CN104775023A - Manufacturing method for cold-pressed pellets for steelmaking - Google Patents

Abstract

A manufacturing method for cold-pressed pellets for steelmaking comprises the manufacturing technological steps that (1) steelmaking secondary fly ash, converter mud and oxide scale are mixed in advance with the weight ratio of (20-23):(55-65):(10-20), and evenly stirred into a mixture; (2) a binder is prepared through water-soluble sodium carboxymethycellulose and industrial effluent at the weight ratio of 1:(15-50) for standby application; (3) a magnesium chloride solution is prepared by magnesium chloride hexahydrate and water at the weight ratio of 1:1 for standby application; (4) 3%-5% of binder and 0.5%-1.5% of magnesium chloride solution are added in the mixture, mixing is carried out by an edge runner mill for 100-150 s, and a pellet material is made; (5) the pellet material is put into a ball press machine to achieve cold-press formation, the diameter of the pellets is 45-55 mm*30-40 mm *20-30 mm, and the pellets are naturally stacked and aired. The cold-pressed pellets manufactured through the method have the advantages that the pellet forming rate is high, the bonding strength is large, the drying time is short after pellet formation, and use for steelmaking is convenient.

Description

A kind of making method using coal-pressing ball of making steel

Technical field

The invention belongs to steelmaking technical field, be specifically related to a kind of making method using coal-pressing ball of making steel.

Background technology

Produce dust in iron and steel enterprise's smelting process, these dust become dedusting ash after being collected by fly-ash separator.The comprehensive use of dedusting ash is an important topic of recycling economy research always.Under present circumstances, the treatment process of dedusting ash returns sintering system recycling and makes the modes such as coal-pressing ball.Making coal-pressing ball is the good environmental protection treatment approach processing dedusting ash at present, can solve the object that environmental issue reaches energy-saving and cost-reducing simultaneously preferably.Because utilize dedusting ash to make the mode of coal-pressing ball compared to returning sintering system recycling mode, decrease the airborne dust problem in sintering process; Meanwhile, coal-pressing ball is directly used in steel mill's converter smelting and plays cooling, changes slag effect, has played the utility value of dedusting ash.Therefore, in coal-pressing ball, the quality of binding agent used has been directly connected to the quality of coal-pressing ball.Current most cooled agglomerated pellet production and application wilkinite and cement as binding agent, not only early stage intensity difference, balling ratio is low, curing cycle is long, and in later stage use procedure, steelmaking system produces a large amount of waste residues, makes post-processed produce certain difficulty.

Summary of the invention

The object of the present invention is to provide a kind of making method using coal-pressing ball of making steel.Adopt new combination caking agent to be used for coal-pressing ball to produce, what can improve coal-pressing ball phase before manufacture anti-fell intensity and later stage anti-ly fall, ultimate compression strength, binding agent main component is at high temperature burnt, and sub-fraction has the effect of dissolving agent and furnace retaining.

The technical scheme of invention:

Make steel by the making method of coal-pressing ball, with the material adding additives making of steel-making secondary dedusting ash, revolving furnace mud, iron scale mixing.Described steel-making secondary dedusting ash contains Fe=68% ~ 71% containing Fe=5% ~ 45%, revolving furnace mud containing Fe=48% ~ 60%, iron scale; Industrial effluent is the tail washings after sugarcane refines sugar, wherein sugar 18 % ~ 20%, solid substance 52 % ~ 55 %, density 1.28 ~ 1.30.Manufacturing process steps comprises:

(1) with steel-making secondary dedusting ash, revolving furnace mud, iron scale according to weight ratio (20 ~ 23): (55 ~ 65): (10 ~ 20) are pre-mixed, and are stirred into mixture.

(2) by water-soluble carboxymethyl sodium cellulosate and industrial effluent by weight 1: it is for subsequent use that (15 ~ 50) are configured to binding agent;

(3) magnesium chloride hexahydrate and water is for subsequent use by weight 1: 1 wiring solution-forming magnesium chloride solution.

(4) in mixture, add the binding agent of 3% ~ 5%, the magnesium chloride solution of 0.5% ~ 1.5%, then by wheel roller mixing 100 ~ 150s, make ball material.

(5) ball material is injected ball press coldmoulding, pelletizing diameter is 45 ~ 55 mm × 20 ~ 30, mm × 30 ~ 40 mm, naturally stacks and dries.

The characteristic that the present invention utilizes industrial effluent intrinsic, improves intensity in early stage; The alkaline matter formation temperature in the acidity of magnesium chloride and industrial effluent and iron-containing waste is used to play the effect of drying pelletizing; The polymer characteristics of carboxymethyl cellulose is used to play the effect promoting the ultimate performance of pelletizing.Experiment proves, the coal-pressing ball made by the inventive method, and its ultimate intensity >=700N resists and falls intensity >=7.0(0.5m), moisture≤4%, this coal-pressing ball obtains good result in Smelting Practice.The present invention is with existing Technical comparing, not only have that balling ratio is high, cohesive strength be large, after balling-up time of drying short, be convenient to smelt iron the advantage used, utilize coal-pressing ball self-heating simultaneously, heating temp controls at 50 ~ 60 DEG C, greatly can shorten curing time, reduce stoving process and the expense of later stage ball, reduce moisture content in coal-pressing ball.Binding agent in coal-pressing ball burns in molten steel high temperature, and magnesium salts is of value to the change slag of converter body and slag.Use that present device technique is simple, cost is low, balling ratio is high, curing time controllable, not limit by place.

Embodiment

Content of the present invention is further illustrated below in conjunction with embodiment

Embodiment 1:

(1) use steel-making secondary dedusting ash, revolving furnace mud, iron scale to be pre-mixed according to the ratio of 22: 60: 18, be configured to total 300 kg mixture.

(2) water miscible Xylo-Mucine (CMC) 300g is dissolved in 12 kg industrial effluent stirs, be mixed with binding agent.

(3) magnesium chloride solution is prepared.By magnesium chloride hexahydrate and water by weight 1: 1 ratio be made into 5 kg solution for standby.

(4) 12 kg binding agents are added toward mixture, add magnesium chloride solution 4 kg, again pass through planetary type wheel mill by mixing of materials 120s, enter in GY650-220C ball press shaping, compacting coal-pressing ball diameter is 50mm × 35mm × 24mm, naturally stacks and dries 72H.

After testing, obtained coal-pressing ball ultimate compression strength is 812 N, and anti-to fall intensity be 9.2 0.5m.

Embodiment 2:

(1) use steel-making secondary dedusting ash, revolving furnace mud, iron scale to be pre-mixed according to the ratio of 25: 63: 12, be configured to total 300 kg mixture.

(2) water miscible Xylo-Mucine (CMC) 300 g is dissolved in 12 kg industrial effluent stirs, be mixed with binding agent.

(3) magnesium chloride solution is prepared.Magnesium chloride hexahydrate and water are made into 5 kg solution for standby according to the ratio of weight 1: 1.

(4) binding agent 12 kg is added toward mixture, add magnesium chloride solution 4 kg, again pass through planetary type wheel mill by mixing of materials 120S, enter in GY650-220C ball press shaping, compacting coal-pressing ball diameter is 50mm × 35mm × 24mm, naturally stacks and dries 72H.

After testing, obtained coal-pressing ball ultimate compression strength is 794 N, and anti-to fall intensity be 8.9 0.5m.

Embodiment 3:

(1) use steel-making secondary dedusting ash, revolving furnace mud, iron scale to be pre-mixed according to the ratio of 23: 63: 14, be configured to total 300 kg mixture.

(2) water miscible Xylo-Mucine (CMC) 300g is dissolved in 12 kg industrial effluent stirs, be mixed with binding agent.

(3) magnesium chloride solution is prepared.By magnesium chloride hexahydrate and water by weight 1: 1 ratio be made into 5 kg solution for standby.

(4) binding agent 10 kg is added toward mixture, add magnesium chloride solution 4 kg, again pass through planetary type wheel mill by mixing of materials 120S, enter in GY650-220C ball press shaping, compacting coal-pressing ball diameter is 50mm × 35mm × 24mm, naturally stacks and dries 72H.

After testing, obtained coal-pressing ball ultimate compression strength is 843 N, and anti-to fall intensity be 9.7 0.5m.

Claims (1)

1. make steel by the making method of coal-pressing ball for one kind, make of the material adding additives of steel-making secondary dedusting ash, revolving furnace mud, iron scale mixing, described steel-making secondary dedusting ash contains Fe=48% ~ 60%, iron scale containing Fe=68% ~ 71% containing Fe=5% ~ 45%, revolving furnace mud; Industrial effluent is the tail washings after sugarcane refines sugar, wherein sugar 18% ~ 20%, solid substance 52 % ~ 55 %, density 1.28 ~ 1.30, and manufacturing process steps comprises:

(1) with steel-making secondary dedusting ash, revolving furnace mud, iron scale according to weight ratio (20 ~ 23): (55 ~ 65): (10 ~ 20) are pre-mixed, and are stirred into mixture;

(2) by water-soluble carboxymethyl sodium cellulosate and industrial effluent by weight 1: it is for subsequent use that (15 ~ 50) are configured to binding agent;

(3) magnesium chloride hexahydrate and water is for subsequent use by weight 1: 1 wiring solution-forming magnesium chloride solution;

(4) in mixture, add the binding agent of 3% ~ 5%, the magnesium chloride solution of 0.5% ~ 1.5%, then by wheel roller mixing 100 ~ 150s, make ball material;

(5) ball material is injected ball press coldmoulding, pelletizing diameter is 45 ~ 55 mm × 20 ~ 30, mm × 30 ~ 40 mm, naturally stacks and dries.