FIELD OF INVENTION:

This invention relates to building construction. A particularly preferred form of the invention relates to construction of building walls, ceilings, etc., which can be used as an alternative product to normal natural gypsum POP, and is derived from fertilizer companies as the by¬product (PhosphoGypsum)having a life-long guarantee.

BACKGROUND
The natural gypsum POP absorbs greater amount of water while being applied on walls. Moreover, it takes ample time for setting, do not deliver a smooth texture, and there is probability for catching fire.On the contrary, Phospho Gypsum POP is water proof, fire proof, sets quickly, and delivers a smooth finish (400 - 600 mesh) in comparison to normal natural gypsum POP.

SUMMARY OF THE INVENTION

PHOSPHO Gypsum Wall Plaster is a new technology product, and is stepping forward to make a revolution in the world of building construction. Phospho Gypsum is dried and calcinated using the calciner, then the calcinated phosphor gypsum is mixed along with F.E. Emulsion,Silicon Fine Powder, TT Dioxide, Calcined Plaster and Retardan Pin the right composition.

Phospho Gypsum's importance being its economical features, which assures a saving of 50 % of the total construction cost and time in comparison with the normal construction materials. In the production stage no sand or cement is used. The amount of water used is comparatively very less when compared with ordinary plasters.

DETAILED DESCRIPTION

Current situation and utilization of FGD gypsum

Today, natural gypsum is most popular and considered to be the most efficient technology in the So2-control project. Also, it is the sole commercialized desulfurization technique available today. The technology is further classified in to wet, dry and semidry method according to the process feature. Among these, the wet method is the most popular being 90% in Germany, 92% in United States and 98% in Japan.

Phospho gypsum has same basis (CaSo4-2H20) as well as similar chemical property in comparison with natural gypsum. Being an industrial byproduct, it has features like more water, incompact fine grain and impurities similar to other chemical gypsum. The impurities are inorganic and insoluble. The high technical requirements in the natural gypsum and fineness of CaO in the lime stone powder ensures the chemical composition of phospho gypsum. Hence, phospho gypsum is easiest among other chemical gypsum. It also has high purity (the content of CaSO^FkO is up to 85—95%), which is most appropriate for the production of construction gypsum powder. Thus, the obtained phospho gypsum offers high performance.

Moreover, phosphor gypsum is a cheap raw material of good quality that is purified highly for gypsum processing industry under appropriate craft, equipment condition and technology.

The production process - brief introduction

Normally, natural gypsum contains more than 10% free water. On the contrary, phosphor gypsum adopts a two-method on calciningphosphor gypsum. The raw gypsum is pre-dried and then calcined in calciner.
Initially, the raw materials from the storage yard are delivered by the loading machine to the feeding hoper. Then, it is delivered by the belt conveyor after measure for rotary dryer for dehydrating free water. Afterwards, the material collector collects it and then it is put to the calciner by the hoisting equipment for getting calcinated. Once calcination is done, the materials are transported to ball mill for grinding and modifying purpose. Finally, it is sent to the branch warehouse of the silo by the elevator for storage.

Calciner - Craft introduction
The demand for gypum is increasing as the gypsum industries are developing, and the manufacturing process has also been improved over time. Calcination is the key link in production and process of phosphor gypsum. Hence, new dehydrating calciner has been developed for producing phosphor gypsum.

Working principle
Working principle for calciningsystem (calciner):
The calciner's main body comprises of fine diameter intensive radiator pipes. Thermal oil is fed into the coil pipes. Then, the heat is released into powder by the heat exchanger. The roots blower that is installed at the bottom of the calciner puts the cooling air into furnace by the grid plate. The phosphogypsum powder is blowed by the cooling air in the furnace to reach the boiling state. When a specific temperature reaches, the calcined gypsum powder will lighten and starts flowing to the outlet automatically. Hence, this phospho gypsum is stable in quality. Moreover, it is easy to control the free water content as well as both initial and final setting times. Apart from this, the equipment also adopts dry electric precipitator. Also, the dust collection efficiency is more than 95%.

1. Simple and durable equipment
Since the materials has come true fluidization, the boiler do not need any rotary components. Thus, it simplifies the structure maintenance and manufacture. As it uses low temperature heat source, the furnace will not damage at any case. Moreover, the life span is much greater than the normal variety.

2. Compact and space saving
Calciner being vertical equipment, the dust collector that is installed on the top, act as the whole.Hence, it saves space, avoids moisture condensation occurring on the dust collector's corona lines.

3. Low energy consumption
Calciner does not consume more electric and heat energy.

RAW MATERIALS FOR PHOSPHO GYPSUM POP

F.E. Emulsion
Silicon Fine Powder
TT Dioxide
Calcined Plaster
RetardanP

Initially, the PHOSPHO gypsum is washed, dried, calcined (300 to 600 mesh), grinded and the necessary adhesives, and chemicals are added and stirred to make phosphor gypsum pop, which is then packed using a fully automatic gypsum wall putty making machine. Phospho Gypsum is about 89%, FE Emulsion 1%, Hydrated lime powder 5 % and other chemicals 5%.

The chemical reaction is:-
[CaS04,2H2 + heat] = [CaS04, Vi H2O] +1.5 H2O
(Calcination under atmospheric pressure and elevated pressure to produce Phospho gypsum POP)

I claim,

1. A method of manufacture of a new phospho gypsum plaster of paris for construction of buildings made up of calcinated phospho gypsum as primary composition along with F.E. Emulsion, Silicon Fine Powder, TT Dioxide, Calcined Plaster, Retardan P in the right composition are added and stirred to make phosphogypsum POP, which is then packed using a fully automatic gypsum POP making machine.

2. A phospho gypsum plaster of paris as claimed in claim 1.

3. A phospho gypsum plaster of paris as claimed in claim 1 wherein the plaster of paris prepared is waterproof and fireproof and the plaster of paris prepared sets quickly and has a smooth finish (400 - 600 mesh)