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Silica sol modified ferrochrome slag aggregate and preparation method thereof
The preparation method comprises the following steps: carrying out acid pickling treatment on rice hull ash by adopting a sol-gel method to remove metal ions, drying, adding a NaOH solution, stirring and filtering to obtain a brown sodium silicate solution; adjusting the pH value of the water glass solution to 8-10 by acid titration, aging and centrifuging to obtain nano-silica sol gel, drying and grinding for later use; the preparation method comprises the following steps: preparing a certain fraction of silica sol solution from nano silica sol, dispersing in an ultrasonic cleaning machine, and then immersing and fully soaking the ferrochrome slag aggregate; adding a modifier and a cross-linking agent into the fully soaked solution to reinforce the aggregate, and adding a small amount of an initiator and an accelerant to accelerate the reaction; and curing the modified aggregate in a specific environment, and drying and curing for later use. The modification method is green, environment-friendly, simple in process, low in cost, safe and non-toxic. The surface pores of the obtained modified ferrochrome slag aggregate are obviously reduced, and the crushing value and the water absorption rate are obviously reduced. Concrete prepared from the modified ferrochrome slag aggregate has more stable and reliable performance, and is expected to achieve more excellent permeability resistance, durability and strength performance especially in high-performance concrete application.
本发明涉及一种硅溶胶改性铬铁渣骨料及其制备方法，包括以下步骤：采用溶胶‑凝胶法对稻壳灰酸洗处理以去除金属离子，烘干后加入NaOH溶液搅拌过滤得到棕色的硅酸钠溶液。用酸滴定将水玻璃溶液pH调节至8～10后经陈化离心得出纳米硅溶胶凝胶，烘干后研磨备用；将纳米硅溶胶配置成一定分数的硅溶胶溶液并在超声清洗机下分散，随后将铬铁渣骨料浸入并充分浸泡；在充分浸泡的溶液中加入改性剂和交联剂以强化骨料，加入少量引发剂和促进剂加速反应进行；将改性后的骨料放入特定环境养护后烘干固化备用。本改性方法绿色环保、工艺简单、成本低廉、安全无毒。得到的改性铬铁渣骨料表面孔隙明显减少，压碎值和吸水率显著降低。改性后的铬铁渣骨料制备的混凝土具有更为稳定和可靠的性能，尤其在高性能混凝土应用中，有望实现更优异的抗渗透性、耐久性和强度表现。
Silica sol modified ferrochrome slag aggregate and preparation method thereof
The preparation method comprises the following steps: carrying out acid pickling treatment on rice hull ash by adopting a sol-gel method to remove metal ions, drying, adding a NaOH solution, stirring and filtering to obtain a brown sodium silicate solution; adjusting the pH value of the water glass solution to 8-10 by acid titration, aging and centrifuging to obtain nano-silica sol gel, drying and grinding for later use; the preparation method comprises the following steps: preparing a certain fraction of silica sol solution from nano silica sol, dispersing in an ultrasonic cleaning machine, and then immersing and fully soaking the ferrochrome slag aggregate; adding a modifier and a cross-linking agent into the fully soaked solution to reinforce the aggregate, and adding a small amount of an initiator and an accelerant to accelerate the reaction; and curing the modified aggregate in a specific environment, and drying and curing for later use. The modification method is green, environment-friendly, simple in process, low in cost, safe and non-toxic. The surface pores of the obtained modified ferrochrome slag aggregate are obviously reduced, and the crushing value and the water absorption rate are obviously reduced. Concrete prepared from the modified ferrochrome slag aggregate has more stable and reliable performance, and is expected to achieve more excellent permeability resistance, durability and strength performance especially in high-performance concrete application.
本发明涉及一种硅溶胶改性铬铁渣骨料及其制备方法，包括以下步骤：采用溶胶‑凝胶法对稻壳灰酸洗处理以去除金属离子，烘干后加入NaOH溶液搅拌过滤得到棕色的硅酸钠溶液。用酸滴定将水玻璃溶液pH调节至8～10后经陈化离心得出纳米硅溶胶凝胶，烘干后研磨备用；将纳米硅溶胶配置成一定分数的硅溶胶溶液并在超声清洗机下分散，随后将铬铁渣骨料浸入并充分浸泡；在充分浸泡的溶液中加入改性剂和交联剂以强化骨料，加入少量引发剂和促进剂加速反应进行；将改性后的骨料放入特定环境养护后烘干固化备用。本改性方法绿色环保、工艺简单、成本低廉、安全无毒。得到的改性铬铁渣骨料表面孔隙明显减少，压碎值和吸水率显著降低。改性后的铬铁渣骨料制备的混凝土具有更为稳定和可靠的性能，尤其在高性能混凝土应用中，有望实现更优异的抗渗透性、耐久性和强度表现。
Silica sol modified ferrochrome slag aggregate and preparation method thereof
一种硅溶胶改性铬铁渣骨料及其制备方法
RONG ZHIDAN (author) / HU HAO (author)
2024-06-14
Patent
Electronic Resource
Chinese
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