Large reserves of feldspar ore deposits are found in the alkali granite rocks at Al-Madinah province, Saudi Arabia. Magnetic separation and flotation tests were used in order to achieve the aims of this study which are: reduce the iron and titanium contents of Medina feldspar ore, which impart color and decrease the feldspar quality, as well as produce a high-quality feldspar concentrate, which meets the commercial grade of the raw material specifications for the ceramics and glass industry. The obtained results from this study showed that the efficient separation of Fe-and Ti-bearing minerals could be achieved by a combination of the dry high-intensity magnetic separator at 14.000 gauss and the direct cationic flotations under 500 g/ton dosage of Aero 801 + Aero 825 + Aero 830 mixture in an acidic medium at pH 3. The feldspar concentrate was produced with 65.18 wt.% SiO 2 , 19.02 wt.% Al 2 O 3 , 0.06 wt.% Fe 2 O 3 , 0.09 wt.% TiO 2 9.09 wt.% K 2 O and 6.01 wt.% Na 2 O grades, which meet the commercial scale of feldspar.

In the present study, the effect of cementing properties of oil shale ash on the compressive strength of the concrete mixtures produced from oil shale ash, cement, sand, and water was investigated. The used shale ash was produced by direct combustion at 830°C in a laboratory muffle furnace of the El-Lajjun oil shale. Based on the chemical composition of shale ash (OSA), it was concluded that this material consists of a high percentage of CaO which forms the properties of cement materials as well as the contents of SiO 2 , Al 2 O 3 , and Fe 2 O 3 form the properties of pozzolanic materials. Oil shale ash (OSA) materials have diverse applications as alternative materials for the construction industry and construction technology to reduce environmental risks and achieve sustainability. The results showed that the pressed specimen with 40 wt.% OSA content, 50 wt.% sand content and 30% MW obtained the highest compressive strength of about 9.1 MPa after 28 days of hardening. The highest value of 28 days compressive strength for a compacted specimen containing 35 wt.% OSA and 35% MW were achieved with 12 MPa at a compaction pressure of between 25 and 30 MPa. High compressive strength values were found to be achieved in the compressed specimens by controlling mixing water. It is also indicated that the compressive strength increases as OSA content in the compressed specimen increases and increases as compaction pressure increases.

The objective of this study was to reduce the contents of iron and titanium heavy minerals of feldspar from Medina syenite ore by a combination of magnetic separation and flotation to obtain the commercial scale of feldspar concentrate for glass and ceramics industries. For the first time, a process flowchart was provided in the light of this study to produce a high-quality K-feldspar product from syenite ore, which meets the requirements of feldspar for glass and ceramics productions. The results reflect that the best performance separation of iron and titanium contents was produced by a dry magnetic separator at 16.000 gauss. The produced feldspar concentrate by magnetic separation yielding 0.54% Fe2O3 with 87% Fe2O3 recovery and 0.57% TiO2 with 16% recovery. The flotation tests were performed on the non-magnetic fraction of the syenite ore. In this stage, the most effective for removal of Fe2O3 and TiO2 from syenite ore was obtained at a 300 g/ton dosage of a mixture of Aeromine 3030C and Aeromine 801 + Aeromine 825 as a collector in an acidic medium (pH 3). The final feldspar concentrate with 0.07% Fe2O3 and 0.06%TiO2 grades was obtained with 89% Fe2O3 recovery and 86% TiO2 recovery. The commercial scale of feldspar concentrate from syenite ore can meet the desired specification of grades 1 and 2 for glass, porcelain, and ceramics industries.

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