Show TYPES OF FLOTATION REAGENTS the reagents employed in flotation work are of two types one being known at flotation controlling agents and the other as flotation agents states the bureau of mines department of commerce in serial 2700 just issued flotation lo tation controlling agents are those substances or chemicals of the inorganic class that are added to the ground ore water pulp to add vigor to the of a particular mineral or to decrease the y of a particular mineral IF flotation lo tation agents are those substances invariably of organic nature that cover the mineral particles with a film that permits them to be caught by the bubbles injected into the pulp another property of such substances is to lower the surface tension of the water thus permitting the formation of small bubbles and a froth generally speaking the controlling agents should be bd and are added to the pulp at some point in the mill prior to the addition of the oils sometimes chemicals such as lime are added to the ore as it is dumped into the tha mill feed bins but as a rule the controlling a agents ants are added to the fine grinding ball mills the oils if they are heavy and nd difficult to incorporate may be added with the controlling agents to the same grinding orrin ding mill this would not seem to be good practice but it is often done again in many plants the reagents b are mixed with the ore pulp in separate agitators 6 the time of reaction required for controlling agents to impart the desired change in surface properties to the respective spec tive minerals present depends upon the ore being treated and the controlling agent found suitable for its treatment with most reagents rea 6 ants and most products a conditioning tio ning I 1 period of one to five minutes b generally is sufficient in the treatment of a collective float concentrate of two minerals A and B to be separated into A and B concentrates where say A is to be floated and B is to be suppressed a conditioning period of several minutes to a half hour may inay be necessary where sodium or potassium is the reagent it is fed direct into the first cell of the flotation machine a and n d a conditioning period of any consequence does not seem to be required |