Chlorination-extraction process of gold in arsenic-containing sulphuric acid slag and comprehensive utilization method of gas heat

A technology of sulfuric acid slag and flue gas, which is applied in the direction of improving process efficiency to achieve the effects of no waste water, reduced system energy consumption, and solving pipeline blockage.

Active Publication Date: 2016-11-09
CHENZHOU YANGTAO CHEM
View PDF3 Cites 14 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In order to solve the difficulties faced by the existing chlorination gold extraction process in the process of processing arsenic-containing sulfuric acid slag, the present inven

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
  • Chlorination-extraction process of gold in arsenic-containing sulphuric acid slag and comprehensive utilization method of gas heat
  • Chlorination-extraction process of gold in arsenic-containing sulphuric acid slag and comprehensive utilization method of gas heat

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0038] Example 1

[0039] A process for chlorinating gold extraction from arsenic-containing sulfuric acid cinder and a method for comprehensive utilization of flue gas heat, the specific steps are as follows:

[0040] The composition of sulfuric acid slag before treatment:

[0041] ingredient

[0042] Step (1) Acid leaching, sulfide precipitation:

[0043] Sulfuric acid burning residue 14.6t / h is acid leached in an acid leaching tank, stirred and leached for 2 hours, and filtered through a vacuum belt filter press to obtain filtrate A and filter residue A; add an appropriate amount of solution to filtrate A with a concentration of 11g / Sodium sulfide solution of L to achieve sulfide precipitation of arsenic, press filter press to obtain filtrate B and arsenic-containing slag; add appropriate amount of lime to filtrate B for neutralization, after neutralization, press filter press to obtain neutralization With residue and filtrate, the filtrate is returned to the acid leaching tan...

Example Embodiment

[0056] Example 2

[0057] A process for chlorinating gold extraction from arsenic-containing sulfuric acid cinder and a method for comprehensive utilization of flue gas heat, the specific steps are as follows:

[0058] The composition of sulfuric acid slag before treatment:

[0059] ingredient

[0060] Step (1) Acid leaching, sulfide precipitation:

[0061] Sulfuric acid burning residue 12t / h is acid leached in an acid leaching tank, stirred and leached for 2 hours, and then filtered through a vacuum belt filter to obtain filtrate A and filter residue A; add an appropriate amount of solution to filtrate A with a concentration of 15g / L Sodium sulfide solution to achieve sulfide precipitation of arsenic, press filter press to obtain filtrate B and arsenic-containing residue; add appropriate amount of lime to filtrate B for neutralization, after neutralization, press filter press to obtain neutralized residue And filtrate, the filtrate is returned to the acid leaching tank as washing...

Example Embodiment

[0073] Example 3

[0074] A process for chlorinating gold extraction from arsenic-containing sulfuric acid cinder and a method for comprehensive utilization of flue gas heat, the specific steps are as follows:

[0075] The composition of sulfuric acid slag before treatment:

[0076] ingredient

[0077] Step (1) Acid leaching, sulfide precipitation:

[0078] Sulfuric acid burning residue 15.8t / h is acid leached in the acid leaching tank, stirred and leached for 2 hours, and then vacuum pressure filtered by a vacuum belt filter press to obtain filtrate A and filter residue A; add an appropriate amount of solution to filtrate A with a concentration of 10g / L sodium sulfide solution to achieve sulfide precipitation of arsenic, filter press to obtain filtrate B and arsenic-containing slag; add appropriate amount of lime to filtrate B for neutralization, after neutralization, press filter with filter press to obtain neutralization Residue and filtrate, the filtrate is returned to the ac...

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 relates to a method for chlorinating and extracting gold in arsenic-containing sulphuric acid slag and comprehensively utilizing gas heat. The method comprises the following specific steps of (1) acid leaching and arsenic sulfide precipitation; (2) drying, wet-grinding, pelletizing, drying and chloridizing volatilization; (3) primary quench cooling, heat exchanging, secondary quenching and electrostatic precipitation; and (4) dust scrubbing, chloride leaching of gold, gold reducing, silver extraction by ammonia leaching and silver reducing. An acid leaching and arsenic precipitation technology is adopted, and arsenic is first separated from raw materials, so that the influence of arsenic on a follow-up system is eliminated. The arsenic sulfide precipitation technology realizes enrichment of arsenic in water and recycling of water. The primary quench cooling technology is adopted, so that the temperature of dust-laden gas is higher than that of a softening point of dust, and relatively high liquidity is obtained. An iron powder replacement technology is adopted, so that gold and silver enriched in recycling process water are recycled. Lead and zinc in the process water are recycled through alkaline lead and zinc precipitation, so that the problem that a pipeline is blocked with soluble salt is solved.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of solid waste, and in particular relates to a process for extracting gold by chlorination of arsenic-containing sulfuric acid slag and a method for comprehensive utilization of flue gas heat. Background technique [0002] Sulfuric acid slag is the waste residue produced during the production of sulfuric acid by roasting pyrite in the sulfuric acid plant. The main component is iron oxide, and it also contains valuable metals such as gold and silver. In order to recover valuable metals such as gold and silver, the production process of chlorination and roasting is often used at present, which can realize the comprehensive utilization of arsenic-free or low-arsenic slag. [0003] In recent years, with the continuous consumption of resources, high-quality sulfuric acid slag is increasingly scarce. In the past, the arsenic content of sulfuric acid slag was usually 0.05%-0.15%, but now the arse...

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
IPC IPC(8): C22B7/04C22B11/06C22B1/11C22B19/30C22B19/20C22B13/00
CPCC22B1/11C22B7/007C22B7/04C22B11/023C22B11/06C22B13/045C22B19/20C22B19/30Y02P10/20
Inventor 周德华林平平王云周永斌李金懋刘伟涛
Owner CHENZHOU YANGTAO CHEM
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