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Controlling Part |
Full Automatic / Semi-Automatic |
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Annual capacity |
Customized (20, 000-300, 000 Tons Per Year) |
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Calcining system |
Ebullition furnace |
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Rotary kiln |
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Fuel |
Natural gas, diesel, coal, heavy oil |
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Raw material |
Natural Gypsum Rock (Content of CaSO4@2H2O >80%.) |
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Finished powder usage |
Gypsum board |
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Plaster powder |
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Setting time |
The Initial Setting Time: Shall Not Be Less Than 6 Minutes, |
1. Gypsum powder quality standard: in compliance with GB/T 9776-2008
2. Main Technology(here take Nature gypsum rock as example)
Gypsum rock - first crushing -second crushing - grinding - calcining - aging -finished products (CaSO4.1/2H2O)
After being heated and calcined with certain temperature,natural dihydrate gypsum is dehydrated and decompounded,to get the product whose major component is semi-hydrated gypsum(CaSO4.1/2H2O),that is,calained gypsum(generally slaked gypsum).According to different temperatures and pressure conditions during dehydration decomposition,the obtained product is β-Type calcined gypsum.Basic process of mechanized prouduction includes five large systems:gypsum grinding,automatic measuring system,calcination system,heat supply system,and aging&packing system.According to client's requirement,gypsum crushing system can be added to crush large gypsum rock to be with size of 0-30mm,and then conveyed into grinding system.
3.Payment conditions:
A. Payment terms: 30% T/T in advance; 70%L/C or T/T
B. We can provide quality guarantee;
C. Kunlun bank account available to make convenient for Iranian client
National Standard of Calcined Gypsum
Standard No.: GB/T 9776-2008
Scope of application:
Gelled material made by dehydrating natural gypsum(raw material). Its main component isβ-GaSO4·1/2H2O, without any admixture or additive.
The natural gypsum should be in conformity with requirements of "gypsum rock(JC/T700) for making cementing material" gypsum rock of Grade 3 or more higher grades.
Classification:
It is classified to be three grades: 3.0,2.0,and 1.6 according to its 2h strength(breaking strength).
Composition:
β-GaSO4·1/2H2O content(mass fraction) in Calcined gypsum should be not less than 60.0%.
Physical and chemical performance:
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Grade |
Fineness(Screen residue of 0.2mm square screen)/% |
Setting time |
2h strength/MPa |
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First setting |
Final setting |
Breaking strength |
Compression strength |
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3.0 |
≤10 |
≥3 |
≤30 |
≥3.0 |
≥6.0 |
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2.0 |
≥2.0 |
≥4.0 |
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1.6 |
≥1.6 |
≥3.0 |
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Note: 1Mpa=10.2kgf/cm2
Responsibility of Buyer and Seller
Prepared by Buyer
1.1 Machinery and tools for installation, commission and maintenance
1.2 Transportation tool:2 sets of forklifts
1.3 Power supply system
a. High-voltage power supply
b. Substation and distribution station
1.4. Water supply& storage and drainage system
1.5 Civil engineering: Building construction, equipment foundation(including pre-burying work), steel-concrete structure silos and pools.
1.6 Material used for making machine's platform and supporting frame of equipment
Provided by Buyer
2.1 Providing round-trip ticket and other transportation cost for the Seller's workers
2.2 Providing accommodation and all kinds of necessary extra charges for the Seller's workers during installation and commissioning and training period
2.3 Providing all necessary large tools for installation, such as crane, forklift, welder, acetylene& oxygen cutting machine, etc
2.4 Providing assistant workers to cooperate with the Seller's workers during installing according to the Seller's requirement
2.5 Usage permission for special equipment
Provided by Seller
2.1 Production equipment
2.2 Gypsum Board Production Line,
Providing installation guiding engineers and technical workers
2.3 Providing 1 team leaders and 1 interpreters
2.4 Providing equipment foundation drawings, general arrangement drawing of production line (layout plan, elevation drawing and side view drawing) within 40 days after receiving down payment
2.5 Providing equipments' operation manual during training
2.6 Providing main equipments' general assembly drawing, wiring diagram of control cabinets, PLC computer programs within 7 days after acceptance
2.7 The Seller is in charge of commissioning and training
a. Commissioning: the Seller shall send engineers and technical workers to plant site to do full-scale testing, and the Buyer shall also send assistant staff to cooperate with the Seller's people.
b. The Seller's workers in charge of commissioning will do performance operation, make on-site speeches and answer questions to Buyer's technicians and operation workers under training. During the whole process of testing, both sides shall work together. After Buyer's workers master operation technique, the Seller will hand over the whole running line to the Buyer's for operation and then the training work is finished.
2.8 Within one year after signing the Acceptance Certificate, the Seller shall provide technical consultation to the Buyer for free. If the Seller's people are asked to be on the site, the Buyer shall provide round-way tickets and accommodation abroad.
