Formula and method for commonly treating wet-method smelting slag and coal-series solid waste

A hydrometallurgy and solid waste technology, which is applied in the field of hydrometallurgy slag and coal-based solid waste treatment, can solve the problems of long treatment period and quick solution to the hazards of coal gangue accumulation

Active Publication Date: 2017-10-20
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has a long processing period and cannot fundamentally and quickly solve the accumulation hazards of coal gangue, so this method has great application limitations

Method used

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  • Formula and method for commonly treating wet-method smelting slag and coal-series solid waste
  • Formula and method for commonly treating wet-method smelting slag and coal-series solid waste

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] The ordinary wet smelting slag is dried and dehydrated at high temperature, so that the moisture content of the smelting slag is reduced from 78% to less than 10%. The fly ash itself has a moisture content of less than 5%, so it does not need to be dried, and can be directly ground and sieved for use.

[0063] The ground and sieved wet smelting slag and fly ash are uniformly mixed in mass percentages of 65:35; 60:40; 55:45; 50:50, respectively.

[0064] The mixture was melted at a high temperature at 1400°C and kept for 2 hours.

[0065] The mass percent of vitreous body in the vitrified products of the four mixtures is all greater than 70%, and the fourth formula, that is, the hydrometallurgy slag and coal gangue are mixed at a mass percentage of 50:50, and the vitreous body content obtained by melting the mixture can reach up to 85% (detection method for XRD). The vitreous body content under each proportioning ratio is as follows Table 1. The leaching toxicity of he...

Embodiment 2

[0069] The ordinary wet smelting slag is dried and dehydrated at high temperature, so that the moisture content of the smelting slag is reduced from 78% to less than 10%. The fly ash itself has a moisture content of less than 5%, so it does not need to be dried, and can be directly ground and sieved for use.

[0070] The wet smelting slag and fly ash after grinding and sieving are mixed uniformly at a mass percentage of 50:50, and the mixture is respectively placed under the conditions of 1200°C, 1250°C, 1300°C, 1350°C, 1400°C, 1450°C, and 1500°C Melt at high temperature and keep warm for 2h.

[0071] Under the seven conditions, the vitreous body content in the vitrified product was lower than 70% at 1200°C, and the others were all higher than 70%, and as the melting temperature increased, the vitreous body content in the vitrified product increased, up to more than 85% (the detection method is XRD, the specific results are shown in Table 2). The leaching toxicity of heavy me...

Embodiment 3

[0075] The ordinary wet smelting slag is dried and dehydrated at high temperature, so that the moisture content of the smelting slag is reduced from 78% to less than 10%. The fly ash itself has a moisture content of less than 5%, so it does not need to be dried, and can be directly ground and sieved for use.

[0076] The wet smelting slag and fly ash after grinding and sieving were mixed evenly at a mass percentage of 50:50, and the mixture was melted at 1400°C, and the holding time was 1.0h, 1.5h, 2.0h, 2.5h, and 3h respectively.

[0077] Under the five conditions, the vitreous body content in the vitrified product was lower than 70% at 1.0h, and all others were higher than 70%. With the prolongation of the holding time, the vitreous body content in the vitrified product increased, up to more than 85% (the detection method was XRD , see the following table 3 for specific values). The leaching toxicity of heavy metals was determined by TCLP method, all of which were lower than...

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Abstract

The invention discloses a formula and a method for commonly treating wet-method smelting slag and coal-series solid wastes. The formula is prepared from the following components in percentage by mass: 50 percent to 75 percent of the wet-method smelting slag and 25 percent to 50 percent of the coal-series solid wastes; the coal-series solid wastes comprise fly ash or coal gangues. The method comprises the following steps: (1) after dehydrating and drying the wet-method smelting slag, crushing and sieving; after crushing the coal-series solid wastes, sieving; (2) mixing the sieved wet-method smelting slag and the sieved coal-series solid wastes according to a ratio to obtain a mixture; carrying out high-temperature melting on the obtained mixture to obtain a vitrified product. In the view of simplicity and feasibility and universality, the wet-method smelting slag, the coal gangues or the fly ash is directly used for carrying out common treatment and pure chemical substances are not additionally added; wastes are treated by wastes and a plurality of types of the wastes are cooperatively treated; the harmlessness of the wet-method smelting slag and the coal gangues is realized through a vitrification manner.

Description

technical field [0001] The invention relates to the field of treatment of hydro-smelting slag and coal-based solid waste, in particular to a vitrification formula and method for co-processing hydro-smelting slag and coal-based solid waste. Background technique [0002] Hydrosmelting is widely used because of its high efficiency in extracting metals, but the hydrosmelting slag left after extracting metals cannot be directly recycled as resources, and some hydrosmelting slags have certain dangerous characteristics. At present, the commonly used follow-up treatment and disposal processes of hydrometallurgy slag mainly include solidification, stabilization and co-processing in cement kilns. The limited volume cannot be continuously received; in order to ensure the quality of cement, cement kiln co-processing has strict requirements on the characteristics of materials entering the kiln and the amount of co-processing waste, which makes cement kiln co-processing unable to meet the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C6/10C04B14/22
CPCC03C1/002C04B14/22
Inventor 龙於洋王恒怡杨煜强沈东升冯华军
Owner ZHEJIANG GONGSHANG UNIVERSITY
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