System for treating tin smelting intermediate materials and method for treating same

Patent metadata

Field	Value
Publication number	US-2023111491-A1
Application number	US-202217693324-A
Country	US
Kind code	A1
Filing date	Mar 12, 2022
Priority date	Oct 9, 2021
Publication date	Apr 13, 2023
Grant date	—

Abstract

A system for treating tin smelting intermediate materials and method for treating the materials is disclosed. The system includes a fuming furnace, an electric settling furnace, a lean slag water quenching pool, a matte ladle, a pulverized coal injection system, a flue gas treatment system and a secondary air supply system; the fuming furnace is connected with the electric settling furnace, the pulverized coal injection system, the flue gas treatment system and the secondary air supply system respectively; the electric settling furnace is also connected with the slag-lean water quenching pool and the matte ladle respectively. The system and method disclosed by the disclosure can efficiently classify, separate and recover tin from other materials, solve the problems of difficult sales and transportation of complex tin-containing smelting intermediate materials and economic loss of discounted sales, and transform hazardous wastes into value-added valuable materials for comprehensive recovery.

First claim

What is claimed is:

1 . A system for treating tin smelting intermediate materials, comprising: a fuming furnace, an electric settling furnace, a lean slag water quenching pool, a matte ladle, a pulverized coal injection system, a flue gas treatment system and a secondary air supply system;
the fuming furnace is connected with the electric settling furnace, the pulverized coal injection system, the flue gas treatment system and the secondary air supply system respectively; the electric settling furnace is also connected with the slag-lean water quenching pool and the matte ladle respectively.

2 . The system of claim 1 , further comprising: a top furnace belt feeding system and a hook scale system;
wherein the tin smelting intermediate material comprises a hot tin slag, a tin-containing copper ore material and a lump coal; the hot tin slag is fed into the fuming furnace through the hook scale system, and the tin-containing copper ore materials and the lump coal are fed into the fuming furnace through the furnace top belt feeding system.

3 . The system of claim 2 , wherein the fuming furnace is provided with a hot tin slag feed chute, a furnace top feed inlet and a high-temperature melt chute;
the electric settling furnace is provided with a matte discharge chute and a lean slag discharge chute; the hook scale system works in cooperation with the hot tin slag feeding chute; the furnace top belt feeding system works in cooperation with the furnace top feeding port; the high-temperature melt chute is communicated with a molten pool in the electric settling furnace; the matte discharge chute is communicated with the interior of the matte ladle; the lean slag discharge chute is communicated with the interior of the slag-lean water quenching pool.

4 . The system of claim 2 , wherein the flue gas treatment system comprises a dust collector, a tin electric furnace, a vacuum furnace, a top-blown furnace, a vacuum tin chute, a vacuum tin mold, an antimony-bismuth alloy chute, an antimony-bismuth alloy mold and a high antimony-bismuth crude tin chute;
the dust collector device is respectively communicated with the tin electric furnace and the top-blown furnace; the tin electric furnace is also communicated with the vacuum furnace through the high antimony-bismuth coarse tin chute; the vacuum tin mold is arranged at the end of the vacuum tin chute and used for receiving a vacuum tin; the antimony-bismuth alloy mold is arranged at the end of the antimony-bismuth alloy chute and used for receiving an antimony-bismuth alloy; the top-blown furnace is provided with a top-blown slag port and a top-blown furnace coarse tin port; the hot tin slag transfer slag ladle is arranged under the top-blown slag port and used for receiving hot tin slag.

5 . The method of claim 4 , comprising:
(a) Preparation of fuming furnace materials: before the fuming furnace is ready for feeding, keeping the temperature of flue gas in the furnace at 600 ~ 800° C.; (b) Receiving hot tin slag: lifting the hot tin slag transfer ladle through the hook scale system, introducing the hot tin slag into the fuming furnace through the hot tin slag feeding chute, and weighing and measuring the weight of the hot tin slag by the hook scale system; (c) Top belt feeding: after the hot tin slag in the fuming furnace is received, starting the top furnace belt feeding system, adding a tin-bearing copper ore and a lump coal into the fuming furnace, and finishing the feeding uniformly within 60~120 min; (d) Heat up smelting: after the feeding of the belt system at the furnace top belt feeding system is finished, stopping the belt feeding system at the top of fuming furnace, increasing the oxygen-enriched concentration of the secondary air supply system and the amount of pulverized coal supplied by the pulverized coal injection system, accelerating the heating and melting of cold materials in fuming furnace, keeping the temperature of furnace flue gas at 1050-1150° C., controlling the Fe/SiO2 ratio of the fuming furnace melting pool to 1.0 ∼ 1.4, and keeping the temperature for 30 ∼ 60 min; (e) Fumigation and volatilization of tin: after heating, smelting and heat preservation until the cold material in the fuming furnace is completely melted, inserting the sample rod into the melting pool inside the fuming furnace to take the melt sample for rapid elemental analysis, and starting the step of sulfurizing the volatile melt tin in the fuming furnace according to the results of rapid elemental analysis, adding a vulcanizing agent into the fuming furnace to volatilize tin through the top belt feeding system, turning off an oxygen enrichment of the secondary air supply system synchronously, wherein the addition amount of the vulcanizing agent is calculated in accordance with the S / (Sn + Cu) molar ratio of 1: 3 and the surplus coefficient is 1.2∼1.3, and the addition of vulcanizing agent is completed within 90 ∼ 120 min, taking a sample for analysis, the tin is volatilized when the tin content in the high-temperature melt in the fuming furnace is less than or equal to 0.3 wt.%. (f) Separation of copper and lean slag in the electric settling furnace: when the electric settling furnace initially expects materials, using the slag with Fe/SiO2 ratio of 0.9-1.3 in the molten pool, and keeping the temperature of the molten pool in the electric settling furnace at 1200 ∼ 1230° C.; discharging the high-temperature melt of the fuming furnace after the fuming and volatilizing tin reaches the standard into the electric settling furnace through a high-temperature melt chute in the step (e), keeping the electric settling furnace continuously heat until the copper content of the upper lean slag is less than or equal to 0.7 wt.%, then, burning the matte port at the low part of the sedimentation electric furnace firstly, discharging a matte in the electric settling furnace to matte ladle through matte discharge chute, and immediately plugging the matte outlet to stop matte discharge when the matte outlet has poor slag; discharging the lean slag in the electric settling furnace into the lean slag water quenching pool through the lean slag discharge chute at the upper part of the electric settling furnace for water quenching, the lean slag after water quenching can be sold out after slag-water separation; in the discharge of lean slag, using the sample rod to detect the depth of the molten bath in the electric settle furnace at all times, if the lean slag remains 300 - 500 mm in the molten pool, blocking the outlet of the lean slag , stopping the discharge of the lean slag , and using the remaining lean slag for heat preservation of the electric settling furnace so as to receive the high-temperature melt of the next furnace of the fuming furnace.

6 . The method of claim 5 , wherein in the step (c), the components of the tin-containing copper ore material added into the fuming furnace are Sn 0-65 wt.%, Cu 0-24 wt.%, S 0-30 wt.%, Sb 0-20 wt.%, Bi 0-20 wt.%, As 0-7 wt.%, Au 0–30 g/t and Ag 0~800 g/t, the tin-containing copper ore material is one or more of a tin-containing ore material, a copper-containing tin material and a high-sulfur copper concentrate; the main elements in the hot tin slag are Sn 2-6 wt.%, Fe 18-25 wt.% and Si 13-25 wt.%.

7 . The method of claim 6 , wherein the proportioning is performed according to the weight ratio of hot tin slag: tin-containing material: copper-containing tin material and high-sulfur copper concentrate of (30-70): (0-35): (0-20): (0-30), and the principle of proportioning is that the grade of Sn contained in the mixture is 3 ~ 10 wt.%, and the grade of Cu is not required to be controlled.

8 . The method of claim 5 , wherein the mass of the lump coal accounts for 3-5% of the tin smel

Assignees

• Univ Kunming Science & Technology
• Yunnan Tin Co Ltd Tin Branch

Inventors

• Yuan Haibin
• Tang Duzuo
• Yang Bin
• Xu Wanli
• Song Xingcheng
• Xie Yunhua
• Zhang Zhang
• Zhang Zhiyin
• Guo Xiangyong
• Liang Jun
• Chen Yun
• Jia Hongwu
• Zhang Yumei

Classifications

• F27D17/302

  Constructional details of ancillary components, e.g. waste gas conduits or seals · CPC title

• F27D17/20

  Arrangements for treatment or cleaning of waste gases · CPC title

• F27D2007/066

  Vacuum · CPC title

• F27D2003/0034

  Means for moving, conveying, transporting the charge in the furnace or in the charging facilities · CPC title

• F27D7/06 Primary

  Forming or maintaining special atmospheres or vacuum within heating chambers (supplying steam, vapour, gases or liquids F27D7/02) · CPC title