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CaO-MgO-SiO2-H2O cementing material for mine filling and preparation method of CaO-MgO-SiO2-H2O cementing material

A technology of cao-mgo-sio2-h2o and cementitious materials, which is applied in the field of cementitious materials for mine filling, can solve the problem of restricting the application of tailings fine sand, failing to greatly increase the consumption of fine-grained tailings, and complex production processes problems such as high resource utilization rate, reduced filling cost and low preparation cost

Active Publication Date: 2022-05-10
WUHAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this technology improves the utilization of fine-grained tailings, it still requires a small amount of cement to provide early strength. That is to say, although this technology reduces the filling cost, the production process is complicated, and the consumption of fine-grained tailings cannot be greatly increased.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] CaO-MgO-SiO for mine filling 2 -H 2 O Gelling materials and methods for their preparation. The steps of the preparation method described in this embodiment are:

[0034] Step 1. Firstly mill the iron tailings fine powder and phosphorous tailings fine powder with a ball mill for 2-2.5 minutes respectively, then raise the temperature to 800-850°C at a rate of 0.5-2°C / min, and keep warm for 90-100min to obtain pretreatment respectively. Iron tailings fine powder and pretreated phosphorous tailings fine powder.

[0035] Mix 60-65wt% of the pretreated iron tailings fine powder and 35-40wt% of the pretreated phosphorous tailings fine powder to obtain the first mixture.

[0036] Step 2: Add 5-6.25wt% silicon micropowder, 1-2wt% sodium hydroxide and 100-125wt% water to the first mixture, and mix to obtain the second Second mixture, and then adjust the pH value of the second mixture to 11-11.5, and magnetically stir for 4-5.5 hours under the condition of 40-55° C. to obtain ...

Embodiment 2

[0042] CaO-MgO-SiO for mine filling 2 -H 2 O Gelling materials and methods for their preparation. The steps of the preparation method described in this embodiment are:

[0043] Step 1. Firstly mill the iron tailings fine powder and phosphorous tailings fine powder with a ball mill for 2-2.5 minutes respectively, then raise the temperature to 850-900°C at a rate of 2-3°C / min, keep it warm for 100-110min, and obtain pretreatment respectively Iron tailings fine powder and pretreated phosphorous tailings fine powder.

[0044] Mix 65-70wt% of the pretreated iron tailings fine powder and 30-35wt% of the pretreated phosphorous tailings fine powder to obtain the first mixture.

[0045] Step 2. Add 6.25-7.50wt% silicon micropowder, 2-3wt% sodium hydroxide and 125-150wt% water to the first mixture, and mix to obtain the first mixture. Second mixture, and then adjust the pH value of the second mixture to 11.5-12, and magnetically stir at 55-70° C. for 5.5-7 hours to obtain a slurry. ...

Embodiment 3

[0051] CaO-MgO-SiO for mine filling 2 -H 2 O Gelling materials and methods for their preparation. The steps of the preparation method described in this embodiment are:

[0052] Step 1. Firstly mill the iron tailings fine powder and phosphorous tailings fine powder with a ball mill for 2.5-3 minutes respectively, then raise the temperature to 900-950°C at a rate of 3-4°C / min, and keep it warm for 110-115min to obtain pretreated iron tailings respectively. Tailings fine powder and pretreatment phosphorous tailings fine powder.

[0053] Mix 70-75wt% of the pretreated iron tailings fine powder and 25-30wt% of the pretreated phosphorous tailings fine powder to obtain the first mixture.

[0054] Step 2: Add 7.50-8.75wt% silicon micropowder, 3-4wt% sodium hydroxide and 150-175wt% water to the first mixture, and mix to obtain the second mixture. Second mixture, and then adjust the pH value of the second mixture to 12-12.5, and magnetically stir at 70-85°C for 7-8.5 hours to obtain...

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Abstract

The invention relates to a CaO-MgO-SiO2-H2O cementing material for mine filling and a preparation method of the CaO-MgO-SiO2-H2O cementing material. According to the technical scheme, the preparation method comprises the following steps: mixing 60-80wt% of pretreated iron tailing micro-powder and 20-40wt% of pretreated phosphate tailing micro-powder to obtain a first mixture; adding silica powder accounting for 5-10 wt% of the first mixture, sodium hydroxide accounting for 1-5 wt% of the first mixture and water accounting for 100-200 wt% of the first mixture into the first mixture, and mixing to obtain a second mixture; adjusting the pH value of the second mixture to 11-13, and magnetically stirring to obtain slurry; carrying out solid-liquid separation on the slurry, freezing and drying the separated solid, carrying out heat preservation for 1-3 hours under the condition of 800-1000 DEG C, and carrying out furnace cooling and grinding, so as to obtain the CaO-MgO-SiO2-H2O cementing material for mine filling. The method has the characteristics of high recycling rate, low production cost and simple process, the strength of the prepared product conforms to the specification of Code for Design of Mining of Non-ferrous Metal (GB 50771-2012), and the filling slurry is low in bleeding rate and high in additional value.

Description

technical field [0001] The invention belongs to the technical field of cementitious materials for mine filling. Especially relates to a kind of CaO-MgO-SiO for mine filling 2 -H 2 O Gelling materials and methods for their preparation. Background technique [0002] Iron tailings are solid or powder wastes that cannot be used temporarily after iron ore beneficiation. They are the main component of industrial solid waste, and their chemical components are mainly oxides of iron, silicon, magnesium, calcium, and aluminum. ;Phosphate tailings are low-grade phosphate rock enriched by ore dressing 2 o 5 subsequent solid waste. At present, the stockpiles of iron tailings and phosphorous tailings are increasing year by year, which not only occupy a large amount of land, but also bring about serious environmental problems such as vegetation destruction, water pollution, and even the risk of dam collapse. Therefore, resource utilization of iron tailings and phosphorous tailings ha...

Claims

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Application Information

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IPC IPC(8): C04B12/00C04B12/02C04B28/00C04B28/34
CPCC04B12/005C04B12/02C04B28/006C04B28/34C04B2111/00017C04B2111/00724C04B2201/50C04B18/12Y02P40/10Y02W30/91
Inventor 叶义成贾晋彭胡南燕张光权王其虎姚囝罗斌玉柯丽华
Owner WUHAN UNIV OF SCI & TECH
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