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Processes for treating metal surface waste

A metal surface and waste technology, which is applied to the process of processing metal surface waste and the new process field of processing stainless steel metal surface waste, can solve the problems of underground water and soil pollution, occupation of large land resources, etc., to eliminate secondary pollution and save energy. resources, the effect of eliminating the hidden danger of secondary pollution

Active Publication Date: 2020-02-04
TSINGTUO GRP CO LTD
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

At present, such metal surface wastes in China are generally treated as hazardous waste landfills, which not only need to occupy a large amount of land resources, but also cause great pollution to groundwater and soil.

Method used

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  • Processes for treating metal surface waste
  • Processes for treating metal surface waste

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[0061] Now with 9 square meters fluidized furnace, 33000kVA electric furnace, 75tAOD refining furnace, R10 two machines and two streams small slab continuous casting machine to produce stainless steel as an example, describe the method for implementing the present invention:

[0062] 1) Utilize the waste heat of the high-temperature oxidized slag from the fluidized roasting furnace to dry the moisture of the metal surface waste to less than 20%. After the dried metal surface waste and sulfide ore are mixed in a certain proportion, they are put into the boiling roaster through the feeding equipment, and the temperature is controlled within the range of 700-980°C. Formation of SO during boiling roasting 2 After passing through the packing tower, dust removal device and other purification devices in the purification section, most of the dust, arsenic, fluorine and other impurities are removed, and then enter the conversion section to generate SO 3 . Finally, in the adsorption s...

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Abstract

Provided is a process for treating a metal surface waste, comprising the following steps: a) providing a metal surface waste; b) mixing the metal surface waste with a sulphide ore and reacting with oxygen in a calcination section (1) to generate an oxidized slag and sulphur dioxide; c) using sulphur dioxide to prepare sulphuric acid; and d) using the oxidized slag generated in the calcination section (1) to smelt an alloy.

Description

technical field [0001] The invention generally relates to the technical field of metallurgical engineering, in particular to a process for treating waste on metal surfaces, and more particularly to a new process for treating waste on stainless steel metal surfaces. Background technique [0002] Stainless steel is widely used in various industrial and civil fields, and it is divided into various series (such as 200 series and 300 series) according to the difference of metal content. Metal chromium and nickel are important chemical components of 300 series stainless steel, in which the nickel content is greater than 8%. The main source of nickel in this type of stainless steel is nickel present in nickel concentrate in the form of nickel sulfide (NiS). At present, nickel in nickel sulfide ore at home and abroad is mainly obtained through the following steps: roasting concentrate with reverberatory furnace (electric furnace or blast furnace), smelting copper nickel sulfur, blo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B1/10C01B17/74C22C33/04
CPCC01B17/74C21C5/005C22B1/02C22B1/10C22C33/04
Inventor 姜海洪
Owner TSINGTUO GRP CO LTD
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