Curing and dry-piling method of iron tailings

A technology of iron tailings and dry stacking, which is applied in the field of mine safety, can solve problems such as safe storage of iron tailings, achieve low power consumption, reduce costs, and save natural resources

Inactive Publication Date: 2012-07-04
KUNMING UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the present invention is to provide a production method specially for solidified dry stacking of iron tailings to solve the problem of iron tailings safe stockpiling

Method used

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  • Curing and dry-piling method of iron tailings
  • Curing and dry-piling method of iron tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: as figure 1 Shown, the specific steps of this iron tailing solidification dry pile method are as follows

[0026] (1) Preparation of curing agent: firstly dry, sieve and crush steel slag 53 wt%, phosphogypsum 4wt%, clinker 25wt%, quicklime 7wt%, fly ash 10wt% and additive 1.0wt% respectively into sizes smaller than 10mm particles, then mixed according to the formula, natural aging for 6 hours, then ground, the powder fineness is controlled to 0.08mm sieve and the sieve is less than 8%, and the curing agent is obtained; the additives are sodium sulfate 20wt%, sodium chloride 40wt% , calcium chloride 5wt%, ferric chloride 15wt%, polyaluminum sulfate 5wt%, polyferric sulfate 5wt%, and calcium lignosulfonate 10wt%.

[0027] (2) Stirring of the mixture of iron tailings and curing agent: mix the iron tailings slurry and curing agent according to the mass flow rate on a dry basis: convert the iron tailings slurry with a mass concentration of 60% into 100 parts ...

Embodiment 2

[0030] Embodiment 2: as figure 1 Shown, the specific steps of this iron tailing solidification dry pile method are as follows

[0031](1) Preparation of curing agent: firstly dry, screen and crush 67 wt% steel slag, 3wt% desulfurized gypsum, 17.5wt% clinker, 4.5wt% quicklime, 7.5wt% fly ash and 0.5wt% additive Form particles with a size of less than 10mm, then mix them evenly according to the formula, and grind them after natural aging for 10 hours. It is prepared by mixing 40wt% sodium, 15wt% ferric chloride, 5wt% polyferric sulfate, and 20wt% calcium lignosulfonate.

[0032] (2) Stirring of the mixture of iron tailings and curing agent: mix iron tailings slurry and curing agent according to the mass flow rate on a dry basis: convert the iron tailings slurry with a mass concentration of 35% into 100 parts on a dry basis and 8 parts of curing agent Stir and mix in a continuous flow state to obtain a mixture, 10% of the slurry in the mixture is returned to the mixing tank to...

Embodiment 3

[0035] Embodiment 3: as figure 1 Shown, the specific steps of this iron tailing solidification dry pile method are as follows

[0036] (1) Preparation of curing agent: firstly dry, sieve and crush 81 wt% of steel slag, 1.8wt% of titanium gypsum, 10wt% of clinker, 2wt% of quicklime, 5wt% of fly ash and 0.2wt% of additives into sizes Particles smaller than 10mm are then mixed evenly according to the formula, and ground after natural aging for 8 hours. The fineness of the powder is controlled to 0.08mm and the sieve residue is 4%, so as to obtain the curing agent; the additives are sodium sulfate 20wt%, sodium chloride 50wt%, polyaluminum sulfate 10wt%, and calcium lignosulfonate 20wt%.

[0037] (2) Stirring of the mixture of iron tailings and curing agent: mix iron tailings slurry and curing agent according to the mass flow rate on a dry basis: convert the iron tailings slurry with a mass concentration of 20% into 100 parts on a dry basis and 10 parts of curing agent Stir and...

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Abstract

The invention relates to a curing and dry-piling method of iron tailings, belonging to the technical field of mine safety. The curing and dry-piling method comprises the following steps of: adding a curing agent and a chemical additive produced by adopting steel slag, chemical waste gypsum, clinker, coal ash and quick lime in tailing pulp, and synchronously realizing precipitation, water drainage and curing and pile-up by secondary mixing and stirring. Compared with the prior art, the curing and dry-piling method has the advantages of simple technical process, low cost, small occupied area and high safety, and is a new method for safe pile-up of the iron tailings.

Description

technical field [0001] The invention relates to a solidification and dry stacking method of iron tailings, which belongs to the technical field of mine safety. Background technique [0002] After crushing, ball milling, and wet beneficiation of iron ore, a low-grade waste residue mainly composed of silicate minerals, which accounts for more than 50% of the original ore, will be produced. This waste residue is called iron tailings. Due to the fine particles of iron tailings, strong water holding capacity, high water content, and low comprehensive utilization rate, there is a risk of dam failure during the tailings stockpiling process. [0003] my country is a big mining country, and more than 90% of the tailings are stored by damming upstream. In recent years, the collapse of tailings ponds in my country has occurred one after another, causing heavy casualties and environmental pollution, highlighting the traditional tailings stockpiling. There are security risks in this way....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B1/00
Inventor 张召述徐炜徐士申李金恩罗均耀唐国栋夏举佩伍祥罗中秋王金博
Owner KUNMING UNIV OF SCI & TECH
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