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Method for controlling acid-zinc ratio of electrolyte in zinc hydrometallurgy electrolysis process

A technology of electrolyte zinc acid and hydrometallurgy zinc, which is applied in the direction of electrolysis process, electrolysis components, photography process, etc., can solve the problem that the flow rate of new liquid and the ratio of electrolytic acid zinc cannot be linearly measured.

Active Publication Date: 2016-10-26
CENT SOUTH UNIV
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Problems solved by technology

[0004] The invention provides a method for controlling the zinc-acid ratio of the electrolytic solution in the electrolysis process of zinc smelting by wet method, the purpose of which is to overcome the problem in the prior art that the flow rate of the new liquid and the ratio of the electrolytic zinc-acid cannot be measured linearly

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  • Method for controlling acid-zinc ratio of electrolyte in zinc hydrometallurgy electrolysis process
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  • Method for controlling acid-zinc ratio of electrolyte in zinc hydrometallurgy electrolysis process

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[0036] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0037] A method for controlling the zinc-acid ratio of an electrolyte solution in a zinc hydrometallurgy electrolysis process, the specific implementation steps are as follows:

[0038] The first step: online calculation of zinc acid ion concentration in the electrolyte of the zinc electrolysis process

[0039] Step 1: Identify unknown parameters in the current efficiency equation

[0040] Collect data records including current efficiency, current density, electrolyte zinc acid ion concentration, and data items in the on-site production data to form an identification sample set, and use the least square method to identify the five unknown parameters in the equation:

[0041] ε=a 0 +a 1 D+a 2 D. 2 +a 3 D. 3 +a 4 D. 4

[0042] a 0 =62.07268

[0043] a 1 =0.28154

[0044] a 2 =-0.00109

[0045] a 3 =1.9038*10- 6

[0046] a 4 =-1.231*10- ...

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Abstract

The invention discloses a method for controlling the acid-zinc ratio of an electrolyte in the zinc hydrometallurgy electrolysis process. The method aims to solve the problem that the acid-zinc ratio of the electrolyte is difficult to control automatically in the zinc electrolysis process. With the acid-zinc ratio of the electrolyte as the control target, the method comprises the steps that firstly, a nonlinear model of the zinc electrolysis process is established; secondly, linearization is conducted on the nonlinear model through an input-output feedback linearization method, so that the linear relation between the new electrolyte flow and the acid-zinc ratio of the electrolyte is obtained indirectly; and finally, progressive tracking control over the acid-zinc ratio of the electrolyte is achieved through a feedback control method. By the adoption of the method, the acid-zinc ratio is made to reach a set value rapidly and accurately, and the method has extremely important significance for energy saving and consumption reducing in the zinc electrolysis process.

Description

technical field [0001] The invention belongs to the technical field of zinc hydrolysis electrolysis process control, and relates to a method for controlling the acid-zinc ratio of electrolyte in the zinc hydrolysis electrolysis process. Background technique [0002] Electrolysis is the most critical process of zinc hydrometallurgy, and its energy consumption accounts for about 75%-80% of the entire zinc smelting process. The principle of the reaction is to pass direct current into the zinc sulfate solution to precipitate zinc ions in the form of simple substances. The zinc electrolysis process has very strict requirements on the concentration ratio of sulfuric acid and zinc ions in the electrolyte (hereinafter referred to as the acid-zinc ratio). Affected by the time-of-use pricing policy for electricity charges, the domestic zinc electrolysis process mostly adopts a time-of-use power supply method for production. When the current density changes, it is necessary to adjust ...

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Application Information

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IPC IPC(8): C25C7/06C25C1/16
CPCC25C1/16C25C7/06Y02P10/20
Inventor 阳春华邓仕钧李勇刚朱红求刘文德
Owner CENT SOUTH UNIV
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