The characteristics and the mechanisms of flotation of Oxide or silicate minerals, slightly soluble alkaline earth minerals, soluble compounds as alkali halides, and sulfide minerals by amine type collectors are described.
The studies on the amine collection of those minerals are substantial in the oxide and silicate minerals flog tion.
Above all, the influence of electro-chemical phenomena of mineral-water interface must be taken into consideration on the studies of oxide or silicate minerals and the several e lkaline earth and sulfide minerals flotation.
In addition, the other mechanisms of collection have been mentioned, that is, the adsorption of collector on the feldspar activated by using HF the exchange adsorption of collector ion and barium ion on the surface of barite, the selectivity based on the ionic size of alkali ion and collector ion or the heat of solution of alkali halide, and so on.

View full abstract

From seventeen centuries, the copper dissolving in acid mine drainage was recovered as the copper precipitated.
It was thought that the copper in an ore was leached by the action of ferric sulfate and sulfate which produced from iron and sulfur in a sulfide minerals by the natural oxidation.
It was recently proved that the bacteria in concerning with these phenomena was discovered and many kind of metals was leached by the simple chemical method and directly or indirectly in addition to bacterial action.
This fact was suggested that there exist a possibility to be capable of recovery the metals by the action of these bacteria from the low grade ore or the waste dump.
And then the research in this division was prosperous in many countries.
In this paper, the outline of bacterial leaching was described and the problems to be solved was pointed out at the situation of microbiology and mineralogy.

View full abstract

Water content, overflowing fluidity and weight of entrained gangue particles in froths containing gangue were investigated, using MIBC, Yarmour F Pine oil, Dow Froth 250 as frothers in 500g Kyodaitype flotation test machine. Dry-grouned quartz and marble were used as gangue in the quantity of 100g/2.1-2.2l of solution. In the overflowed and sucked-in froths formed by use of Dow Froth 250 seemed to contain the least weight of entrained marble or quartz particles among the use of the three frothers. At the same time, the froth of the Dow Froth 250 showed the highest froth layer, and overflowing fluidity of this froth was the least. Explanation seems urgently needed to elucidate the relation between froth stability and the entrained gangue weight.

View full abstract

Uchinotai mill, which was constructed in july 1962, is now treating 38000t crude ore (black ore) per month and producing Cu, Pb, Zn, Sp and BaSO4 concentrates. This paper describes the present state of the mill and recent improvements i. e.
1) new trial of Cu-Pb separation by hot water
2) recovery of BaSO₄ concentrate by flotation

View full abstract

To deal with the increase of tonnage by the development of the somen deposit, we have installed the swirl-cyclone 450. Sep.1968. and have had the drastic instrumentation for the purpose of effectuation of heavy media separation by the swirl-cyclone and the operation cost down.
In this connection a brief discussion of factors affecting to the operation performance and the general description of instrumentation at our plant is maede.
By the adaption of T-T alloy, controll of media size, reinforce of de-slime in circulating suspensoid and specific gravity controll of suspensoid by the B-B densimeter,
Since oct. 1967. the operation is stabilized and float tonnage increased 1775-1960 t/m in comparision with the Cone Separater.
In recent, separation sharpness of the swirl-cyclone (Ep) is 0.075, (I) is 0.0166.

View full abstract