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Lead-zinc oxide ore recycling and harmless treatment system and method

A harmless treatment and lead-zinc oxide technology, which is applied in waste heat treatment, energy efficiency improvement, lighting and heating equipment, etc., can solve the problems of restricting the resource utilization of lead-zinc oxide, high energy consumption of smelting equipment, complex treatment process, etc., to achieve Improve processing capacity and heat utilization rate, reduce production cost, and strengthen the effect of metallurgical reaction process

Pending Publication Date: 2020-12-08
YUNNAN CHIHONG ZINC & GERMANIUM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The beneficiation process mainly uses flotation agents to enrich sulfide ore. Scholars at home and abroad have done a lot of research on the sulfide ore beneficiation process, so I won’t go into details here. Flotation, the treatment process is more complicated, the cost is higher, and the yield is low
Existing smelting equipment has high energy consumption and high production costs, which are increasingly unacceptable by enterprises. The problems of high energy consumption and high cost have become the main constraints to the resourceful and harmless treatment of low-grade lead and zinc oxide. question

Method used

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  • Lead-zinc oxide ore recycling and harmless treatment system and method
  • Lead-zinc oxide ore recycling and harmless treatment system and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of lead-zinc oxide resource harmless treatment system, such as figure 1 As shown, the treatment system includes: a preheating unit 1 , a precalciner 2 , a rotary kiln 3 and a cooling machine 4 .

[0037] The preheating unit 1 is connected with the precalcining furnace 2. In the preheating unit 1, the lead-zinc oxide material is directly or indirectly contacted with the zinc oxide flue gas from the precalcining furnace 2, and the preheating of the lead-zinc oxide material is completed. Unit 1 can use any gas-solid heat exchange equipment that can realize direct or indirect contact heat exchange between zinc oxide dust and lead-zinc oxide materials, such as: cyclone preheating unit, multi-hearth furnace preheating unit and the inner layer is a material channel, and the outer layer is a material channel. The layer is the casing heat exchange equipment such as the flue gas channel, etc. In the preheating unit 1, the preheating of the lead-zinc oxide material is real...

Embodiment 2

[0046] A lead-zinc oxide ore recycling and harmless treatment system, the preheating unit is a cyclone preheating unit, and the rest are the same as in Embodiment 1. Such as figure 2 As shown, the treatment system includes: cyclone preheating unit 1, precalciner 2, rotary kiln 3 and cooler 4. Cyclone preheating unit 1 is composed of 5-stage cyclone dust collectors connected by pipelines (as attached figure 2 As shown, C1 represents the first-stage cyclone dust collector, C2 represents the second-stage cyclone dust collector, and so on). The lead-zinc oxide ore is added from the connecting pipe between the first-stage cyclone dust collector C1 and the second-stage cyclone dust collector C2 of the preheating unit. The lead-zinc oxide ore directly contacts the flue gas in the cyclone dust collector and the pipe to exchange heat, and the flue gas The waste heat in the furnace is recovered, and the lead-zinc oxide ore is preheated to 600°C-900°C. The flue gas outlet of the pre...

Embodiment 3

[0067] Embodiment 3: (Cyclone preheating unit preheating)

[0068] A lead-zinc oxide ore recycling harmless treatment method, the specific steps are as follows:

[0069](1) The composition of 50000t raw materials is Pb 2.26% Zn 9.73% CaO 21.86% SiO 2 28.34%Al 2 o 3 0.35% MgO 0.57% S 4.34% (lead, zinc oxidation rate up to 60%) low-grade lead-zinc oxide ore is crushed and ball milled in sequence. After crushing, the particle size ≤ 25mm accounts for 70%; the material is ball milled to a particle size ≤ 60μm, and the moisture content is ≤ 0.8%.

[0070] (2) Divide 10,000t of anthracite coal with a carbon content of 60%, 2mm≤particle size≤6mm, and moisture≤8% into two parts, of which 5000t is ball-milled, with powdered coal particle size≤60μm and moisture≤0.6%; the other 5000t is prepared as 2mm≤ Granular coal with a particle size of ≤8mm and a moisture content of ≤10% is stockpiled for future use.

[0071] (3) A production system with a processing capacity of 3000t / d is ado...

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Abstract

The invention relates to a lead-zinc oxide ore recycling and harmless treatment system and method, and belongs to the technical field of lead-zinc oxide ore treatment. The lead-zinc oxide ore recycling and harmless treatment system comprises a preheating unit, a pre-decomposition furnace, a rotary kiln and a cooling machine, wherein lead-zinc oxide ore is added from the preheating unit, and entersthe pre-decomposition furnace after being heated by direct contact preheating or indirect contact heat exchange with flue gas, the temperature of the material is further increased, and the material enters the rotary kiln to be subjected to a reduction volatilization reaction; zinc oxide smoke dust produced by reduction and volatilization in the rotary kiln is enriched and then recycled; and secondary hot air and low-temperature harmless slag are produced after slag produced by the rotary kiln is cooled by the cooler, the secondary hot air is sent to the pre-decomposition furnace, is used fordrying the material and is recycled by a waste heat boiler, and the harmless slag can be used for producing building materials. According to the lead-zinc oxide ore recycling and harmless treatment system and method, waste heat of flue gas and slag is fully recycled, the advantage of a large specific surface area of powder is fully utilized, the heat exchange and reduction volatilization speeds are increased, the lead-zinc oxide ore treatment capacity and the heat energy utilization rate are greatly increased, and the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of lead-zinc oxide ore treatment, and in particular relates to a low-grade lead-zinc oxide ore recycling harmless treatment system and method. Background technique [0002] The ore structure of lead-zinc oxide ore is complex, and the ore processing is difficult, especially for low-grade lead-zinc oxide ore. At the same time, with the continuous development and utilization of high-quality lead and zinc resources, the efficient development and utilization of low-grade lead-zinc oxide ores is becoming increasingly important; while mining high-quality lead and zinc resources, a large number of low-grade lead-zinc oxide ores are The high processing cost and unutilized storage in mines not only cause waste of resources, but also cause serious damage to the ecological environment of mining areas. How to economically and efficiently utilize low-grade lead-zinc oxide ore has always been a major problem facing the le...

Claims

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Application Information

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IPC IPC(8): C22B13/02C22B19/00F27D17/00
CPCC22B13/02C22B19/00F27D17/004Y02P10/25
Inventor 杨大锦代龙果贾著红马雁鸿杨伟何勇毅裴启飞
Owner YUNNAN CHIHONG ZINC & GERMANIUM
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