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Method for preparing iron carbide from multi-metal sulfur acid residue

A sulfuric acid slag and multi-metal technology, applied in the field of metallurgy, can solve the problems of easy spontaneous combustion of reduced iron powder, low added value of iron concentrate, inability to remove copper, lead and non-ferrous metals, etc., and achieve the effect of less investment and short process

Active Publication Date: 2017-08-22
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The existing technology mainly has the following disadvantages: the traditional gravity separation, flotation and magnetic separation process cannot remove non-ferrous metals such as copper, lead, zinc, etc., the added value of the prepared iron concentrate is low, and it needs to go through a multi-step high-temperature process blast furnace charge
Reduced iron powder is also prone to spontaneous combustion during storage and transportation due to its high activity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Example 1: The iron grade of the sulfuric acid slag is 59.20%, the contents of copper, lead and zinc are respectively 0.89%, 1.11% and 0.29%, and the content of the sulfuric acid slag smaller than 0.075mm is 78.58%. Added 8% CaCl 2 The sulfuric acid slag with 1.8% bentonite is rubbed in a moistening mill for 4 minutes, and the moistening water is 15%. After moistening, it is prepared into green balls with a diameter of 8-16mm in a disc pelletizer. The drop strength of green balls is 3.9 times / 0.5m, and the green balls are chlorinated at 1100 for 25 minutes after drying. The resulting chlorinated pellets were cooled at 650 °C and CO:CO 2 :H 2 Carburize for 180 minutes in a mixed gas of 65:15:20, and cool the hot ball in nitrogen. After cooling the pellets were broken down to less than 1mm. Under the condition that the pulp concentration is 50%, ball milling in a conical ball mill to obtain a ball milling fineness of 99% is less than 200 mesh, and then the pulp is mag...

Embodiment 2

[0045] Example 2: The iron grade of the sulfuric acid slag is 56.20%, the contents of copper, lead and zinc are respectively 0.39%, 0.89% and 0.59%, and the content of the sulfuric acid slag smaller than 0.075mm is 86.58%. The sulfuric acid slag added with 8% NaCl and 1.5% bentonite was milled in a moistening mill for 3 minutes with a water content of 15%. After moistening, it was prepared into green balls with a diameter of 8-16mm in a disc pelletizer. The drop strength of green balls is 3.2 times / 0.5m, and the green balls are chlorinated at 1100 for 30 minutes after drying. The resulting chlorinated pellets were cooled at 650 °C and CO:CO 2 :H 2 Carburize for 160 minutes in a mixed gas of 70:10:20, and cool the hot ball in nitrogen. After cooling the pellets were broken down to less than 1mm. Under the condition that the pulp concentration is 50%, ball milling in a conical ball mill to obtain a ball milling fineness of 100% less than 200 mesh, and then the pulp is magneti...

Embodiment 3

[0046] Example 3: The iron grade of the sulfuric acid slag is 49.70%, the contents of copper, lead and zinc are respectively 0.28%, 1.35% and 0.69%, and the content of the sulfuric acid slag smaller than 0.075mm is 80.12%. Added 8% CaCl 2 The sulfuric acid slag with 2.1% bentonite is rubbed in a moistening mill for 3 minutes, and the moistening water is 13%. After moistening, it is prepared into green balls with a diameter of 8-16mm in a disc pelletizer. The drop strength of green balls is 3.5 times / 0.5m, and the green balls are chlorinated at 1100 for 30 minutes after drying. The obtained chlorinated pellets were at 750 °C and CH 4 :H 2 Carburize in a 40:60 mixed gas for 80 minutes, and cool the hot ball in nitrogen. After cooling the pellets were broken down to less than 1mm. Under the condition of pulp concentration of 50%, ball milling in a conical ball mill to obtain a ball milling fineness of 100% less than 200 mesh, and then magnetic separation of the pulp in a magn...

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Abstract

The invention discloses a method for preparing iron carbide from multi-metal sulfur acid residues. The method comprises the following steps that the multi-metal sulfur acid residues, a bonding agent and a chloridizing agent are uniformly mixed and are prepared into a pelletizing material; the pelletizing material are made into green balls; after drying, heating chlorination is performed; carburization is performed in CO+CO2+H2 or CH4+H2 gas, and cooling is performed in inert atmosphere; a ball group subjected to carburization is obtained; the ball group subjected to the carburization is subjected to wet ball milling; after ball milling, wet magnetic separation and drying are performed to obtain the iron carbide. The method provided by the invention has the advantages that the iron carbide preparation is efficient, fast and convient; the cost is low; the energy is saved and the environment is protected.

Description

technical field [0001] The invention relates to the field of metallurgy, in particular to a method for preparing iron carbide by utilizing polymetallic sulfuric acid slag. Background technique [0002] As an important secondary resource, sulfuric acid slag not only contains rich iron, but also contains a small amount of non-ferrous metals such as copper, lead, and zinc. The iron grade of sulfuric acid slag is generally 30% to 63%, which is significantly higher than the average iron ore grade of 33% in my country. The non-ferrous metals such as copper, lead, and zinc contained in it also have considerable recovery value. According to statistics, my country discharges about 15 million tons of sulfuric acid slag every year, and the accumulated sulfuric acid slag is as high as hundreds of millions of tons. This part of sulfuric acid slag not only pollutes the environment and occupies cultivated land, but also brings harm to the human body due to the non-ferrous metals it contain...

Claims

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Application Information

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IPC IPC(8): C01B32/914
Inventor 陈栋国宏伟闫炳基李鹏李洪玮万康霍海疆许泽敏
Owner SUZHOU UNIV
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