CN104278155A - Method for smelting lead from waste CRT lead-containing glass - Google Patents

Abstract

Smelting lead from waste CRT leaded glass. The invention belongs to the field of resource regeneration and environmental protection, and is the pollution-free treatment of waste. Smelting lead from waste CRT lead-containing glass. While realizing resource regeneration and recycling, reduce the development of mines and avoid the pollution of the environment by waste CRT lead-containing glass. The impact of lead on the treatment and disposal of waste CRT glass is first reflected in the potential environmental hazards (such as lead under the action of environmental media The toxic and harmful effects of leaching on soil, water, atmosphere and organisms, etc.), is also reflected in the comprehensive utilization of non-ferrous metal resources. The invention utilizes waste CRT lead-containing glass, cleans it, and adds some, such as quartz sand, coke, fluorite, etc., through high-temperature smelting, reduces the lead oxide in the glass to metallic lead, and uses the separated glass as a building material The raw material of glass not only realizes the pollution-free treatment of harmful substances, but also has considerable economic benefits. This technology is suitable for the pollution-free treatment of waste CRT lead-containing glass.

Description

Smelting Lead from Waste CRT Leaded Glass

technical field

The invention belongs to the technical field of circular economy, in particular to smelting lead from waste CRT lead-containing glass. Smelting lead from waste CRT lead-containing glass. While realizing resource regeneration and recycling, reduce the development of mines and avoid the environmental pollution of waste CRT lead-containing glass. The impact of lead on the treatment and disposal of waste CRT glass is first reflected in the potential environmental hazards (such as lead under the action of environmental media) The toxic and harmful effect of leaching on soil, water, atmosphere and organisms, etc.), is also reflected in the comprehensive utilization of non-ferrous metal resources. The invention utilizes waste CRT lead-containing glass, cleans it, adds some, such as quartz sand, coke, fluorite, etc., and separates the lead oxide in the glass through high-temperature smelting.

Background technique

In recent years, the theoretical elimination of waste home appliances in my country will reach 35 million TV sets, 20 million computers and 10 million mobile phones each year. Most of these wastes are harmful to the environment. The content of the glass cone and the glass neck of the waste CRT glass is equivalent (about 24%), and the utilization of a large amount of lead is a major problem. In the past, waste CRT lead-containing glass was transported to enterprises that produce CRT glass to achieve "closed-loop" production, which not only reduces production costs, but also protects the environment. But now the demand for CRT glass bulbs in the domestic and foreign markets is further reduced, and most of the glass bulb factories have been closed one after another. The "closed-loop" treatment of waste CRT glass is bound to lose the possibility, and people will have to mainly adopt the "open-loop" method, how to deal with it Waste CRT lead glass is a major problem at present. The invention mainly refers to the harmless treatment of the leaded cone and the glass tube neck of the discarded CRT. Add quartz sand, fluorite, and coke to the waste CRT leaded glass to reduce the lead oxide in the leaded glass. The remaining glass is used as the raw material for manufacturing architectural glass to realize the pollution-free treatment of leaded glass.

Contents of the invention

1. The purpose of the invention: the present invention is a pollution-free treatment of waste CRT lead-containing glass, smelting lead from the glass containing lead oxide, and the remaining by-products can be used as raw materials for building material glass. To achieve the recycling of waste CRT lead glass resources, and to protect the environment.

2. Detailed description of the present invention: clean and dry the waste CRT lead-containing glass, break it into a particle size of 0.01-0.02mm, mix it with quartz sand, fluorite, and coke in a certain proportion, and put it into a sagger Internal smelting, the smelting temperature is controlled at 1380-1400°C. Separating the smelted lower layer material to obtain lead, and the upper layer material can be used as raw material for producing building material glass. The composition of raw materials is: waste CRT leaded glass powder 70-80%, coke 4-10%, quartz sand 28-15%, fluorite 2-4%, mix well. The process is: waste CRT lead-containing glass cleaning → drying → crushing → batching → uniform mixing → smelting → separation

The smelting temperature is 1380-1400°C.

Application: The present invention utilizes waste CRT lead-containing glass to recycle resources.

3. Beneficial effects: the invention uses waste CRT lead-containing glass to smelt lead, so that lead-containing glass can realize resource regeneration, which not only protects the environment, but also realizes the recycling of waste and harmful materials, which has social benefits (environment protection), and realize the resource regeneration of harmful materials.

Detailed ways

Clean the discarded CRT lead-containing glass, add some minerals such as quartz sand, fluorite, coke, mix evenly, put it into a sagger for reduction smelting, separate the smelted materials to obtain metal lead, and the remaining glass is used as raw material for building glass. The cullet particle size is controlled at 0.01-0.02mm, mixed with other raw materials, put into a ceramic sagger, sent into a kiln, heated to 1380-1400°C, kept for 30-35 minutes, after cooling, the smelted materials are separated, Lead can be extracted and smelted from waste CRT glass.

Claims (6)

1. Smelting lead from waste CRT leaded glass, including the following steps: The main raw material is waste leaded glass, which is crushed to 0.01-0.02mm. The crushed cullet, coke, quartz sand, and fluorite are mixed evenly according to a certain ratio, and the lead oxide in the glass is reduced by high temperature, and then Through the separator, the lead with high specific gravity is separated. 2. (1) Clean, crush, and sieve the discarded CRT glass, and control the particle size at 0.01-0.02mm; (2) Mix glass powder, coke, and quartz sand in the following proportions: glass powder 70-80%, coke 4-10%, 28-15% quartz sand, 2-4% fluorite and mix evenly; (3) Put it in the sagger, pass through 1360-1380 ℃ high temperature, keep warm for 40 minutes; (4) put the lower layer in the sagger The material is taken out, separated, and lead is smelted. 3. According to claim 1, it is characterized in that: waste lead-containing glass refers to waste CRT lead-containing glass, and the cleaning of CRT glass is related to the purity of the smelted lead, and must be cleaned to obtain high-purity lead. 4. According to claim 1, it is characterized in that: the sagger is a double-layer saggar, the first layer has a funnel-shaped bottom, and the bottom has a small hole of 0.5-1mm, and the smelted lead leaks from the small hole. The lower layer; the smelting temperature is 1370-1400. 5. according to claim 1, basic technological process is: Leaded glass→crushing→batching→mixing→smelting→feeding→separation Lead glass is the remaining part of the glass after extracting the lead, which is used to make decorative glass for building materials. 6. according to claim 1, the lead extracted is a kind of heavy gold element and has a wide range of uses.