Dehydration process in metallurgical industry -- Henan Hongxing

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Dewatering technology in mineral processing of metallurgical industry

The metallurgical industry has certain requirements for ore grade, so metallurgical plants often have to carry out mineral processing. At the end stage of mineral processing, the concentrate is often dehydrated. The common equipment of dehydration workshop includes Thickener , filter press dryer

However, with the exception of a few rich ores, the general grade (i.e. the percentage of valuable components in the ore) is relatively low. It is difficult and uneconomical to smelt these ores directly. Therefore, metallurgy has certain requirements for ore grade. For example, the grade of iron in iron ore shall not be lower than 45% - 50%; the grade of copper in copper ore shall not be lower than 3% - 5%. Therefore, low grade lean ore must be beneficiated before smelting.

In addition to useful components, ores often contain harmful impurities, such as sulfur and phosphorus in iron ores. These harmful impurities should be removed by mineral processing before smelting, otherwise the smelting process will be complicated and the smelting products will be affected. In mineral processing, it is necessary to protect useful mineral crystals and keep the use value of minerals unchanged Mineral Processing And the main principle of equipment selection.

Most of the processed products contain a lot of moisture, which is unfavorable for transportation and smelting processing. Therefore, before smelting, it is necessary to remove the moisture in the mineral processing products. Dehydration is often carried out in the following stages:

1. Concentrate. Concentration is an operation in which the solid particles in mineral processing products are precipitated under the action of gravity or centrifugal force, so as to remove part of the water. Concentration is usually carried out in a thickener.

2. Filtration. Filtration is to make the pulp pass through a permeable but impervious solid particle spacer to achieve solid-liquid separation. Filtration is a further dehydration operation after concentration, which is generally carried out on a filter press.

3. Dry. Drying is the stage of the dehydration process. It is based on the principle of heating and evaporation to reduce the moisture in the product. But only when the dehydrated concentrate needs to be dried. Drying operation is generally carried out in the dryer, and other drying devices are also used. It is composed of dehydration and dehydration workshop.

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