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Premixed concrete produced by tailings

A technology of ready-mixed concrete and concrete, which is applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve problems such as environmental pollution of waste tailings, achieve extended service life, improve carbonation resistance, reduce Effects on management and operating costs

Inactive Publication Date: 2008-11-19
周志华 +1
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Problems solved by technology

[0003] The present invention overcomes the above-mentioned defects, and aims to solve the environmental pollution problem of waste tailings produced by metallurgical and mining enterprises, and provide a method for producing ready-mixed concrete using waste tailings from mine beneficiation

Method used

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  • Premixed concrete produced by tailings

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Embodiment Construction

[0020] The present invention utilizes the tailings to produce the ready-mixed concrete in this way, which will be described in detail below.

[0021] The present invention utilizes tailings to produce ready-mixed concrete, and utilizes waste tailings from mine dressing to produce tailings concrete with a strength level below C35. Waste tailings are used as a component of ready-mixed concrete, and its raw material composition is: PS32. 5 Cement, Class III fly ash, river sand, gravel, tailings powder, water and tailings modifier; of which:

[0022] (1) The slump of C35 tailings concrete out of the mixer is 25cm, and the formula is: PS32.5 cement 330~350kg, grade III fly ash 90~120kg, river sand 700~800kg, crushed stone 780~880kg, 180-300kg of tailings powder, 170-180kg of water and 9.2-9.8kg of tailings modifier;

[0023] (2) The slump of C30 tailings concrete out of the mixer is 25cm, and the formula is: PS32.5 cement 290~310kg, grade III fly ash 90~120kg, river sand 720~820kg...

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Abstract

The invention relates to premixed concrete made by tailings, and is characterized in that: tailings concrete with the strength grade under C35 is made by waste tailings of mine mineral processing; the waste tailings is used as one component of the premixed concrete, and comprises the raw materials of PS32.5 cement, III-grade fly ash, river sand, crushed stone, tailings powder, water and tailings modifier. A method for making the premixed concrete is as follows: waste tailings undergoes natural air drying to take leave of water; the feeding order during tailings concrete stirring is as follows: river sand, tailings powder, PS32.5 cement and III-grade fly ash; after 20-second stirring, crushed stone is added and stirred for 20 seconds; then, water and tailings modifier are added and stirred for 60 seconds and then are discharged out of a stirring machine. The premixed concrete is a high performance premixed concrete of low water-binder ratio and high compactness, and completely meets the GB / T14902-2003 standards of premixed concrete according to detection; moreover, the premixed concrete can be adapted to concrete placement of various types of structures.

Description

technical field [0001] The invention relates to a comprehensive utilization technology, in particular to a production of ready-mixed concrete using waste tailings from mine dressing. Background technique [0002] At present, domestic metallurgical and mining enterprises also produce a large amount of tailings waste while producing concentrate powder, and about 2 tons of tailings waste are produced for every ton of concentrate powder produced. According to incomplete statistics, the annual production of iron concentrate, lump ore, and fine ore in China is at least 200 million tons, and the tailings produced are about 400 million tons. Waste tailings are currently stacked in tailings ponds, which not only takes up a lot of land, but also causes serious environmental pollution. Contents of the invention [0003] The present invention overcomes the above-mentioned defects, and aims at solving the environmental pollution problem of waste tailings produced by metallurgical mini...

Claims

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Application Information

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IPC IPC(8): C04B28/04C04B18/12C04B18/08C04B14/06
CPCC04B18/12C04B2111/00068C04B28/04Y02W30/91C04B14/02C04B14/068C04B18/02C04B18/08C04B20/023C04B40/0028C04B40/0625C04B20/02
Inventor 武成兵周志华
Owner 周志华
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