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Method for using calcium sulfate dihydrate to rapidly prepare short cylindrical calcium sulfate hemihydrate material

A technology of calcium sulfate dihydrate and calcium sulfate hemihydrate, which is applied in the field of inorganic non-metallic materials, can solve the problems of land occupation, environmental pollution, resource waste, etc., and achieve the effects of easy pulverization, expanded application fields, and high use value

Active Publication Date: 2019-07-23
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the rapid development of my country's economy, the solid waste is increasing year by year, which not only pollutes the environment and occupies land, but also causes a huge waste of resources.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Calcium sulfate dihydrate is placed in the ball mill tank of the planetary ball mill, and ground for 30 minutes under the condition that the rotation speed of the planetary ball mill is 200r / min; the particle size of calcium sulfate dihydrate after grinding is controlled at ≤5 μm, and the Magnesium citrate (ratio 1:1) is mixed with water, wherein the mass ratio of additives to water is 1:40, and the solid-to-liquid ratio of calcium sulfate dihydrate to water is 1:6, placed in a high-pressure container, raised from 20°C The time to 120°C is 1h, the pressure is 1MPa, and it is kept at 120°C for 40min; after the reaction is completed, the separated solid phase product is placed in a blast dryer at 120°C for 30min, and the separated The liquid phase is recycled. The prepared short columnar calcium sulfate hemihydrate material belongs to the short columnar crystal material surrounded by (002), (200), (110) and (1-10) crystal planes and their symmetrical crystal planes, and i...

Embodiment 2

[0018] Place the calcium sulfate dihydrate in the ball mill tank of the planetary ball mill, and grind for 60 minutes under the condition that the rotation speed of the planetary ball mill is 50r / min; the particle size of the calcium sulfate dihydrate after grinding is controlled at ≤5μm, and mixed with additives and water, wherein The mass ratio of the additive to water is 1:100, wherein the additive is a mixture of calcium chloride and magnesium citrate (1:1), and the solid-to-liquid ratio of calcium sulfate dihydrate to water is 1:14, placed in a high-pressure container, from The time for rising from 20°C to 160°C is 3 hours, the pressure is 2MPa, and the temperature is kept at 160°C for 20 minutes; after the reaction is completed, the separated solid phase product is dried in a blast dryer at 120°C for 10 minutes , the separated liquid phase is recycled. The prepared short columnar calcium sulfate hemihydrate material belongs to the short columnar crystal material surround...

Embodiment 3

[0020] Place the calcium sulfate dihydrate in the ball mill tank of the planetary ball mill, and grind for 30 minutes under the condition that the rotation speed of the planetary ball mill is 180r / min; the particle size of the calcium sulfate dihydrate after grinding is controlled at ≤5μm, mixed with additives and water, wherein The mass ratio of additive to water is 1:90, wherein the additive is a mixture of calcium chloride and magnesium citrate (1:1), and the solid-to-liquid ratio of calcium sulfate dihydrate to water is 1:12, placed in a high-pressure container, from The time from 20°C to 150°C is 2.5h, the pressure is 1.5MPa, and it is kept at 150°C for 25min; after the reaction is completed, the separated solid phase product is placed in a blast dryer at 120°C for drying Treat for 15 minutes, and recycle the separated liquid phase. The prepared short columnar calcium sulfate hemihydrate material belongs to the short columnar crystal material surrounded by (002), (200), (...

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Abstract

The invention belongs to the field of inorganic nonmetallic materials, and discloses a method for using calcium sulfate dihydrate to rapidly prepare a short cylindrical calcium sulfate hemihydrate material. The initial structure of common calcium sulfate dihydrate after being processed recrystallizes, the crystal grows to be complete without the problem of shrinkage cavity, and the prepared shortcylindrical calcium sulfate hemihydrate material has the high using value. By means of different energy possessed by different crystal faces of the crystal, calcium sulfate dihydrate controls dissolution and recrystallization speed of crystal faces in different solution systems according to differences of energy of each crystal face, and accordingly growth behavior control of the short cylindricalmaterial is completed. The method comprises the steps of grinding of calcium sulfate dihydrate, material distribution, thermal solution reaction, separation and cooling. The method can not only effectively solve the problems that calcium sulfate dihydrate is easy to pulverize, the strength is poor, and the stability is low, but also can widen the application field of calcium sulfate, and has theimportant practical meaning on high-efficiency utilization of smoke desulfurized products and gypsum resources.

Description

technical field [0001] The invention belongs to the field of inorganic non-metallic materials, and relates to a method for rapidly preparing short columnar calcium sulfate hemihydrate materials by using calcium sulfate dihydrate. Background technique [0002] In the preparation technology of inorganic non-metallic materials, the orientation growth control technology of inorganic materials is very important, which not only affects the crystal structure properties, but also involves its application fields. As a high-strength inorganic crystal material, the short columnar calcium sulfate hemihydrate material can significantly improve the comprehensive mechanical properties of cement preparation due to its stable performance and high strength. important role. [0003] With the rapid development of my country's economy, the solid waste is increasing year by year, which not only pollutes the environment and occupies land, but also causes a huge waste of resources. In 2018, the d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/032
CPCC04B11/032
Inventor 史培阳杨文胡吕彭朋姜茂发
Owner NORTHEASTERN UNIV
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