Mehtod for producing zinc concentrate and lead concentrate using zinc oxide ore and zinc slag

A technology for zinc oxide ore and zinc concentrate, which is applied in the fields of lead-zinc beneficiation and solid waste recycling, can solve the problems of shortened anode life, reduced zinc quality, waste of resources, etc. Effect

Inactive Publication Date: 2006-11-08
TONGJI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the zinc scum contains 0.5-2% chlorine, if the zinc smelting process is used directly, the impurity chlorine will corrode the anode plate, shorten the life of the anode and reduce the quality of the precipitated zinc, and because of the difficulty of dechlorination, the zinc scum Has not been well handled, resulting in a waste of resources

Method used

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  • Mehtod for producing zinc concentrate and lead concentrate using zinc oxide ore and zinc slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Please refer to the attached figure 1 . Using a low-grade zinc oxide ore as raw material, the zinc grade is 13.8, the lead grade is 4.6, and the zinc is mainly smithsonite (ZnCO 3 ), Willemite (ZnSiO 4 ) form, lead as white lead ore (PbCO 3 ) and lead alum (PbSO 4 ) form, these lead-zinc components have high solubility in strong alkaline solution. After the raw material is ground to a particle size of 0.1-1mm, put 1t of raw material into 3.5-5m 3 For industrial caustic soda solution, the leaching temperature is controlled at 10-95°C, the concentration of industrial caustic soda solution is 200-400g / L, and the reaction is carried out under the condition of slow stirring at 120 rpm for 90 minutes. Since most metals cannot be dissolved in strong alkali solution, iron, manganese, copper, calcium and other metals in zinc oxide ore will precipitate in the filter residue in the form of hydroxide, and the filtrate is only zinc, lead and a small amount of aluminum . The e...

Embodiment 2

[0021] Using zinc dust from a steelmaking plant as raw material, its chemical composition is as follows:

[0022] Element

[0023]Zinc dust particle size is all less than 1mm, and within the particle size required by the present invention, no pretreatment is needed, and it is directly leached with sodium hydroxide solution: immerse 1 ton of zinc dust in 3 cubic meters of sodium hydroxide solution and feed, leaching The temperature is controlled at 10-95° C., the concentration of sodium hydroxide solution is 250 g / L, and the extraction rates of zinc and lead are both 100 percent after reacting for 100 minutes under the condition of slow stirring at 120 rpm. Filter while it is hot, wash the filter residue with water and discharge it to make bricks or landfill, and wash the water for reuse. Add precipitant in the filtrate containing zinc and lead obtained after filtering, precipitant is ammonium sulfide, the addition of precipitant is added by 2 times mass ratio of lea...

Embodiment 3

[0025] Zinc and lead concentrates are produced from Guizhou lead-zinc ore and hot-dip galvanizing plant zinc ash. The chemical composition of lead-zinc ore and zinc ash is as follows:

[0026] chemical composition

PbO

ZnO

CaO

MgO

Fe 2 o 3

K 2 o

Na 2 o

SiO 2

Al 2 o 3

MnO

TiO 2

Content %

3.46

7.63

1.78

1.24

32.30

0.78

0.024

19.43

10.21

0.20

0.61

[0027] Element

Zn

Fe

Pb

Al

Cl

Cu

Content %

55.21

1.4～2.0

2～3

0.015

20～30

0.965

[0028] Although zinc ash has a high zinc content, it is a kind of zinc waste residue that has great recovery value and is difficult to handle due to the complex impurity components, especially the high chlorine content. The lead-zinc oxide ore used in this example has low zinc content and is difficult to handle with tradit...

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Abstract

The process of producing zinc concentrate and lead concentrate with zinc oxide and zinc slag includes the following steps: grinding material to granularity of 0.1-1mm, leaching in strong alkaline solution, stirring at 10-100deg.c for 60-100 min to leach out zinc and lead from the material; filtering, water washing filter residue, and producing slag brick or land filling of filter residue; adding precipitant in 0.5-3 times the lead content, stirring for 60 min, and filtering to obtain lead concentrate; adding precipitant in the amount of 0.5-5 times zinc content, stirring at 10-100 for 1-5 hr and filtering to obtain zinc concentrate; and returning filtrate and washing water for reuse. The present invention has simple technological process, low production cost and no environmental pollution, and can utilize zinc and lead resource, especially low grade resource, effectively.

Description

technical field [0001] The invention relates to a process for producing zinc and lead concentrate by using zinc oxide slime and zinc ash, and belongs to the technical field of lead-zinc beneficiation and solid waste recycling. Background technique [0002] With the recovery of the world economy, especially the stable and rapid development of my country's economy, lead and zinc, as important raw materials and strategic materials for the national economy and people's livelihood, are in increasing demand. In 2002, the consumption of lead and zinc in the world was 6.7680 million tons and 9.0063 million tons respectively, an increase of 16% and 14% compared with 1998 respectively. The consumption of lead and zinc in my country also reached 920,800 tons and 1,676,100 tons respectively. It is estimated that the demand for lead and zinc in my country will be 850,000 tons and 1.9 million tons in 2010, and will increase to 1.1 million tons and 2.45 million t...

Claims

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Application Information

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IPC IPC(8): C22B3/12C22B3/22
CPCY02P10/20
Inventor 赵由才刘清易天晟
Owner TONGJI UNIV
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