New Wet Treatment Process of Barite (BaSO_4) using EDTA
使用 EDTA 湿法处理重晶石 (BaSO_4) 的新工艺
基本信息
- 批准号:07455344
- 负责人:
- 金额:$ 4.86万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research (B)
- 财政年份:1995
- 资助国家:日本
- 起止时间:1995 至 1996
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Barite is the major resource for every barium compounds and calcined at 1000-1200゚C in the presence of coke or pitch to convert black ash containing barium sulfide. However, this process needs the treatment of sulfide as a by-product. So, a development of new treatment process of Barite is expected, and this process is required energy conservation and low impact for environment. A new process consisting of leaching barite with an EDTA solution at moderate temperature and precipitating barium sufate under hydrothermal conditions is studied in this work. Barium salt can be prepared directly from the leaching Solutions containing Ba (edta)^<2-> complex as controlled morphology and size distribution without producing troublesome hydrogen sulfide in the process. The process operating between 80-250゚C can use low temperature waste heat and EDTA liberated in the precipitation can be recycled.[Leaching of barite with EDTA solutions]Kinetic study was carried out for processing barite. The leaching rate increased remarkably with temperature and the stirring speed from 450-1100rpm affected little the rate at 60-90゚C.The rate increased twice when the particle size became half. The mechanism could not be analyzed by the shrinking core model even within one hour due to the formation of many and deep cracks on the barite particles with processing the leaching. Consequently a modified model was with proceeding the apparent activation energy was 16kcal/mol. Thus, the rate process is controlled by any chemical reaction.[Precipitation of barite]Ba (edta)^<2-> solutions containing 0.024M [Ba^<2+>]_T and 0.08M [edta]_T were prepared by leaching barite with [edta]/[barite] molar ratio of 1 at 90゚C for 10h. Ten ml of 0.2 or 0.4 M sodium sulfate solution was added to equal volume of the Ba (edta)^<2-> solution and the resulting solution in a glass tube (Duran) was heated in air bath at 180-200゚C for 0-10h. Barium ion precipitated as pillar-like barite
重晶石是各种钡化合物的主要来源,在焦炭或沥青存在下在1000-1200 ℃煅烧以转化含有硫化钡的黑灰。然而,该方法需要处理作为副产物的硫化物。因此,开发节能、环保的重晶石处理新工艺势在必行。研究了中温EDTA浸取重晶石、水热沉钡的新工艺。钡盐可以直接从含有Ba(edta)_2络合物的浸出液中制备<2->,其形貌和粒度分布可控,而在该过程中不产生麻烦的硫化氢。在80-250 ℃之间操作的过程可以使用低温废热,并且沉淀中释放的EDTA可以再循环。[EDTA溶液浸出重晶石]对EDTA溶液浸出重晶石进行了动力学研究。在60-90 ℃范围内,搅拌速度在450- 1100 rpm范围内对浸出速率影响不大,粒度减半时,浸出速率增加一倍。由于重晶石颗粒在浸出过程中形成了许多较深的裂纹,即使在一小时内也不能用收缩核模型来分析其机理。因此,修正后的模型为表观活化能为16 kcal/mol。因此,速率过程由任何化学反应控制。[沉淀重晶石]Ba(edta)_2<2->溶液是在90 ℃下以[edta]/[barite]摩尔比为1浸提重晶石10小时制备的,其中[Ba^<2+>]_T和[edta]_T分别为0.024 M和0.08 M。将10 ml的0.2或0.4M硫酸钠溶液加入到等体积的Ba(edta)2<2->溶液中,并将玻璃管(Duran)中的所得溶液在空气浴中在180-200 ℃下加热0- 10小时。钡离子以柱状重晶石沉淀
项目成果
期刊论文数量(8)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
Akitsugu Okuwaki: "Synthesis of Several Inorganic Materials under Hydrothermal Conditions" Int.Work shop on Soft and Solution Processing for Advanced Materials. (1996)
Akitsugu Okuwaki:“水热条件下几种无机材料的合成”国际先进材料软加工和溶液加工研讨会。
- DOI:
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- 影响因子:0
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- 通讯作者:
A.Okuwaki: "Development of Mineral Processing and Material Synthesis Using Metal Chelates" Proc.Workshop on Solvotghermal & Hydrothermal Reactions. 23. (1996)
A.Okuwaki:“使用金属螯合物进行矿物加工和材料合成的开发”Proc.Workshop on Solvotghermal
- DOI:
- 发表时间:
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- 影响因子:0
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- 通讯作者:
A.Okuwaki: "Synthesis of Several Inorganic Material under Hydrothermal Conditions" Proc.Int.Workshop on Soft and Solution Processing for Advanced Inorganic Materials. 2-5 (1996)
A.Okuwaki:“水热条件下几种无机材料的合成”Proc.Int.先进无机材料软和溶液加工研讨会。
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
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- 通讯作者:
Akitsugu Okuwaki: "Mineral Processing and Material Synthesis Using Metal Chelates" Work Shop on Solvothermal-Hydrothermal Reactions. 10号. 31-41 (1996)
Akitsugu Okuwaki:“使用金属螯合物进行矿物加工和材料合成”溶剂热-水热反应研讨会。10. 31-41 (1996)
- DOI:
- 发表时间:
- 期刊:
- 影响因子:0
- 作者:
- 通讯作者:
A.Okuwaki: "Synyhesis of Several Inorganic Materials under Hydrothermal Conditions" Proc.Int.Workshop on Soft and Solution Processing for Advanced Inorganic Materials. (1996)
A.Okuwaki:“水热条件下几种无机材料的合成”Proc.Int.先进无机材料软和溶液加工研讨会。
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- 影响因子:0
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OKUWAKI Akitsugu其他文献
OKUWAKI Akitsugu的其他文献
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{{ truncateString('OKUWAKI Akitsugu', 18)}}的其他基金
The Development of Recycling Process of Waste PET to TPA and Oxalic Acid by Alkaline Hydrolysis-oxidation
废旧PET碱性水解氧化回收TPA和草酸工艺开发
- 批准号:
07558082 - 财政年份:1995
- 资助金额:
$ 4.86万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
A New Treatment of Rare Earth Ores in Molten Sodium Hydroxide
熔融氢氧化钠处理稀土矿的新方法
- 批准号:
01550585 - 财政年份:1989
- 资助金额:
$ 4.86万 - 项目类别:
Grant-in-Aid for General Scientific Research (C)
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- 批准号:
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$ 4.86万 - 项目类别:
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