Method for consolidating heavy metal elements in copper slag

A heavy metal and copper slag technology, applied in solid waste management, climate sustainability, sustainable waste treatment, etc., can solve the problems of not fully considering the impact of arsenic on human health, limited disposal scale, and low added value, reaching Realize the large-scale disposal of copper slag hazardous waste and realize the effect of high value-added application

Pending Publication Date: 2021-05-28
BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above disposal methods do not fully consider the impact of leaching of heavy metals such as arsenic on groundwater, soil, plant pollution, and human health, and the disposal scale is limited and the added value is low

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] This embodiment provides a method for consolidating heavy metal elements in copper slag, comprising the following steps:

[0037] (1) After mixing copper slag, coal gangue and limestone according to the mass ratio of 20:70:10, grind them with a ball mill until the particles larger than 300 μm in the mixture are less than 5% of the total weight to obtain mixed raw meal;

[0038] In the copper slag, the concentration of arsenic is 69.2mg / kg (standard limit is 5mg / kg), the concentration of cadmium is 2.5mg / kg (standard limit is 1mg / kg), and the concentration of chromium is 1.3mg / kg (The standard limit is 5mg / kg), the concentration of copper is 1059.2mg / kg (the standard limit is 100mg / kg), the concentration of nickel is 3.6mg / kg (the standard limit is 5mg / kg), the concentration of lead is 1019.8mg / kg (the standard limit is 5mg / kg), and the concentration of zinc is 240.4mg / kg (the standard limit is 100mg / kg); according to GB5085.3-2007 "Identification of Hazardous Waste Iden...

Embodiment 2

[0049] This embodiment provides a method for consolidating heavy metal elements in copper slag, comprising the following steps:

[0050] (1) After mixing the mixture of copper slag, coal gangue, calcium oxide and magnesium oxide (mass ratio 4:6) according to the mass ratio of 45:51:4, use a ball mill to grind until the particles larger than 300 μm in the mixture are smaller than 5% of the total weight to get mixed raw meal;

[0051] In the copper slag, the concentration of arsenic is 69.2mg / kg (standard limit is 5mg / kg), the concentration of cadmium is 2.5mg / kg (standard limit is 1mg / kg), and the concentration of chromium is 1.3mg / kg (The standard limit is 5mg / kg), the concentration of copper is 1059.2mg / kg (the standard limit is 100mg / kg), the concentration of nickel is 3.6mg / kg (the standard limit is 5mg / kg), the concentration of lead is 1019.8mg / kg (the standard limit is 5mg / kg), and the concentration of zinc is 240.4mg / kg (the standard limit is 100mg / kg); according to GB5...

Embodiment 3

[0062] This embodiment provides a method for consolidating heavy metal elements in copper slag, comprising the following steps:

[0063] (1) After mixing copper slag, coal gangue, and bentonite according to the mass ratio of 59:40:1, grind them with a ball mill until the particles larger than 300 μm in the mixture are less than 5% of the total weight to obtain a mixed raw meal;

[0064] In the copper slag, the concentration of arsenic is 69.2mg / kg (standard limit is 5mg / kg), the concentration of cadmium is 2.5mg / kg (standard limit is 1mg / kg), and the concentration of chromium is 1.3mg / kg (The standard limit is 5mg / kg), the concentration of copper is 1059.2mg / kg (the standard limit is 100mg / kg), the concentration of nickel is 3.6mg / kg (the standard limit is 5mg / kg), the concentration of lead is 1019.8mg / kg (the standard limit is 5mg / kg), and the concentration of zinc is 240.4mg / kg (the standard limit is 100mg / kg); according to GB5085.3-2007 "Identification of Hazardous Waste Id...

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Abstract

The invention relates to the technical field of hazardous waste disposal in the metallurgical industry, in particular to a method for consolidating heavy metal elements in copper slag. The method comprises the following steps: mixing copper slag, mineral substances and an additive, and carrying out granulating, drying, and calcining, wherein the sum of SiO2 and Al2O3 in the mineral substances accounts for more than 50% of the total amount, and the ratio of SiO2 to Al2O3 is greater than or equal to 0.5; and the additive is selected from one or more of carbonate, sulfate, silicate, bentonite, montmorillonite, limestone, calcium oxide and magnesium oxide. According to the method, the specific copper slag is solidified through a specific method, and heavy metal elements in a solid substance leachate prepared according to GB5085.3-2007 Identification Standard for Identification of Hazardous Wastes are judged as common solid wastes according to HJ / T299. The granular material can replace natural gravel aggregate, and large-scale treatment and high-added-value application of the copper slag hazardous waste are achieved.

Description

technical field [0001] The invention relates to the technical field of hazardous waste disposal in the metallurgical industry, in particular to a method for consolidating heavy metal elements in copper slag. Background technique [0002] Copper slag is the slag produced in the process of copper smelting, which is a kind of non-ferrous metal slag; the waste slag discharged from copper smelting by reverberatory furnace method is reverberatory furnace copper slag, and the waste slag discharged by blast furnace copper smelting is blast furnace copper slag. For every ton of copper smelted, 10-20 tons of slag will be produced by the reverberatory furnace method, and 50-100 tons of copper slag by the blast furnace method. More importantly, the study found that due to the influence of the source of copper ore, the copper slag discharged by many copper smelting enterprises contains a large amount of heavy metal elements such as arsenic, chromium, cadmium, manganese, lead, zinc, nicke...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B18/30C04B18/12C04B18/14
CPCC04B18/12C04B18/141C04B18/30Y02W30/91
Inventor 王肇嘉刘艳军徐瑞来李沙李润峰
Owner BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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