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Preparation of rare-earth heavy-metal cured cement clinker from oyster shells and lead zinc tailings

A technology of cement clinker and oyster shells, which is applied in the field of environment and materials, and achieves the effect of simple method, easy acquisition and enhanced strength

Active Publication Date: 2015-03-04
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] After retrieval, there is no use of lead-zinc tailings and oyster shells as raw materials at home and abroad to use CeO 2 and ZrO 2 As a curing agent, prepare a method for curing cement clinker with rare earth heavy metals. This project is the first technology researched and invented at home and abroad.

Method used

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  • Preparation of rare-earth heavy-metal cured cement clinker from oyster shells and lead zinc tailings
  • Preparation of rare-earth heavy-metal cured cement clinker from oyster shells and lead zinc tailings
  • Preparation of rare-earth heavy-metal cured cement clinker from oyster shells and lead zinc tailings

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preparation example Construction

[0023] The specific steps of the preparation method using oyster shells and lead-zinc tailings to prepare rare earth type heavy metal solidified cement clinker are as follows:

[0024] (1) Ball mill the oyster shells in a ball mill for 2 hours to obtain oyster powder;

[0025] (2) Add the curing agent to 20% of the total mass of the raw materials in water, and stir for 30 minutes to obtain a suspension of the curing agent;

[0026] (3) Add the suspension to the lead-zinc tailings and oyster shell powder and mix well;

[0027] (4) After the raw material is pressed into a section, it is pre-fired in a furnace at 900°C for 1 hour;

[0028] (5) Increase the sintering temperature to 1350℃ for 1h;

[0029] (6) Our rare earth type heavy metal solidified cement clinker clinker will be obtained after being cooled to room temperature.

Embodiment 1

[0031] The weight ratio of the raw material formula: 31% lead-zinc tailings, 68.5wt% oyster shell, 0.5wt% curing agent (CeO 2 60wt%, ZrO 2 40wt%), weigh the three raw materials according to the formula, ball mill the oyster shells in a ball mill for 2 hours to obtain oyster powder, add the curing agent to the water of 20% of the total mass of the raw materials, stir for 30 minutes, and then add the lead-zinc tailings Stir evenly with the oyster shell powder. After pressing the raw material into sections, preheat it in a furnace at 900°C for 1 hour, heat it up to a sintering temperature of 1350°C for 1 hour, and cool it out of the furnace to room temperature to obtain our rare earth heavy metals. Curing cement clinker clinker.

[0032] According to GB1346-77, determine the initial setting and final setting time of the tailings Portland cement calcined at 1350℃, and test the tailings according to GB1 / 7671-1999 "Cement Mortar Strength Test Method (ISO)" The compressive strength of c...

Embodiment 2

[0038] The weight ratio of the raw material formula: 32wt% lead-zinc tailings, 67.5wt% oyster shell, 0.5wt% curing agent (CeO 2 60wt%, ZrO 2 40wt%), weigh the three raw materials according to the formula, ball mill the oyster shells in a ball mill for 2 hours to obtain oyster powder, add the curing agent to the water of 20% of the total mass of the raw materials, stir for 30 minutes, and then add the lead-zinc tailings Stir evenly with the oyster shell powder. After pressing the raw material into sections, preheat it in a furnace at 900°C for 1 hour, heat it up to a sintering temperature of 1350°C for 1 hour, and cool it out of the furnace to room temperature to obtain our rare earth heavy metals. Curing cement clinker.

[0039] According to GB1346-77, determine the initial setting and final setting time of the tailings Portland cement calcined at 1350℃, and test the tailings according to GB1 / 7671-1999 "Cement Mortar Strength Test Method (ISO)" The compressive strength of cement ...

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Abstract

The invention provides a method for preparing rare-earth heavy-metal cured cement clinker from oyster shells and lead zinc tailings, which comprises the following steps: by using the lead zinc tailings, oyster shells and a curing agent as raw materials, carrying out ball milling on the oyster shells in a ball mill to obtain powder, adding the curing agent, lead zinc tailing and water, uniformly mixing, pressing into sections, preheating and calcining, and cooling to room temperature to obtain the rare-earth heavy-metal cured cement clinker. The rare-earth heavy-metal cured cement clinker can lower the sintering temperature, perform the energy-saving function and effectively cure the heavy-metal ions in the lead zinc tailings, thereby implementing waste utilization. The method is simple and low in cost, has favorable economic benefit and environmental benefit, and can be well put into large-scale production.

Description

technical field [0001] The invention belongs to the field of environment and materials, and in particular relates to a method for preparing rare-earth heavy metal solidified cement clinker by using oyster shells and lead-zinc tailings. Background technique [0002] Lead-zinc tailings are produced in the beneficiation and sorting operations of lead-zinc ores, accounting for about 95% of the output of lead-zinc mines. A large amount of tailings not only occupy a lot of land, but also consume a lot of storage and management costs. At the same time, tailings Toxic and harmful substances in the environment, especially heavy metals, will migrate and transform after weathering and rainwater leaching, causing irreparable damage to the surrounding ecological environment. Therefore, it is the best choice to scientifically recycle tailings resources, turn waste into treasure, and achieve both environmental and economic benefits. However, a large number of discarded oyster shells have ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24C04B7/42
CPCY02P40/10
Inventor 于岩张复伟李冲许亚丽
Owner FUZHOU UNIV