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Blast furnace cloth bag ash resource utilization process method

A process method, the technology of bag ash, applied in the field of waste resource utilization, can solve the problems of unfavorable iron and steel enterprises, such as energy saving and consumption reduction, huge investment and operating costs, and the generation of electrolytic wastewater, so as to achieve high selective leaching function and increase income. The effect of low efficiency and energy consumption

Pending Publication Date: 2021-01-01
INST OF RES OF IRON & STEEL JIANGSU PROVINCE +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage of this method is that the use of rotary hearth furnace or rotary kiln to roast blast furnace bag ash has huge investment and operation costs, and the energy consumption of zinc recovery by wet electrolysis is huge, and electrolytic wastewater is generated, which brings secondary pollution, which is not conducive to iron and steel enterprises. The energy saving and consumption reduction has brought new environmental protection problems

Method used

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  • Blast furnace cloth bag ash resource utilization process method

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Comparison scheme
Effect test

Embodiment 1

[0050] A process method for resource utilization of blast furnace bag ash specifically includes:

[0051] 1. The process steps of adding medicament, water washing and fractional crystallization to recover potassium chloride and sodium chloride specifically include:

[0052] (1), grind the blast furnace bag ash until the particle size is less than 200 mesh, then mix water and blast furnace bag ash according to the liquid-solid ratio of 6:1 by mass, and add 0.5mol / L potassium carbonate solution to obtain the solid The liquid mixture was stirred at a speed of 360r / min for 10min;

[0053] (2) Filtrate the solid-liquid mixture that has been stirred well and uniformly to obtain primary leaching liquid and primary leaching slag. When the chlorine content in the primary leaching solution is lower than 15wt% water, return to the previous step for water washing; when the chlorine content in the primary leaching solution is higher than 15wt% water, it is used for the next step of ammoni...

Embodiment 2

[0063] 1. The process steps of adding medicament, water washing and fractional crystallization to recover potassium chloride and sodium chloride specifically include:

[0064] (1), grind the blast furnace bag ash until the particle size is less than 200 mesh, then mix water and blast furnace bag ash according to the liquid-solid ratio of 6:1 by mass, and add 0.5mol / L sodium carbonate solution to obtain the solid The liquid mixture was stirred at a speed of 360r / min for 10min;

[0065] (2) Filtrate the solid-liquid mixture that has been stirred well and uniformly to obtain primary leaching liquid and primary leaching slag. When the chlorine content in the primary leaching solution is lower than 15wt% water, return to the previous step for water washing; when the chlorine content in the primary leaching solution is higher than 15wt% water, it is used for the next step of ammonia washing; after the primary leaching solution enriched in potassium chloride is purified and removed ...

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Abstract

The invention discloses a blast furnace cloth bag ash resource utilization process method, which uses blast furnace cloth bag ash as a raw material, and aims to realize resource recovery of chlorine,potassium and zinc and cyclic utilization of iron-containing and carbon-containing materials in a steel mill. The process method comprises a process step of recovering potassium and sodium by washingblast furnace cloth bag ash with water and crystallizing step by step, a process step of leaching zinc oxide with ammonia salt and a process step of recovering zinc oxide by evaporation, crystallization and calcination. According to the technological process, high-value utilization of the blast furnace cloth bag ash and cyclic utilization of the blast furnace cloth bag ash in the steel mill are achieved, energy conservation and emission reduction of iron and steel enterprises are promoted, and waste is turned into wealth.

Description

technical field [0001] The invention belongs to the field of resource utilization of waste, and in particular relates to the process of recovering potassium chloride and sodium chloride through step-by-step crystallization by adding chemicals, washing with water, leaching zinc oxide with ammonia-ammonium salt, and recovering zinc oxide through evaporating crystallization and calcining by adopting a wet process flow process to realize resource reuse of blast furnace bag ash. Background technique [0002] Blast furnace bag ash is a high-temperature mixture of iron ore powder, coke, limestone and other iron-making raw materials. It is obtained by collecting blast furnace gas dry bag ash. The main components are carbon and iron oxide, accounting for 60-70% in total. In addition, It also contains some elements harmful to blast furnace smelting, among which zinc element accounts for 5-10% and chlorine element accounts for 2-5%, which greatly limits its recycling in iron and steel ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G9/02C01D3/04C01C1/242B09B3/00C22B19/34C22B19/30C21B3/04
CPCC01G9/02C01D3/04C01C1/242C22B19/34C22B19/30C21B3/04C21B2200/00B09B3/80Y02P10/20Y02P20/10Y02W30/50
Inventor 苏航毛瑞茅沈栋王飞
Owner INST OF RES OF IRON & STEEL JIANGSU PROVINCE
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