SU1472483A1 - Coke coating composition - Google Patents

Abstract

The invention relates to the coke industry, in particular, to coating compositions for coke to reduce its reactivity, protect it from destruction and prevent dusting during transportation. The goal is to reduce the reactivity of coke. The coating composition consists of coal flotation waste and a dispersion of a styrene-butadiene copolymer. 3 tab.

Description

The invention relates to compositions used to coat metallurgical coke to reduce reactivity, protect it from destruction and prevent dips during transportation, and can be used in the coking industry.

The purpose of the invention is to reduce the reactivity and abrasion of coke.

The following components are used to prepare a styrene-butadiene copolymer; butadiene-1,3 (di-vinyl) mol. mass 54.09 (OST 38-3-71) in liquid form; styrene (vinylbenzene) mol, mass 104.14 in the form of a liquid (GOST 10003-76); potassium soap of disproportionating rosin (TU-38-103261-75), sulfanol (TU 6-01-1043-75) or synthetic fatty acid fractions, (, (OST 38-7-25-73) .

Waste flotation coal - suspension. particulate matter in water. Solid phase of waste has the following mineralogical composition, wt.%:

Clayey substance 41,4-92,0

Coal substance2,1-16,5

Pyrite0,8-12,0

Carbonate1,1-19,1

The predominant minerals of the clayey material are kaolinite and hydromica of a silty type. The chemical composition of the waste ash solid phase: represented by the following oxides: FeO, (5.6-16.4%); AliOj (14 ,,; SiOi (33.6-52.6%); CaO (1.9-6.2); MgO (1.7-4.0%); SOj (0.6-3.3 %)

Example: The following components are loaded into the polymerization apparatus: first, a surfactant with water, then styrene, and butadiene last. The polymerization process is completed at 100% conversion of butadiene and styrene. The resulting product is cooled

cl

i (m

to

4: 2

00

oo

in the same apparatus to ZO-SO C and unloaded.

To obtain the composition, the flotation coal from the coal preparation plant of the Yasinovsky coke-chemical plant uses ash content of 62% and a particle content from 0.06 mm to 70%. Flotation waste is introduced in the form of pulp with a content of solid 60 g / l; readout the fractional part of this component in the composition of the solid phase (but may be with a solid content up to 300 kg / m).

To prepare the coating composition, a suspension of coal flotation waste in the amount of 1 is introduced into the copolymer with a molecular weight of (3-4) -10 in the form of a 40% aqueous dispersion; 2; : 3.5% by weight, calculated on a solid, and mixed for t minutes at a stirring rate of 3000 rpm.

The coating is applied by immersing heated coke (at 200 -25-250 ° C) in the prepared suspension of the coating composition (possibly coating deposition by spraying). Drying of the coating is done in air. The thickness of the coating film on the coke is about 3-5 µm, the weight gain is 100-150 g per tonne of coke after the coating has been coated at 40% concentration.

The coke reactivity is determined by the degree (rate) of gasification. The technique provides for testing bulk commercial coke.

without prior crushing, and the calculation of the rate of gasification of coke is made according to the formula: 40

K - | --- 100% / min,.

n - where K is the reaction rate constant;

one

cations;

initial sample weight; gasification time. For the sake of consistency, the rate of gasification of uncoated coke is assumed to be 100% and a recalculation of the increase in reactivity in relative percentages has been made.

Table 1 presents the recipe for the syn thesis of the styrene-butadiene copolymer, (in May, 4. May, for 100 May. Of the monomers),

In tab. Figures 2 and 3 present the proposed composition for the coating and characteristics of the coating of the proposed composition (gasification and strength) of the molded and layered coke, respectively, in comparison with the known coating and with uncoated coke.

As follows from the data table. 2 and 3, the proposed composition of the coating ensures a reduction in the reactivity of the coated coke to l, 30% compared with the coating of the known composition. This is due to the fact that coal flotation wastes containing clay. The soil is good in the wafer, finely dispersed, and therefore envelop the surface of the coke with a thin layer, not its ash, and easily fill small cracks. At the same time, no extraneous harmful substances are introduced into the coke (flotation waste — a more ash constituent part of the fossil coal),

The particles of coal flotation waste are the filler of the polymer coating. All this results in a solid, uniform coating on the coke surface that closes the pores and prevents the coke from breaking, and the presence of an inert filler also reduces the reactivity of the coke.

The use of coal flotation waste allows us to solve an environmental problem.

Claims (1)

Invention Formula A coke coating composition based on a dispersion of a styrene-butadiene copolymer, characterized in that, in order to reduce the reaction - mass loss during the gasification capacity and the abrasion ability of the cook. . , .TV J4 .TWV m hch. pt TT g 1 TT U: Gili PP 50 Sa, it additionally contains coal flotation waste at the following ratio of components, wt,%: Coal flotation waste Dispersion of styrene-butadiene copolymer 1.0-3.5 Rest, Table 1 presents the recipe for the syn thesis of the styrene-butadiene copolymer, (in May, 4. May, for 100 May. Of the monomers), In tab. Figures 2 and 3 present the proposed composition for coating and the characteristics of the molded and layer coke coated with the proposed composition (gasification and strength), respectively, in comparison with the known coating and with uncoated coke. As follows from the data table. 2 and 3, the proposed composition of the coating reduces the reactivity of the coated coke to l, 30% compared with the coating of the known composition. This is due to the fact that flotation waste coal containing clay. The soil is good in the wafer, finely dispersed, and therefore envelop the surface of the coke with a thin layer, not its ash, and easily fill small cracks. At the same time, no extraneous harmful substances are introduced into the coke (flotation waste - a more ash component is part of fossil coal) The particles of coal flotation waste are the filler of the polymer coating. All this results in a solid, uniform coating on the coke surface that closes the pores and prevents the coke from breaking, and the presence of an inert filler also reduces the reactivity of the coke. The use of coal flotation waste allows us to solve an environmental problem. Invention Formula A coke coating composition based on a dispersion of a styrene-butadiene copolymer, characterized in that, in order to reduce the reactivity and abrasion of the coc. , .TV J4 .TWV m hch. pt TT g 1 TT U: Gili PP Sa, it additionally contains waste flotation of coal in the following ratio of components, wt,%: Waste flotation coal Dispersion of styrene-butadiene copolymer 1.0-3.5 Rest, 14724836 Table 1 Butadiene + styrene Potassium di-PrPROPROSTIONIROVYAN-NOY rosin Water Note. The resulting composition can be stored for 6 weeks. and has a pH of 9-11, optimal for treating the surface of coke. To increase the shelf life, Trilon-R can be added to this formulation in an amount of 0.05% by weight of copolymers, I Table 100 5-10 125 Table3