KR20180103456A - Method for preparing the lime sulfur with steel industry by-product and lime sulfur prepared therefrom - Google Patents

Abstract

The present invention relates to a method for preparing a lime-sulfur mixture including: a step of protruding a mixed solution with calcium ions eluted by reacting iron making by-products and an eluting agent; a step of heating the mixed solution at 80 to 120°C; and a step of reacting the heated mixed solution with sulfur. According to the present invention, a lime-sulfur mixture can be produced by using the calcium ions extracted from the iron making by-products and high temperature liquid sulfur produced from a purification process of coke oven gas, thereby contributing to adding higher value to the iron making by-products.

Description

TECHNICAL FIELD The present invention relates to a method for producing a lime sulfur mixture by using a by-product of steel making, and a lime sulfur mixture prepared by the method. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lime-

The present invention relates to a process for preparing a lime sulfur mixture using steel byproducts and a lime sulfur mixture produced thereby.

The lime sulfur mixture was used in 1881 in France for the control of grape pests and diseases, and has been used for controlling various fruit pests. Particularly, the lime sulfur mixture is widely used for the prevention of axillary disease, Donggo disease, black disease, powdery mildew, monia, panic disease, pterygia and mite, and is cheap.

The lime sulfur mixture is composed of CaS ₄ , CaS ₅ , CaSO ₄ , CaS ₂ O ₅ and water. Calcium sulfide (CaS ₅ ), which is the main component of the lime sulfur mixture, is an unstable chemical substance and comes into contact with oxygen and carbon dioxide Active sulfur is generated as shown in the following reaction formula, and the activated sulfur produced at this time exhibits a strong sterilizing power.

(Reaction Scheme 1) CaS ₅ + CO ₂ + H ₂ O → CaCO ₃ + H ₂ S + 4S

The bactericidal action of the lime sulfur mixture is caused by the action of active sulfur produced when the active ingredient, CaS ₅ , is oxidized in contact with oxygen in the air, and the active sulfur acts on the respiratory system of pathogens, In addition to inhibiting the production of ATP, the respiration system of the pathogen promotes respiration for the production of ATP, so that the energy consumption of the cells increases and the pathogen is eventually killed.

The lime sulfur mixture is also known to be useful for the purification of soil and water quality contaminated with heavy metals.

On the other hand, the steel industry consumes a large amount of raw materials and energy and produces not only steel but also various kinds of by-products and wastes, resulting in about 50% of the major steel products

In the case of steel mills equipped with integrated steelmaking processes, many kinds of by-products and wastes are generated in a complicated connection production system including raw materials, steelmaking, steelmaking, rolling and stainless steel, and these wastes are recycled such as iron, carbon and limestone Contains as much available resources as possible.

Moreover, as the global environment becomes a big issue, it is necessary to reduce the amount of various kinds of steel wastes generated as much as possible, to recycle resources by recycling them, to reduce waste disposal costs and to prevent environmental pollution. Therefore, steel byproducts and slag should be used as substitutes for natural resources in terms of protection of depleted natural resources.

It is an object of the present invention to provide a method for manufacturing a lime sulfur mixture using high-temperature liquid sulfur produced in a refining step of calcium ions extracted from steel by-products and coke oven gas.

According to an embodiment of the present invention, there is provided a method for preparing a mixed solution, comprising: reacting a steel by-product containing calcium ions with a solvent to prepare a mixed solution from which calcium ions are eluted; Heating the mixed solution to 80 to 120 캜; And reacting the heated mixed solution with sulfur.

The steel by-products may be at least one selected from the group consisting of steelmaking slag, blast furnace slag, converter slag, and electric furnace slag.

The elution agent may be at least one selected from water, hydrogen peroxide aqueous solution, aqueous acid solution and aqueous salt solution.

The acid may be at least one selected from acetic acid, nitric acid, hydrochloric acid, sulfuric acid and propionic acid.

The salt may be at least one selected from ammonium nitrate, ammonium chloride, and ammonium acetate.

The sulfur may be liquid sulfur produced in a coke oven gas refining process.

The temperature of the liquid sulfur may be between 120 and 400 < 0 > C.

The mixing ratio of the steel by-product and the solvent may be 1: 2 to 1: 100.

The step of eluting the calcium ions may be performed for 10 to 90 minutes.

The molar ratio of the calcium ion to the sulfur may be 1: 3 to 1: 7.

CaO and CaO slurry may be further added to the mixed solution.

The step of reacting the calcium ions with sulfur may be performed at 100 to 160 ° C.

The step of reacting the calcium ions with sulfur may be performed for 30 to 240 minutes.

And filtering the mixed solution from which the calcium ions have been eluted to remove the residues.

The method may further include reacting the heated mixed solution with sulfur, and then separating the residue.

According to another embodiment of the present invention, a lime sulfur mixture produced by the above production method is provided.

According to one embodiment of the present invention, the calcium ion extracted from iron by-products and the high-temperature liquid sulfur produced in the coke oven gas purification process can be used to produce a lime sulfur mixture, thereby contributing to high value-added by-products of steelmaking processes.

1 is a schematic view schematically showing a method of producing a lime sulfur mixture according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to various embodiments. However, the embodiments of the present invention can be modified into various other forms, and the scope of the present invention is not limited to the embodiments described below.

According to an embodiment of the present invention, there is provided a method for preparing a mixed solution, comprising: reacting a steel by-product containing calcium ions with a solvent to prepare a mixed solution from which calcium ions are eluted; Heating the mixed solution to 80 to 120 캜; And reacting the heated mixed solution with sulfur. The present invention also provides a method for producing a lime sulfur mixture comprising the steps of:

In general, the lime sulfur mixture is prepared by adding calcium oxide (CaO) when the sulfur and water are mixed and heated to a predetermined temperature or higher after heating.

Because the steelmaking process uses iron ore and coal as main raw materials, a large amount of by-products such as slag and sulfur are generated. Therefore, in the present invention, calcium ions necessary for the production of the lime sulfur mixture are eluted from iron by-products.

Among steel byproducts, blast furnace slag is mainly used as aggregate for civil engineering and construction, and some is used as silicate fertilizer. Since blast furnace slag is mainly used for silicate fertilizer because SiO ₂ is the main component and steel slag is heavier and harder than blast furnace slag, it is mainly used as aggregate for civil engineering and recently it is known as a material which is friendly to marine environment and spreading.

However, as in the present invention, there is no known technology for preparing a lime sulfur mixture by eluting calcium ions from steel byproducts.

The steel byproducts may be at least one selected from the group consisting of steel making slag, blast furnace slag, converter slag, and electric furnace slag, which are generated in a steel making process. The steel by-products used in the present invention preferably have a higher calcium content.

Blast furnace slag and steel slag are the slag generated in the steelmaking and steelmaking process. The main constituents are CaO and SiO ₂ .

SiO ₂ CaO Al ₂ O ₃ T-Fe MgO S Blast furnace slag 33.1 40.0 13.7 0.4 8.6 1.04 Steel slag 11.2 41.5 1.4 20.0 6.5 -

The iron by-products and the leaching agent are reacted to elute calcium ions (Ca ²⁺ ) from the iron by-products. The solvent may be water, aqueous hydrogen peroxide, an aqueous acid solution or an aqueous solution of a salt. Preferably, water and an ammonium salt may be mixed. It is a matter of course that the Ca ²⁺ elution efficiency and the elution metal component may vary depending on the type of the eluent used.

The acid is not particularly limited, but for example, acetic acid, nitric acid, hydrochloric acid, sulfuric acid and propionic acid can be used, and acetic acid can be preferably used.

The salt is not particularly limited, but for example, ammonium nitrate, ammonium chloride, and ammonium acetate can be used, and ammonium chloride can be preferably used.

In this case, the mixing ratio of the steel by-product and the solvent may be 1: 2 to 1: 100, and preferably 1: 5 to 1:20. The mixing ratio of the iron by-product with a mixture 1: may be in Ca ^{2 +} elution efficiency less than 2 if the slag decrease, 1: 100 more than, the effluent within a Ca ^{2 +} concentration is low, lime sulfur mixture production efficiency may be degraded.

The step of reacting the iron byproduct with the eluent to elute the calcium ions may be performed for 10 to 90 minutes, preferably 20 to 40 minutes. The longer the mixing time becomes high the Ca ^{2 +} elution efficiency, the stirring time gileodo Ca ^{2 +} It is particularly preferred to be carried out for over 20 to 40 minutes the elution until a saturated solution.

The method may further comprise preparing a mixed solution in which the calcium ions are eluted, and then filtering the mixed solution to remove the residues. In the process of eluting calcium ions from iron by-products, iron, magnesium and the like may be eluted in addition to Ca ^2+. Therefore, it is preferable to remove residues by filtration. The filtration can be performed using known filtration means and is not particularly limited.

Preferably, the mixed solution from which the calcium ions are eluted is heated to a reaction starting temperature of the lime sulfur mixed preparation by heating the mixed solution to 80 to 120 캜 by heating the mixture before reacting with sulfur.

The lime sulfur mixture is prepared in accordance with the following reaction formula, and the following reaction is initiated by an exothermic reaction at a temperature of 110 to 120 ° C, so that the temperature of the mixed solution before the reaction with sulfur is preferably 80 to 120 ° C .

(Scheme _{2) CaO + S + H 2} O → CaSn (n = 4 ~ 5), (CaO: S: H 2 O = 1: 2 ~ 2.5: 8)

Next, the mixed solution and sulfur are reacted to prepare a lime sulfur mixture. In the present invention, a lime sulfur mixture can be prepared using liquid sulfur produced in a coke oven gas purification process, and the temperature of the liquid sulfur produced in the coke oven gas purification process may be 120 to 400 ° C have.

The coke oven gas generated in the coke production process contains a large amount of sulfur (S). Sulfur is produced in the purification process. In the production of the lime sulfur mixture, powdery sulfur can be used. However, when the high-temperature liquid sulfur (> 120 ° C) produced in the coke oven gas purification process as in the present invention is used, There is no need to supply additional energy

The molar ratio of the calcium ion to the sulfur may be 1: 3 to 1: 7, and preferably 1: 4 to 1: 5. Considering the production efficiency of the lime sulfur mixture, it is particularly preferable that the molar ratio of the calcium ion to the sulfur is 1: 4 to 1: 5.

And controlling the molar ratio of the calcium ion to the sulfur to be 1: 3 to 1: 7. For example, it is preferable to add a substance containing calcium ions such as calcium oxide (CaO) and CaO slurry to the mixed solution so that the molar ratio of the calcium ion to the sulfur is controlled to be 1: 3 to 1: 7.

The reaction temperature of the calcium ion and the sulfur may be 100 to 160 ° C, preferably 110 to 120 ° C, which is the boiling point of the lime sulfur mixture.

The time for reacting the calcium ions and the sulfur may be 30 to 240 minutes. If an appropriate reaction time is not given, the production efficiency of CaSn may be lowered and unreacted Ca and sulfur may be contained in the solution. If the reaction time is too long, the production efficiency of the lime sulfur mixture may be lowered. .

Thereafter, the residue may be separated from the solution containing the manufactured lime sulfur mixture to prepare a lime sulfur mixture in a solution state. Separation of the residue may be performed using known separation means, and is not particularly limited.

Example

Example 1: Elution of calcium ions from steel by-products

Example 1-1

To 0.1 kg of steelmaking slag having the composition shown in Table 1 above, 2 L of water was mixed as an eluting agent to elute Ca ²⁺ , and the components of the mixed solution were observed and shown in Table 3 below.

Examples 1-2

Except that the elution agent with a mixture of water and ammonium chloride and is eluted for Ca ^{2 +} in the slag in the same manner as in Example 1. The results are shown in Table 2 below.

Mixed solution component (mg / L) Ca ^{2 +} Fe Mg Si Solvent Example 1-1 860 - - 1.6 Examples 1-2 7580 0.2 19.9 50

Referring to Table 2, in the case of Example 1-2 Ca to check the elution efficiency of ^{+ 2} is very excellent, it can be seen that a large number of metals such as iron, magnesium, eluting at the same time. In the case of Examples 1-1 and other metals are eluted may be confirmed that, in Example 1-2 than in low Ca ^{2 +} dissolution efficiency does not.

Example 2: Preparation of lime sulfur mixture

Example 2-1

The mixed solution of Example 1-1 was filtered to remove the residue, and the mixed solution was heated to a temperature of 100 占 폚. Subsequently, the mixed solution was mixed with liquid sulfur (150 ° C) five times the molar number Ca ^{2 +} eluted, and the mixture was reacted at 120 ° C for 3 hours. Then, the residue was separated from the prepared lime sulfur mixture solution to prepare a lime sulfur mixture in a solution state. The production efficiency of the lime sulfur mixture was observed and is shown in Table 3 below.

Example 2-2

A lime sulfur mixture was prepared in the same manner as in Example 2-1, except that the mixed solution of Example 2-1 was used, and the production efficiency was observed and shown in Table 3 below.

Comparative Example 1

In a known method, sulfur was added to water, heated and dissolved, and calcium oxide was added to prepare a lime sulfur mixture. The production efficiency is shown in Table 3 below.

Lime sulfur conversion efficiency (%) Comparative Example 1 88 Example 2-1 99 Example 2-2 43

Referring to Table 3, it can be seen that the production efficiency of the lime sulfur mixture of Example 2-1 is the highest at 99%. Examples 2-2 to check that the production efficiency of the lime sulfur mixture is lower by 43%, which is evaluated in the effect of the other metals in addition to dissolution Ca ^{+ 2.}

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be obvious to those of ordinary skill in the art.

Claims (16)

Reacting a steel by-product containing calcium ions with a solvent to prepare a mixed solution in which calcium ions are eluted;
Heating the mixed solution to 80 to 120 캜; And
And reacting the heated mixed solution with sulfur
A method for producing a lime sulfur mixture.
The method according to claim 1,
Wherein the steel by-products are at least one selected from the group consisting of steelmaking slag, blast furnace slag, converter slag, and electric furnace slag.
The method according to claim 1,
Wherein the elution agent is at least one selected from the group consisting of water, hydrogen peroxide solution, aqueous acid solution and aqueous salt solution.
The method of claim 3,
Wherein the acid is at least one selected from acetic acid, nitric acid, hydrochloric acid, sulfuric acid and propionic acid.
The method of claim 3,
Wherein the salt is at least one selected from ammonium nitrate, ammonium chloride and ammonium acetate.
The method according to claim 1,
Wherein the sulfur is liquid sulfur produced in a coke oven gas refining process.
The method according to claim 6,
Wherein the temperature of the liquid sulfur is 120 to 400 占 폚.
The method according to claim 1,
Wherein the mixing ratio of the steel by-product to the leaching agent is 1: 2 to 1: 100.
The method according to claim 1,
Wherein the step of eluting the calcium ions is carried out for 10 to 90 minutes.
The method according to claim 1,
Wherein the molar ratio of calcium ions to sulfur is 1: 3 to 1: 7.
The method according to claim 1,
Wherein calcium oxide and calcium oxide slurry are further added to the mixed solution.
The method according to claim 1,
Wherein the step of reacting the calcium ions with sulfur is performed at 100 to 160 ° C.
The method according to claim 1,
Wherein the step of reacting the calcium ions with sulfur is performed for 30 to 240 minutes.
The method according to claim 1,
Further comprising filtering the mixed solution from which the calcium ions have been eluted to remove residues.
The method according to claim 1,
Further comprising the step of reacting the heated mixed solution with sulfur, and then separating the residue.
A lime sulfur mixture prepared by the process according to any one of claims 1 to 15.

Images