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    Production of unburned, which requires selection of raw materials
    2014-6-6 0:21:24

    In recent years , with the rapid development of the economy , has been gradually replaced by brick unburned into the heart. So, the production of unburned brick , to choose which requires raw materials has it?

      Suitable for the production of unburned material: fly ash, coal gangue, sand , slag , slag, slag , tail ore , lime , stone , shale, industrial waste , construction waste and so on.

      Unburned materials requirements: 1 , unburned sand as raw material use is very extensive , often with mountain sand , river sand , aeolian sand, artificial sand can also be used or waste industrial foundry sand crushed rock , but no matter which kinds of sand, shall meet the following technical requirements. Use coarse sand and uniform particle size or particle size less than 0.075m special sand .
     2 , quicklime nbsp; quality directly affects the quality of unburned lime should be chosen as high in calcium , digestion speed, high temperature digestion quicklime , their specific requirements are as follows : CaO content gt; 60%; MgO lt; 5% ; digestion rate lt; 15min; digestion temperature gt; 60 ℃; burned lime lt; 5%; lime lt; 10%, chalking gray lt; 10%.
     3 , cement : the incorporation of 10% 425 # ordinary portland cement , can improve the strength and water resistance of brick , does not crack after flooding . Otherwise, there will be general brick cracking phenomenon .
     4 , admixture : the incorporation of a small amount of additives ( booster ) , in addition to improving the strength of brick induration , but also reduce the amount of cement , reduce product cost.
     5 , water : water appropriate for high strength brick . Forming less water , the difference between the strength of the brick , the material in the mold resistance is large , one-sided pressure , not dense brick underside ; forming more water , the bottom wet, when the mold is easy to break something . When the moisture content of 3-5 % sand , water molding 10 % is appropriate. If the raw sand too much, then dropped to 8 %. Select unburned materials is very important so that the bricks can be produced and strong and beautiful.
     6 , the clay : for containing a quantity of loose particles to facilitate the mixing of cement , sand small amount of clay in the soil can be equipped with the sand . Less sand and hard clay , sand must be matched after grinding .


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