WO2014183381A1 - 一种碳化硅滤饼碱洗提纯方法 - Google Patents

一种碳化硅滤饼碱洗提纯方法 Download PDF

Info

Publication number
WO2014183381A1
WO2014183381A1 PCT/CN2013/085460 CN2013085460W WO2014183381A1 WO 2014183381 A1 WO2014183381 A1 WO 2014183381A1 CN 2013085460 W CN2013085460 W CN 2013085460W WO 2014183381 A1 WO2014183381 A1 WO 2014183381A1
Authority
WO
WIPO (PCT)
Prior art keywords
silicon carbide
filter cake
water
carbide filter
suspension
Prior art date
Application number
PCT/CN2013/085460
Other languages
English (en)
French (fr)
Inventor
金家善
Original Assignee
Jin Jiashan
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Jin Jiashan filed Critical Jin Jiashan
Publication of WO2014183381A1 publication Critical patent/WO2014183381A1/zh

Links

Classifications

    • CCHEMISTRY; METALLURGY
    • C01INORGANIC CHEMISTRY
    • C01BNON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
    • C01B32/00Carbon; Compounds thereof
    • C01B32/90Carbides
    • C01B32/914Carbides of single elements
    • C01B32/956Silicon carbide

Definitions

  • the invention relates to the technical field of solid-liquid separation of waste mortar, in particular to a silicon carbide filter cake obtained by solid-liquid separation from a single crystal silicon slice waste sand slurry, and then a method for purifying silicon carbide.
  • the waste mortar mainly contains silicon carbide, polyethylene glycol cutting fluid, silicon powder, etc., and the waste mortar is subjected to solid-liquid separation by a filter press to obtain a silicon carbide filter cake (mainly containing silicon carbide, silicon powder, carbon, etc.).
  • the silicon carbide filter cake generally has a silicon carbide content of 80%, a silicon powder content of 15%, a carbon content of 3.5%, and other impurities of 1.5%.
  • sodium hydroxide and silicon powder are required to react to remove the silicon powder.
  • the conventional process is to put the silicon carbide filter cake into water, and then add sodium hydroxide solids in batches to react, during which a large amount of gas is generated, and the temperature is generated. Up to 120 ° C, boiling state, the material is easily sprayed from the reaction tank or the reaction tank, resulting in material loss; the amount of alkali added is several times the amount of silicon powder, resulting in an increase in production costs, the amount of later washing alkali water, sewage The processing cost is high.
  • An object of the present invention is to provide a method for purifying and purifying a silicon carbide filter cake, which is suitable for industrial scale production.
  • the invention adopts silicon carbide filter cake and sodium hydroxide as raw materials, dissolves the silicon carbide filter cake and sodium hydroxide in water respectively, suspends the silicon carbide filter cake into the alkali solution to carry out the silicon removal reaction, and then adds water to carry out the pressure filtration. Until the pH is neutral, a crude wet silicon carbide is obtained.
  • the method for purifying the silicon carbide filter cake by alkali washing the steps of the method are as follows: )) mixing the silicon carbide filter cake with water by a weight ratio of 1 and stirring uniformly; mixing sodium hydroxide with water at 1:2, and stirring uniformly;
  • the initial reaction temperature is 60 ° C and the reaction temperature is 90 ° C.
  • the silicon carbide wet product has a water to mass ratio of 1, and is washed to a pH of 7-8 and a silicon carbide content of 98% or more.
  • the beneficial effects of the present invention are as follows: Compared with the prior art, the present invention adopts a titration reaction method to remove the silicon powder alkali reaction, and suspends the silicon carbide suspension into the alkaline water, the reaction temperature is always controlled at 90 ° C, and the gas is uniformly generated. Will not cause boiling state; greatly reduce the amount of alkali and water, alkali and silicon powder 2: 1 feeding, can fully react, save production costs; after the washing alkali using filter press, fast, water saving, can effectively reduce sewage treatment Cost, shorten the production cycle; The purified silicon carbide content of the invention is above 98%.
  • the silicon carbide filter cake is washed and purified by a titration method, and the reaction temperature is maintained at 90 ° C, and the alkali and silicon powder are fully reacted; the silicon carbide is washed by pressure filtration to greatly reduce the amount of alkali and water, and shorten Production cycle, reducing environmental pollution.
  • the 2000L reaction bottom valve is slowly opened, the silicon carbide filter cake suspension is slowly injected into the 6000L reaction tank, and the silicon powder reacts with the alkali.
  • the temperature is raised from 60 ° C to 90 ° C, the 2000 L reaction bottom valve is closed and opened.
  • the cooling water of the 6000L reactor was kept at a reaction temperature of 90 ⁇ 2 °C for about 3-4 hours.
  • the suspension of the silicon carbide filter cake was completed, and the reaction time in the autoclave was extended for 1 hour.
  • the silicon carbide suspension is put into the plate and frame filter press for pressure filtration to obtain 1050kg of crude wet silicon carbide.
  • the 1050kg wet silicon carbide crude product is put into 1050kg water and stirred evenly.
  • the pressure is filtered again, and the process is repeated 1-2 times until the crude silicon carbide is detected between pH 7-8, and the crude wet silicon carbide is finally obtained as 960kg. %%,
  • the silicon carbide content is 98.2% (calculated as dry product), the yield is 94.27% (calculated as pure silicon carbide).

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Inorganic Chemistry (AREA)
  • Carbon And Carbon Compounds (AREA)

Abstract

提供一种碳化硅滤饼碱洗提纯方法,包括:(1)将碳化硅滤饼与水按重量比以1:1混合并搅拌均匀;将氢氧化钠与水以1:2混合并搅拌均匀;(2)将碳化硅滤饼悬浮液缓慢注入碱水中进行碱反应;(3)将反应后的碳化硅悬浮液按1:1加入水,分别进行3-4次压滤得到碳化硅湿品。经提纯后的碳化硅含量达98%以上。

Description

说 明 书 一种碳化硅滤饼碱洗提纯方法 技术领域
本发明涉及废砂浆的固液分离技术领域, 尤其是一种从单晶硅切片废砂 浆中经固液分离后, 得到的碳化硅滤饼, 再提纯碳化硅的方法。
背景技术
碳化硅 (微粉级) 与聚乙二醇切削液按 5 : 5混合后, 形成碳化硅悬浮 砂浆, 对光伏产品单 (多) 晶硅棒进行切割, 经切割后, 该砂浆可以进行回 收利用, 避免影响环境。 废砂浆中主要含有碳化硅、 聚乙二醇切削液、 硅粉 等, 该废砂浆经过压滤机固液分离后, 得到碳化硅滤饼 (主要含有碳化硅、 硅粉、 碳等)。
碳化硅滤饼一般碳化硅含量 80%、 硅粉含量 15%、 碳含量 3. 5%、 其他杂 质 1. 5%。 在提纯过程中, 需加入氢氧化钠与硅粉进行反应, 从而去除硅粉, 传统工艺是将碳化硅滤饼投入水中, 再分批加入氢氧化钠固体进行反应, 期 间产生大量的气体, 温度高达 120°C, 沸腾状态, 物料容易从反应釜或者反 应池中喷出, 造成物料损失; 加碱量是硅粉量的几倍, 从而造成生产成本上 升, 后道洗碱水用量大, 污水处理成本高。
发明内容
本发明的目的是提供一种碳化硅滤饼碱洗提纯方法,适合工业规模化生 产。 本发明采用以碳化硅滤饼、 氢氧化钠为原料, 将碳化硅滤饼和氢氧化钠 分别溶在水中, 碳化硅滤饼悬浮液滴入碱溶液中进行除硅反应, 再加水进行 压滤, 直至 pH为中性, 得到湿碳化硅粗品。
本发明的目的是通过采用以下技术方案来实现的:
碳化硅滤饼碱洗提纯方法, 所述方法的步骤如下: α)将碳化硅滤饼与水按重量比以 1进行混合, 搅拌均匀; 将氢氧化钠 与水以 1 : 2进行混合, 搅拌均匀;
(2 ) 将碳化硅滤饼悬浮液缓慢注入碱水中, 进行碱反应;
(3 )将反应后的碳化硅悬浮液按 1 : 1加入水, 分别进行 3-4次压滤得到碳 化硅湿品。
作为本发明的优选技术方案, 所述初始反应温度为 60°C, 反应温度为 90°C。
作为本发明的优选技术方案, 所述碳化硅湿品与水质量比 1, 清洗至 pH为 7-8, 碳化硅含量 98%以上。
本发明的有益效果是: 相对于现有技术, 本发明采用滴定式反应方法进 行去除硅粉碱反应, 将碳化硅悬浮液滴入碱水中, 反应温度始终控制在 90 °C, 气体均匀产生, 不会造成沸腾状态; 大大减少碱、 水的用量, 碱与硅粉 2: 1投料, 能充分反应, 节约生产成本; 后道洗碱采用压滤机, 快速、省水, 能够有效降低污水处理成本, 缩短生产周期; 本发明经提纯后的碳化硅含量 达 98%以上。
具体实施方式
碳化硅滤饼碱洗提纯的方法,采用滴定式除硅碱反应,保持反应温度 90 °C, 碱和硅粉充分反应; 采用压滤来进行清洗碳化硅, 大大减少碱、 水的用 量, 缩短生产周期, 减少环境污染。
1、 投料配料
在 2000L反应釜中分别依次加入 1000kg水和 1000kg碳化硅滤饼, 开启 搅拌, 直至碳化硅滤饼完全溶在水中, 形成碳化硅滤饼悬浮液。 在 6000L带 夹套的反应罐中加入 300kg氢氧化钠和 600kg水, 期间会发生溶解放热, 水 温约在 45°C, 开启搅拌并开启夹套蒸汽加热, 至水温在 60 ± 2 °C, 关闭蒸汽 加热, 保持搅拌。
2、 除硅碱反应 将 2000L反应釜底阀缓慢打开,碳化硅滤饼悬浮液缓慢注入 6000L反应 釜中, 硅粉与碱进行反应, 温度从 60°C升至 90°C时, 关小 2000L反应釜底 阀, 打开 6000L反应釜的冷却水, 保持釜内反应温度为 90 ± 2 °C, 约 3-4小 时, 碳化硅滤饼悬浮液滴加完毕, 延长釜内反应时间 1小时。
3、 压滤洗碱
6000L反应釜内延长反应完毕后, 加入 2500kg水, 搅拌均匀, 水溶液 pH值约为 12, 将该碳化硅悬浮液打入板框压滤机内进行压滤, 得湿碳化硅 粗品 1050kg,再将该 1050kg湿碳化硅粗品投入 1050kg水中搅拌均匀,再次 压滤, 依次该工序 1-2次, 直至碳化硅粗品检测 pH值 7-8之间, 最终得到 湿碳化硅粗品为 960kg, 经检测水分 20%, 碳化硅含量为 98. 2% (折合干品计 算), 收率 94. 27% (折合纯碳化硅计算)。

Claims

权 利 要 求 书
1、 一种碳化硅滤饼碱洗提纯方法, 其特征是所述方法的步骤如下:
(1)将碳化硅滤饼与水按重量比以 1进行混合, 搅拌均匀; 将氢氧化钠 与水以 1: 2进行混合, 搅拌均匀;
(2) 将碳化硅滤饼悬浮液缓慢注入碱水中, 进行碱反应;
(3)将反应后的碳化硅悬浮液按 1: 1加入水, 分别进行 3-4次压滤得到碳 化硅湿品。
2、 根据权利要求 1所述的碳化硅滤饼碱洗提纯方法, 其特征是: 所述 初始反应温度为 60°C, 反应温度为 90°C。
3、 根据权利要求 1所述的碳化硅滤饼碱洗提纯方法, 其特征是: 所述 碳化硅湿品与水质量比 1: 1, 清洗至 pH为 7-8, 碳化硅含量 98%以上。
PCT/CN2013/085460 2013-05-16 2013-10-18 一种碳化硅滤饼碱洗提纯方法 WO2014183381A1 (zh)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201310187473.2 2013-05-16
CN2013101874732A CN103241739A (zh) 2013-05-16 2013-05-16 一种碳化硅滤饼碱洗提纯方法

Publications (1)

Publication Number Publication Date
WO2014183381A1 true WO2014183381A1 (zh) 2014-11-20

Family

ID=48921652

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/CN2013/085460 WO2014183381A1 (zh) 2013-05-16 2013-10-18 一种碳化硅滤饼碱洗提纯方法

Country Status (2)

Country Link
CN (1) CN103241739A (zh)
WO (1) WO2014183381A1 (zh)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103241739A (zh) * 2013-05-16 2013-08-14 周彬 一种碳化硅滤饼碱洗提纯方法
CN103922342B (zh) * 2014-03-19 2016-08-17 河南易成新能源股份有限公司 碳化硅微粉旋流提纯方法
CN103922343B (zh) * 2014-03-19 2016-03-09 河南易成新能源股份有限公司 碳化硅切割刃料除铁提纯方法

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102031193A (zh) * 2010-11-02 2011-04-27 薛荣秀 一种从硅片切割废砂浆中回收碳化硅和聚乙二醇切削液的方法
CN102060297A (zh) * 2010-11-26 2011-05-18 临沭山田研磨材有限公司 一种碳化硅微粉和燃料柴油的提取方法
CN102746935A (zh) * 2012-08-02 2012-10-24 无锡和荣科技有限公司 一种硅切割废砂浆回收利用的方法
CN103241739A (zh) * 2013-05-16 2013-08-14 周彬 一种碳化硅滤饼碱洗提纯方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102031193A (zh) * 2010-11-02 2011-04-27 薛荣秀 一种从硅片切割废砂浆中回收碳化硅和聚乙二醇切削液的方法
CN102060297A (zh) * 2010-11-26 2011-05-18 临沭山田研磨材有限公司 一种碳化硅微粉和燃料柴油的提取方法
CN102746935A (zh) * 2012-08-02 2012-10-24 无锡和荣科技有限公司 一种硅切割废砂浆回收利用的方法
CN103241739A (zh) * 2013-05-16 2013-08-14 周彬 一种碳化硅滤饼碱洗提纯方法

Also Published As

Publication number Publication date
CN103241739A (zh) 2013-08-14

Similar Documents

Publication Publication Date Title
CN102492994B (zh) 一种利用白炭黑生产废水制备硫酸钙晶须的方法
CN109019691A (zh) 一种仲钨酸铵的制备工艺
CN100503546C (zh) 从废料中提纯对苯二甲酸的方法
CN104649286A (zh) 一种从硼精矿中生产偏硼酸钠和过硼酸钠的方法
CN101885498A (zh) 一种高纯硫酸镁的制备方法
CN104477960B (zh) 一种钾明矾的生产方法
WO2014183381A1 (zh) 一种碳化硅滤饼碱洗提纯方法
CN105037295A (zh) 一种生产次磺酰胺类橡胶硫化促进剂的方法
CN102923722B (zh) 白炭黑的制备方法
CN105152174B (zh) 一种高纯白炭黑的制备方法
CN106542534A (zh) 一种脱钠剂脱除水合硅酸钙中杂质钠的方法
CN102993026B (zh) 对苯二胺的制备方法
CN102851739B (zh) 一种硫酸钙晶须的制备工艺
CN102838565A (zh) 橡胶硫化促进剂dz的生产方法
CN210711829U (zh) 一种利用柠檬酸石膏生产石膏晶须的***
CN109608417A (zh) 由树脂中回收粗品mbt直接合成促进剂mbts的方法
CN107162919A (zh) 高效节能、环保的新型二氨基二苯醚生产线
CN101759658A (zh) 乙醇重结晶提纯低含量橡胶硫化促进剂mbt的方法
CN101319382B (zh) 以海水卤水为原料的硫酸钙晶须制备方法
CN106632141A (zh) 两滴法生产橡胶硫化促进剂cz的方法
CN109180605A (zh) 废水中树脂直接合成橡胶硫化促进剂tbbs的方法
CN108516556B (zh) 一种利用硅渣制备高纯二氧化硅的方法
CN105348134B (zh) 一种n‑酰基氨基酸的精制纯化方法
CN103739580B (zh) 棕榈酸残渣的处理方法
CN113980046A (zh) 高纯度一甲基三巯基乙酸异辛酯锡热稳定剂的制备方法

Legal Events

Date Code Title Description
121 Ep: the epo has been informed by wipo that ep was designated in this application

Ref document number: 13884559

Country of ref document: EP

Kind code of ref document: A1

NENP Non-entry into the national phase

Ref country code: DE

122 Ep: pct application non-entry in european phase

Ref document number: 13884559

Country of ref document: EP

Kind code of ref document: A1