CN108675294A - A kind of production method of coaly activated carbon powder - Google Patents

Abstract

A kind of production method of coaly activated carbon powder, this method carry out according to the following steps：Step 1：It controls reduction kiln metabituminous coal and volume ratio is added not less than 1 with ilmenite concentrate：1, high-temperature region temperature is not less than 1100 DEG C in reduction kiln, generates duff ash；Step 2：Duff ash is subjected to magnetic separation through 1000 1500GS magnetic separators of magnetic field intensity；Step 3：Duff ash after magnetic separation is crossed into the screening of 10 40 mesh screens, the coal grain on sieve removes heavier impurity waste through dry type jigging machine, obtains pure coal grain again；The lower coal ash of sieve is removed by wind-force powder concentrator than heavier impurity waste, obtains pure coal ash；Step 4：By pure coal grain and coal ash merga pass Raymond mill milling to get coal quality activated carbon powder；Wherein, rotary kiln production reduced ilmenite selects smart bituminous coal of the fixed carbon not less than 48%, fugitive constituent not less than 25%, ash content no more than 8% with bituminous coal.This method need not again individually be crushed raw coal, activation process, reduce energy consumption, saved coaly activated carbon production cost.

Description

A kind of production method of coal-based activated carbon powder

technical field

The invention relates to a production method of activated carbon powder, in particular to a production method for producing coal-based activated carbon powder by using fine coal ash, the solid waste produced by reducing ilmenite in a rotary kiln.

Background technique

Coal-based activated carbon is a black porous solid carbon. The activated carbon has a well-developed pore structure, a large surface area, and strong physical adsorption properties. It can adsorb gases, liquids or colloidal solids. Coal-based activated carbon is produced from high-quality raw coal through crushing and molding activation.

Coal-based activated carbon has high strength and has a strong adsorption capacity for organic matter, free chlorine and harmful gases in the air. It is widely used as an excellent adsorbent for sewage treatment in environmental protection industries and deep purification of urban drinking water. It is also used to remove air. Bacteria and toxic gases.

The production of reduced ilmenite by rotary kiln is based on bituminous coal. In the production process, coal is used as a heating fuel on the one hand, and on the other hand, it is used as a reducing agent to generate CO to reduce ilmenite concentrate to reduced ilmenite. The bituminous coal is not completely burned during the production process. After screening, the coarse incompletely burned coal particles are returned for recycling, and the fine coal particles and powdered coal ash (collectively referred to as fine coal ash) are usually used due to their certain calorific value. Shipped to the brick factory for use as an internal combustion agent.

Contents of the invention

The purpose of the present invention is to provide a production method of coal-based activated carbon powder, which does not need to separately crush and activate raw coal, reduces energy consumption, and saves the production cost of coal-based activated carbon.

To achieve the above object, the present invention provides the following technical solutions:

A kind of production method of coal-based activated carbon powder, the method is carried out according to the following steps:

Step 1: Control the volume ratio of bituminous coal and titanium concentrate in the reduction kiln to not be lower than 1:1, and the temperature in the high temperature zone in the reduction kiln is not lower than 1100°C to produce fine coal ash;

Step 2: Carry out magnetic separation of the fine coal ash through a magnetic separator with a magnetic field strength of 1000-1500GS;

Step 3: Sieve the fine coal ash after magnetic separation through a 10-40 mesh screen, and the coal particles on the sieve are then removed by a dry jig to remove heavier impurities and waste to obtain pure coal particles; the coal ash under the sieve After the wind power separator removes relatively heavy impurities and wastes, pure coal ash is obtained;

Step 4: Combine pure coal particles and coal ash through Raymond mill to obtain coal-based activated carbon powder;

Among them, the bituminous coal used for the reduction of ilmenite in the rotary kiln is selected from clean bituminous coal with fixed carbon not less than 48%, volatile matter not less than 25%, and ash content not greater than 8%.

Among the above, the fixed carbon of bituminous coal is 52-56%.

Among the above, the volatile content of bituminous coal is 33-35%.

Among the above, the ash content of bituminous coal is 7.0-8%.

In the above, the volume ratio of bituminous coal and titanium concentrate in the reduction kiln is 1-1.5:1.

Among the above, the temperature in the high temperature zone in the reduction kiln is 1100-1120°C.

The present invention has the following characteristics:

1. Using the rotary kiln to produce and reduce the waste fine coal ash of ilmenite to produce coal-based activated carbon powder does not need to separately crush and activate the raw coal, which reduces energy consumption and saves the production cost of coal-based activated carbon.

2. Effective and comprehensive utilization of the solid waste produced in the production of reduced ilmenite can turn waste into treasure, save resources and protect the environment.

3. Through the comprehensive processing of fly ash into coal-based activated carbon powder, better economic benefits have been created.

Detailed ways

Example 1

The technical indicators of bituminous coal used in the reduction of ilmenite produced by the rotary kiln provided in this example are: fixed carbon: 52%; volatile matter: 34%; ash content: 8%.

Step 1: Control the volume ratio of bituminous coal and titanium concentrate in the reduction kiln to 1:1, and the temperature in the high temperature zone in the reduction kiln is 1100°C to produce fine coal ash.

Step 2: Carry out magnetic separation and separation of fine coal ash through a magnetic separator with a magnetic field strength of 1000GS to obtain non-magnetic fine coal ash. The ash content of the coal particles after inspection is: 5%, which meets the requirements for the production of coal-based activated carbon;

Step 3: Sieve the non-magnetic fine coal ash through a 30-mesh sieve. The coal particles on the screen are then passed through a dry jig to remove heavier impurities and waste to obtain pure coal particles. The coal ash under the sieve is separated by wind power The machine removes relatively heavy impurities and wastes to obtain pure coal ash;

Step 4: Combine pure coal particles and pure coal ash through a Raymond mill and sieve through a 200-mesh sieve to obtain coal-based activated carbon powder.

Coal-based activated carbon powder products can be made into various coal-based activated carbon products according to the needs of the application.

The technical indicators of coal-based activated carbon powder after inspection are as follows:

This coal-based activated carbon powder meets the technical indicators of the national standard for manufacturing coal-based granular activated carbon for water purification.

Example 2

The technical indicators of the clean bituminous coal used in the reduction of ilmenite produced by the rotary kiln provided in this example are: fixed carbon: 54%; volatile matter: 33%; ash content: 7.5%.

Step 1: The volume ratio of bituminous coal and titanium concentrate in the reduction kiln is 1.2:1, and the temperature in the high temperature zone in the reduction kiln is 1150°C to produce fine coal ash.

Step 2: The fine coal ash is separated by magnetic separation through a magnetic separator with a magnetic field strength of 1300GS to obtain non-magnetic fine coal ash. The ash content of the coal particles is 3.3% after inspection, which meets the requirements for the production of coal-based activated carbon;

Step 3: Sieve the non-magnetic fine coal ash through a 40-mesh sieve, and the coal particles on the screen are then passed through a dry jig to remove heavier impurities and waste to obtain pure coal particles; the coal ash under the sieve is separated by wind power The machine removes relatively heavy impurities and wastes to obtain pure coal ash;

Step 4: Combine the pure coal particles and pure coal ash obtained in step 3 and pass them through a Raymond mill, and sieve them through a 200-mesh sieve to obtain coal-based activated carbon powder.

Coal-based activated carbon powder products can be made into various coal-based activated carbon products according to the needs of the application.

The technical indicators of coal-based activated carbon powder after inspection are as follows:

This coal-based activated carbon powder meets the technical indicators of the national standard for manufacturing coal-based granular activated carbon for air purification.

Example 3

The technical indicators of the clean bituminous coal used in the reduction of ilmenite produced by the rotary kiln provided in this example are: fixed carbon: 56%; volatile matter: 35%; ash content: 7.0%.

Step 1: The volume ratio of bituminous coal and titanium concentrate in the reduction kiln is 1.5:1, and the temperature in the high temperature zone in the reduction kiln is 1200°C to obtain fine coal ash.

Step 2: The fine coal ash is separated by magnetic separation through a magnetic separator with a magnetic field strength of 1500GS to obtain non-magnetic fine coal ash. The ash content of the coal particles after inspection is: 4.0%, which meets the requirements for the production of coal-based activated carbon;

Step 3: Sieve the non-magnetic fine coal ash through a 20-mesh sieve, and the coal particles on the sieve are then passed through a dry jig to remove heavier impurities and waste to obtain pure coal particles; the coal ash under the sieve is separated by wind power The machine removes relatively heavy impurities and wastes to obtain pure coal ash;

Step 4: Combine the pure coal particles and pure coal ash obtained in step 3 and pass them through a Raymond mill, and sieve them through a 200-mesh sieve to obtain coal-based activated carbon powder.

Coal-based activated carbon powder products can be made into various coal-based activated carbon products according to the needs of the application.

The technical indicators of coal-based activated carbon powder after inspection are as follows:

This coal-based activated carbon powder meets the technical indicators of the national standard for manufacturing coal-based granular activated carbon for carriers.

Claims (6)

1. a kind of production method of coaly activated carbon powder, which is characterized in that this method carries out according to the following steps：

Step 1：It controls reduction kiln metabituminous coal and volume ratio is added not less than 1 with ilmenite concentrate：1, high-temperature region temperature is not low in reduction kiln In 1100 DEG C, duff ash is generated；

Step 2：Duff ash is subjected to magnetic separation through magnetic field intensity 1000-1500GS magnetic separators；

Step 3：Duff ash after magnetic separation is crossed into the screening of 10-40 mesh screens, the coal grain on sieve removes through dry type jigging machine heavier again Impurity waste, obtain pure coal grain；The lower coal ash of sieve is removed by wind-force powder concentrator than heavier impurity waste, is obtained pure Coal ash；

Step 4：By pure coal grain and coal ash merga pass Raymond mill milling to get coal quality activated carbon powder；

Wherein, rotary kiln production reduced ilmenite selects fixed carbon not less than 25%, ash content not less than 48%, fugitive constituent with bituminous coal Smart bituminous coal more than 8%.

2. a kind of production method of coaly activated carbon powder according to claim 1, which is characterized in that the fixed carbon of bituminous coal is 52-56%.

3. a kind of production method of coaly activated carbon powder according to claim 1, which is characterized in that the fugitive constituent of bituminous coal is 33-35%.

4. a kind of production method of coaly activated carbon powder according to claim 1, which is characterized in that cigarette pit ash is 7.0-8%.

5. a kind of production method of coaly activated carbon powder according to claim 1, which is characterized in that reduction kiln metabituminous coal with The volume ratio that ilmenite concentrate is added is 1-1.5：1.

6. a kind of production method of coaly activated carbon powder according to claim 1, which is characterized in that high-temperature region in reduction kiln Temperature is 1100-1120 DEG C.