Find the equation related to the desulfurization technology at the high school level Thank you. It s

cao+so2====caso32caso3+o2====2caso4

so2+cao+1/2h2o→caso3·1/2h2o

SO2+CaCO3+1 2H2O CaSO3·1 2H2O+CO2 SO2 is absorbed by droplets; SO2 (gas) + H2O H2SO3 (liquid) The absorbed SO2 reacts with the absorbent of the solution to form calcium sulfite; Ca(OH)2 (liquid) + H2SO3 (liquid) CaSO3 (liquid) + 2H2OCA(OH)2 (solid) + H2SO3 (liquid) CaSO3 (liquid) + 2H2O After the CaSO3 in the droplet reaches saturation, it begins to crystallize and precipitate; CaSO3 (liquid) CaSO3 (solid) CaSO3 in part of the solution reacts with oxygen dissolved in droplets and oxidizes to calcium sulfate; CaSO3 (liquid) +1 2O2 (liquid) CaSO4 (liquid) Caso4 (liquid) has low solubility, resulting in crystallization and precipitation of CaSO4 (liquid) CaSO4 (solid) reaction of CaSO4 (solid) SO2 with the remaining Ca(OH)2 and circulating ash Ca(OH)2 (liquid) Ca(OH)2 (liquid) + H2O H2SO3 (liquid) Ca(OH)2 (liquid) CaSO3 (liquid) + 2H2OCASO3 (liquid) CaSO3 (solid) CaSO3 (liquid) +1 2O2 (liquid) CaSO4 (liquid) Caso4 (solid) CaSO4 (solid) 2NaOH+SO2 Na2SO3+H2O3+H2O 2Naso3Ca(OH)2 + Na2SO3 2 NaOH + CaSO34NaHSO3+2Ca(OH)2 2Na2SO3+2CaSO3·H2O+H2O2Na2SO3+O2 +2Ca( oh)2+4h2o 4naoh+2caso4·2h2o

The sulfur dioxide produced is absorbed by an alkaline substance (calcium oxide).

so2+cao=caso3

Because CaSO3 is unstable and has no value, it is blown into the air, and it occurs: 2CaSO3 + O2 = 2CaSO4 (used to make gypsum).

There are many processes, which are the most commonly used.

1) SO2+H2O H2SO3 absorption.

2) CaCO3+H2SO3 CaSO3+CO2+H2O.

3) CaSO3+1 2O2 CaSO4 oxidation.

4) CaSO3+1 2H2O CaSO31 2H2OCASO4+2H2O CaSO42H2O crystallization.

6) CaSO3+H2SO3 CA(HSO3)2PH control.

Features: Because it is a gas-liquid reaction, its desulfurization reaction speed is fast, high efficiency, high utilization rate of desulfurization additives, such as lime as desulfurizer, when ca s=1, it can reach 90% desulfurization rate, suitable for flue gas desulfurization of large-scale coal-fired power stations.

(1) Calcium carbonate desulfurization!

2) Add calcium carbonate when burning coal!

3)caco3 == cao+ co2

s + o2 == so2

ca+ so2 ==caso3

2caso3 + o2 == 2caso4

Add quicklime.

CAO plus SO2 produces CASO3

This process becomes calcium-based sulphur fixation, which mixes quicklime (CAO) with coal, and S+O2=SO2 in the coal

so2+cao=caso3

2caso3+o2=2caso4

Total reaction formula: 2CaO+2So2+O2=2CaSO4 is further converted into CaSO4, and I think it is because CaSO3 will decompose and produce SO2 once it encounters acidic substances, polluting the environment.

The incompleteness of the upper floor is the addition of quicklime or CAO to the coal, and the sulfur-containing substances in the coal burn S+O2=SO2

Then cao+so2=caso3

Sulfur and copper heating reaction: s+2cu=cu2s

Sulfur is heated with iron to react: S+Fe=Fes

Sulfur reacts with hydrogen s+h2=h2s

Sulfur dioxide reacts with hydrogen sulfide: SO2+2H2S===3S+2H2O

Cothermal reaction of sulfur with NaOH concentrated solution: 3S+6NaOH=2Na2S+Na2SO3+3H2O

Copper and concentrated sulfuric acid coheating: 2H2SO4 (concentrated) + Cu = CuSO4 + 2H2O + SO2

Carbon reaction with concentrated sulfuric acid: 2H2SO4 (concentrated) +C=CO2 + 2H2O + 2SO2

Hydrogen sulfide reaction with concentrated sulfuric acid: H2S + H2SO4 (concentrated) ===S + SO2 + 2H2O

There are three main reactions of industrial sulfuric acid: 4FeS2 + 11O2 ==2Fe2O3 + 8SO2

2so2 + o2 =2 so3 so3 + h2o = h2so4

You just remember that -2 valent sulfur ions are extremely reducible, and they are oxidized to obtain sulfur elements (phenomenon: turbidity) in general reactions (principle: valence conversion. If it encounters a strong oxidizing agent, it may be oxidized to +4 or +6).

The intermediate valence state of sulfur, if oxidized, reacts with valence metals to obtain low-valent metal sulfides, such as cuprous sulfide and ferrous sulfide. When it reacts with sodium hydroxide solution, a disproportionation reaction occurs, which rises and falls.

4 valence is the intermediate valence state, mainly reducible, sulfur dioxide only shows oxidation when it reacts with hydrogen sulfide, and it is a reducing agent in other redox reactions. Generally, it is oxidized to produce sulfuric acid or sulfate.

6 is the most **, only oxidizing, dilute sulfuric acid reacts with metal to produce hydrogen, concentrated sulfuric acid has strong oxidation, and reacts to generate sulfur dioxide.

1）so2+h2o→h2so3

Absorb. 2) CaCO3+H2SO3 CaSO3+CO2+H2O.

3）caso3+1/2o2→caso4

Oxidation. 4) CaSO3+1 2H2O CaSO31 2H2OCASO4+2H2O CaSO42H2O crystallization.

6) CaSO3+H2SO3 Ca(HSO3)2PH control mega disturbance bureau.

Features: Because it is a gas-liquid reaction, its desulfurization reaction speed is fast, high efficiency, dehydration makes the utilization rate of sulfur additives high, such as lime as a desulfurizer, when Ca S=1, it can reach 90% desulfurization rate, suitable for flue gas desulfurization of large-scale coal-fired power stations.

SO2 (gas) + H2O H2SO3 (liquid).

The absorbed SO2 reacts with the absorbent of the solution to form calcium sulfite; It's good.

Ca(OH)2 (liquid) + H2SO3 (liquid) CaSO3 (liquid) + 2H2O

Ca(OH)2 (solid) + H2SO3 (liquid) CaSO3 (liquid) + 2H2O

After the caSO3 in the droplets reaches the saturation of filial piety, the wild beginning of the opening is precipitated.

CaSO3 (liquid) CaSO3 (solid).

CaSO3 in part of the solution reacts with oxygen dissolved in droplets and oxidizes to calcium sulfate;

CaSO3 (liquid) + 1 2O2 (liquid) CaSO4 (liquid).

CaSO4 (liquid) has low solubility and thus crystallization and precipitation.

CaSO4 (liquid) CaSO4 (solid).

Reaction of SO2 with the remaining Ca(OH)2 and circulating ash.

Ca(OH)2 (solid) Ca(OH)2 (liquid).

SO2 (gas) + H2O H2SO3 (liquid).

Ca(OH)2 (liquid) + H2SO3 (liquid) CaSO3 (liquid) + 2H2O

CaSO3 (liquid) CaSO3 (solid).

CaSO3 (liquid) + 1 2O2 (liquid) CaSO4 (liquid).

CaSO4 (liquid) CaSO4 (solid) 2NaOH + SO2 Na2SO3 + H2O

na2so3+so2+h2o→2nahso3

ca(oh)2 + na2so3 → 2 naoh + caso3

4nahso3+2ca(oh)2→2na2so3+2caso3·h2o+h2o

2na2so3+o2 +2ca(oh)2+4h2o→4naoh+2caso4·2h2o