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Design Principle of Sulphur in Light-burned Magnesium Powder Manufacturers

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Design Principle of Sulphur in Light-burned Magnesium Powder Manufacturers

Date of release:2019-02-22 Author: Click:

1 Design Principle

The light burnt magnesia powder adopts mature and reliable coagulation and sedimentation treatment technology to ensure that each index of treated water meets the first-class discharge standard of GB8978-1996 of the National Comprehensive Wastewater Discharge Standard; the sewage treatment facilities should have small occupied area, low investment, low energy consumption and low treatment cost, which is suitable for the transformation project of thermal power plants; the vibration reduction and reduction of supporting equipment should be fully considered in design. Noise and other measures to avoid secondary pollution.

2 process flow

The solid content of slurry discharged from desulfurization tower is 15%. The main solid component is magnesium sulfite. The slurry discharged must be dehydrated before it can be further treated to obtain the desired by-products. In this project, the dewatering system includes dewatering supply tank, dewatering supply pump, centrifugal dewaterer, dryer and other related equipment.

The desulphurization slurry in the desulphurization tower is discharged from the slurry and pumped to the dehydration supply tank. The desulphurization by-product after concentration is conveyed to the hot air dryer by a screw conveyor through a centrifugal dehydrator. The byproduct with about 10% water content at the outlet of the dryer flows into a storehouse of by-product. The wastewater from the whole process enters the treatment system and is discharged after meeting the standard. This project desulfurization wastewater treatment process: neutralization, sedimentation, flocculation, clarification.

Neutralization: The acidic wastewater produced by flue gas desulfurization is elevated from the wastewater pump of the cyclone separator to the neutralizing box. The pH regulating system is set up in the neutralizing box. The dosage of lime milk is controlled by a control valve and a frequency converter to maintain the pH value of the wastewater in the neutralizing box (8.8-9.0). At this time, a large number of heavy metal ions (such as Zn2+, Mg2+) in the original wastewater are precipitated in the form of hydroxides, in order to make the wastewater The wastewater can be mixed evenly in the neutralizer, and a stirring motor is set up.

Settlement: The gravity of the wastewater in the neutralization tank flows to the settling tank, where a large amount of Mg and other heavy metals in the wastewater are precipitated from the wastewater in the form of very fine hydroxides and complexes. At the same time, in order to ensure the precipitation of other trace heavy metal ions in wastewater, organic sulfides were added into the settling tank to react with other heavy metal ions and sulfur ions to form insoluble metal sulfides. Owing to the fine particles of hydroxides and metal sulfides formed, it is not easy to settle down in wastewater. Therefore, the fine particles in wastewater can be flocculated by adding complex iron. For homogeneous mixing, sinking

A stirring motor is arranged in the falling box, and the wastewater is flowed into the flocculation tank by gravity.

Flocculation: The flocculant (PAM) is added to the flocculator to form a larger flocculant by stirring fine alum flowers to ensure solid-liquid separation in the clarifier. A stirring motor is arranged in the flocculation box.

Clarification: Wastewater from flocculation tank is separated from solid and liquid in clarification tank. Because the amount of wastewater is very small (5m3/n), the clarification tank adopts vertical flow sedimentation tank which is easy to install and maintain. It runs stably and reliably, and saves a set of mechanical equipment (rotary scraper). The clarifier forms concentrated sludge under the action of gravity concentration. The sludge is discharged by sludge screw pump. Clear water flows into the outlet tank from the surrounding outlet triangular weir. To clarify the sludge concentration meter installation, timing detection mud.

Because of high pH wastewater (8.8-9.0), so the installation of a stirring motor in the water tank, and is equipped with pH control system, pH control system with HC1 control metering pump, to ensure that water quality standards (pH=6 ~ 9), the water flushing pipe by the health to desulfurization island.

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