Method for preparing pyritic slag pellet raw material and method for preparing green pellets

A technology for pelletizing sulfuric acid slag and pelletizing ore, which is applied in the field of pelletizing and can solve the problems of poor spheroidization, low green pellet strength, and low water content of sulfuric acid slag.

Active Publication Date: 2011-08-17
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present inventors have found that when considering using sulfuric acid slag as pellet raw material, there is the following problem: the water content of sulfuric acid slag is relatively low, generally below 1 wt%, so when making pellets, more water needs to be mixed to carry out the batching However, due to the hydrophobicity of the surface of sulfuric acid slag and poor ball formation, the strength of green pellets made directly by adding water to sulfuric acid slag is low, which cannot meet the process needs of grate-rotary kiln

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0022] A kind of preparation method for preparing pellet raw material provided by the invention comprises steps:

[0023] a) taking the sulfuric acid slag and mixing it with water for the first time to obtain a mixture, the water content of the mixture is 1wt-13wt%;

[0024] b) carrying out trapped material processing to the mixture;

[0025] c) Secondary mixing the mixture after the trapped material treatment with water and other iron-containing raw materials to obtain pellet raw materials.

[0026] The sulfuric acid slag mentioned herein refers to the waste slag produced after sulfuric acid production from pyrite well known to those skilled in the art. The main component of sulfuric acid slag is Fe 2 o 3 , with a high iron grade, when used to make pellets, it can not only alleviate the increasingly tight iron ore resources, but also solve the waste utilization of sulfuric acid slag, which is conducive to environmental protection.

[0027] According to the present inventi...

Embodiment 1

[0043] 1) Take the sulfuric acid slag and mix it with water for the first time to obtain a mixture, the water content in the mixture is 10wt%;

[0044] 2) processing the mixture for 16 hours;

[0045] 3) mixing the sulfuric acid slag after the trapped material treatment with magnetite and water for the second time to obtain a pellet raw material, the sulfuric acid slag content in the pellet raw material is 40wt%, the water content is 11wt%, and the rest is hematite;

[0046] 4) Take 100 parts by weight of the pellet raw material, grind to obtain 75wt% pellet powder with a particle size of less than 45 μm, and then mix it with 2 parts by weight of bentonite, and make it in a granulator For green pellets with a particle size of 9 mm to 16 mm, the performance test is as follows: the drop strength of the green pellets is 3.7 times.

Embodiment 2

[0048] 1) Take the sulfuric acid slag and mix it with water for the first time to obtain a mixture, the water content in the mixture is 12wt%;

[0049] 2) processing the mixture for 16 hours;

[0050] 3) mixing the sulfuric acid slag after the trapped material treatment with magnetite and water for the second time to obtain a pellet raw material, the sulfuric acid slag content in the pellet raw material is 40wt%, the water content is 12wt%, and the rest is magnetite;

[0051] 4) Take 100 parts by weight of the pellet raw material, grind to obtain 75wt% pellet powder with a particle size of less than 45 μm, and then mix it with 2 parts by weight of bentonite, and make it in a granulator For green pellets with a particle size of 9 mm to 16 mm, the performance test is as follows: the drop strength of the green pellets is 3.9 times.

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Abstract

The invention provides a method for preparing a pyritic slag pellet raw material, which comprises the following steps: a) performing primary mixing on pyritic slag and water to prepare a mixture of which the water content is between 1 and 13 weight percent; b) performing ageing treatment on the mixture; and c) performing secondary mixing on the aged mixture, water and other iron-containing raw materials to prepare the pellet raw material. When the mixture is subjected to the ageing treatment, the water content in the mixture can fully moisten the pyritic slag, so that the capillary action of micropores of the pyritic slag can be better exerted to improve the ballability of the mixture. When green pellets are prepared from the pellet raw material comprising the mixture, the green pellets meeting technological requirements are prepared under the action of a binder and pores of the pellet raw material.

Description

technical field [0001] The invention relates to pellets, in particular to a method for preparing raw materials for sulfuric acid slag pellets and a method for preparing green pellets by utilizing the raw materials for pellets. Background technique [0002] Pellet is one of the main raw materials for blast furnace ironmaking and direct reduced iron. Pellets have several advantages over sinter. For example, pellets are of high grade and have higher mechanical strength than sintered ore in cold state, so they are not easy to be broken and cracked during transportation, loading and unloading and storage, with less consumption and less powder produced, which is conducive to improving the air permeability of blast furnace material column , so that the airflow in the furnace is evenly distributed. There are three main methods for preparing pellets, namely: shaft furnace pelletizing method, belt roaster pelletizing method, and grate-rotary kiln pelletizing pelletizing method. Com...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/248
CPCY02P10/20
Inventor 夏耀臻唐和群董发科黎前程
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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