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1. CN109052407 - Recycling and purification method of silicon cutting waste material

Amt China
Aktenzeichen/Anmeldenummer 201810958782.8
Anmeldedatum 22.08.2018
Veröffentlichungsnummer 109052407
Veröffentlichungsdatum 21.12.2018
Veröffentlichungsart A
IPC
C01B 33/037
CSektion C Chemie; Hüttenwesen
01Anorganische Chemie
BNichtmetallische Elemente; deren Verbindungen
33Silicium; dessen Verbindungen
02Silicium
037Reinigung
CPC
C01B 33/037
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; ; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
33Silicon; Compounds thereof
02Silicon
037Purification
C01P 2006/80
CCHEMISTRY; METALLURGY
01INORGANIC CHEMISTRY
PINDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
2006Physical properties of inorganic compounds
80Compositional purity
Anmelder KUNMING UNIVERSITY OF SCIENCE AND TECHNOLOGY
昆明理工大学
Erfinder WU JIJUN
伍继君
LI XIN
李昕
MA WENHUI
马文会
CHEN ZHENGJIE
陈正杰
WEI KUIXIAN
魏奎先
YAN HENGWEI
颜恒维
LEI YUN
雷云
LI SHAOYUAN
李绍元
XIE KEQIANG
谢克强
Titel
(EN) Recycling and purification method of silicon cutting waste material
(ZH) 一种硅切割废料的回收与提纯方法
Zusammenfassung
(EN)
The invention relates to a recycling and purification method of a silicon cutting waste material and belongs to the technical field of secondary resource circulation utilization of silicon materials.The recycling and purification method comprises the following steps: carrying out solid-liquid separation on silicon waste slurry in a silicon ingot cutting process, and drying to obtain a solid-statesilicon waste material; uniformly mixing CaO, SiO2 and a fluxing agent to obtain a slag-making agent; uniformly mixing the slag-making agent and the solid-state silicon waste material; putting a mixture into a medium frequency induction furnace; vacuumizing and then introducing argon gas; heating to 1450 to 1700 DEG C under an argon gas atmosphere condition and smelting at constant temperature for 0.5 to 4h; cooling along a furnace to obtain a fused block; separating silicon dreg of the fused block by adopting a diamond line cutting method to obtain high-purity silicon. According to the recycling and purification method, a silicon cutting waste material is subjected to slag-making and refining treatment of an induction furnace; separation and purification are carried out in the same operation step, and comprehensive recycling and purification treatment of a silicon-containing waste material in a silicon ingot cutting process is realized; the recycling and purification method has the characteristics of great production capability and high comprehensive recycling rate; wastes are changed into valuable things; the solar power generation cost can be reduced and a solar energy technology is easy to popularize.

(ZH)
本发明涉及一种硅切割废料的回收与提纯方法,属于硅材料的二次资源循环利用的技术领域。本发明将硅锭切割过程产生的硅废浆料进行固液分离并烘干得到固态硅废料;将CaO、SiO2、助熔剂混合均匀得到造渣剂;将造渣剂与固态硅废料混合均匀,并置于中频感应炉中,抽真空然后通入氩气,在氩气氛围条件下加热至温度为1450~1700℃,恒温熔炼0.5~4h,随炉冷却得到熔块;采用金刚石线切割法将熔块的硅渣分离即得高纯硅。本发明利用全火法流程对硅切割废料进行感应炉造渣精炼处理,将分离与提纯放在同一个操作步骤中,实现了硅锭切割过程中含硅废料的综合回收与提纯处理,具有生产能力大、综合回收率高的特点,变废为宝,可降低太阳能发电成本,有利于太阳能技术的推广。