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Modification method and application of dry-process machine-made sand tailings
The invention discloses a modification method and application of dry-method machine-made sand tailings, and the preparation method comprises the following steps: (1) enabling machine-made sand produced by a dry-method sand making process to pass through a negative-pressure powder concentrator to adsorb and remove redundant stone powder in the machine-made sand to obtain the machine-made sand tailings; (2) drying the machine-made sand tailings until the water content of the machine-made sand tailings is less than 1.0%; (3) carrying out mechanical grinding until the fineness of 45 microns is lower than 30%; and (4) adding silica fume, continuing mechanical grinding, and uniformly mixing to obtain the modified machine-made sand tailings. The prepared modified machine-made sand tailing limestone powder is good in activity, the modified machine-made sand tailing limestone powder is added into cement concrete as a mineral admixture to replace part of fly ash, the cement consumption is reduced, and the prepared concrete is large in flowability, high in compactness and excellent in durability.
本发明公开了一种干法机制砂尾料的改性方法及用途，其制备步骤如下：(1)将干法制砂工艺生产出来的机制砂通过负压选粉机，吸附去除机制砂中多余的石粉，得机制砂尾料；(2)将机制砂尾料进行烘干，使其含水率小于1.0％；(3)进行机械粉磨至45μm细度低于30％；(4)加入硅灰，继续机械粉磨，混合均匀得改性机制砂尾料。制备的改性机制砂尾料石灰石粉活性好，将其作为矿物掺合料加入水泥混凝土中，替代部分粉煤灰，降低水泥用量，并且制备的混凝土流动性大、密实度高，且具有优异的耐久性。
Modification method and application of dry-process machine-made sand tailings
The invention discloses a modification method and application of dry-method machine-made sand tailings, and the preparation method comprises the following steps: (1) enabling machine-made sand produced by a dry-method sand making process to pass through a negative-pressure powder concentrator to adsorb and remove redundant stone powder in the machine-made sand to obtain the machine-made sand tailings; (2) drying the machine-made sand tailings until the water content of the machine-made sand tailings is less than 1.0%; (3) carrying out mechanical grinding until the fineness of 45 microns is lower than 30%; and (4) adding silica fume, continuing mechanical grinding, and uniformly mixing to obtain the modified machine-made sand tailings. The prepared modified machine-made sand tailing limestone powder is good in activity, the modified machine-made sand tailing limestone powder is added into cement concrete as a mineral admixture to replace part of fly ash, the cement consumption is reduced, and the prepared concrete is large in flowability, high in compactness and excellent in durability.
本发明公开了一种干法机制砂尾料的改性方法及用途，其制备步骤如下：(1)将干法制砂工艺生产出来的机制砂通过负压选粉机，吸附去除机制砂中多余的石粉，得机制砂尾料；(2)将机制砂尾料进行烘干，使其含水率小于1.0％；(3)进行机械粉磨至45μm细度低于30％；(4)加入硅灰，继续机械粉磨，混合均匀得改性机制砂尾料。制备的改性机制砂尾料石灰石粉活性好，将其作为矿物掺合料加入水泥混凝土中，替代部分粉煤灰，降低水泥用量，并且制备的混凝土流动性大、密实度高，且具有优异的耐久性。
Modification method and application of dry-process machine-made sand tailings
一种干法机制砂尾料的改性方法及用途
ZHANG GUOHUI (author) / WU CHONGXIAN (author) / HU CHANGYUAN (author) / TAN GUOJUN (author) / LU JINGHAI (author) / WANG SHIGEN (author)
2023-06-02
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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