Describe the methods for producing aluminates, ferrites and ferrates, as well as their scope

Describe the methods for producing aluminates, ferrites and ferrates, as well as their scope. Write the equations of the corresponding chemical reactions

Aluminates – salts of non-existent metaaluminic acid (HalO2) can be obtained as follows:
1) Alloying aluminum oxide with sodium oxide at 1200 0С:
Al2O3 + Na2O = 2NaAlO2
2) Alloying aluminum oxide with metal hydroxide at 800 0С:
Al (OH) 3 + NaOH = NaAlO2 + 2H2O.
3) Fusion of alumina with carbonate at 1000 0С:
Al2O3 + Na2CO3 = 2NaAlO2 + CO22 ↑
4) Dissolution of aluminum in molten sodium hydroxide at 400 0С:
2Al + 2NaOH + 2H2O = 2NaAlO2 + 3H2 ↑
5) Reactions of aluminum hydroxide with alkalis:
When a weak alkali solution acts on freshly precipitated aluminum hydroxide, sodium tetrahydroxoaluminate is formed:
Al (OH) 3 + NaOH = Na [Al (OH) 4] (sodium tetrahydroxoaluminate);
Under the action of excess alkali on the freshly precipitated aluminum hydroxide, sodium hexahydroxoaluminate is formed.
Al (OH) 3 + 3NaOH = Na3 [Al (OH) 6] (sodium hexahydroxoaluminate).
When heated at about 800 ° C, sodium tetrahydroxoaluminate is dehydrated:
Na [Al (OH) 4] = NaAlO2 + 2H2O

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.