Lead Smelting Slag Glass-Ceramics via Silicon Oxidation
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Solution Overview
Problem
The challenge is to control the oxidation degree of elemental silicon in silicon-rich silicon slag during the preparation of glass-ceramics, leading to structural heterogeneity and performance deterioration in the resulting products.
Innovation Solution
A method involving pre-oxidation and tempering of silicon-rich silicon slag, mixed with hot lead slag, using specific ratios of oxidants, fluxes, and clarifiers to achieve controlled oxidation and form glass-ceramics with uniform crystalline phases, including magnetite and hematite, and secondary phases like albite and anorthosite.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional melting systems and water quenching operations are used to process silicon-rich slag, then the processing is simple, but it is difficult to obtain homogeneous glass frit and elemental silicon is easily retained causing negative impact on glass-ceramic structure and performance
Solution Approach 1:
The patent applies preliminary action by performing oxidation treatment of silicon-rich slag before the main melting process. The slag is pre-oxidized at 600-900°C for 1-3 hours to convert elemental silicon into oxidized forms, eliminating the harmful effects of retained silicon before glass frit formation. This preliminary oxidation step ensures homogeneous glass frit without requiring complex melting systems.
2Manufacturing precision
If oxidation treatment of silicon-rich silicon slag is performed, then the oxidation degree can be controlled, but it is difficult to control the oxidation degree of elemental silicon in silicon slag
Solution Approach 1:
The patent applies parameter changes by systematically varying oxidation temperature (600-900°C), time (1-3 hours), and atmosphere (air or oxygen) to achieve precise control over the oxidation degree of elemental silicon. These parameter adjustments allow the oxidation process to be easily controlled without complex equipment, converting silicon to desired oxidized forms for homogeneous glass frit formation.
3Productivity
If elemental silicon is retained in water quenching slag materials, then the quenching process is simple, but the residue of elemental silicon has great negative impact on the structure and performance of glass-ceramics
Solution Approach 1:
The patent eliminates the harmful effect of retained elemental silicon by performing preliminary oxidation treatment before quenching. The slag is oxidized at 600-900°C to convert elemental silicon into stable oxidized forms, ensuring that even with simple water quenching, the resulting glass frit is homogeneous and free from the negative impacts of unoxidized silicon residues.
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 enhances the flexibility and adjustability of oxidation, utilizes high silicon content, reduces environmental load, and produces glass-ceramics with improved mechanical and chemical properties, such as high flexural strength and resistance to acids and alkalis.
Implementation Method 1
A method involving pre-oxidation and tempering of silicon-rich silicon slag, mixed with hot lead slag, using specific ratios of oxidants, fluxes, and clarifiers to achieve controlled oxidation
Data Source
AI summary
The invention discloses a method for preparing lead smelting slag glass-ceramics based on the oxidation of silicon-rich silicon smelting slag and composition adjustment, and belongs to the technical field of resource utilization of smelting slag rich in monatomic silicon. The method comprises the steps: mixing the silicon slag rich in monatomic silicon with an oxidant, a fluxing agent and a clarifying agent according to a formula ratio, ball-milling and screening to obtain a tempering raw material with uniform size, and performing high-temperature oxidation melting on the tempering raw material to form an oxidation-state molten tempering material; and carrying out further mixed melting on the molten tempering material and hot lead slag, carrying out water quenching to obtain basic glass, and carrying out heat treatment system on the obtained basic glass to form the glass ceramics. According to the method, the smelting slag rich in monatomic silicon is subjected to oxidation tempering and mixed melting with the hot lead slag to prepare the basic glass, and the glass ceramics are obtained by regulating and controlling the heat treatment system of the basic glass. The method is simple in technological process, high in production efficiency and low in cost, achieves the collaborative high-value conversion target of the silicon-rich silicon slag and the lead slag, and is easy to industrially popularize and apply.