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A low-silicon iron tailings non-steaming block with excellent water resistance and its preparation method

A technology for iron tailings and ferrosilicon, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc. The effect of cement

Active Publication Date: 2017-05-24
武钢资源集团有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disposal of tailings not only occupies a large amount of land, but also endangers the environment and safety. The main manifestations are: (1) tailings have small particle size, high bulk density, easy to flow and collapse during stacking, and damage vegetation; (2) tailings dust Driven to fly around, causing soil pollution, land degradation and increased dust content in the air; (3) tailings components and residual beneficiation agents have intensified damage to the ecological environment, polluting crops, surface water and groundwater sources
(4) There are potential safety hazards in the storage of tailings, and it takes up a lot of land resources
[0009] Underground mining causes surface subsidence, mineral processing produces a large amount of tailings, and disposal costs are high

Method used

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  • A low-silicon iron tailings non-steaming block with excellent water resistance and its preparation method
  • A low-silicon iron tailings non-steaming block with excellent water resistance and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] A low-silicon iron tailings solidified block for non-steam filling with excellent water resistance, its raw material composition and weight percentage content are: 85.2% of its iron tailings fine powder, 14.8% of its curing agent; its iron tailings powder medium particle size The content of ≤88μm is 80%; stearic acid emulsion and triethanolamine are added, wherein the stearic acid emulsion is added according to 5.8% of the total weight percentage of the added curing agent, and the triethanolamine is added according to 0.035% of the total weight percentage of the added curing agent;

[0033] Preparation steps:

[0034] 1) Concentrate the low-silicon iron tailings slurry that has been crushed and ground to a set particle size, and control the concentration of the low-silicon iron tailings weight percentage in the low-silicon iron tailings slurry to 85%; The content of particle size ≤ 88μm in ferrosilicon tailings powder is 80%;

[0035] 2) Mix the above-mentioned concent...

Embodiment 2

[0042] A low-silicon iron tailings non-steaming solidified block with excellent water resistance, its raw material composition and weight percentage content are: its iron tailings fine powder is 87.6%, the curing agent is 12.4%; its iron tailings powder medium particle size The content of ≤88μm is 75.5%; stearic acid emulsion and triethanolamine are added, wherein the stearic acid emulsion is added according to 10% of the total weight percentage of the added curing agent, and the triethanolamine is added according to 0.04% of the total weight percentage of the added curing agent;

[0043] Preparation steps:

[0044] 1) Concentrate the low-silicon iron tailings slurry that has been crushed and ground to a set particle size, and control the concentration of the low-silicon iron tailings weight percentage in the low-silicon iron tailings slurry to 85%; The content of ferrosilicon tailings powder with particle size ≤ 88μm is 75.5%;

[0045] 2) Mix the above-mentioned concentrated...

Embodiment 3

[0052] A solidified block for low-silicon iron tailings non-steam filling with excellent water resistance. The content of ≤88μm is 72%; stearic acid emulsion and triethanolamine are added, wherein the stearic acid emulsion is added according to 15% of the total weight percentage of the added curing agent, and the triethanolamine is added according to 0.03% of the total weight percentage of the added curing agent;

[0053] Preparation steps:

[0054] 1) Concentrate the low-silicon iron tailings slurry that has been crushed and ground to a set particle size, and control the concentration of the low-silicon iron tailings weight percentage in the low-silicon iron tailings slurry to 87%; The content of ferrosilicon tailings powder with particle size ≤ 88μm is 72%;

[0055] 2) Mix the above-mentioned concentrated low-silicon iron tailings slurry with the curing agent according to the content, and spray stearic acid emulsion or sodium stearate emulsion and triethanolamine while mixi...

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Abstract

A low-silica iron ore tailing non-autoclave block with good hydrolytic resistance comprises the following raw materials by weight percent: for making building material bricks, 70-75% of iron ore tailing fine powder and 25-30% of a curing agent; for making solidified blocks for filling, 85-90% of iron ore tailing fine powder and 10-15% of a curing agent, wherein the content of iron ore tailing fine powder with the particle size being 88 micron or below in the whole iron ore tailing fine powder is not lower than 70%; stearic acid solution or sodium stearate solution and triethanolamine. The preparation method comprises the following steps: concentrating low-silica iron ore tailing pulp; mixing the concentrated low-silica iron ore tailing pulp with the curing agent according to the contents, and spraying stearic acid solution or sodium stearate solution and triethanolamine at the same time; ageing; carrying out roll grinding; pressurizing for formation; maintaining for use. According to the preparation method, not only roasting and autoclaved curing are avoided, but also cement is not used, so that environmental pollution is avoided; as for the building material bricks, the compressive strength is not lower than 28 MPa, and the softening coefficient is not lower than 0.85; as for the solidified blocks for filling, the compressive strength and the compressive strength in a water absorption saturation condition are not lower than 9.5 MPa and 6.5 MPa respectively.

Description

technical field [0001] The invention relates to a building or mine filling material and a preparation method, specifically to a low-silicon iron tailings non-steaming block and its preparation method, specifically to a low-silicon iron tailings non-steaming block with excellent water resistance and its preparation method. Background technique [0002] Iron tailings are the solid waste left after iron ore has been selected for iron concentrate. With the rapid development of my country's iron and steel industry, the amount of iron ore mining continues to increase, and more and more tailings are discharged from iron ore factories. According to relevant data, nearly 300 million tons of tailings are discharged every year from iron ore dressing plants across the country. The comprehensive utilization rate is less than 20%. The discharge and disposal of iron tailings has always been a bottleneck factor hindering the development of my country's mining industry. The disposal of tai...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/14C04B24/16C04B24/08C04B18/14
CPCY02W30/91
Inventor 宋均平雷国元毛少波
Owner 武钢资源集团有限公司