CN103255294A

CN103255294A - Comprehensive reuse process of ferrochrome smelting slag

Info

Publication number: CN103255294A
Application number: CN2013101747440A
Authority: CN
Inventors: 唐翔
Original assignee: Individual
Current assignee: Individual
Priority date: 2012-05-02
Filing date: 2013-04-28
Publication date: 2013-08-21
Also published as: CN102676831A

Abstract

The invention discloses a comprehensive reuse process of ferrochrome smelting slag, belonging to the field of comprehensive utilization of metallurgy slag. A chemical method is adopted, an acid-alkali process is additionally adopted, and substances in the slag can be directly extracted to directly produce serial chemical products with high additional value. The treatment process is free of secondary pollution and wastewater, waste gas and waste residue discharge, is clean, environment-friendly and energy-saving. A great deal of slag can be treated, the cost is low, the comprehensive utilization rate is high, recycled products are good in quality, high in value and large in market demand. By utilizing the process, the circulation economic development is greatly prompted.

Description

The comprehensive recycling technology of ferrochrome smelting slag

Technical field

The present invention relates to the comprehensive recycling technology of a kind of ferrochrome smelting slag, belong to the technical field of extracting substance direct production Chemicals from the industry metallurgy waste residue, be particularly suitable for the slag ashes processing that ferrochrome smelting enterprise produces.

Background technology

Original ferrochrome smelting treatment of slag falls as offal treatment basically, has only the enterprise of only a few to be used for cement brick processed.So both occupied ground and land resources also were the significant wastage to resource, were unfavorable for the requirement of green environment development.Existing technology is just carried out processing and utilizing to containing high-titanium blast furnace slag, but has many deficiencies, and utilising efficiency is not high, and practical application is difficult to promote.

Disclosed Chinese invention patent " with the method for the treatment of blast furnace slag with diluted chlorhydric acid ", the patent No.: CN94108086.2, publication number: CN1099424, open day: 1995.03.01, there is following problem in this invention:

1. do not utilize and extract iron protoxide in the slag, thin iron powder.

2. slag contains Fe in the solution behind dissolving with hydrochloric acid ²⁺, there is not extraction and application, influence other metal ion extraction in the solution.

3. contain Mg in the solution ²⁺, AI ³⁺Ion adds hydrochloric acid uncrystallizable separation purification magnesium chloride and aluminum chloride.

Therefore, adopt existing technology to be difficult to the ferrochrome smelting slag is carried out comprehensive recycling.Because it is increasingly extensive that ferrochrome is used, domestic ferrochrome smelting industry is flourish, and the annual slag that produces up to ten million tons can't be handled, and takies a large amount of land resourcess, and environment is caused detrimentally affect.Owing to be rich in multiple metal in the slag, country " 12 " planning explicitly calls for, the ferrous metallurgy waste reside comprehensive utilization, as an important behave of recycling economy development.

Summary of the invention

The objective of the invention is to comprehensive recycling ferrochrome smelting slag, protection environment and resource turn waste into wealth, and promote recycling economy development, create good business economic benefit and social benefit, benefit the nation and the people.

The objective of the invention is to reach by following measure:

The comprehensive recycling technical process of a kind of ferrochrome smelting slag is characterized in that: in the comprehensive recycling process of ferrochrome smelting slag, add alkali and the material in the slag all can be extracted through adding acid, directly make series chemical product, step is as follows:

1. with slag (its composition: FeCr, FeO, Cr ₂O ₃, AI ₂O ₃, MgO, SiO ₂, CaO) wear into 200 order fine powders, the acid that adds capacity was fully stirred 2-3 hour, and collected hydrogen and obtain hydrogen product, question response adds water fully and makes soluble substance become ion, the metal ion in the mixing solutions is: Cr ³⁺, Fe ²⁺, AI ³⁺, Mg ²⁺, Ca ²⁺, throw out is: Cr ₂O ₃, SiO ₂

2. discharge solution filters throw out, wash, and obtains Cr ₂O ₃, SiO ₂, add hydrofluoric acid again, make SiO ₂SiF is made in dissolving ₄Product, insolubles filtration, washing, drying make Cr ₂O ₃Product;

3. mixing solutions (Cr ³⁺, Fe ²⁺, AI ³⁺, Mg ²⁺, Ca ²⁺) the middle alkali that adds, make Cr ³⁺, Fe ²⁺, AI ³⁺All be precipitated as Cr (OH) ₃, Fe (OH) ₃, AI (OH) ₃, discharge solution (Mg ²⁺, Ca ²⁺), throw out to be filtered, washs, drying makes Cr (OH) ₃, Fe (OH) ₃, AI (OH) ₃Mix product;

4. (Mg in the mixing solutions ²⁺, Ca ²⁺) adding Na ₂SO ₄Or MgSO ₄, make Ca ²⁺All be precipitated as CaSO ₄, discharge solution, throw out to be filtered, washs, drying makes products C aSO ₄

5. add alkali in the mixing solutions, make Mg ²⁺All be precipitated as Mg (OH) ₂, discharge solution, throw out to be filtered, washs, drying makes product Mg (OH) ₂, the solution circulated recycling of discharge;

6. will make Cr (OH) ₃, Fe (OH) ₃, AI (OH) ₃Mixture further separate purification, add alkali and make AI (OH) ₃Dissolving fully, filtration, washing obtain Cr (OH) ₃, Fe (OH) ₃Mixture adds acid and makes the AI (OH) that has dissolved in the filtrate ₃Become AI (OH) again ₃Precipitation is separated out fully, and filtration, washing, drying make product A I (OH) ₃

7. with Cr (OH) ₃, Fe (OH) ₃Add alkali in the mixture and make Cr (OH) ₃Dissolving fully, filtration, washing, drying make product F e (OH) ₃, add acid in the filtrate and make the Cr (OH) that has dissolved ₃Become Cr (OH) again ₃Precipitation is separated out fully, and filtration, washing, drying make products C r (OH) ₃, with this products C r (OH) ₃Make Cr through high-temperature roasting ₂O ₃The chrome green product;

8. with Cr (OH) ₃, Fe (OH) ₃Add acid in the mixture and make Cr (OH) ₃Dissolving fully, filtration, washing, drying make product F e (OH) ₃, the filtrate evaporation drying is made the chromic salt product.

Embodiment

For improving this invention technology, become scientific and technological productive forces.In on 02 15th, 2012 to the slag of ferrochrome smelting enterprise Hunan Province to red iron alloy company limited, divide according to this technical process and to handle for 3 times, average, the result shows:

1. all substances are extracted and produce series chemical product in the slag, and the product that comprehensive utilization ratio 98.5% (wherein 1.5% is ashes) is produced by 1 ton of slag extracting substance of every processing calculates finished product: Cr (OH) ₃230kg, Fe (OH) ₃310kg, Cr ₂O ₃190kg, Mg (OH) ₂205kg, CaSO ₄90kg, AI (OH) ₃140kg, SiF ₄160kg, H ₂9.8kg, chromic salt 250kg.

2. whole slag treatment flow process non-secondary pollution does not have " three wastes " discharging, environmental protection, energy-conservation, cleaning.

Practice shows that this invention technology has better practicability, meets the requirement of recycling economy development, and good benefits in environment, economic benefit and social benefit are arranged.

Claims

1. comprehensive recycling technical process of ferrochrome smelting slag is characterized in that: in the comprehensive recycling process of ferrochrome smelting slag, add alkali and the material in the slag all can be extracted through adding acid, directly make series chemical product, step is as follows:

(1). with slag (its composition: FeCr, FeO, Cr ₂O ₃, AI ₂O ₃, MgO, SiO ₂, CaO) wear into 200 order fine powders, the acid that adds capacity was fully stirred 2-3 hour, and collected hydrogen and obtain hydrogen product, question response adds water fully and makes soluble substance become ion, the metal ion in the mixing solutions is: Cr ³⁺, Fe ²⁺, AI ³⁺, Mg ²⁺, Ca ²⁺, throw out is: Cr ₂O ₃, SiO ₂

(2). discharge solution, throw out is filtered, washs, obtain Cr ₂O ₃, SiO ₂, add hydrofluoric acid again, make SiO ₂SiF is made in dissolving ₄Product, insolubles filtration, washing, drying make Cr ₂O ₃Product;

(3). mixing solutions (Cr ³⁺, Fe ²⁺, AI ³⁺, Mg ²⁺, Ca ²⁺) the middle alkali that adds, make Cr ³⁺, Fe ²⁺, AI ³⁺All be precipitated as Cr (OH) ₃, Fe (OH) ₃, AI (OH) ₃, discharge solution (Mg ²⁺, Ca ²⁺), throw out to be filtered, washs, drying makes Cr (OH) ₃, Fe (OH) ₃, AI (OH) ₃Mix product;

(4). (Mg in the mixing solutions ²⁺, Ca ²⁺) adding Na ₂SO ₄Or MgSO ₄, make Ca ²⁺All be precipitated as CaSO ₄, discharge solution, throw out to be filtered, washs, drying makes products C aSO ₄

(5). add alkali in the mixing solutions, make Mg ²⁺All be precipitated as Mg (OH) ₂, discharge solution, throw out to be filtered, washs, drying makes product Mg (OH) ₂, the solution circulated recycling of discharge;

(6). will make Cr (OH) ₃, Fe (OH) ₃, AI (OH) ₃Mixture further separate purification, add alkali and make AI (OH) ₃Dissolving fully, filtration, washing obtain Cr (OH) ₃, Fe (OH) ₃Mixture adds acid and makes the AI (OH) that has dissolved in the filtrate ₃Become AI (OH) again ₃Precipitation is separated out fully, and filtration, washing, drying make product A I (OH) ₃

(7). with Cr (OH) ₃, Fe (OH) ₃Add alkali in the mixture and make Cr (OH) ₃Dissolving fully, filtration, washing, drying make product F e (OH) ₃, add acid in the filtrate and make the Cr (OH) that has dissolved ₃Become Cr (OH) again ₃Precipitation is separated out fully, and filtration, washing, drying make products C r (OH) ₃, with this products C r (OH) ₃Make Cr through high-temperature roasting ₂O ₃The chrome green product;

(8). with Cr (OH) ₃, Fe (OH) ₃Add acid in the mixture and make Cr (OH) ₃Dissolving fully, filtration, washing, drying make product F e (OH) ₃, the filtrate evaporation drying is made the chromic salt product.