Method for producing concrete active admixture by iron tailings

A technology of active admixture and iron tailings, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc. Grade concrete and other problems to achieve the effect of alleviating the shortage of ultra-fine slag powder, increasing the dosage, reducing energy consumption and environmental pollution

Active Publication Date: 2008-02-13
河北科晖环境资源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Invention patent CN1429784A "A Portland Cement Clinker" discloses a technology of mixing 5-18% iron tailings as ingredients for firing cement clinker. Significant technological advances in fuel sav

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] 90% of magnetite-quartzite-type iron tailings, 3% of lime, 4% of dihydrate gypsum, and 3% of altering agent are dry-mixed and ground to a fineness of 80 μm and sieved to 2.5%, and then the mixed and ground materials are The hydrothermal alteration reaction is carried out at 700°C in a cyclone suspension reactor, and the reaction time is 10 seconds. After cooling the above-mentioned reacted product, the obtained material is 80% by weight, and then mixed with 20% slag powder and ground to a fineness of 80 μm, and the remaining 0.3% of the sieve is obtained to obtain a concrete admixture that can replace slag superfine powder. . All performance indexes of the active admixture meet the performance indexes specified in S95 in GB / T18046-2000 "Granulated Blast Furnace Slag Powder Used in Cement and Concrete".

Embodiment 2

[0013] 80% of magnetite-quartzite-type iron tailings, 15% of lime, 3% of dihydrate gypsum, and 2% of alteration agent are dry-blended and ground to a fineness of 80 μm and sieved to 2.5%, and then the mixed-milled materials are The hydrothermal alteration reaction is carried out at 700°C in the cyclone suspension reactor, and the reaction time is 7 seconds. After cooling the above-mentioned reacted product, the obtained material is 40% by weight, and then mixed with 60% slag powder and ground to a fineness of 80 μm, and the remaining 0.3% of the sieve is obtained to obtain a concrete admixture that can replace slag superfine powder. . All performance indexes of the active admixture meet the performance indexes specified in S105 in GB / T18046-2000 "Granulated Blast Furnace Slag Powder Used in Cement and Concrete".

Embodiment 3

[0015] 85% of magnetite-quartzite-type iron tailings, 11.8% of calcium carbide slag, 3% of desulfurized gypsum, and 0.2% of altering agent are wet-mixed and ground to a fineness of 1% after the sieve residue of 80 μm, and then press-filtered and dehydrated. The materials are made into bricks and reacted in a tunnel kiln. The temperature of the firing zone in the kiln is controlled at 700°C±30°C, and the reaction time in the firing zone is 7 hours.

[0016] The material obtained after cooling the above-mentioned altered product is mixed with 10% slag at a weight percentage of 90% and ground until the sieve residue of 80 μm is 0.3%. The active concrete admixture that can be used instead of slag superfine powder is obtained. All performance indexes of the active admixture meet the performance indexes specified in S95 in GB / T18046-2000 "Granulated Blast Furnace Slag Powder Used in Cement and Concrete".

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Abstract

The present invention relates to a method to produce concrete active mixing material using the waste iron to replace part of scoria. The method is to add 70 percent to 93 percent of the magnet quartz waste iron, 1 percent to 20 percent of calcareousness or calcium carbide residual or the mixture of the two materials, 1-10 percent of gypsum or semi-water gypsum or anhydrite or decarbolizing gypsum or phosphorus gypsum or fluorspar gypsum or the mixture of the two or more than the two and 0.1 - 5 percent of corroding together to be milled into 80um griddle residual less or equal to 3 percent; and the grain is to be made the reaction of heat liquid corroding reaction. The corroding production after being cooled is mixed with 10 -60 percent of scoria with the molar percent between 40 percent and 90 percent and then to be milled into 80um griddle residual less or equal to 0.5 percent; in this way, the active concrete mixture replaced with the scoria powder is obtained. The present invention can make the magnet quartz waste iron treated with resource mode, relax the lacking of the super thin scoria powder led by the much larger infusion for the casting of the concrete and decrease the manufacturing cost for the concrete; the method can enhance the use amount of the mixture, decrease the use amount of the cement and decrease the resource consumption and environment pollution led by the cement production.

Description

Technical field: [0001] The invention belongs to the field of building materials, in particular to a method for producing active concrete admixtures from iron tailings. Background technique: [0002] Magnetite-quartzite iron ore is the most important type of iron ore in my country. This iron ore is mainly composed of two minerals, magnetite and quartz, and the content of the two minerals can reach more than 90%. With the improvement of beneficiation technology and the increasing demand for iron ore in the iron and steel industry, the grade of this type of ore continues to decline. Generally, 3 to 6 tons of iron ore are needed to select 1 ton of iron ore concentrate. That is, 5 to 10 tons of iron ore are needed to smelt 1 ton of pig iron. Therefore, the production of steel will produce a large amount of tailings. At present, the whole of China has accumulated tens of billions of tons of iron tailings, occupying a large amount of land, mountains and rivers, damaging the env...

Claims

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Application Information

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IPC IPC(8): C04B18/12C04B20/02
CPCC04B2111/00017C04B40/0046Y02W30/91C04B18/12C04B18/141C04B22/085C04B22/103C04B22/124C04B22/126C04B22/143C04B22/144C04B22/145C04B22/146C04B28/02
Inventor 倪文张玉燕郑永超刘凤梅张旭芳
Owner 河北科晖环境资源有限公司
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