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Slurry measurement

The size of the daytank will affect the life of the slurry, measured in days, but not in turnovers. Since some slurry health measures are a function of time and others a function of turnovers, one must decide which is more important. [Pg.72]

According to the vendor, fluid introduced into the soil may create excess slurry. For example, it is anticipated that the creation of a barrier in hard soils may result in an overflow slurry measuring up to one half of the volume of the trench. Researchers state that barriers are limited by the depth and directional control of the drilling technology and limited by the ability on nonintmsive techniques to verify barrier continuity. [Pg.643]

Density of a substance may be defined as the weight of a substance per unit volume. In principle, the bulk density of agglomerated particles in the slurry can offer an indirect measurement of the abrasive particle hardness. The bulk density of the particle can be calculated by using Equation 7.16, excluding the open pores and voids from the volume calculation, where p stands for the specific gravity of the slurry measured using a pycnometer [77]. [Pg.227]

Research various particle-size distribution and chemical concentration measurement technologies and related instrumentation. Create a list of their capabilities and limitations, measurement ranges, and accuracy and repeatability. Evaluate the applicability of these in the CMP slurry measurements. Discuss the possibilities of zeta-potential changes as a result... [Pg.622]

The glucose solution (72 g glucose in 400 ml water) was heated in the reactor to 50°C. Once the temperature was stabilized, the catalyst (meat = 54-200 mg) was added to the solution and the oxidation reaction started by introducing oxygen (flow rate 0.4 l.min 1) in the stirred (1000 rpm) slurry. Measurements performed with 50 to 100 mg catalyst at different stirring rates (in the range 1000-1800 rpm) confirmed the absence of diffusional limitations under these conditions. After 4 hours reaction, the oxygen inlet was turned off and the... [Pg.519]

Figure 9. Oxidation in variable concentration slurries. Measured [S4 ] (26) O, 20 , 30 and A, 50 g/L. Model solid lines for each slurry density shown. ki.s = 0.35 L A mol 1 pHt, 4.5 and 40°C. Figure 9. Oxidation in variable concentration slurries. Measured [S4 ] (26) O, 20 , 30 and A, 50 g/L. Model solid lines for each slurry density shown. ki.s = 0.35 L A mol 1 pHt, 4.5 and 40°C.
Acid-Base Behavior. The relative acidity-basicity of the filler, generally determined by measuring the pH value of a slurry of a specific mass of filler in 100 mL of deionized water, can influence the behavior of a filler in some systems. For example, the curing behavior of some elastomers is sensitive to the pH value of carbon black. [Pg.367]

Separation Efficiency. Similarly to other unit operations in chemical engineering, filtration is never complete. Some soflds may leave in the hquid stream, and some Hquid will be entrained with the separated soHds. As emphasis on the separation efficiency of soHds or Hquid varies with application, the two are usually measured separately. Separation of solids is measured by total or fractional recovery, ie, how much of the incoming solids is coUected by the filter. Separation of Hquid usually is measured in how much of it has been left in the filtration cake for a surface filter, ie, moisture content, or in the concentrated slurry for a filter-thickener, ie, solids concentration. [Pg.388]

The effect of mechanical treatment on floe behavior is illustrated in Figure 5. In one work (40), identical slurries were treated with varying doses of the same polymer. At each dosage, it can be assumed that the same type of floe formed at the same rate. However, the dosage response was completely different depending on which parameter of the flocculated slurry was measured. Thus the term optimal flocculation caimot be appHed to any flocculant—substrate combination if the soHd—Hquid separation process or process parameter is not specified. [Pg.35]

Because of these characteristics electromagnetic flow meters have been widely appHed to the measurement of difficult Hquids such as raw sewage and wastewater flows, paper pulp slurries, viscous polymer solutions, mining slurries, milk, and pharmaceuticals. They ate also used in less demanding apphcations such as the measurement of large domestic water volumes. [Pg.65]

Measurement by Electromagnetic Effects. The magnetic flow meter is a device that measures the potential developed when an electrically conductive flow moves through an imposed magnetic field. The voltage developed is proportional to the volumetric flow rate of the fluid and the magnetic field strength. The process fluid sees only an empty pipe so that the device has a very low pressure drop. The device is useful for the measurement of slurries and other fluid systems where an accumulation of another phase could interfere with flow measurement by other devices. The meter must be installed in a section of pipe that is much less conductive than the fluid. This limits its appHcabiHty in many industrial situations. [Pg.110]

Carbonate is measured by evolution of carbon dioxide on treating the sample with sulfuric acid. The gas train should iaclude a silver acetate absorber to remove hydrogen sulfide, a magnesium perchlorate drying unit, and a CO2-absorption bulb. Sulfide is determined by distilling hydrogen sulfide from an acidified slurry of the sample iato an ammoniacal cadmium chloride solution, and titrating the precipitated cadmium sulfide iodimetrically. [Pg.175]

Samples that contain suspended matter are among the most difficult types from which to obtain accurate pH readings because of the so-called suspension effect, ie, the suspended particles produce abnormal Hquid-junction potentials at the reference electrode (16). This effect is especially noticeable with soil slurries, pastes, and other types of colloidal suspensions. In the case of a slurry that separates into two layers, pH differences of several units may result, depending on the placement of the electrodes in the layers. Internal consistency is achieved by pH measurement using carefully prescribed measurement protocols, as has been used in the determination of soil pH (17). [Pg.467]

Slurry Viscosity. Viscosities of magnesium hydroxide slurries are determined by the Brookfield Viscometer in which viscosity is measured using various combinations of spindles and spindle speeds, or other common methods of viscometry. Viscosity decreases with increasing rate of shear. Fluids, such as magnesium hydroxide slurry, that exhibit this type of rheological behavior are termed pseudoplastic. The viscosities obtained can be correlated with product or process parameters. Details of viscosity deterrnination for slurries are well covered in the Hterature (85,86). [Pg.350]

Fig. 24. Flow meters for on-line measurement of slurry flow rates (a) magnetic and (b) ultrasonic (6). Fig. 24. Flow meters for on-line measurement of slurry flow rates (a) magnetic and (b) ultrasonic (6).
Aqueous Solution Viscosity. A special solution preparation method is used for one type of measurement of aqueous solution viscosity (96). The appropriate amount of poly(ethylene oxide) resin is dispersed in 125 mL of anhydrous isopropyl alcohol by vigorous stirring. Because the resin is insoluble in anhydrous isopropyl alcohol, a slurry forms and the alcohol wets the resin particles. An appropriate amount of water is added and stirring is slowed to about 100 rpm to avoid shear degradation of the polymer. In Table 4, the nominal resin concentration reported is based on the amount of water present and ignores the isopropyl alcohol. [Pg.343]

Alkalinity (Soluble Soda) Determination. The surface alkalinity or soluble or leachable soda is determined by making a fixed weight percent slurry in water and determining the alkalinity of the solution by pH measurement or acid titration. Sodium ion-sensitive electrodes have been investigated. [Pg.172]

Magnetic flow meters are sometimes utilized in corrosive Hquid streams or slurries where a low unrecoverable pressure drop and high rangeabiHty is required. The fluid is required to be electrically conductive. Magnetic flow meters, which use Faraday s law to measure the velocity of the electrically conductive Hquid, are relatively expensive. Their use is therefore reserved for special situations where less expensive meters are not appropriate. Installation recommendations usually specify an upstream straight mn of five pipe diameters, keeping the electrodes in continuous contact with the Hquid. [Pg.65]

In industrial production of acid-modified starches, a 40% slurry of normal com starch or waxy maize starch is acidified with hydrochloric or sulfuric acid at 25—55°C. Reaction time is controlled by measuring loss of viscosity and may vary from 6 to 24 hs. For product reproducibiUty, it is necessary to strictly control the type of starch, its concentration, the type of acid and its concentration, the temperature, and time of reaction. Viscosity is plotted versus time, and when the desired amount of thinning is attained the mixture is neutralized with soda ash or dilute sodium hydroxide. The acid-modified starch is then filtered and dried. If the starch is washed with a nonaqueous solvent (89), gelling time is reduced, but such drying is seldom used. Acid treatment may be used in conjunction with preparation of starch ethers (90), cationic starches, or cross-linked starches. Acid treatment of 34 different rice starches has been reported (91), as well as acidic hydrolysis of wheat and com starches followed by hydroxypropylation for the purpose of preparing thin-hoiling and nongelling adhesives (92). [Pg.344]


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See also in sourсe #XX -- [ Pg.74 , Pg.75 ]




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Conductivity measurement, slurry size

Slurries measuring techniques

Slurry concentration measurements

Slurry solids concentration measurement

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