Flotation test

The levels of collector were examined in several series of flotation tests. These results from the tests using different levels of collector is shown in Table 23.7. 

The newly developed modified alkyl hydroxamate reagents (from Cytec Industries) tested in this study include S-8704, S-8704D, S-8705, S-8706, S-8706D and S-8765, while the reference collectors used were Aero Promoter 6493 (also from Cytec) and tall oil. The crude clays were dispersed using sodium silicate while soda ash was used to adjust the pH. The frother used in the flotation tests was Aerofroth 70. 

Table 1 Denver cell flotation testing of sample A soft kaolin with good flotation response)...

Table 5 Column flotation testing of sample A using S-8706D and S-8706...

Penetration of particles into fluid Flotation tests Penetration time Sediment height Critical solid surface energy distribution References R. Ayala, Ph.D. thesis. Chemical Engineering, Carnegie Mellon University, 1985. Fuerstaneau et al. Colloids and Surfaces, 60, 127 (1991). Vargha-Butler et al., in Interfacial Phenomena in Coal Technology, Botsaris Glazman (eds.). Chap. 2, 1989. 

The ability of plastics to float on the surface of a beaker of tap water at 20°C is related to their density at that temperature. The density of water at 20°C is approximately 1 g cm-3. If a small sample floats on the surface of the water, it has a density lower or equal to one at the same temperature if it sinks, it has a density greater than one. Polyethylene, polypropylene and polystyrene float on water while other plastics sink, Bakelite and casein having the highest densities. The flotation test is a rough method to identify plastics since results are dependent on the physical form of the plastic. Foams contain cells filled with air, so their densities will be lower than a solid block of the same type of plastic. 

The flotation test is a rough method to identify plastics since results are dependent on the physical form of the material. Foams contain cells filled with air, so their densities will be lower than a solid block of identical dimensions of the same type of plastic. Water-sensitive or absorbent fillers such as paper... 

The ISP consumes virtually all the world s production of bulk concentrates, materials that usually contain 45-60% of zinc plus lead and with at least 10% of each metal. The ability of the ISP to accept bulk concentrates was a major factor in determining the viability of the McArthur River mine in Australia. Tests over many years had been unable to determine a method of separating the zinc and lead in the ore with accqrtable recoveries. However, much better recoveries could be obtained if a bulk concentrate was produced. Table II shows the results of flotation tests to produce selective and bulk concentrates, as given in the paper by Lee etal.(3). 

Caps or Coverings not permitted during Flotation Test... 

NON-COMPUANT Exampies of Additional Flotation to Pass the Flotation Test Figure 4.2 Two Figures from the 2013 Official Rule book... 

A sample of high grade phosphate rock (apatite) was obtained from Agrico Chemical Co. and dolomite sample was procured from IMC Fertilizers, Inc. Flotation tests employed 60 X1CX) mesh fraction of the sample and electrokinetic and FT-IR studies were conducted on -325 mesh fraction of the ground sample. 

Single mineral apatite and dolomite flotation tests using dodecylamine hydrochloride as the collector indicated that apatite can be recovered from its mixture with dolomite at pH less than 4.5 at a collector concentration of 1 m mol/m, and at pH 9.8 at 0.16 m mol/m . However, the magnitude of selectivity predicted by the single mineral test was not realized when attempts were made to float a 50 50 mixture of apatite and dolomite. 

Single Mineral Flotation Tests. Experiments conducted in the natural pH range (pH 6.7) as shown in Table I, yielded 88% flotation recovery of apatite at a dodecylamine concentration of 1.6 X 10" kmol/m . Apatite recovery in the absence of NaCI was observed to be 49%. In contrast, dolomite recovery under similar experimental conditions with and without NaCI remained at the 18-19% level. 

Mixed Mineral Flotation Tests. Flotation of 88 12 apatite-dolomite mixtures was conducted to verify the selectivity predicted on the basis of single mineral experiments. Results presented in Table II demonstrate that at dodecylamine concentration of 1.6 X10" kmol/m apatite can be selectively recovered from the mixture leaving dolomite In the sink fraction. 

A sequence of ATR spectra for a chalcocite (CU2S) electrode in the presence of 10 " M KEX at increasing potentials is shown in Fig. 1.31a [514]. The spectra observed from —0.25 V were attributed to Cu(I)EX (Fig. 7.23). The potential dependence of the VasCOC band, the flotation recovery, and the current are shown in Fig. 1.34b. After correcting for the difference in the EX concentration in the flotation test (a concentration of 1.9 x 10 M implies a cathodic shift of the flotation curve by 0.043 V), the onset of the flotation is seen to coincide with the appearance of the IR signal and the first two peaks in the voltammogram. Thus the spectra suggest that the maximum flotation may be a result of the formation of multilayers of Cu(I)EX, and the current peaks can be attributed to different mechanisms of copper xanthate formation. However, a closer inspection of the spectra shown in Fig. 1.31a reveals a number of differences from the spectrum of bulk Cu(I)EX, which were ignored by the authors. At potentials below -1-0.05 V,... 

Flotation testing showed that the collecting capability of phenyl thioacetamide is not very good [6]. Flotation results of galena using phenyl thioacetamide, diphenylguanidine, and sodium diethyldithiocarbamate are shown in Fig. 1.4. 

Fatty acids and soaps are widely applied in the flotation of oxidized ores. In general, fatty acids are comprised of saturated and unsaturated carboxylic acids with Cjo- 20- The components of various fatty acids are listed in Table 2.1 [1]. Fatty acid collectors are usually insoluble in water. The solubilities of various fatty acid collectors are found in Table 2.2. Fatty acid soaps are prone to form micelle with the increase in its concentration. The CMC, CDC, and HMC had been discussed in Chap. 1. Based on the flotation testing of calcite, it can be obtained that CDC CMC. It can be obtained that HMC 1/lOOCAfC according to the flotation testing of quartz with fatty amine. The CMC of various fady acid soaps is found in Table 2.3. 

The collecting capabilities of oxidized paraffin soaps are worse than those of oleic acids when the pulp temperature is less than 40 °C. According to the flotation tests, the collecting capabilities of oxidized paraffin soaps become better than those of oleic acids when the pulp temperature approaches 70 °C. Therefore, the solubilities of oxidized paraffin soaps are improved by adopting emulsifier or other additives when reagents are used at the normal temperature level. 

The flotation experiments, which have been analysed, were all carried out using Denver flotation equipment. The cell has approximately Idm capacity and 600 g of slurry was used in every test. The dimensions of the cell are shown in Figure 3. The cell was located in the base of the frame, directly below the impeller shaft. Experimental details of the flotation tests are summarised in Table 1. 

Table I Some physical properties of the coal and the Denver cell flotation test conditions.

Ink flotation test the time required for writing ink to penetrate through a floating piece of paper and to change the color of the upper surface. 

Flotation tests were carried out in a Denver-type, 2-1 laboratory cell. The concentrations of the reagents were specified as solution concentrations. The procedure of waste paper flotation is described elsewhere [5]. For the filler flotation an aqueous dispersion with 0.2% filler in tap water (pH 8.5) was stirred with the respective collector for 10 min and then floated for 5 min. The floated fillers were subsequently filtered the filtrate was dried at 150°—180°C and weighed to determine the recovery. 

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