scholarly journals Effects of Slag Treatment Conditions on Boron Removal from Metallurgical Silicon by United Gas-slag Refining Technology

2021 ◽  
Author(s):  
Qi-liang Wang ◽  
Jijun Wu ◽  
Shuang-feng Qian ◽  
Hua-zhen Gu ◽  
Zhen-fei Xia ◽  
...  
Keyword(s):  
Boron Content ◽  
Raw Materials ◽  
Impurity Content ◽  
Silicon Powder ◽  
Boron Removal ◽  
Mixed Gas ◽  
Boron Powder ◽  
Slag Refining ◽  
Metallurgical Silicon ◽  
Removal Of Impurities

Abstract Impurities in industrial silicon strongly affect the performance and use value of silicon products, so that raw industrial silicon must be refined to reduce the impurity content and improve its quality. In this work, the effect of the conditions of the refining process on the removal of impurities was studied. The slag agent and industrial silicon powder are uniformly mixed, and a mixed gas of Ar-H 2 O-O 2 is blown into the melt for refining experiments when the set refining temperature is reached. 3% mass fraction high-purity boron powder is pre-melted into industrial silicon raw materials to prepare Si-3%B alloy raw materials, and then the Si-3%B alloy raw materials are refined and pickled with CaO-SiO 2 -CaCl 2 . The composition of the slag agent, the slag-agent-to-silicon mass ratio, the refining time, and the refining temperature conditions were explored, and the best efficiency of boron removal was found to be 96.77%, with the boron content in silicon decreased from 22 ppmw to the lowest value of 0.6 ppmw. The boron content in refined silicon shows a clear decrease, demonstrating that slag-making gas blowing refining is effective for the removal of impurities in industrial silicon.

scholarly journals Effects of Slag Treatment Conditions on Boron Removal from Metallurgical Silicon by United Gas-Slag Refining Technology

Silicon ◽  
2021 ◽  
Author(s):  
Qi-liang Wang ◽  
Ji-jun Wu ◽  
Shuang-feng Qian ◽  
Hua-zhen Gu ◽  
Zhen-fei Xia ◽  
...  
Keyword(s):  
Boron Removal ◽  
Slag Refining ◽  
Metallurgical Silicon ◽  
Treatment Conditions ◽  
Slag Treatment

scholarly journals Properties and application of carbon composite brick for blast furnace hearth

2015 ◽  
Vol 51 (2) ◽  
pp. 143-151 ◽  
Author(s):  
K.X. Jiao ◽  
J.L. Zhang ◽  
Z.J. Liu ◽  
Y.G. Zhao ◽  
X.M. Hou
Keyword(s):  
Blast Furnace ◽  
Chemical Composition ◽  
Raw Materials ◽  
Protective Layer ◽  
Silicon Powder ◽  
Slag Layer ◽  
Carbon Composite ◽  
Carbon Layer ◽  
Furnace Hearth ◽  
Blast Furnace Hearth

A type of carbon composite brick was produced via the microporous technique using natural flack graphite, ?-Al2O3 and high-quality bauxite chamotte (Al2O3?87 mass%) as raw materials with fine silicon powder as additive. The composition and microstructure of the obtained carbon composite were characterized using chemical analysis, XRD and SEM with EDS. The high temperature properties of thermal conductivity, oxidization and corrosion by molten slag and hot metal of the composite were analyzed. Based on these, the type of carbon composite brick worked in a blast furnace hearth for six years was further sampled at different positions. The protective layer was found and its chemical composition and microscopic morphology were investigated. It is found that the carbon composite brick combines the good properties of both the conventional carbon block and ceramic cup refractory. The protective layer near the hot face consists of two separated sublayers, i.e. the slag layer and the carbon layer. A certain amount of slag phase is contained in the carbon layer, which is caused by the reaction of coke ash with the refractory. No obvious change in the chemical composition of the protective layer along the depth of the sidewall is found. This work provides a useful guidance for the extension of the lifetime of blast furnace hearths.

Boron removal in purifying metallurgical grade silicon by CaO–SiO2 slag refining

2014 ◽  
Vol 24 (4) ◽  
pp. 1231-1236 ◽  
Author(s):  
Ji-jun WU ◽  
Yan-long LI ◽  
Wen-hui MA ◽  
Kui-xian WEI ◽  
Bin YANG ◽  
...  
Keyword(s):  
Boron Removal ◽  
Metallurgical Grade Silicon ◽  
Slag Refining ◽  
Grade Silicon

Development of Composite Antifreeze to Ecological Slope Protection Substrate

2013 ◽  
Vol 827 ◽  
pp. 355-359
Author(s):  
Huan Hu ◽  
Ming Tao Zhou ◽  
Xu Dong Hu
Keyword(s):  
Elastic Modulus ◽  
Raw Materials ◽  
Surface Active Agent ◽  
Active Agent ◽  
Silicon Powder ◽  
Powder Surface ◽  
Palm Fiber ◽  
Freeze Thaw ◽  
Surface Active ◽  
Cement Soil

Referring to the antifreeze improved test of cement-soil and combining with its own characteristics and functions of the ecological slope protection material, the paper selects palm fiber, silicon powder and surface active agent as the antifreeze raw materials to the ecological slope protection substrate. Based on the method of antifreeze on concrete, through the evaluation of relative dynamic elastic modulus and mass loss rates in the process of freeze-thaw cycles, the results show that the best composite antifreeze to improve the frost resistance property of the ecological slope protection substrate is that palm fiber: silicon powder: surface active agent=1:3:0.05. While the additive amount reaches 1.5% by weight of the dry ecological slope protection substrate, the best effect will be obtained.

Mathematical Modeling оf the Silicon Production Process from Pelletized Charge

2020 ◽  
Vol 989 ◽  
pp. 394-399
Author(s):  
Nina V. Nemchinova ◽  
Andrey A. Tyutrin ◽  
Sergei N. Fedorov
Keyword(s):  
Chemical Composition ◽  
Crystalline Silicon ◽  
Raw Materials ◽  
Smelting Process ◽  
Aluminum Production ◽  
Molten Silicon ◽  
Product Modeling ◽  
Silicon Phase ◽  
Silicon Production ◽  
Metallurgical Silicon

The paper considers the problem of recycling the dust waste resulting from metallurgical silicon production; such dust contains considerable amounts of valuable silica. The problem is solved by redirecting this byproduct to the silicon smelting process. We herein propose using the dust left in silicon and aluminum production as a component of pelletized charge, used for silicon smelting in ore-thermal furnaces (OTF). Mathematical (physico-chemical) modeling was applied to study the behavior of pelletized-charge components, in order to predict the chemical composition of smelting-produced silicon. We generated a model that simulated the four temperature zones of a furnace, as well as the crystalline-silicon phase (25°С). The model contained 17 elements entering the furnace, due to being contained in raw materials, electrodes, and the air. Modeling produced molten silicon, 91.73 wt% of which was the target product. Modeling showed that, when using the proposed combined charge, silicon extraction factor would amount to 69.25%, which agrees well with practical data. Results of modeling the chemical composition of crystalline silicon agreed well with the chemical analysis of actually produced silicon.

In flight treatment of metallurgical silicon powder by RF thermal plasma: elaboration of hydrogenated silicon deposit on a substrate

2002 ◽  
Vol 403-404 ◽  
pp. 112-115 ◽  
Author(s):  
M Benmansour ◽  
E Francke ◽  
D Morvan ◽  
J Amouroux ◽  
D Ballutaud
Keyword(s):  
Thermal Plasma ◽  
Silicon Powder ◽  
Hydrogenated Silicon ◽  
Metallurgical Silicon ◽  
Rf Thermal Plasma

scholarly journals Phase Equilibrium Diagram for Electric Arc Furnace Slag Optimization in High Alloyed Chromium Stainless Steelmaking

Metals ◽  
2020 ◽  
Vol 10 (6) ◽  
pp. 826 ◽  
Author(s):  
Marcus Kirschen ◽  
In-Ho Jung ◽  
Gernot Hackl
Keyword(s):  
Raw Materials ◽  
Equilibrium Diagram ◽  
Electric Arc Furnace ◽  
Electric Arc ◽  
Special Focus ◽  
Arc Furnace ◽  
Monitoring And Control ◽  
Refractory Wear ◽  
Slag Refining ◽  
Electric Arc Furnace Slag

The electric arc furnace (EAF) process for steelmaking of Cr and Ni high alloyed stainless steel grades differs significantly from the steelmaking process of carbon steel due to the special raw materials and generally lower oxygen consumption. The special slag chemistry in the EAF process affects slag foaming and refractory wear characteristics due to an increased content of CrOx. A special slag diagram is presented in order to improve monitoring and control of slag compositions for Cr alloyed heats, with special focus on saturation to MgO periclase and dicalcium silicate C2S in order to minimize MgO losses from the refractory lining and to improve slag refining capability by avoidance of stable C2S. With the same diagram different EAF process strategies can be efficiently monitored, either at elevated CaO and basicity with lower spinel concentration and more liquid process slags near C2S saturation or at lower CaO content and basicity with increased spinel concentration and stiffer slags at MgO saturation but certainly no C2S stability. Examples for three industrial EAFs are given.

Influence of the Binder Amount on the Properties of the Non-Sintering Ti(C,N)-Si3N4-SiC Composite Refractories

2013 ◽  
Vol 833 ◽  
pp. 221-224 ◽  
Author(s):  
Bo Tan ◽  
Kai Chen ◽  
Zhao Hui Huang ◽  
Ming Hao Fang ◽  
Yan Gai Liu ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Phenolic Resin ◽  
Raw Materials ◽  
Silicon Powder ◽  
Volume Shrinkage ◽  
Natural Quartz ◽  
Complex Binder ◽  
Degradation Of Properties ◽  
Silicon Carbide Particles ◽  
Carbide Particles

The non-sintering Ti (C,N)-Si3N4-SiC composite refractories were prepared using natural quartz, rutile and silicon carbide particles/powders as the raw materials, phenolic resin and urotropin as a complex binder and silicon powder as the additive. The influence of the binder amount on the density, flexural strength, volume shrinkage and the microstructure of the non-sintering Ti (C,N)-Si3N4-SiC composite refractories was studied in detail. The results showed that the amount of binder has significant effects on the properties of the non-sintering Ti (C,N)-Si3N4-SiC composite refractories. The bulk density decreased and the apparent porosity increased as the amount of binder increased, and the flexural strength increased and then decreased as the amount of binder increased, and the volume shrinkage increased with the increase of the amount of binder. The binder is propitious to the properties of the non-sintering Ti (C,N)-Si3N4-SiC composite refractories, but excessive binder will result in the degradation of properties of the as-fabricated composite refractories, the optimum amount of complex adhesive is 15%.

Boron Removal from Metallurgical Silicon using Si-Al-Sn Ternary Alloy

2014 ◽  
Vol 49 (2) ◽  
pp. 305-310 ◽  
Author(s):  
Fumin Xu ◽  
Shenrui Wu ◽  
Yi Tan ◽  
Jiayan Li ◽  
Yaqiong Li ◽  
...  
Keyword(s):  
Ternary Alloy ◽  
Boron Removal ◽  
Metallurgical Silicon

Effect of Sintering Temperatures on the Reaction-Bonded Si3N4/SiC Composite Ceramics

2011 ◽  
Vol 399-401 ◽  
pp. 331-335 ◽  
Author(s):  
Jun Li ◽  
Wen Jie Yuan ◽  
Shuo Wang ◽  
Hong Xi Zhu ◽  
Cheng Ji Deng
Keyword(s):  
Compressive Strength ◽  
Raw Materials ◽  
Silicon Powder ◽  
Processing Parameters ◽  
Nitrogen Atmosphere ◽  
Particle Sizes ◽  
Composite Ceramics ◽  
Strength Tests ◽  
Different Temperatures ◽  
Microstructure And Mechanical Property

Effect of sintering temperatures on reaction-bonded Si3N4/SiC composite ceramics under pressureless was investigated. Si3N4/SiC composite ceramics were sintered at different temperatures from 1450 to 1700 °C under nitrogen atmosphere by using SiC with different particle sizes, Si and additives Y2O3 as raw materials. The phases, microstructure and mechanical property were characterized by XRD, SEM, and compressive strength tests. The results demonstrated that when the particle gradation consists of silicon carbide of 74 μm (5 wt.%), 44 μm (10 wt.%) and 0.5 μm(35 wt.%) and silicon powder of 74 μm (42 wt.%), the more dense samples with the bulk density of 2.43 g/cm3 and the higher compressive strength of 324 MPa could be obtained at the sintering temperature of 1550 °C for 3h as the optimum processing parameters.

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