CN104098099A - Method utilizing waste carbon-containing pellets to smelt silicon - Google Patents
Method utilizing waste carbon-containing pellets to smelt silicon Download PDFInfo
- Publication number
- CN104098099A CN104098099A CN201410294993.8A CN201410294993A CN104098099A CN 104098099 A CN104098099 A CN 104098099A CN 201410294993 A CN201410294993 A CN 201410294993A CN 104098099 A CN104098099 A CN 104098099A
- Authority
- CN
- China
- Prior art keywords
- silicon
- powder
- raw material
- binding agent
- carbon source
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
- Y02P20/00—Technologies relating to chemical industry
- Y02P20/10—Process efficiency
Abstract
The invention provides a method utilizing waste carbon-containing pellets to smelt silicon. The method comprises the following steps: mixing a silicon-containing raw material, a carbon source, a binder and water, pressing to obtain the carbon-containing pellets, drying the pellets, and adding the dried pellets into an electric furnace according to reasonable application proportion and distribution mode for silicon smelting, wherein the silicon-containing raw material comprises one or more of micro silicon powder and silica powder, the mass fraction of silicon dioxide in the micro silicon powder is more than or equal to 95%; the carbon source comprises one or more of charcoal powder, petroleum coke powder and graphite powder. According to the process, the clearance between the silicon-containing raw material and a reducing agent is reduced to be micron-sized, the reaction interface is enlarged, the reaction speed is increased, the consumption of the reducing agent is greatly lowered, and the reaction time is greatly shortened, so that the production period can be favorably shortened to achieve the purposes of saving energy, reducing emission, lowering the cost and comprehensively and efficiently utilizing resources.
Description
Technical field
The invention belongs to carbonaceous pelletizing applied technical field, be specifically related to a kind of method of utilizing waste carbonaceous pelletizing metal smelting silicon.
Background technology
In tradition refining silicon technology, raw material is by silica (SiO
2) and reductive agent (charcoal, refinery coke etc.) composition, refining silicon process is produced continuously in Semi closed electric furnace, the heat that in smelting process, electric current produces by electrode and charging resistance and the arc heat of electrode tip are heated to furnace charge more than 2000 DEG C, at this temperature, silicon-dioxide has been generated Pure Silicon Metal liquid through a series of physical-chemical reaction by carbon reduction, and overflows with CO gas and SILICA FUME.
But in the normal running of refining silicon electric furnace, especially large and medium-sized electric furnace, requires furnace charge to have suitable lumpiness to guarantee good ventilation property.Therefore the silica and the charcoal that, enter stove will have certain granularity requirements.Generally, the granularity of silica is controlled at 40-120mm, and charcoal granularity is controlled at 20-200mm.This just requires will to carry out fragmentation, screening to silica and reductive agent in the raw material preparatory stage, to meet the granularity requirements into furnace charge.
The refining such as the bitstone that can not enter stove (granularity <40mm) and wood fragments charcoal (granularity <20mm) the silicon waste enormous amount producing in crushing and screening process.According to statistics, bitstone will account for the more than 35% of total silica amount, and wood fragments charcoal also will account for 20% left and right of charcoal amount.These refining silicon wastes are idle, caused the very large wasting of resources, and this waste improves the relative cost of unit output greatly; And in smelting process, also have a large amount of solid waste SILICA FUME (ω (Si) >=95%) to produce, and if the insufficient utilization of these SILICA FUME also can cause a large amount of wastings of resources and production cost to rise.In addition, in smelting cost, consider, the price of charcoal is relatively high, if can use the relatively cheap refinery coke of price or graphite to replace part charcoal, also can make to refine silicon cost and decline to a great extent.But the Relative Size of refinery coke and graphite is thinner, can affect the ventilation property of electric furnace directly into stove.Given this it is very necessary, seeking a kind of technique that these wastes and cheap reductive agent are applied to electric furnace refining silicon preferably.
Summary of the invention
The present invention is theoretical basis and the practical experience for iron-smelting process according to carbonaceous pelletizing, in conjunction with the practical situation of metallic silicon smelting, a kind of novel process of utilizing waste carbonaceous pelletizing refining silicon has been proposed, by electric furnace Production requirement, refining silicon waste is carried out to pre-treatment, batching, pelletizing, oven dry, then added electric furnace refining silicon.
The method of utilizing waste carbonaceous pelletizing refining silicon provided by the invention comprises:
Silicon-containing material, carbon source, binding agent and water are mixed, and be pressed into pelletizing, after pelletizing is dry, join and in electric furnace, refine silicon and produce; Described silicon-containing material comprises one or more in SILICA FUME and ground silica, and in described SILICA FUME, the massfraction of silicon-dioxide is not less than 95%; Described carbon source comprises one or more in wood charcoal powder, petroleum coke powder and Graphite Powder 99.
Described binding agent is of the same race or two or more homogeneity or heterogeneous product (or material) can be linked together, and has class material organic or inorganic, natural or synthetic of sufficient intensity after solidifying.
Preferably, described binding agent comprises soluble silicate and has machine burning mistake type binding agent.
Preferred, described in have machine burning mistake type binding agent to comprise starch.A kind of binding agent is provided in an embodiment of the present invention, and described binding agent comprises water glass, starch and Xylo-Mucine.
Preferred, described binding agent comprises water glass 70～90wt%, starch 0～20wt% and Xylo-Mucine (CMC-Na) 0～10wt%.
Preferably, when adopting bitstone during as raw material, described ground silica be through wet-milling, dried obtain be less than 100 object powder.In the time adopting silica as raw material, because its Relative Size is large, hardness is very high, need to take the method for wet-milling to process, take after drying.In the time adopting SILICA FUME as raw material, because SILICA FUME granularity is very thin, do not need to process its pelletizing of can directly preparing burden.
Preferably, the mass ratio of described silicon-containing material, carbon source and water is 60-70:20-40:8-10.
Preferred, the granularity of described wood charcoal powder is below 3.15mm.Because wood fragments carbon granule degree is relatively little, hardness is lower, can adopt dry grinding; If but its moisture is relatively high, the method that also can take dry grinding to add wet-milling is carried out, and takes after drying.
The granularity of described refinery coke or Graphite Powder 99 is thinner, does not need process or simply dry grind, and just can directly carry out pelletizing batching.
While mixing with pressure ball, according to the character of raw material, silicon-containing material (bitstone powder, SILICA FUME) and carbon source (wood fragments powdered carbon, petroleum coke powder or Graphite Powder 99) are mixed between two according to a certain percentage or comprehensively mixed in mixer, raw material is mixed, add again appropriate binding agent and water, evenly batch mixing.Select suitable one-tenth ball pressure (20～30MPa) and the balling-up granularity (φ 20～80mm) of pair roller ball press, will mix material compacting balling-up.
When carbonaceous pelletizing enters stove, should select reasonably to refine silicon waste carbonaceous pelletizing add-on and distributing mode, the pelletizing of making is added in electric furnace and smelted by material loading cloth system, to obtain the best effect of electric furnace application carbonaceous pelletizing refining silicon.
Refining silicon according to the inventive method produces, the gap of its silicon-containing material and reductive agent is reduced to micron order, reaction interface expands, speed of response is accelerated, its reductive agent consumption and reaction times will significantly reduce, be conducive to the shortening of production cycle, thereby can reach energy-saving and emission-reduction, reduce costs the object of utilizing resource with comprehensive high-efficiency.
Brief description of the drawings
Fig. 1, utilize waste carbonaceous pelletizing silicon-extracting technology schema.
Embodiment
Below in conjunction with specific examples, the present invention is carried out to concise and to the point supplementing and effect commentary.
Embodiment 1
Referring to Fig. 1, by SILICA FUME according to the ratio of massfraction 62% with addition of 26% Graphite Powder 99, with 2% binding agent, 10% water, after mixing, be pressed into the pelletizing of φ 40mm, the ratio taking total raw material proportioning 5% after being dried joins electric furnace centre (electric furnace centre carbonaceous pelletizing ratio is as 50%) by electric furnace center material pipe.Production data shows and singly has a daily output of 42.80 tons, and unit output power consumption is 11955.97 degree, compares 41.12 tons of daily outputs that use traditional proportioning to smelt gained completely, and unit power consumption 12318.64 is spent, and has clear superiority.
Embodiment 2
To be milled to bitstone powder below 100 orders according to the ratio of massfraction 64%, with addition of 25% the petroleum coke powder below 3.15mm that is milled to, with 3% binding agent, 8% water, after mixing, be pressed into the pelletizing of φ 40mm, the ratio taking total raw material proportioning 10% after being dried joins electric furnace centre (electric furnace centre carbonaceous pelletizing ratio is as 100%) by electric furnace center material pipe.Production data demonstration singly has a daily output of 43.65 tons, and unit output power consumption is 12105.33 degree.Equally, compare the data that use traditional proportioning to smelt gained completely, with the obvious advantage.
Above-mentioned application example products obtained therefrom is chemically examined.Obtain ω (Si) >=99.5%, ω (Fe)≤0.2%, the Pure Silicon Metal of ω (Al)≤0.16%, metallurgical effect is good.It serves to show these raw materials in small, broken bits pressure ball after rational proportion mixes, send into the novel process of electrosmelting, not only be beneficial to and improve product quality and yield, expand raw material sources, reduce costs, and can greatly reduce energy consumption, the raising silicon production efficiency that Pure Silicon Metal is produced, having obtained good result aspect refining silicon recycling waste, ensure the Synchronous lifting of economic benefit and social benefit.
Claims (8)
1. a method of utilizing waste carbonaceous pelletizing refining silicon, comprising:
Silicon-containing material, carbon source, binding agent and water are mixed, and be pressed into carbonaceous pelletizing, after pelletizing is dry, join and in electric furnace, refine silicon and produce; Described silicon-containing material comprises one or more in SILICA FUME and ground silica, and in described SILICA FUME, the massfraction of silicon-dioxide is not less than 95%; Described carbon source comprises one or more in wood charcoal powder, petroleum coke powder and Graphite Powder 99.
2. method according to claim 1, is characterized in that, described binding agent comprises soluble silicate and has machine burning mistake type binding agent.
3. method according to claim 2, is characterized in that, described in have machine burning mistake type binding agent to comprise starch.
4. method according to claim 1, is characterized in that, when adopting bitstone during as raw material, described ground silica be through wet-milling, dried obtain be less than 100 object powder.
5. method according to claim 1, is characterized in that, the mass ratio of described silicon-containing material, carbon source and water is 60-70:20-40:8-10.
6. method according to claim 1, is characterized in that, the granularity of described wood charcoal powder is below 3.15mm.
7. method according to claim 1 and 2, is characterized in that, when compacting balling-up, pressure is 20～30MPa.
8. method according to claim 1 and 2, is characterized in that, the granularity of the carbonaceous pelletizing of compacting balling-up is at φ 20～80mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410294993.8A CN104098099A (en) | 2014-06-25 | 2014-06-25 | Method utilizing waste carbon-containing pellets to smelt silicon |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410294993.8A CN104098099A (en) | 2014-06-25 | 2014-06-25 | Method utilizing waste carbon-containing pellets to smelt silicon |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104098099A true CN104098099A (en) | 2014-10-15 |
Family
ID=51666697
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410294993.8A Pending CN104098099A (en) | 2014-06-25 | 2014-06-25 | Method utilizing waste carbon-containing pellets to smelt silicon |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104098099A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106219550A (en) * | 2016-07-25 | 2016-12-14 | 刘成成 | A kind of method utilizing industrial waste SILICA FUME to prepare industrial silicon and production system |
| CN109705944A (en) * | 2019-02-13 | 2019-05-03 | 新疆西部合盛硅业有限公司 | A kind of coal briquette bond of industrial silicon furnace, moulded coal and preparation method thereof |
| CN113697814A (en) * | 2021-09-17 | 2021-11-26 | 兰州理工大学 | Production method of carbon-silicon composite pellets for industrial silicon and silicon-series ferroalloy production |
| CN114438315A (en) * | 2022-02-10 | 2022-05-06 | 贵州理工学院 | Formula of micro silicon powder pellet binder |
| CN115011794A (en) * | 2022-06-27 | 2022-09-06 | 中南大学 | Binder for forming silica fume, and preparation method and application thereof |
| CN116023069A (en) * | 2022-12-22 | 2023-04-28 | 杭州星科元祥能源有限公司 | Silica particle binder, preparation method, application and preparation method of silica spheres |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102627281A (en) * | 2012-04-27 | 2012-08-08 | 羊实 | Method for smelting metal silicon by using recycled silicon fines |
| CN102786054A (en) * | 2012-09-07 | 2012-11-21 | 昆明冶金研究院 | Method for reduction smelting of microsilica |
-
2014
- 2014-06-25 CN CN201410294993.8A patent/CN104098099A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102627281A (en) * | 2012-04-27 | 2012-08-08 | 羊实 | Method for smelting metal silicon by using recycled silicon fines |
| CN102786054A (en) * | 2012-09-07 | 2012-11-21 | 昆明冶金研究院 | Method for reduction smelting of microsilica |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106219550A (en) * | 2016-07-25 | 2016-12-14 | 刘成成 | A kind of method utilizing industrial waste SILICA FUME to prepare industrial silicon and production system |
| CN109705944A (en) * | 2019-02-13 | 2019-05-03 | 新疆西部合盛硅业有限公司 | A kind of coal briquette bond of industrial silicon furnace, moulded coal and preparation method thereof |
| CN113697814A (en) * | 2021-09-17 | 2021-11-26 | 兰州理工大学 | Production method of carbon-silicon composite pellets for industrial silicon and silicon-series ferroalloy production |
| CN114438315A (en) * | 2022-02-10 | 2022-05-06 | 贵州理工学院 | Formula of micro silicon powder pellet binder |
| CN115011794A (en) * | 2022-06-27 | 2022-09-06 | 中南大学 | Binder for forming silica fume, and preparation method and application thereof |
| CN116023069A (en) * | 2022-12-22 | 2023-04-28 | 杭州星科元祥能源有限公司 | Silica particle binder, preparation method, application and preparation method of silica spheres |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104098099A (en) | Method utilizing waste carbon-containing pellets to smelt silicon | |
| CN103667742B (en) | Treatment method of laterite-nickel ore | |
| CN102260510B (en) | Coke by adding long flame coal and coking method | |
| CN103708455A (en) | Method for preparing calcium carbide | |
| CN104140102B (en) | For preparing binding agent and the preparation method of pelletizing of refining silicon garbage carbonaceous pelletizing | |
| CN104556039A (en) | Method for preparing solid calcium carbide | |
| CN104259470A (en) | Production method of low apparent density and high fine powder ratio 100-mesh reduced iron powder | |
| CN108149010A (en) | Low burn consumption pelletizing binder and preparation method thereof | |
| CN102399978A (en) | Manufacture method of iron ore MgO pellet ore | |
| CN106186740B (en) | A method of utilizing one one-step baking highly-purity magnesite of magnesite concentrate | |
| CN103966426B (en) | A kind of heating using microwave pyrolusite is prepared the method for MnO breeze | |
| CN101942561A (en) | Method for preparing aluminum-silicon-ferrum alloy from coal gangue | |
| CN107189796A (en) | The forming method of calcium carbide production raw material | |
| CN102942976A (en) | Method for preparing formed coke with low metamorphic coal as main raw material in microwave field | |
| CN103087795A (en) | Preparation method of formed semicoke for calcium carbide | |
| CN103708459B (en) | Prepare the method for calcium carbide | |
| CN101619251B (en) | Moulded coal binder for melt reduction iron making and application thereof | |
| CN101906534B (en) | Raw material processing technology for smelting ferrosilicon in submerged arc furnace | |
| CN103981377A (en) | Magnesium smelting raw material pellet capable of improving transverse tank magnesium smelting efficiency and preparation method thereof | |
| CN112126778A (en) | Iron ore direct reduction metallurgy method based on 3D printing | |
| CN104988312B (en) | A kind of method that utilization microwave heats Smelting Plant manganeisen | |
| CN103965929B (en) | A kind of method that raising high volatile does not stick bituminous coal consumption in process of coking | |
| CN106564901A (en) | Manufacturing technique for producing lime carbon pellets through pyrolytic semi-coke | |
| CN105018122B (en) | A kind of formed coke preparation method using COREX pulverized coke instead electric furnace steel making carbon raw materials | |
| CN107129792A (en) | The method of compound binding agent and preparation production calcium carbide mixing pelletizing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20141015 |