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A kind of steel slag-cyanide tailings cementitious material and its preparation method and application

A technology for cyanide tailings and cementitious materials, which is applied in chemical instruments and methods, sustainable waste treatment, solid waste management, etc. Simple preparation method

Active Publication Date: 2022-02-08
HEBEI UNIV OF ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Steel slag is one of the main solid wastes produced in the process of steel production. Due to the large amount of molten material discharged after lime is used to extract impurities in steelmaking, its discharge is about 12% to 20% of crude steel output. In recent years my country's annual discharge of steel slag is about 70 to 80 million tons, but its utilization rate is less than 40%

Method used

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  • A kind of steel slag-cyanide tailings cementitious material and its preparation method and application
  • A kind of steel slag-cyanide tailings cementitious material and its preparation method and application
  • A kind of steel slag-cyanide tailings cementitious material and its preparation method and application

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preparation example Construction

[0035] The preparation method of described iron selection waste slag comprises the following steps:

[0036] Step 1. After the original steel slag is carbonized in a concrete carbonization box for 24-72 hours, it is crushed by a jaw crusher, and then ground by a ball mill to a size smaller than 2 mm to form steel slag powder;

[0037] Step 2. Mix steel slag powder and cyanide tailings 1:1, and separate them into iron powder 1 and mixture 1 by dry strong magnetic roller; wherein, the magnetic field strength is 1.5-2T, and the magnetic separator speed is 10-20r / min;

[0038] Step 3. Grind the mixture 1 to 100-200m 2 / kg, divided into: 100~160m by winnowing 2 / kg of coarse slag 1 and 160~200m 2 / kg fine slag;

[0039] Step 4, continue to separate the coarse slag 1 by dry-type weak magnetic rollers into: coarse slag 2 and iron powder 2; wherein, the magnetic field strength is 50-80mT, and the magnetic separator speed is 10-20r / min;

[0040] Step 5. Mix fine slag and coarse s...

Embodiment 1

[0047] A steel slag-cyanide tailings cementitious material is composed of the following substances in mass percentage:

[0048]

[0049] The preparation method of the iron selection waste slag comprises the following steps: after the original steel slag is carbonized in a concrete carbonization box for 48 hours, it is crushed by a jaw crusher, and then ground by a ball mill to a size less than 2 mm to form steel slag powder; 1:1 mixing, the mixture is separated into iron powder 1 and mixture 1 by a magnetic field strength of 1.5T, and a magnetic separator with a speed of 10-20r / min. 200m 2 / kg, divided into: 100~160m by winnowing 2 / kg of coarse slag 1 and 160~200m 2 / kg of fine slag; the coarse slag 1 is separated into: coarse slag 2 and iron powder 2 by a dry weak magnetic roller with a magnetic field strength of 50mT and a magnetic separator rotating speed of 15r / min; after mixing the fine slag and coarse slag 2 Grind to 400-800m by vibrating ceramic mill 2 / kg to fo...

Embodiment 2

[0060] A steel slag-cyanide tailings cementitious material is composed of the following substances in mass percentage:

[0061]

[0062]

[0063] The preparation method of described iron selection waste slag comprises the following steps:

[0064] After the original steel slag is carbonized in the concrete carbonization box for 24 hours, it is crushed by a jaw crusher, and then ground by a ball mill to a size less than 2 mm to form steel slag powder; the steel slag powder and cyanide tailings are mixed at a ratio of 1:1, and the mixture is passed through a magnetic field with a strength of 1.8T, the speed of the magnetic separator is 10-20r / min, and the dry-type strong magnetic roller is separated into: iron powder 1 and mixture 1; the mixture 1 is ground to 100-200m 2 / kg, divided into: 100~160m by winnowing 2 / kg of coarse slag 1 and 160~200m 2 / kg of fine slag; the coarse slag 1 is separated into: coarse slag 2 and iron powder 2 by a dry weak magnetic roller with a ...

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Abstract

The invention proposes a steel slag-cyanide tailings cementitious material and its preparation method and application. The steel slag-cyanide tailings cementitious material is composed of the following substances in mass percentage: 30-60% of iron-selected waste slag, 10-20% of aerated concrete waste, 15-25% of calcium carbide slag, and 10-30% of desulfurized gypsum %. Carbide slag is calcined, cooled naturally, and ground; aerated concrete waste is crushed, dried, and ground; after desulfurization gypsum is ground, it is mixed with steel slag-cyanide tailings iron selection waste in proportion to prepare steel slag-cyanide tailings cementitious material. The cementitious material is mixed with portland cement to prepare steel slag-cyanide tailings cement. The preparation method of the invention is simple and easy to implement, can realize the coordinated utilization of various wastes, increase the added value of the wastes, reduce the production cost of cement, and has good social and economic effects.

Description

technical field [0001] The invention belongs to the technical field of metal recycling, and in particular relates to a steel slag-cyanide tailings cementitious material and a preparation method and application thereof. Background technique [0002] Cyanide slag is the waste slag discharged after domestic gold smelting. The national gold industry discharges a large amount of cyanide slag every year. With the continuous development of production, the annual discharge of cyanide slag has increased. Especially in recent years, with the continuous improvement of the production process, the cyanidation method has been widely used, and the corresponding large discharge of cyanidation tailings has brought some serious problems. Whether it is the cyanide tailings of flotation gold concentrate or the whole mud cyanide slag, the common feature is that the particle size of the slag is very fine. More than 99% of the gold mines are less than 350 mesh, and more than 80% of the gold mines...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/16C04B28/04B03C1/02
CPCC04B40/0039C04B28/04B03C1/02C04B2111/00017C04B18/12C04B18/16C04B18/0427C04B18/064C04B18/142C04B18/0463Y02W30/91
Inventor 王长龙叶鹏飞李军高颖尹艺臻张凯帆张亚鹏霍泽坤王绍熙任真真赵高飞
Owner HEBEI UNIV OF ENG
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