CN103272533B - Pitch sphere oxidative stabilization method - Google Patents

Abstract

A kind of asphalt pellets oxidation non-melting method is that in the rotary furnace or the fixed bed reactor that is equipped with pitch pellets, need 200-800 liters of air per hour per kilogram of pitch pellets to feed into the air; Raise the temperature from room temperature to 180-250°C and stay for 2-5 hours to obtain preliminary oxidized pitch balls; the preliminary oxidized pitch balls are further oxidized in the tunnel kiln. The tunnel kiln is divided into 5-10 sections, and the temperature of the next section is the same as that of the upper section. The temperature difference in one stage is 20-40°C, the initial temperature is 150-220°C, and the end temperature is 290-350°C. The total residence time of asphalt in the tunnel kiln is 7-15h to obtain oxidized and non-melting asphalt balls. The air volume is 300-1000 liters of air per kilogram of asphalt balls per hour. The present invention adopts two types of furnaces to oxidize without melting, avoids ignition in the process of asphalt oxidation, ensures safe production, and has the advantages of uniform oxidation of products.

Description

Oxidation and non-melting method of asphalt balls

technical field

The invention belongs to a method for oxidation and non-melting of asphalt balls.

Background technique

Pitch-based spherical activated carbon is a high-performance activated carbon that is used in many fields. However, it is essential for oxidation and non-melting in the preparation process.

At present, many patents involve the technology of preparing spherical activated carbon from asphalt, such as: Chinese invention patent 201210317727 "Preparation method of pitch-based spherical activated carbon with low energy consumption" uses nitrogen containing oxygen to oxidize asphalt balls without melting, Chinese invention patent 03178572 "Preparation method of pitch-based spherical activated carbon rich in mesopores" only mentions that the asphalt balls are heated to 250-300°C with air to obtain infusible pitch balls, Chinese invention patent 200410100531 "Method for preparing spherical activated carbon" only mentions The flow method is used to oxidize and infusible asphalt balls, and there are many Chinese patents such as Chinese invention patent 200610127621 "a method for preparing spherical activated carbon with low heavy metal content", Chinese invention patent 200810035853 "a nitrogen-containing pitch-based spherical activated carbon "Preparation Method of Spherical Activated Carbon", Chinese Invention Patent 97101617 "Preparation Method of Spherical Activated Carbon" and Chinese Invention Patent 201010143602 "Preparation Method of Pitch Balls" all briefly mentioned oxidation infusion, but did not discuss how to carry out oxidation infusion treatment Provide corresponding methods.

Contents of the invention

The object of the present invention is to provide a method for oxidizing and infusible treatment of asphalt balls.

Method of the present invention is realized according to the following steps:

(1) In a rotary furnace or a fixed bed reactor equipped with asphalt balls, 200-800 liters of air is required per kilogram of asphalt balls per hour to feed the air; the temperature is raised from room temperature to 180-180- 250°C, stay for 2-5 hours, and obtain the initially oxidized asphalt balls;

(2) The initially oxidized asphalt balls are further oxidized in the tunnel kiln. The tunnel kiln is divided into 5-10 sections. The temperature difference between the next section and the previous section is 20-40°C, and the initial temperature is 150-220°C. The termination temperature is 290-350°C, and the total residence time of the asphalt in the tunnel kiln is 7-15 hours to obtain oxidized and non-melting asphalt balls, wherein the air volume introduced is 300-1000 liters of air per kilogram of asphalt balls per hour.

The ball diameter of the asphalt ball as mentioned above is between 0.1-1.5mm.

Advantages of the present invention:

1 This patent can not only process small balls with a diameter as small as 0.1mm, but also process asphalt balls with a diameter as high as 1.5mm;

2 Two types of furnaces are used for oxidation without melting. While increasing production capacity, it avoids ignition during asphalt oxidation, which is the biggest safety production problem in the process of asphalt oxidation; in addition, the use of tunnel kiln can also greatly improve product safety. Oxidation uniformity;

3 Due to the short-time, large-capacity oxidation and non-melting treatment in the rotary furnace or fixed bed in advance, the production capacity of the final product can be expanded;

4. By performing higher temperature oxidation and non-melting treatment in the rotary furnace or fixed bed in advance, this can increase the initial temperature of oxidation in the subsequent tunnel kiln, thereby speeding up the speed of oxidation and non-melting, and it is also beneficial to increase production capacity.

Detailed ways

In the examples, the degree of oxidized infusibility of asphalt balls can be calculated according to the cohesive rate: heat the oxidized infusible asphalt balls to 800°C in _N2 atmosphere and stay there for 1 hour to obtain carbonized asphalt balls; randomly select 30-50 carbonized asphalt balls For balls, the percentage of the total number of particles adhering together to the total number of particles is the cohesion rate.

Example 1

Put 100 kg of 1.5mm asphalt balls into the rotary furnace, pass in 800 liters/kg.h of air, then raise the temperature from room temperature to 250°C at a heating rate of 20°C/h, and stay for 2h; the initially oxidized asphalt The ball is transferred into the tunnel kiln. The temperature section of the tunnel kiln is divided into 8 sections, the temperature difference of each section is 20°C, the starting temperature is 150°C, and the ending temperature is 310°C. The air volume is 1000 liters/kg.h . The total residence time of asphalt in the tunnel kiln is 15h to obtain oxidized infusible asphalt balls. Its bonding rate is 3.8%.

Example 2

Put 10 kg of 0.1mm asphalt balls into the fixed bed, feed 400 liters/kg.h of air, then raise the temperature from room temperature to 200°C at a heating rate of 50°C/h, and stay for 4 hours; the initially oxidized asphalt balls Turning into the tunnel kiln, the temperature section of the tunnel kiln is divided into 5 sections, each section has a temperature difference of 30°C, the starting temperature is 180°C, and the ending temperature is 330°C, and the air volume is 300 liters/kg.h. The total residence time of asphalt in the tunnel kiln is 7h to obtain oxidized infusible asphalt balls. Its bonding rate is 5.7%.

Example 3

Put 30 kg of 1.2mm asphalt balls into the rotary furnace, feed 600 liters/kg.h of air, then raise the temperature from room temperature to 230°C at a heating rate of 30°C/h, and stay for 3h; the initially oxidized asphalt balls Turning into the tunnel kiln, the temperature section of the tunnel kiln is divided into 6 sections, each section has a temperature difference of 25°C, the starting temperature is 160°C, and the ending temperature is 310°C, and the air volume is 800 liters/kg.h. The total residence time of asphalt in the tunnel kiln is 13h to obtain oxidized infusible asphalt balls. Its bonding rate is 2.4%.

Example 4

Put 4 kg of 1.0mm asphalt balls in the fixed bed, pass in 500 liters/kg.h of air, then raise the temperature from room temperature to 180°C at a heating rate of 35°C/h, and stay for 5h; the initially oxidized asphalt The ball is transferred into the tunnel kiln. The temperature section of the tunnel kiln is divided into 10 sections, the temperature difference of each section is 30°C, the starting temperature is 150°C, and the ending temperature is 350°C. The air volume is 500 liters/kg.h . The total residence time of asphalt in the tunnel kiln is 12h to obtain oxidized infusible asphalt balls. Its bonding ratio is 2.1%.

Example 5

Put 0.5kg of 0.5mm asphalt balls in the fixed bed, pass in 200 liters/kg.h of air, then raise the temperature from room temperature to 180°C at a heating rate of 40°C/h, and stay for 3h; the initially oxidized asphalt The ball is transferred into the tunnel kiln. The temperature section of the tunnel kiln is divided into 7 sections, the temperature difference of each section is 20°C, the starting temperature is 150°C, and the ending temperature is 290°C. The air volume is 500 liters/kg.h . The total residence time of asphalt in the tunnel kiln is 8h to obtain oxidized infusible asphalt balls. Its bonding rate is 1.2%.

Example 6

Put 1000 kilograms of 0.3mm asphalt balls into the rotary furnace, pass in 300 liters/kg.h of air, then raise the temperature from room temperature to 240°C at a heating rate of 45°C/h, and stay for 2h; the initially oxidized asphalt balls Turning into the tunnel kiln, the temperature section of the tunnel kiln is divided into 5 sections, each section has a temperature difference of 20°C, the starting temperature is 220°C, and the ending temperature is 320°C, and the air volume is 500 liters/kg.h. The total residence time of asphalt in the tunnel kiln is 70h to obtain oxidized infusible asphalt balls. Its bonding rate is 0.8%.

Claims (2)

1. a kind of asphalt ball oxidation non-melting method is characterized in that comprising the steps: (1) In a rotary furnace or a fixed bed reactor equipped with asphalt balls, 200-800 liters of air is required per kilogram of asphalt balls per hour to feed the air; the temperature is raised from room temperature to 180-180- 250°C, stay for 2-5 hours, and obtain the initially oxidized asphalt balls; (2) The initially oxidized asphalt balls are further oxidized in the tunnel kiln. The tunnel kiln is divided into 5-10 sections. The temperature difference between the next section and the previous section is 20-40°C, and the initial temperature is 150-220°C. The termination temperature is 290-350°C, and the total residence time of the asphalt in the tunnel kiln is 7-15 hours to obtain oxidized and non-melting asphalt balls, wherein the air volume introduced is 300-1000 liters of air per kilogram of asphalt balls per hour. 2. A kind of asphalt ball oxidation non-melting method as claimed in claim 1, is characterized in that the ball diameter of described pitch ball is between 0.1-1.5mm.