This paper investigates the production of alumina from kaolinite by leaching method using hydrochloric acid. Raw kaolin was calcined at 850?C then leached with 6 M acid 90?C, followed addition HCl solution to leachate aluminum hydroxide precipitated. Finally, precipitated heated 1100?C and turned into oxide. Materials were identified XRF, XRD SEM-EDX techniques. Alumina recovery percentage dete...

The decomposition of dolomite into CaO and MgO was performed at 1073 K in vacuum and at 1273 K in an Ar atmosphere. The dolomite calcined in vacuum was found to have a higher specific surface area and a higher micropore volume when compared to the dolomite calcined in the Ar atmosphere. These pyrolysis products of dolomite were reacted with CO2 at 673 K for 21.6 ks. On the absorption of CO2, th...

In limestone calcined clay cements (LC3), more hemicarboaluminate and monocarboaluminate is observed, as compared to other blended cements, from the reaction of metakaolin with limestone. this study, it shown that formation these carboaluminate phases, predominantly occurs during a “third” hydration peak, after main alite aluminate peaks. The influence content, level sulfate addition water bind...

In this study, the calcined coal gangue was mixed with Al powder at different mass fractions (5wt%〜35wt%). After being pressed 80MPa and sintered 1200°C for 2h, gangue/Al cermet material obtained. The phase composition, microstructure mechanical properties of were studied. results show that main components prepared materials are Al, mullite, AlN, alumina silicon. With increase powder, hardness ...

In the last decades, Aluminum foam has attracted many researchers and manufacturers due to its unique properties which find a lot of applications, especially in lightweight structure. The current work aims study effect adding calcined alumina melting aluminum on final mechanical microstructure produced foam. Calcium carbonate was used as foaming agent. reveals that calcination times/temperature...

In this study, the effect of TiO2 when added to a mixture Nigerian sourced kaolin and calcined alumina powder (50:50) was investigated. The influence Ti4+ ion on physico-mechanical property (apparent porosity, bulk density modulus rupture), phase microstructural evolution studied at sintering temperature 1600?C mullitisation has been maximized based previous reports. sintered samples showed con...

Alumina-supported Cs3[Re(C2O4)3] precursor has been synthesized  for preparation of Re-Cs/g-Al2O3 catalyst. Cs3[Re(C2O4)3]  has been prepared from the reaction of ReCl3 with  H2C2O4.2H2O and CsCl in ...