Method for preparing lead directly from lead-containing material by solid phase reaction

Patent metadata

Field	Value
Publication number	US-2020377971-A1
Application number	US-201916576765-A
Country	US
Kind code	A1
Filing date	Sep 20, 2019
Priority date	May 27, 2019
Publication date	Dec 3, 2020
Grant date	—

Abstract

A method for preparing lead directly from a lead-containing material by a solid phase reaction, includes: step 1, adding the lead-containing material to be processed to the grinder, and adding a metal substance and water to the grinder, wherein an activity of the metal substance is larger than that of lead; the solid phase reaction between the lead-containing material and the metal substance is caused directly by the grinder through a mechanical force to obtain a reaction product; step 2, washing and filtering the reaction product to obtain the lead and a metal salt solution corresponding to the metal substance; step 3, performing a melt casting on the lead to obtain a crude lead, crystallizing the metal salt solution to obtain a metal salt corresponding to the metal substance.

First claim

What is claimed is:

1 . A method for preparing lead directly from a lead-containing material by a solid phase reaction, comprising the following steps:
step 1, adding the lead-containing material to be processed to a grinder, and adding a metal substance and water to the grinder, wherein an activity of the metal substance is larger than that of lead; wherein, a solid phase reaction between the lead-containing material and the metal substance is caused directly by the grinder through a mechanical force to obtain a reaction product; step 2, washing and filtering the reaction product to obtain the lead and a metal salt solution corresponding to the metal substance; step 3, performing a melt casting on the lead to obtain a crude lead, and crystallizing the metal salt solution to obtain a metal salt corresponding to the metal sub stance.

2 . The method for preparing the lead directly from the lead-containing material by the solid phase reaction according to claim 1 , wherein, the grinder is one selected from the group consisting of a rod mill, a stirring mill, and a ball mill.

3 . The method for preparing the lead directly from the lead-containing material by the solid phase reaction according to claim 1 , wherein, the metal substance is one selected from the group consisting of zinc, iron, and aluminum.

4 . The method for preparing the lead directly from the lead-containing material by the solid phase reaction according to claim 3 , wherein, the zinc is one or more selected from the group consisting of zinc powder, zinc sheets, and zinc particles; the iron is one or more selected from the group consisting of iron powder, scrap iron, iron wires, and iron sheets; the aluminum is one or more selected from the group consisting of aluminum powder, aluminum sheets, aluminum foils, and aluminum wires.

5 . The method for preparing the lead directly from the lead-containing material by the solid phase reaction according to claim 1 , wherein, the metal salt solution is a sulfate solution or a chloride solution corresponding to the metal substance.

6 . The method for preparing the lead directly from the lead-containing material by the solid phase reaction according to claim 1 , wherein, the lead-containing material is a lead paste containing 60% to 75% of lead or a lead residue containing 20% to 60% of lead; the lead residue is one or more selected from the group consisting of a lead sulphate residue, a lead chloride residue and a lead oxide residue.

7 . The method for preparing the lead directly from the lead-containing material by the solid phase reaction according to claim 1 , wherein, an amount of the metal substance is 0.9 to 1.5 times of a theoretical amount allowing the lead in the lead-containing material to react sufficiently.

8 . The method for preparing the lead directly from the lead-containing material by the solid phase reaction according to claim 1 , wherein, in the step 1, a weight ratio of a grinding medium to a reaction material in the grinder is 2 to 20:1, a ratio of the water to a solid material is 0 to 5:1, a unit of the ratio of the water to the solid material is m 3 /t, and a reaction time is 0.1 to 5 h.

9 . The method for preparing the lead directly from the lead-containing material by the solid phase reaction according to claim 1 , wherein, in the step 1, the lead-containing material is a lead paste or a lead oxide residue; and the method further comprises adding sulfuric acid or hydrochloric acid to the water, and controlling a pH of the solution at 1.0 to 5.0 during the reaction.

10 . The method for preparing the lead directly from the lead-containing material by the solid phase reaction according to claim 1 , wherein, in the step 3, a temperature of performing the melt casting on the lead is 500° C. to 700° C., and an amount of coal is 0 to 5% of a weight of the lead to be melt casted.

Assignees

• Univ Beijing Science & Technology

Inventors

• Wang Chengyan

Classifications

• C22B7/00 Primary

  Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; {Methods of a general interest or applied to the winning of more than two metals (briquetting of scrap C22B1/248; preliminary treatment of scrap C22B1/005)} · CPC title

• Y02P10/20

  Recycling · CPC title

• C22B13/045 Primary

  Recovery from waste materials · CPC title

• C22B3/08

  Sulfuric acid {, other sulfurated acids or salts thereof} · CPC title

• C22B7/007

  by acid leaching · CPC title