Preparation method of active anhydrous calcium sulfate

An anhydrous calcium sulfate and a preparation process technology are applied in the field of preparation of powder materials, which can solve the problems of low product activity and high energy consumption, and achieve the effects of reducing energy consumption, simple operation and lowering production costs.

Active Publication Date: 2013-11-20
HUNAN HENGGUANG TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the defects of high energy consumption and low product activity in the preparation method of active calcium sulfate dihydrate in the prior art, the present invention aims to provide a process for preparing highly active anhydrous calcium sulfate with simple process, low energy consumption and low cost

Method used

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  • Preparation method of active anhydrous calcium sulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] This example is illustrated by treating 1000 kilograms of calcium sulfate dihydrate per hour.

[0024] 1. For the pulverization of calcium sulfate dihydrate, use a grinder to grind the average particle size of calcium sulfate dihydrate to 3000 mesh.

[0025] 2. The combustion reaction of natural gas and preheated combustion air is used to obtain a hot air flow of 800 °C. The preheated combustion air temperature is 250°C, the combustion air flow rate is 750Nm / hour, and the consumption of natural gas is 18 cubic meters / hour;

[0026] 3. Airflow dryer is adopted. After heat exchange between calcium sulfate dihydrate and 800°C hot air in the airflow dryer, the temperature drops to 282°C, and then enters the cyclone separator, bag filter, and out of the bag filter. The tail gas temperature is 280°C. The weight of active calcium sulfate is 790 kg / h; the specific surface of the product is 97 m2 / g.

[0027] 4. Exhaust waste heat recovery device

[0028] The temperature of t...

Embodiment 2

[0030] This example takes the treatment of 1000 kg of calcium sulfate dihydrate as an example to illustrate

[0031] 1. For the pulverization of calcium sulfate dihydrate, use a grinder to grind the average particle size of calcium sulfate dihydrate to 6000 mesh.

[0032] 2. The combustion reaction of natural gas and preheated air is used to obtain a hot air flow of 900°C. The preheated air temperature is 250°C. The air flow rate for combustion is 700Nm / hour; the consumption of natural gas is 18 cubic meters / hour;

[0033] 3. Airflow dryer is adopted. After heat exchange between calcium sulfate dihydrate and 900°C hot air in the airflow dryer, the temperature drops to 282°C, and then enters the cyclone separator, bag filter, and out of the bag filter. The tail gas temperature is 280°C; the weight of active calcium sulfate is 790 kg / hour; the specific surface of the product is 120 square meters / gram.

[0034] 4. Exhaust waste heat recovery device

[0035] The temperature of...

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Abstract

The invention discloses a preparation method of active anhydrous calcium sulfate. The preparation process comprises the following steps: continuously adding calcium sulphate dehydrate powder into an airflow dryer; and enabling the calcium sulphate dehydrate powder to be in contact with high-temperature gas with the temperature of 400 to 950 DEG C which is introduced into the bottom of the airflow dryer and performing instant dehydration activating reaction to obtain airflow containing the active anhydrous calcium sulfate powder. The process is simple, low in energy consumption and quick; raw materials are widely sourced; continuous industrial production can be performed; a new technological approach for deep processing of gypsum powder industry is opened.

Description

technical field [0001] The invention discloses a preparation process of active anhydrous calcium sulfate, which belongs to the technical field of powder material preparation. technical background [0002] Anhydrous calcium sulfate is a cheap and easy-to-obtain filler that can be used as a polymer filler. Because the general calcium sulfate particles are coarse and the specific surface area is low, the reinforcement effect is far from that of other superfine powder materials. How to use a simple and effective preparation technology to obtain highly active anhydrous calcium sulfate products is of great significance. important economic value. [0003] The classic preparation of active calcium sulfate dihydrate is to grind calcium sulfate dihydrate to a fineness of 3000-6000 meshes, and heat the ground powder to above 300 degrees in a rotary kiln to volatilize the crystal water. In the rotary kiln, the calcium sulfate dihydrate powder is heated slowly, and the water volatilize...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/02
Inventor 曾维兴曹立祥伍小望
Owner HUNAN HENGGUANG TECH
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