Complete solid-liquid separation technology in production of humic acid product

[0019] Example 1

[0020] The raw material used is the deeply weathered anthracite coal in Jincheng, Shanxi. After the extraction reaction, the obtained suspension of the residue below 60 mesh and the mother liquor is sieved and then filtered.

[0021] The horizontal centrifugal dewatering screen is selected, and three are used in series, and the screen fineness is 80 mesh, 120 mesh, and 200 mesh respectively. The granular residues of three particle size groups of 60 to 80 mesh, 80 to 120 mesh, and 120 to 200 mesh can be separated respectively. The residues are washed with hot water before being discharged from the sieve, and a considerable amount of humic acid is recovered. The washing water of humic acid is sent to the reactor to extract the weathered coal raw material (one of the outstanding advantages of this scheme). After centrifugal dewatering, there is a suspension with a particle size finer than 200 mesh and the residue mixed with the mother liquor. Choose a horizontal centr

[0022] Example 2

[0023] The treatment object is the same as in Example 1. The suspension mixed with the residue below 60 mesh and the mother liquor is treated, first sieved and then filtered.

[0024] The sieve is a self-designed combined sieve, which is composed of a cylindrical sieve with the same length and different diameters and a collection bucket sleeved together. The screen axis is placed vertically, and the cylindrical screen has at least one layer, where there are three layers, with diameters of 1 meter, 1.5 meters, and 2 meters from the inside to the outside. The outer diameter of the collection bucket is 2.5 meters, which covers the entire screen. The upper part can be opened and the lower part must be sealed. The bottom surface is connected with the bottom of the three-layer cylindrical screen. The space in the collection bucket is divided into four parts, and the collection is 60 to 80 meshes. , 80 to 120 mesh, 120 to 200 mesh three particle size groups of granular re

[0027] Example 3

[0028] The treatment object is the same as in Example 1. The suspension mixed with the residue below 60 mesh and the mother liquor is treated, first sieved and then filtered.

[0029] The suspension is pumped into the polyurethane cyclone (particle size separation type) with a mud pump to separate the larger particles of residue from the bottom stream, and the top stream product is a suspension of the residue and mother liquor mixed together. The remaining treatments are the same as in Example 2.