Unlock instant, AI-driven research and patent intelligence for your innovation.

Method and device for zinc oxide smoke dust dechlorinating by water vapor activating/microwave roasting

A technology of water vapor activation and microwave roasting, which is applied in the field of hydrometallurgy, can solve problems such as insurmountable failures, processing constraints, and long processing processes, and achieve the effects of high degree of automation, mature and reliable equipment, and high electrolysis utilization rate

Active Publication Date: 2013-09-25
KUNMING UNIV OF SCI & TECH
View PDF4 Cites 5 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Zinc oxide dust is an important zinc secondary resource. It mainly includes zinc oxide dust produced by the reduction and volatilization of zinc leaching slag from hydrometallurgy through rotary kiln, zinc oxide dust obtained from lead smelting furnace slag through fuming furnace smelting process, and brass smelting slag. Zinc oxide fumes, by-products recovered from the smelting system of copper processing plants, electric arc furnace fumes produced during the recycling process of galvanized iron and steel scraps, and zinc oxide fumes, blast furnace gas ash or gas mud obtained by reduction roasting in rotary kilns are treated in Webster furnaces There are many kinds of secondary zinc oxide powder produced. These zinc oxide dusts contain 40-60% zinc, 10-20% lead, and a small amount of cadmium. Each ton of zinc oxide dust contains 600-1000g of indium, which has a certain To develop value and profit margins, many zinc smelting enterprises use zinc oxide fumes as raw materials to produce electric zinc and recycle valuable metals. However, in the production process, these enterprises have encountered the same problem without exception: The failure caused by excessive chloride ions is difficult to overcome
As far as its processing characteristics are concerned, this type of processing method has the disadvantages of high processing cost, high energy consumption, and long processing process.
The ubiquitous deficiencies of these removal technologies have brought restrictive problems to the treatment of subsequent processes

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
  • Method and device for zinc oxide smoke dust dechlorinating by water vapor activating/microwave roasting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0021] Embodiment 1: the method for steam activation / microwave roasting zinc oxide soot dechlorination of this embodiment is: zinc oxide soot powder (the composition of zinc oxide soot powder is zinc oxide 60wt%, lead 15wt%, iron 5wt%, three Diindium oxide 0.1wt%, chlorine 0.9wt%, and the rest are impurities; the particle size is 2-4μm) placed under microwave airtight conditions for roasting (frequency 2400MHz, output power 2kW / kg), blown into Air and water vapor are introduced (the air flow rate per kilogram of zinc oxide dust powder is 500L / h, and the flow rate of water vapor is 27mL / min). Stir under high temperature, and discharge the generated gas, keep the temperature rise rate at 65°C / min, wait for the temperature of the zinc oxide soot powder to rise to 650°C, keep it warm for 180min, and obtain the dechlorinated zinc oxide soot powder after natural cooling.

[0022] The water vapor activation / microwave roasting zinc oxide dust dechlorination device of the present embod...

Embodiment approach 2

[0024] Embodiment two: the method for the water vapor activation / microwave roasting zinc oxide soot dechlorination of the present embodiment is: zinc oxide soot powder (the composition of zinc oxide soot powder is zinc oxide 80wt%, lead 13wt%, iron 1wt%, scattered 0.05wt% semi-raw metal indium, 0.1wt% chlorine, and the rest are impurities; the particle size is 0.5-3μm) placed in microwave airtight conditions for roasting (frequency 2500MHz, output power 1kW / kg), blown into Air and water vapor are introduced (the air flow rate per kilogram of zinc oxide dust powder is 500L / h, and the flow rate of water vapor is 1mL / min). Stir under low temperature, and discharge the generated gas, keep the temperature rise rate at 100°C / min, wait for the temperature of the zinc oxide soot powder to rise to 500°C, keep it warm for 20min, and obtain the dechlorinated zinc oxide soot powder after natural cooling. The removal rate of chlorine is 93.41wt%, and its chlorine content is far less than t...

Embodiment approach 3

[0026] Embodiment three: the method of steam activation / microwave roasting zinc oxide soot dechlorination of the present embodiment is: the zinc oxide soot powder (the composition of zinc oxide soot powder is zinc oxide 70wt%, lead 10wt%, iron 3wt%, scattered 0.2wt% semi-raw metal indium, 0.8wt% chlorine, and the rest are impurities; the particle size is 0.5-4μm) placed in microwave airtight conditions for roasting (frequency 2450MHz, output power 0.1kW / kg), drumming under normal pressure conditions Inject air and water vapor (the air flow rate per kilogram of zinc oxide soot powder is 1500L / h, and the flow rate of water vapor is 150mL / min). Stir under certain conditions, and discharge the generated gas. The temperature rise rate is maintained at 1°C / min. When the temperature of the zinc oxide soot powder rises to 750°C, keep it warm for 120 minutes. After natural cooling, the dechlorinated zinc oxide soot powder is obtained. , the removal rate is 95.72wt%, and its chlorine co...

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 and device for zinc oxide smoke dust dechlorinating by water vapor activating / microwave roasting, belonging to the technical field of wet metallurgy. The method comprises the following steps: roasting zinc oxide smoke dust powder under a microwave sealed condition, blowing air at normal pressure and introducing water vapor, exhausting the generated gas, preserving heat for 20-180 minutes when the zinc oxide smoke dust powder is heated up to 500-750 DEG C, and naturally cooling to obtain dechlorinated zinc oxide smoke dust powder, wherein the dechlorination rate is larger than 93wt%. The device comprises a sealed microwave reaction device and a gas suction and purification device, wherein the gas suction and purification device is sequentially communicated a dust absorption bottle, a gas washing bottle, a buffer bottle and a miniature sucking pump through a duct, the microwave reaction device is communicated with the dust absorption bottle through a duct and is provided with water vapor and air inlets to effectively and economically remove the chlorine in the zinc oxide smoke dust, and the treated zinc oxide smoke dust can be directly leached out by wet processing to reduce the effect of chloride impurity on the production process of electrolytic zinc and increase the recovery rate of secondary resources.

Description

technical field [0001] The invention relates to a water vapor activation / microwave roasting zinc oxide fume dechlorination method and device, belonging to the technical field of wet smelting. Background technique [0002] Zinc oxide dust is an important zinc secondary resource. It mainly includes zinc oxide dust produced by the reduction and volatilization of zinc leaching slag from hydrometallurgy through rotary kiln, zinc oxide dust obtained from lead smelting furnace slag through fuming furnace smelting process, and brass smelting slag. Zinc oxide fumes, by-products recovered from the smelting system of copper processing plants, electric arc furnace fumes produced during the recycling process of galvanized iron and steel scraps, and zinc oxide fumes, blast furnace gas ash or gas mud obtained by reduction roasting in rotary kilns are treated in Webster furnaces There are many kinds of secondary zinc oxide powder produced. These zinc oxide dusts contain 40-60% zinc, 10-20% ...

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): C22B7/02C22B1/02C01G9/02
CPCY02P10/20
Inventor 张利波马爱元彭金辉夏洪应李静左勇刚李志强
Owner KUNMING UNIV OF SCI & TECH