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"The gold and silver is dissolved, and then precipitated in one operation, which we know cannot be done in the 'chlorination process'; besides, the cost of plant and treatment is much less in the above-described process.
At the same time, it provides an example of the way in which general technique developed by the industry was rapidly used to master the new process. In particular their method of lining reaction vessels was of value here. The reaction occurs in two stages by the production of methyl formate and its subsequent chlorination.
The rationale of the process therefore appears to be that the chlorination of the ores is only partially effected during the roasting, so as to prevent the formation of injurious salts, and is completed in the vats, in which the chloride of copper is formed progressively as required, by the gradual grinding away of the copper by friction between the bottom copper plates and the stirrer; and this chloride subsequently becoming incorporated with the boiling brine is considered to quicken the action of the mercury upon the silver.
Their chlorination works, the largest in the world, were putting through 1500 tons per week. The ore as it came from the mine was fed automatically into Krom roller mills, and after being crushed and sifted to regulation gauge was delivered into trucks and conveyed to the roasting furnaces, and thence to cooling floors, from which it was conveyed to the chlorinating shed.
To save the gold in such matrixes as these is an operation which even the best of our mechanical appliances have not yet fully accomplished. Where there is not too great a proportion of base metals on which the solvent will act, and when the material is rich enough in gold to pay for the extra cost of treatment, chlorination or cyanisation are the best modes of extraction yet practically adopted.
So roasted the ores are only partially chlorinized, and their complete chlorination is effected subsequently, during the process of amalgamation; the chlorides are thus formed progressively as required, and, in fact, it would almost appear that the success of the process virtually consists in obviating the formation of injurious salts.
I am of opinion that in cases such as this, where it is not intended to adopt the chlorination or cyanogen process, it will be found most economical to crush to a coarse gauge, concentrate, calcine the concentrates, and finally amalgamate in some suitable amalgamator.
If there was one thing that made me hate Germans worse than anything else, it was those horrid German boots. The boys said they were a hoodoo and that if I continued to wear them Fritz would get me sure. However that may be, I did not cease to have close calls. The very next day I got a small sniff of chlorination gas. It happened while I was fixing communication lines.
The methyl-formate plant was part of an existing installation, but the chlorination and distillation plant were specially installed. Chlorpicrin. This was mixed with diphosgene and used in the familiar Green Cross shell. The production was very readily mastered and attained the rate of 200 tons per month.
PROCESS FACTORI PROCESS FACTORi PROCESS FACTORY Conversion of Kalle Chlorination of Hochst Phenyidithio- Phenyl Mus carbamic acid tard Oil giving to Phenyl Mus- Phenyl Carby tard Oil by lamine Chlo zinc chloride ride Conversion of Lud- Conversion of Lud- Conversion of Lever Ethylene into wigs- Chlorhydrin wigs- Thiodiglycol kusen Ethylene hafen to Thio-di- hafen to Mustard Chlorhydrin glycol Gas
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