Coal-water slurry and preparation method thereof

Abstract

The invention provides coal-water slurry and a preparation method thereof. The coal-water slurry comprises low-rank coal slurry A with the coal particle size smaller than or equal to 2.4 mm, low-rank coal slurry B with the coal particle size smaller than or equal to 0.5 mm and low-rank coal slurry C with the coal particle size smaller than or equal to 0.3 mm, wherein the mass ratio of the slurry A to the slurry B to the slurry C is (5-8):(1-3):(1-2); the particle size of 90% or above of coal particles in the low-rank coal slurry A is larger than or equal to 75 [mu]m; the particle size of 90% or above of coal particles in the low-rank coal slurry B is larger than or equal to 25 [mu]m and smaller than 50 [mu]m; the particle size of 90% or above of coal particles in the low-rank coal slurry C is larger than or equal to 5 [mu]m and smaller than 15 [mu]m. According to the invention, the low-rank coal slurry A, the low-rank coal slurry B and the low-rank coal slurry C are mixed through a multi-peak grading technology, and gaps formed by coal particle accumulation are perfectly filled with coal particles of different particle sizes, so that the stacking density is increased, the low-rank coal coal-water slurry with the concentration being 55% or above is obtained, and the problem that the low-rank coal slurry is hardly prepared into high-concentration coal-water slurry is solved well.

Description

technical field [0001] The invention belongs to the field of coal-water slurry preparation, and relates to a coal-water slurry and a preparation method thereof, in particular to a method for preparing coal-water slurry using a multi-peak gradation technology, and in particular to a method for preparing a coal-water slurry by using a multi-peak gradation technology. A method for preparing high-concentration coal-water slurry from coal. Background technique [0002] my country's energy structure is rich in coal, poor in oil, and low in gas. Coal accounts for about 70% of my country's energy consumption, and for a long time to come, coal will remain the main energy source in my country. Although my country's coal reserves are abundant, they are mainly low-rank coals with a low degree of metamorphism, and they are concentrated in my country's coal chemical development areas-Shaanxi, Inner Mongolia, Xinjiang and other places. Low-rank coal has low degree of metamorphism, large i...

AI Technical Summary

Problems solved by technology

At present, the preparation process of coal water slurry in my country is mostly based on the preparation process of single mill. The particle size of coal slurry presents a single-peak normal distribution, and it is impossible to prepare high-concentration coal water slurry for difficult-to-slurry coal types.

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