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.
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[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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