Silica contains ferric oxide, how to remove it

1. Add dilute hydrochloric acid and then filter.

Fe2O3 + 6HCl == 2FeCl3 + 3H2O2, can not be heated, otherwise carbon will reduce copper oxide to copper. Pure oxygen should be continuously introduced to reheat C + O2 = = CO2

Even if carbon reacts with Cuo to become Cu, oxygen can re-oxidize Cu.

3. Manganese dioxide is insoluble in water, and impurities can be removed by dissolution-filtration-crystallization, and there is no equation for this.

4. The steps are similar to 3, first dissolve in water to remove manganese dioxide, and then use potassium nitrate, whose solubility is much greater than sodium chloride affected by temperature, and crystallize potassium nitrate by cooling the hot saturated solution. There are no equations either.

5. Sodium hydroxide solution and concentrated sulfuric acid are introduced in turn.

NaOH + HCl == NaCl + H2OH2SO4 (concentrated) + NH2O == H2SO4·NH2O (N=1 4).

6. First pass into the saturated sodium bicarbonate solution and then into the concentrated sulfuric acid.

NaHCO3 + HCl == NaCl + H2O + CO2 concentrated sulfuric acid as above.

ps.The two equations for concentrated sulfuric acid are generally not required to be mastered.

1.Hydrochloric acid is added to the mixture, Fe2O3 + 6HCl = 2FeCl3 + 3H2O, SiO2 is insoluble in hydrochloric acid.

2.Burning mixture, C+O2=CO2

3.The mixture is dissolved in water, filtered, MNO2 is insoluble in water, on filter paper, KCl is dissolved in water, in the filtrate.

4.The mixture is dissolved in water, filtered, Mno2 is insoluble in water, on the filter paper, NaCl and Kno3 are dissolved in water, in the filtrate, and then Kno3 is precipitated by cooling the hot saturated solution method, and NaCl is left in the solution.

5.Through the drying tube of soda lime (NaOH and CAO), NaOH+HCl=NaCl+H2O, CAO+H2O=Ca(OH)2

6.First, through the saturated NaHCO3 solution, NaHCO3+HCl=NaCl+H2O+CO2, CO2 does not react with the saturated NaHCO3 solution, and then through the drying tube of CaCl2.

1. Fe2O3+6HCl==2FeCl3+3H2O, SiO2 is insoluble in dilute hydrochloric acid.

2. Heating, C+O2==CO2

3. Dissolve the solid in water and filter, and MNO2 is insoluble in water.

4. Add water to dissolve and filter to remove MNO2, and then separate potassium nitrate and sodium chloride by cooling hot saturated solution.

5. HCl+Naoh==NaCl+H2O, and then remove the gas through concentrated sulfuric acid to remove water.

6. The gas is passed into the saturated NaHCO3 solution, CO2 will not be dissolved in the saturated NaHCO3 solution, there is HCl+NaHCO3==NaCl+H2O+CO2, and then the gas is removed through concentrated sulfuric acid.

1. With water, the first one is not allowed, and the second is dissolved. 2. Heat.

Also write equations.

Forget it, you're too lazy.

chemical methods such as sandpaper grinding, hydrochloric acid; Ferric oxide is a basic oxide, and such impurity stains can be washed with hydrochloric acid or oxalic acid; By putting carbon in a mixture of iron and ferric tetroxide, and heating the mixture of iron and ferric tetroxide at high temperatures, ferric tetroxide will break down into iron and carbon dioxide, so that ferric tetroxide can be removed. Ferric oxide, chemical formula Fe O. Commonly known as iron oxide black, magnet, magnet, black iron, is a magnetic black crystal, so it is also called magnetic iron oxide.

It cannot be read as"Ferrous metaferrate"or"Ferric metaferrite [Fe(FeO2)2].", not a mixture of iron oxide and ferrous oxide, but can be approximated as a compound of ferrous oxide and iron oxide. This substance is soluble in acid solution, insoluble in water, alkali solution and organic solvents such as ethanol and ether. Mainly although it is soluble in acid, but even if it is a strong acid, the dissolution speed is not fast, its structure is relatively tight, chloride ions in hydrochloric acid will be complexed with iron ions, concentrated oxalic acid can reduce ferric iron in ferric oxide to more soluble ferrous ions, both can speed up the decontamination speed, but also where it needs to be decontaminated, if it is on metal appliances, hydrochloric acid should not be used, it will corrode the metal surface, the above carefully arranged answers hope to help you.

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<> Hello dear and good afternoon. I'm glad to answer for you. chemical methods such as sandpaper grinding, hydrochloric acid; Ferric oxide is a basic oxide, and such impurity stains can be washed with hydrochloric acid or oxalic acid; By putting carbon in a mixture of iron and ferric tetroxide, and heating the mixture of iron and ferric tetroxide at high temperatures, ferric tetroxide will break down into iron and carbon dioxide, so that ferric tetroxide can be removed.

Ferric oxide, chemical formula Fe O. Commonly known as iron oxide black, magnet, magnet, black iron, is a magnetic black crystal, so it is also called magnetic iron oxide. It cannot be read as"Ferrous metaferrate"or"Ferric metaferrite [Fe(FeO2)2].", not a mixture of iron oxide and ferrous oxide, but can be approximated as a compound of ferrous oxide and iron oxide.

This substance is soluble in acid solution, insoluble in water, alkali solution and organic solvents such as ethanol and ether. Mainly although it is soluble in acid, but even if it is a strong acid, the dissolution speed is not fast, its structure is relatively tight, chloride ions in hydrochloric acid will be complexed with iron ions, concentrated oxalic acid can reduce ferric iron in ferric oxide to more soluble ferrous ions, both can speed up the decontamination speed, but also where it needs to be decontaminated, if it is on metal appliances, hydrochloric acid should not be used, it will corrode the metal surface, the above carefully arranged answers hope to help you.

I hope my answer is helpful to you, and please give a thumbs up (comment in the lower left corner), looking forward to your like, your efforts are very important to me, and your support is also the motivation for my progress. Finally, I wish you good health and a good mood! ~<

Summary. Utilization of alumina is a property of amphoteric oxides. Alumina can react with sodium hydroxide while iron oxide cannot

Al2O3 + 2NaOH ==2Naalo2 (sodium metaaluminate) + H2O method is to add excess sodium hydroxide to the mixed solid, so that the alumina reaction dissolves, and then filters, and the solid obtained after filtration is only iron oxide.

Utilization of alumina is a property of amphoteric oxides. Alumina can react with sodium hydroxide but iron oxide cannot: Al2O3 + 2NaOH ==2Naalo2 (sodium metaaluminate) + H2O The method is to add excess sodium hydroxide to the mixed solid, so that the alumina reaction is dissolved, and then filtered, and the solid obtained after filtration is only iron oxide.

I hope it can give you a reference.

If you dispose of the metal on the surface of the oxide lu.

If you dispose of the metal on the surface of the oxide lu.

Metal on the surface of aluminum oxide? What metal.

Hello, happy to answer your questions.

Excessive sodium hydroxide solution is added to the mixed solid, the alumina is dissolved by reaction, and then filtered, filtered and dried to obtain only iron oxide.

Utilization of alumina is a property of amphoteric oxides. Alumina can react with sodium hydroxide but iron oxide cannot, and the reaction equation is:

al o +2naoh ==2naalo +h o Hello, happy to answer your questions. Excessive sodium hydroxide solution is added to the mixed solid, the alumina is dissolved by reaction, and then filtered, filtered and dried to obtain only iron oxide. Utilization of alumina is a property of amphoteric oxides.

Alumina can react with sodium hydroxide but iron oxide cannot, the reaction equation is: al o +2naoh ==2naalo +h o, I hope it can help you.

Sodium hydroxide can be added to filter to remove silica. Because silica is an acidic oxide, SiO2+2NaOH=Na2SiO3+H2O, while ferric oxide does not have such a reaction and does not interact with sodium hydroxide, so as to achieve the purpose of separation.

1. Silica is chemically stable. It is insoluble in water and does not react with water. It is an acidic oxide and does not react with ordinary acids.

After adding acid, filter to obtain a solid silica, the solution is an iron acid, and the filtrate is evaporated and decomposed to obtain ferric oxide.

Advantages can react with lumpy mixtures Disadvantages, burning may produce ferric tetroxide.

2 Hydrofluoric acid is the only acid that can dissolve silica SiO2 4HF = SIF4 2H2O

But I don't know if it and ferric oxide reflect that, if so, the filtered solid is ferric oxide.

3. Silica reacts with a hot strong alkali solution or molten alkali to form silicate and water.

sio2 ＋ 2naoh = na2sio3 ＋ h2o

2 3 Advantages and easy operation Disadvantage 2 3 The two methods can only be reflected with powdered objects, otherwise it will lead to incomplete impurity removal.

Filter after adding nitric acid.

The solution is ferric nitrate, and the filtrate is evaporated and then burned to decompose ferric nitrate to obtain ferric oxide.

Utilization of alumina is a property of amphoteric oxides. Alumina can react with sodium hydroxide but iron oxide cannot: Al2O3 + 2NaOH ==2Naalo2 (sodium metaaluminate) + H2O The method is to add excess sodium hydroxide to the mixed solid, so that the alumina reaction is dissolved, and then filtered, and the solid obtained after filtration is only iron oxide.

Sodium hydroxide is used, because aluminum oxide is an amphoteric oxide, which can be melted into strong bases.

It depends on what the product is.

The general industrial method is to dissolve the product in an organic solvent and then filter it with filter paper.

Add sodium hydroxide and filter.