A kind of fired brick and preparation method thereof

A technology for sintering bricks and bricks, applied in the field of sintering bricks and their preparation, can solve the problems of high pulverized coal price, great influence on the cost of sintering bricks, unfavorable product market competitiveness, etc., and achieve the effect of reducing costs and saving resources

Active Publication Date: 2016-06-29
NANJING IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high price of pulverized coal, it has a great impact on the cost of producing sintered bricks, which is not conducive to improving the market competitiveness of products. Satisfied performance conditions such as temperature, plasticity, etc., cannot be satisfied by the raw materials themselves

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] This embodiment provides a kind of sintered brick, which comprises the following components in parts by mass: 80 parts of tailings, 20 parts of coal slime, wherein, after the tailings and coal slime are mixed, the SiO 2 The content is 60%, Al 2 o 3 content of 8%, CaO content of 4%, MgO content of 3%, Fe 2 o 3 The content of minerals is 8%, the content of other minerals is 9%, and the loss on ignition is 8%.

[0048] The preparation method of sintered brick in the present embodiment specifically comprises the following steps:

[0049] a: Concentrate and dehydrate the tailings and coal slime to a water content of 15%, then put the dehydrated tailings and coal slime into the mixer and stir slowly at a stirring speed of 201 rpm. After stirring for 13 minutes, pour Slowly add water to the mixer for wet mixing, and adjust the speed of the mixer to 482 rpm, and the mixing time is 16 minutes. It is ready to use when the raw materials are muddy by visual inspection;

[0050...

Embodiment 2

[0055] This embodiment provides a kind of sintered brick, which comprises the following components in parts by mass: 85 parts of tailings, 15 parts of coal slime, wherein, after the tailings and coal slime are mixed, the SiO 2 The content is 70%, Al 2 o 3 content of 6%, CaO content of 3%, MgO content of 4%, Fe 2 o 3 The content of other minerals is 5%, the content of other minerals is 7%, and the loss on ignition is 5%.

[0056] The preparation method of sintered brick in the present embodiment specifically comprises the following steps:

[0057] a: Concentrate and dehydrate the tailings and coal slime to a water content of 13% first, then put the dehydrated tailings and coal slime into an inverted mixer and stir slowly at a stirring speed of 200 rpm for 14 minutes. Slowly add water to the mixer for wet mixing, and adjust the speed of the mixer to 480 rpm, and the mixing time is 17 minutes. It is ready to use when the raw material is muddy;

[0058] b: Send the muddy raw ...

Embodiment 3

[0063] This embodiment provides a kind of sintered brick, which comprises the following components in parts by mass: 82 parts of tailings, 18 parts of coal slime, wherein, after the tailings and coal slime are mixed, the SiO 2 The content is 63%, Al 2 o 3 content of 10%, CaO content of 2%, MgO content of 1%, Fe 2 o 3 The content of minerals is 9%, the content of other minerals is 6%, and the loss on ignition is 9%.

[0064] The preparation method of sintered brick in the present embodiment specifically comprises the following steps:

[0065] a: First concentrate and dehydrate the tailings and coal slime to a moisture content of 14%, then put the dehydrated tailings and coal slime into the mixer and stir slowly at a stirring speed of 202 rpm. After stirring for 12 minutes, pour Slowly add water to the mixer for wet mixing, and adjust the speed of the mixer to 481 rpm, and the mixing time is 15 minutes. It is ready to use when the raw material is muddy by visual inspection; ...

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Abstract

The invention discloses a production of sintered bricks with tailings as the main raw material and a preparation method thereof. The invention uses fine-grained tailings and mixes a certain proportion of coal slime and coal gangue as raw materials, so that the SiO2 content in the mixture is between 50 -70%, the content of Al2O3 is between 6-20%, the content of CaO is less than 6%, the content of MgO is less than 6%, and its calorific value is controlled at 1.465-1.780MJ / Kg, so that the mixture gradation is reasonable and meets the requirements of sintered bricks. The required plasticity and heat generation requirements. The invention has the effect that the mixture overcomes the defects of tailings, coal slime and coal gangue as raw materials for sintered bricks, optimizes the mineral composition and physical properties of raw materials, realizes the comprehensive utilization of mine fine tailings, and is also beneficial Reduce the cost of fired bricks.

Description

technical field [0001] The invention belongs to the technical field of production of sintered bricks, in particular to an energy-saving and environment-friendly sintered brick with fine-grained tailings as the main raw material and a preparation method thereof. Background technique [0002] Sintered bricks are extruded clay bricks sintered at a certain temperature. Traditional sintered bricks are generally made of coal gangue, shale, fly ash and soil and other raw materials. Clay is used as the main raw material to produce sintered bricks. It is the most traditional method, which is to mix a certain proportion of coal powder in the clay, which has been banned by the state in recent years. With the continuous improvement of the country's environmental protection and circular economy requirements, the use of tailings to produce new building materials has developed rapidly, and there have been iron tailings, copper tailings, gold tailings, molybdenum tailings, zinc tailings, et...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B30/00C04B18/30
CPCY02W30/91
Inventor 范庆霞胡海洋陆云淡
Owner NANJING IRON & STEEL CO LTD
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