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Preparation method of dry-process fine tailings machine-made sand and high-strength concrete containing the machine-made sand

A technology for machine-made sand and tailings, applied in the field of high-strength concrete, can solve the problems of poor particle shape, uneven fragmentation, and poor performance of machine-made sand, and achieve the effects of improving compressive strength, improving adaptability, and improving strength.

Active Publication Date: 2022-07-19
普宁市吉润混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Limestone resources are abundant and the mining cost is low. Limestone tailings are often used to prepare machine-made sand, but the structure of limestone tailings is loose, and the fragmentation is uneven during the crushing and impact process, which makes the grain shape of the finished machine-made sand product poor. Too much stone powder, which in turn makes the performance of the machine-made sand poor, which affects the combination of the machine-made sand with the rubber when it is added to concrete or mortar and its supporting role as aggregate.
In view of this technical problem, the inventor believes that there is still a lot of room for improvement in the existing method for preparing limestone tailings machine-made sand

Method used

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  • Preparation method of dry-process fine tailings machine-made sand and high-strength concrete containing the machine-made sand
  • Preparation method of dry-process fine tailings machine-made sand and high-strength concrete containing the machine-made sand
  • Preparation method of dry-process fine tailings machine-made sand and high-strength concrete containing the machine-made sand

Examples

Experimental program
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Effect test

Embodiment 1

[0045] The present embodiment discloses a method for preparing dry-process fine tailings manufactured sand, which specifically includes the following steps:

[0046] Step 1, limestone tailings pretreatment:

[0047] Step 1-1, collect the limestone tailings of 500kg, add the polyacrylic acid solution of 80kg in the limestone tailings and mix, add the vinylsulfonic acid of 20kg, 15kg polyacrylamine hydrochloride and 30kg of calcium chloride aqueous solution was stirred for 2 hours at a temperature of 30°C and a rotational speed of 60r / min, then kept for 24 hours, washed with deionized water, and dried at a constant temperature of 80°C with a vacuum dryer for 1 hour. Modified limestone tailings;

[0048] Step 1-2, mix 15kg pueraria starch and 13kg xanthan gum into a water bath pot, gelatinize in a water bath at 90°C, stop heating after gelatinization to a viscous state, pour into a stirring tank, add 7kg N,N-sub Methylbisacrylamide and 7kg of sodium persulfate were stirred at a...

Embodiment 2

[0057] A kind of preparation method of fine-quality tailings machine-made sand by dry process, the difference from Embodiment 1 is: the content of each component and the technological parameter are different in the treatment process, and the details are as follows:

[0058] In step 1-1, the limestone tailings of 520kg are collected, the polyacrylic acid solution of 100kg is added in the limestone tailings and mixed, the vinylsulfonic acid of 30kg, the polyacrylamine hydrochloride of 20kg and the calcium chloride aqueous solution of 35kg are added in the process of stirring. , and stirred for 1 h at a temperature of 35 °C;

[0059] Step 1-2, mix 17kg pueraria starch and 16kg xanthan gum into a water bath, gelatinize in a water bath at 110°C, add 9.5kg N,N-methylenebisacrylamide and 9.5kg sodium persulfate after cooling, stir 3h;

[0060] Step 7, soak the crude machine-made sand in a mixed solution of 22kg methyl acetate, 16kg tartaric acid and 30kg ethanol.

Embodiment 3

[0062] A method for preparing dry-process fine-quality tailings manufactured sand is different from Example 2 in that step 7 also includes a post-treatment process for dry-process fine-quality tailings manufactured sand, which specifically includes the following steps: Add 30kg of toluene, 7kg of vinyltrimethoxysilane, 10kg of polyaspartic acid, and 12kg of L-3,4-dihydroxyphenylalanine to the mixture, react at 100°C for 10h, and make solid-liquid separation after standing for precipitation. , the upper layer liquid was discharged, and the obtained manufactured sand solid product was ultrasonically cleaned with deionized water at a 37kHz ultrasonic frequency, and was dried by a vacuum dryer at a constant temperature of 60°C for 1 hour to obtain post-treated dry-process fine tailings manufactured sand.

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Abstract

The present application relates to a method for preparing dry-process fine tailings manufactured sand and a high-strength concrete containing the manufactured sand. The processing method includes the following specific steps: Step 1, pretreatment of limestone tailings; Step 2, crushing the pretreated limestone tailings to make sand, to obtain fine sand with an average particle size of 0.25-0.05mm; step 3, vibrating the fine sand; step 4, reclaiming and filtering the fine sand after screening; step 5, reclaiming and filtering the remaining fine sand The fine sand is subjected to primary dedusting treatment and secondary dedusting treatment to obtain coarse machine-made sand; step 6, collecting the stone powder obtained by dedusting; unloading the coarse machine-made sand; step 7, soaking the coarse machine-made sand in methyl acetate, tartaric acid In the mixed solution of ethanol and ethanol, stir evenly, stand for 6 hours, and then dry to obtain dry-process fine tailings machine-made sand. The present application has the effect of improving the quality of the finished product of limestone tailings manufactured sand.

Description

technical field [0001] The present application relates to the technical field of machine-made sand treatment, and in particular, to a method for preparing dry-process fine-quality tailings machine-made sand and a high-strength concrete containing the machine-made sand. Background technique [0002] Tailings are solid wastes discharged after crushing ores and selecting "useful components" by concentrators under specific technical conditions. It is the bulk solid waste with the largest output and the lowest comprehensive utilization rate in my country. Comprehensive utilization of tailings has gradually become one of the issues that are highly valued in our country and even in the world. [0003] Since natural sand is a non-renewable local resource, natural sand resources have been greatly reduced and are close to depletion. The contradiction between supply and demand of concrete sand is particularly prominent. The proportion of total consumption is also increasing year by yea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B20/02C04B18/12C04B20/10C04B28/04
CPCY02W30/91
Inventor 陈燕花陈敬邦巫宋杰陈树汉
Owner 普宁市吉润混凝土有限公司