Make MgO By Ring Carbonization
Process for preparing magnesium oxide by ring
carbonization
Magnesium oxide is an inorganic chemical
product widely used in the construction of the national economy. It is widely
used in the production of rubber, paper, ceramics, medicine and refractory
materials. my country is one of the main producers of magnesium oxide in the
world, but most companies still follow the extensive production model, which
not only causes a waste of magnesium resources, but also damages the ecological
environment. In this paper, the cyclic carbonization process in the magnesia
carbonization process is researched and improved, and the cyclic carbonization
process and the mechanical agitation carbonization process are compared. The
following results have been achieved during the research process:
(1) The mass
transfer process and kinetics of the cyclic carbonization process were studied,
and the influence of factors such as gas flow rate, gas distribution ratio,
particle size and other factors on the cyclic carbonization process was
investigated. The optimal production conditions of the cyclic carbonization
process are: 14g/L The solid-liquid ratio, the particle size of the ore powder
is 120 mesh, the flow rate of the mixed gas of carbon dioxide and impurity gas
is 1.08L/min and 4.4L/min, that is, the carbon dioxide content in the mixed gas
is higher than 20%, and the carbonization time is about 40min.
(2) The mass transfer and reaction kinetics
model of the cyclic carbonization process is theoretically established, and the
model formula is: 1-2?/3-(1-?)2/3=k't.
(3) Calculation
and deduction and test results show that the apparent activation energy is
18.6kJ/mol in the temperature range of 10~25?, and the cyclic carbonization process is a diffusion
mass transfer control step; while in the temperature range of 25~35?, The apparent activation energy is
33.15kJ/mol, and the cyclic carbonization process is a mixed control step of
mass transfer diffusion and surface chemical reaction.
(4) The cyclic carbonization process uses
impurity-containing magnesium resource ore and industrial waste slag as raw
materials, and uses active calcination to effectively separate the impurities
in the raw materials. And for the separated calcium-containing waste residue, a
recovery plan using ammonium carbonate and ammonia precipitation method is
proposed, which effectively improves the utilization rate of resources.