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A method for directly smelting oxide materials by cold pressing

A cold-pressing and material technology, which is applied in the field of direct smelting of oxide material cold-pressed agglomerates, can solve the problems of long process, poor working environment and high energy consumption, and achieve the effects of expanding raw material structure, improving metal recovery rate and improving economic benefits.

Active Publication Date: 2019-04-12
BAIYIN NONFERROUS GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a direct smelting method of oxide material cold-pressed mass to solve the problems of long process flow, high energy consumption and poor working environment in the existing method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: (this embodiment is the best embodiment)

[0027] A method for directly smelting oxide materials by cold pressing, comprising the steps of:

[0028] Step 1. Mix the ingredients and cold press them into a ball:

[0029] Mix the material, composite binder and water evenly at a ratio of 1:0.1:0.2 to ensure that the composite binder meets the strength requirements of the agglomerate. After being cold-pressed by a mechanical hydraulic agglomerator, it is naturally dried to a size of Φ76×150mm, For agglomerates with a cold strength greater than 85%, if the agglomerates are too small, the gas permeability of the charge will deteriorate, promote the formation of furnace knots, and increase the amount of smoke and dust and the rate of scum. If the block is too large, it is easy to form a "cross air" phenomenon in the furnace, reducing the reaction contact area, which is not conducive to the reduction of lead and zinc. This lumpiness requirement ensures that the f...

Embodiment 2

[0033] A method for directly smelting oxide materials by cold pressing, comprising the steps of:

[0034] Step 1. Mix the ingredients and cold press them into a ball:

[0035] The ratio of material, composite binder and water is 1:0.1:0.2 and mixed evenly, after being cold-pressed by a mechanical hydraulic agglomerator, it is naturally dried into agglomerates with a size of Φ50mm×120mm and a cold strength greater than 85%;

[0036] Step two, reduction smelting:

[0037] The dried cold-pressed mass and coke are directly fed into the smelting furnace for reduction smelting through the feeding device, and the gas composition of the smelting furnace is controlled to be: CO 22%, CO 2 9%, O 2 0.2%, CH 4 2%, the blast pressure is 45,000Pa, the hot air temperature is 880°C, the coke ratio of the coke ratio is 0.355%, and finally slag with a zinc content of 6-7.5% is obtained to obtain crude lead and zinc.

Embodiment 3

[0039] 1. A method for direct smelting of oxide materials by cold pressing, comprising the following steps:

[0040] Step 1. Mix the ingredients and cold press them into a ball:

[0041] The ratio of material, composite binder and water is 1:0.12:0.24 and mixed evenly, after being cold-pressed by a mechanical-hydraulic pelletizer, it is naturally dried into agglomerates with a size of Φ80mm×150mm and a cold strength greater than 85%;

[0042] Step two, reduction smelting:

[0043] The dried cold-pressed mass and coke are directly fed into the smelting furnace for reduction smelting through the feeding device, and the gas composition of the smelting furnace is controlled to be: CO 24%, CO 2 11%, O 2 0.4%, CH 4 3%, the blast pressure is 60,000Pa, the hot air temperature is 950°C, the coke ratio of the coke ratio is 0.383%, and finally slag with a zinc content of 6-7.5% is obtained to obtain crude lead and zinc.

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Abstract

The invention discloses a direct smelting method of oxidation material cold-pressing pellets, and belongs to the field of nonferrous pyrometallurgy. The problems that in an existing method, the flow is long, energy consumption is large, and the working environment is poor are solved. The method comprises the steps of mixing and batching, cold-pressing pelletizing and reduction smelting. According to the method, energy saving, low consumption, high efficiency and environment friendliness are achieved; the cold-pressing pellets are used for replacing sintering blocks of lead-zinc sulphide air-blowing roasting to be directly added into a smelting furnace for reduction smelting; the technological process is shortened; material adaptability is expanded; the raw material structure is expanded; the problems of resource exhaustion and tension concentrate supply are relieved; diversity of the zinc pyrometallurgy raw material structure is achieved; the economical efficiency of the lead-zinc pyrometallurgy process is further improved; waste is recycled; environment protection is facilitated; resource recycling is facilitated; the metal recovery rate and the resource comprehensive utilization rate are increased; economic benefits and enterprise competitiveness are improved; development of circular economy is promoted; and meanwhile good social benefits are achieved.

Description

technical field [0001] The invention belongs to the field of non-ferrous pyrometallurgy, and in particular relates to a method for directly smelting oxide materials by cold pressing. Background technique [0002] Smelting in a closed lead-zinc smelting furnace is an advanced method for pyrometallurgical lead-zinc smelting. The first step of this method is blast sintering, that is, converting sulfides into oxides at high temperatures, and sintering the finely dispersed materials into porous For lump ore, the second step is reduction smelting in a closed smelting furnace, that is, adding agglomerates, coke and flux to the closed smelting furnace, and performing reduction smelting in a high temperature and strong reducing atmosphere. The process consumes a lot of energy and the working environment is poor. Under the new normal of exhausted resources and sluggish nonferrous metal market, it cannot bring strong competitiveness to enterprises. Contents of the invention [0003]...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/242C22B5/12C22B13/02C22B19/20
CPCC22B1/2406C22B1/242C22B5/12C22B13/02C22B19/20Y02P10/20
Inventor 殷勤生于建忠刘永强焦晓斌
Owner BAIYIN NONFERROUS GROUP
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