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Method for manufacturing steam-pressing bricks by using iron tailings and steel slag

A technology for autoclaved bricks and iron tailings, which is applied in the field of autoclaved bricks and the use of iron tailings and steel slag to make autoclaved bricks, can solve problems such as poor stability, and achieve the effects of improving stability, reducing production costs and improving activity.

Active Publication Date: 2015-06-24
ZUNHUA ZHONGHUAN SOLID WASTE COMPREHENSIVE UTILIZATION CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problem of poor stability when the amount of steel slag is added in the process of preparing autoclaved bricks, the present invention provides an autoclaved brick prepared by using iron tailings and steel slag as main materials and modifying steel slag and the autoclaved brick preparation method

Method used

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  • Method for manufacturing steam-pressing bricks by using iron tailings and steel slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] 1. Steel slag modification

[0022] Add 0.7 parts of medium-temperature special digestion agent and appropriate amount of water (water-material ratio is 0.04) to 20 parts of steel slag powder, and the steel slag mixture is modified in an autoclave at 70°C for 20 hours.

[0023] 2. Autoclaved brick production

[0024] Proportion: 70 parts of iron tailings, 20 parts of modified steel slag, 18 parts of fly ash, 1.5 parts of desulfurized gypsum, 0.3 parts of activator, and the total water-material ratio of the mixture is 0.11.

[0025] Production process: The mixture is mixed and stirred, wheeled, and then pressed at 30MPa. After the bricks are left for 3 hours, they are autoclaved at 180°C for 6 hours to make autoclaved bricks. Autoclaved bricks meet the MU10 strength level of "Autoclaved Lime Sand Bricks" GB11945.

Embodiment 2

[0027] 1. Steel slag modification

[0028] Add 1.5 parts of medium-temperature special digestion agent and appropriate amount of water (water-to-material ratio: 0.05) to 30 parts of steel slag powder and stir evenly. The steel slag mixture is modified at 70°C for 18 hours.

[0029] 2. Autoclaved brick production

[0030] Proportion: 60 parts of iron tailings, 30 parts of modified steel slag, 13 parts of fly ash, 2.2 parts of phosphogypsum, 0.6 part of activator, and the total water-material ratio of the mixture is 0.10.

[0031] Production process: The mixture is mixed and stirred, wheeled, and then pressed at 25MPa. After the bricks are left for 4 hours, they are autoclaved at 180°C for 7 hours to make autoclaved bricks. Autoclaved bricks meet the MU10 strength level of "Autoclaved Lime Sand Bricks" GB11945.

Embodiment 3

[0033] 1. Steel slag modification

[0034] Add 2 parts of medium-temperature special digestion agent and appropriate amount of water (water-material ratio: 0.06) to 35 parts of steel slag powder and stir evenly. The steel slag mixture is modified at 90°C for 15 hours.

[0035] 2. Autoclaved brick production

[0036] Proportion: 50 parts of iron tailings, 35 parts of modified steel slag, 7 parts of slag powder, 2.6 parts of desulfurized gypsum, 1 part of activator, the total water-material ratio of the mixture is 0.08.

[0037] Production process: The mixture is mixed and stirred, wheeled, and then pressed at 27MPa. After the bricks are left for 4 hours, they are autoclaved at 180°C for 8 hours to make autoclaved bricks. Autoclaved bricks meet the MU10 strength level of "Autoclaved Lime Sand Bricks" GB11945.

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Abstract

The invention relates to a method for making autoclaved bricks by using iron tailings and steel slag, which uses the following raw materials in weight ratio: 50-70 parts of iron tailings, 20-35 parts of steel slag powder, 5-20 parts of active admixture, medium temperature 0.7-2 parts of special digestion agent, 1.5-3 parts of gypsum, 0.3-1 part of activator, 5.3-12.5 parts of water. The key technology is to physically and chemically modify and activate the steel slag to improve its stability and activity. In the autoclaved brick made by the invention, steel slag is the main cementitious material without cement, lime or calcium hydroxide, and the production cost is low.

Description

technical field [0001] The invention relates to an autoclaved brick and a method for making autoclaved bricks by using iron tailings and steel slag, in particular to an iron brick prepared by using modified steel slag powder, admixtures and additives as the main cementing material instead of cement or lime. Tailings autoclaved brick and preparation method thereof. Background technique [0002] my country is a big mining and steel country, with huge consumption of resources and huge discharge of tailings and steel slag. In 2012 alone, my country produced 717 million tons of crude steel and produced 100 million tons of steel slag. The total amount of tailings accumulated in the country has reached 8 billion tons. Restricted by various conditions such as geography, composition, and utilization technology, the utilization rates of these two bulk solid wastes are relatively low. Therefore, the accumulation of a large amount of iron tailings and steel slag will easily cause air...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/08
Inventor 刘振齐关中正赵风清张志国曹素改
Owner ZUNHUA ZHONGHUAN SOLID WASTE COMPREHENSIVE UTILIZATION CO LTD