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 removal, etc., can solve problems such as resource shortage and environmental degradation, and achieve high compressive strength, significant environmental benefits and economic benefits Effect
Inactive Publication Date: 2013-01-16
云南华威废弃物资源化有限公司
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A large number of natural resources such as sand and stone are exploited, causing resource shortage and environmental degradation
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[0017] In each embodiment, the mass percentage of each component is: construction waste ash 50%-80%, foundry waste sand 10%-30%, sludge 10%-20%, wherein, in construction waste ash, each component The mass percentage is: waste concrete fine slag ash 35-45%, waste brick and tile fine slag ash 25-35%, waste dry mortar fine slag ash 8-12%, sandy soil 8-12%, other impurities 5- 10%, the specific technical parameters of each embodiment are shown in Table 2, and the concrete method steps are as follows:
[0018] (1) Raw material preparation, construction waste is sorted, impurity removed, crushed and sieved, and made into various recycled building materials according to different particle sizes. In order to meet the above requirements of construction waste ash; collect foundry waste sand, remove metal and other sundries; dry the dehydrated sludge, and use an electric blast drying oven at 105°C for 6 hours to obtain dry sludge;
[0019] (2) The three raw materials are dried until the...
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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 construction waste residue, foundry waste sand and sludge. Background technique [0002] In recent years, the world's building materials are gradually developing towards reducing the weight of building materials and improving the thermal insulation capacity of building materials. Light aggregate is also called light aggregate, generally refers to loose bulk density less than 1000 kg / m 3 porous aggregates. It is mainly used to prepare light 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 ranks of priority development due to its advantages of light weight, high strength, fire prevention, sound insulation, and wear resistance. ...
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IPC IPC(8): B09B3/00C04B18/30
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