schminksbro
New member
I found some agricultural lime that has calcium, magnesium oxide, calcium oxide. Is this suitable for kalk? Would the 15% magnesium oxide help keep mag up as well as alk and calcium?
agricultural dolomitic lime
- Thread starter schminksbro
- Start date
That must be a pretty low grade of Dolomite they used to have than little MgO, usually it is way more than that depending on what "grade" of Dolomite it is. However, at least these guys are using the proper term " dolomitic lime" and why it is so low. Dolomitic limestone starts at about 10 % Mg++. Matter of fact, it is almost Limestone. Higher grades are usually more like ~ 40 % Mg ++. With that said I think you are pushing the Mg++ to much much for a Kalk like drip. That is like ~ 15 x the Mg++ of Kalk. But 15 % is about as low as any of it gets so you picked the right one. And then there is the precip issue with the Mg++ jon mentioned. When that stuff hits seawater there will be allot of Mg(OH)2
Is it ......
Dolomitic Quicklime
or
Hydrated Dolomitic lime
With 15 % it almost sounds more like it is neither but Magnesium quicklime, which is between Calcium lime and Dolomitic Lime.
These Lime guys have their own rules which are rather strange.
Quicklime, the product of calcination of limestone, consists of the oxides of calcium and magnesium, and in the United States it is available in three forms:
High calcium quicklime--derived from limestone containing 0 to 5 percent magnesium carbonate.
Magnesian quicklime--derived from limestone containing 5 to 35 percent magnesium carbonate.
Dolomitic quicklime--derived from limestone containing 35 to 46 percent magnesium carbonate.
Hydrated lime is a dry powder manufactured by treating quicklime with sufficient water to satisfy its chemical affinity for water, thereby converting the oxides to hydroxides. Depending upon the type of quicklime used and the hydrating conditions employed, the amount of water in chemical combination varies, as follows:
High calcium hydrated lime--high calcium quicklime produces a hydrated lime containing generally 72 to 74 percent calcium oxide and 23 to 24 percent chemically combined water.
Dolomitic hydrated lime (normal)--under atmospheric hydrating conditions only the calcium oxide fraction of dolomitic quicklime hydrates, producing a hydrated lime of the following chemical composition: 46 to 48 percent calcium oxide, 33 to 34 percent magnesium oxide, and 15 to 17 percent chemically combined water.
Dolomitic hydrated lime (pressure)--this lime is produced from dolomitic quicklime under pressure, which results in hydrating all of the magnesium oxide as well as all of the calcium oxide, producing the following chemical composition: 40 to 42 percent calcium oxide, 29 to 30 percent magnesium oxide, and 25 to 27 percent chemically combined water.
I know all this was not needed
Is it ......
Dolomitic Quicklime
or
Hydrated Dolomitic lime
With 15 % it almost sounds more like it is neither but Magnesium quicklime, which is between Calcium lime and Dolomitic Lime.
These Lime guys have their own rules which are rather strange.
Quicklime, the product of calcination of limestone, consists of the oxides of calcium and magnesium, and in the United States it is available in three forms:
High calcium quicklime--derived from limestone containing 0 to 5 percent magnesium carbonate.
Magnesian quicklime--derived from limestone containing 5 to 35 percent magnesium carbonate.
Dolomitic quicklime--derived from limestone containing 35 to 46 percent magnesium carbonate.
Hydrated lime is a dry powder manufactured by treating quicklime with sufficient water to satisfy its chemical affinity for water, thereby converting the oxides to hydroxides. Depending upon the type of quicklime used and the hydrating conditions employed, the amount of water in chemical combination varies, as follows:
High calcium hydrated lime--high calcium quicklime produces a hydrated lime containing generally 72 to 74 percent calcium oxide and 23 to 24 percent chemically combined water.
Dolomitic hydrated lime (normal)--under atmospheric hydrating conditions only the calcium oxide fraction of dolomitic quicklime hydrates, producing a hydrated lime of the following chemical composition: 46 to 48 percent calcium oxide, 33 to 34 percent magnesium oxide, and 15 to 17 percent chemically combined water.
Dolomitic hydrated lime (pressure)--this lime is produced from dolomitic quicklime under pressure, which results in hydrating all of the magnesium oxide as well as all of the calcium oxide, producing the following chemical composition: 40 to 42 percent calcium oxide, 29 to 30 percent magnesium oxide, and 25 to 27 percent chemically combined water.
I know all this was not needed
Last edited:
