Description : Converting kiln fired lime into quicklime for use in agriculture and building materials
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Pengujian Sand Cone
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ECO-BLACK BRICKS REPORT
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Sand Lime Bricks
Sand lime brick consists of natural raw materials such as sand, quicklime and water. Sand lime bricks can be used for exterior and interior walls. They can be also used with other building materials, for e xample wood, to build a variety of facing brickworks. Sand lime brick is a massive building material with good sound insulation, high robustness and resistance. Thanks to its strength density and so its heaviness, sand lime sound absorbing interior wall can be built. Sand lime brick has a very good go od heat storage capacity. As a result r esult all fast temperature fluctuations could be balanced. Raw materials Raw materials used in the production of sand lime bricks are silica sand, quicklime (as a binder) and water. Alternatively fly ash could be used instead of sand. The suitability of fly ash must be checked in special tests. Furthermore the production of ceme nt-bound bricks is possible. Manufacture
Every raw material is stored separately. Ac cording to the production recipe sand / fly ash and lime are weighted in weighing containers and forwarded to the mixer. Here the raw materials are ar e mixed to a homogeneous mixture in short time. According to t he sand moisture and the recipe some w ater can be added to the mixture. One mixing cycle lasts for ca. 3 minutes. A belt conveyor transports the sand lime c ompound into the reactor. After approximately two hours, t he reaction of lime and water is completed. c ompleted. Calcium oxide and water have combined to calcium hydroxide. This pre-mix is processed in the press. The press plant is the heart of o f the sand lime brick making process. The hydraulic HDP presses ar e electronically controlled and enable a uniform, one-sided or doublesided compaction over the complete brick height. The sand lime bricks are hardened by me ans of steam in hardening chambers (autoclaves). Besides pressing, this is the second most important step in the production of sand lime bricks. The freshly
pressed bricks are hardened inside the autoclaves at a temperature of approx. 200° C in an atmosphere of saturated steam with a pressure of approx. 16 bar. This hydro-thermal hardening process takes several hours. It provokes a silicate re action on the surface of the sand g rains which stimulates the desired hardening process. The transport system is one of the most important components of a sand lime brick making plant. Hardening cars are used for smooth t ransport of the fresh and finished products on a rail system between the individual plant units. Transport to the press as we ll as transport from the brick placing robot and the autoclave feeding system are carried out this way. Finally, the products are tr ansported to the packaging plants.
Details of equipment and Machinery http://dymachine.en.made-in-china.com/product/ubYmRjEcspUs/China-Autoclaved-Steam-Sand-LimeBrick-Machine-Sand-Brick-machine-Plant.html
