurry is filtered, the filter residue is washed with 95°C hot water until neutral, and the filter residue is dried to obtain α-type high-strength gypsum.

[0030] Raw material dihydrate phosphogypsum performance index:...

Embodiment 2

[0033] A method for preparing α-type high-strength gypsum from phosphogypsum dihydrate, comprising the following steps:

[0034] (1) slurry preparation: take by weighing 70g phosphoric acid solution (P 2 o 5 The mass concentration is 31%), 4g of sulfuric acid (98%), 30g of phosphogypsum dihydrate, mixed and stirred evenly to make a slurry;

[0035] (2) Preparation of gypsum seed crystals: Stir the slurry in step (1) and raise the temperature to 95° C., and keep it warm for 200 minutes.

[0036] (3) Preparation of α-type high-strength gypsum: re-prepare the slurry according to the method of step (1), stir the slurry and heat it to 96°C, then add gypsum seed crystals according to 30% of the mass percentage of gypsum in the slurry, and keep warm for 180min. After the slurry is filtered, the filter residue is washed with 95°C hot water until neutral, and the filter residue is dried to obtain α-type high-strength gypsum.

[0037] Product performance indicators: total P 2 o 5 C...

Embodiment 3

[0039] A method for preparing α-type high-strength gypsum from phosphogypsum dihydrate, comprising the following steps:

[0040] (1) slurry preparation: take by weighing 75g phosphoric acid solution (P 2 o 5 Mass concentration is 32%), 5g sulfuric acid (98%), 25g phosphogypsum dihydrate, mix and stir evenly and make slurry;

[0041] (2) Preparation of gypsum seed crystals: Stir the slurry in step (1) and raise the temperature to 90° C., and keep it warm for 200 minutes.

[0042] (3) Preparation of α-type high-strength gypsum: re-prepare the slurry according to the method in step (1), stir the slurry and heat it to 97°C, then add gypsum seed crystals according to 50% of the mass percentage of gypsum in the slurry, and keep warm for 180min. After the slurry is filtered, the filter residue is washed with 95°C hot water until neutral, and the filter residue is dried to obtain α-type high-strength gypsum.

[0043] Product performance indicators: total P 2 o 5 Content 0.18%, stan...

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Abstract

The invention discloses a method for preparing α-type high-strength gypsum from dihydrate phosphogypsum. After preparing slurry with dihydrate phosphogypsum, phosphoric acid solution and sulfuric acid solution as raw materials, it is used to prepare gypsum seed crystals, and then the prepared gypsum The α-type high-strength gypsum is prepared by adding crystal seeds to the slurry mixed with dihydrate phosphogypsum, phosphoric acid and sulfuric acid. The mixed solution of phosphoric acid and sulfuric acid filtered in the production process of the invention can be recycled, not only recovering the P remaining in phosphogypsum dihydrate 2 o 5 , but also has the advantages of low energy consumption and low cost.

Description

technical field [0001] The invention relates to a method for α-type high-strength gypsum, in particular to a method for preparing α-type high-strength gypsum from dihydrate phosphogypsum. Background technique [0002] Phosphogypsum is an accompanying substance in the wet process of phosphoric acid production, and its main component is CaSO 4 2H 2 O, containing a small amount of impurities such as phosphorus, fluorine, and organic matter, every ton of P produced 2 o 5 Discharge about 5t of phosphogypsum. my country is a large agricultural country, but also a country with a large demand for fertilizers. With the development of the national economy and the continuous growth of agricultural demand for phosphate fertilizers, my country's phosphate fertilizer industry has developed rapidly. The rapid development of the phosphate fertilizer industry has also brought some problems. In the production of wet-process phosphoric acid, a large amount of phosphogypsum is by-produced. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/26C04B11/032
CPCC04B11/024C04B11/032C04B11/26
Inventor 杨林曹建新
Owner GUIZHOU UNIV
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