Method for recycling low-grade lead and zinc in pyrite cinder

A pyrite slag, low-grade technology is applied in the field of beneficiation and metallurgy, which can solve the problems of large waste of iron resources, loss of non-ferrous metals, environmental pollution, etc., and achieves reduction of investment cost and production cost, simple process method, environmental protection, and process. Simple process effect

Inactive Publication Date: 2012-09-26
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

Due to the difficulty in beneficiation of sulfuric acid slag, the recovery rate of iron is low, and the waste of iron resources is large. At the same time, in the process of magnetic separation, since non-ferrous metals such as lead and zinc are not magnetic, a large amount of them will be lost in the secondary tailings of slag beneficiation. cause the loss of non-ferrous metals
[0006] The inventor applied for and obtained the patent right, and the patent number is ZL200410079527.4 "Production method of high-iron and low-sulfur pyrite slag", which does not involve lead-zinc-sulfur pyrite raw materials that are difficult to separate. For raw materials that are difficult to separate lead-zinc from pyrite, no effective means has been proposed, so for lead-zinc-containing pyrite slag, this method cannot effectively recover the lead-zinc resources.
[0007] Based on the above technical conditions, at present, a large number of lead-zinc-containing pyrite resources formed due to the difficulty of separating lead-zinc-sulfur can only be extracted from sulfuric acid, and the iron oxides in it cannot be used as raw materials for ironmaking due to the lead-zinc content, and can only be extracted from pyrite Cinders are stored in the form of piles, causing serious environmental pollution. If an advanced process and method can be used to effectively recycle the lead and zinc, the iron resources will also be utilized, which will produce good economic and environmental benefits.

Method used

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  • Method for recycling low-grade lead and zinc in pyrite cinder
  • Method for recycling low-grade lead and zinc in pyrite cinder

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Embodiment 1: the specific steps of the recycling method of low-grade lead and zinc in the pyrite slag of the present embodiment:

[0044] (1) Add 0.5wt% bentonite of slag, 10wt% of Ash is divided into 10wt% pulverized coal to form a mixture, then add water of 11wt% of the mixture, stir and mix evenly;

[0045] (2) Moisturize the aqueous mixture obtained in step (1), so that the mass percentage content of the pyrite slag smaller than 0.074mm in particle size is greater than 80%, and then make the particle size 5-10mm pellets, and finally dry the pellets at 200°C until the water content is less than 0.5wt%;

[0046] (3) Reduce and roast the dry pellets with coke oven gas at 1000°C for 120 minutes to obtain iron pellets with an iron content of 54wt% and a lead and zinc content of less than 0.3wt%. Settling, cooling, and dry dust collection to obtain lead-zinc mixed concentrate.

Embodiment 2

[0047] Embodiment 2: the specific steps of the recycling method of low-grade lead and zinc in the pyrite slag of the present embodiment:

[0048] (1) To the pyrite slag (lead and zinc 4wt%, iron 56wt%, the rest is calcium oxide, magnesium oxide, silicon dioxide and aluminum oxide) in turn add 0.8wt% of the slag Palido, 8wt% The ash is divided into 10wt% coal dust to form a mixture, then add the water of mixture 11.5wt%, stir and mix;

[0049](2) Moisturize the aqueous mixture obtained in step (1), so that the mass percentage content of the pyrite slag smaller than 0.074mm in particle size is greater than 80%, and then make the particle size The pellets are 5-12mm, and finally the pellets are dried at 250°C until the water content is less than 0.4wt%;

[0050] (3) The dried pellets were reduced and roasted at 1100°C for 100 minutes with gas from the gasifier to obtain iron pellets with an iron content of 58wt% and a lead and zinc content of less than 0.25wt%. Gravity settling...

Embodiment 3

[0051] Embodiment 3: the specific steps of the recycling method of low-grade lead and zinc in the pyrite slag of the present embodiment:

[0052] (1) Add 1.2wt% bentonite, 5wt% Ash is divided into 10wt% pulverized coal to form a mixture, then add 12wt% water of the mixture, stir and mix evenly;

[0053] (2) Moisturize the aqueous mixture obtained in step (1), so that the mass percentage content of the pyrite slag smaller than 0.074mm in particle size is greater than 80%, and then make the particle size 10-15mm pellets, and finally dry the pellets at 300°C until the water content is less than 0.3wt%;

[0054] (3) Reduce and roast the dry pellets with coal gas (coke oven gas or gas generator gas) at 1250°C for 60 minutes to obtain iron pellets with an iron content of 60wt% and a lead and zinc content of less than 0.3wt%. , The flue gas produced by roasting is subjected to gravity settling, cooling, and dry dust collection to obtain lead-zinc mixed concentrate.

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Abstract

The invention discloses a method for recycling low-grade lead and zinc in pyrite cinder, and belongs to the technical field of ore dressing metallurgy. The method comprises the following steps of: adding pulverized coal and adhesive into the pyrite cinder containing lead and zinc, regulating the moisture, performing wet grinding, pelletizing, drying pellets at a low temperature, performing high-temperature reductive roasting by using gas, collecting dust from the roasting smoke, and thus obtaining lead and zinc mixed concentrate, wherein the roasted pellet ore is an iron-making raw material containing 54 to 60 percent of iron and less than 0.3 percent of lead and zinc. By pelletizing the cinder, carrying out combined reductive roasting with the pulverized coal and the gas and recovering the lead and the zinc from the smoke according to the method, lead and zinc resources which are difficult in lead-zinc-sulfur flotation separation and are greatly lost in the pyrite cinder are efficiently recovered, and the iron resource in the pyrite cinder is also efficiently utilized.

Description

technical field [0001] The invention relates to a method for comprehensively recycling lead and zinc resources from pyrite slag containing lead and zinc, which is difficult to separate from ore dressing, and belongs to the technical field of ore dressing and metallurgy. Background technique [0002] Sulfide-lead-zinc ore often coexists with pyrite, and the recycling of lead-zinc resources must involve the separation of lead-zinc ore and pyrite. Due to the dense symbiosis of lead, zinc and sulfur, the surface properties of lead-zinc sulfide minerals and pyrite are similar, and flotation separation is difficult, so a considerable part of lead-zinc sulfide ore is lost in pyrite. When pyrite is roasted and desulfurized to produce sulfuric acid, lead and zinc enter pyrite slag, resulting in the loss of a large amount of lead and zinc resources. Therefore, the separation of lead, zinc and sulfur has always been a hot issue that has not been fundamentally solved in the mineral proc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/242C22B1/248C22B1/02C22B5/08C22B13/00C22B19/30
CPCY02P10/20
Inventor 文书明周兴龙龙泽毅柏少军刘丹曹沁波沈海英
Owner KUNMING UNIV OF SCI & TECH
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