Coal washing water treating agent and preparation method

Abstract

The invention disclose washing coal water and preparing method, which comprises the following steps: allocating magnesium chloride with grain size at 0.2-2.0 millimeter and moisture capacity at 4%-15% and polyacrylamide with fineness at 40-100 order; spreading polyacrylamide on magnesium chloride; stirring evenly.

Description

technical field [0001] The invention relates to a coal washing water treatment agent, in particular to a composition and a preparation method of a coal washing water treatment agent. Background technique [0002] The coal washing water after coal preparation contains a large amount of suspended solids. The suspended solids are extremely fine coal powder, mineral powder and other particles. The coal washing water needs to be treated to separate the suspended solids before it can meet the discharge standard or be recycled. The suspended solids in coal washing water are very fine particles, which are difficult to settle down. When treating coal washing water, it is necessary to add a treatment agent to the coal washing water to make the fine particles flocculate and settle down, so that the suspended solids can be separated. Among the treatment agents, polyacrylamide is a high-efficiency coal washing water treatment agent. When treating coal washing water, polyacrylamide should...

AI Technical Summary

Problems solved by technology

In the coal washing water treatment agent used in combination with polyacrylamide and magnesium chloride, magnesium chloride is a water-soluble inorganic salt that dissolves quickly in the water in the dissolution tank; polyacrylamide is a water-soluble polymer Compounds, macromolecules have a relatively large molecular weight, and the accumulation state of the molecules is a random coil structure. When polyacrylamide is dissolved in water, the molecular clusters of the random coil structure swell first, and then the polyacrylamide molecules can be swollen from the swollen molecules. The polyacrylamide solution diffuses into the water to form a polyacrylamide aqueous solution. The dissolution rate of polyacrylamide in the water in the dissolution tank is very slow; in addition, the dissolution rate of polyacrylamide in water is closely related to the fineness of polyacrylamide. The smaller the particles of acrylamide, the faster it dissolves in water. For example, the dissolution rate of polyacrylamide with a fineness of 40-100 mesh in water is much faster than that of polyacrylamide with a fineness of about 10 mesh. When the particles are too fine, the fine polyacrylamide particles will gather into agglomerates due to the effect of surface tension after being put into water, and the agglomerated polyacrylamide is more difficult to dissolve in water, so it is used as a water treatment agent in the prior art The particles of polyacrylamide are not very small. Although the particles will not agglomerate due to the effect of surface tension when placed in water, the larger particles also make the dissolution rate of polyacrylamide in water slower. The dissolution rate of the polyacrylamide is relatively slow. In order to prepare the polyacrylamide aqueous solution in the coal washing water treatment, a relatively large polyacrylamide dissolution equipment is required. If the polyacrylamide is not dissolved well, the swollen polyacrylamide will be lost with the coal washing water, not only The expensive polyacrylamide is wasted in vain, and the viscous colloidal polyacrylamide after swelling also makes it difficult to filter the separated suspended matter; moreover, polyacrylamide particles are easy to absorb moisture in the air, and the moisture-absorbing The fluidity of polyacrylamide is not good, which affects the addition and metering in production. In order to keep the polyacrylamide particles dry, there must be equipment for applying dry air to the polyacrylamide particles

In order to fully dissolve polyacrylamide and keep polyacrylamide particles dry, the investment in coal washing water treatment equipment is relatively large.