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Preparation method of mixed grinding of steel slag-slag-gypsum composite cementitious material

A technology of composite cementitious material and mixed powder, which is applied in cement production and other directions, can solve the problems such as not involving the comprehensive treatment of cementitious materials, and the comprehensive utilization rate of steel slag is less than 40%, so as to achieve comprehensive utilization value, fineness and specific surface area. Stable and simple process effect

Active Publication Date: 2021-11-12
SHEXIAN QINGZHANG CEMENT MFG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, as one of the worst bulk solid wastes used by iron and steel enterprises, the comprehensive utilization rate of steel slag is less than 40%.
However, this process is still a separate treatment process for steel slag, and does not involve comprehensive treatment of cementitious materials

Method used

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  • Preparation method of mixed grinding of steel slag-slag-gypsum composite cementitious material
  • Preparation method of mixed grinding of steel slag-slag-gypsum composite cementitious material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment provides a method for mixing and grinding steel slag-slag-gypsum composite cementitious material, comprising the following steps:

[0038] (1) Preparation of steel slag particles

[0039]Primary crushing and pre-removal of steel slag raw materials: The raw material of converter steel slag is fed, and pre-removed by hanging iron remover. The steel slag after pre-removed iron enters the roller press for primary crushing, and then enters the vibrating screen for screening. After sieving, coarse particles I and fine particles I are produced. The particle size of coarse particles I is 15mm, and the particle size of fine particles I is 10mm. Fine particles I form steel slag sand and steel slag grains after powder selection by powder classifier, the granularity of steel slag sand is 5mm, and the granularity of steel slag grains is 2.7mm.

[0040] (2) Pretreatment of slag

[0041] The blast furnace water-quenched slag raw material is fed, and iron is removed i...

Embodiment 2

[0046] This embodiment provides a method for mixing and grinding steel slag-slag-gypsum composite cementitious material, comprising the following steps:

[0047] (1) Preparation of steel slag particles

[0048] Primary crushing and pre-removal of steel slag raw materials: Feed the raw material of steel slag from electric furnace, and pre-remove iron with a hanging iron remover. After sieving, coarse particles I and fine particles I are produced, the particle size of coarse particles I is 10mm, and the particle size of fine particles I is 5mm; coarse particles I return to the roller press after iron removal by the drum type iron remover to continue crushing, forming a closed loop Fine particles I form steel slag sand and steel slag grains after powder selection by powder classifier, the granularity of steel slag sand is 3mm, and the granularity of steel slag grains is 2mm.

[0049] (2) Pretreatment of slag

[0050] The blast furnace water-quenched slag raw material is fed, an...

experiment example

[0057] (1) Comparing the gelled material prepared by Comparative Example 2 and Comparative Example 1, the 28d activity of the gelled material of Comparative Example 1 can only reach 93% of that of Example 2, and the activity is low; the grinding process of Comparative Example 1 The energy consumption is 10% higher than that of Example 2, but the production capacity is only 85% of that of Example 2.

[0058] (2) The cementitious materials prepared in Example 1-2 and Comparative Example 1 are respectively prepared into mortar test pieces according to the water-to-binder ratio of 0.32, and the amount of water reducer is based on the fluidity of the mortar at 180-220mm. The material stability test is carried out according to GB / T 1346-2011 "Cement Standard Consistency Water Consumption, Setting Time, and Stability Test Method". The stability test adopts two methods of test cake method and Rayleigh method, and the stability is in line with the national standard. The parameter comp...

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Abstract

The invention relates to a preparation method for mixing and grinding steel slag-slag-gypsum composite cementitious material, comprising: taking steel slag particles, slag and gypsum, mixing the above raw materials, and grinding them through a grinding device to obtain fine particles II , Coarse particle II and coarse particle III, the fine particle II enters the dust collector after hot air selection, and the coarse particle II falls back to the milling disc of the grinding device to continue grinding; the coarse particle III is removed by the iron remover Continue to grind through the grinding device, thus forming a cycle until all the raw materials enter the dust collector, that is, the gelled material is prepared. The material prepared by the mixed grinding method has good gradation, high activity and strength; further, through the pretreatment of steel slag particles and the recovery and reuse of hot and humid tail gas, the whole process has achieved no waste, high efficiency, low energy consumption, No pollution.

Description

technical field [0001] The invention relates to the field of resource utilization of industrial solid waste and the technical field of building materials, in particular to a preparation method for mixing and grinding steel slag-slag-gypsum composite cementitious material. Background technique [0002] The cementitious material prepared from steel slag, slag, gypsum and other solid wastes can be directly used as cement in many cases. If this kind of steel slag-slag-gypsum composite cementitious material can be widely used, it is estimated that the consumption of cement clinker can be reduced by more than 90% in the Beijing-Tianjin-Hebei region in the next 20 years. [0003] According to statistics, in 2018, my country's crude steel output was 928.26 million tons, and every ton of crude steel produced produced about 0.15 tons of steel slag. According to calculations, in 2018 alone, my country produced 139.239 million tons of steel slag. However, the comprehensive utilization ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/21C04B7/38
CPCC04B7/21C04B7/38Y02P40/10
Inventor 温国平巴浩静杨兑亨倪文赵智利杨志江
Owner SHEXIAN QINGZHANG CEMENT MFG CO LTD
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