High Output and Low Investment Gypsum Power Production Line

Product Description

Product Description

1. Brief introduction

 The gypsum stone is crushed into granule less than 25mm with crusher. It's stored in raw material silo, then conveyed into grinding mill to make gypsum powder. The powder is classified through a classifier. The qualified powder in required fineness shall be carried to the calciner, while the unqualified powder shall be returned to the grinding mill for further process. The calcined gypsum powder (it's usually called Plaster of Paris) shall be stored in the finished product silo for preparation of plasterboard raw material.
 

2. Fluidized bed calcining process:
As the gypsum industry developing, the gypsum powder demand becomes larger and larger in many fields. Meanwhile the requirement for gypsum powder quality becomes stricter. Therefore the gypsum power process improves gradually. Drying and dehydrating the raw gypsum powder is a critical process and the most difficult to control. After many years of research and experiment we have successfully developed the advanced calcining device-fluidized bed calciner, suitable for all kinds of gypsum powder production.
 
1) working principle
The fluidized bed calciner mainly is composed of dense small diameter piping coils which radiate heat of enclosed thermal oil through heat exchanger. At the bottom of the calciner a roots blower is installed.
The blower sucks cold air into the calciner through the grid plate. The blown raw powder inside the calciner becomes boiling. At certain temperature the dried and dehydrated gypsum powder turns lighter and overflows out. The finish powder has a stable quality, and its crystal water content and final setting time are easy to control. The calciner is equipped with high efficient (more than 95%) dry electrostatic precipitator to control air pollution.
 
2) Simple structure and long service life
Because the gypsum powder is fluidized during calcinating process, the calciner doesn't have rotary unit. The fluidized bed calciner structure is simpler than the traditional calciner. It's easy to manufacture. Almost no maintenance work is required from starting to production. The working heat source is low temperature that won't burn out the calciner at any circumstances. Thus it has a very long service time.
 
3)Compact and less land occupation
The calciner is vertically installed. The dust collector covers the top of the calciner to avoid dew. The two units in cooperate together. They take less land occupation. 
 
4)Low energy consumption
 The fluidized bed calciner has low heat energy and electricity consumption. Heat energy: from heat source to raw gypsum powder only little quantity of heat are lost for cold air sucken by blower and calciner body, most heat energy is used for dehydrating the gypsum powder. Its heating efficiency factor is more than 95%. However it's the second heat source of calcination. The ultimate heating efficiency shall be two efficiency factors multiplication of calciner and boiler. Steam boiler and thermal oil boiler are mature technology with high heat efficiency. The steam boiler efficiency usually reaches 60-70%, thermal oil boiler is 70-80% (we adopt for the calcination system).So the ultimate heat efficiency shall be 57-67% with steam boiler, and 67-76% with thermal oil boiler. Usually the traditional direct fired calciner use the first heat source (suitable fuel) directly which heat efficiency is less than 50%.The index of heat consumption of fluidized bed calciner is 7.7×105KJ/1000kgs gypsum. Electric energy: The fluidized bed calciner has no stirring device inside. The gypsum powder is fluidized with steam only. The blown cold air is not much. It just needs a small power blower. Therefore the fluidized bed calciner saves more electric energy than the traditional direct fired calciner.
 
5)The finished powder has good quality, ideal composition and stable physical property
    As for low calcining temperature the raw gypsum powder is hardly overheated. Just take care to control the outlet temperature. The finished powder shall not have dehydrate gypsum, the dehydrate gypsum content shall be within 5%, other is semi hydrated gypsum. The composition is ideal and the powder has a stable physical property.
    To meet the above requirement for good quality product we already developed a whole set of calcination system for gypsum powder. The equipment is mainly made of high quality steel. For example, the thermal oil piping coil is made of high quality seamless steel pipe (applied Standard: GB3087-82).Steel plates are carbon steel or low alloy steel special for boiler use (applied standard: GB713-86).Supporting stand is made of China national profile steel. In addition when welding the parts, the operator is required to have welding professional certificate. The prime thermal oil pipe coil shall have water pressure test, tested water pressure 0.5-0.6Mpa for more than 30 minutes. During the test period any water leakage is not allowed. No leakage means passed quality.
 
 




 
3.Workers per day & per shift
The crushing system: 2 workers/day (including the forklift driver)
 Grinding system and calcining system: 2 workers/8 hours (6 workers/ day)
Heating supply system: 2 workers/eight hours (6 workers/ day)
Electrician: 1worker/day
Mechanic: 1 worker/day
Total: 16 workers
 
4. Capacity
The time of production: 330 days/year×24 hours
The output of one hour: ≥8T/hour (finished powder)
 
5.Quality of final production
 Equal to or exceeding the requirement of the national calcined gypsumstandard
 
6.The requirement of the environment:
The output of the dust of the high-voltage electrostatic dust collector reaches to the local environment demands
 
7.The related parameter of the product (GB9776-88 calcined gypsum)

1. Fineness:≥80 mesh

2. Antiflex strength (it is related to the raw material): ≥1.8Mpa; compression strength: ≥3.0Mpa

3. Main component:semi-hydrated gypsum content: ≥80% adjustable
dehydrate gypsum content: <5% adjustable
Soluble anhydrous gypsum: <5% adjustable

The initial setting time: 3~8min adjustable; 
 The final setting time: 6~15min adjustable

5. Standard consistency: 78~85% adjustable

 

Packaging & Shipping

Packaging Details	Suitable package for long distance transportation wooden boxes: load electrical cabinet, small parts etc. carton boxes: load motor, screw, bolt etc. plastic package: rock wool
Port	tianjin port

 

Certifications

Company Profile

Hebei Lvjoe Machinery Manufacturing Group Co., Ltd.  was founded in 1998, which is a diversified development enterprise integrating R&D, design, production, international trade and engineering equipment. We are a strong unit with comprehensive strength in the national gypsum equipment industry.
   We have the certificate of high-tech enterprise which is issued by the nation, the certificate of Gypsum Building Materials Equipment Research Center, the CE quality system certification which is issued by the European Union, the ISO9001 quality system certification. In 2011, the Gypsum Building Materials Equipment Research Center was established. It is a municipal-level civilized unit in Hebei Province, contract-honoring and trustworthy unit.
 

FAQ

Are you a factory or a trading company?
We are a factory. All the related process commercially or technically, feel free contact us!

What information do you need to make the quotation?
The output per year, the type of the heat source, better with the gypsum ore test report. The more information we get, the suitable of the project will be. It's simple and just tell me what you want to do, we'll make it for you.

What's the after-sale service?
We'll take in charge of the installation and debugging when the product arrive your site. We will also supply 2-year-time wearing parts and spare parts for you. Solve any questions you meet.

Can you design the whole factory for us?
Yes, we not only supply the design and quotation for the production, but also the settle and wire of the whole factory.
I have a existed production line, but with some trouble. Can you test and repair for me?
Certainly. We are not merely a manufacturer. We have our own lab and R&D facilities. Thus, We have many clients consulting about the repair and upgrade, which we finally handled all the problems. Contact us directly.