Bentonite used for pellets, and preparation method thereof

A technology of bentonite and sodium-based bentonite, which is applied in the field of bentonite for pellets and its preparation, can solve the problems affecting the energy consumption and output of blast furnace ironmaking, high green pellet pulverization rate, and slow drying speed, etc., and achieve shortening of roasting time, Good roasting performance and high pelletizing effect

Inactive Publication Date: 2012-12-12
绵阳堃山矿业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main components of bentonite are sio2 and AL203. For every 1% of bentonite added, the iron grade of pellets will decrease by 0.6%. There are phenomena such as high pulverization rate of green pellets, slow drying speed, low strength, high return rate, and lower grade, which seriously affect the energy consumption and output of blast furnace ironmaking
[0003] Moreover, the iron and steel industry generally uses bentonite as a pellet binder. The unit consumption of natural calcium-based bentonite is more than 35kg / ton of balls, which is relatively high; while the unit consumption of sodium-based bentonite is reduced, but it is easy to popping problem

Method used

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  • Bentonite used for pellets, and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Example 1 Preparation of bentonite for pellets

[0028] (1) Pulverize the bentonite;

[0029] (2) Add 3 parts by weight of industrial alkali to 90 parts by weight of the pulverized bentonite;

[0030] (3) Mix the two materials evenly;

[0031] (4) Extrude the mixture into blocks;

[0032] (5) Stack the extruded blocks for 15-20 days to complete sodiumization;

[0033] (6) Naturally dry the sodiumized blocks for 5-15 days;

[0034] (7) Dry the blocks that have been naturally dried with hot air, so that the moisture content reaches below 12% by weight;

[0035] (8) Add 1 part by weight of cellulose ether or sodium cellulose, and stir evenly;

[0036] (9) After being ground into 1200-1500 mesh particles, it is ready.

[0037]

Embodiment 2

[0038] Example 2 Preparation of bentonite for pellets

[0039] The method for preparing described bentonite for pellets comprises the following steps:

[0040] (1) Pulverize the bentonite;

[0041] (2) Add 4 parts by weight of industrial alkali to the pulverized bentonite of 95 parts by weight;

[0042] (3) Mix the two materials evenly;

[0043] (4) Extrude the mixture into blocks;

[0044] (5) Stack the extruded blocks for 15-20 days to complete sodiumization;

[0045] (6) Naturally dry the sodiumized blocks for 5-15 days;

[0046] (7) Dry the blocks that have been naturally dried with hot air, so that the moisture content reaches below 12% by weight;

[0047] (8) Add 2 parts by weight of cellulose ether or sodium cellulose, and stir evenly;

[0048] (9) After being ground into 1200-1500 mesh particles, it is ready.

[0049]

Embodiment 3

[0050] Example 3 Preparation of bentonite for pellets

[0051] The method for preparing described bentonite for pellets comprises the following steps:

[0052] (1) Pulverize the bentonite;

[0053] (2) Add 5 parts by weight of industrial alkali to 100 parts by weight of the pulverized bentonite;

[0054] (3) Mix the two materials evenly;

[0055] (4) Extrude the mixture into blocks;

[0056] (5) Stack the extruded blocks for 15-20 days to complete sodiumization;

[0057] (6) Naturally dry the sodiumized blocks for 5-15 days;

[0058] (7) Dry the blocks that have been naturally dried with hot air, so that the moisture content reaches below 12% by weight;

[0059] (8) Add 3 parts by weight of cellulose ether or sodium cellulose, and stir evenly;

[0060] (9) After being ground into 1200-1500 mesh particles, it is ready.

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Abstract

The invention discloses bentonite used for pellets, and a preparation method thereof. The bentonite is composed of the components of, by weight: 90-100 parts of bentonite, 3-5 parts of industrial alkali, and 1-3 parts of cellulose ethers or cellulose sodium. When the pellet-use bentonite provided by the invention is used for coating obtained iron ore pellets, pellet bursting is reduced. The iron ore pellets can be prevented from bursting under more than 3000 Newton and 10 times of drops. Silicon content of the pellets is greatly reduced. As a result of furnace casting experiments, when the pellets are added at a temperature of 1200 DEG C, the pellets do not burst. Also, an iron tapping speed is substantially improved. Compared with a traditional method that only bentonite is used as an additive, the pellet-use bentonite provided by the invention is advantaged in high adhesive force, high pellet degree, reduced roasting time, good roasting performance, improved pellet ore grade, and reduced energy consumption.

Description

technical field [0001] The invention relates to a bentonite, in particular to a bentonite for pellets and a preparation method thereof. Background technique [0002] Sintered pellet binder is a key auxiliary raw material for the production of pellets in the iron and steel industry, and its performance is directly related to the quality of the pellets. For a long time, domestic and foreign sintering plants have used bentonite as a binder to make pellets. Bentonite is a commonly used binder in traditional pellet additives. Bentonite can improve the drop strength and compressive strength of green pellets. In addition, It can also increase the bursting temperature of green balls during drying. The main components of bentonite are sio2 and AL203. For every 1% of bentonite added, the iron grade of pellets will decrease by 0.6%. There are phenomena such as high pulverization rate of green balls, slow drying speed, low strength, high return rate, and lower grade, which seriously a...

Claims

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Application Information

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IPC IPC(8): C22B1/243
Inventor 江浩
Owner 绵阳堃山矿业有限公司
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