A method for treating zinc smelting sludge by microwave method

A technology of zinc smelting and microwave method, applied in the field of comprehensive utilization of resources and environmental protection, can solve the problems of high environmental risk, high energy consumption, low efficiency, etc., and achieve the effect of overcoming high energy consumption, ensuring heating efficiency, and ensuring recycling efficiency

Active Publication Date: 2019-10-29
云南省固体废物管理中心
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the present invention provides a method for treating zinc smelting sludge by microwave method, which overcomes the problems of high energy consumption, low efficiency and high environmental risk existing in existing zinc smelting sludge recycling technology, and realizes zinc smelting sludge recycling. Harmless and resourceful treatment of sludge with high efficiency and low consumption

Method used

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  • A method for treating zinc smelting sludge by microwave method
  • A method for treating zinc smelting sludge by microwave method
  • A method for treating zinc smelting sludge by microwave method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The microwave treatment method for zinc smelting sludge described in this embodiment specifically includes the following steps:

[0022] 1) Pretreatment and batching and mixing: take the zinc smelting sludge from plant 1 (the composition analysis results are listed in Table 1) and auxiliary materials, the drying microwave output power is 1200W, and the drying time is 15min; the drying microwave output power range of auxiliary materials is 500W, drying time is 8min. The dried sludge and auxiliary materials were ball milled and sieved with a mesh size of 180 meshes, and the under-sieved materials were prepared and mixed according to the ratio in Table 2.

[0023] Table 1 Composition analysis table of zinc smelting sludge

[0024]

[0025] Table 2 Proportion 1#

[0026]

[0027]

[0028] 2) Recovery of valuable metals: The raw materials are heated and stirred by microwave, the stirring rate is 180rmp, the microwave output power is 3kW, the temperature in the rea...

Embodiment 2

[0033] The microwave treatment method for zinc smelting sludge described in this embodiment specifically includes the following steps:

[0034] 1) Pretreatment and batching and mixing: take the zinc smelting sludge from plant 2 (the composition analysis results are listed in Table 4) and auxiliary materials, the drying microwave output power range is 1500W, and the drying time is 10min; the drying microwave output power range of auxiliary materials It is 850W, and the drying time is 5 minutes. The dried sludge and auxiliary materials were ball milled and sieved with a mesh size of 200, and the under-sieved material was prepared and mixed according to the ratio in Table 5.

[0035] Table 4 Zinc smelting sludge composition analysis table

[0036]

[0037] Table 5 Proportion 2#

[0038]

[0039] 2) Valuable metal recovery: The raw materials are heated and stirred by microwave, the stirring rate is 200rmp, the microwave output power is 5kW, the temperature in the reactor i...

Embodiment 3

[0042] The microwave treatment method for zinc smelting sludge described in this embodiment specifically includes the following steps:

[0043] 1) Pretreatment and batching and mixing: Take the zinc smelting sludge from plant 3 (the composition analysis results are listed in Table 6) and auxiliary materials, the drying microwave output power range is 800W, and the drying time is 30min; the drying microwave output power range of auxiliary materials It is 400W, and the drying time is 15 minutes. The dried sludge and auxiliary materials are ball milled and sieved with a mesh size of 160 mesh.

[0044] Table 6 Zinc smelting sludge composition analysis table

[0045]

[0046] Table 7 ratio 3#

[0047]

[0048] 2) Valuable metal recovery: The raw materials are heated and stirred by microwave, the stirring rate is 260rmp, the microwave output power is 6kW, the temperature inside the reactor is 920°C, and the dust generated is collected by a combination of high temperature resi...

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Abstract

The invention relates to a method for treating zinc smelting sludge through a microwave method, and belongs to the technical field of comprehensive resource utilization and environmental protection. The method particularly comprises the steps that the zinc smelting sludge and auxiliary materials are dried through microwaves separately, and ball milling and screening are conducted on the dried sludge and auxiliary materials; the screened sludge and auxiliary materials are taken to be proportioned and mixed; the obtained mixture is put into a microwave reactor to be heated through microwaves, and smoke dust generated in the heating process is collected. According to the method, by means of a microwave drying technology, energy consumption can be effectively reduced, the drying time can be shortened, and the drying efficiency can be improved; water can be removed through pretreatment, and the materials are preheated, so that the recycling efficiency of valuable metals and the stability of the technology can be guaranteed, and a microwave oven and dust collecting equipment are prevented from being corroded; valuable metal recycling is conducted on the zinc smelting sludge through the microwave method, the problem that traditional energy consumption is high can be solved, the significant economic value and social benefit are achieved, and the technology is suitable for treating the sludge containing low-grade zinc.

Description

technical field [0001] The invention belongs to the technical field of resource comprehensive utilization and environmental protection, and in particular relates to a microwave method for treating zinc smelting sludge. Background technique [0002] The national "Twelfth Five-Year Plan for the Prevention and Control of Pollution by Hazardous Wastes" clearly states that "it is necessary to strengthen the harmless utilization and disposal of hazardous wastes containing heavy metals. Harmful utilization and disposal, and promote the construction of non-ferrous metal smelting hazardous waste utilization and disposal bases”, the prevention and control of heavy metal pollution is still the top priority of the 13th Five-Year Plan. Zinc smelting neutralization slag is the neutralization slag produced by neutralizing acidic wastewater during zinc smelting. It is produced in large quantities and contains heavy metals such as Pb, Zn, Cd, Hg, As, etc. It is a hazardous waste (HW48) and h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F11/00C02F11/131C02F11/18C22B19/30C22B19/04C02F101/20C02F103/16
CPCC02F11/00C02F11/12C02F11/18C02F2101/20C02F2103/16C22B19/04C22B19/30Y02P10/20
Inventor 胡若鹏杨雪赵杨安俊菁孙科源黄凯邢杰何宗良毕婷婷李贞王晓丽
Owner 云南省固体废物管理中心
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