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Paste filling cementing material for tailings containing Zn and PAM as well as preparation method and application of paste filling cementing material

A paste filling and cementitious material technology, which is applied in the direction of filling, mining equipment, earth square drilling, etc., can solve the problems of reducing the formation of cement hydration products, which is not conducive to the development of early strength, and affects the development of early strength. Achieve high economic and environmental benefits, solve the effect of low early strength, and save filling costs

Pending Publication Date: 2022-05-27
YUNNAN CHIHONG ZINC & GERMANIUM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The amine group contained in PAM will interact with Ca in the hydration system of cement-based cementitious materials. 2+ Produce adsorption and reduce Ca in the system 2+ Concentration delays the hydration rate of cement, thereby reducing the formation of cement hydration products, which is not conducive to the development of early strength, and cannot meet the actual filling requirements of mines.
[0003] In addition to the influence of PAM on the early strength, for the paste filling project of zinc (Zn) non-ferrous polymetallic ore (especially lead-zinc ore), it is also common that the tailings produced after smelting still contain varying amounts of zinc, so that the setting time is too long and the early strength is low when cementing and filling zinc-containing tailings with cement
This is because during the hydration process of cement-based cementitious materials, the introduction of Zn will interact with the Ca produced by cement hydration. 2+ and OH - A reaction occurs to form a layer of insoluble compound CaZn(OH) on the surface of unhydrated cement particles 6 2H 2 O covering film, which hinders cement minerals (tricalcium silicate, C 3 S) The contact with water and the dissolution of gypsum delay the hydration process of cement, making Ca in the system 2+ and OH - Insufficient concentration to maintain hydration product formation at normal rate, thereby affecting early strength development

Method used

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  • Paste filling cementing material for tailings containing Zn and PAM as well as preparation method and application of paste filling cementing material
  • Paste filling cementing material for tailings containing Zn and PAM as well as preparation method and application of paste filling cementing material

Examples

Experimental program
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Effect test

Embodiment 1

[0032] (1) Thoroughly dry the lead-zinc slag, and weigh 4.0kg of lead-zinc slag, 4.5kg of aluminate clinker, 0.7kg of industrial anhydrous aluminum sulfate and 0.8kg of slaked lime in proportion; put the lead-zinc slag into the mill The machine is firstly ground for 110 minutes, then put into aluminate clinker and then ground for 55 minutes, and finally put in industrial anhydrous aluminum sulfate and slaked lime for mixed grinding for 3 minutes; the specific surface area is not less than 400m after sieving. 2 The powder per kg is the paste filling cementitious material for tailings containing zinc and PAM.

[0033] (2) Weigh 1.6kg of the paste filling gelling material prepared above, mix it with 9.2kg of tailings containing Zn and PAM with a concentration of 87%, and add 2.0kg of water and stir to form a paste with a concentration of 75%. Filling slurry for molding; according to the curing conditions specified in the standard T / CECS 10091-2020 (temperature maintained at 20 °C...

Embodiment 2

[0035] (1) The lead-zinc slag is thoroughly dried, and 5.0kg of lead-zinc slag, 3.8kg of aluminate clinker, 0.5kg of industrial anhydrous aluminum sulfate and 0.7kg of quicklime are respectively weighed in proportion; the lead-zinc slag is put into the mill. The machine is firstly ground for 120 minutes, then put into aluminate clinker and then ground for 60 minutes, and finally put into industrial anhydrous aluminum sulfate and quicklime for mixed grinding for 5 minutes; the specific surface area after screening is not less than 400m 2 The powder per kg is the paste filling cementitious material for tailings containing Zn and PAM.

[0036] (2) Weigh 1.6kg of the paste filling gelling material prepared above, mix it with 11.0kg of tailings containing Zn and PAM with a concentration of 87%, and add 2.3kg of water and stir to form a paste with a concentration of 75%. Filling slurry for molding; according to the curing conditions specified in the standard T / CECS 10091-2020 (tempe...

Embodiment 3

[0038] (1) Thoroughly dry the lead-zinc slag, and respectively weigh 4.7kg of lead-zinc slag, 4.5kg of aluminate clinker, 0.3kg of industrial anhydrous aluminum sulfate and 0.5kg of slaked lime in proportion; put the lead-zinc slag into the mill. The machine is firstly ground for 115 minutes, then put into aluminate clinker and then ground for 60 minutes, and finally put in industrial anhydrous aluminum sulfate and slaked lime for mixed grinding for 4 minutes; the specific surface area is not less than 400m after sieving 2 The powder per kg is the paste filling cementitious material for tailings containing Zn and PAM.

[0039] (2) Weigh 1.6kg of the paste filling gelling material prepared above, mix it with 12.9kg of tailings containing Zn and PAM with a concentration of 87%, and add 2.6kg of water and stir to form a paste with a concentration of 75%. Filling slurry for molding; according to the curing conditions specified in the standard T / CECS 10091-2020 (temperature maintai...

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Abstract

According to the paste filling cementing material for the tailings containing Zn and PAM and the preparation method and application of the paste filling cementing material, the delay effect of Zn and PAM in the tailings on hydration of a cement-based cementing material is reduced, normal hydration and condensation of the cementing material are guaranteed, then the early hardening strength of paste filling slurry is improved, and the service life of the paste filling slurry is prolonged. And the use amount of a cementing material for achieving the same filling and hardening effect is reduced in a disguised manner.

Description

technical field [0001] The application type of the present invention relates to the technical field of mining, in particular to a paste filling cementitious material for tailings containing Zn and PAM, and a preparation method and application thereof. Background technique [0002] Paste filling technology is essentially a mine filling technology that increases the concentration of tailings underflow through dense treatment technology, thereby increasing the concentration of filling slurry. Due to the outstanding advantages of paste filling in reducing filling cost, improving downhole environment, and enhancing the strength of filling body, paste filling has gradually become the mainstream of cement filling technology development. However, because the paste filling requires a high concentration of the filling slurry, usually not less than 75%, this requires the tailings to have a high underflow concentration; and in order to avoid the segregation and bleeding of the filling s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/06C04B18/14C04B18/12E21F15/00C04B111/70C04B111/20
CPCC04B28/06C04B18/141C04B18/12E21F15/005C04B2111/00724C04B2111/70C04B2111/00017C04B2201/50C04B2111/20C04B22/148C04B22/064Y02W30/91
Inventor 李旺潘张伟王刚石宏伟钟超胡义南张祝九黄吉荣李文光李劼
Owner YUNNAN CHIHONG ZINC & GERMANIUM
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