CN1730628A - Coke passivator and its usage - Google Patents

Abstract

The invention provides a coke deactivator for blast furnace iron-smelting, whose components include (by weight percent): boracic acid 70-90%, and borax 0-10%, and silica dioxide 5-30%. The coke deactivator is mixed with hot water to prepare 1-4% modified solution, and sprayed onto the surface of the cokes by the amount of 1-5% of the coke weight.

Description

A kind of coke deactivator and using method thereof

(1) technical field

The present invention relates to a kind of blast furnace ironmaking with coke deactivator and using method thereof, belong to the ironmaking technology field.

(2) background technology

Coke is the important fuel of blast-furnace smelting, it plays thermal source in blast furnace, reductive agent, vital role such as carburizing agent and stock column skeleton, because blast furnace adopts the fuel injection technology, coke is as thermal source, the effect of reductive agent and carburizing agent is weakened gradually, development along with ironmaking technology, improving constantly of fine fodder level, the raising of wind-warm syndrome level, the realization of the big injection technology of oxygen enrichment, modern blast furnace are smelted and have been obtained further reinforcement, along with the reduction of coke ratio, the raising of combustion intensity, coke load increases (many iron and steel enterprises coke load reaches more than 4.5), and the residence time of coke in blast furnace prolongs, and molten loss rate increases, the coke quality deterioration, at this moment, coke effect as the stock column skeleton in stove seems more and more important, and associated coke strenth index also more and more is subjected to the worker's of smelting iron attention, intensity index after the thermal response of coke particularly, it more can accurately reflect the ability of coke anti-molten damage reaction in blast furnace, can reflect that more coke as the stock column skeleton, bears the ability size of load.In general, the coke that post-reaction strength is good, its shatter strength (M40) and wear resistance (M10) might as well.So many kinds are intended to improve the technical measures of coke thermal characteristics arises at the historic moment, as: improve high-quality coking coal (coking coal, rich coal) ratio, improve technology such as coal blending quality, tamping coking, moulded coal briquetting, coal damping and dry coke quenching.If increase the high-quality caking coal ratio, improve the coal blending quality, the purpose that improves coke strenth can be reached, but increasing considerably of process cost can be caused.If adopt technology such as tamping coking, moulded coal briquetting, coal damping and dry coke quenching, can increase a large amount of scrap build tasks undoubtedly, and one-time investment is very big, the construction period is long.

Chinese patent application number 02113708 has provided a kind of coke modifying process, with the mixture of titanium dioxide, boron oxide and boric acid or be configured to solution with boric acid separately, as the coke quenching water quenching, or spray to coke on the travelling belt before coke enters coke bin, improve the thermal characteristics of coke, because the cost of titanium dioxide, boron oxide is very high, make the properties-correcting agent cost up, the solution that is disposed can cause a large amount of properties-correcting agent wastes as the coke quenching water quenching, and the technology cost is raise.

(3) summary of the invention

Technical scheme of the present invention be seek a kind of cheap and can the instead of titanium white powder, the material of boron oxide, mix by different ratios with boric acid, be configured to solution after, transport in the process of blast furnace coke bin at coke, be sprayed on the coke surface, reach the purpose that improves the coke thermal characteristics equally.

The object of the present invention is achieved like this:

1, disposes passivator by weight percentage

Wherein, boric acid 70～90%, borax 0～10% and fineness are below 500 orders, and purity is at the silicon-dioxide more than 98% 5～30%, and described boric acid refers to pure boric acid, if use industrial boric acid, can convert by its purity.

2, concentration disposes spray solution on request

Described passivator is put into fixed container, add water after (in order to improve solubleness, preferably to adding clear water heat), evenly stir, until dissolving fully, be mixed with weight percent concentration and be 1～4% solution.

3, implement to spray

The transportation of coke from cool Jiao Tai to the blast-furnace coke storehouse, select suitable spray point (on belt head or the belt all can), with the solution for preparing by topping-up pump and special nozzle, even, the vaporific coke surface that is sprayed at.

(4) embodiment

The present invention is described in detail below in conjunction with embodiment.

Embodiment 1:

Take by weighing weight by the quality of pure substance and account for 90% boric acid, 5% borax and 5% silicon-dioxide uniform mixing, add water then, water temperature is controlled at 60-80 ℃, being mixed with the % weight percent concentration by stirring is 3.5 solution, this solution is sprayed at coke surface by 2% straying quatity of weight of coke, carry out reactivity and post-reaction strength mensuration by standard GB/T4000-1996, gained result and check sample contrast the results are shown in following table:

Sample is other	The thermal characteristics prescription
		CRI CSR boric acid borax silicon-dioxide
	Benchmark sample test sample 1 test sample 2		31.63 58.43 0 0 0 25.62 62.92 100 0 0 25.74 63.8 90 5 5

Embodiment 2:

Take by weighing weight by the quality of pure substance and account for 80% boric acid, 5% borax and 10% silicon-dioxide uniform mixing, add water then, water temperature is controlled at 60-80 ℃, be mixed with the solution of 3.5% weight percent concentration by stirring, this solution is sprayed at coke surface by 2% straying quatity of weight of coke, carry out reactivity and post-reaction strength mensuration by standard GB/T4000-1996, gained result and check sample contrast the results are shown in following table:

Sample is other	The thermal characteristics prescription
		CRI CSR boric acid borax silicon-dioxide
	Benchmark sample test sample 1 test sample 3		31.63 58.43 0 0 0 25.62 62.92 100 0 0 24.1 65.15 80 5 15

Embodiment 3:

Take by weighing weight by the quality of pure substance and account for 70% boric acid, 10% borax and 20% silicon-dioxide uniform mixing, add water then, water temperature is controlled at 60-80 ℃, be mixed with the solution of 3.5% weight percent concentration by stirring, this solution is sprayed at coke surface by 2% straying quatity of weight of coke, carry out reactivity and post-reaction strength mensuration by standard GB/T4000-1996, gained result and check sample contrast the results are shown in following table:

Sample is other	The thermal characteristics prescription
		CRI CSR boric acid borax silicon-dioxide
	Benchmark sample test sample 1 test sample 4		31.63 58.43 0 0 0 25.62 62.92 100 0 0 24.14 67.59 70 10 20

Embodiment 4:

Take by weighing weight by the quality of pure substance and account for 90% boric acid, 10% silicon-dioxide uniform mixing, add water then, water temperature is controlled at 60-80 ℃, be mixed with the solution of 3.5% weight percent concentration by stirring, this solution is sprayed at coke surface by 2% straying quatity of weight of coke, carry out reactivity and post-reaction strength mensuration by standard GB/T4000-1996, gained result and check sample contrast the results are shown in following table:

Sample is other	The thermal characteristics prescription
		CRI CSR boric acid silicon-dioxide
	Benchmark sample test sample a test sample b		30.89 54.85 0 0 25.74 61.04 100 0 26.01 62.27 90 10

Embodiment 5:

Take by weighing weight by the quality of pure substance and account for 80% boric acid, 20% silicon-dioxide uniform mixing, add water then, water temperature is controlled at 60-80 ℃, be mixed with the solution of 3.5% weight percent concentration by stirring, this solution is sprayed at coke surface by 2% straying quatity of weight of coke, carry out reactivity and post-reaction strength mensuration by standard GB/T4000-1996, gained result and check sample contrast the results are shown in following table:

Sample is other	The thermal characteristics prescription
		CRI CSR boric acid silicon-dioxide
	Benchmark sample test sample a test sample c		30.89 54.85 0 0 25.74 61.04 100 0 27.61 63.79 80 20

Embodiment 6:

Take by weighing weight by the quality of pure substance and account for 70% boric acid, 30% silicon-dioxide uniform mixing, add water then, water temperature is controlled at 60-80 ℃, be mixed with the solution of 3.5% weight percent concentration by stirring, this solution is sprayed at coke surface by 2% straying quatity of weight of coke, carry out reactivity and post-reaction strength mensuration by standard GB/T4000-1996, gained result and check sample contrast the results are shown in following table:

Sample is other	The thermal characteristics prescription
		CRI CSR boric acid silicon-dioxide
	Benchmark sample test sample a test sample d		30.89 54.85 0 0 25.74 61.04 100 0 26.64 59.26 70 30

Claims (3)

1. a coke deactivator is characterized in that described coke deactivator is formed and content is boric acid 70～90%, and at the silicon-dioxide more than 98% 5～30%, all percentage ratios are weight percentage less than 500 orders, purity for a borax 0～10% and a material.

2. coke deactivator according to claim 1 is characterized in that described coke deactivator adds that to be mixed with weight percentage after water stirs be 1～4% the aqueous solution, and the described aqueous solution evenly is sprayed at coke surface by 1～5% straying quatity of weight of coke.

3. coke deactivator using method according to claim 1 and 2 is characterized in that the described aqueous solution evenly is sprayed at coke surface in the vaporific mode of flyover.