In order to design an apparatus for chlorinating titan slag, we must be informed of the following three fundamental data: -the reaction velocity constant (γk
c), the diffusion constant (D
vs) of Cl2 in the ash, and mass transfer coefficient (k
f) of Cl2 in the gas film on the spherically formed sample, composed of coke and slag.
vs< During the chlorination of the titan slag at high temperature, the weight loss of the tabletted cylindrical solid sample, composed of coke and slag, was measured by means of a thermobalance. In these experiments, variables of reaction conditions were found to be temperature, velocity of Cl
2 gas, mixing ratio of coke and slag and diameter of coke particles and slag particles.
From these experimental results, we can calculate the above mentioned three fundamental data (γk
c, D
vs, k
f).
In the first place, dW/dt and W can be known from the weight loss of the sample and the time of reaction t. α and β can be obtained by means of Eq. 7, and Dvs and by means Eqs. 8, 9 and 10.
To know γk
c, k
f should be calculated independently of γk
c. In order to obtain the value of kf, the modified equation for the mass transfer in a single sphere reported by Frosessling (Eq. 19) can be resorted to.
The three fundamental data thus obtained are given in the form of Eqs. 26, 16 and 19. Much useful information for the practical design and operation of an apparatus may be got by their application.
(1) The time required for the complete reaction of a spherically formed sample composed of coke and slag with Cl
2……θ
0 (Eq. 28 and 27).
(2) The capacity of the apparatus.
(3) The utility of Cl
2 in the fixed-bed type appratus.
In this report calculated value of θ
0 is employed.
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