The optimization of processes for direct smelting of lead concentrate.

Details

• Personal Author:
  Mang W
• Description:
  Emerging direct lead smelting processes offer advantages over blast furnace smelting, such as elimination of the sintering step and the need for coke, utilization of the exothermic heat of the oxidation reactions during smelting, potential use of pure oxygen, and production of a so2-rich gas. However, the new processes require additional stages, and a high-pbo slag must be produced to obtain a low-s bullion. This project aims to optimize conditions for producing low-s bullion and a throwaway slag from clean typical Missouri lead concentrate in a single reactor by combining experimental studies with computer simulations. The "submerges smelting" technique was adopted, along with calcium ferrite slags, in which lead is only one-tenth as soluble as in silicate slags. Computer simulations use stepsol, the umr version of the solgasmix program. A thermochemical model for the pb-s-o system was developed and will be adjusted to agree with experimental data for the pure system. The model will be further modified to simulate smelting results and identify process variable that optimize the single-step direct lead smelting process using a typical Missouri lead concentrate. The model will be extended to multistep or countercurrent processes such as kivcet and qsl for comparison with the optimized single-step process. [Description provided by NIOSH]
• Subjects:
  Lead Metals Metal Workers Occupational Health Oxygen Safety
• Keywords:
  Lead; Lead smelting; Oxidation; Oxygen; Sulfur dioxide; Gases; Lead compounds; Oxides; Dioxides; Computerized simulation; Smelting; Calcium compounds; Iron compounds; Thermal properties; Models; Analytical models
• Series:
  Mining Publications
• Subseries:
  Open File Report
• Document Type:
  Text
• Funding:
  Contract
• Genre:
  Conference Publications ; Final Contract Report
• Place as Subject:
  Missouri ; OSHA Region 7
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  WO - Washington Office
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  1-8
• NIOSHTIC Number:
  nn:10011139
• Citation:
  For Reference Only At Bureau Libraries, 1991; :1-8
• CAS Registry Number:
  Calcium iron oxide (CaFe2O4) (CAS RN 12013-33-1) ; Lead (CAS RN 7439-92-1) ; Oxygen (CAS RN 7782-44-7) ; Sulfur dioxide (CAS RN 7446-09-5)
• Federal Fiscal Year:
  1991
• Performing Organization:
  University of Missouri--Rolla
• Peer Reviewed:
  False
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:7dc847c09aedf140bc731323e8446b4703641ae07d6ad9e7b7238120dab30b8f7dcaa9b938d34d035f87873a0fe7fec262d5d13dcaf290925445e82b6de3b57d
• Download URL:
  https://stacks.cdc.gov/view/cdc/245523/cdc_245523_DS1.pdf
• File Type:
  [PDF - 168.02 KB ]