A Calculation Method of Hydrometallurgical Purification Process Control Cycle Based on Oxidation-Reduction Potential
A technology for hydrometallurgy and control period, applied in the field of calculation of control period of hydrometallurgical purification process based on redox potential, can solve the problems of long control time period, process disturbance, long calculation time, etc., to achieve stable product quality, improve Product quality, the effect of saving the amount of addition
Active Publication Date: 2017-05-31
CENT SOUTH UNIV
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Problems solved by technology
When the control cycle time is too short, it is not conducive to observing the control effect; frequent adjustments will easily cause process disturbance, which is not conducive to the stability of long-term production; at the same time, the cycle is too short to make the dimension of numerical calculation too high, and the calculation time is too long or even impossible to solve
The control time period is too long, it is difficult to meet the zinc powder addition amount required by the change of impurity ion concentration in the reactor in time, and the concentration of impurity ions at the outlet is easy to exceed the standard, which is not conducive to the stable operation of the purification process
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Embodiment 1
[0067] Embodiment 1: The copper removal process of the hydrometallurgy zinc smelting process in a certain lead-zinc factory is taken as an example to illustrate the superiority of the present invention. In the first step, the essence of the reaction can be understood according to the value of ORP. Based on the data collected in the field of industrial operation, the change trend of ORP value and zinc powder content in the reactor over time is determined offline, such as figure 2 As shown, the response time T of the reaction process is determined according to the extreme value correspondence between the ORP value and the zinc powder content; in the second step, the distribution of the ORP response time is calculated from the extreme point pairs obtained in the first step, and serious overshooting is ignored. Statistical methods are used to make statistics on the distribution of response time, remove the cases with low probability, and take the obtained minimum response time T a...
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The invention discloses a method for calculating the control cycle of the hydrometallurgy purification process based on oxidation-reduction potential (ORP). The method comprises the steps: 1, determining the sequential variation relation between the ORP and main metal powder based on industrial operating data, and calculating the response duration of the main metal powder; and 2, further analyzing the statistical characteristics of the response duration and determining the control cycle of addition of the main metal powder. By means of the method, the problems that the fluctuation of the concentration of outlet impurity ions is large, the qualified rate is low and the product quality can hardly keep stable due to excessive addition or insufficient addition of the main metal powder owing to uncertainty of the control cycle of the purification process are solved; necessary conditions are provided for stable control over the concentration of the outlet ions and optimization of addition of the main metal powder in the hydrometallurgy purification process.
Description
technical field [0001] The invention belongs to the technical field of hydrometallurgical purification process control, and in particular relates to a method for calculating the control cycle of hydrometallurgical purification process based on oxidation-reduction potential. Background technique [0002] Hydrometallurgy is the process of separating impurities and extracting metals through chemical treatment or organic solvent extraction of metal mineral raw materials. It mainly consists of five processes: grinding, direct leaching, purification, electrolysis, and melting and casting. During the grinding process, the metal compounds and gangue in the concentrate are effectively dissociated and fully refined to form a slurry with a certain size distribution and sent to the leaching section. During the leaching process, the main metal and other valuable metals in the slurry are dissolved into the solution. The main metal solution after leaching still contains a large amount of ...
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IPC IPC(8): C22B3/46G06F19/00
CPCC22B3/46G16C20/10Y02P10/20
Inventor 阳春华张凤雪朱红求李勇刚张斌桂卫华
Owner CENT SOUTH UNIV