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boron removal from molten silicon using sodium-based slags

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Journal of Semiconductors 2011年第9期32卷 12-15页

作者：尹长浩胡冰峰黄新明 Donghai JA Solar Technology Co. Ltd.

Slag refining,as an important option for boron removal to produce solar grade silicon（SOG-Si） from metallurgical grade silicon（MG-Si）,has attracted increasing *** this paper,Na_2CO_3-SiO_2 systems were chosen as the sodium-based refining slag materials for boron removal from molten ***,the effect of Al_2O_3 addition for boron removal was studied in detail,which showed that an appropriate amount of Al_2O_3 can help retention of the basicity of the slags,hence improving the boron removal rate.

关键词： polysilicon boron removal slag refining sodium-based slag Al_2O_3

boron removal from metallurgical grade silicon by slag refining based on GA-BP neural network

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Rare Metals 2021年第1期40卷 237-242页

作者： Shi-Lai Yuan Hui-Min Lu Pan-Pan Wang Chen-Guang Tian Zhi-Jiang Gao School of Materials Science and Engineering.Beijing University of Aeronautics and Astronautics Beijing 100191China

In order to investigate the boron removal effect in slag refining process,intermediate frequency furnace was used to purify boron in SiO2-CaO-Na3 AlF6-CaSiO3 slag system at 1,550℃,and back propagation(BP)neural network was used to model the relationship between slag compositions and boron content in SiO2-CaO-Na3 AlF6-CaSiO3 slag *** BP neural network predicted error is below 2.38%.The prediction results show that the slag composition has a significant influence on boron *** the basicity of slag by adding CaO or Na3 AlF6 to CaSiO3-based slag could contribute to the boron removal,and the addition of Na3 AlF6 has a better removal effect in comparison with the addition of *** oxidizing characteristic of CaSiO3 results in the ineffective removal with the addition of *** increase of oxygen potential(pO2)in the CaO-Na3 AlF6-CaSiO3 slag system by varying the SiO2 proportion can also contribute to the boron removal in silicon *** best slag composition to remove boron was predicted by BP neural network using genetic algorithm(GA).The predicted results show that the mass fraction of boron in silicon reduces from 14.0000×10-6 to0.4366×10-6 after slag melting using 23.12%SiO2-10.44%CaO-16.83%Na3 AlF6-49.61%CaSiO3 slag system,close to the experimental boron content in silicon which is below 0.5×10-6.

关键词： Metallurgical grade silicon boron removal Slag system Genetic algorithm-back propagation neural network

boron removal from brine by XSC-700

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Journal of Central South University 2012年第10期19卷 2768-2773页

作者：肖湘陈白珍石西昌陈亚 School of Metallurgical Science and Engineering Central South University

Brine,which is used to produce high-purity magnesia,was purified by XSC-700 to remove *** adsorption capacity of XSC-700 was investigated by varying the initial boron concentration,temperature,resin/brine ratio and stirring speed,while keeping the diameter at *** results show that boron adsorption capacity increases with increasing boron concentration,temperature,and decreases with increasing resin/brine *** the stirring speed could slightly affect the boron adsorption *** adsorption kinetics obeys the pseudo-second-order *** data were both examined by Freundlich and Langmuir isotherm equations and it can be well represented by the Freundlich isotherm equation.

关键词： boron removal brine adsorption ion exchange XSC-700 resin kinetics isotherms

Fertilizer drawn forward osmosis as an alternative to 2nd pass seawater reverse osmosis: Estimation of boron removal and energy consumption

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Frontiers of Environmental Science & Engineering 2021年第6期15卷 433-445页

作者： Hailan Wang Baoyu Gao Li’an Hou Ho Kyong Shon Qinyan Yue Zhining Wang Shandong Key Laboratory of Water Pollution Control and Resource Reuse School of Environmental Science and EngineeringShandong UniversityJinan 250100China School of Civil and Environmental Engineering University of TechnologySydney(UTS)Broadway NSW 2007Australia

Agriculture is the largest consumer of *** seawater is an important alternative water source for sustainable ***,some issues of the current desalination technology hinder its use for agriculture irrigation,including low boron removal and high energy *** study systematically explored the feasibility of employing fertilizer drawn forward osmosis(FDFO)as an alternative to 2nd pass reverse osmosis(RO)by considering the boron removal performance and specific energy consumption(SEC).Different operating conditions were investigated,such as the boron and NaCl concentrations in feed solution(FS),draw solution(DS)concentration,pH,the volume ratio of FS to DS,membrane orientation,flow rate,and operating *** results indicated that a low boron concentration in FS and high DS pH(pH=11.0)decreased the boron solute flux,and led to low final boron concentration in the *** other operating conditions had negligible influence on the final DS boron ***,a lower flow rate and higher specific water flux with certain permeate water volumes were conducive to reducing the SEC of the FDFO ***,our study paves a new way of using FDFO in irrigation,which avoids the phytotoxicity and human health risk of *** results show the potential of FDFO as an alternative to 2nd pass RO for irrigation water production.

关键词： Fertilizer drawn forward osmosis(FDFO) boron removal Specific energy consumption(SEC) Seawater reverse osmosis(SWRO) Irrigation water production

boron removal from molten silicon using CaO-SiO_2-BaO-CaF_2 slag

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Transactions of Nonferrous Metals Society of China 2016年第12期26卷 3299-3304页

作者： Jin-ling SUN Jin-chuan JIE Qing-chuan ZOU Li-juan GUO Zhi-qiang CAO Tong-min WANG Ting-ju LI School of Materials Science and Engineering Dalian University of Technology Dalian 116024 China TDK Dalian Corporation Dalian 116024 China

The distribution coefficient (LB) of boron between CaO?SiO2?BaO?CaF2 slag and silicon was investigated usingelectromagnetic induction melting for the purpose of improving the boron removal fraction. The dependence of the borondistribution coefficient between slag and silicon on the fundamental parameters of CaO to SiO2 mass ratio and refining time and theadditions of BaO and CaF2 to the slag was discussed. The results show that LB can be increased by adding BaO and CaF2 toCaO?SiO2 slag. The maximum value of LB (6.94) is obtained when the CaO to SiO2 mass ratio is 1.1:1 and the contents of BaO andCaF2 are fixed at 15% and 20%, respectively. Increasing the refining time increases the LB. After the slag treatment is performedtwice, the boron content of the silicon is successfully reduced from 3.5×10?5 to 3.7×10?6, and the removal fraction of boron reaches89.4%.

关键词： metallurgical silicon boron removal CaO-SiO2-BaO-CaF2

boron removal from metallurgical silicon using CaO-SiO_2-CaF_2 slags

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Transactions of Nonferrous Metals Society of China 2011年第6期21卷 1402-1406页

作者：蔡靖李锦堂陈文辉陈朝罗学涛厦门大学材料学院材料科学与工程系厦门361005 厦门大学物理与机电工程学院物理学系厦门361005

The removal of boron from metallurgical silicon in slag system of CaO-SiO2-10%CaF2 was investigated. The partition coefficient of boron （LB） between slag and silicon phase was studied under different conditions of slag basicity （CaO/SiO2 ratio）, temperature, mass ratio of slag to silicon and gas blowing. The results show that LB has a maximum value of 4.61 when the CaO/SiO2 mass ratio is around 2 at l 873 K. The logarithm of LB is linear to the reciprocal of temperatures in the range of 1 773-1 973 K. LB increases with the increase of mass ratio of slag to silicon, but it does not increase markedly when the ratio excesses 3. Gas blowing can sionificantlv increase the removal of boron, and LR increases with the increase of water vapor content.

关键词： solar grade silicon slag treatment boron removal partition coefficient

boron removal in purifying metallurgical grade silicon by CaO-SiO_2 slag refining

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Transactions of Nonferrous Metals Society of China 2014年第4期24卷 1231-1236页

作者：伍继君李彦龙马文会魏奎先杨斌戴永年昆明理工大学复杂有色金属资源清洁利用省部共建国家重点实验室/真空冶金国家工程实验室昆明650093 昆明理工大学云南省有色金属真空冶金重点实验室昆明650093 昆明理工大学云南省高校硅冶金与硅材料工程研究中心昆明650093

boron removal from metallurgical grade silicon （MG-Si） using a calcium silicate slag was studied. The results show that it is impossible basically to remove boron using a pure SiO2 refining. The oxidizing ability of CaO-SiO2 slag for boron removal was characterized by establishing the thermodynamic relationship between the distribution coefficient of boron （LB） and the activities of SiO2 and CaO. The experimental results show that the distribution coefficient and the removal efficiency of boron are greatly improved with the increase of CaO proportion in the slag. The maximal value of LB reaches 1.57 with a slag composition of 60%CaO-40%SiO2 （mass fraction）. The boron content in the refined silicon is reduced from 18×10^-6 to 1.8×10^-6 using slag refining at 1600 ℃ for 3 h with a CaO-SiO2/MG-Si ratio of 2.5, and the removal efficiency of boron reaches 90%.

关键词： metallurgical grade silicon boron removal thermodynamics distribution coefficient slag refining

Mechanism of boron removal from Si-Al melt by Ar-H_2 gas mixtures

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Transactions of Nonferrous Metals Society of China 2016年第11期26卷 3046-3051页

作者：李京伟白枭龙班伯源何秋湘陈健中国科学院应用技术研究所新型薄膜太阳能电池重点实验室合肥230031

A new method about purification of metallurgical grade silicon （MG-Si） by a combination of Si-Al solvent refining andgas blowing treatment was proposed. The morphologies and transformation of impurity phases, especially for boron and iron in Si-Al melt were investigated during Ar-H2 gas blowing treatment. The mechanism of boron removal was discussed. The resultsindicate that gas blowing can refine grain size and increase nucleation of the primary Si. boron can be effectively removed fromMG-Si using the Ar-H2 gas blowing technique during the Si-Al solvent refining. Compared with the sample without gas blowing,the removal efficiency of boron increases from 45.83% to 74.73% after 2.5 h gas blowing. The main impurity phases containingboron are in the form of TiB2, AlB2 and VB compounds and iron-containing one is in the form of β-Al5FeSi intermetallic *** of boron combines [H] to transform into gas BxHy （BH, BH2） and diffuses towards the surface of the melt and is volatilized byAr-H2 gas blowing treatment under electromagnetic stirring.

关键词： metallurgical grade silicon Si-Al melt gas blowing boron removal

Surface Functionalization of Microporous Polypropylene Membrane with Polyols for removal of boron Acid from Aqueous Solution

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Chinese Journal of Chemical Engineering 2014年第1期22卷 11-18页

作者：周蓉狄玲王苍方艳吴健徐志康 MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Department of Chemistry Zhejiang University

Affinity membranes are fabricated for boric acid removal by the surface functionalization of microporous polypropylene membrane(MPPM)with lactose-based *** affinity is based on specific complexation between boric acid and saccharide polyols.A photoinduced grafting-chemical reaction sequence was used to prepare these affinity ***(2-aminoethyl methacrylate hydrochloride)[poly(AEMA)]was grafted on the surfaces of MPPM by UV-induced graft *** in the membrane pores was visualized by dying the cross-section of poly(AEMA)-grafted MPPM with fluorescein disodium and imaging with confocal laser scanning *** is concluded that lactose ligands can be covalently immobilized on the external surface and in the pores by the subsequent coupling of poly(AEMA)with lactobionic acid(LA).Physical and chemical properties of the affinity membranes were characterized by field emission scanning electron microscopy and Fourier Transform Infrared/Attenuated Total Refraction spectroscopy(FT-IR/ATR).3-Aminophenyl boric acid(3-APBA)was removed from aqueous solution by a single piece of lactose-functionalized MPPM in a dynamic filtration *** results show that the 3-APBA removal reaches an optimal efficiency(39.5%)under the alkaline condition(pH9.1),which can be improved by increasing the immobilization density of *** of these affinity membranes can be easily realized through acid-base washing because the complexation of boric acid and saccharide polyol is reversible.

关键词： surface functionalization affinity membrane microporous polypropylene membrane boron removal polyols