[De the dynamic the calciner]: de furnace is the newly developed gypsum dynamic calciner. Having dispersed, classification, drying, calcining function rapid airflow, for the combination of one of the firing device.

Domestic self-developed airflow calcined device.

 

▲ shape of a vertical cylinder, with the scrambler at the bottom in a vertical axis and the motor associated produce rotary motion, one side in the lower portion of the feed, the lower portion of the other side is passed into the hot air, the top of the material to trap gas the solid separation the wind sent to storage silos.

 

▲ basic principle is: the material under the combined effect of the high-speed hot air and spin the rotor blades of gypsum powder particles of gas-solid ratio increased, the surface of each particle quick touch of heat, particles off crystal water burst at the same time, so fully calcined, specific surface area than before firing is improved.

 

▲: suitable for gypsum, phosphogypsum drying flash burn. Continuous operation, fast heat exchange, there is no aggregate phenomenon, the the gypsum particles suspended calcined full, from feeding to feeding only a few seconds.

 

▲ gypsum binder standard consistency with decreasing particle size, the setting time of the particle size decreases shorter, the compressive strength of standard consistency law. This shows that the gypsum binder water demand and compressive strength is the the chemical gypsum particle size, while the impact of the the chemical gypsum binder setting time of the main factors is the soluble impurities in chemical gypsum.

De calciner production of gypsum powder with good particle pole.

 

▲ gypsum calciner exhaust about 80 ℃, about 20,000 m3 / h, can supply gypsum block dryer that take full advantage of the heat and shorten the drying time of the gypsum block (Anhui company about 2 hours drying 70 -80% BLOCK moisture).

 

 

Gypsum, phosphogypsum (the chemical gypsum) calcining process Introduction

 

Desulfurization gypsum-containing surface water is generally about 12%, phosphogypsum containing surface water is generally about 25%. Phosphorus gypsum, sulfur, gypsum, also known as chemical gypsum. Characteristics of chemical gypsum in 2005, the company's science and technology workers after a lot of research, testing, development, the original drying, calcination two-step process improvements for the one-step process. De dynamic calciner device to complete the four steps: 1. Beaten. 2. Drying. 3 classification. 4. Calcination. Out surface water first, then prolapse the part of the water of crystallization can be obtained gypsum building, the device will be in the production process of drying and calcining sub-step process the process, so that not only the higher performance can be obtained hemihydrate gypsum; but also reduces the cost of equipment investment .

Process: chemical gypsum fed by the feeder dry, decentralized, hierarchical, the calcined functional de calcination furnace, high temperature hot air into the furnace to a gas-solid mixing, rapid heat and mass transfer, and rotating flow, After a few seconds of that calcined into building plaster. Through two gas-solid separation, powdered gypsum powder can be used as the gypsum block building materials products.

 

Drying - the calcination process characteristics

        The test results of the calcined gypsum powder:

1, the flexural strength: 3MP

2, compressive strength: 5MPa

3, the initial setting time: 3 minutes

4, the final setting time: 8 to 10 minutes.

5, pulverized, dried, calcined, classification in the completion of the calciner. The whole process within a few seconds to complete.

 

Principle and characteristics of the calcined equipment

 

The [de dynamic calciner basic principle:

Domestic self-developed airflow calcined device. The outer shape of a vertical cylinder, with the scrambler at the bottom in a vertical axis and the motor associated produce rotary motion, one side of the lower feed, the lower portion of the other side is passed into the hot air, desulfurization gypsum powder in common to the rotary blade and the tangential hot air gypsum powder under rotation dispersion, rising spiral. Blade material and the hot gases are quickly dispersed by the de furnace bottom rapid mixing into a high solid-gas ratio suspension decomposition, generates a rotary motion in the axial direction of the furnace body, rapid heat exchanger so that the material and the heat carrier, to achieve the purpose of dihydrate gypsum dehydration, this way can also be referred to swirl calcination.

Chemical gypsum powder stripped off the surface water in de furnace crystal water; into the building gypsum powder. The top of the material to trap gas-solid separation mechanical transport to storage silos.

 

[Features]:

Continuous operation, fast heat exchange, there is no aggregate phenomenon, chemical gypsum powder particles suspended gas-solid ratio increased in the high-speed hot air and rotating blades together, each particle surface quickly touch calories particles off crystal water burst so calcined sufficiently increase the specific surface area than before calcination. From feeding to feeding only a few seconds. Calcined particle size distribution is much wider than before calcination, is conducive to the strength of the gypsum powder.

The gypsum binder standard consistency with decreasing particle size, setting time as the particle size decreases shorter compressive strength showed a standard consistency rule. This shows that the gypsum binder water demand and compressive strength is the the chemical gypsum particle size, while the impact of the the chemical gypsum binder setting time of the main factors is the soluble impurities in chemical gypsum.

De calciner production of gypsum powder with good particle pole.

De furnace is a combination of the advantages of the above equipment newly developed dynamic gypsum calciner. Having dispersed, classification, drying, calcining function, for the combination of one of the fast flow firing device.

 

Calcined sulfur gypsum conditions and requirements

Material:

Gypsum, surface moisture content of about 12%.

Phosphogypsum surface moisture content of about 25%.

The the ignition loss rate of chemical gypsum calcined into Hemihydrates 17%.

Heating: coal-fired direct fire heating.

Calcined hot air temperature: 300 ~ 550 ℃ adjustable.

Product recovery> 99.5%.

 

Energy consumption indicators

This indicator refers to the above system desulfurization gypsum from entering the feeder to the packaging end of the process of production indicators, the accounting mainly include heat consumption, electricity consumption, and labor costs.

 

Sources of heat consumption

   Total: per ton of coal consumption of 70 kg / ton (5000 kcal Coal)

 

    ▲ calciner exhaust about 80 ℃, approximately 20,000 m3 / h, can supply gypsum block dryer that take full advantage of the heat and shorten the drying time of the gypsum block (Lujiang a company about 2 hours drying 70 - 80% Block moisture).

 

Power consumption

According to the above system supporting power: the translation of the power consumption per ton of product for: 16 ~ 20kwh

 

Covers (10 tons / year design)

De calcining system: 35 × 30 × 15 (length × width × height)