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A method of processing waste concrete to make active slag powder and aggregate by vertical kiln

A technology of waste concrete and active slag, which is applied in the direction of sustainable waste treatment, clinker production, solid waste management, etc., can solve the problems of social wealth waste, unemployment rate, and rising, so as to protect the social ecological environment and natural environment, and realize resource utilization. The effect of recycling and reducing inferior cement and bean curd residue projects

Active Publication Date: 2017-10-10
湖南省小尹无忌环境能源科技开发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Furthermore, the original shaft kiln cement line with large volume and wide area was eliminated and stopped production, which actually caused a huge waste of social wealth and a rise in unemployment rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Using a φ3×8m shaft kiln cement production line process equipment that has just been shut down to be dismantled, the active slag powder and active aggregate are produced according to the following steps:

[0039] (1) Preparation of raw and fuel materials: Waste concrete is waste concrete taken from residential houses dismantled and discarded in mountainous areas. It is detected that waste concrete blocks contain waste brick construction waste that is not easy to remove, and the average mass of waste concrete accounts for 82.1% %. The mass of waste bricks accounted for 17.9%. The waste concrete materials consisted of limestone coarse aggregate, quartz sand fine aggregate and ordinary cement, and waste bricks were burnt clay bricks and cinder cement bricks. Crush the waste concrete to ≤30mm, remove the reinforcement, and use it as a raw material; use rod-shaped coal with a particle size of 20mm as fuel;

[0040] (2) Activation roasting: put the obtained granular waste con...

Embodiment 2

[0048] Using the φ2.8×7.8m vertical kiln cement production line process equipment in operation in a certain valley, the active slag powder and active aggregate are produced according to the following steps:

[0049] (1) Preparation of raw and fuel materials: waste concrete is taken from the abandoned highway repair and dismantling waste concrete, and the components of the waste concrete are detected as limestone coarse aggregate, quartz sand fine aggregate and ordinary cement. Crush waste concrete to ≤30mm as raw material; use crushed stone coal with particle size <30mm as fuel.

[0050] (2) Activation roasting: put the obtained block granular waste concrete raw materials and block granular stone coal fuel into the vertical kiln with a hopper, and use 200KCal for each Kg of waste concrete raw material, adjust the amount of fuel according to the situation, and control the amount of fuel in the vertical kiln. The roasting temperature in the high-temperature section is 1000°C-128...

Embodiment 3

[0058] Using a certain φ3.8×8.5m shaft kiln cement production line equipment, the test of producing active slag powder and active aggregate was carried out according to the following steps:

[0059] (1) Preparation of raw and fuel materials: waste concrete is taken from the waste concrete dismantled and disposed of in the mountainous area. It is detected that the waste concrete contains waste bricks that are not easy to remove. Among them, the average mass of waste concrete accounts for 62.8%, and waste bricks The mass accounted for 37.2%. The waste concrete materials consisted of limestone coarse aggregate, quartz sand fine aggregate and ordinary cement, and the waste bricks were fired clay bricks and cinder cement bricks. The waste concrete is crushed to <30mm as raw material; the granular anthracite crushed to a particle size of <40mm is used as fuel.

[0060] (2) Activation roasting: put the obtained block granular waste concrete raw materials and block granular fuel into ...

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Abstract

The invention relates to a method for preparing active slag powder and aggregate from treated waste concrete in a vertical kiln factory. According to the method, vertical kiln concrete production line process equipment is used; crushed waste concrete is roasted at 980 DEG C to 1280 DEG C in a vertical kiln; then, cleavability power grinding and sorting are carried out; active slag powder and active aggregate are prepared. The method has the advantages that the vertical kiln concrete production line equipment can be used; all ingredients of waste concrete components are simply, conveniently and effectively utilized at low cost; excellent active slag powder and excellent active aggregate with higher additional values and wide market purposes are produced.

Description

technical field [0001] The invention relates to the field of environmental protection and waste utilization, in particular to a method for using shaft kiln cement production line equipment to process waste concrete to produce active slag powder and aggregate. Background technique [0002] At present, the average daily production of waste concrete in my country has exceeded one million tons, and is growing at a rate of 8% per year. It is expected to reach 650-700 million tons by 2020. If these waste concrete cannot be reused well, it will not only destroy the ecological environment, but also be a huge waste of resources, and will further increase the production burden of the building materials industry. my country's cement output ranks first in the world, with a cement production capacity of nearly 2.8 billion tons in 2014. At the same time, raw materials such as limestone and clay required for cement production are facing a situation of resource scarcity. Using waste concre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/24C04B7/44C04B7/52C04B18/16
CPCY02P40/10Y02P40/121Y02W30/91
Inventor 尹无忌尹小林
Owner 湖南省小尹无忌环境能源科技开发有限公司
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