Construction waste comprehensive utilization method
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A technology of construction waste and new method, which is applied in the direction of calcium/strontium/barium halide, silicon dioxide, calcium/strontium/barium chloride, etc. effect of development
Inactive Publication Date: 2017-08-15
SHANDONG UNIV OF SCI & TECH
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[0007] To sum up, the existing construction waste treatment methods at home and abroad are not out of the scope of physical methods. The most and most extensive way is to prepare recycled aggregates and recycled building materials through a series of physical methods (sorting, crushing) , however, these methods can never be repeated, because most of the performance of construction waste has declined after such treatment. When these recycled building materials become construction waste again, where will they go?
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Embodiment 1
[0028] Take 5g of the concrete sample crushed to 200 mesh, put it into a 250ml beaker, mix with 20ml of 1:1 HCl (hydrochloric acid obtained by mixing 1 volume of concentrated hydrochloric acid with 1 volume of water, the concentration is about 6mol / L), mix and boil for 1 hour, filter , to obtain filtrate 1 and filter residue 1, with a decomposition rate of 29%.
[0029] The filtrate after water dissolving and filtering is the Ca(OH) of 5% with mass percentage concentration 2 Adjust the pH of the emulsion to 4, filter and separate the reddish-brown precipitated ferric hydroxide, continue with 5% Ca(OH) 2 The pH of the emulsion was adjusted to 7, and the white flocculent precipitated aluminum hydroxide was separated by filtration, and then the filtrate was evaporated to dryness at 300°C to obtain white solid calcium chloride with strong water absorption.
[0030] Dissolve the filtered filter residue 1 in water, add 6ml of fluosilicic acid with a mass percentage concentration of...
Embodiment 2
[0033] In the enamel reaction kettle, add 4mol / L hydrochloric acid 2m 3 (cubic), under constant stirring, slowly add 1t of concrete samples crushed to 120 mesh, filter after stirring and reacting for 1 hour, and obtain filtrate and solid after entering the filter press for separation.
[0034] Filtrate with 20% Ca(OH) 2 Adjust the pH to 4, Fe(OH) 3 Basically completely precipitate out, filter to get Fe(OH) 3 solid and filtrate, adjust the pH of the filtrate to 7, Al(OH) 3 Almost completely precipitated, filtered to obtain Al(OH) 3 Solid and filtrate, only CaCl in the filtrate at this time 2 , evaporated to dryness at 300°C to obtain CaCl 2 solid.
[0035] Solid 0.7t with 30% fluosilicic acid according to 4m 3 The ingredients are mixed and reacted in the reactor, and evaporated to dryness at 150°C to obtain volatile gas. Reference patent: CN201310534326.8 (CN103588209A) A comprehensive utilization method for recovering SiF4 gas to produce white carbon black, and the abso...
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Abstract
The invention discloses a novel construction waste comprehensive utilization method. The novel construction waste comprehensive utilization method comprises following steps: a, construction waste is smashed, and is mixed with hydrochloric acid, an obtained mixture is heating to boiling for 0.5 to 3h of reaction, and filtering is carried out so as to obtain a filtrate 1 and a filter residue 1; b, the pH value of the filtrate 1 is adjusted to 4 with a calcium hydrate emulsion, filtering is carried out so as to obtain iron hydroxide via separation, the pH value of an obtained mixed material is adjusted to 7 with the calcium hydrate emulsion continuously, filtering is carried out so as to obtain aluminium hydroxide via separation, and an obtained filtered solution is subjected to evaporation so as to obtain calcium chloride or calcium chloride dehydrate; c, the filter residue 1 is mixed and reacted with fluosilicic acid, evaporation is carried out so as to obtain a volatile gas and a solid substance, the volatile gas is subjected to absorption so as to obtain white carbon black, the solid substance is mixed with water, and is subjected to grinding, hydrochloric acid is added, an obtained product is heated to boiling and is filtered so as to obtain a filtrate 4 and a filter residue 2; and d, the pH value of the filtrate 4 is adjusted to 2 with the calcium hydrate emulsion, and then is mixed with the filtrate 1. According to the novel construction waste comprehensive utilization method, construction waste is taken as the raw material, and a series of chemical products, such as water, silicon dioxide, aluminium hydroxide, iron hydroxide, and calcium chloride, are obtained via low temperature chemical decomposition, and waste is changed into valuables.
Description
technical field [0001] The invention relates to a new method for comprehensive utilization of construction waste, which belongs to the field of construction waste recycling. Background technique [0002] Construction waste refers to the main solid waste generated during the construction, maintenance and demolition of buildings, mainly including waste concrete blocks, waste and broken bricks and other wastes. With the continuous acceleration of my country's national economy and urbanization process, according to statistics, every 10,000 square meters of construction will generate 500-600 tons of construction waste. According to the calculation of my country's annual construction scale of 2 billion square meters, only construction The generated construction waste exceeds 100 million tons, and construction waste has become the second largest solid waste after municipal solid waste. Most of these construction wastes are discarded without any treatment, which has brought serious ...
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