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A composite cement curing agent used for filling with waste slag obtained after subjecting gold ore tailings to iron separation

A technology for gold mine tailings and curing agent, which is applied in solid waste management, sustainable waste treatment, climate sustainability, etc., can solve the problems of difficult tailings transportation, large amount of curing agent, and low strength of the cured body. , to achieve the effect of resource utilization, low production cost and small volume shrinkage

Inactive Publication Date: 2016-11-09
UNIV OF JINAN
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The advantage of this method is that it does not require high requirements for the tailings pond and does not require drainage facilities. The problem is that it is very difficult to transport the tailings under high-concentration conditions. In fact, the requirements for the venue are also very strict.
However, after using a large amount of finely ground industrial waste residue in the curing agent used in this method, the strength of the solidified body is low, and the compressive strength for 7 days is less than 0.2 MPa. The amount of curing agent used is large, and there is still a problem that dry stacking is difficult. Especially in the rainy season in the south, the unsolidified tailings will be muddy again into tailings slurry

Method used

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  • A composite cement curing agent used for filling with waste slag obtained after subjecting gold ore tailings to iron separation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 1. The mass fraction of the three composite curing agents is 15%, and the ratio of the composite curing agents is as follows: Ordinary Portland cement (P.O 52.5): 70%; Slaked lime: 20%; High alumina cement (CA600): 10 %. The dry mass fraction of gold slag is 85%, and the water-cement ratio in this experiment is 0.535;

[0028] 2. According to the above ratio, mix 85g of gold tailings gold slag and 15g of composite curing agent together with a mixer, then add a fixed quality of water into the mixture, stir with a cement slurry mixer for 4 minutes, and then mix Pour the processed mixture into a mold for molding, and finally put the molded sample into the air for curing for 1 day to obtain the solidified gold slag product;

[0029]3. After the gold slag is solidified, the unconfined compressive strength reaches 1.01MPa at 1d, 3.24MPa at 3d, 4.63MPa at 7d, and 4.63MPa at 28d. It is 4.87MPa, and the mechanical properties of the cured product basically tend to be stable.

Embodiment 2

[0031] 1. The mass fraction of the three composite curing agents is 15%, and the ratio of the composite curing agents is as follows: Ordinary Portland cement (P.O 52.5): 10%, Slaked lime: 20%, High alumina cement (CA600): 70 %, the mass fraction of gold slag dry basis is 85%, and the water-cement ratio in this experiment is 0.535;

[0032] 2. According to the above ratio, mix 85g of gold tailings and gold slag and 15g of composite curing agent together with a mixer, then add a fixed quality of water into the mixture, stir with a cement slurry mixer for 4 minutes, and then mix The stirred mixture is poured into a mold for molding, and finally the molded sample is placed in the air for 1 day of curing to obtain the cured product;

[0033] 3. After the gold slag is solidified, the unconfined compressive strength reaches 1.24MPa at 1d, 1.66MPa at 3d, 2.09MPa at 7d, and 28d at 28d It is 1.75MPa, and the strength of 28d solidified gold slag produces slight shrinkage.

Embodiment 3

[0035] 1. The mass fraction of the three composite curing agents is 15%, and the ratio of the composite curing agents is as follows: Ordinary Portland cement (P.O 52.5): 75%; Dihydrate gypsum: 10%; High alumina cement (CA600) : 15%. The dry mass fraction of gold slag is 85%, and the water-cement ratio in this experiment is 0.535;

[0036] 2. According to the above ratio, mix 85g of gold tailings gold slag and 15g of composite curing agent together with a mixer, then add a fixed quality of water into the mixture, stir with a cement slurry mixer for 4 minutes, and then mix The processed mixture is poured into a mold for molding, and finally the molded sample is placed in the air for 1 day of curing to obtain the cured product;

[0037] 3. After the gold slag is solidified, the unconfined compressive strength reaches 1.18MPa at 1d, 2.78MPa at 3d, 3.89MPa at 7d, and 3.89MPa at 28d. It is 2.90MPa. At the same time, the mechanical properties of the cured product tend to be stable,...

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Abstract

The invention relates to the field of tailing resource comprehensive utilization and waste innocent treatment, and provides a composite cement curing agent used for rapidly curing waste slag (gold slag for short) obtained after subjecting gold ore tailings to iron separation. A cured gold slag product is prepared by fully mixing 85 wt% of gold tailing gold slag and 15 wt% of the composite cement curing agent (comprising an alkaline activator, a sulfate activator, and the like) according to a certain ratio through a material mixer, adding water having a certain mass, fully stirring, adding the mixture after fully stirring into a mold, molding, and curing a molded sample in air for 1 d. The unconfined compression strength when a curing period is 1 d of the cured gold slag prepared by using the curing agent is 1.0 MPa or above, unconfined compression strength when a curing period is 3 d of the cured gold slag is 2.0 MPa or above, and unconfined compression strength when a curing period is 7 d of the cured gold slag is 2.5 MPa or above. The curing agent is simple in formula, low in using amount, good in catalytic effects, and rapid in curing, and the early strength of a cured product is high. Unification of tailing treatment and comprehensive utilization is achieved.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of tailings resources and harmless treatment of wastes, and in particular relates to a method of rapidly solidifying gold ore tailings waste slag after iron selection by using a cement composite curing agent. Background technique [0002] In recent years, due to the rapid development of the gold industry, the processing capacity of mine concentrators has increased, and the corresponding discharge of tailings has also increased. According to incomplete statistics, the number of existing tailings ponds (dams) in gold mines has reached 368. In 2005, my country's tailings production was 733 million tons, and its utilization rate was only about 7%; in 2010, it reached 1.23 billion tons, and its utilization rate was only 14%; the comprehensive utilization rate of industrial waste in my country was about 60%, which is relatively low. In contrast, the comprehensive utilization rate of tailings lags...

Claims

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Application Information

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IPC IPC(8): C04B28/12C04B28/14C04B18/14
CPCC04B18/144C04B28/12C04B28/141C04B2111/00724C04B7/02C04B7/32Y02W30/91
Inventor 陈延昌王琦宋鹏王利新罗志宏
Owner UNIV OF JINAN
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