Method of directly producing ultra-fine lead oxide powder from galena concentrate

The technology of galena and concentrate is applied in the field of preparing ultrafine lead oxide powder, which can solve the problems of easy damage of crystal lattice, environmental pollution and high energy consumption, and achieves the reduction of the content of impurity elements, the reduction of production costs, and the expansion of raw materials. effect of source

Inactive Publication Date: 2007-02-28
CENT SOUTH UNIV
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Problems solved by technology

The traditional method of producing PbO powder is produced by the metal lead method. After the metal lead is melted, it is granulated and pulverized, and then oxidized and roasted in a re-oxidation furnace to form a lead oxide product. The main problem of this process is: lead metal is required, and lead Metal smelting has disadvantages such as high energy consumption and serious environmental pollution. In addition, the product activity is not high (difficult to refine the particle size and the crystal lattice is easy to be destroyed).

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  • Method of directly producing ultra-fine lead oxide powder from galena concentrate

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Embodiment Construction

[0039] 1. The galena concentrate of a lead-zinc mine is used, and the -0.074mm particle size accounts for 85%. The chemical composition is shown in Table 1.

[0040] Pb

Fe

Zn

Cu

C

S

CaO

MgO

SiO 2

58.80

12.52

0.41

0.037

0.57

25.04

0.068

0.038

1.64

[0041] The leaching process conditions are: the leaching solid-liquid ratio is 1 / 4, the pH of the solution is adjusted to 1.20 with hydrochloric acid, the reaction time is 40 minutes, and the reaction temperature is 85°C; the leaching agent FeCl 3 ·6H 2 The amount of O used is 350g / L, and the amount of NaCl is 100g / L. The lead leaching rate can reach 97.39%, and the leaching product lead chloride (PbCl 2 ) purity is shown in Table 2.

[0042] name

W(Cu) / %

W(Fe) / %

W(Zn) / %

W(Ca) / %

PbCl 2

0.0002

0.0035

0.0009

0.0150

[0043] Leaching products from galena conc...

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PUM

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Abstract

The invention relates the method for producing super fine lead oxide powder from blue lead finished ore. The method comprises the following steps: using blue lead finished ore as raw material, leaching, crystallizing, getting PbCl2 crystal, adding sulfuric acid into PbCl2 crystal to get PbSO4 powder, carrying out chemical precipitation method for PbSO4 powder, getting the mixture of PbCO3 and 2PbCO3.Pb(OH)2, carrying out thermal decomposition, and getting the ultra-fine and high-purity beta-PbO. The method has the advantages of reducing the cost, extending the origin of raw materials, and reducing the impurity. The product has high activity, and the particle mean size of the products is 4.0-5.0 mum.

Description

[0001] Technical Field The present invention relates to a method for directly preparing ultrafine lead oxide (β-PbO) powder from galena concentrate. Background technique [0002] Lead oxide is a common active material in chemical power sources, especially lead-acid batteries, and it can be used as an additive for rechargeable alkaline manganese batteries to make MnO 2 It exhibits good reversibility during deep discharge. The traditional method of producing PbO powder is produced by the metal lead method. After the metal lead is melted, it is granulated and pulverized, and then oxidized and roasted in a re-oxidation furnace to form a lead oxide product. The main problem of this process is: lead metal is required, and lead Metal smelting has disadvantages such as high energy consumption, serious environmental pollution, and low product activity (difficult to refine the particle size and easy damage to the crystal lattice). Contents of the invention [0003] In order to solve ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/00C22B3/04C22B3/20C01G21/06
CPCY02P10/20
Inventor 覃文庆刘辉孙伟徐本军王军
Owner CENT SOUTH UNIV
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