Calculation of effective calcium oxide in mechanical sintering o

1. Experimental steps and calculation formula: 1. Weigh a certain mass of lime powder, such as a gram,
2. Add water (let all calcium oxide be converted into calcium hydroxide),
3. Dry (the temperature should not be too high to prevent reaction with carbon dioxide and put it in a small container for drying),
4. Weigh again, B gram
calculation formula:
Cao mass: (B-A) multiplied by 56 / 18,
Ca (OH) 2 mass: (B-A) multiplied by 74 / 18
finally, remind again: the drying temperature is 50 or 60 degrees, and put it in a small container for drying (test tube).

2. The method of chemical titration
this method is often seen in the Chemistry Manual

3. Effective
Cao
= total percentage of Cao sintering
basicity
*
silica
total percentage. In other words, in order to achieve the target alkalinity, after decting the calcium oxide needed to offset the silica in
quicklime
the remaining calcium oxide is
effective calcium oxide
. For example, the test results of quicklime show that CaO content is 80,
SiO2
content is 3, and sinter basicity is 2.0. In order to neutralize SiO2 with 2.0 basicity, Cao = 2.0 * 3 = 6 is needed, then effective Cao = 80-6 = 74

4. Atomic weight of calcium 40, Cao (40 + 16)
68% / (40 / 56) = 95.2%

5. Grind the sample into powder, then burn it at high temperature to change CaCO3 into Cao, rece the mass to CO2, calculate the mass of CaCO3, and finally subtract the mass of CaCO3 from the initial mass of the sample, which is the mass of Cao.

6. The calculation of ore sintering grade is generally based on the grade of 100 parts by weight except water before sintering. After sintering, other components also change except water evaporation. The volatile matter is lost and the weight of the original 100 parts is reced. Because the material referred to by grade does not volatilize in sintering, the total grade will not be lost. The calculation method can use the original grade as the divisor, If 100 kg iron ore powder contains 50% iron before sintering and only 80 kg iron after sintering, the iron content after sintering is 50 / 80 = = 0.625, i.e. 62.5%

7. There may be something wrong with the data you provided. Please check. I have a cold for what you said. If the magnesium content is 28%, the magnesium oxide content should be about 47%. In addition, brucite is the most abundant natural resource in nature. Magnesium content is about 66% based on magnesium oxide. In natural ore, it is unheard of that the content of calcium oxide is about 20%, while the content of magnesium oxide is still so much. You'd better take a look at the test results first
lime is an air hardening inorganic cementitious material with calcium oxide as the main component. Lime is calcined from limestone, dolomite, chalk, shell and other procts with high content of calcium carbonate at 900-1100 ℃. Lime is the earliest cementitious material used by human beings. Lime is widely used in civil engineering, and it can also be used in medicine in China. For this reason, the ancient spread of lime as the theme of poetry, eternal chant.

8. Effective Cao = total Cao percentage sinter basicity * total SiO2 percentage. In other words, in order to achieve the target alkalinity, after decting the calcium oxide needed to offset the silicon dioxide in quicklime, the remaining calcium oxide is the effective calcium oxide. For example: quicklime test results, CaO content 80, SiO2 content 3, sinter basicity 2.0. In order to neutralize SiO2 with 2.0 basicity, Cao = 2.0 * 3 = 6 is needed, then effective Cao = 80-6 = 74