Cement/Concrete Solid Brick Block Making Machine With Qtj4-40

Cement/Concrete Solid Brick Block Making Machine With Qtj4-40

These three extrusion methods are based on the difference in the moisture content of the molding.When the moisture content more than 16%,wet billet molding is plastic extrusion molding. When the moisture content equals 14-16%, it’s semi-hard plastic extrusion molding. When the moisture content equals 12-14% ,it’s hard plastic extrusion molding.Blank forming includes: feeding material , mixing,adding water and grinding equipment processing before raw materials entering the molding shop not brick extruding machine.After passing through the molding brick machine, the qualified mud and wet billet are formed.Forming process should fulfill the requirement of the shape and structure.Forming is the foundation of the brick making process.The quality of the formed body is directly related to the appearance quality of the finished tile.

After the wet billets formed from the molding plant, they need to be dried by dehydration.In the production process of sintered bricks, there are two ways of drying wet blank: natural drying and artificial drying.

Cement/Concrete Solid Brick Block Making Machine With Qtj4-40

The plasticity index of common brick clay is relatively stable.In terms of this type of material, which depends on crushing process reducing particle size to obtain plasticity, its plasticity index is variable during processing.For example, when a certain coal gangue is crushed below 0.9 mm in the laboratory, according to geotechnical test method, the plasticity index is measured as only 7.2%.However, after adding 40% of excessively fired vermiculite (essentially no plasticity),then adding water, aging, and crushing on the roller, vacuum extrusion,plasticity index of the small sample actually reached 10.5%.For example, when other shales were crushed to less 0.9 mm, the plasticity index is measured as 8.4% according to geotechnical test method.However, after adding 40% (by weight) of fly ash,then mixing with water, aging, and crushing,plasticity index of the small sample extruded by the vacuum extruder reached 9.5%.

Cement/Concrete Solid Brick Block Making Machine With Qtj4-40

This is still the result after revalidation according to the geotechnical test method,which fully demonstrates that the current geotechnical test method used in the brick and tile industry can’t correctly reflect the characteristics of raw materials such as coal gangue and shale during processing and forming.In order to further prove the fact that raw materials such as shale or coal gangue relys on reducing the particles size to obtain plasticity, the hard shale in a place near Shijiazhuang was crushed into two groups in the laboratory.One group all can pass 0.9 mm sieve; the other can all pass 0.5 mm sieve.However, the shale of the same mineral composition differs greatly in its plasticity index only due to its different grain sizes, one being 4.8% (0.9 mm) and the other being 8.9% (0.5 mm).In order to further verify this phenomenon, this two groups were blended together in different proportions to determine their plasticity index, drying line shrinkage rate and drying sensitivity index. The results are shown in the following table.

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