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Fine grain tailing low-cost solidification disposal method

A fine-grained tailings and disposal method technology, which is applied in the field of mines and environmental engineering, can solve the problems of low comprehensive utilization of tailings, high preparation cost, and large amount of gelling agent, and achieve low tailings solidification cost and synergistic catalysis The effect of strong capacity and good environmental benefits

Inactive Publication Date: 2013-02-13
武钢资源集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] The traditional tailings disposal method has many problems such as economy, safety, environmental protection, land consumption, etc. The development of tailings disposal technology without storage is the main issue in mining production
At present, the tailings underground filling technology is in the promotion stage, but the technology uses a large amount of gelling agent, the pipeline is easy to wear, corrode and scale, and there are problems such as high cost and difficult operation and management
For example, the Chinese invention patent No. 200610012672.X "Mine Tailings Autoclaved Bricks and Its Manufacturing Method" is aimed at making building bricks. The curing agent is made of metallurgical slag or fly ash, cement clinker, phosphogypsum or desulfurized gypsum , anhydrite, sodium sulfate, sodium silicate, and sodium carbonate, the composition is diverse and complex, the preparation cost is high, and it is difficult to be directly used in large-scale tailings disposal practice
The Chinese invention patent application with the patent application number 201010241928.0 "A dry storage method for mineral processing tailings solidification treatment without tailings pond" adopts the process of "adding curing agent-aging-rolling" for dry storage of tailings , this technology has special requirements for the site, the comprehensive utilization of tailings is very low, and its curing agent contains cement clinker, gypsum and other industrial products, and the treatment cost is also high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] The content of iron tailings with fineness <74μm is 81%, and it is concentrated to a moisture content of 65%. The ratio of fly ash / quicklime / sintered desulfurization ash is 1 / 0.47 / 0.14, mixed and ground until the content of <50μm is greater than 99%, and the powdery curing agent is prepared. 120 parts by weight of tailings slurry and 9.6 parts by weight of curing agent were mixed in a mechanical mixer, and 6.4 parts by weight of dry tailings of the same fineness were added simultaneously during the mixing process (equivalent to solid tailings / curing agent mass ratio of 90.4 / 9.6, the moisture content is 26.5%). After the mixture was aged for 24 hours in a ventilated environment at 30°C, the water content of the material was 16.3%; after that, it was pressed and formed under a molding pressure of 20MPa; after 36 hours of natural curing, it was placed in an autoclave for curing, and the curing temperature was 180°C , the curing time is 2 hours, and a solidified block is ...

Embodiment 2

[0020] The content of iron tailings with fineness <74μm is 81%, and it is concentrated to a moisture content of 68%. The ratio of fly ash / quicklime / sintered desulfurization ash is 1 / 0.47 / 0.14, mixed and ground until the content of <50μm is greater than 99%, and the powdery curing agent is prepared. 125 parts by weight of tailings slurry and 12.7 parts by weight of curing agent are mixed in a mechanical mixer, and 2.3 parts by weight of dry tailings of the same fineness are added simultaneously during the mixing process (equivalent to solid tailings / curing agent mass ratio of 87.3 / 12.7, the moisture content is 28.6%). After the mixture was aged for 60 hours in a ventilated environment at 20°C, the water content of the output was 16.5%; then it was pressed and formed under a molding pressure of 20MPa; The time is 8h, and the solidified block is obtained. After 7 days, the average compressive strength of the cured block was 7.50MPa, and the average compressive strength when it...

Embodiment 3

[0022] The content of iron tailings with fineness <74μm is 81%, and it is concentrated to a moisture content of 65%. The ratio of fly ash / quicklime / sintered desulfurization ash is 1 / 0.47 / 0.14, mixed and ground until the content of <50μm is greater than 99%, and the powdery curing agent is prepared. 110 parts by weight of tailings slurry and 23.8 parts by weight of curing agent are mixed in a mechanical mixer, and 4.7 parts by weight of dry tailings of the same fineness are added during the mixing process (equivalent to solid tailings / curing agent mass ratio of 76.2 / 23.8, the moisture content is 27.8%). After the mixture was aged for 24 hours in a ventilated environment at 30°C, the water content of the material was 16.6%; then it was pressed and formed under a molding pressure of 20MPa; after natural curing for 36 hours, it was placed in an autoclave for curing, and the curing temperature was 180°C , and the curing time is 8 hours; after being discharged from the kettle, bui...

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Abstract

The invention discloses a fine grain tailing low-cost solidification disposal method which comprises five processes: tailing concentration and transportation, curing agent mixing grinding, mixing of tailing and curing agent, aging and molding, and conserving. Curing agent is composed of pulverized fuel ash, quick lime and sintering desulfurization ash. The weight ratio of the pulverized fuel ash, the quick lime and the sintering desulfurization ash is 1:0.4-0.5:0.12-0.15. Tailing is mixed with the curing agent, and dry tailings are added so that in the final discharged materials, water is presented in amount of 24%-29%. By dry weight, the ratio between the tailing and the curing agent is 76.2-90.4:9.6-23.8. The conserving process comprises natural conserving, or combination of the natural conserving and atmospheric steam or high-pressure steam. The curing agent is simple in formula, little in use dosage, good in catalytic effect, high in strength of curing products, and low in tailing curing cost. Through adjustment of dosage of the curing agent, curing products of various construction materials like construction bricks for filling or producing can be produced, and combination of tailing processing and tailing comprehensive utilization are achieved.

Description

technical field [0001] The invention belongs to the technical field of mining and environmental engineering, and in particular relates to a low-cost solidification disposal method for fine-grained tailings. Background technique [0002] The traditional tailings disposal method has many problems such as economy, safety, environmental protection, land consumption, etc. The development of tailings disposal technology without storage is the main issue in mining production. At present, the tailings underground filling technology is in the promotion stage, but this technology uses a large amount of gelling agent, the pipeline is easy to wear, corrode and scale, and there are problems such as high cost and difficult operation and management. For example, the Chinese invention patent No. 200610012672.X "Mine Tailings Autoclaved Bricks and Its Manufacturing Method" is aimed at making building bricks. The curing agent is made of metallurgical slag or fly ash, cement clinker, phosphogy...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/00C04B18/12
CPCY02W30/91
Inventor 罗文斌李铁一刘正强雷国元
Owner 武钢资源集团有限公司
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