DE2735030A1 - PROCESS FOR CURING HALF COK BRIQUETTES - Google Patents

Description

', experienced for hardening half-coca brlketta

DLo lirfLriduu £ concerns dan hardening of briquettes which auü Elalbkoka and a binder, for example Tar, were obtained without the need to use the previously known devices, the one require considerable floor space and lead to a high proportion of breakage in the case of multi-layer stacking step.

In the usual method, the briquettes are hardened by never heating them up to a temperature of about 20O ⁰ G in the presence of an oxidizing atmosphere. Under these conditions, the oxygen causes a copolymerization of the binding agent (usually tar) with the semi-coked material and the baking effect of this temperature leads to a uniform briquette in which the carbon provided by the semi-coked M * w torially and the permanent binding agent provided carbon for all practical purposes are indistinguishable.

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For hardening, the "green" briquettes, stacked in a layer 30-50 cm high, are placed on a moving grate or on suitable scaffolding, which move through a tunnel oven kept ^{at a temperature of about 20O 0 C;} inside the furnace, the briquettes are lapped by a stream of grass containing 5-18 volumes of oxygen. Apart from the limitation on the layer height, this technique has several other disadvantages. First of all, the system components are expensive and the rate of wear is extremely high; second, such a plant has only a limited production capacity and requires a considerable amount of space. The total time required to complete the treatment is approximately two hours (or more), depending on the size of the briquettes.

The problem of hardening the briquettes led to working with tunnel ovens or ovens with moving grates in which the briquettes were ^{heated to 20O 0} G and held at that temperature in the presence of a stream of air for two hours or more without being subjected to stress or the possibility of wear and tear that would have led to a higher fraction.

According to the invention, the existing limitations with regard to the height of the briquette bed are to be removed.

In particular, the invention relates to a method of hardening briquettes which is characterized in that it is carried out in a furnace of the vertical type. Unexpected _f physico-chemical conditions were found under which the briquettes

709886/0916

do not suffer any mechanical degradation or disintegration if they bear the weight of the layers of others above them Briquettes are exposed.

The invention, which avoids the limitations on the briquette height, is based on the knowledge that "green" briquettes made from semi-coke and tar (ice binding agent) can be cured in a vertical furnace without risk of breakage, provided that after after being stacked in the oven they have undergone a previous heat treatment be exposed in a substantially inert atmosphere.

It has been shown nämlicn that when the deformable kneadable or "green" briquettes are heated to temperatures between 300 and 4oC ⁰ S, it discloses tough and up to the point where they are from: after oven. between 35 and 150 minutes without damage, even if they are still hot. can.

The bus-carried briquettes can then be subjected to suitable, standardized high-temperature baking treatments depending on the usage.

The lemperaturgrenzen above are critical ijbei one tet at temperatures below 300 ⁰ C, so is found that the briquettes bulged with an appropriate binder removal effect on the iSolttrtkekBrger. At temperatures above 400 ^° C., the energy consumption increases without better results compared with those according to the invention.

709886/0916

BATH ORIGINAL

COPY

-Jr- S

The following examples illustrate the invention without it to limit.

A use of "green" briquettes was prepared by char and tar were mixed for 15 minutes at 100 ⁰ C. The briquettes containing 85 weight semi-coke and 15 weight tar with the dimensions 36x4-2x25 mm were then hardened according to the method according to the invention. The briquettes were used in a shaft furnace, which was heated to 36O ⁰ C and held bei'diesen temperatures for 75 minutes (in nitrogen atmosphere). The briquettes were then removed from the shaft furnace and exposed to the baking process. It turned out that the briquettes had the following characteristics:

Apparent density Actual density Porosity
Bulk density
Compressive strength

MICUM test (registered trademark)

1.11 g / cm ⁵ 1.86 g / cm ⁵ 40.32 % 620 kg / m ⁵ 200 kg / briquette

M _9n = 86.6 # M

10

= 10.2 56

The briquettes were then treated according to standard procedures depending on the intended use.

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COP *

Claims (3)

Method for hardening semi-coconut briquette: PATJstiTAllSHiÜ'JTlL · 1. A method for the hardening of semi-coke briquettes "which tar as binders, characterized in that the briquette in a vertical furnace at a temperature of 300-400 ⁰ G is behondelt over a period between 35 and 100 TUnuten. 2. The method according to Anijetzt ', thereby -ekerm'iei.chnet, that the "Rehondlunr; in i * n \ ref! ontli? hen inert atmosphere carried out v / ird. 3. Process for hardening Hnlbkoko-Firitketta, the Tar as a binder contained in a vertical furnace, as described. 709886/0916 ORIGINAL INSPECTED