CN1330158A - Process for preparing abradant to derust steel slegs of converter - Google Patents

Abstract

A process for preparing the abradant for derusting steel slags of converter includes such steps as supplementing water, regulating water level in water pool, turning on draught fan, opening air throttle and by-pass valve, closing drum valve, opening a set of water pump and electric valve, turning on chain-plate convayer, checking the flowability of slags, opening air throttle, loading slags in drum, closing by-pass valve, stopping supply of water and opening by-pass valve.

Description

The derusting abrasive medium production technique of bessemer furnace slag

What the present invention relates to is a kind of derusting abrasive medium production technique of derusting abrasive medium production technique, particularly a kind of bessemer furnace slag, belongs to the slag field of metallurgy profession.

Slag all is considered to important environomental pollution source for a long time, though, aspect the slag comprehensive development and utilization, bigger progress is being arranged both at home and abroad at present, for example: the powder slag returns sintering and utilizes, as one of cement producting material, be used for that the road azulejo is made and as bituminous concrete aggregate or the like, but eventually because of the market expense less than the slag generation, therefore, Multipurpose Utilization of Steel Slag just need be developed new product, and with the expense that opens up a market, solves environmental issue.A large amount of both at home and abroad now derusting abrasive mediums that use are mainly based on shot, shot, steel wire ball, copper mine slag etc., though these abrasive materials all have effect preferably aspect compressed-air blast cleaning, but very expensive, the cost input is bigger, and applying unit is difficult to obtain favorable economic benefit.As by literature search, the slag treatment technology is abroad also arranged, comprising: America and Japan's moral, and Russia, but still find no the report identical so far with the technology of the present invention theme.

The objective of the invention is to utilize bessemer furnace slag to produce derusting abrasive medium technology smelts and the equipment of slag treatment and the actual national conditions of processing condition in conjunction with China tightly, under the extremely low situation of cost input, overcome deficiency of the prior art, a kind of derusting abrasive medium production technique of bessemer furnace slag is provided.

Technical scheme of the present invention and implementation method are described below: the steel ball liquid towards slag under the processing method that the present invention determines that utilizes the cylinder body interior to roll carries out the chilling that attrition crushing and the cooling provision of spraying water are finished melt cinder; make it continuous production by drum-type structure; hot slag charge cools off rapidly between the spheroid of cylinder, granulation, and the cylinder bus adopts the glazing bar form to finish the discharge of slag.

Processing method of the present invention is divided into three operation stages to be implemented, and the fs prepares for the cylinder operation, and subordinate phase is the rollers running operation, and the phase III is the slag processing operation, and specific implementation method is as follows:

One, the cylinder operation is prepared:

1. close switch valve, handle moisturizing to slag,

2. the water level of adjusting the pond reaches 3/4,

3. adjust the equipment oil level, water coolant, electrical equipment is normal,

4. adjust the induced draft fan air door and be in zero-bit,

Two, rollers running operation:

1. start induced draft fan, observe current value, about about 140A, control current turns round more than the 30s below 250A,

2. open air door about 10%, observe size of current, if electric current surpasses 250A, necessary hard stop,

3. by-pass valve opens 100%, and the cylinder valve cuts out,

4. open one group of water pump and motorized valve, check flow, bypass flow should be about 80T～90T,

5. start drag conveyer, start cylinder, rotating speed from slow to fast, to about 3 revolutions per seconds,

Three, slag processing operation:

1. confirm that bits are the slag of good fluidity,

2. open air door about 20%,

3. deslagging begins to open about cylinder valve to 10% after 10 seconds, closes by-pass valve, confirms that water enters cylinder,

4. observe the water yield that enters cylinder, be controlled at about 50T/h,

5. deslagging finishes the back and observes the induced draft fan electric current, closes about air door to 10%, about the about 170A of current value, cuts off the water, and opens by-pass valve, finds little blast, suitably improve about rotating speed to 4 revolutions per second,

6. not slagging tap promptly stops rollers running, stops the transfer roller running after 30 seconds, opens change-over switch,

7. note the situation of slagging tap, it is unimpeded that discharge port keeps, and finds the discharge port accumulated slag, in time removes.

After the 120T driving was poured 1500 ℃ liquid steel slag in the slag ladle cylinder body of 8 meters of diameters into along the charging chute, along with the rotation of body, inner steel ball was 40-50 ton/m through inflow-rate of water turbine after slag is carried out the rolling friction fragmentation ³Water spray cooling, by glazing bar gap seepage, under the effect of rotary drum flight, the bits of seepage are turned to the discharging chute top by cylinder bottom, be transported to by chute and be discharged into the grain slag field on the apron conveyor.The ability of roller process is 5 tons/minute, control by frequency transformer, its rotating speed is regulated in 0-5 rev/min of scope, made bits granularity after the processing on average below 10mm, the slag temperature below 70 ℃ again through cracking and sorting, obtain the abrasive material of particle diameter less than 5mm, through sampling analysis, bits FCaO content is few, and water swelling is little, performance is highly stable, can directly use.

The present invention has substantive distinguishing features and marked improvement, and its outstanding advantage is the national conditions that are embodied in conjunction with China's smelting and slag treatment, and the input of equipment cost is 1/5～1/10 of America and Japan's moral, is Muscovite about 1/4.The abrasive material of being produced does not contain free silica, no silicosis harm, this is that China uses nature sand (yellow sand, quartz sand) as the compressed-air blast cleaning abrasive material can't be obtained for a long time, and the present invention and shot, shot, steel wire ball, copper mine slag, natural sand facies be the best than performances such as, degree of cleaning that steel surface is handled, roughness.Therefore, the steel construction compressed-air blast cleaning of boats and ships, machinery, factory building etc. can be widely used in, coating derusting processing requirements at different levels can be reached.Its selling price is significantly less than other derusting abrasive mediums, and abrasive material energy second stage employ, the powder material also can be recycled to the cement mill, sintering plant utilizes again, the a large amount of castaway slags that produce in steelmaking process for steelworks provide a good outlet, and have produced good social, economy and environmental benefit.

Claims (1)

1, a kind of derusting abrasive medium production technique of bessemer furnace slag, it is characterized in that processing method is divided into three operation stages and implements, the fs prepares for the cylinder operation, and subordinate phase is the rollers running operation, phase III is the slag processing operation, and specific implementation method is as follows:

One, the cylinder operation is prepared:

1. close switch valve, handle moisturizing to slag,

2. the water level of adjusting the pond reaches 3/4,

3. adjust the equipment oil level, water coolant, electrical equipment is normal,

4. adjust the induced draft fan air door and be in zero-bit,

Two, rollers running operation:

1. start induced draft fan, observe current value, about about 140A, control current turns round more than the 30s below 250A,

2. open air door about 10%, observe size of current, if electric current surpasses 250A, necessary hard stop,

3. by-pass valve opens 100%, and the cylinder valve cuts out,

4. open one group of water pump and motorized valve, check flow, bypass flow should be about 80T～90T,

5. start drag conveyer, start cylinder, rotating speed from slow to fast, to about 3 revolutions per seconds,

Three, slag processing operation:

1. confirm that bits are the slag of good fluidity,

2. open air door about 20%,

3. deslagging begins to open about cylinder valve to 10% after 10 seconds, closes by-pass valve, confirms that water enters cylinder,

4. observe the water yield that enters cylinder, be controlled at about 50T/h,

5. deslagging finishes the back and observes the induced draft fan electric current, closes about air door to 10%, about the about 170A of current value, cuts off the water, and opens by-pass valve, finds little blast, suitably improve about rotating speed to 4 revolutions per second,

6. not slagging tap promptly stops rollers running, stops the transfer roller running after 30 seconds, opens change-over switch,

7. note the situation of slagging tap, it is unimpeded that discharge port keeps, and finds the discharge port accumulated slag, in time removes.