Arsenic iron alloy, preparation method and resource treatment method thereof

Patent metadata

Field	Value
Publication number	US-12344922-B2
Application number	US-202418819299-A
Country	US
Kind code	B2
Filing date	Aug 29, 2024
Priority date	Sep 21, 2022
Publication date	Jul 1, 2025
Grant date	Jul 1, 2025

Abstract

The present disclosure provides a preparation method of arsenic iron alloy, which includes the following steps: ball milling arsenic powder and iron powder under the protection of inert atmosphere according to a molar ratio of 0.1˜0.35:1 or 0.35˜2:1 to obtain pretreated material; vacuum hot pressed sintering the pretreated material to obtain arsenic iron alloy. The vacuum hot press sintering process includes: placing the pretreated material in a vacuum environment; and sintering the pretreated material; in the sintering process, a pressure of 30˜50 MPa is applied to the pretreated material. The sintering process includes: heating the pretreated material from room temperature to 400˜500° C., and holding for 0.5˜1 h; and heating the pretreated material from 400˜500° C. to 600˜800° C., and holding for 0.5˜1 h. The present disclosure can obtain arsenic iron alloy with high performance and low leaching toxicity.

First claim

What is claimed is:

1. A preparation method for an arsenic iron alloy, comprising:
ball milling arsenic powder and iron powder under protection of inert atmosphere according to a molar ratio of 0.1-0.35:1 or 0.35-2:1 to obtain pretreated material;
the ball milling process comprising a plurality of ball milling cycles, a ball milling duration of each ball milling cycle being 30 min to 60 min, and an interval duration between two adjacent ball milling cycles being 5 min to 15 min;
in the ball milling process, a rotating speed of the ball milling being 250 r/min to 400 r/min, a weight ratio of ball to material being 10-20:1, and a total time of the ball milling being 8 h to 48 h;
a grain size of the ball used in the ball milling process is selected from one or more of 3 mm, 6 mm, 10 mm, and 15 mm; and
vacuum hot press sintering the pretreated material to obtain arsenic iron alloy;
wherein, the vacuum hot press sintering process comprises:
placing the pretreated material in a vacuum environment; and
sintering the pretreated material; in the sintering process, a pressure of 30-50 MPa being applied to the pretreated material;
wherein the sintering process comprises:
heating the pretreated material from room temperature to 400-500° C., and holding for 0.5-1 h; and
heating the pretreated material from 400-500° C. to 600-800° C., and holding for 0.5-1 h.

2. The preparation method of claim 1 , wherein the arsenic powder and the iron powder are mixed to obtain mixed powder before the ball milling process of the arsenic powder and the iron powder.

3. The preparation method of claim 1 , wherein a purity of the arsenic powder is not less than 98.0 wt. 9%, and a purity of the iron powder is not less than 98.0 wt. %.

4. The preparation method of claim 1 , wherein the inert atmosphere comprises one or more of argon and nitrogen.

Assignees

• Univ Central South

Inventors

• Min Xiaobo
• Chai Fei
• Zhao Feiping
• Chai Liyuan
• Liang Yanjie
• Peng Cong
• Zhou Yiwei

Classifications

• C22C38/002 Primary

  containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60 · CPC title

• C22C33/0278

  with at least one alloying element having a minimum content above 5% · CPC title

• B22F2009/041

  by mechanical alloying, e.g. blending, milling · CPC title

• B22F9/04

  starting from solid material, e.g. by crushing, grinding or milling ({C22C1/1084 takes precedence}; crushing, grinding or milling, in general, see the relevant subclasses, e.g. B02C) · CPC title

• Y02P10/20

  Recycling · CPC title