Silicon steel alkali rinse purification method and device
A technology for alkaline washing solution and silicon steel alkali, which is applied in chemical instruments and methods, water/sludge/sewage treatment, centrifugal separation water/sewage treatment, etc. problems, to reduce the probability of blockage, improve cleanliness, and ensure the effect of normal operation
Active Publication Date: 2012-10-10
BAOSHAN IRON & STEEL CO LTD
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Problems solved by technology
The silicon dioxide in the alkaline washing liquid will react with the alkaline liquid to form sodium silicate at high temperature, and the sodium silicate and the iron powder in the alkaline washing liquid will work together to make a large amount of alkali scale on the inner wall of the alkaline liquid circulation pipe. cause blockage of pipes
This soda scale is very hard and difficult to remove from the pipes, necessitating regular shutdowns for cleaning, and after regular mechanical removal, the system would reoccur less than two months after cleaning, seriously affecting the system Normal operation, resulting in a drop in lye cleaning efficiency
At the same time, due to the presence of a large amount of iron powder and silica mud in the lye, it seriously affects the normal operation of the unit, affects the quality of the strip surface, and causes huge economic losses.
[0003] At present, most of the lye purification systems in silicon steel plants use magnetic filters to purify the alkali washing liquid, but the magnetic filters can only remove part of the iron powder, and cannot remove a large amount of oxidized substances and solid particles produced in the alkali washing process, and the carbon dioxide in the oxidized substances Silicon will react with hot liquid, causing blockage of alkali circulation system pipeline and reducing the quality of alkali-washed strip surface
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[0028] After analyzing the composition and content of solid particles in the alkaline washing liquid, the liquid mainly contains iron oxide powder and a small amount of insoluble matter such as silicon dioxide and colloidal sodium silicate, and the average particle size of the solid particles is 40 μm. The moving strip undergoes alkali washing in the electrolytic tank, and the alkaline washing liquid enters the purification system through the bottom of the electrolytic tank. First, most of the solid particles in the alkali liquid are separated in a centrifuge, and the suspension enters the drum from the feed pipe 1. , the solid phase particles are accelerated by the centrifugal force to settle to the inner wall of the drum under the action of the centrifugal force field, and the settled particles are pushed by the blades of the conveying screw propeller 2, from the settling area (straight cylinder section) through the drying area (cone section) to the solid phase. The phase out...
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Abstract
The invention provides a silicon steel alkali purification method and a device. The iron powder and the silicon dioxide in the alkali liquor can be eliminated timely by a centrifugal separator and a gravity setting tank of the tank so as to ensure the content of the iron powder and the silicon dioxide particles in the alkali liquor to be in very low level, thus achieving the purpose of preventingan alkali liquor circulating system from being blocked and increasing the quality of alkali washing band steel surface.
Description
technical field [0001] The invention relates to the field of silicon steel alkali washing, in particular, the invention relates to a method for purifying silicon steel alkali washing liquid and the equipment used therein. Background technique [0002] Alkali cleaning is an important link in the production of silicon steel. With the extension of use time, a large amount of impurities, such as iron powder and silicon dioxide, will accumulate in the alkaline cleaning solution. The silicon dioxide in the alkaline washing liquid will react with the alkaline liquid to form sodium silicate at high temperature, and the sodium silicate and the iron powder in the alkaline washing liquid will work together to make a large amount of alkali scale on the inner wall of the alkaline liquid circulation pipe. cause pipe blockage. This soda scale is very hard and difficult to remove from the pipes, necessitating regular shutdowns for cleaning, and after regular mechanical removal, the system ...
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IPC IPC(8): C02F9/06C02F1/38C02F1/52C02F1/461C02F103/16
Inventor 李准邢启宏王文华何家峰黄大新章培莉
Owner BAOSHAN IRON & STEEL CO LTD