Iron & Steel

"From water intake to steel rolling, our filtration and hydrocyclone equipment protect water quality and critical equipment across the entire production line."

The iron and steel industry relies on complex water systems at every stage—from raw water intake to final product dispatch. Efficient and reliable solid-liquid separation is essential throughout. Crest's filters and hydrocyclones address the full spectrum of water treatment needs, from separating slag in blast furnace granulation water to safeguarding precision nozzles in continuous casting spray systems.

Key Application.

Raw Water Filtration

Process:

Steel plants typically use surface water from rivers or lakes. Raw water must be filtered to remove debris before entering the plant.

Problem:

Natural water sources contain sand, silt, and biological debris that do not meet plant water quality standards.

Solution:

Install a hydrocyclone and a self-cleaning filter in series at the intake pump outlet. The hydrocyclone removes coarse sand particles by centrifugal force; the self-cleaning filter intercepts remaining suspended solids. The two-stage system delivers clean water to all plant use points.

Products:

● Liquid-Solid Hydrocyclone

● Automatic Self-Cleaning Filter

Blast Furnace Cooling Water & Slag Granulation Water

Process:

Blast furnace operation requires continuous cooling water for the lining, while molten slag is quenched and granulated, generating large volumes of slag water. This section covers filtration of the BF cooling water supply and desanding of slag water for reuse.

Problem:

Suspended solids in cooling water cause scaling on pipe walls, reducing heat transfer and risking pipe bursts. Slag water contains abrasive slag particles and fibers that quickly wear down and clog heat exchangers, causing efficiency loss and production disruptions.

Solution:

Install a high-precision self-cleaning filter on the cooling water supply main before it enters the blast furnace. Install a hydrocyclone at the slag settling tank outlet to remove slag particles and protect downstream heat exchangers.

Products:

● Liquid-Solid Hydrocyclone

● Automatic Self-Cleaning Filter

Converter & Continuous Casting Turbid Loop Water

Process:

Converter steelmaking and continuous casting generate large volumes of turbid loop water containing mill scale and suspended solids. This section covers treatment of the converter cooling return main and the CC turbid loop return main.

Problem:

The secondary cooling spray system in continuous casting uses precision nozzles. Mill scale and particulates in the water clog these nozzles, causing uneven slab cooling and resulting in surface cracks, center segregation, and increased scrap rates.

Solution:

Install a self-cleaning filter on the converter cooling return main before water enters the cooling tower. On the CC turbid loop return main, install a hydrocyclone and a self-cleaning filter in series before the settling tank—the hydrocyclone removes coarse mill scale, while the filter captures fine suspended solids.

Products:

● Liquid-Solid Hydrocyclone

● Automatic Self-Cleaning Filter

Rolling Mill & Laminar Cooling Water

Process:

In hot rolling, rolls and the rolled steel require large volumes of cooling water. The strip then passes through laminar cooling for rapid temperature reduction to coiling temperature. This section covers precision filtration for both rolling mill and laminar cooling water.

Problem:

Sand in cooling water accelerates roll wear and can become embedded in the strip surface, causing defects. The laminar cooling system uses hundreds of precision nozzles that are easily clogged by fine particles, leading to uneven cooling across the strip width and compromising strip shape and coiling quality.

Solution:

Install high-precision self-cleaning filters at two key points: on the clean circulating water supply main before branching to the rolling mill, and at the laminar cooling supply pump outlet. This provides end-point precision filtration for both systems.

Products:

● Automatic Self-Cleaning Filter