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Aerated concrete block produced by iron ore tailings and preparation method thereof

A technology of aerated concrete and iron ore tailings, which is applied in the direction of manufacturing tools, climate sustainability, sustainable waste treatment, etc., can solve the problems of secondary pollution of iron concentrate, large amount of cement consumption, high cost, etc., and achieve low cost , small amount of cement, the effect of resource utilization

Inactive Publication Date: 2012-09-12
WUHAN INSTITUTE OF TECHNOLOGY +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of iron ore tailings aerated concrete block and its preparation method, to solve the problem of large amount of cement used in the preparation of building materials with iron ore tailings as the main raw material, high cost, and the problems caused by recycling iron concentrates. The problem of secondary pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for preparing an iron ore tailings aerated concrete block, comprising the following steps:

[0024] The iron ore tailings aerated concrete blocks were prepared from the iron ore tailings of Meishan Iron Mine.

[0025] 1) Preparation of activated iron ore tailings: firstly, it (the iron ore tailings of Meishan Iron Mine) is activated, and the magnetite formed during the activation process is separated by dry magnetic separation. ① The specific process of activation treatment is as follows:

[0026] Press filtration and drying: Dewater the iron ore tailings slurry with a press filter equipment (a plate and frame filter press is used here), and the iron ore tailings are processed by press filtration to obtain a tailings filter cake with a moisture content of 17wt%; The tailings filter cake was put into an oven and dried at 110° C. for 8 hours, and the moisture content of the dried tailings was 3 wt%, to obtain the dried tailings.

[0027] Calcination and dry que...

Embodiment 2

[0036] A method for preparing an iron ore tailings aerated concrete block, comprising the following steps:

[0037] 1) Preparation of activated iron ore tailings: Iron ore tailings aerated concrete blocks are prepared from the iron ore tailings of Meishan Iron Mine. First, it is activated and separated by dry magnetic separation. formed magnetite.

[0038] ① The specific process of activation treatment is as follows:

[0039] Press filtration and drying: can carry out with reference to the step in embodiment 1;

[0040] Calcination and cooling: Mix the dry tailings with 4% coal (coal powder) by mass, mix well, and calcinate at 700°C for 1 hour with a heating rate of 20°C / min; cool it quickly with flowing air after taking it out, The gas-solid separation is realized by dust collection.

[0041] ②Magnetic separation: The iron ore tailings that have been calcined and cooled are subjected to dry magnetic separation to separate the iron concentrate, and the remaining materials a...

Embodiment 3

[0049] A method for preparing an iron ore tailings aerated concrete block, comprising the following steps:

[0050] 1) Preparation of activated iron ore tailings: Iron ore tailings aerated concrete blocks are prepared from the iron ore tailings of Meishan Iron Mine. First, it is activated and separated by dry magnetic separation. formed magnetite.

[0051] ① The specific process of activation treatment is as follows:

[0052] Press filtration and drying: can carry out with reference to the step in embodiment 1;

[0053] Calcination and cooling: Mix dry tailings with 6% coal by mass, mix evenly, and calcinate at 700°C for 1 hour with a heating rate of 18°C / min; way to achieve gas-solid separation.

[0054] ②Magnetic separation: The iron ore tailings that have been calcined and cooled are subjected to dry magnetic separation to separate the iron concentrate, and the remaining materials are activated iron ore tailings used to prepare iron ore tailings aerated concrete blocks ...

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Abstract

The invention relates to the technical field of iron ore tailings treatment, in particular to an aerated concrete block produced by iron ore tailings and a preparation method thereof. The aerated concrete block produced by iron ore tailings is characterized in that the aerated concrete block is prepared by activated iron ore tailings, lime, ordinary Portland cement, gypsum, aluminum powder and water; the weight percentage of the raw materials is as follows: 60% to 65% of the activated iron ore tailings, 17% of the lime, 15% to 20% of the ordinary Portland cement and 13% of the gypsum; the sum of the weight percents of the activated iron ore tailings, the lime, the ordinary Portland cement and the gypsum is 100%; the addition quantity of the aluminum powder is 0.08% of the total weight of the activated iron ore tailings, the lime, the ordinary Portland cement and the gypsum; and the ratio of water and materials is 0.6-0.65. The aerated concrete block produced by iron ore tailings and the preparation method thereof solve the problems of large quantity and high cost of building material cement by using iron ore tailings as main raw materials and secondary pollution caused by recycling of iron core concentrate currently.

Description

technical field [0001] The invention relates to the technical field of iron ore tailings treatment, in particular to an aerated concrete block made from iron ore tailings and a preparation method thereof. Background technique [0002] With the rapid growth of the steel industry, the demand for iron ore is increasing, and the tailings produced by iron ore beneficiation are also increasing. Tailings not only occupy a large amount of valuable land resources, but also pose a safety threat to tailings dams near towns. Even if an accident occurs in a tailings dam far away from residential areas, it will cause huge pollution to the environment. Therefore, how to turn waste into treasure and utilize iron ore tailings resources has become a problem that people pay more and more attention to. [0003] With the rapid development of my country's economy, the demand for steel is also rising day by day, and the resulting large amount of industrial waste in the form of iron ore tailings h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/04C04B18/12B28B11/14
CPCY02W30/91
Inventor 曹宏向后奎薛俊高伦石和彬李先福甘茂武
Owner WUHAN INSTITUTE OF TECHNOLOGY
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