RO106577B1 - Process transformation of carbon black - Google Patents

Abstract

The invention relates to a process for the transformation of wet, black sludge smoke, resulting in the manufacture of acetylene, by oxidation partial or electrocracking of methane gas various humidities, about 40-70% when used rotary vacuum filters, or decantation (gravity or centrifugal) in a fuel emulsion, with various uses in the material industry construction, as auxiliary fuel, industry energette steam boilers, in the domestic, agricultural. Thus, mix the black slats of smoke, abovementioned, single or mixed, in 60-95% (by weight) with hydrocarbons heavy (viscous liquids), fuel oil, diesel fuel worn with acetylenic polymers, coke pitch or oil, creosote oil, etc. (simple or in mixture) in a proportion of 5 to 40% (by weight) after which follows the mixing of the obtained mixture, time from 6 minutes to 2 hours, until total emulsification, ie its transformation into a homogeneous product stable, fuel

Description

ι

The invention relates to a process for transforming wet flames. black smoke. results at the acetylene factory, by partial oxidation, respectively the electrocracking of methane gas and other industrial pyrolytic processes, in a stable, combustible emulsion, with uses in the sectors: industrial, domestic and agricultural.

As is known from the wet slime, the black of smoke, resulted in the manufacture of acetylene. by partial oxidation, respectively the electrocracking of methane gas and other industrial pyrolytic processes (from water-cooling operations of pyrolysis gas, of carbon black. followed by decanting, filtration of suspensions) with humidities of about 85% (80 ... 90%). in the case of the use of rotary filters with vacuum or decantation (gravitational or centrifugal), respectively 40-70%, in case of using press filters (in these cases, the advantage of reducing humidity is offset by the disadvantages of discontinuous operation, reduced productivity, respectively consumption, higher costs ).

The high humidities from the black smoke sludge make these materials, industrial wastes with no energy value (the lower calorific value of the sludge, of the black smoke, with 85% humidity and ash 0.46% is about 664 Kcal / kg respectively 2780 KJ / kg), but with a high potential for environmental pollution, for the destruction of which is incinerated, in rotary kilns, pits, battles, with high fuel consumption, reduced efficiency (part of the uncinerated material polluting the surrounding areas), difficulties that often lead to abandoning the practice of incineration with even more negative effects on the environment

The classic drying of these slabs, although it leads to an increase in the lower caloric power. is generally associated with the phenomenon of pollution, for which costly installations are needed to combat it.

Also, the transport and transport of the black smoke dust, resulted by drying, are associated with the phenomenon of pollution, due to the specific difficulties, related to the low volumetric weight (about 100 ... 350 kg / m ³ ), the fine granulation (about 50— 350), as well as its very high pollution capacity (1 gram of dry black smoke pollutes, it grates about 8m surface).

All this together with the impurities (ash to about 1-5%) and the incorporated hydrocarbons and acylethylene polymers (about 5 to 15 volatile anhydrous), which exclude the use of dry black smoke in the rubber and paint industry, make the dust dry. smoke black, also an industrial waste, unusable, with a high capacity of pollution, for the destruction of which is often resorted to incineration in pits, battles, after a previous spray with liquid fuels.

Processes for the transformation of wet, black sludge are known. in combustible, non-polluting carbonaceous materials for various uses, such as the processes described in patent DE no. 2510876 and FR patent no. 2393841, but which presents the disadvantage of the complexity, through the succession of drying operations - mixing with pitch. molten bitumen - briquetting - coking, carried out in complex installations, consuming energy and pollutants.

The process according to the invention removes the above disadvantages by the fact that, for the purpose of transforming the wet slurry, the carbon black. in a stable, combustible emulsion. 60-95% by weight of wet slime, black of smoke. having a humidity between 40 ... 85% it mixes with

5 ... 40% by weight of simple or mixed heavy hydrocarbons, after which the mixture is kneaded, for 6 min to 2 h until the total emulsification and obtaining a homogeneous and stable combustible product, having a moisture content between 30 ... 70%. The heavy hydrocarbons used, single or in combination, can be chosen from fuel oil, spent diesel sludge with acetylene polymers, coke tar, petroleum or creozo oil.

The process according to the invention has the following advantages:

- transforms the wet slime, black of smoke, resulting in the manufacture of acetylene by partial oxidation or electrocracking of methane gas, into a combustible, stable emulsion, with uses in: the building materials industry, as an auxiliary bust horn for the manufacture of bricks, tiles, at rotary burner clinker ovens in the cement industry, rotary blast furnaces, energy industry, as auxiliary fuel to boilers alongside other fuels for steam or hot water production, household, agricultural, small industry, law, fuel for heating homes, schools, bread factories, seed dryers, greenhouses, etc., incineration plants (for environmental protection);

- removes the pollutant character of the black carbon dust, resulting in the surface drying of the sludge by the fact that it binds, fixes the dry black carbon particles.

The following is an example of embodiment of the invention.

It mixes 80% slurry of carbon black with humidity 85%, representing a polluting and unusable industrial waste, resulting in the manufacture of acetylene by partial oxidation or electrocracking of methane gas by filtration on rotary filters with vacuum or decantation (gravitational or centrifugal) with 20% spent diesel sludge with low humidity acetylene polymers, maximum 5 ... 10% (representing another industrial waste resulting from acetylene manufacture) or 20% simple or mixed viscous fuel, depending on availability, depending on availability.

It is followed by mixing the mixture until it is completely emulsified, that is to say, its transformation into a homogeneous and stable product.

The energy value of the product obtained as a stable fuel emulsion is a function of the proportion between the components that determine the moisture content, ash and fuel mass as well as the elementary analysis of the fuel mass.

For the example given at a moisture content of 67.63% and ash of 0.57%, a lower caloric power of about 2774 cal / kg respectively 11,614 KJ / kg.

Claims (2)

claims 1. Process for converting wet slime, from carbon black, into a combustible, stable emulsion, characterized by the fact that 60 ... 95% by weight of wet slurry, of carbon black, having a humidity between 4 O. .85%, is mixed with 5 ... 40% by weight of heavy hydrocarbons, single or in mixture, after which the mixture formed is kneaded for a period of 6 min - 2 h until the total emulsification and obtaining a homogeneous fuel product and stable, with a moisture content between 30 ... 70%. Process according to Claim 1, characterized in that the heavy hydrocarbons are selected from fuel oil, slurry used diesel with acetylene polymers, coke cans, oil or creosote oil and are used singly or in combination.