JPS5849482B2 - Solidification method of carbon material powder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for solidifying carbon material powder, and more particularly to a method for solidifying carbon material powder, in which carbon material powder is solidified using a binder made of Bortland cement and gypsum.

When producing calcium carbide, carbon materials and quicklime are supplied to an electric furnace and reacted using the resistance heat generated between the electrode and the bottom of the furnace. It is necessary to remove the powder from the furnace, but if these raw materials are powder, the carbon monoxide will not be discharged smoothly, causing blow-up and disturbing the furnace condition, so the raw materials should be sieved to avoid powder as much as possible. I am using the separated one.

However, generally, high-quality carbon materials with low ash and volatile content are used as raw materials for calcium carbide, so there is a need to solidify this fine powder carbon material and use it as a raw material for calcium carbide. Conventionally, various methods have been proposed for turning powdery carbon materials into aggregates or nodules.

For example, there is a method of granulating using a rotary granulator using pitch, tar, polyvinyl alcohol, methyl cellulose, blackstrap molasses, etc. as a binder, and a method of compression molding using a briquette molding machine.

However, the strength of the granulated coal obtained with the former is low, and most of it breaks during transportation or use, making it unusable as granulated coal.The latter has excellent strength, but the binder is expensive. However, it also has disadvantages such as being uneconomical as it requires dog-shaped equipment.

The purpose of the present invention is to solve these drawbacks.The present invention aims to solidify the carbon material powder by bonding the carbon material powder using the coagulation force of a specific hydraulic inorganic binder. The present invention aims to provide a method for solidifying carbon materials that has high initial strength and excellent fracture strength at high temperatures.

That is, the present invention uses carbon materials with a particle size of 6 or less, 70 to 90
30 to 10 by weight and a binder in which the ratio of Bortland cement to gypsum is 50 to 90:50 to 10 by weight %
15 to 15 parts by weight of water to ioo parts by weight of the mixture consisting of % by weight.
It is characterized by adding 25 parts by weight and stirring.

The present invention will be explained in more detail below.

The present invention requires the use of a binder consisting of Boltland cement and gypsum as a binder for the carbon material powder, but the carbon material powder used in the present invention may be made of coal, coke, graphite, etc. 6m or less, and 6m or less
If it exceeds the limit, it will not mix well with the binder, and it will not be possible to obtain strong granulated charcoal.

Generally, hydraulic inorganic binders include boltland cement, alumina cement, gypsum hemihydrate, and 2CaO-
Mine slag has hydraulic components such as SiO2 and 3CaO/SiO2.

Any of these can be used in the present invention, but in particular, in the present invention, one consisting of 50 to 90% by weight of Boltland cement and 50 to 10% by weight of semi-hydrated or anhydrous gypsum has a bonding strength of 50% to 10% by weight. Moreover, since the coagulation time is short, it has the advantage of not collapsing during hasiding.

Next, the ratio of carbon material powder and binder is 70% of carbon material powder.
30 to 10% by weight of the binder is suitable for 90% by weight; if the binder is less than 10% by weight, it is difficult to sufficiently bind the carbon material, and high strength granulated coal cannot be obtained. On the other hand, if it exceeds 30% by weight, agglomeration will be severe, large lumps will be produced, and the carbon material component will be substantially reduced, which is not preferable.

These mixtures can be easily performed using a commercially available mixer or the like, and are simple as it is only necessary to add water to the mixture.

In the present invention, the amount of water to be added is 15 to 25 parts by weight per 100 parts by weight of this mixture, mixed for about 5 minutes with a mixer, then drained, placed in an appropriate place, and placed in Eiwa. Harden and cure.

In this case, the amount of water used is important; if it is less than 15% by weight, it will not be cured sufficiently, and if it exceeds 25% by weight, the strength will be low and it will take time to dry, so use an appropriate amount of water. There is a need.

Since it is affected by the particle size of the carbon material used and the amount of binder, it is necessary to determine the conditions in advance and carefully manage them so that the appropriate amount of water is used.

In addition, when hydrating and curing to form aggregates and nodules, if necessary, moderate agitation can prevent local agglomeration and facilitate drying.

The agglomerated coal obtained by the present invention varies somewhat depending on the raw material, the particle size of the carbon material, etc., but the particle size is 5 to 70 ml1! A certain amount of aggregates or clumps, and a special drying method is used>. Even if the material is left to dry naturally, such as by drying in the sun, the moisture content will be reduced to 4 to 5% or less in about 3 to 4 days.

In addition, its crushing strength is 120 to 200 kg
/crj. It is.

As explained above, the present invention is a method for solidifying carbon material powder by mixing and stirring a specific amount of carbon material powder, a binder, and water. (2) There is no need to use special equipment, and the cost is low because a G3 bonding agent is used. (4) ) It has the advantage of being usable as a raw material for producing calcium carbide.

Example particle size 5. 77 parts by weight of coke below Qim, binder 2 with a ratio of Boltland cement and trihydrate gypsum of 8:2
3 parts by weight were thoroughly mixed in a dish granulator, 23 parts by weight of water was added thereto, and the mixture was further mixed for 5 minutes.

The contents were then removed from the granulator and dried in the sun for 24 hours.

Its physical properties were measured. For comparison, 10% by weight of pitztar was added to the carbon material and granulated using a dish-type granulator.

Their physical properties are shown in Tables 1 to 3.

The product of the present invention and quicklime were mixed as carbon materials in the required number of moles, and the mixture was supplied to an electric furnace for calcium carbide to produce calcium carbide.

As a result, the cubic size of calcium carbide is 300-310
l/kg, electric power consumption, s. It was IKwD/I.

Claims (1)

[Claims] 1 Carbon material powder with a particle size of 6 mm or less 70 to 90% by weight and the ratio of Bortland cement and gypsum to 50 to 90% by weight
90: A method for solidifying carbon material powder, which comprises adding 15 to 25 parts by weight of water to 100 parts by weight of a mixture consisting of 30 to 10% by weight of a binder of 50 to 10 and stirring the mixture.