Method for desulfurization of coal by electrochemical catalytic oxidation

Abstract

The invention relates to a method for desulfurization of coal by electrochemical catalytic oxidation, although the exiting coal chemical desulfurization methods can almost remove all inorganic sulfur and part of organic sulfur in the coal, most of the methods need strong acid, strong base and strong oxidants and need to be operated under the conditions of high temperature and high pressure, the process conditions are harsh and the cost is high; furthermore, a plurality of chemical methods can cause series damages to the structure and the nature of the coal. The invention discloses the method for desulfurization of the coal by the electrochemical catalytic oxidation, which comprises the following steps: (A) adopting NaI with the concentration of 1.5mol / L as supporting electrolyte, weighing a certain amount of the electrolyte, adding into an anode chamber in an electrolysis bath, simultaneously adding the supporting electrolyte in the same volume and the same composition into a cathode chamber, and well connecting a gas collecting system; (B) adding a coal sample with the particle size of below minus 200 meshes into the anode chamber of the electrolysis bath, and controlling the concentration of coal slurry at 0.05g / ml; (C) connecting with circulating water of a water bath tank, and energizing for electrolysis; and (D) filtering electrolyte solution after energizing for 4 hours, washing the coal sample, drying, weighing and carrying out sulfur, calorific value, ash content and infrared spectrum analysis. The technology is used for the coal desulfurization.

Description

Technical field: [0001] The invention relates to a method for electrochemical catalytic oxidation desulfurization of coal. Background technique: [0002] At present, the proven reserves of high-sulfur coal resources in China have reached 62 billion tons, accounting for about 25% of the total coal reserves. The pressure of environmental protection requirements is one of the main reasons restricting the development of my country's coal industry, especially the problem of sulfur in coal. my country's SO in 2007 2 The emission is 26.5 million tons, ranking first in the world. It is estimated that by 2020, SO 2 Emissions will reach 40.56-57.38 million tons. Acid rain has covered 40% of the country's land area and has a great impact on the global atmosphere. The SO caused by coal burning 2 Emissions accounted for 85% of the total emissions. In view of this severe situation, the state has formulated a policy of no longer approving the construction of coal mines producing high-...

AI Technical Summary

Problems solved by technology

Although these methods can remove almost all the inorganic sulfur and some organic sulfur in coal, most of them need strong acid, strong alkali and strong oxidant and operate under high temperature and high pressure conditions, the process conditions are harsh, the cost is high, and some chemical methods are harmful to coal Severe damage to the structure and properties of