摘要:

Tests with radioactive tracers were used for experimental analysis of a multiple-effect evaporator plant. The residence time distribution of the liquor in each evaporator was described by one or two perfect mixers with time delay and by-pass flow terms. The theoretical model of a single evaporator unit was set up on the basis of its instantaneous heat and mass balances and such models were fitted to the test data. The results were interpreted in terms of physical structures of the evaporators. Further model parameters were evaluated by conventional step tests and by measurements of process variables at one or more steady states. Computer simulation and comparison with the experimental results showed that the model produces a satisfactory response to solids concentration input and could be extended to cover the steam feed and liquor flow inputs. An optimal feedforward control algorithm was then derived for a two unit, co-current evaporator plant. Because the operation of such a plant is affected by the output of the washer plant preceding it, the latter was also modelled and the control of the combination of both plants developed.

ISSN:0021-1915    

DOI:10.1080/10256018908624088

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

摘要:

The ore-dressing plant discussed in this report consists of the steps of grinding and flotation. Its optimization is based on steady state simulation of the mass balances with a plant model. The model data are obtained by tracer tests and analysis. An evaluation of performance of the plant has to observe the recovery of the valuable mineral, the throughput of the system and the grade of the concentrate which are outputs of the flotation plant. Simulation with the flotation plant model yields that combination of values of controllable inputs to flotation which corresponds to an optimal operation of the conditioning an flotation system, for a specified feed and its fractional composition. Simulations for other feeds and compositions advise how the grinding should be controlled, for a better overall performance.

ISSN:0021-1915    

DOI:10.1080/10256018908624089

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

ISSN:0021-1915    

DOI:10.1080/10256018908624090

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor

ISSN:0021-1915    

DOI:10.1080/10256018908624091

出版商:Taylor & Francis Group    

年代:1989

数据来源: Taylor