Flue Dust Arsenic Removal via Carbon Reduction
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Solution Overview
Problem
Pyrometallurgical methods for processing nonferrous metals result in flue dusts with high arsenic and antimony content, which are difficult to recycle due to equilibrium reactions, leading to impurity enrichment in the slag phase, making slag disposal or reuse as hazardous waste necessary.
Innovation Solution
A method involving the addition of a carbonaceous reducing agent to flue dusts, heated in a fluidized bed to separate volatile components, with granulation and binder use to ensure stable particle size and efficient mass transport, allowing for high recovery of valuable metals while removing arsenic and antimony without contaminating the slag.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If flue dusts containing arsenic and antimony are recycled to the smelter, then process efficiency increases, but impurities enrich in the slag phase making disposal necessary
Solution Approach 1:
The patent applies preliminary action by treating the flue dusts with a reducing agent before smelting to convert arsenic and antimony into volatile forms that can be removed as gas. This pre-treatment prevents the impurities from entering the smelting process and enriching the slag, thereby maintaining both high process efficiency and clean slag suitable for road construction
2Object-affected harmful factors
If flue dusts are treated at high temperature to remove arsenic and antimony, then impurity removal improves, but energy consumption increases
Solution Approach 1:
The patent optimizes the temperature parameter to a specific range (500-1000°C) that is sufficient to volatilize arsenic and antimony compounds but not excessively high. This parameter optimization achieves effective impurity removal while minimizing energy consumption, resolving the contradiction between removal efficiency and energy use
3Object-affected harmful factors
If reducing agent is added to flue dusts, then arsenic and antimony removal improves, but process complexity increases
Solution Approach 1:
The patent introduces a reducing agent as an intermediary substance that facilitates the conversion of arsenic and antimony into volatile forms. This intermediary enables effective impurity removal through a relatively simple process of adding the reducing agent, heating, and gas separation, avoiding the need for complex treatment systems
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method effectively removes arsenic and antimony from flue dusts, enabling the recovery of valuable metals like copper and ensuring the slag is suitable for road construction, thereby increasing process efficiency and reducing hazardous waste.
Implementation Method 1
a reducing agent is added to the flue dusts, the flue dusts are heated together with the reducing agent
Implementation Method 2
the flue dusts are heated together with the reducing agent, and volatile components are separated
Implementation Method 3
heated in a fluidized bed to separate volatile components
Data Source
AI summary
A method for the treatment of flue dusts containing arsenic and/or antimony from pyrometallurgical methods, wherein a reducing agent is added to the flue dusts, the flue dusts are heated together with the reducing agent, and volatile components are separated from a slag. The reducing agent is a carbonaceous compound.