Method for online detection of ferrous ion content in concentrated acid
A technology of ferrous ion and concentrated acid, applied in the field of detection, can solve the problems of low production capacity, pipeline blockage, long window period of factory quality control and so on
Inactive Publication Date: 2015-08-12
CHINA STEEL
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Therefore, such a detection method will lead to a relatively long window period in factory quality control, which will cause delays in process quality control and lead to regulation hysteresis, thereby reducing the stability of the roasting process.
[0005] Such regulation hysteresis will seriously affect the production of iron oxide in the roasting process
For example, when the content of ferrous ions in concentrated acid is too high, supersaturated crystallization will occur, which will lead to blockage of pipelines transporting concentrated acid
On the other hand, when the content of ferrous ions in the concentrated acid is too low, it may cause problems of insufficient purity and low production capacity of iron oxide products
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[0023] In order to improve the problems caused by traditional detection methods, the present invention proposes a method for online real-time detection of ferrous ion content in concentrated acid. In an embodiment, when detecting ferrous ions in concentrated acid, a relational expression between the density of concentrated acid and the content of ferrous ions can be established first.
[0024] Generally speaking, concentrated acid in steel mills is mainly a solution composed of hydrochloric acid components, ferrous chloride components and water solvents. Wherein, since the hydrochloric acid component and the ferrous chloride component are the main electrolyte components in the concentrated acid solution, the concentration of the hydrochloric acid component and the ferrous chloride component will affect the concentrated acid solution. Therefore, in the embodiment, the measurement and regression analysis methods can be used to establish the relationship between the density and t...
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The invention relates to a method for on-line detecting the content of ferrous ions in a concentrated acid. The method comprises the following steps of transmitting the concentrated acid to a roasting furnace by using a delivery pipe at a preset temperature, wherein the concentrated acid comprises a hydrochloric acid ingredient, a ferrous chloride ingredient and a water solvent, the preset temperature is 75 DEG C, and the content of the hydrochloric acid ingredient is 400 g / litre. An on-line proportion apparatus is arranged in a conveying pipe in front of the roasting furnace. The on-line proportion apparatus is used for measuring the density of the concentrated acid. The content of the ferrous ions in the ferrous chloride ingredient is calculated by using the equation and the above density of the concentrated acid, wherein the equation that the content of the ferrous ions is equal to -902.818+803.4678*the density of the concentrated acid.
Description
technical field [0001] The invention relates to a detection method, and in particular to a method for online detection of ferrous ion content in concentrated acid. Background technique [0002] At present, most of the conventional steelmaking plants are equipped with regeneration acid plant (Acid Regeneration Plant; ARP). The task of this regenerated acid plant is mainly to treat the waste hydrochloric acid (HCl) solution produced after the hot and cold rolling process cleans the steel. In the regenerative acid factory, the waste hydrochloric acid solution is roasted into iron oxide subsidiary products, and the hydrochloric acid solution is recovered at the same time, so as to continue to be used for cleaning steel. [0003] During the entire roasting operation, the concentrated acid is the raw material for roasting, and the content of ferrous ions contained in the concentrated acid is the most important quality control item. At present, the method for detecting the conten...
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IPC IPC(8): G01N9/36
Inventor 陈文昌汪上晓卢启聪周正晃沈瑞富
Owner CHINA STEEL