JPS59179697A - Preparation of aqueous slurry of carbon-containing composition - Google Patents

Abstract

PURPOSE:To prepare the titled aqueous slurry causing no scattering or explosion of dust and having excellent fluidity, by adding water and an additive to a carbon-containing composition with special properties. CONSTITUTION:Water and when necessary, 0.01-5wt% additive (e.g. salt of fatty oil sulfate) are added to a carbon-containing composition consisting mainly of petroleum coke, coal, heavy oil, etc. and having a carbon content of 82- 98wt% (water and mineral oil-free basis), a hydrogen atom/carbon atom ratio of 0.001-0.10 (water and mineral oil-free basis), an adsorbed water content of 0.1- 6wt% and a specific surface area of 0.01-7g/m<2>. The mixture is crushed to obtain an aqueous slurry having such a particle size distribution that particles of 200 mesh or smaller accout for 40-90wt%, a carbon-containing composition concentration of 70wt% or highr and a viscosity of below 1,000cP (25 deg.C).

Description

[Detailed description of the invention] The uninvented invention is petroleum coke, heavy oil,
The present invention relates to a method for producing a water slurry using various carbon-containing compositions such as deasphalted asphalt and coal.

In recent years, due to the instability of petroleum supply, technological development has been progressing to effectively utilize various carbon-containing compositions such as petroleum coke, heavy oil, deasphalted asphalt, and coal. For example, there are various technologies for effectively utilizing petroleum coke, heavy oil, deasphalted asphalt, coal, etc., such as pyrolysis, gasification, combustion, alternative fuels for blast furnace injection heavy oil in the steel industry, and alternative fuels for heavy oil in cement kilns. is possible. However, in these various utilization technologies, carbon-containing compositions are difficult to handle because they are solid at room temperature, and there are disadvantages such as the risk of pollution due to dust scattering and the risk of dust explosions, making it difficult to use carbon-containing compositions. It has become. Therefore, it is desirable to make such carbon-containing compositions into fluids to facilitate handling and prevent pollution and danger.

On the other hand, in order to reduce the transportation cost of carbon-containing compositions,
It is effective to transport it as a fluid.

In order to obtain a more suitable solution (k+), an effective method for fluidizing a carbon-containing composition is to form it into a slurry. A higher concentration is preferable for use as a fuel for cement kilns.

Furthermore, in order to increase transport efficiency, it is desirable that the concentration is high. That is, the concentration is 70% by weight or more on a moisture-free basis,
A slurry is required to have a viscosity of about 1000 cp or less at 25°C, and a slurry with such properties must be manufactured.

In view of the above-mentioned points, the inventors conducted intensive research on a method of fluidizing carbon-containing compositions, and found that for carbon-containing compositions that fall within a certain property range, the concentration of the carbon-containing composition is 70% by weight. The present inventors have discovered a method for producing an aqueous slurry composition that is highly fluid and does not cause dust scattering or dust drying, and has completed the present invention.

In other words, the carbon content is 82 to 98 on a moisture-free and mineral-free basis.
The ratio of the number of oxygen atoms/the number of carbon atoms on a weight%, moisture-free, mineral-free basis is 0001 to 010, and the adsorbed moisture is 0.01.
~6% by weight of the carbon-containing composition having a specific surface area of 0.0-1 to 72 I/1, and optionally water and preferably 0.01 to 5% by weight of the carbon-containing composition. 01 to 1.5% by weight of additives are added, the particle size of the composition is adjusted to 40 to 90% by weight below 200 mesh, preferably 50 to 80% by weight below 200 mesh, and the carbon-containing composition concentration is 70% by weight. In the above manner, a highly fluid slurry having a viscosity of about 1000 cp (25° C.) or less is produced. It is preferable to check the properties of the carbon-containing composition by the method shown in Table 1, but other methods may be used.

(The following is a blank space) Table 1 In other words, the method of the present invention involves adding water and additives as necessary to a carbon-containing composition such as petroleum coke, heavy oil, deasphalted asphalt, and coal to produce sludge IJ+. Hit 9, carbon content on moisture-free and mineral-free basis is 82 to 98% by weight, ratio of oxygen atoms / carbon atoms on moisture-free and mineral-free basis is 0001 to 0, 10, adsorbed moisture is 0 The particle size of the carbon-containing composition having the properties of .01 to 6% by weight and a specific surface area of 0.01 to 7 mf/g is 200 mesh or less, 40 to 90.
The slurry is characterized in that the carbon-containing composition concentration is adjusted to % by weight, and water and additives are added as necessary to produce a slurry having a carbon-containing composition concentration of 70 monomers or more.

The drawings show the results of experiments conducted by the inventors. Table 2 shows the properties of 10 types of various carbon-containing compositions A-J. Among these, six types A to F are carbon-containing compositions that fall within the range of properties defined in the present invention. After pulverizing these compositions to a particle size with a 200 mesh pass rate of 70%, 1% by weight of an anionic additive was added to the carbon-containing composition, and water was further added to adjust the concentration.
The mixture was thoroughly mixed to form a slurry. The viscosity of the prepared slurry was measured using a B-type viscometer.As shown in the drawing, the carbon-containing composition V falls within the scope of the present invention, and both have a viscosity of 1000 cp (at 25°C) or less at a concentration of 70% by weight. A fluid slurry was obtained. Conversely, when a carbon-containing composition with properties that deviate from the scope of the present invention is used, the viscosity is 1000 cp (25°C) at a concentration of 70% by weight.
The result was a very high slurry. Although the uninvented object can be achieved without using additives, it is desirable to add additives if possible.

(The following is a blank space) Table 2 The additives used in the present invention include anionic, cationic, and/or ionic surfactants, used alone or in combination, and are appropriately selected depending on the type of coal. Specifically, the anionic surfactants include fatty oil sulfate ester salts, higher alcohol sulfate ester salts, nonionic ether sulfate ester salts, olefin sulfate ester salts, alkylaryl sulfonates, dibasic acid esters,
Rusulfonate - dialkyl sulfosuccinate, acyl sarcosinate, alkylbenzene sulfonate, alkyl phosphate ester salt, polyoxyethylene alkyl (alkylphenol) sulfate ester salt, alkyl phosphate ester salt, dialkyl sulfosuccinate ester salt, acrylic acid Alternatively, c/and a maleic anhydride copolymer, a polycyclic aromatic sulfonated product, or a formalin compound, etc. are used, and as the cationic surfactant, an allekylamine salt, a quaternary amine salt, etc. are used, Examples of nonionic surfactants include polyoxyalkyl ether-polyoxyethylene alkylphenol ether, oxyethylene/oxypropylene bronze polymer, polyoxyethylene alkylamine, sorbicun fatty acid ester, polyoxyethylene sorbicun fatty acid ester, and alkyltrimethyl ammonicum. Chloride, alkyldimethylbenzyl ammonicum chloride, alkylbi I
) dinicum salt, polyoxyethylene fatty acid Nisdel-aliphatic alcohol polyoxyethylene ether, alkylphenol polyoxyethylene ether, polyhydric alcohol fatty acid ester, fatty acid ethanolamide, etc. In addition, amine compounds such as 1, 2, 3 monoamines and diamines, higher alkyl amine acids, etc. are used.

Next, Examples of the present invention will be described.Example 1 Petroleum coke having the properties shown in Table 3 was crushed to 3 HIN or less, and then to 12K! /hc dry base) into a wet ball mill, and at the same time 180 g of anionic additive
/h (effective 1 minute 40%), water was further supplied so that the petroleum coke concentration was 72 folds, and crushed in a wet ball mill so that the petroleum coke particle size was 200 mesh or less and 75% by weight. 72% by weight slurry 1 from the outlet
Exhausted the no. The viscosity of the product slurry was measured with a B-type viscometer and found to be -880 cp (at 25 DEG C.), which showed good fluidity and could be flowed through piping using a normal centrifugal pump or plunger pump.

Table 3 Example 2 Degraded asphalt shown in Table 4 was prepared with a density of 200 mesh or less 6
After dry grinding to 0% by weight, 20kQ/
At the same time, anionic additives were added at 250 f/h (40% active ingredient) and water was supplied so that the deasphalt asphalt concentration became 71 euhedral. These raw materials were kneaded in a kneader at 50 revolutions per minute to produce a 71% by weight slurry at 28 kg/h. The viscosity of the product slurry was measured using a B-type viscometer and was found to be 600 cp (25° C.), indicating that a slurry with good fluidity was obtained.

As explained above, according to the method of the present invention, by selecting and using a carbon-containing composition that falls within a certain property range, it is possible to easily produce a highly concentrated slurry suitable for transportation and direct combustion. It has the excellent effect of being able to

[Brief explanation of drawings]

The drawing is a graph showing the relationship between slurry concentration and viscosity when various carbon-containing compositions shown in Table 2 are slurried.

Claims (1)

[Claims] 1 To produce a slurry by adding water and optional additives to a composition containing a carbon base, the carbon content is 82 to 98% by weight on a moisture-free, mineral-free basis - moisture-free and mineral-free. The ratio of the number of oxygen atoms/number of carbon atoms in the standard is 0.001 to 0.10
, adsorbed moisture is 0.01-6% by weight, specific surface area is 0.01
A carbon-containing composition having a property of ~777 t'/f/ is used, and the particle size of this carbon-containing composition is 4.
An aqueous slurry of a carbon-containing composition, which is prepared by adjusting the carbon-containing composition concentration to 0 to 90% by weight, and adding water and, if necessary, additives to produce a slurry having a carbon-containing composition concentration of 70% by weight or more. manufacturing method.