AAC machines

タイトルまたは説明

 Feasibility Report of Autoclave Aerated Concrete Production   Light coal ash autoclave aerated concrete brick features light weight, heat preservation, which is the best alternative for traditional clay brick and is popular among construction and has big Market demand. The main raw materials are wet row fly ash from power plant. The fly coal ash is the biggest pollution, coving vast land and harming the environment. So we make use of them to produce the construction materials, which is a big welfare for the nation and people and beneficial to our following generations. This creation gains the support of Ministry of Construction of People’s Republic of China.   ï¼› It applies the ordinary Portland cement, whose quality should meet the national standard GB*******9.  MgO<5%      SO2<3.5% and alkalinity should <0.6% Fineness <*0um should <*0% Lose during the calcinations should <5% Permanent set should less then *0hrs, while initial set should later than *5mins  Fine grinded lime is 0.*8mm. and weight of screen residue≤*0%(based on weight).  Active CaO>*0% Mgo＜2% Digestion speed ****5mins Digestion temperature *0℃**0℃ Over calcinations lime <2%   C. Fine coal ash The quality of the fine coal ash should meet the standard of“Silica construction product coal ash” （JC/T*******1） Fineness 0.**5um I class≤*0%；Ⅱclass≤*5%ï¼›  Fly ash quality should meet the requirements of fly ash used in silicate building products. Finess size: 0.**5um; First-degree≤*0%; sencond-degree≤*8% Ignition loss: first-degree≤7%; second-degree≤*2% content of SiO2 in total fly ash:≥*0%ï¼›SO3≤2% NaOH≤2% iron mineral:≤*5%  Powdered aluminum dough should meet the following technics requirements:solidity aluminum≥****5%,actvited aluminum content≥*0% Gas generation rate for 4 minutes from *0% to *0%, *0% when for *6 min,*0min *9%; water dispersible,no grain clusters.      Calcium sulfate requirement: use CaSO4·2H2O, and its quality must meets national standard. CaSO4·2H2O content:≥*0% P2O5 content≤3% initial set:6min; final set:*0min     each function of the raw materials Lime: supply the effective CaO, Al2O3, and the SiO2 contained in fly ash to let them reach chemical reaction generatingCa4Si6O*4(OH)4·2H2O andcalcium aluminate hydrate, which form the made products hardness. Besides,lime also supplies basicity to enable the powdered aluminum dough to have generation reaction. The energy coming from the liming to harden the cast.