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Method for preparing high-strength structure material by using iron tailings

A technology for structural materials and iron tailings, applied in sustainable waste treatment, solid waste management, climate sustainability, etc., can solve problems such as less than 5%, environmental and ecological damage, and reduce cement consumption and consumption. the effect of reducing environmental pollution

Inactive Publication Date: 2008-05-21
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In short, the overall utilization rate of iron tailings in the country is currently less than 5% on average. If a leap-forward new technology that can consume tailings in large quantities is not developed, there will be more and more tailings stockpiled in my country, which will have a negative impact on the environment and ecology. the damage will increase

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Step 1. Use a square hole sieve to screen out tailings with a particle size of 0.08-0.315 mm as fine aggregate.

[0018] Step 2. Use the mill to grind the remaining tailings and other raw materials in step 1 respectively. After grinding, the specific surface areas of various raw materials respectively reach: fine tailings 1047m 2 / kg, cement clinker 590m 2 / kg, slag 480m 2 / kg, gypsum 770m 2 / kg.

[0019] Step 3. Mix and grind 35% fine tailings, 29% cement clinker, 29% slag, and 7% gypsum until the specific surface area reaches 680m 2 / kg.

[0020] Step 4. Mix 50% by mass of coarse tailings as aggregate and 50% of the mixed cementitious material obtained in step 3, add UNF-5 naphthalene-based high-efficiency water reducer with 1% of the total mass of the resulting mixture and mix well Casting in the mold, vibration forming, demoulding after resting for 24 hours, steaming at a temperature of 40°C, and testing the compressive strength of steaming for 1 day, 3 days an...

Embodiment 2

[0024] Step 1. Use a square hole sieve to screen out tailings with a particle size of 0.08-0.315 mm as fine aggregate.

[0025] Step 2. Use the mill to grind the remaining tailings and other raw materials in step 1 respectively. After grinding, the specific surface area of ​​each raw material reaches: fine tailings 585m 2 / kg, cement clinker 660m 2 / kg, slag 580m 2 / kg, gypsum 730m 2 / kg.

[0026] Step 3. Mix and grind 42% fine tailings, 25.7% cement clinker, 26.3% slag, and 6% gypsum until the specific surface area reaches 750m 2 / kg.

[0027] Step 4. Mix 30% of tailings as fine aggregate and 70% of the mixed cementitious material obtained in step 3, and add Susper-320 polycarboxylate superplasticizer with a total mass of 1.4% of the resulting mixture , after mixing well, pour it into the mold, vibrate and form it, let it stand for 24 hours and then remove the mold, steam it at a temperature of 90°C for 24 hours, and then put it in a standard curing box at a temperature ...

Embodiment 3

[0031] Step 1. Use a square hole sieve to screen out coarse tailings with a particle size of 0.08-0.315 mm as fine aggregate.

[0032] Step 2. Use the mill to grind the remaining tailings and other raw materials in step 1 respectively. After grinding, the specific surface area of ​​each raw material reaches: fine tailings 859m 2 / kg, cement clinker 470m 2 / kg, slag 710m 2 / kg, gypsum 682m 2 / kg.

[0033] Step 3. Mix and grind 40% fine tailings, 26% cement clinker, 26% slag, and 8% gypsum until the specific surface area reaches 680m 2 / kg.

[0034] Step 4. Mix the coarse tailings as fine aggregate and 40% of the mixed cementitious material obtained in step 3 with a mass percentage of 60%, add UNF-5 naphthalene-based high-efficiency water reducer with a total mass of the mixture of 1.5%, and mix After evenly pouring in the mold, vibrating molding, demoulding after resting for 12 hours, steaming for 12 hours at a temperature of 40 ° C, and then autoclaving at a temperature o...

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Abstract

A method of using iron tailings to prepare materials with high strength structures belongs to the building material field and relates to a method of using the iron tailings as main raw materials to prepare cementing materials and using the iron tailings as fine aggregate to prepare materials with high strength structures of fine aggregate concrete. Solid wastes are used as aggregate and used to substitute a part of cement to produce materials with ecological structures. Through implementing certain mechanical grinding on the iron tailings and adding a certain amount of slag to substitute a part of cement clinker, ecological mixed cementing materials with perfect performances are prepared through a grinding-mixed grinding process. The ecological mixed cementing materials and the coarse grain iron tailings used as aggregate are mixed to prepare materials with high strength structures. Through the steam curing or the autoclaved condition, materials with high strength structures are obtained, the maximum compressive strength of which reaches to 100MPa above. The materials with high strength structures prepared through the method of the invention has the advantages of natural freestone resources saving performance, high waste utilization ratio, small environmental pollution, low production cost and simple process and can be prepared into various concrete prefabricated parts.

Description

Technical field: [0001] The invention belongs to the field of building materials, and relates to a method for preparing cementitious materials with iron tailings as the main raw material and a high-strength structural material for fine aggregate concrete with iron tailings as fine aggregates, using solid waste as aggregates and Substitute part of cement to produce ecological structural materials. Background technique: [0002] The iron and steel industry is one of the pillar industries of my country's national economy. In recent years, with the rapid development of my country's national economy, the steel industry has also developed rapidly. In 2005, my country's steel output reached 350 million tons. But at the same time, a series of social problems have been brought about by the massive discharge of iron tailings and the extremely low utilization rate. In 2005, my country's self-produced iron ore concentrate was 234 million tons. Based on this calculation, the total disc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/22
CPCC04B2103/302C04B28/16C04B2201/52C04B28/02Y02W30/91C04B7/02C04B18/12C04B18/141C04B20/0096C04B20/026C04B22/143C04B22/145C04B22/146C04B40/0028C04B40/0071C04B40/0082C04B40/024C04B18/14C04B24/223C04B24/226C04B24/2641
Inventor 倪文郑永超郭珍妮刘凤梅
Owner UNIV OF SCI & TECH BEIJING
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