CN110551873B - Harmless process for artificial diamond waste graphite powder - Google Patents

Harmless process for artificial diamond waste graphite powder Download PDF

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Publication number
CN110551873B
CN110551873B CN201910955750.7A CN201910955750A CN110551873B CN 110551873 B CN110551873 B CN 110551873B CN 201910955750 A CN201910955750 A CN 201910955750A CN 110551873 B CN110551873 B CN 110551873B
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graphite powder
stirring
waste graphite
carrying
powder
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CN110551873A (en
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王强
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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/0025—Adding carbon material
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/06—Deoxidising, e.g. killing
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
    • C21C7/04—Removing impurities by adding a treating agent
    • C21C7/076—Use of slags or fluxes as treating agents
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Processing Of Solid Wastes (AREA)
  • Carbon And Carbon Compounds (AREA)

Abstract

The invention discloses a harmless process of artificial diamond waste graphite powder, which is used for solving the pollution problem of the waste graphite powder. Purchasing 50kg of heavy oil, wherein the water content is lower than 1.5%, and carrying to a production line for later use; purchasing 100kg of light-burned magnesia powder, wherein MgO is more than 90 percent, and carrying the light-burned magnesia powder to the site for later use; carrying 350kg of waste graphite powder to the site for later use; carrying 500kg of calcium carbonate small granules by pulling, wherein the granularity is as follows: 1-3 mm, CaO is more than 50%, and the mixture is used on site; firstly, adding 100kg of light-burned magnesia powder into a double-shaft stirrer, starting stirring, adding 50kg of heavy oil in a dripping mode in the stirring process, continuing stirring for 30min after adding, adding 350kg of waste graphite powder, continuing stirring for 40min after adding, and discharging after uniformly stirring; adding 500kg of calcium carbonate particles into the mixture, uniformly mixing, and feeding into a double-roller ball press to produce spheres with the particle size of 30-50 mm; the spheres are packaged by a moisture-proof bag and then are transported to an LF refining process of a steel plant to replace a refining submerged arc agent or other carbonaceous diffusion deoxidizers.

Description

Harmless process for artificial diamond waste graphite powder
Technical Field
The invention relates to a harmless process for artificial diamond waste graphite powder.
Background
The hardness of the diamond is far higher than that of all other substances, and the compressive strength, the heat dissipation rate, the sound transmission rate, the current impedance, the corrosion resistance, the light transmittance, the low thermal expansion rate, the negative and negative electricity property and even the solubility with the human body are the best materials, so that the artificial diamond has great development potential and promotes the industrial development of the artificial diamond.
The method for producing the artificial diamond by utilizing the nano graphite powder and the catalyst alloy catalyst is a mainstream process at present in China, and the waste graphite powder produced by the method contains various heavy metal substances and non-metallic compounds, is harmful to the environment, animals and plants and needs harmless treatment. From the chemical components of the waste graphite powder, the carbon content is high, and the waste graphite powder can be theoretically used as a carburant for steelmaking, but the granularity of the waste graphite powder is fine, so that the process requirement of the carburant in the steelmaking production or ironmaking production process is difficult to meet, and the characteristic of coexistence of multiple elements in the waste graphite powder makes the waste graphite powder be called as a chicken rib for resource utilization, so that the problem puzzling artificial diamond enterprises is solved.
In the journal of diamond and abrasive tool engineering of the sixth 2004, the royal optical ancestor of zhengzhou abrasive tool grinding research institute in reference to the document (1) published in the middle of a paper entitled "50 years of development and innovation of artificial diamond synthesis technology", there is a complete series of the current artificial diamonds, which can completely meet the requirements of various industrial application fields on the artificial diamonds as engineering materials, and the revolutionary changes of mechanical processing technology, geological and petroleum drilling technology, stone processing technology and the like are promoted. "is expressed in terms of content; (2) the journal entitled "artificial diamond surface chemical nickel plating process" of fanglii, zheng lotus, wu yangfei and chenpenghui at 2013, 9 th phase, discloses a paper, in which "nickel-plated diamond obtained by chemical plating method contains not only matrix C, deposited Ni element, but also P and trace O and Cl elements generated by side reaction. "is expressed in terms of content; (3) royal yuchang published a paper entitled "synthetic technology progress and main application of large synthetic single-crystal diamond" in journal of "superhard materials engineering" of 2008 th 6, and the paper has "after the diamond industry in China has made great success in the synthesis of abrasive-grade diamond, it faces the lagging situation in the development of new technologies represented by the synthesis of large single-crystal diamond again. The method calls for industry experts to strengthen the application research of the diamond and increase the development strength of new products while strengthening the development of new diamond synthesis technology, calls for leaders in the industry to have a great deal, makes development strategies of the diamond industry in China so as to deal with the lagging situation of the development of the new technology, and expresses the content.
As is clear from the above-disclosed documents, no contents are described on the research on recycling of the waste graphite powder of artificial diamond.
In the LF molten steel refining process, firstly, a graphite electrode is electrified to generate phase-to-phase short circuit with molten steel, a burning electric arc is generated to heat the molten steel, the temperature of an arc area is up to 3000-6000 ℃, in addition, the top slag needs to be diffused and deoxidized during heating, in the deoxidizing process, the slag is promoted to foam, foam slag is formed, the electric arc generated by burning of the graphite electrode in the LF smelting process is covered, and the heating efficiency is improved.
One of the main reasons for the formation of foamy slag is the ability to generate a stable source of gas in the slag, which may be CO from the decomposition of carbonate2Or CO generated after carbon element oxidation, so carbon-containing composite materials such as refining submerged arc agents, calcium carbide, silicon carbide and the like are used in the LF steel-making process. Using deoxidising materials containing carbon, byThe problem of carbureting molten steel by carbon-containing materials is solved.
From the above discussion, it can be known that the following problems need to be solved when the waste graphite powder is processed into the deoxidizing foaming material in the LF molten steel refining process:
1) solving the technical mode of utilizing the superfine powder;
the produced deoxidizing material meets the technological requirements of LF in storage, use performance and use effect.
Disclosure of Invention
The invention aims to provide a harmless process for artificial diamond waste graphite powder, which utilizes the characteristics of superfine graphite powder and combines the metallurgical principle to produce the waste graphite powder into a carbon-containing deoxidizing foaming material, is applied to an LF molten steel refining process and solves the problem of environmental pollution caused by the waste graphite powder.
The invention aims to realize the harmless process of the artificial diamond waste graphite powder, which is implemented according to the following steps:
1) purchasing 50kg of heavy oil, wherein the water content is lower than 1.5%, and carrying to a production line for later use;
2) purchasing 100kg of light-burned magnesia powder, wherein MgO is more than 90 percent, and carrying the light-burned magnesia powder to the site for later use;
3) carrying 350kg of waste graphite powder to the site for later use;
4) carrying 500kg of calcium carbonate small granules by pulling, wherein the granularity is as follows: 1-3 mm, CaO is more than 50%, and the mixture is used on site;
5) firstly, adding 100kg of light-burned magnesia powder into a double-shaft stirrer, starting stirring, adding 50kg of heavy oil in a dripping mode in the stirring process, continuing stirring for 30min after adding, adding 350kg of waste graphite powder, continuing stirring for 40min after adding, and discharging after uniformly stirring;
6) adding 500kg of calcium carbonate particles into the mixture, uniformly mixing, and feeding into a double-roller ball press to produce spheres with the particle size of 30-50 mm;
7) the spheres are packaged by a moisture-proof bag and then are transported to an LF refining process of a steel plant to replace a refining submerged arc agent or other carbonaceous diffusion deoxidizers.
The technical principle and innovation points of the invention are as follows:
the innovation points of the invention are as follows:
1) the heavy oil and magnesium oxide powder are mixed, the characteristics that the heavy oil is an acidic substance and the magnesium oxide is an alkaline substance are utilized, the heavy oil and the magnesium oxide react, and partial magnesium oxide reacts to generate grease acid salt, wherein the reaction equation is as follows:
CxHyCOOCnHm+MgO→CxHyCOOMg+CnYmOH
the above reaction exists as a film-like substance on the outer surface of the magnesium oxide powder.
2) The waste graphite powder is mixed with the grease acid salt, and the polar substances can bond the fine graphite powder to form a stable mixture, so that the problem of granulation of the fine graphite powder is solved, and the graphite powder is also a binder in the pelletizing process.
3) An oil film formed by grease molecules covers the surface layer of the magnesium oxide, so that the magnesium oxide is prevented from absorbing water and deliquescing in a humid environment.
4) After the magnesium oxide is added into the slag, the functions of reducing the melting point of the slag, adjusting the viscosity of the slag and promoting the foaming of the slag are achieved. Meanwhile, part of the magnesium oxide particles play a role in assisting the slag to form nucleation particles of bubbles.
5) The calcium carbonate mainly plays a role in thermal disintegration of the pellets, improves the reaction speed and releases CO2According to the characteristics of carbonate reaction, the calcium forsterite with low melting point is generated by the reaction with magnesium oxide while being decomposed into small-particle substances, becomes a liquid film of slag bubbles, promotes the rapid foaming of the slag, and graphite particles are adhered to the bubble film to participate in a deoxidation reaction, so that the probability of recarburization caused by contact with molten steel is reduced, and the method is also an important process method for preventing the recarburization of the molten steel.
6) The calcium carbonate particles are aggregates in the powder forming process and play a role of a skeleton.
7) After the slag is foamed, the reaction interface of the slag is increased, carbon in the middle of the pellets reacts with heavy metal oxides in the middle of the steel slag (FeO), MnO and the like, and the generated CO can also provide an air source for foaming the foamed slag and create conditions for continuous foaming of the slag while deoxidizing.
8) Harmful heavy metal substances in the middle of the waste graphite powder are subjected to self-reduction reaction in the LF slagging process and enter molten steel, so that harmless transformation of heavy metals is realized, and the thermodynamic data of the reaction are as follows:
[C]+NiO(s)=CO(g)+[Ni]
ΔGΘ=87660–166.78T
(Cu2O)+C(S)=2[Cu]+CO(g)
ΔGΘ=80690-212.38T
9) cyanide in the middle of the waste graphite is subjected to the following reaction to realize harmless conversion:
(HCN)=(N+)+(C+4)+(H+)
[H+]+(FeO)=[Fe]+{H2O}↑
(C+4)+(FeO)=[Fe]+{CO}↑
(N+)+(N+)={N2}↑
2HCN+3(FeO)=H2O+2CO+N2+3[Fe]
2HCN+3(FeO)=H2O+2CO+N2+3[Fe]
10) fluoride in the waste stone ink powder is subjected to the following reaction to realize harmless conversion:
2F-+Ca2+=CaF2
2F-+Mg2+= MgF2
the innovation point is the fusion innovation result of metallurgical physical chemistry, powder mechanics and crystal mechanics.
Detailed Description
A harmless process for artificial diamond waste graphite powder comprises the following specific examples:
1) purchasing 50kg of heavy oil, wherein the water content is lower than 1.5%, and carrying to a production line for later use;
2) purchasing 100kg of light-burned magnesia powder, wherein MgO is more than 90 percent, and carrying the light-burned magnesia powder to the site for later use;
3) carrying 350kg of waste graphite powder to the site for later use;
4) carrying 500kg of calcium carbonate small granules by pulling, wherein the granularity is as follows: 1-3 mm, CaO is more than 50%, and the mixture is used on site;
5) firstly, adding 100kg of light-burned magnesia powder into a double-shaft stirrer, starting stirring, adding 50kg of heavy oil in a dripping mode in the stirring process, continuing stirring for 30min after adding, adding 350kg of waste graphite powder, continuing stirring for 40min after adding, and discharging after uniformly stirring;
6) adding 500kg of calcium carbonate particles into the mixture, uniformly mixing, and feeding into a double-roller ball press to produce a ball body with the diameter of 30-50 mm;
7) the spheres are packaged by a moisture-proof bag and then are transported to an LF refining process of a steel plant to replace a refining submerged arc agent or other carbonaceous diffusion deoxidizers.

Claims (1)

1. A harmless process for artificial diamond waste graphite powder is characterized by being implemented according to the following steps:
1) purchasing 50kg of heavy oil with the water content lower than 1.5%, and carrying to a production line for later use;
2) purchasing 100kg of light-burned magnesia powder, wherein MgO is more than 90 percent, and carrying the light-burned magnesia powder to the site for later use;
3) 350kg of waste graphite powder is transported to the site for standby;
4) 500kg of calcium carbonate small granules in hauling, and the granularity: 1-3 mm, CaO is more than 50%, and the mixture is used on site;
5) firstly, adding 100kg of light-burned magnesia powder into a double-shaft stirrer, then starting stirring, adding 50kg of heavy oil in a dripping mode in the stirring process, continuing stirring for 30min after adding, adding 350kg of waste graphite powder, continuing stirring for 40min after adding, and discharging after uniformly stirring;
6) adding 500kg of calcium carbonate particles into the mixture, uniformly mixing, and feeding into a double-roller ball press to produce spheres with the particle size of 30-50 mm;
7) and packaging the spheres by a moisture-proof bag, and then carrying out pulling and conveying to an LF refining process of a steel mill to replace a refining submerged arc agent or other carbonaceous diffusion deoxidizers.
CN201910955750.7A 2019-10-09 2019-10-09 Harmless process for artificial diamond waste graphite powder Active CN110551873B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1580292A (en) * 2003-08-04 2005-02-16 郑州大学 Light composite steelmaking protective agent (slag)
CN1786202A (en) * 2005-12-16 2006-06-14 青岛森田金属有限公司 Composite carbon containing pellet
CN1986838A (en) * 2006-12-30 2007-06-27 李继宗 Steel making lime additive and its production process
JP2007277664A (en) * 2006-04-10 2007-10-25 Osaka Koukai Kk Lime-based flux for refining
CN105177223A (en) * 2015-08-25 2015-12-23 新疆中合大正商贸有限公司 Process of using magnesia-calcium-carbon balls in LF steel making
CN107130084A (en) * 2017-05-27 2017-09-05 马鞍山华盛冶金科技发展有限公司 It is a kind of to take off the agent for purifying molten steel being mingled with for molten steel

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1580292A (en) * 2003-08-04 2005-02-16 郑州大学 Light composite steelmaking protective agent (slag)
CN1786202A (en) * 2005-12-16 2006-06-14 青岛森田金属有限公司 Composite carbon containing pellet
JP2007277664A (en) * 2006-04-10 2007-10-25 Osaka Koukai Kk Lime-based flux for refining
CN1986838A (en) * 2006-12-30 2007-06-27 李继宗 Steel making lime additive and its production process
CN105177223A (en) * 2015-08-25 2015-12-23 新疆中合大正商贸有限公司 Process of using magnesia-calcium-carbon balls in LF steel making
CN107130084A (en) * 2017-05-27 2017-09-05 马鞍山华盛冶金科技发展有限公司 It is a kind of to take off the agent for purifying molten steel being mingled with for molten steel

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