Method for recovering sulfur from atmospheric-pressure oxygen-rich leached residues of lead-zinc ores

An oxygen-enriched leaching, lead-zinc ore technology, applied in the field of resources and environment, can solve the problem of low sulfur purity, achieve the effects of high recovery rate and product quality, good environment and economic benefits, and simple process and equipment

Inactive Publication Date: 2012-08-15
CENT SOUTH UNIV
View PDF4 Cites 15 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the metal sulfide is melted in the sulfur, so that the purity of the sulfur is not high
The above sulfur extraction methods all have certain technical defects. With the wide application of the atmospheric pressure oxygen-enriched leaching process in the lead-zinc smelting industry, the development of new sulfur extraction methods that can overcome the above technical defects will help eliminate the large amount of leaching slag stockpiling Environmental hazards, while realizing the recycling of waste

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for recovering sulfur from atmospheric-pressure oxygen-rich leached residues of lead-zinc ores
  • Method for recovering sulfur from atmospheric-pressure oxygen-rich leached residues of lead-zinc ores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Take 3g of the oxygen-enriched leaching slag sample of zinc concentrate at atmospheric pressure with a sulfur content of 58.00% and a particle size below 100 mesh after drying, grinding, and screening, and put it into a horizontal vacuum distillation device, seal it, and evacuate it to 3000Pa About, heat to 200°C, keep the temperature constant, the sulfur vapor is extracted and condensed after the distillation device, after 30 minutes of distillation, cool down the reaction system to below 100°C, feed nitrogen into the distillation device, open the distillation device, and obtain Sulfur and metal residues. After calculation, the recovery rate of sulfur can reach 92.35%, and the product purity is 97.80%. The XRD patterns before and after distillation are as follows: figure 1 It can be seen from the figure that almost all the elemental sulfur in the slag after treatment is distilled out.

Embodiment 2

[0026] Take 10g of zinc concentrate atmospheric pressure oxygen-enriched leaching slag samples with a sulfur content of 18.60% and a particle size below 100 mesh after drying, grinding, and sieving, and put them into a horizontal vacuum distillation device, seal, and evacuate to 600Pa About, heat to 400°C, keep the temperature constant, the sulfur vapor is extracted and condensed after the distillation device, after 30 minutes of distillation, cool down the reaction system to below 100°C, feed nitrogen into the distillation device, open the distillation device, and obtain Sulfur and metal residues. After calculation, the recovery rate of sulfur can reach 91.04%, and the product purity is 95.12%.

Embodiment 3

[0028] Put 1 ton of zinc concentrate atmospheric pressure oxygen-enriched leaching slag with a sulfur content of 58.00% and a particle size below 100 mesh after drying, grinding, and screening into a horizontal continuous sulfur slag vacuum distillation industrial furnace, and vacuumize to 10,000Pa Around, heating to 300°C, keeping the temperature constant, the sulfur vapor is drawn out and condensed after the distillation device, after 120 minutes of distillation, the metal residue is discharged, re-feeding, and the next round of distillation process starts. The obtained sulfur and metal residues are collected, weighed and calculated to obtain a sulfur recovery rate of 90.57% and a product purity of 95.80%. Each cycle consumes about 400-1000 degrees of electricity, and no waste water, waste gas and other pollutants are produced.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a method for recovering sulfur from atmospheric-pressure oxygen-rich leached residues of lead-zinc ores, and particularly relates to the recovery of sulfur in lead-zinc ore leached residues through vacuum distillation, belonging to the field of reclamation and reuse of solid waste resources. The method comprises the following steps of: placing atmospheric-pressure oxygen-rich leached residues, subjected to drying, milling and screening pretreatment, of lead-zinc ores into a vacuum distillation furnace, heating the residues to 200-400 DEG C, and controlling the pressure of the inside of the furnace to 600-10000 Pa, so that sulfur in the leached residues is sublimated and volatilized; pumping sulfur-containing vapor out of the distillation furnace by a vacuum pump; and cooling the sulfur-containing vapor so as to obtain a sulfur product. After the distillation is completed and the sulfur is completely volatilized, high-boiling-point residues are discharged out of the distillation furnace in a solid powder form. In the whole process, the furnace is internally sealed, thereby avoiding the oxidation and environmental pollution of elemental sulfur. The method is simple in technological process and equipment, high in sulfur recovery rate and product quality, low in energy consumption, strong in adaptability to raw materials and pollution-free, so that the method disclosed by the invention is an economic and efficient sulfur extraction method and can realize the zero discharge of waste smelting residues in a lead-zinc wet process, thus the method has broad application prospects.

Description

technical field [0001] The invention discloses a method for recovering sulfur from the normal-pressure oxygen-enriched leaching slag of a lead-zinc ore, and in particular relates to resource utilization of the leaching slag produced in the lead-zinc hydrometallurgy process. It belongs to the field of resources and environment. Background technique [0002] Sulfur is widely used in agriculture, chemical industry, light industry, building materials, medicine and other industries and has high value. There are very few natural sulfur mines in our country, and due to technical and economic reasons, there is almost no mining. At present, domestically produced sulfur mainly comes from sulfur recovered from crude oil, coal, and natural gas, and it is difficult to meet its huge demand in various industries. my country's resource characteristics and technological status quo determine that the imbalance between supply and demand of sulfur resources in my country will be difficult to ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/027C22B7/04
CPCY02P10/20Y02P20/129
Inventor 李立清李海龙刘峥马卫武
Owner CENT SOUTH UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap