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Laboratory
First to do of brick Plant
The raw materials chemical composition and physical properties (including the internal combustion heat, etc.) need to test, meanwhile measure the moisture of green bricks when just formed.
Chemical Analysis
Chemical composition analysis is usually measured as SiO2, Al2O3, Fe2O3, MgO, CaO, magnesium oxide, sulfur gangue and loss on ignition, etc.
SiO2:  Content is too high, lower plasticity, although good for fast-drying, however the finished products with low compressive strength;
Al2O3:  If less than 12%, the mechanical strength of the products is reduced; If more than 24%, the firing temperature is increase, increasing the amount of coal;
Fe2O3:  Content too high will reduce the products refractoriness, resulting in low of sintering temperature;
CaO:  Presenting In a state of CaCo3 in raw materials, classified as hazardous substances, If the particles larger than 2mm, it is likely to cause crisp brick or burst when burning.
MgO:  More less much better, otherwise, products easily growing generate magnesium, causing white hoarfrost;
Sulfur Dagan: Being sulphate in raw material, the content should not exceed 1%. When burning, it will make SO2 and corrode production line equipment, damage workers’ health workers.
Loss on ignition: It caused by organic in raw material. More organic, bigger gap rate in the products.
 
Basic Items Content Percent
Name Item
Chemical Component SiO2 Limited 5570
Available 5580
Al2O3 Limited 1520
Available 1025
Fe2O3 Limited 410
Available 315
CaO Available 010
MgO Available 03
SO3 Available 01
Loss on Ignition Available 315
Calcareous Content 0.5mm Limited 025
20.5mm Available 02

Physical Performance Analysis
Usually measure particles composed, plasticity, shrinkage, drying sensitivity and sinterability.
Particles Composed
Particles category Particle diameter Reasonable composition
Plastic particles <0.05mm 35~50%
Filler particles 0.05mm-1.2mm 20~65%
Skeleton particles 1.2mm-2mm <30%
Plasticity : When plasticity index is 7 to 15, most suitable for middle plastic mud extrusion;
Shrinkage: If linear shrinkage <6%, It is too high to lead to cracking, affecting the quality;
Drying sensitivity: the higher raw material plasticity, the finer of the particles, also the higher of drying sensitivity. Sensitivity coefficient determines the drying process design, too high lead green bricks surface cracking.
Relationship of forming moisture content and drying sensitivity
 
Green brick molding moisture 20 26
The critical water of green bricks 14 16
Drying sensitivity coefficient 0.78 1.10

Chemical analysis of raw materials, physical properties and body molding moisture decide the feasibility of using raw materials and affect the next process design, equipment selection, kiln structure, product quality and other aspects of the production system
 
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