Alkali excited material cured iron tailings, preparation method therefor and use method

A technology of iron tailings and alkali excitation, which is applied in the field of alkali-activated materials to solidify iron tailings and its preparation and use, can solve problems such as mountain damage, non-renewable resources, and aggravate the greenhouse effect, and achieve the goal of improving utilization and reducing costs Effect

Inactive Publication Date: 2019-07-12
LIAONING TECHNICAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the production of cement and lime produces a large amount of greenhouse gases such as carbon dioxide, which intensifies the...

Method used

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  • Alkali excited material cured iron tailings, preparation method therefor and use method
  • Alkali excited material cured iron tailings, preparation method therefor and use method
  • Alkali excited material cured iron tailings, preparation method therefor and use method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0079] In this example, the following steps are followed to prepare alkali-excited material to solidify iron tailings sand

[0080] The first step is to take A50kg of air-dried iron tailings sand, lay it flat, crush the agglomerated iron tailings with a wooden mill, pass through a 2.36mm square-hole sieve, and weigh 1.2% according to the mass percentage based on the dry weight of iron tailings. 0.6kg of calcium carbide slag, 1.8kg of 3.6% blast furnace granulated slag, 0.3kg of 0.6% fly ash and 0.3kg of 0.6% red mud; the solidifying agent is mixed evenly and then mixed with iron tailings sand to obtain a mixed material;

[0081] The second step is to determine the optimum moisture content of 10.4% in accordance with the heavy-duty compaction test in the "Test Regulations for Inorganic Binder Stabilizing Materials for Highway Engineering" (JTG E51-2009);

[0082] The third step is to prevent the loss of moisture during the mixing process, adjust the moisture content to 11.4%, ...

Embodiment 2

[0095] The first step is to take A50kg of air-dried iron tailings sand, lay it flat, crush the agglomerated iron tailings with a wooden mill, pass through a 2.36mm square-hole sieve, and weigh 1.4% according to the mass percentage based on the dry weight of iron tailings. 0.7kg of calcium carbide slag of 4.2%, 2.1kg of 4.2% blast furnace granulated slag, 0.35kg of 0.7% fly ash and 0.35kg of 0.7% red mud. material;

[0096] In the second step, the optimum moisture content is determined to be 13.1% according to the heavy-duty compaction test in the "Highway Engineering Inorganic Binder Stabilizing Materials Test Regulations" (JTG E51-2009);

[0097] The third step is to prevent the loss of moisture during the mixing process, adjust the moisture content to 14.1%, mix the obtained moisture with the mixture in the first step, and spread the plastic cloth for 8 hours to obtain the alkali-excited material. Subgrade filler for solidified iron tailings sand;

[0098] In the unconfine...

Embodiment 3

[0102] The first step is to take A50kg of air-dried iron tailings sand, lay it flat, crush the agglomerated iron tailings with a wooden mill, pass through a 2.36mm square-hole sieve, and weigh 1.5% according to the mass percentage based on the dry weight of the iron tailings. 0.75kg of calcium carbide slag of 4.5%, 2.25kg of 4.5% blast furnace granulated slag, 0.375kg of 0.75% fly ash and 0.375kg of 0.75% red mud; after stirring the components of the curing agent evenly, they are mixed with iron tailings sand to obtain a mixed solution. material;

[0103] In the second step, the optimum moisture content is determined to be 14.2% according to the heavy-duty compaction test in the "Test Regulations for Inorganic Binder Stabilizing Materials for Highway Engineering" (JTG E51-2009);

[0104] The third step is to prevent the loss of moisture during the mixing process, adjust the moisture content to 15.2%, mix the obtained moisture with the mixture in the first step, and spread the ...

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Abstract

The invention relates to alkali excited material cured iron tailings, a preparation method therefor and a use method. The alkali excited material cured iron tailings comprise iron tailings and a curing agent which are in a corresponding proportioning ratio, wherein the curing agent comprises carbide slag, blast furnace granulated slag, flyash and red mud. The alkali excited material cured iron tailings are prepared through weighing various ingredients according to a proportioning ratio, carrying out uniform mixing to obtain a mixture, adding water into the mixture in a manner of adjusting themoisture content of the mixture to 11.4% to 17.7%, carrying out uniform stirring, and then, carrying out stewing for 4 to 8 hours. Corresponding use procedures are controlled, and the alkali excited material cured iron tailings are used as a road subbase material. According to the alkali excited material cured iron tailings, the preparation method therefor and the use method, the production process is simple, and recycling of wastes is achieved by applying raw materials such as the carbide slag and the red mud; and by applying the fine iron tailings to roadbed fillers, the utilization ratio ofthe fine iron tailings is increased, the cost of reconstruction and protection of tailing warehouses is reduced, and the engineering cost is reduced.

Description

[0001] Technical field: [0002] The invention belongs to the technical field, and in particular relates to an alkali-excited material-solidified iron tailing sand and a preparation method and a use method thereof. [0003] Background technique: [0004] With the gradual advancement of my country's ecological civilization construction, the problems of environmental pollution, land occupation, safe production and resource waste involved in the development of mineral resources have become increasingly prominent, which have attracted great attention from the state and society. According to incomplete statistics, there are more than 9,000 large and medium-sized mines and 260,000 small mines in my country. Due to the low utilization rate of mineral resources development and poor mineral processing technology in China, a large number of tailings are produced. There are 12,718 existing tailings ponds in my country, 1,526 tailings ponds under construction, and 1,024 closed tailings pon...

Claims

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Application Information

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IPC IPC(8): C04B28/00C04B40/02
CPCC04B28/006C04B2111/00017C04B2111/0075C04B2201/50C04B18/12C04B18/0427C04B18/141C04B18/08C04B18/0409C04B40/0259
Inventor 易富张智魏明俐
Owner LIAONING TECHNICAL UNIVERSITY
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