Preparation method of nano flaky calcium sulfate;

A nano-flaky, calcium sulfate technology, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of no nano-scale flake calcium sulfate preparation method, high energy consumption, etc., achieve enhanced reflection and refraction effects, and rich sources , The effect of simple process

Active Publication Date: 2021-06-18
GUIZHOU UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Invention patent "A Method for Preparing Anhydrous Nano Calcium Sulfate Based on Phosphogypsum" (publication number CN110342560A), invention patent "A Method for Treating Phosphogypsum Waste Residue" (CN112110470A), Gong shang et al. published Preparation and Application in HDPE of Nano-CaSO4 from Phosphogypsum. (Gong et al., ACSSustainable Chemistry & Engineering 2020, 8(11), 4511-4520) discloses a method for preparing anhydrous nano calcium sulfate based on phosphogypsum. The difference between this patent and the present invention is: (1) This invention adopts sulfuric acid and nitric acid to promote the dissolving of phosphogypsum; (2) This method needs to adopt high-pressure hydrothermal method to carry out, and energy consumption is high; (3) The nano calcium sulfate of preparation is cube or cuboid shape
[0008] At present, there is no preparation method for preparing nanoscale flake calcium sulfate by using calcium sulfate dihydrate or gypsum containing calcium sulfate dihydrate

Method used

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Embodiment 1

[0026] Embodiment 1: a kind of preparation method of nano-flaky calcium sulfate, the steps are as follows:

[0027] (1) Take a certain amount of phosphogypsum in a large beaker, add tap water and stir, pour off the upper layer of water after standing still, then add water to stir, filter, and dry at 60°C to obtain water-washed phosphogypsum, microscopic appearance of water-washed phosphogypsum See attached for elemental composition image 3 And attached Figure 4 .

[0028] (2) Add 60 mL of glycerol and 30 mL of ethylene glycol into a three-necked flask, stir at a constant temperature of 80°C for 10 minutes, add 22 mmol of disodium edetate and stir until the solution is transparent, adjust the temperature to 98°C, add 10 g of water-washed phosphogypsum, and Centrifuge immediately after stirring for 3 hours, pour off the supernatant, add boiling water, stir, centrifuge and dry at a constant temperature of 60°C to obtain nano-flaky calcium sulfate. figure 1 And attached fig...

Embodiment 2

[0029] Embodiment 2: a kind of preparation method of nano-flaky calcium sulfate, the steps are as follows:

[0030] Add 90mL of ethylene glycol, add 7mmol of diethylenetriaminepentacarboxylic acid, stir at 110°C for 30min until transparent, add 20g of calcium sulfate dihydrate, react for 6h, centrifuge while hot, add ethanol, stir and ultrasonically centrifuge, dry at 200°C to obtain nano-flaky sulfuric acid calcium.

Embodiment 3

[0031] Embodiment 3: a kind of preparation method of nano-flaky calcium sulfate, the steps are as follows:

[0032] Add 30 mL of glycerol and 60 mL of ethylene glycol into a three-necked flask, stir at 85°C for 10 minutes, add 11 mmol of disodium ethylenediaminetetraacetate and stir until the solution is transparent, add 10 g of water-washed phosphogypsum, stir at constant temperature for 4 hours, then centrifuge immediately, add ethanol and stir Ultrasonic cleaning and centrifugation, and drying at 400 °C to obtain nano-flaky calcium sulfate.

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Abstract

The invention discloses a preparation method of nano flaky calcium sulfate, which comprises the following steps: uniformly mixing glycerol and ethylene glycol at 60-80 DEG C; then adding a calcium ion complexing agent; continuously stirring until particles are dissolved; adding a calcium sulfate dihydrate sample for reaction; performing solid-liquid separation while hot after the reaction is finished; and drying the obtained solid to obtain the nano flaky calcium sulfate. According to the invention, calcium sulfate dihydrate or phosphogypsum containing calcium sulfate dihydrate and flue gas desulfurization gypsum can be added with the calcium ion complexing agent to prepare the nano flaky calcium sulfate, the process is simple, the operability is strong, and the method has the advantages of waste utilization and improvement of the comprehensive utilization value of gypsum byproducts. The nanometer flaky calcium sulfate has the characteristic that each dimension can reach the nanometer level, and has great significance in promoting high-added-value resource utilization of the ardealite.

Description

technical field [0001] The invention relates to the field of preparation of inorganic functional materials, in particular to a preparation method of nano-flaky calcium sulfate. Background technique [0002] Nano-calcium sulfate is a functional inorganic powder material, which has excellent properties such as light weight, good gelation, sound insulation, heat insulation, and flame retardancy of ordinary powder materials. It has good toughness, high strength, and easy surface treatment. It has the characteristics of nanomaterials such as strong affinity and high temperature resistance, and has the advantages of high temperature resistance and chemical corrosion resistance. It is widely used in many fields such as medicine, papermaking, environmental protection, and coatings. [0003] With the significant problem of environmental pollution caused by the stacking of industrial by-product phosphogypsum, the comprehensive utilization of phosphogypsum produced by wet-process produ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46
CPCC01F11/46C01P2004/20C01P2004/01Y02W30/91
Inventor 何敏娄金分于杰张凯刘玉飞秦兰雷阳秦舒浩徐国敏秦军
Owner GUIZHOU UNIV
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