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Tailing-based cementing material and preparation method thereof

A technology of tailings and rubber base, which is applied in cement production and other directions, and can solve the problem of low utilization of tailings

Active Publication Date: 2020-10-30
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, iron ore blast furnace water quenching slag, fly ash, cement clinker, lime, and gypsum are mainly used, and the utilization degree of tailings is relatively low.

Method used

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  • Tailing-based cementing material and preparation method thereof
  • Tailing-based cementing material and preparation method thereof
  • Tailing-based cementing material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A method for preparing a tailings-based environmental functional material, the specific implementation steps are as follows:

[0036]1) Take 10kg of lead-zinc tailings (the total mass of quartz and dolomite accounts for about 70%, and the original D of lead-zinc tailings 50 At about 150 μm, with a moisture content of about 20%), put it into a blast drying oven at 105°C and dry it to constant weight, then use a ball mill (rotating speed: 300r / s) to grind the dried lead-zinc tailings for 120min and save it for later use;

[0037] 2) Add rice husk ash accounting for 0% to the lead-zinc tailings obtained in step 1), mix well and set aside;

[0038] 3) The product obtained in step 2) is placed in a heating device and heated at 500°C for 40 minutes, and then cooled naturally for later use;

[0039] 4) Add sodium sulfate accounting for 10% to the product obtained in step 3), mix well and set aside;

[0040] 5) The product obtained in step 4) was subjected to a clean pulp for...

Embodiment 2

[0049] A preparation method of tailings-based cementitious material, the specific implementation steps are as follows:

[0050] 1) Take 10kg of lead-zinc tailings (the total mass of quartz and dolomite accounts for about 70%, and the original D of lead-zinc tailings 50 At about 150 μm, moisture content at about 20%), put it into a blast drying oven at 105°C and dry it to constant weight, then use a ball mill (ball milling speed is 200r / s) to grind the dried lead-zinc tailings for 20 minutes and save it for later use;

[0051] 2) Add rice husk ash accounting for 30% to the lead-zinc tailings obtained in step 1), mix well and set aside;

[0052] 3) The product obtained in step 2) is placed in a heating device and heated at 400°C for 30 minutes, and then cooled naturally for later use;

[0053] 4) Add cement clinker accounting for 8% to the product obtained in step 3), mix well and set aside;

[0054] 5) The product obtained in step 4) was subjected to a clean pulp forming expe...

Embodiment 3

[0057] 1) The consolidated body consolidated for 28 days in the implementation case 1 is broken, and sealed with absolute alcohol for 2 days;

[0058] 2) Dry the solid in step 1) at 70°C, grind through a 5mm square hole sieve for later use;

[0059] 3) The solid in step 2) is tested for leaching toxicity using the standard HJ / T 300-2007;

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Abstract

The invention discloses a tailing-based cementing material and a preparation method thereof. The method comprises the following steps: drying a tailing raw material, and sequentially carrying out mechanical ball-milling activation treatment, thermal activation treatment and chemical agent activation treatment to obtain the tailing-based cementing material. According to the method, tailings are activated through a mechanical activation, thermal activation and chemical activation combined excitation method, the potential volcanic ash activity is utilized, the cementing material with better cementing performance is obtained, the maximum compressive strength of the solidified gel material can reach 10 MPa, the solidified gel material completely meets the underground filling technology, the solidified leachate meets the surface water quality IV type water standard, the method is simple in tailing treatment process, safe and free of pollution, and a brand-new thought can be provided for comprehensive utilization and resourceful treatment of tailings.

Description

technical field [0001] The invention relates to a method for utilizing tailings, in particular to a method for utilizing tailings to prepare cementitious materials to realize resource utilization of tailings, and belongs to the technical field of solid waste resource utilization. Background technique [0002] Tailings refers to a kind of industrial solid waste discharged after crushing and flotation of raw ores. The discharge volume is huge, and special tailings ponds need to be built for stacking. The particle size of tailings is small, and long-term stacking will cause heavy metals and other potentially harmful substances. The water-soluble compounds seep into the environmental water and form floating dust with the wind, which can easily pollute the surrounding ecological environment. Under a series of chemical actions, some sulfur-containing tailings are easy to form acidic wastewater, which endangers the growth of animals, plants and crops, and ultimately endangers human...

Claims

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Application Information

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IPC IPC(8): C04B7/24C04B7/28C04B7/36
CPCC04B7/24C04B7/28C04B7/36Y02P40/10
Inventor 侯浩波王豪杰周旻李逸馨郑凡李嘉豪薛金凤
Owner WUHAN UNIV
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