A kind of lignite additive and lignite dehydration treatment method

Abstract

The invention provides a lignite dehydration additive and a lignite dehydration treatment method. The lignite dehydration additive is one of water and anionic surfactant, nonionic surfactant, organic acid, water glass, carbonate and chloride salt compounds Or several kinds are mixed and prepared in proportion, and the proportion of water is more than 80%. The lignite dehydration treatment method includes: stacking in the open air, spraying lignite dehydration additives; crushing; adding lignite additives, and forming honeycomb blocks by cold pressing; finally drying in the air or at low temperature. The invention solves the situation that the internal moisture of lignite (especially soft lignite) cannot be dried in the natural state or only with low-temperature hot air (less than 45°C); it can make the total moisture greater than 55% and the low calorific value less than 1600Kcal / kg lignite can be fully utilized in many industrial fields. The method of the invention significantly increases the hydrophobicity and permeability of the "internal water" and "bound water" of the lignite, and greatly improves the industrial utilization value of the lignite.

Description

technical field [0001] The invention relates to lignite dehydration technology, in particular to a lignite dehydration additive and a lignite dehydration treatment method. Background technique [0002] Lignite, also known as wood coal, is the least coalified mineral coal. It is predicted that the geological reserves of lignite in the world are about 4 trillion tons, accounting for 40% of coal reserves. The discovered lignite resources in China are 131.142 billion tons, accounting for about 13% of China's remaining coal resources. Under the current situation of increasingly tense global energy resources, the economic value of lignite and its related processing and production technologies are increasingly recognized by the world's energy circles. Pay attention to. [0003] However, due to the high moisture content of lignite (30%-60%), the low calorific value greatly limits the use value of lignite. No matter the high moisture contained in earthy lignite or dark lignite is...

AI Technical Summary

Problems solved by technology

A further increase in temperature will lead to the decomposition of more and more hydroxyl functional groups, which will cause changes in the properties of lignite

This is not conducive to the industrial utilization of lignite

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