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Mineral admixture and preparation method thereof

A technology of mineral admixtures and raw materials, applied in the field of building materials, can solve the problems of polluting the atmosphere, soil and water resources in surrounding areas, engineering quality problems, and volume stability deterioration, etc., to achieve large-scale and high added value. Effectiveness of utilization, reduction of energy consumption and carbon emissions

Active Publication Date: 2021-01-29
BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, due to various unfavorable factors (such as physical or chemical inhomogeneity, organic matter or heavy metals and other harmful substances) that exist in bulk industrial solid waste, it brings many problems to the direct use of industrial solid waste.
In particular, the reduced hydration activity and poor volume stability of Portland cement clinker can lead to serious engineering quality problems
Long-term stacking of bulk industrial solid waste will also encounter difficulties, and the leaching process of organic matter or heavy metals may pollute the atmosphere, soil and water resources in surrounding areas
Therefore, the disposal of bulk industrial solid waste has posed a major challenge to the living environment. At present, there is no large-scale and clean solution. It is of great significance to develop technologies for the recycling and utilization of bulk solid waste as efficiently and sustainably as possible.

Method used

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  • Mineral admixture and preparation method thereof
  • Mineral admixture and preparation method thereof
  • Mineral admixture and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0055] Use low-grade limestone, desulfurization gypsum, molybdenum tailings and chemical solid waste mineralizer containing calcium fluoride to mix according to the ratio of 58%: 19.0%: 22.0%: 1.0%, and use a ball mill to grind until the mixture is larger than 90 microns The particles are less than 1%; then, add a small amount of water to the mixture, stir it evenly, and press it into a test cake with a thickness of about 2cm and a diameter of 5cm; then, put the test cake into a high-temperature electric furnace for calcination, and the heating rate of the electric furnace is 15 °C / min, calcined at 1180 °C for 30 min, and then rapidly cooled to room temperature to obtain the product. Wherein, SiO in the molybdenum tailings 2 、Al 2 o 3 、Na 2 O, K 2 O and Fe 2 o 3 The contents of calcium oxide in the low-grade limestone are 65.93%, 13.31%, 2.51%, 2.47%, and 3.58%, respectively; the content of calcium oxide in the low-grade limestone is 46.3%; 2 The content is 17.2%.

[0...

Embodiment 2

[0060] Use papermaking white mud, desulfurization gypsum, gold tailings and manganese oxide-containing manganese slag industrial solid waste mineralizer to mix according to the ratio of 65%: 15.0%: 18.0%: 2.0%, and use a ball mill to grind until the mixture is greater than 90% The micron particles are less than 1%; then, add a small amount of water to the mixture, stir evenly, and use a press to press into a test cake with a thickness of about 2cm and a diameter of 5cm; then, put the test cake into a high-temperature electric furnace for calcination, and the heating rate of the electric furnace is 15°C / min, calcined at 1230°C for 20min, and then rapidly cooled to room temperature to obtain the product. Wherein, the SiO in the gold tailings 2 、Al 2 o 3 、Na 2 O, K 2 O and Fe 2 o 3 The content of calcium oxide in the paper-making lime mud is 64.6%, 10.8%, 1.98%, 3.01%, and 7.6%, respectively; the content of calcium oxide in the white mud for papermaking is 51.0%; The manga...

Embodiment 3

[0064] Use calcium carbide slag, phosphogypsum, coal gangue and copper oxidized copper slag industrial solid waste mineralizer to mix according to the ratio of 48%: 21.0%: 30.0%: 1.0%, and use a ball mill to grind until the mixture is larger than 90 microns The particles are less than 1%; then, add a small amount of water to the mixture, stir it evenly, and press it into a test cake with a thickness of about 2cm and a diameter of 5cm; then, put the test cake into a high-temperature electric furnace for calcination, and the heating rate of the electric furnace is 15 °C / min, calcined at 1150 °C for 30 min, and then rapidly cooled to room temperature to obtain the product. Wherein, SiO in the gangue 2 、Al 2 o 3 、Na 2 O, K 2 O and Fe 2 o 3 The content of calcium oxide in the calcium carbide slag is 58.97%, 23.55%, 0.48%, 1.32%, 2.71% respectively; the calcium oxide content in the calcium carbide slag is 68.1%; the copper slag industrial solid waste mineralizer containing cop...

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Abstract

The invention belongs to the technical field of building materials, and particularly relates to a mineral admixture and a preparation method thereof. The proportion of a crystalline phase in the mineral admixture is 60% by mass or more. Based on the total mass of the crystalline phase, the crystalline phase comprises 0-10% of dicalcium silicate crystals, 0-3% of calcium oxide crystals, 50-85% of iron oxide doped calcium sulphosilicate crystals, 0-12% of calcium sulphoaluminate crystals and 0-15% of tetracalcium aluminoferrite crystals. The mineral admixture disclosed by the invention has highhydration activity, and after the mineral admixture is used for replacing 30% of reference cement, according to a GBT 1596-2005 test, the 3d activity index is greater than 115%, the 7d activity indexis greater than 135%, and the 28d activity index is greater than 130%. Meanwhile, industrial solid waste can be used as a raw material for preparation, and waste is turned into wealth.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a mineral admixture and a preparation method thereof. Background technique [0002] The production of one ton of cement clinker releases approximately 0.9 tons of carbon dioxide (CO 2 ). In recent years, with the increasing demand for cement worldwide and the raw material resources, energy resources and CO 2 The production cost of air-entrained emission certificates keeps rising, and cement companies reduce the clinker rate by adding limestone powder, fly ash, granulated slag, etc. as clinker substitute materials. The development of bulk industrial solid waste as an alternative to cementitious materials has increasingly become the focus of attention. [0003] A large amount of industrial solid waste is generated in industrial fields such as thermal treatment of solid waste, coal power generation, renewable energy, metallurgy, and mineral processing. Acc...

Claims

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Application Information

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IPC IPC(8): C04B7/345C04B7/24C04B7/26C04B7/28C04B7/36C04B7/44C04B7/52
CPCC04B7/345C04B7/24C04B7/26C04B7/28C04B7/36C04B7/44C04B7/52Y02P40/10
Inventor 王肇嘉刘艳军徐瑞来李沙李润丰
Owner BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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