A kind of preparation method of spherical iron powder

An iron powder and spherical technology, applied in the field of preparation of spherical iron powder, can solve the problems of low added value of products, large amount of waste water, influence of stainless steel, etc., and achieve the effects of high added value of products, high recovery rate and low cost.

Active Publication Date: 2021-05-04
王东升
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conventional treatment method is to return this material to the preparation of stainless steel, but there are following problems: due to the different components of stainless steel of different grades, and the oxide scale is often mixed with oxide scales of different grades and different components, the newly prepared stainless steel impact
However, due to the high content of ferric iron, leaching is difficult, the treatment process is long, the cost is high, the amount of waste water is large, and the added value of the product is not high

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • A kind of preparation method of spherical iron powder
  • A kind of preparation method of spherical iron powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A kind of preparation method of spherical iron powder, it is the following steps:

[0039] (1) Grinding the iron oxide scale until the material passes through a 200-mesh sieve, then adding a 7mol / L phosphoric acid solution, reacting at a temperature of 89°C for 4 hours, and then filtering to obtain the first filtrate and the first filter residue; In step (1), the molar ratio of the iron in the oxide skin to the phosphoric acid in the phosphoric acid solution is 1:2.2, and the first filter residue is returned to mix with the oxide skin to continue leaching.

[0040] (2) the first filtrate is added in the P204 extractant, through 6-stage countercurrent extraction, 4-stage countercurrent washing to obtain P204 iron soap, and obtain nickel-containing raffinate after extraction simultaneously; the combination of P204 extractant in the step (2) Divided into: two (2-ethylhexyl) phosphate esters with a volume fraction of 35%, sulfonated kerosene with a volume fraction of 45%, a...

Embodiment 2

[0048] A kind of preparation method of spherical iron powder, it is the following steps:

[0049] (1) Grinding the iron oxide scale until the material passes through a 200-mesh sieve, then adding a 6.5mol / L phosphoric acid solution, reacting at a temperature of 93°C for 4.5 hours, and then filtering to obtain the first filtrate and the first filter residue;

[0050] (2) adding the first filtrate to P204 extractant, through 6 stages of countercurrent extraction, 4 stages of countercurrent washing to obtain P204 iron soap, and obtain nickel-containing raffinate after extraction simultaneously;

[0051] (3) Put the P204 iron soap obtained in step (2) into the autoclave, feed hydrogen to maintain the pressure in the autoclave to be 8.5 atmospheres, react for 3.5 hours at a temperature of 160° C., and then cool to temperature after depressurization temperature below 35°C, then centrifuged, and the solids were washed to obtain iron powder;

[0052] (4) The iron powder obtained in t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention discloses a preparation method of spherical iron powder. Grind the iron oxide scale, then add phosphoric acid solution, react at a temperature of 80-95°C, and then filter to obtain the first filtrate and the first filter residue; add the first filtrate to the P204 extractant, extract and wash to obtain P204 iron Soap, nickel-containing raffinate is obtained after extraction at the same time; the obtained P204 iron soap is placed in a high-pressure reactor, fed with hydrogen to react at high temperature and high pressure, and then cooled to a temperature below 35°C after pressure relief, and then centrifuged. The solid is washed to obtain iron powder; after vacuum drying, airflow crushing, and then vacuum packaging after sieving to obtain spherical iron powder. The process of the invention is simple and short, realizes the separation of nickel chromium and iron, can realize the separation and recovery of all components, has a high recovery rate, and the final product has high purity, high added value of the product, and little impact on the environment. The cost is low, and the obtained iron powder is spherical iron powder with good dispersibility.

Description

technical field [0001] The invention relates to a method for preparing spherical iron powder, which belongs to the technical field of waste treatment. Background technique [0002] At present, stainless steel thick plates, thin plates, wire rods and pipes are widely used in various fields of the national economy. Stainless steel materials are subjected to repeated heat treatment during processing. Due to high temperature oxidation, a layer of dense spinel-like oxide scale (which is composed of NiFe 2 o 4 and NiCr 2 o 4 Wait). Scale on stainless steel hinders machining and must therefore be removed efficiently. [0003] The removed scale needs to be recycled because it contains metal elements such as iron, chromium, and nickel. The conventional treatment method is to return this material to the preparation of stainless steel, but there are the following problems: due to the different components of stainless steel of different grades, and the oxide scale is often mixed w...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & AuthorityPatents(China)
IPC IPC(8): C22B7/00C21B15/00C22B3/38C22B23/00C22B34/32B22F9/04
CPCB22F9/04B22F2009/044C21B15/00C22B7/007C22B23/0415C22B23/0453C22B34/32C22B3/3846Y02P10/20
Inventor王东升
Owner王东升