Circulating fluidized bed slag resource utilization method
A circulating fluidized bed and recycling technology, which is applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of expansion cracking and low utilization rate, achieve strength improvement and improve resource utilization rate , important environmental value and economic effect
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Embodiment 1
[0030] The original CFB slag used in this example has a CaO content of 7.33%, SO 3 The content is 6.19%; the particle size distribution is shown in Table 1 below:
[0031] Table 1
[0032] particle size <0.6
0.6-1.18 1.18-2.36 2.36-4.75 CFB slag 39.71 19.43 23.04 17.82
[0033] 1) Preliminary sorting
[0034] CFB slag with a particle size less than 0.6mm was obtained through 0.6mm sieve sorting, and its CaO content was 13.57%, SO 3 content of 12.62%; CFB slag with a particle size of more than 0.6mm, its CaO content is 3.22%, SO 3 The content is 1.95%.
[0035] 2) Preparation of expansion agent
[0036] The composition and mass fraction of the expansion agent are: 60 parts of CFB slag with a particle size of less than 0.6 mm, 20 parts of anhydrite, 10 parts of quicklime, and 10 parts of CFB fly ash. The above-mentioned raw materials were mixed and ground with a ball mill for 30 min to obtain a concrete expansion agent.
[0037] The specific su...
Embodiment 2
[0044] The present embodiment provides concrete based on the CFB slag above 0.6mm obtained in Example 1 and the fine aggregate of machine-made sand, and is compared with ordinary concrete, wherein the specific mixing ratio is shown in Table 3 below:
[0045] table 3
[0046]
[0047] *: Because the water absorption rate of CFB slag is higher than that of machine-made sand, the total water consumption of concrete is slightly higher than that of original concrete under equal slump.
[0048] The compressive strength properties of the two types of concrete in this example are: the compressive strengths of the original concrete 7d and 28d are 34.89MPa and 45.53MPa respectively; the 7d and 28d compressive strengths of the adjusted CFB slag concrete are 35.42MPa and 47.91MPa respectively, and the strength is slightly improved . The unilateral cost of the adjusted concrete is 52.3 yuan lower than that of the original concrete, which has better economic benefits.
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