Method for preparing high-strength lightweight aggregate by use of building waste residue, casting waste sand and sludge

A technology of construction waste slag and foundry waste sand, which is applied in the direction of construction waste recycling, recycling technology, solid waste management, etc., can solve problems such as environmental degradation and resource shortage, and achieve high compressive strength, significant environmental benefits and economic benefits. Effect

Inactive Publication Date: 2011-10-19
云南华威废弃物资源化有限公司
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Problems solved by technology

A large number of natural resources such as sand and stone are exploited, causing resource shortage and environmental degradation

Method used

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  • Method for preparing high-strength lightweight aggregate by use of building waste residue, casting waste sand and sludge

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Embodiment Construction

[0017] In each embodiment, the mass percentage of each component is: construction waste ash 50%-80%, foundry waste sand 10%-30%, sludge 10%-20%, among which, each component in construction waste ash The percentage by mass is: 35-45% of waste concrete slag, 25-35% of waste brick slag, 8-12% of waste dry mortar slag, 8-12% of sandy soil, and other impurities 5- 10%, the specific technical parameters of each embodiment are shown in Table 2. The specific method steps are as follows:

[0018] (1) Material preparation, construction waste is sorted, impurity removed, crushed and sieved, and made into various renewable building materials according to the different particle diameters. The remaining fine slag ash is screened into construction waste ash, and its composition is tested and prepared In order to meet the above requirements of construction waste ash; collect foundry waste sand to remove metal and other impurities; dehydrated sludge is dried and dried at 105°C for 6 hours in an e...

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Abstract

A method for preparing a high-strength lightweight aggregate by the use of building waste residue, casting waste sand and sludge comprises the following steps of: (1) taking the building waste residue, casting waste sand and sludge as raw materials; (2) drying the raw materials, followed by ball milling, and adding throughs into water with uniformly mixing; (3) extruding the raw materials for molding; (4) sintering: drying a blank material at the temperature of 105 DEG C for 5-6 hours, heating to the temperature of 450 DEG C, keeping warm for at least 10 minutes, heating up to the temperatureof 1125-1150 DEG C to roast for at least 10 minutes, and stopping heating; (5) naturally cooling to room temperature so as to obtain the high-strength lightweight aggregate. The produced high-strength lightweight aggregate in the invention completely meets the high-strength lightweight aggregate standard in Lightweight Aggregate and its Test Method GB / T17431.2-1998. According to the invention, building waste, industrial waste and waste generated from city or industrial sewage are taken as the raw materials to prepare the lightweight aggregate for buildings. By the adoption of the high-strength lightweight aggregate, problems such as the environmental pollution due to the difficulty of processing building waste residue, used sand regenerating dust and sludge are solved. In addition, the high-strength lightweight aggregate, which is prepared by using waste as the raw materials, replaces building materials prepared by natural raw materials to change waste into valuables, and has obvious environmental benefit and economic benefit.

Description

Technical field [0001] The invention relates to a method for preparing building materials, in particular to a method for preparing high-strength lightweight aggregates by using building waste residue, foundry waste sand and sludge. Background technique [0002] In recent years, the world's building materials have gradually developed in the direction of reducing the weight of building materials and improving the thermal insulation capacity of building materials. Lightweight aggregate is also called light aggregate, generally refers to loose bulk density less than 1000 kg / m 3 Of porous aggregate. It is mainly used to prepare lightweight aggregate concrete, thermal insulation mortar and refractory concrete, etc. It can also be used as thermal insulation loose filler. As one of the main products of new building materials, lightweight aggregate has entered the priority list for its advantages of light weight, high strength, fire resistance, sound insulation, and wear resistance. The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/30
CPCY02W30/58Y02W30/91
Inventor 李如燕尚江涛宋平
Owner 云南华威废弃物资源化有限公司
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