﻿LEAD PROM PERCHLOR/VTE BATHS 



37 



Experiment 1. Composition cf the batli : 4.5 per cent HCIO^, 

 5.4 per ceat lead, and 0.05 per cent peptone. The distance between 

 anode and cathode was 2.2 em. Volume of the solution was 

 400 cc. 



Anode. Cathode. Volts- 



3.2 1.6 0.21 



4.0 2.0 0.27 



5.G 2.8 0.38 



8.0 4.0 0.55 



Experiment 2. Comiposition of bath : 6.1 per cent HCIO^, 7.13 

 per cent lead, and 0.05 per cent peptone. The distance between 

 anode and cathode was 4 cm. Volume of ssolution was 800 cc. 



Amperes Per Sq. Dm. 



Anode. Cathode. Volts. 



1.0 0.21 0.08 



2.2 0.45 0.15 



2.6 0.55 0.18 



3.S 0.8 0.25 



4.2 0.9 0.26 



5.0 1.6 0.30 



6.2 2. 0.34 



The results were the same with new anodes or with anodes that 

 were covered lightly with slime containing enough mercury to give 

 a bright color. 



Purification Results. The purity of the deposited lead which is 

 obtained by the electrolysis of this bath is shown by the accompany- 

 ing analyses of the different products. 



Experiment (1) 

 Slime _ 



Cu 

 Per Cent. 



Sb 

 Per Cent. 



Pb 

 Per Cent. 



As 

 Per Cent. 



Per\fent. 



Bi 

 Per Cent. 



1.89 

 0.18 

 0.005 



83.9 

 0.45 

 0.0007 



37.56 

 1.5 

 0.004 



6.49 





6.29 

 1 48 

 0.003 



30.83 

 0.87 

 0.004 



Bullion 



0.24 

 none 



Refined Metal 



EXPERIMEXT (2) 



Slime 



99.984 

 4.05 



Bullion _ _ „ 











Refined Metal 













Experiment (3) 

 Slime 





1.1 





91.0 

 1.84 

 none 





Bullion 









Refined Metal 

























In these experiments, the copper, antimony, silver, arsenic and 

 bismuth were added to the bullion in order to obtain a low-grade 



