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A kind of preparation method and application of modified bentonite

A technology of bentonite and calcium-based bentonite, applied in chemical instruments and methods, inorganic chemistry, non-metallic elements, etc., can solve the problems of serious mechanical loss, long time period, long operation, etc., to improve the quality of green pellets, low cost, Simple to use effects

Active Publication Date: 2016-01-20
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the existing technology that if the iron grade of the pellets is to be improved while satisfying the strength of the green pellets, for the calcium-based bentonite, the traditional modification method needs to be sodium-modified first, and then modified. The sodium-based bentonite is organically synthesized, and the existence time is long, the mechanical loss is serious, the operation is lengthy, and the cost is high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] When modifying natural calcium-based bentonite, first dissolve 200g of commercially available sodium humate with 1.2L of 0.1mol / L NaOH, then add 200g of calcium-based bentonite to it, heat and stir in a water bath at 80°C for 60min, then filter the mixture . The resulting filter cake was dried at 80°C. Then the dried filter cake is crushed and ground to -200 mesh accounting for more than 98% to obtain the modified bentonite.

[0035] When the modified bentonite is used for pelletizing, 1 wt% of the modified bentonite is added to the magnetite concentrate with a particle size of -200 mesh and 85%, and the pelletizing is performed after mixing. The drop strength of the obtained green balls was 5.2 times / 0.5m, and the bursting temperature of the green balls was 595°C. The preheating ball strength is 431N / piece, and the roasting ball strength is 2519N / piece. The finished ductile iron grade is 62.96%.

Embodiment 2

[0037] When modifying natural calcium-based bentonite, first dissolve 200g of commercially available sodium humate with 1.2L of 0.1mol / L NaOH, then add 100g of calcium-based bentonite to it, heat and stir in a water bath at 75°C for 50min, and then dissolve the mixture filter. The resulting filter cake was dried at 75°C. Then the dried filter cake is crushed and ground to -200 mesh accounting for more than 98% to obtain the modified bentonite.

[0038] When the modified bentonite is used for pelletizing, 0.75wt% of the modified bentonite is added to the hematite concentrate with a particle size of -200 mesh and 80-90%, and the pelletizing is performed after mixing. The drop strength of the obtained green balls was 7.2 times / 0.5m, and the bursting temperature of the green balls was 581°C. The preheating ball strength is 437N / piece, and the roasting ball strength is 2519N / piece. The grade of finished ductile iron is 62.73%.

Embodiment 3

[0040] When modifying natural calcium-based bentonite, first dissolve 300g of commercially available sodium humate with 1.2L of 0.1mol / L NaOH, then add 100g of calcium-based bentonite to it, heat and stir in a water bath at 65°C for 45min, and then dissolve the mixture filter. The resulting filter cake was dried at 65°C. Then the dried filter cake is crushed and ground to -200 mesh accounting for more than 98% to obtain the modified bentonite.

[0041] When the modified bentonite is used for pelletizing, 0.5wt% modified bentonite is added to the magnetic and red mixed iron concentrate with a particle size of -200 mesh and 80% to 90%, and the pelletizing is performed after mixing. The drop strength of the obtained green balls was 10.5 times / 0.5m, and the bursting temperature of the green balls was 588°C. The preheating ball strength is 436N / piece, and the roasting ball strength is 2522N / piece. The grade of finished ductile iron is 62.98%.

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Abstract

The invention discloses a preparation method and application of modified bentonite. The preparation method of the modified bentonite comprises the following steps: grinding and crushing natural calcium-based bentonite; then, adding the ground and crushed natural calcium-based bentonite into a sodium hydroxide solution containing sodium humate and carrying out heating reaction; filtering and separating to obtain a filter cake after the reaction is completed; and drying, grinding and crushing the obtained filter cake to obtain modified bentonite. The preparation method is short in flow, simple to operate and low in cost; the prepared modified bentonite which is used as a binder in a pelletizing process of an iron ore pelletizing process is added into iron ore concentrate, so that the quality of green balls and the all-iron grade of the finished product balls can be effectively improved.

Description

technical field [0001] The invention relates to a preparation method and application of modified bentonite, in particular to a preparation method and application of sodium humate modified bentonite, and belongs to the field of metallurgical engineering materials. Background technique [0002] The main mineral component of bentonite is montmorillonite. The crystal structure of montmorillonite belongs to the monoclinic system, which is a 2:1 type layered silicate composed of two layers of silicon-oxygen tetrahedral sheets sandwiching a layer of aluminum (magnesium) oxygen octahedral sheets. The silicon-oxygen tetrahedral sheet is a nearly hexagonal network-shaped silicon-oxygen sheet located on the same plane formed by the connection of the silicon-oxygen tetrahedrons with shared corners. The aluminum-oxygen octahedron is composed of two opposing silicon-oxygen tetrahedral sheets providing 4 oxygen atoms and two oxygen atoms provided by hydroxyl groups in the same plane. Mag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/40C22B1/243
Inventor 张元波姜涛李光辉周友连孙阳范晓慧黄柱成郭宇峰杨永斌李骞陈许玲彭志伟甘敏刘兵兵游志雄苏子键刘臣陈军
Owner CENT SOUTH UNIV
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