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Comprehensive recovery and treatment process for smoke dust and slag containing zinc and iron

A soot and slag technology, which is applied in the comprehensive recovery and disposal process of zinc, iron fume and slag, can solve the problems of unreasonable utilization of leached slag, difficulty in degrading zinc ferrite, high added value of products, and achieve broad market application Prospects, achieving zero discharge of solid waste, and good stability

Pending Publication Date: 2022-06-21
CISDI RES & DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the current market wet treatment process for dust containing zinc and iron is mainly divided into acid method and ammonia method, which have the advantages of high purity zinc oxide and high added value of products; the disadvantages are high investment, serious equipment corrosion, and ferric acid in the material Zinc is difficult to degrade, and the leaching residue cannot be rationally utilized

Method used

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  • Comprehensive recovery and treatment process for smoke dust and slag containing zinc and iron

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] see figure 1 , is a comprehensive recovery and disposal process containing zinc, iron fume and slag, the steps are as follows:

[0036] Step 1: Take electric furnace soot from a steel plant as raw material, coal powder as carbon, and pickling sludge from the factory as binder, and use the form of internal carbon distribution to remove the electric furnace soot, coal powder, pickling sludge and Mixing with water, forming pellets and drying, the mass ratio of electric furnace dust: coal powder: pickling sludge is 84:13:3, the radius of carbon-containing pellets is 20-50mm, and the compressive strength is not less than 200N. The water content of the charge is less than 1.5% to ensure the strength of the pellets entering the furnace, the gas permeability of the material layer and the reducing atmosphere in the furnace.

[0037] Step 2: Select the submerged arc furnace as the smelting reduction equipment, start the submerged arc furnace and the dedusting fan, use the dedust...

Embodiment 2

[0045] In this example, the electric furnace dust of a certain steel plant is taken as the raw material, the coal powder is used as the internal carbon, and the binder commonly used in the market is used as the cementitious material. : 15: 2: 10, the pellets were made by mixing, pelletizing, and drying, and an induction furnace was used as the melting reduction equipment, and the rest were the same as those in Example 1.

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Abstract

The invention relates to a comprehensive recovery and disposal process for zinc-containing and iron-containing smoke dust and slag, which belongs to the technical field of metallurgical solid waste disposal, and specifically comprises the following steps of: adding the zinc-containing and iron-containing slag into a smelting furnace to form a molten pool under the absolute pressure of 1-50kPa in the smelting and melting period, pressing the zinc-containing and iron-containing smoke dust, internal carbon, a cementing material and water into balls into the smelting furnace in the smelting and reduction period, and carrying out smelting and reduction on the balls; zinc-containing flue gas passes through a condenser, an inertial dust collector and a bag-type dust collector to recover metal zinc powder, CO-containing tail gas is returned to serve as fuel to dry pellets, a slagging constituent is added in the smelting slagging period, molten slag is discharged from a slag outlet and made into granulated slag through gas quenching and a centrifugal granulator, molten iron / alloy liquid is discharged from a bottom iron outlet, and separation and recovery of zinc, iron and slag are achieved. According to the process, electricity is used as a main energy source, the attachment to gas such as coal gas is avoided, the defects of long flow and high energy consumption are overcome, the dezincification rate can reach 99% or above, the zinc powder purity can reach 90% or above, and secondary resource recovery and solid waste zero emission are achieved.

Description

technical field [0001] The invention belongs to the technical field of metallurgical solid waste disposal, and relates to a comprehensive recovery and disposal process of zinc, iron fume and slag. Background technique [0002] In 2020, my country's overall steel production capacity is about 1.213 billion tons, of which converter steel production accounts for about 60%, and electric furnace steel accounts for 40%. Different types of solid wastes such as zinc-containing, iron-containing dust or slag are generated in each process of iron and steel smelting. According to statistics, about 15-20kg of dust is generated per ton of steel in the converter steelmaking process, and about 10kg of dust ash is generated per ton of steel in the electric furnace steelmaking process. , according to the "Law on the Prevention and Control of Environmental Pollution by Solid Wastes (2020 Revision)" implemented on September 1, 2020, the zinc-containing dust produced by steelmaking has been offi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B7/04C22B1/243C22B1/248C22B19/20C22B19/30C21B13/00C21B3/06
CPCC22B7/02C22B7/04C22B7/001C22B1/2406C21B13/0006C21B13/0066C21B3/06C22B19/20C22B19/30C22B1/243C22B1/248Y02W30/50
Inventor 赵忠宇郭秀键田文杰雍海泉
Owner CISDI RES & DEV CO LTD