SU833687A1 - Raw mixture for producing cement clinker - Google Patents

Description

(54) RAW MATERIAL MIXTURES TO RECEIVE CEMENT: TO LINKER

one

The invention relates to industrial construction materials, and more specifically to the production of adhesives, and can be used to obtain cement clinker at the stage of preparation of the raw mix.

The known raw material mixture for the production of cement clinker, including carbonate, aluminosilicate and iron-containing components is G Most; close to the invention by the technical essence and attainable effect is, the raw mixture comprising ct, bonatny, silica-alumina, iron-containing additive components and lignosulfonatsoderzhashuyu {2.Nedostatkom known syrevgh mixtures comprising lignosulfonatsoderzhaschuyu additive is that they are somewhat reducing the moisture content of the sludge (by 2–5%) and improving its transportability, do not provide a noticeable increase in the efficiency of the dedusting of waste gases in the furnace electrostatic precipitators. Dust removal into the atmosphere does not comply with sanitary standards for the maximum permissible concentration of non-toxic non-organic dust (this includes dust extracted from rotary clinker-burning kilns) in the air atmosphere of cement plants.

The goal of nzofeteny is to increase the efficiency of dedusting in the electrostatic filters of the exhaust gases of cementing rotary kiln furnaces.

The goal is achieved there that the raw mix, which includes carbonate, aluminum silicate and jalazo-containing components, as well as lignosulfonate-containing additives, as a matter of fact, contains ammonium lignosulfonates at the following components ratio, wt.%:

Carbsgate component 73-88,1

Alumina ssatny component11 .0-23,0

Iron-containing kompszheng8, O-5.0

Ammonium lignosulfonages OD -2.0 The additive to the main components of the raw material mixture in the form of ammonium lngosulfonates is contained in waste products of bitter pulp and paper mills (Turin and Balashikha pulp and paper mill).

The characteristics of industrial wastes based on ammonium lignosulfonates are presented in Table. one.

Lignosul; phonates of ammonium have no less effective dilution effect on raw sludges than lignosulfates of Ca, K, N a, etc. However, unlike the latter, they also contribute to a significant increase in its effect. Precipitations of precipitation in electrostatic precipitators of dust carried away by flue gases from rotary kiln furnaces, as ammonium transosulfonates introduced into the raw material are already sublimated in the relatively cold section of the furnace (with a gas temperature of up to 300 4 ° C) and contribute to reducing the specific electrical resistance of the furnace deposited on the collecting electrodes of the electrostatic precipitator.

The electrical resistance of dust is determined mainly by the area of the contacts and the processes of capillary condensation in the gaps between the particles. The condensed liquid between the dust particles creates an additional path for the passage of electric current through the dust layer in the high voltage zone. The resistance of a capillary condensed liquid decreases when the MN group ions from a solid or gas phase dissolve in it, which causes an increase in conductivity Ammonium 1.20-1.24 5O 0.9-1.8

(i.e., reduction of electrical resistance) of a layer of particles and an increase in the efficiency of cleaning exhaust furnace gases, in particular cement production, in baking electrostatic precipitators.

Example, Prepare a raw mix. Each of them contains carbonate, aluminosilicate and iron-containing components.

Raw materials 1, in addition to these basic components, contains calcium igonosulfonates. Mixtures 2-6 consist of the main components and as an additive they contain ammonium lignosulfonates with extreme extreme and average amounts of the added additive, namely 0.1; 2, O and 1.0%. All raw mixes are crushed to the same fineness and ground in a kiln.

In tab. 2 The compositions of mixtures of gases, the humidity of sfievy sludges and the efficiency of sedimentation in the electrostatic precipitator of the dust contained in the waste furnace gases of the burning of these raw mixtures are given.

From the table it can be seen that the introduction of ammonium lignosulfonates into the syfiev mixture of SPO contributes to a decrease in the moisture of the sludge by 2-3.3% and an increase in the efficiency of precipitating the DUST in the electrostatic precipitator by 4.5-14.5%, which leads to a reduction in fuel consumption for burning. by 5-7% with the same furnace capacity return of collected dust to production and reduction of environmental damage caused by dust emissions into the atmosphere.

The annual economic effect from the use of ammonium lignosulphate in the feed mixture in the industry is 15O-22C) thousand rubles, for one rotating clinker-burning furnace of average power.

Table 1

 4.5 2.4-3.8. 6.0-7.8

Claims (2)

1. Bunit Yu.M., Cement Technologists and Others in Moscow, 1964, p. 141145 ... 2.Timashev V.V., Sulimenko L.M. Dilution of cement slurries. L1., VNIIESM, 1978 (prototype).