镁热还原法制备超细无定形硼粉

1、镁热还原法制备超细无定形硼粉及粗硼粉的提纯

2、关键技术

以一定要求的金属Mg 粉和B 2O 3粉为原料，以一定的物料配比和升温制度条件下，在卧式还原炉中进行还原，得到还原产物后，采用盐酸进行彻底的酸洗，可制备出纯度在90～95%的无定形硼粉。

以镁热还原法制备的粗硼粉（85～92%）为原料，在粗硼粉中配入一定量的B 2O 3粉末，经充分混合后压制成块，装入不锈钢坩埚并置于卧式气氛炉中，温度维持在700～1000℃，炉内通入氩气作为保护气体，经过2～4h 后冷却，将其置于配置好的稀盐酸中除去物料中的可溶物，经过滤、烘干即得到纯度为95～97%的硼粉，其中杂质Mg 、O 、Si 、Fe 含量分别在1.5%、2%、1.0%、0.5%以下。 3、与成果最相关的图片

图1 制备的无定形硼粉和扫描电镜SEM 图

表1 无定形硼粉物理化学性能指标 物理化学性能

粒度/μm 比表面积

/m 2·g 元素含量/% B Mg O Si Fe

其他 数值 <1.0

8～10

95～97

<1.5

<2

<1

<0.5

<0.5

4、社会和经济效益

无定形硼粉是一种高附加值的硼化工产品，92～95%的无定形硼粉市场价格在5000～8000元/kg ，而纯度达到95～97%的无定形硼粉价格超过10000元/kg 。该科研成果的应用将为硼化工企业产生丰厚的经济效益和社会效益。 5、应用情况

该科研成果已经在河北省唐山市某企业得到应用。 6、知识产权

该科研成果发表学术论文6篇，其中SCI收录1篇，EI收录4篇，ISTP收录1篇；申请专利1项（专利申请号：201010130202）。

1. Preparation of Ultra-fine Amorphous Boron Powder and Purification of Crude Boron by Magnesium Thermal Reduction

2. Introduction

Amorphous boron powder that the purity is 90~95% was prepared via heating at a certain ratio of Mg and B 2O 3 powder in furnace and then washing the product with chlorhydric acid.

Mixture of crude boron (85~92%) prepared by magnesium thermal reduction and a certain amounts of B 2O 3 powder was pressed into a block and heated at 700~1000 °C for 2~4 h under an Ar atmosphere. On cooling to room temperature, the product was washed with chlorhydric acid, filtered and dried. Boron powder, purity of 95~97%, was obtained, in which the impurities of Mg, O, Si and Fe are less than 1.5%, 2%, 1.0% and 0.5%, respectively.

3. Figure

Fig. 1 Amorphous boron powder and its SEM

Table 1. Physical and chemical performance of amorphous boron powder Properties

Particle

size/μm

Bet/m 2

·g

Element level/%

B Mg O Si Fe

Others Values

<1.0

8～10 95～97 <1.5

<2

<1

<0.5

<0.5

4. Benefits

Amorphous boron powder is a high addtional value chemical product, 92~95% purity is

5000~8000 RMB/kg and 95~97% purity more than 10000 yuan/kg. The application of this study will bring rich economic and social benefits to boron chemical companies.

5. Application

This study has been used in a company of Tangshan City, Hebei Province. 6. Patent

The study has generated a patent(NO.201010130202) and 6 papers, which include 1 SCI, 4 EI and 1 ISTP.