阅读说明：本技术 一种新型炭复合材料及电极糊的制备方法 (Novel carbon composite material and preparation method of electrode paste ) 是由 吴志平 吴霄 肖东辉 于 2021-08-17 设计创作，主要内容包括：本发明提供一种新型炭复合材料,包括按重量份数计的如下成分：电煅无烟煤32-35份,煅后石油焦25-30份,人造石墨10-15份,改性煤沥青20-24份,氧化锡3-5份；其中,改性煤沥青的制备工艺包括如下步骤：步骤S1,将煤沥青、SBS改性剂、硫磺交联剂、改性添加剂按质量比30-35：10-15：5-6：1.5混合,所述改性添加剂包括纳米碳酸钙和纳米二氧化硅,且纳米碳酸钙与纳米二氧化硅的质量比为1：2；步骤S2,将步骤S1的混合料加入到剪切搅拌机中,在150-160℃条件下,搅拌反应50-60min,制备得到改性煤沥青。本发明提供的新型炭复合材料,灰分含量低、电阻率低、抗压强度高。本发明还提供了一种采用所述新型炭复合材料制备电极糊的方法。(The invention provides a novel carbon composite material which comprises the following components in parts by weight: 32-35 parts of electrically calcined anthracite, 25-30 parts of calcined petroleum coke, 10-15 parts of artificial graphite, 20-24 parts of modified coal pitch and 3-5 parts of tin oxide; the preparation process of the modified coal pitch comprises the following steps: step S1, mixing coal pitch, SBS modifier, sulphur cross linker and modified additive according to the mass ratio of 30-35: 10-15: 5-6: 1.5, wherein the modified additive comprises nano calcium carbonate and nano silicon dioxide, and the mass ratio of the nano calcium carbonate to the nano silicon dioxide is 1: 2; and S2, adding the mixture obtained in the step S1 into a shear mixer, and stirring and reacting for 50-60min at the temperature of 150-160 ℃ to prepare the modified coal pitch. The novel carbon composite material provided by the invention has the advantages of low ash content, low resistivity and high compressive strength. The invention also provides a method for preparing electrode paste by adopting the novel carbon composite material.)

1. The novel carbon composite material is characterized by comprising the following components in parts by weight:

32-35 parts of electrically calcined anthracite, 25-30 parts of calcined petroleum coke, 10-15 parts of artificial graphite, 20-24 parts of modified coal pitch and 3-5 parts of tin oxide; the preparation process of the modified coal pitch comprises the following steps:

step S1, mixing coal pitch, SBS modifier, sulphur cross linker and modified additive according to the mass ratio of 30-35: 10-15: 5-6: 1.5, wherein the modified additive comprises nano calcium carbonate and nano silicon dioxide, and the mass ratio of the nano calcium carbonate to the nano silicon dioxide is 1: 2;

step S2, adding the mixture obtained in the step S1 into a shear mixer, and stirring and reacting for 50-60min at the temperature of 150-160 ℃ to prepare modified coal pitch;

and step S3, crushing the modified coal asphalt prepared in the step S2 to be less than 0.5 mm.

2. The novel carbon composite material as claimed in claim 1, wherein the nano calcium carbonate has a particle size of 30 to 80nm and the nano silica has a particle size of 20 to 50 nm.

3. The novel carbon composite material as claimed in claim 1, wherein the electrically calcined anthracite has a particle size of 2-10 mm.

4. The novel carbon composite material as claimed in claim 1, wherein the particle size of the calcined petroleum coke is 1-5 mm.

5. The novel carbon composite material as claimed in claim 1, wherein the particle size of the artificial graphite is 50-100 μm.

6. The novel carbon composite according to claim 1, wherein the tin oxide has a particle size of 20 to 50 μm.

7. The novel carbon composite material as claimed in claim 1, wherein the shear rate of the shear mixer is 4500-.

8. A method for preparing an electrode paste, characterized by comprising the steps of:

uniformly mixing the raw material components of claim 1 to obtain the electrode paste product.

Technical Field

The invention relates to the technical field of conductive materials, in particular to a novel carbon composite material and a preparation method of electrode paste.

Background

The electrode paste is a conductive material used for electric furnace equipment such as large closed and open ferroalloy furnaces, calcium carbide furnaces, ferrosilicon furnaces, ferronickel furnaces and the like. The electrode paste is also called self-baking electrode, which is baked by the heat in the ore furnace, therefore, the matching of the consumption rate of the electrode and the baking rate is one of the keys of the use of the electrode paste. The traditional electrode paste is produced by taking steam, heat conduction oil or coal as a heat transfer source (the heating temperature is generally 120-140 ℃), taking calcined anthracite, calcined petroleum coke, metallurgical coke, artificial graphite fragments and the like as aggregates, crushing, grinding, screening and batching, taking coal pitch and coal tar as binders, kneading and profiling.

In a large ore-smelting furnace, the current density of the conductive electrode is high, and the melt scouring force is high, so that the electrode paste is required to have a low resistance coefficient to reduce the loss of electric energy; the volume density is higher, so that the porosity is reduced, and the oxidation resistance of the electrode is improved; has higher mechanical strength, so that the electrode can not be broken or chipped due to the influence of mechanical and electrical loads.

At present, the problems of high ash content, high resistivity and low compressive strength of electrode paste products in the market generally exist, the product quality is unstable, soft breaking or hard breaking and other accidents are easy to happen in the using process, and the electrode paste consumption and the power consumption of unit products are very high. In order to enhance the stability and the use effect of the product, the production of the electrode paste needs to be further optimized.

In view of the above, there is a need to provide a new material to solve the above technical problems.

Disclosure of Invention

The invention aims to provide a novel carbon composite material with low ash content, low resistivity, high volume density and high compressive strength.

In order to solve the problems, the technical scheme of the invention is as follows:

a novel carbon composite material comprises the following components in parts by weight:

32-35 parts of electrically calcined anthracite, 25-30 parts of calcined petroleum coke, 10-15 parts of artificial graphite, 20-24 parts of modified coal pitch and 3-5 parts of tin oxide; the preparation process of the modified coal pitch comprises the following steps:

step S1, mixing coal pitch, SBS modifier, sulphur cross linker and modified additive according to the mass ratio of 30-35: 10-15: 5-6: 1.5, wherein the modified additive comprises nano calcium carbonate and nano silicon dioxide, and the mass ratio of the nano calcium carbonate to the nano silicon dioxide is 1: 2;

step S2, adding the mixture obtained in the step S1 into a shear mixer, and stirring and reacting for 50-60min at the temperature of 150-160 ℃ to prepare modified coal pitch;

and step S3, crushing the modified coal asphalt prepared in the step S2 to be less than 0.5 mm.

Furthermore, the particle size of the nano calcium carbonate is 30-80nm, and the particle size of the nano silicon dioxide is 20-50 nm.

Furthermore, the particle size of the electrically calcined anthracite is 2-10 mm.

Furthermore, the particle size of the calcined petroleum coke is 1-5 mm.

Further, the particle size of the artificial graphite is 50 to 100 μm.

Further, the particle size of the tin oxide is 20 to 50 μm.

Further, the shear rate of the shear mixer was 4500-.

The invention also provides a preparation method of the electrode paste, which comprises the following steps:

and (3) uniformly mixing the raw material components to obtain the electrode paste product.

Compared with the prior art, the novel carbon composite material and the preparation method of the electrode paste have the beneficial effects that:

according to the novel carbon composite material provided by the invention, electrically calcined anthracite, calcined petroleum coke and artificial graphite are selected as electrode paste aggregates, so that the ash content of raw materials is reduced, and the resistivity is reduced; the modified coal pitch is modified by SBS, nano inorganic filler and sulfur cross-linking agent, so that the stability and coking value of the modified coal pitch are improved, the oxidation resistance of the coal pitch after coking is improved, and the prepared electrode paste has high mechanical strength and conductivity. The electrode paste product is not required to be heated in the kneading and stirring process, no asphalt smoke is discharged, the working environment is improved, and the production energy consumption is reduced.

Detailed Description

The following description of the present invention is provided to enable those skilled in the art to better understand the technical solutions in the embodiments of the present invention and to make the above objects, features and advantages of the present invention more comprehensible.

The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual values, and between the individual values may be combined with each other to yield one or more new ranges of values, which ranges of values should be considered as specifically disclosed herein.

In the invention, the main components of the aggregate of the electrode paste are electrically calcined anthracite, calcined petroleum coke and artificial graphite.

The electrically calcined anthracite is produced by selecting high-quality anthracite and calcining the anthracite at 2000 ℃ through a unidirectional alternating current calcining furnace, and can effectively remove moisture and volatile matters, improve the true density and the conductivity, and enhance the mechanical strength and the oxidation resistance in the production process.

The calcined petroleum coke is obtained by calcining raw coke at a high temperature of about 1300 ℃, so that volatile substances are removed as much as possible, and volume shrinkage is reduced, thereby improving the high-temperature strength and the conductivity of the electrode.

The artificial graphite is a graphite material obtained by carbonizing organic matters such as petroleum coke, pitch coke and the like and then performing high-temperature treatment at the temperature of more than 2800 ℃, and has the characteristics of low ash content and good electrical conductivity.

In the invention, the binder coal pitch is modified coal pitch by SBS, nano inorganic filler and sulfur cross-linking agent, the modified coal pitch improves the stability and coking value of the coal pitch, and the mechanical strength, conductivity and oxidation resistance of the product are improved when the modified coal pitch is applied to electrode paste.

And the tin oxide is doped in the composite material, so that the conductivity and the oxidation resistance of the electrode paste can be improved.

Example 1

A novel carbon composite material comprises the following components in parts by weight:

32 parts of electrically calcined anthracite, 30 parts of calcined petroleum coke, 12 parts of artificial graphite, 23 parts of modified coal pitch and 3 parts of tin oxide; the preparation process of the modified coal pitch comprises the following steps:

step S1, mixing coal tar pitch, SBS modifier, sulfur cross-linking agent and modified additive according to the mass ratio of 30: 10: 5: 1.5, wherein the modified additive comprises nano calcium carbonate and nano silicon dioxide, and the mass ratio of the nano calcium carbonate to the nano silicon dioxide is 1: 2;

wherein the particle size of the nano calcium carbonate is 30-80nm, and the particle size of the nano silicon dioxide is 20-50 nm;

step S2, adding the mixture obtained in the step S1 into a shear mixer, and stirring and reacting for 50-60min at the temperature of 150-160 ℃ to prepare modified coal pitch; wherein the shear rate is 4500-;

and step S3, crushing the modified coal asphalt prepared in the step S2 to be less than 0.5 mm.

The modified coal pitch of this example had a softening point of 102 ℃.

In the embodiment, the particle size of the electrically calcined anthracite is 2-10 mm; the particle size of the calcined petroleum coke is 1-5 mm; the particle size of the artificial graphite is 50-100 μm.

The process for preparing the electrode paste by using the novel carbon composite material of the embodiment is as follows:

and uniformly mixing the raw material components to obtain the electrode paste product.

Example 2

A novel carbon composite material comprises the following components in parts by weight:

35 parts of electrically calcined anthracite, 25 parts of calcined petroleum coke, 15 parts of artificial graphite, 20 parts of modified coal pitch and 5 parts of tin oxide; the preparation process of the modified coal pitch comprises the following steps:

step S1, mixing coal tar pitch, SBS modifier, sulfur cross-linking agent and modified additive according to the mass ratio of 35: 15: 5: 1.5, wherein the modified additive comprises nano calcium carbonate and nano silicon dioxide, and the mass ratio of the nano calcium carbonate to the nano silicon dioxide is 1: 2;

wherein the particle size of the nano calcium carbonate is 30-80nm, and the particle size of the nano silicon dioxide is 20-50 nm;

step S2, adding the mixture obtained in the step S1 into a shear mixer, and stirring and reacting for 50-60min at the temperature of 150-160 ℃ to prepare modified coal pitch; wherein the shear rate is 4500-;

and step S3, crushing the modified coal asphalt prepared in the step S2 to be less than 0.5 mm.

The modified coal pitch of this example had a softening point of 101 ℃.

Other conditions of this example were the same as in example 1.

Example 3

A novel carbon composite material comprises the following components in parts by weight:

34 parts of electrically calcined anthracite, 28 parts of calcined petroleum coke, 10 parts of artificial graphite, 24 parts of modified coal pitch and 4 parts of tin oxide; the preparation process of the modified coal pitch comprises the following steps:

step S1, mixing coal tar pitch, SBS modifier, sulfur cross-linking agent and modified additive according to the mass ratio of 32: 12: 6: 1.5, wherein the modified additive comprises nano calcium carbonate and nano silicon dioxide, and the mass ratio of the nano calcium carbonate to the nano silicon dioxide is 1: 2;

wherein the particle size of the nano calcium carbonate is 30-80nm, and the particle size of the nano silicon dioxide is 20-50 nm;

step S2, adding the mixture obtained in the step S1 into a shear mixer, and stirring and reacting for 50-60min at the temperature of 150-160 ℃ to prepare modified coal pitch; wherein the shear rate is 4500-;

and step S3, crushing the modified coal asphalt prepared in the step S2 to be less than 0.5 mm.

The modified coal pitch of this example had a softening point of 104 ℃.

Other conditions of this example were the same as in example 1.

The electrode pastes prepared in examples 1 to 3 were subjected to performance tests, the test results being shown in table 1:

table 1: results of electrode paste Performance test

The data show that the electrode paste prepared from the carbon composite material has the advantages of low ash content, low resistivity, high volume density, high compressive strength and the like, and the conductivity and the oxidation resistance of the electrode paste are improved.

The embodiments of the present invention have been described in detail, but the present invention is not limited to the described embodiments. Various changes, modifications, substitutions and alterations to these embodiments will occur to those skilled in the art without departing from the spirit and scope of the present invention.