FeCr2O4→ INa2CrO4→ IICr2O3→ IIICr

4FeCr2O4+8Na2CO3+7O2→ Heat8Na2CrO4+2Fe2O3+8CO2Na2CrO4+2NH4Cl→(NH4)2Cr2O7+2NaCl→ HeatCr2O3→ AlCr

FeCr2O4→ INa2CrO4→ IICr2O3→ IIICr

4FeCr2O4+8Na2CO3+7O2→ Heat8Na2CrO4+2Fe2O3+8CO2Na2CrO4+2NH4Cl→(NH4)2Cr2O7+2NaCl→ HeatCr2O3→ AlCr

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$F e C r_{2} O_{4} \to_{}^{I} N a_{2} C r O_{4} \to_{}^{I I} C r_{2} O_{3} \to_{}^{I I I} C r$

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$I - N a_{2} C O_{3} / a i r; II - N H_{4} C l; III - A l$

$I - N a O H / a i r; II - A l; III - N H_{4} C l$

$I - N a_{2} C O_{3} / a i r; II - A l; III - N H_{4} C l$

$I - A l; II - N H_{4} C l; III - N a O H / a i r$

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$4 F e C r_{2} O_{4} + 8 N a_{2} C O_{3} + 7 O_{2} \to_{}^{H e a t} 8 N a_{2} C r O_{4} + 2 F e_{2} O_{3} + 8 C O_{2}$

$N a_{2} C r O_{4} + 2 N H_{4} C l \to {(N H_{4})}_{2} C r_{2} O_{7} + 2 N a C l \to_{}^{H e a t} C r_{2} O_{3} \to_{}^{A l} C r$

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FeCr2O4→ INa2CrO4→ IICr2O3→ IIICr

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$F e C r_{2} O_{4} \to_{}^{I} N a_{2} C r O_{4} \to_{}^{I I} C r_{2} O_{3} \to_{}^{I I I} C r$