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Message: <blockquote data-quote="Amith0424" data-source="post: 30973229" data-attributes="member: 315318"><h2><img class="smilie smilie--emoji" loading="lazy" alt="🔹" title="Small blue diamond    :small_blue_diamond:" src="https://cdn.jsdelivr.net/joypixels/assets/6.6/png/unicode/64/1f539.png" data-shortname=":small_blue_diamond:" /> Step 1: Beneficiation (removing silica, SiO₂)</h2> <ul> <li data-xf-list-type="ul">Acid leaching method: Treat crushed dolomite with dilute HCl or H₂SO₄.<ul> <li data-xf-list-type="ul">Reaction: CaCO3+2HCl→CaCl2+CO2↑+H2OCaCO₃ + 2HCl \rightarrow CaCl₂ + CO₂↑ + H₂OCaCO3+2HCl→CaCl2+CO2↑+H2O MgCO3+2HCl→MgCl2+CO2↑+H2OMgCO₃ + 2HCl \rightarrow MgCl₂ + CO₂↑ + H₂OMgCO3+2HCl→MgCl2+CO2↑+H2O</li> <li data-xf-list-type="ul">Silica (SiO₂) does not dissolve, so it can be filtered out.</li> <li data-xf-list-type="ul">Result: solution of MgCl₂ + CaCl₂.</li> </ul></li> </ul><hr /><h2><img class="smilie smilie--emoji" loading="lazy" alt="🔹" title="Small blue diamond    :small_blue_diamond:" src="https://cdn.jsdelivr.net/joypixels/assets/6.6/png/unicode/64/1f539.png" data-shortname=":small_blue_diamond:" /> Step 2: Separate Ca and Mg</h2> <ul> <li data-xf-list-type="ul">Selective precipitation: Add NaOH or NH₄OH.<ul> <li data-xf-list-type="ul">Mg²⁺ → Mg(OH)₂ (precipitates at higher pH).</li> <li data-xf-list-type="ul">Ca²⁺ precipitates as Ca(OH)₂ only at very high pH, so with careful control, Mg can be separated.</li> </ul></li> <li data-xf-list-type="ul">Another method: Add sodium carbonate (Na₂CO₃) to selectively precipitate CaCO₃ first, leaving Mg²⁺ in solution as MgCl₂.</li> </ul><hr /><h2><img class="smilie smilie--emoji" loading="lazy" alt="🔹" title="Small blue diamond    :small_blue_diamond:" src="https://cdn.jsdelivr.net/joypixels/assets/6.6/png/unicode/64/1f539.png" data-shortname=":small_blue_diamond:" /> Step 3: Produce Magnesium Compound</h2> <ul> <li data-xf-list-type="ul">From the Mg-rich solution, you can get:<ul> <li data-xf-list-type="ul">Mg(OH)₂ (by precipitation with alkali).</li> <li data-xf-list-type="ul">MgO (calcining Mg(OH)₂ at ~1000 °C).</li> <li data-xf-list-type="ul">MgCl₂ (by evaporating solution).</li> </ul></li> </ul><hr /><h2><img class="smilie smilie--emoji" loading="lazy" alt="🔹" title="Small blue diamond    :small_blue_diamond:" src="https://cdn.jsdelivr.net/joypixels/assets/6.6/png/unicode/64/1f539.png" data-shortname=":small_blue_diamond:" /> Step 4: Extract Mg Metal (if you want pure magnesium)</h2>Two main industrial routes:<ol> <li data-xf-list-type="ol">Thermal reduction (Pidgeon process)<ul> <li data-xf-list-type="ul">Start with calcined dolomite (CaO·MgO mixture).</li> <li data-xf-list-type="ul">Mix with ferrosilicon, heat in vacuum ~1200–1250 °C.</li> <li data-xf-list-type="ul">Reaction: 2MgO+2CaO+Si(Fe)→2Mg(g)+Ca2SiO42MgO + 2CaO + Si(Fe) \rightarrow 2Mg(g) + Ca₂SiO₄2MgO+2CaO+Si(Fe)→2Mg(g)+Ca2SiO4</li> <li data-xf-list-type="ul">Magnesium vapor is condensed into solid metal.</li> </ul></li> <li data-xf-list-type="ol">Electrolysis of MgCl₂<ul> <li data-xf-list-type="ul">From solution or molten salt (with added NaCl/KCl to lower melting point).</li> <li data-xf-list-type="ul">Electrolysis gives:<ul> <li data-xf-list-type="ul">Cathode: Mg²⁺ → Mg (metal).</li> <li data-xf-list-type="ul">Anode: Cl⁻ → Cl₂ (gas).</li> </ul></li> </ul></li> </ol><hr /><img class="smilie smilie--emoji" loading="lazy" alt="✅" title="Check mark button    :white_check_mark:" src="https://cdn.jsdelivr.net/joypixels/assets/6.6/png/unicode/64/2705.png" data-shortname=":white_check_mark:" /> Summary:<ul> <li data-xf-list-type="ul">Crush → acid leach → remove SiO₂ → separate Mg²⁺ from Ca²⁺ → make Mg compound (Mg(OH)₂, MgO, or MgCl₂).</li> <li data-xf-list-type="ul">For metal magnesium, use Pidgeon process or electrolysis of MgCl₂.</li> </ul></blockquote>

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