A clean coal dehydration process and equipment combination for realizing the process

Abstract

The invention relates to a coal preparation process, in particular to a floatation-cleaned-coal dehydration process and simultaneously relates to a set of equipment combination for realizing same. The dehydration process is characterized by comprising the following steps of: leading floatation cleaned coal to automatically flow into a settling and filtering centrifuge for dehydration or pumping the floatation cleaned coal into the settling and filtering centrifuge by using a pump for dehydration, wherein the dehydrated floatation cleaned coal is directly used as a final product; and leading centrifugate and filtrate of the settling and filtering centrifuge to return to the step of floatation feeding, namely participating in floatation operation again. The equipment combination is characterized by being provided with no filter press and no secondary floatation machine, and the settling and filtering centrifuge is used as only equipment for dehydrating the floatation cleaned cola. The process and the equipment combination, provided by the invention, are favorable for greatly saving construction cost and reducing maintaining expenses and product cost, not only can ensure that the moisture index of a floatation cleaned-coal product is qualified, but also can simultaneously ensure the uniformity of quality indexes, such as ash content and the like, of the floatation cleaned-coal product.

Description

technical field [0001] The invention relates to a coal preparation process, in particular to a flotation clean coal dehydration process and a set of equipment combination for realizing the process. technical background [0002] The moisture content of clean coal is an important indicator of the quality of clean coal products. At present, the selection of coal slime is generally through the flotation process, which inevitably leads to an increase in coal moisture content, which requires a dehydration process to reduce the clean coal product. Moisture content to achieve quality indicators. [0003] The following two flotation clean coal dehydration processes are generally used at home and abroad: the first one is the filter press dehydration process. Including various filter presses with different equipment and the same process; this system has simple process, less investment, and lower production cost, but there is a high moisture content in clean coal products, and the prod...

AI Technical Summary

Problems solved by technology

This is a dehydration process developed in recent years. Its advantages are low moisture in clean coal products, less investment, and lower production costs, but there are still certain defects: the process system is relatively complicated, and there are still a small amount of filter cake agglomeration. The phenomenon

This measure basically eliminates the "ash difference" of flotation clean coal products, but at the same time leads to complex process systems, increased investment, and reduced clean coal yields

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