Long-acting evaluation method for active magnesium oxide solidified/stabilized zinc-containing smelting slag based on carbonation accelerated exposure

A technology of active magnesium oxide and zinc smelting slag, which is applied in the direction of instruments, analytical materials, measuring devices, etc., can solve the problems of reducing the compressive strength of heavy metal leaching, reducing the buffer capacity of solidified body, and affecting the release performance of heavy metals, etc., to achieve outstanding gelation The effects of strong bonding strength, strong physical adsorption capacity, and wide-ranging practicability

Pending Publication Date: 2022-05-03
NANJING NORMAL UNIVERSITY
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, long-term carbon dioxide carbonation may affect the release performance of heavy metals in zinc-containing slags
Carbon dioxide carbonation can reduce the leaching of heavy metals and increase the compressive strength of the solidified body by changing the mineralogy structure of the cement hydration reaction product; however, carbon dioxide carbonization c

Method used

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  • Long-acting evaluation method for active magnesium oxide solidified/stabilized zinc-containing smelting slag based on carbonation accelerated exposure
  • Long-acting evaluation method for active magnesium oxide solidified/stabilized zinc-containing smelting slag based on carbonation accelerated exposure
  • Long-acting evaluation method for active magnesium oxide solidified/stabilized zinc-containing smelting slag based on carbonation accelerated exposure

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0034] Example 1

[0035] In terms of parts by mass, 100 parts of lead-zinc slag, 2 parts of activated magnesium oxide, and 66 parts of water were uniformly stirred and mixed to prepare a cementitious material slurry. The material is placed in a curing box (temperature 20° C., relative humidity ≥ 95%) for curing for 14 days and 100 days to obtain a cemented and cured zinc-containing slag-based gelling material.

Example Embodiment

[0036] Example 2

[0037] In parts by mass, 100 parts of lead-zinc slag, 5 parts of activated magnesium oxide and 66 parts of water were uniformly stirred and mixed to prepare a cementitious material slurry. The material is placed in a curing box (temperature 20° C., relative humidity ≥ 95%) for curing for 14 days and 100 days to obtain a cemented and cured zinc-containing slag-based gelling material.

Example Embodiment

[0038] Example 3

[0039] In terms of parts by mass, 100 parts of lead-zinc slag, 10 parts of activated magnesium oxide and 66 parts of water were uniformly stirred and mixed to prepare a cementitious material slurry. The material was placed in a curing box (temperature 20° C., relative humidity ≥ 95%) for curing for 14 days and 100 days to obtain a cemented and cured zinc-containing slag-based gelling material.

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Abstract

The invention discloses a long-acting evaluation method for active magnesium oxide solidified/stabilized zinc-containing smelting slag based on carbonation accelerated exposure. The long-acting evaluation method comprises the following steps: adding active magnesium oxide to carry out solidification/stabilization treatment on the zinc-containing smelting slag, and maintaining; the method comprises the following steps: preparing saturated CO2 water, measuring the pH value, carrying out accelerated carbonation continuous extraction on zinc-containing smelting slag after active magnesium oxide treatment and untreated zinc-containing smelting slag, and measuring the pH value, the conductivity, the magnesium ion concentration and the zinc ion concentration of an extract liquid; based on the change rule of pH, conductivity and magnesium ions in the leaching solution, determining the number of times of accelerated carbonation leaching; and based on the corresponding relation between the average concentration of the accumulated leaching liquid zinc and the accumulated carbonic acid exposure, the endurance capacity of the repaired slag body to carbonic acid is evaluated. According to the method, an accelerated carbonation exposure test is designed, key environmental factors influencing the release behavior of zinc in the active magnesium oxide solidified/stabilized zinc-containing smelting slag are considered, and the long-term activation risk of zinc in the smelting slag after solidification/stabilization repair is systematically evaluated.

Description

technical field [0001] The invention relates to the research field of harmless treatment of solid waste, in particular to a long-term evaluation method for solidified / stabilized zinc-containing smelting slag based on carbonation accelerated exposure. Background technique [0002] my country is the main producer of zinc concentrate in the world. During the high-temperature smelting process, the slag discharged from the zinc ore will be quenched by water to produce a large amount of zinc-containing smelting slag, which mainly exists in the form of glass phase and has potential hydraulic activity. With the rapid development of the zinc metallurgical industry, the production of zinc-containing smelting slags in my country is huge and the utilization rate is relatively low. Therefore, there are disorderly accumulations of zinc-containing smelting slags in many occasions, and the release of heavy metals such as zinc leads to high environmental risk. [0003] Solidification / stabili...

Claims

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Application Information

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IPC IPC(8): G01N33/00C04B28/10C04B40/02C04B111/23
CPCG01N33/00C04B28/105C04B40/0281C04B2111/00991C04B2111/23C04B2111/00017C04B18/0472
Inventor 李继宁王风贺余荣达张颖王千慧鲁绪幸
Owner NANJING NORMAL UNIVERSITY
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