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A technology of ready-mixed concrete and tailings, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of land occupation, environmental pollution, etc., achieve small water consumption, reduce costs, and reduce management costs and running cost effects
Inactive Publication Date: 2010-06-23
ANGANG MINE CONSTR
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Tailings waste is currently stacked in tailings ponds, which not only
Method used
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Embodiment 1
[0021] A kind of C35 ready-mixed concrete, each raw material ratio is (unit Kg / m 3 ): p.s32.5 cement 330-350, grade III fly ash 90-120, river sand 530-630, gravel 950-1050, tailings powder 170-180, water 170-180, tailings modifier 9.2~9.8.
[0022] The method for producing C35 ready-mixed concrete, the steps of the method are:
[0023] 1) Naturally air-dry the waste tailings to lose moisture;
[0024] 2) Prepare various raw materials according to the above ratio, and the order of feeding when stirring is: river sand, tailings powder, cement, fly ash, first stir for 20 seconds, then add gravel and stir for 20 seconds, and finally add water and tailings Blend the ore modifier for 60 seconds and tap out the blender.
Embodiment 2
[0026] A kind of C30 concrete, each raw material ratio is (unit Kg / m 3 ): p.s32.5 cement 290-310, grade III fly ash 90-120, river sand 550-650, gravel 970-1070, tailings powder 180-300, water 170-180, tailings modifier 8.1-8.7.
[0027] The method of producing C30 concrete is the same as embodiment one.
Embodiment 3
[0029] A kind of C25 concrete, each raw material ratio is (unit Kg / m 3 ): p.s32.5 cement 240-260, grade III fly ash 90-120, river sand 570-670, gravel 1010-1110, tailings powder 180-300, water 170-180, tailings modifier 6.7-7.3.
[0030] The method of producing C25 concrete is the same as embodiment one.
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Abstract
The invention relates to premixed concrete and a production method thereof. The premixed concrete is prepared by the following raw materials in percentage by weight: 200-350 p.s32.5 cement, 90-120 fly ash, 530-740 river sand, 950-1110 rubble, 170-300 mine tailings powder, 170-190 water and 3.4-9.8 mine tailings modifier. The production method comprises the following steps: firstly, naturally air-drying waste tailings to lose water; preparing various raw materials according to the mixture ratio; the feeding sequence in mixing is: the river sand, the mine tailings powder, the cement and the fly ash; mixing for 20 seconds, then adding the rubble to be mixed for 20 seconds, finally adding the water and the mine tailings modifier to be mixed for 60 seconds; and slapping out from a mixer. The method makes full use of the abandoned mine tailings, saves the production cost, and can be widely used in concrete production.
Description
technical field [0001] The invention relates to a method for producing ready-mixed concrete by using waste fly ash and waste tailings. Background technique [0002] Metallurgical mining enterprises also produce a large amount of tailings waste while producing concentrate powder. For every ton of iron ore concentrate produced by an enterprise, about 2 tons of tailings waste will be generated. China produces a large amount of iron ore concentrate, lump ore, and fine ore throughout the year. If the output of local small-scale ore concentrators is included, the annual output is at least 200 million tons, and the cumulative tailings are about 400 million tons. Tailings waste is currently stacked in tailings ponds, which not only takes up a lot of land, but also causes serious environmental pollution. Therefore, how to turn waste into wealth and comprehensive utilization is imminent. In addition, the fly ash produced by the power plant also needs to be disposed of at any time. T...
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