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A method for preparing high whiteness short columnar submicron α-hemihydrate gypsum from desulfurized gypsum

A desulfurization gypsum, sub-micron technology, applied in the field of high-whiteness short columnar sub-micron α-hemihydrate gypsum, can solve secondary pollution and other problems, achieve the effect of solving a large amount of accumulation and improving application value

Active Publication Date: 2021-08-10
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention utilizes two dissolving and crystallization processes to successfully realize the separation of colored impurities and product purification, and prepare high-whiteness submicron α-hemihydrate gypsum products. Small-grained gypsum with high whiteness and strength offers a new approach

Method used

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  • A method for preparing high whiteness short columnar submicron α-hemihydrate gypsum from desulfurized gypsum
  • A method for preparing high whiteness short columnar submicron α-hemihydrate gypsum from desulfurized gypsum
  • A method for preparing high whiteness short columnar submicron α-hemihydrate gypsum from desulfurized gypsum

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Embodiment 1: the specific operations are as follows

[0035] (1) Preparation of rhombohedral product:

[0036] Prepare N.N'-methylenebisacrylamide, water, and desulfurized gypsum according to N.N'-methylenebisacrylamide: desulfurized gypsum: water = 0.3g:9g:100mL, prepare a reaction slurry and place it in a polytetrafluoroethylene Ethylene reactor, and heated to 120 ° C for 140 minutes;

[0037] (2) filtering the slurry obtained in step (1), and washing the obtained filter cake with deionized water until neutral;

[0038] (3) Drying: Dry the product obtained in step (2) at 100°C for 4 hours to obtain the intermediate product, as shown in the attached figure 2 As shown, the product is a prismatic product with uniform appearance.

[0039] (4) The intermediate product, NaCl, succinic acid, ethylene glycol, and water are prepared according to the mass ratio: intermediate product: NaCl: succinic acid: ethylene glycol: water=18:3:0.02:0.2:100 to prepare a reaction slurry; ...

Embodiment 2

[0043] Embodiment 2: specific operation is as follows

[0044] (1) Preparation of rhombohedral product:

[0045] Prepare N.N'-methylenebisacrylamide, water, and desulfurized gypsum according to N.N'-methylenebisacrylamide: desulfurized gypsum: water = 0.3g:9g:100mL and place the reaction slurry in polytetrafluoroethylene Reactor, and heated to 120 ℃ for 140min;

[0046] (2) filtering the slurry obtained in step (1), and washing the obtained filter cake with deionized water until neutral;

[0047] (3) drying: drying the product obtained in step (2) at 100°C for 4 hours to obtain the intermediate product;

[0048] (4) intermediate product, NaCl, succinic acid, ethylene glycol, water according to mass ratio: intermediate product: NaCl: succinic acid: ethylene glycol: water=18:3:0.02:0.96:100 preparation reaction slurry;

[0049] (5) The reaction slurry obtained in (4) was placed in a polytetrafluoroethylene reactor, and reacted for 3 hours at a temperature of 120° C. and a sti...

Embodiment 3

[0051] Embodiment 3: specific operations are as follows

[0052] (1) Preparation of rhombohedral product:

[0053] Prepare N.N'-methylenebisacrylamide, water, and desulfurized gypsum according to N.N'-methylenebisacrylamide: desulfurized gypsum: water = 0.3g:9g:100mL and place the reaction slurry in polytetrafluoroethylene Reactor, and heated to 120 ℃ for 140min;

[0054] (2) filtering the slurry obtained in step (1), and washing the obtained filter cake with deionized water until neutral;

[0055] (3) drying: drying the product obtained in step (2) at 100°C for 4 hours to obtain the intermediate product;

[0056] (4) intermediate product, NaCl, succinic acid, ethylene glycol, water according to mass ratio: intermediate product: NaCl: succinic acid: ethylene glycol: water=18:3:0.02:1.61:100 preparation reaction slurry;

[0057] (5) The reaction slurry obtained in (4) was placed in a polytetrafluoroethylene reactor, and reacted for 3 hours at a temperature of 120° C. and a s...

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Abstract

The invention discloses a method for preparing high-whiteness short columnar submicron α-hemihydrate gypsum from desulfurized gypsum. The method comprises the following steps: adding N.N'-methylenebisacrylamide, water, and desulfurized gypsum into a reaction vessel for mixing to prepare a reaction slurry, and heating the slurry to 120-125°C for 2-5 hours; filtering , washed to neutral and then dried to obtain an intermediate product; mix water, intermediate product, NaCl, succinic acid, and ethylene glycol to prepare a reaction slurry; then react the reaction slurry at a temperature of 120°C to 125°C and stir for a homogeneous reaction The reaction is carried out in a device for 3 to 4 hours; after filtration and drying, a short columnar submicron α-hemihydrate gypsum with high whiteness is obtained. The invention not only solves the problem of accumulation and secondary pollution of waste resource desulfurized gypsum, but also provides a new method for producing small particle gypsum with high whiteness and certain strength.

Description

technical field [0001] The invention relates to a method for obtaining high-whiteness short-column submicron α-hemihydrate gypsum by means of dissolving crystallization and multiple crystal transformations. [0002] technical background [0003] Desulfurization gypsum is solid waste produced by calcium-based wet desulfurization in thermal power plants, and its main component is dihydrate gypsum. α-hemihydrate gypsum is called high-strength gypsum because of its high gelling strength, and it can be prepared by dehydrating dihydrate gypsum under certain conditions. According to its particle size, α-hemihydrate gypsum can be divided into micron scale and nano scale. Because the particle size of micron-sized α-hemihydrate gypsum is too large, its application in some high-end fields such as medicine is limited. In recent years, researchers have paid attention to the application of nano-submicron α-hemihydrate gypsum in the medical field, and found that nano-submicron α-hemihydra...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/26C04B11/032C04B11/024
Inventor 曹吉林郜丽丽陈学青郭宏飞秦莹陶劲文张广林
Owner HEBEI UNIV OF TECH
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