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Solid-waste-based cementing material for treating pyrite slag and use method of solid-waste-based cementing material

A technology of pyrite slag and a treatment method, which is applied in the field of environmental restoration, can solve problems such as polluting the environment of a mining area, and achieve the effects of reducing the amount of engineering, safe treatment, and solving the risk of an anti-seepage structure.

Active Publication Date: 2022-06-17
CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the problem of acid mine wastewater under the action of oxygen and water, which will continue to pollute the mining area when pyrite slag is landfilled or stored in the open air environmental problems

Method used

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  • Solid-waste-based cementing material for treating pyrite slag and use method of solid-waste-based cementing material
  • Solid-waste-based cementing material for treating pyrite slag and use method of solid-waste-based cementing material
  • Solid-waste-based cementing material for treating pyrite slag and use method of solid-waste-based cementing material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The pyrite slag samples were divided into experimental group, control group 1 and control group 2. Among them,

[0043] Experimental group: solid waste-based cementitious materials were prepared, including 35% slag, 28% desulfurization gypsum, 16% steel slag, 10% red mud, 7% manganese sand and 4% zeolite. Among them, the slag quality coefficient K=1.4, the desulfurization gypsum contains 95% CaSO 4 , The steel slag contains 50% CaO, the red mud contains 45% CaO, the manganese sand contains 45% MnO, and the zeolite purity is 90%. The pyrite slag and the above-mentioned solid waste-based cementitious material are fully mixed according to a ratio of 5:1, and 40% of the water is added, and the mold is put into compression molding and maintained for 24 days. HJ / T299-2007) in the weak acid environment to detect the heavy metal leaching, compressive strength and permeability coefficient of the consolidated body. The test results are shown in Table 2 below.

[0044] Control ...

Embodiment 2

[0050] The present embodiment provides a method for treating pyrite slag, comprising the following steps:

[0051] (1) Preparation of solid waste-based cementitious materials, including: 35% slag, 28% desulfurization gypsum, 16% steel slag, 10% red mud, 7% manganese sand and 4% zeolite. Among them, the slag quality coefficient K=1.4, the desulfurization gypsum contains 95% CaSO 4 , The steel slag contains 50% CaO, the red mud contains 45% CaO, the manganese sand contains 45% MnO, and the zeolite purity is 90%.

[0052] (2) Excavate the pyrite slag with a thickness of 50 cm on the top of the pyrite slag, and lay HDPE anti-seepage film at the bottom of the formed pit, and then mix the excavated pyrite slag with the solid waste-based cementitious material at a ratio of 5:1 Mix in the proportion of 40% water, and toss until the mixture is uniform in color.

[0053] (3) Backfill the mixture into the pit at the top of the pyrite slag pile, and use a press to press the mixture into...

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Abstract

The invention belongs to the technical field of environmental restoration, and particularly provides a solid waste-based cementing material for treating pyrite slag, which is characterized by comprising 35-45% of slag, 25-35% of desulfurized gypsum, 15-25% of steel slag, 10-15% of red mud, 5-10% of manganese sand and 3-5% of zeolite. The cementing material which is low in cost and excellent in performance is prepared by taking industrial solid waste as a basic raw material based on physical and chemical characteristics of the pyrite slag, can replace general cement and is specially used for cementing and curing the pyrite slag. In addition, the invention also provides a method for treating pyrite slag by using the exclusive solid waste-based cementing material, the pyrite slag heap is blocked in situ through a top layer curing and side seepage prevention process, the pyrite slag is prevented from being in contact with air and water, release and migration of pollution factors are reduced or even blocked from the source, and the effect of treating the pyrite slag is achieved. Meanwhile, acid leachate at the bottom of the pyrite slag is neutralized, and the risk that pollutants corrode and damage an anti-seepage structure is reduced.

Description

technical field [0001] The invention belongs to the technical field of environmental restoration, and in particular relates to a solid waste-based cementitious material for processing pyrite slag and a method for using the same. Background technique [0002] Pyrite refers to the collective name of a series of minerals composed of iron and sulfur, mainly including pyrite (FeS 2 ), pyrrhotite (FeS), etc., are the main minerals used to make sulfuric acid in nature. Due to the long-term exposure to the air, the mined pyrite slag can be oxidized to generate a large amount of sulfate-containing solution under the action of oxygen and moisture, commonly known as "acid mine wastewater", which continues to erode the soil and water bodies in the mining area, resulting in environmental acidification. At the same time, during the oxidative decomposition of pyrite slag, more heavy metal ions (such as Fe 3+ , Mn 2+ , Pb 2+ , Zn 2+ , Cu 2+ ), which continuously pollutes the soil and ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14
CPCC04B28/144C04B2111/00017C04B2111/00775C04B2111/00784C04B2201/50C04B18/142C04B18/141C04B18/12C04B18/0409C04B14/047Y02P40/10
Inventor 许晓明胡国峰郭华军姜明明刘子豪向浩邵雁夏阳汪远熊劲皮鎏
Owner CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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