阅读说明：本技术 一种炭素收尘粉再利用方法 (Carbon dust collection powder recycling method ) 是由 黄智新 魏国阳 翟红卫 黄二军 白琰 李耀辉 于 2021-09-01 设计创作，主要内容包括：本发明公开了一种炭素收尘粉再利用方法,包括以下步骤：准备固体中温沥青和收尘粉；在混捏锅内通入导热油预热；将收尘粉放入混捏锅内干混20分钟,然后加入准备好的中温沥青颗粒进行湿混20分钟；将混捏好的糊料倒入挤压成型机内,用挤压成型机将糊料挤压成生坯；将生坯通过水槽进行冷却,使生坯的温度冷却到小于45℃；将冷却过的生坯进行分组包装捆扎；将捆扎好的生坯放入焙烧炉,在隔绝空气下进行168小时焙烧,火道温度1150℃,坯料温度1050℃；将焙烧过的熟料冷却到常温；通过反击破或圆锥破设备将焙烧过的冷却到常温的熟料破碎到成3-6mm颗粒物料,作为焙烧车间填充料使用。本发明能够提高收尘粉利用价值,解决铝用阳极炭快生产过程中产生的尾料。(The invention discloses a carbon dust collection powder recycling method, which comprises the following steps: preparing solid medium-temperature asphalt and dust collecting powder; introducing heat conducting oil into the kneading pot for preheating; putting the dust-collecting powder into a kneading pot for dry mixing for 20 minutes, and then adding the prepared medium-temperature asphalt particles for wet mixing for 20 minutes; pouring the kneaded paste into an extrusion molding machine, and extruding the paste into a green body by using the extrusion molding machine; cooling the green body through a water tank to ensure that the temperature of the green body is cooled to be less than 45 ℃; packaging and bundling the cooled green bodies in groups; placing the bundled green bodies into a roasting furnace, and roasting for 168 hours in the air isolation, wherein the flame path temperature is 1150 ℃, and the blank temperature is 1050 ℃; cooling the roasted clinker to normal temperature; and crushing the roasted clinker cooled to normal temperature into 3-6mm granular materials by using a reverse impact crushing or cone crushing device, and using the granular materials as fillers in a roasting workshop. The invention can improve the utilization value of dust collecting powder and solve the problem of tailings generated in the production process of the anode carbon for aluminum.)

1. A carbon dust collecting powder recycling method comprises the following steps:

s1: preparing materials: preparing solid medium-temperature asphalt and dust collecting powder;

s2: preheating: introducing heat conducting oil into the kneading pot, and preheating the kneading pot;

s3: kneading: after preheating, putting the prepared dust collecting powder into the kneading pot, carrying out dry mixing, and after carrying out dry mixing for 20 minutes, adding the prepared medium-temperature asphalt particles, and carrying out wet mixing for 20 minutes to obtain a kneaded paste;

s4: molding: pouring the kneaded paste into an extrusion molding machine, and extruding the paste into a green body by using the extrusion molding machine;

s5: cooling for the first time: cooling the green body through a water tank to ensure that the temperature of the green body is cooled to be less than 45 ℃;

s6: packaging and bundling: packaging and bundling the cooled green bodies in groups;

s7: roasting: placing the bundled green bodies into a roasting furnace, and roasting for 168 hours in the air isolation, wherein the flame path temperature is 1150 ℃, and the blank temperature is 1050 ℃;

s8: and (3) cooling for the second time: cooling the roasted clinker to normal temperature;

s9: crushing: and crushing the roasted clinker cooled to normal temperature into granular materials by using a reverse impact crushing or cone crushing device, and using the granular materials as fillers in a roasting workshop.

2. The method for recycling carbon dust collection powder of claim 1, wherein: when kneading is carried out in a kneading pot, the solid medium-temperature asphalt accounts for 15-25% of the total material, and the dust collecting powder accounts for 75-85% of the total material.

3. The method for recycling carbon dust collection powder of claim 1, wherein: and dry-mixing the dust collection powder in the kneading pot, wherein the temperature of the dust collection powder is more than 100 ℃ after the dry mixing is carried out for 20 minutes.

4. The method for recycling carbon dust collection powder of claim 1, wherein: the particle size of the granular material crushed by the impact crushing or cone crushing equipment is 3-6 mm.

Technical Field

The invention belongs to the field of carbon blocks, and particularly relates to a recycling method of carbon dust.

Background

The anode carbon block is the heart of an electrolytic cell, a certain amount of dust collecting powder can be generated due to operations such as material conveying and damage in the production process of the anode carbon block, most of the dust collecting powder can be returned to a system for use, but a part of dust collecting powder (such as waste heat boiler dust collecting powder, return material dust collecting powder and anode scrap crushing system dust collecting powder) is still sold and treated at an extremely low price due to high ash content, so that great waste is caused, a method for recycling the dust collecting powder is urgently needed, and the economic value of the method is improved.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: overcomes the defects of the prior art and provides a carbon dust collection powder recycling method which can improve the utilization value of the dust collection powder.

The technical scheme adopted by the invention for solving the technical problem is as follows:

a carbon dust collecting powder recycling method comprises the following steps:

s1: preparing materials: preparing solid medium-temperature asphalt and dust collecting powder;

s2: preheating: introducing heat conducting oil into the kneading pot, and preheating the kneading pot;

s3: kneading: after preheating, putting the prepared dust collecting powder into the kneading pot, carrying out dry mixing, and after carrying out dry mixing for 20 minutes, adding the prepared medium-temperature asphalt particles, and carrying out wet mixing for 20 minutes to obtain a kneaded paste;

s4: molding: pouring the kneaded paste into an extrusion molding machine, and extruding the paste into a green body by using the extrusion molding machine;

s5: cooling for the first time: cooling the green body through a water tank to ensure that the temperature of the green body is cooled to be less than 45 ℃;

s6: packaging and bundling: packaging and bundling the cooled green bodies in groups;

s7: roasting: placing the bundled green bodies into a roasting furnace, and roasting for 168 hours in the air isolation, wherein the flame path temperature is 1150 ℃, and the blank temperature is 1050 ℃;

s8: and (3) cooling for the second time: cooling the roasted clinker to normal temperature;

s9: crushing: and crushing the roasted clinker cooled to normal temperature into granular materials by using a reverse impact crushing or cone crushing device, and using the granular materials as fillers in a roasting workshop.

When kneading is carried out in a kneading pot, the solid medium-temperature asphalt accounts for 15-25% of the total material, and the dust collecting powder accounts for 75-85% of the total material.

And dry-mixing the dust collection powder in the kneading pot, wherein the temperature of the dust collection powder is more than 100 ℃ after the dry mixing is carried out for 20 minutes.

The particle size of the granular material crushed by the impact crushing or cone crushing equipment is 3-6 mm.

The invention has the following positive beneficial effects:

the method is utilized to recycle the dust collection powder, most of high-ash dust collection powder, including waste heat boiler dust collection powder with high ash content, return material dust collection powder and residual anode crushing system dust collection powder, can be reprocessed, and finally crushed into 3-6mm granular materials after mixing kneading, molding, roasting and crushing treatment, and the granular materials are used as the roasting workshop fillers, so that the purpose of recycling the dust collection powder is achieved, and the utilization rate and the economic value of the dust collection powder are improved.

Drawings

FIG. 1 is a process flow diagram of a method for recycling carbon dust according to the present invention.

Detailed Description

The invention will be further explained and explained with reference to the accompanying drawing 1 and the specific embodiments:

example (b): a method for recycling carbon dust collecting powder comprises preparing solid medium temperature asphalt and dust collecting powder; the medium-temperature asphalt is a tar distillation residual liquid part, is black solid at normal temperature, accounts for 54-56% of tar, has no certain melting point, is melted in a certain melting point range, and has no thermal effect during solidification; the asphalt component is extremely complex, most of the asphalt component is aromatic hydrocarbons with more than three rings, and also contains heterocyclic compounds containing elements such as oxygen, nitrogen and sulfur and a small amount of high molecular carbon substances, and the molecular weight of the asphalt component is between 200 and 2000 and can reach 3000 at most; the medium-temperature asphalt is divided according to different softening points, and the medium-temperature asphalt with the softening point of 65-90 ℃;

collecting dust powder: the method refers to powdery carbon materials which are collected by dust removing equipment such as a dust remover, a multi-pipe cyclone dust remover and the like on a pulse belt and cannot be returned to a system for use due to high ash content in the production process of the anode carbon for aluminum.

After preparing solid medium-temperature asphalt and dust collecting powder, introducing heat conducting oil of 220 ℃ into a kneading pot, and preheating the kneading pot for 15 minutes to control the temperature of a cavity of the kneading pot to be 150 ℃ or 170 ℃; the heat conduction oil is also called heat transfer oil, has the performances of thermal cracking resistance and chemical oxidation resistance, has good heat transfer efficiency, quick heat dissipation and good thermal stability, and has the following characteristics as an industrial oil heat transfer medium: under the condition of almost normal pressure, very high operation temperature can be obtained, namely, the operation pressure and the safety requirement of a high-temperature heating system can be greatly reduced, and the reliability of the system and equipment is improved; the process requirements of heating and cooling at different temperatures can be met in a wider temperature range, or the process requirements of high-temperature heating and low-temperature cooling can be simultaneously realized by using the same heat conducting oil in the same system.

Preheating a kneading pot, putting materials with the total weight of 1000kg into the kneading pot in different categories, putting 750kg of 75 percent of dust collecting powder into the kneading pot, carrying out dry mixing, wherein after the dry mixing is carried out for 20 minutes, the temperature of the dust collecting powder reaches 110 ℃, then adding 250kg of 25 percent of medium-temperature asphalt particles into the kneading pot, and carrying out wet mixing for 20 minutes to obtain the kneaded paste with better plasticity;

the kneading pot is a device for uniformly stirring and mixing the materials such as carbon, asphalt and the like in a semi-dry state by the strong shearing action generated by a pair of blades which are matched and rotate mutually.

Pouring the kneaded paste into an extrusion molding machine, and extruding the paste into a green body by using the extrusion molding machine; cooling the green bodies through a water tank to cool the temperature of the green bodies to 42 ℃ or 40 ℃, and packaging and bundling the cooled green bodies in groups;

then placing the bundled green bodies into a roasting furnace, roasting for 168 hours in the air isolation, wherein the flame path temperature is 1150 ℃, and the blank temperature is 1050 ℃; after the baking is finished, cooling the baked green body to normal temperature; and crushing the roasted green body cooled to normal temperature into a granular material with the growth degree of 3mm by using a reverse impact crushing or conical crushing device, and using the granular material as a filling material in a roasting workshop, thereby achieving the purpose of recycling the dust collecting powder.

Example 2: the difference from example 1 is: the dust collecting powder accounts for 85 percent, and the medium temperature asphalt accounts for 15 percent.

Example 3: the difference from example 1 and example 2 is: and crushing the roasted green body cooled to the normal temperature into a granular material with the growth of 6mm by using a reverse crushing or cone crushing device.

The invention is not limited to the above embodiments, and those skilled in the art can make equivalent modifications or substitutions without departing from the spirit of the invention, and such equivalent modifications or substitutions are included in the scope defined by the claims of the present application.