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Metallurgical slag recovery treatment method

A technology for recycling and processing metallurgical slag, applied in the chemical industry, can solve the problems of affecting the environment, ineffective treatment and recycling, large amount of metallurgical slag, etc., and achieve the effects of reducing accumulation and discharge, low equipment requirements and simple process

Pending Publication Date: 2020-11-13
内蒙古久卓环保科技有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] Metallurgical blast furnaces produce a large amount of metallurgical slag, which seriously affects the environment
At present, the industry has not yet effectively dealt with the technical process of recycling

Method used

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Examples

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Embodiment 1

[0066] 1) Sorting the metallurgical slag to remove impurities, and then crushing and sieving to obtain a powder smaller than 80 mesh;

[0067] 2) adding acid and water to the powder, adjusting the pH value of the solution to 1.5, and dissolving the metal therein;

[0068] 3) performing solid-liquid separation through a filter press to obtain porous silicate and the first supernatant respectively;

[0069] 4) in the first supernatant, continue to add sodium sulfate, generate calcium sulfate precipitation, obtain the second suspension that is suspended with calcium sulfate precipitation;

[0070] 5) performing solid-liquid separation on the second suspension by a centrifuge to obtain calcium sulfate as a precipitate and a second supernatant;

[0071] 6) In the second supernatant, sodium hydroxide is added to generate iron hydroxide precipitation;

[0072] 7) further solid-liquid separation by centrifuge to obtain ferric hydroxide and residual liquid;

[0073] 8) Sodium carbon...

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Abstract

The invention provides a metallurgical slag recovery treatment method. The method comprises the following steps of 1, adding an acidic solution to metallurgical slag to dissolve metals in the metallurgical slag to obtain a first suspension; 2, carrying out solid-liquid separation on the first suspension to obtain a first supernatant and porous silicate serving as a precipitate; 3, adding sulfuricacid or soluble sulfate or a solution thereof into the first supernatant to obtain a second suspension; 4, carrying out solid-liquid separation on the second suspension to obtain a second supernatantand calcium sulfate as a precipitate; and 5, adding sodium carbonate into the second supernate to obtain rare earth carbonate serving as a precipitate. According to the metallurgical slag recovery treatment method, mixed rare earth carbonate and a metal compound with high added values can be generated through a process technology of combining chemical and physical methods, so that the accumulationand emission of metallurgical wastes of a steel mill is effectively reduced, and valuable resources are recovered.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for recycling and treating metallurgical slag. Background technique [0002] Metallurgical blast furnaces produce a large amount of metallurgical slag, which seriously affects the environment. At present, the industry does not have the technical process to effectively deal with recycling. [0003] Therefore, it is an urgent problem to explore the recovery and utilization of metallurgical slag from the aspects of economic and technical feasibility. Contents of the invention [0004] In view of this, the present invention provides a metallurgical slag recovery and treatment method capable of efficiently recycling the metallurgical slag and effectively reducing the accumulation and discharge of the metallurgical slag. [0005] In order to solve the problems of the technologies described above, the present invention adopts the following technical so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B3/04C22B7/04C22B59/00C22B26/20C01F17/247C01F11/46C01G49/02C01B33/20
CPCC01B33/20C01F11/46C01G49/02C21B3/04C22B7/007C22B7/04C22B26/20C22B59/00C01F17/247Y02W30/50Y02P10/20
Inventor 党金荣李少雄
Owner 内蒙古久卓环保科技有限公司
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