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A grinding process for improving particle gradation of stone waste cement mixture and prepared stone waste cement

A technology of stone waste and mixed material, applied in the field of stone waste cement, can solve the problems affecting the performance of cement and concrete, increase the production cost, over-grinding of stone powder, etc. The effect of cost control

Inactive Publication Date: 2018-03-20
HUBEI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the grinding is not continued, the particle size of the stone powder will not meet the quality standard. If the grinding is continued, it will easily cause over-grinding of the stone powder, resulting in energy waste and increased production costs, and will also affect the performance of cement and concrete.

Method used

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  • A grinding process for improving particle gradation of stone waste cement mixture and prepared stone waste cement
  • A grinding process for improving particle gradation of stone waste cement mixture and prepared stone waste cement
  • A grinding process for improving particle gradation of stone waste cement mixture and prepared stone waste cement

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1～3

[0023] A grinding process for improving particle gradation of stone waste cement admixture, comprising the following steps:

[0024] 1) Preliminary sorting of stone waste, passing through a 4.75mm sieve; removing impurities from the upper part of the sieve, and then placing it in a hammer crusher for secondary crushing. The particle size range of crushed stone is 4.75-9.5mm; 2) Take the stone powder obtained under the 4.75mm sieve and put it in the dryer for drying treatment. 0.5; 3) Place the dried stone powder and grinding aid medium in a ball mill for grinding treatment, the grinding aid medium accounts for 10-35% of the weight of the grinding powder (drying obtained powder), and the ball milling time is controlled at 25min; 4) Put the milled powder in a dryer for drying treatment, control its moisture content to ≤1.0%, and then carry out wind separation, collect ≤0.60mm powder and store it in a warehouse to obtain stone waste cement mixture material, powder Material speci...

Embodiment 4～6

[0034] stone waste cement

[0035]The stone waste cement mixture prepared in Examples 1-3 is used to prepare stone waste cement, and the stone waste cement is prepared by mixing and grinding the stone waste cement mixture, desulfurized gypsum and cement clinker. Among them: the mass ratios of stone waste cement admixture, desulfurized gypsum, and cement clinker are: 12:1.7:100, 12:1.9:100, 14:2.0:100, respectively. Grind and place in the warehouse according to the conventional cement grinding process, and then carry out the mortar strength test to measure the cement setting time, flexural and compressive strength, fineness and specific surface area and other performance parameters and components. The results are shown in Table 3 and Table 3 respectively. 4.

[0036] Table 3 Test results of cement performance

[0037]

[0038] Wherein, the ordinary portland cement adopted in Comparative Example 2 is Huaxin P·O 42.5 cement, and its parameters are the data provided by the pr...

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Abstract

The invention discloses a powder grinding method used for improving stone waste material cement admixture grain composition, and stone waste material cement prepared via the powder grinding method. According to the powder grinding method, ball mill rotating speed and steel ball cooperation are reasonably designed in powder processing process of stone powder obtained from stone waste material, a grinding aid medium obtained via crushing of broken stone is added, and water content is controlled strictly, so that agglomeration and ball pasting of stone powder in powder grinding process are avoided effectively, stone powder grain composition is improved, and performance requirements of stone powder as a cement admixture or mineral admixture in cement concrete are satisfied; the stone powder can be used for reducing cement production cost effectively as a cement admixture, and increasing cement paste fluidity and denseness; and stone waste material cement is capable of improving flexural and compressive strength of concrete, and improving later phase durability of concrete. Technical process of the powder grinding method is simple; cost is low; and the powder grinding method is capable of saving energy, is friendly to the environment, and is suitable for popularization and application.

Description

technical field [0001] The invention belongs to the field of solid waste comprehensive utilization, and in particular relates to a grinding process for improving particle gradation of stone waste cement mixture materials and prepared stone waste cement. Background technique [0002] With the increasingly severe energy situation and increasing industrial solid waste, environmental protection and ecological sustainable development have become urgent problems to be solved. Stone powder is the powder produced by stone factories in stone sawing, cutting, grinding and other processing processes. The particle size distribution of the powder is uneven, and the recycling rate is extremely low. Most of them are piled up without treatment. Pollution is generated, a large amount of resources are wasted, and the sustainable economic development of the cycle is restricted. The chemical composition of stone powder is similar to industrial fly ash, with silica and alumina accounting for 80...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B18/12C04B28/00
CPCY02W30/91
Inventor 黄修林卞周宏黄绍龙彭波金帆
Owner HUBEI UNIV