Kaolin slurry

In a similar way to the testing above, a sample of kaolin slurry was received and subjected to a series of tests based on the ASTM E723-91 procedure. The same BIT resistant inoculum was used but in this instance, the opportunity was taken to examine the activity of chloromethylisothiazolinone/methylisothiazolinone (CIT/MIT) as a preservative both alone and in combination with Bronopol. 

Figure 3 Preservative perjormance oj tSronopol in a kaolin slurry using the ASTM E/23-91 test...

A kaolin slurry (density = 1200 kg/m n = 0.2 and m = 25 Pa-s") flows under gravity from reservoir A to B both of which are of large diameter, as shown in Figure 3.27. Estimate the flow rate of slurry through the 50 mm diameter connecting pipe of total length of 75 m. 

Bingham plastic (kaolin slurries) Bingham plastics (kaolin slurries)... 

Herschel and Bulkley (1928) developed a model that has been extensively applied to sewage sludge, kaolin slurries, and mine tailings ... 

Slatter et al. (1996) reported that Kemblowski and Kolodziejski (1973) found that the Dodge and Metzner model did not well represent the flow of kaolin slurries. They derived the following empirical equation ... 

Rio Capim, Brazil Geho 2 piston diaphragm pumps for kaolin slurry transportation, 293 mYh at 57 bar... 

Betsed on laboratory test loop measurements the kaolin and fluidic ash slurries can be determined as time independent non-Newtonian yield pseudo-plastic suspensions. On the contrary a considerable effect of shearing during initial period of flow in pipe was found out for fly ash-gypsum mixture, see Fig. 2. However, after a relative short time about one hour, the decrease of pressure losses finished and slurry became stabilised. This behaviour is probably due to physico-chemical activity of ash and gypsum after mixing with water. The Fig. 3 shows plot of wall shear stress t, versus pseudo-shear rate (8 V/D) for the kaolin slurry flow in three different pipes and for representative ash-water mixtures in pipe of diameter D = 17.5 mm. The transition between laminar and turbulent flow is shown by the steep change in slope of the flow curves. 

Fig. 4a. The effect of the flow behaviour index n and slurry mean velocity V on the pressure gradient ratio // ig of kaolin slurry (W.m. - Wilson model, S.m. - Slatter model)...

Flow behaviour index n for kaolin slurries varies in the range from 1.0 to 0.5 for the Slatter model and from 0.9 to 0.6 for the Wilson model. For ash-water and ash-gypsum-water mixtures flow behaviour index n reach higher value than for kaolin slurries for both models. 

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