Principle of chlorination-leaching process
A # oxidant in the leaching of antimony sulfide and antimony-containing anode slimes process, it is necessary to consider the oxidation-reduction equilibrium:
(1)
(2)
(3)
(4)
Also consider the hydrolysis equilibrium as shown in formula (5) in the leaching system.
(5)
Based on the oxidation-reduction equilibrium, the leachate return fraction can be determined:
(6)
Wherein δ-A # key component chlorinating agent excess coefficient;
The equivalent content of pentavalent and trivalent europium in β ( 5 ) and β ( 3 ) -chlorinating agents and leachate.
For strontium sulfide ore:
β ( 5 ) =3.3047αs (7)
For anode mud:
β ( 5 ) = (8)
The content of reactable sulfur in the αs-antimony ore;
M i, α i and X i - i species anode slime metals molecular weight, and the content of the oxidation rate;
The valence of low-priced ions of Z i -i metal after oxidation.
(9)
Wherein αj and η j - metal content and leaching rate of high-valent ions; such as Fe, Cu, Sn, As, etc. may be regarded as metals having high valence chloride;
K j - conversion factor, determined by the atomic weight of 锑 and the corresponding metal and the number of electrons absorbed by a molecular chlorinating agent.
(10)
According to the principle that the leaching system does not produce hydrolysis, the total chloride concentration ([Cl - ] TL ) and the limiting acidity ([H + ] L ) calculated by formula (10) can be calculated to maintain the non-hydrolysis of SbCl 3 in the leaching system. Formula for minimum acidity:
(11)
(12)
In the formula, [Sb 3 + ] T is the equilibrium concentration of ruthenium in the leachate, and can be calculated by the formula (13).
(13)
Where R is the liquid to solid ratio.
Finally, the acidity [H + ] s of the leaching process was calculated based on the content of the acid-consuming compound in the bismuth raw material. A # acidity chlorinating agent should be the limit acidity, acidity consumption and insurance acidity sum [H +] p is:
(14)
The key components of the A # chlorinating agent are all determined.
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