Method and device for producing alpha-type gypsum in large scale with low cost

A large-scale, low-cost technology, applied in the field of large-scale production of α-type gypsum, low-cost, can solve the problems of limited application of α-type gypsum, inability to large-scale production, complex preparation process, etc., to save site space and management personnel costs , the effect of short time consumption and simple preparation process

Inactive Publication Date: 2014-12-24
HUANGSHI YANRAN IMPORT & EXPORT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to provide a low-cost, large-scale production of α-gypsum in view of the problems that the current α-gypsum preparation process is complicated, equipment investment is large, production cost is high, production capacity is low, and large-scale production cannot be performed, which limits the application of α-gypsum. Method and device for type gypsum

Method used

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  • Method and device for producing alpha-type gypsum in large scale with low cost
  • Method and device for producing alpha-type gypsum in large scale with low cost
  • Method and device for producing alpha-type gypsum in large scale with low cost

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Experimental program
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Effect test

Embodiment 1

[0028] see figure 1 , a kind of low-cost of present embodiment, the method for large-scale production of α-type gypsum, carries out according to the following steps:

[0029] (1) Select gypsum powder containing 15% of attached water, 19% of crystal water, and 93% of calcium sulfate dihydrate grade, spray 5% of the total mass of gypsum powder with water, and use a granulator to make 8-10mm dihydrate gypsum balls regiment, spare;

[0030] (2) Open the feed door 13 of the special rotary calcining kiln for α-type gypsum, start the drive motor 11 to reverse the rotation of the rotary kiln body 4 at a speed of 7r / min, and at the same time turn on the switch for heating the electric furnace body 3 to set the heating of the electric furnace body The temperature is 900°C. When the temperature of the rotary kiln body rises to 450-550°C, add the dihydrate gypsum pellets prepared in step (1) into the rotary kiln body. The amount of feed is 30% of the total volume of the rotary kiln body....

Embodiment 2

[0036] A kind of low-cost of the present invention, the method for large-scale production α-type gypsum, carry out according to the following steps:

[0037] (1) Select gypsum powder containing 10% of attached water, 20% of crystal water, and 90% of calcium sulfate dihydrate grade, spray water with 7% of the total mass of gypsum powder, and use a granulator to make 5-8mm dihydrate gypsum pellets, spare;

[0038] (2) Open the feed door of the α-type gypsum rotary kiln, start the motor to reverse the rotary kiln body, and at the same time turn on the switch for heating the electric furnace body, set the heating temperature of the electric furnace body to 800°C, and wait for the temperature of the rotary kiln body to rise When the temperature reaches 450-550°C, add the dihydrate gypsum pellets prepared in step (1) into the rotary kiln body, and the feeding amount is 40% of the total volume of the rotary kiln body. After the feeding is completed, close and seal the feeding door ;...

Embodiment 3

[0042] A kind of low-cost of the present invention, the method for large-scale production α-type gypsum, carry out according to the following steps:

[0043] (1) Select gypsum powder containing 13% of attached water, 15% of crystal water, and 95% of calcium sulfate dihydrate grade, spray 6% of the total mass of gypsum powder into water, and use a granulator to make 5-8mm dihydrate gypsum pellets, spare;

[0044] (2) Open the feed door of the α-type gypsum-specific direct-heating self-generating steam-type rotary calcination kiln, start the motor to reverse the rotary kiln body, and at the same time turn on the switch for heating the electric furnace body, and set the heating temperature of the electric furnace body to 1000°C. When the temperature of the rotary kiln body rises to 450-550°C, add the dihydrate gypsum pellets prepared in step (1) into the rotary kiln body. The amount of feed is 35% of the total volume of the rotary kiln body. And seal the feed door;

[0045] (3)...

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Abstract

The invention discloses method and device for producing alpha-type gypsum in a large scale with a low cost. The method comprises the following steps: spraying a proper amount of water into gypsum powder which comprises 10-15% of attached water and 15-20% of crystal water and has the grade of calcium sulphate dehydrate being 90-95% and preparing into dihydrate gypsum pellets; then, putting the dihydrate gypsum pellets in a rotary kiln body of a special rotary calcining kiln for alpha-type gypsum and sealing; heating the rotary kiln body by using a heating electric furnace body to evaporate the attached water and crystal water out of the dihydrate gypsum pellets in the rotary kiln body so as to form water vapor with pressure of 0.5-0.8MPa and temperature of 150-180 DEG C inside the sealed rotary kiln body; holding the temperature and pressure for 10-20 minutes under the condition so as to convert the dihydrate gypsum pellets in the rotary kiln body into alpha hemihydrate gypsum; then, switching on a decompression valve to relieve pressure and switching off the switch of the heating electric furnace body; and drying the residual water in alpha hemihydrate gypsum by using waste heat of the kiln body, and discharging and refining into 100-150 meshes powder to obtain a finished product alpha-type gypsum. The method provided by the invention is simple in process, convenient and efficient to operate, small in equipment investment and low in production cost, can be used for producing alpha-type gypsum in large scale, and is worthy widely popularizing.

Description

technical field [0001] The invention relates to an industrialized production method and device for α-gypsum, in particular to a low-cost, large-scale production method and device for α-gypsum. Background technique [0002] α-type hemihydrate gypsum (also known as α-gypsum) is widely used in many fields because of its crystals are dense short columnar crystals, small specific volume, small water-to-paste ratio, and high strength after gelation. However, due to the complex production process of α-gypsum, large investment in equipment, high production cost and high price, its usage is greatly limited. At present, research and development of new processes for the production of α-gypsum are used both at home and abroad. , and greatly reducing its production cost is listed as a major research topic for the gypsum industry. [0003] At present, the methods of preparing α-gypsum mainly use "autoclaved method" and "hydrothermal method". However, due to the limitation of the process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B11/02C04B11/028
Inventor 濮希杰
Owner HUANGSHI YANRAN IMPORT & EXPORT
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