| 摘要 |
<p>A liquor analyser apparatus and method intended for use in real-time or near real-time in-field/on-line analysis of Bayer process liquors to determine the total alumina, total caustic, and total alkali concentrations, and if required, the total concentration of impurities, in the liquor is disclosed. The apparatus and method obviates the need for laboratory analysis, aside of any calibration analysis for initial set-up. The apparatus provides concentrations of alumina, total caustic and total alkali by relying on accurate determination of liquor temperature, density, sound velocity, conductivity and maximum conductivity of the liquor under isothermal dilution. The apparatus is formed around a vessels (11), (13), and (15) with sensors to measure these parameters. The vessels (11), (13), and (15) are fluidly connected in series, with vessel (15) draining to a reservoir (17). A pump (19) is provided to recirculate fluid from the reservoir (17) to the vessels (11), (13), (15) in a closed circuit manner. The vessels (11), (13), (15) and reservoir (17) are contained within a water jacket chamber (21) which is maintained at a suitable constant temperature. The apparatus has a sample inlet (23) and a water inlet (25), and a drain (27). An overflow (29) from the reservoir (17) connects to the drain to discharge fluid during dilution analysis of the fluid. Sample flows are controlled by automatic operation of valves MV1, MV2, MV3, and MV4. Water flow control is controlled via solenoid valves SV1, SV2, SV3, and SV4. Operation is automated by a PLC.</p> |
