SU546646A1 - The method of obtaining granulated carbon from lignin - Google Patents

Description

one

The invention relates to methods for producing granular coals from carbon-containing materials and can be used in the production of raw coal for the carbon disulfide industry, as well as in the production of activated carbons.

A known method for producing granulated carbon from carbon-containing materials, such as lignin, includes screening of coarse fractions, dehydration to a residual moisture content of 50-55%, plasticization and granulation, drying and carbonization of granules, screening of the finished product.

This method is coupled with the formation of waste (10-15%) at the stage of screening out the feedstock, which reduces the yield of the finished product, which is no more than 30% relative to the weight of the initial (dry) lignin. The coal obtained by this method has low strength.

A method of producing granulated carbon from lignin is known, including the separation of particles larger than 7-10 mm, dewatering, pressing, drying the granules, carbonizing them at 350-500 ° C and outputting the finished product.

This method has the following disadvantages: the need to use expensive equipment, incomplete use of raw materials, a significant amount of waste generated during the screening of the finished product

and NS have a qualified user. These shortcomings significantly increase the cost of the finished product.

In order to increase the yield of the finished product and increase its mechanical strength according to the proposed method, dehydration of ligiin is carried out to a residual moisture content of 58-62% and before pressing it is added to powdered carbonized carbon with a particle size of 60-100 microns in accordance with: lignin - 95 - 85%, powdered coal 15-5%. Powdered coal is produced by carbonization at 350-500 ° C

the original lignin with a particle size of more than 7-10 mm and grinding to 60-100 microns. Powdered coal can be obtained by grinding to 60-100 microns of the non-conditioned product.

Example 1. Initial lignin with a humidity of 70% is sifted out on a vibrating screen through a sieve with a cell size of UHY mm.

Waste from sieving - particles larger than 10 mm are carbonized in a rotating furnace

cool. The carbonized coal obtained and the unconditioned part of the finished product are ground to a grinding fineness of 60-100 microns in a ball mill. Dissolved lignin is dried in a wrap1, auscitant with a drum dryer at 115 ° C to a residual moisture content of 60% and mixed in a paddle mixer for 20 minutes with 10% ground carbonized coal. The resulting mass is granulated on a press press through dies with a hole diameter of 16 mm. The granules are carbonized in a rotary kiln with

external heating iri 450 ° C and the rate of temperature rise 10 ° C / mission. Carboniferous granules are sifted out from shreds and dust, which are used for grinding.

The finished product is characterized by the indicators given in table. one.

Table 1

Example 2. Original lignin with a humidity of 70% is sifted out on a vibrating screen with a cell size of 7X7. Waste from sieving - particles larger than 7 mm are carbonized at 450 ° C in a rotary carbonization furnace, then cooled. The obtained carbonized coal and the non-conforming part of the finished product are ground in a balloon mill to a grinding tonium of 60-100 microns.

The separated lignin is dried in a drum rotary dryer at 115 ° C to a residual moisture content of 60% and mixed in a lobe. In this way, when the deviation is outside the input amount of carbonized coal, namely less than 5% and more than 15%, the strength and yield of the finished product are reduced.

Carbonized grains are further subjected to vapor-gas activation at 850–900 ° C and receive active carbon having

mixer for 20 minutes with 10% crushed coal. The resulting mass is granulated on a screw press through dies with a 2.3 mm hole diameter. The granules are dried in a rotary drum dryer at 115 ° C to a residual moisture content of not more than 5%. Dry granules are carboxylated at 450 ° C. Carbonated grayoules are sifted from the sand.

and chips, which are directed to grinding.

The carbonized granules are characterized by the indicators given in table. 2

table 2

Ways

the strength according to GOST 16188-70 is 82.3%, the bulk density according to GOST 16190-70 is 447 g / l, the total porosity in water is 0.84, the dynamic activity in pairs of benzene is 135 g / l.

Claims (1)

The proposed method has a number of advantages over known methods; 5 1. Reducing the cost of pre-dewatering, since the dewatering is carried out to a residual moisture content of 58-62% instead of 50-55% 2. The yield of finished product5 increases relative to the starting material. 3. The strength of the granules is measured. 4. Full use of raw materials is ensured (98%), no waste is generated in the production process. Y 5. The cost of the finished product according to the proposed method is reduced by 10-12% compared to the cost of the product obtained by a known method. The method of obtaining granulated carbon from lignin, including the separation of particles larger than 7-10 mm, dehydration, pressing, drying the granules, carbonizing them at 350-500 ° C, and outputting the finished product, characterized in that Its mechanical strength, dehydration of lignin is carried out to a residual moisture content of 58-62%, and before pressing, 5-15% carbonated carbon with a particle size of 60-100 µm is added to it relative to the weight of the mixture.