年产10万吨还原铁成套生产线，回转煅烧窑详细介绍

鑫虎一步法回转窑 还原铁热压块(HBI)生产工艺

 Production Process of Reduced Iron Hot-pressing Block (HBI)

用天然气或煤气做热源的回转窑还原技术+热压成型钝化机压块是我公司 新研发生产还原铁热压块新工艺技术，新工艺节能环保，已经申报国家发明 zhuan  li。我公司研发的回转窑+热压成型钝化工艺，与传统工艺有了很大改进，用天然气或煤气做热源，用CO气体和无烟煤做还原剂，不但回转窑操作变得简单，回转窑结圈几率降低，运行更可靠，同时由于增加了热压成型钝化系统， 大限度防止了再氧化和利用了余热，降低了能耗和生产成本。

Rotary kiln reduction technology with natural gas or gas as heat source and passivator pressing block by hot pressing are the latest research and development of new technology for producing reduction iron hot pressing block by our company. The new technology is energy-saving and environmental protection, and has declared the national invention patent. It not only makes rotary kiln operation easy, Rotation kiln ringing rate becomes lower and the operation is more reliable. At the same time, due to the addition of passivation system for hot pressing forming, the waste heat is maximally utilized, and the energy consumption and production cost are reduced.

该工艺主要针对铁矿粉或氧化铁皮进行还原，所用原料有铁矿粉（氧化铁皮）、还原剂（CO+无烟煤）及脱硫剂。主要设备包括配料压球系统、烘干加热系统、二次燃烧室系统、回转窑还原系统、热压成型钝化系统、尾气抽风净化系统、喷煤系统和循环水冷却系统等。

The process is mainly aimed at reducing iron ore powder or oxide scale. The raw materials used are iron ore powder (oxide scale), reducing agent (CO + anthracite) and desulfurizer. The main equipments include batching and ball-pressing system, drying heating system, secondary combustion chamber system, rotary kiln reduction system, hot pressing passivation system, exhaust air purification system, coal injection system and circulating water cooling system etc.

主要工艺流程是铁粉、氧化铁皮、粘结剂按一定比例混合后，通过皮带机输送到强制混料机中，经过强制搅拌混合的料通过皮带机进入储料仓中，储料仓4个，下面安装有圆盘给料机，可根据压球机产量调节圆盘给料机给料量，铁粉料通过皮带机加到压球机中，压球机压好的球，通过皮带机进入链板式烘干机中。铁粉球在链板式烘干机中被来自烧结回转窑的热风烘干加热，二次燃烧室排出的高温尾气直接进入烧结回转窑，烧结回转窑烧结的球团,温度高达11０0℃，密闭送进还原回转窑中进行加热还原，经回转窑还原的高温还原球团在窑头出料口进行筛分，筛下物加湿降温后有螺旋上料机排出，费焦经处理后，颗粒料可以继续使用。筛上的热还原球团经压块机进行热压钝化处理， 终出还原铁热压块（HBI）产品。

The main process is that after mixing iron powder, iron oxide scale and binder in a certain proportion, the material is conveyed to the forced mixer through belt conveyor. After forced mixing, the material is entered into the storage bin through belt conveyor. There are four storage silos with disc feeders installed below. The feeding quantity of disc feeder can be adjusted according to the output of ball press. Iron powder is added to the ball press through belt conveyor. The ball pressed by the machine enters the chain plate dryer through the belt conveyor. Iron powder pellets are heated by hot air drying from sintering rotary kiln in chain plate dryer. The high temperature tail gas from secondary combustion chamber enters sintering rotary kiln directly. The sintered pellets in sintering rotary kiln are fed to reduction rotary kiln at a temperature as high as 1100 C. The high temperature reduction pellets reduced by rotary kiln are screened at the outlet of kiln head, and the sieve material is humidified and cooled. The screw feeder discharges the coke, after treatment, the granular material can continue to use. The hot reduction pellets on the sieve were passivated by hot pressing with a compactor, and the reduced iron hot pressing block (HBI) product was finally produced.

2、设备工艺布置图

 Equipment Process Layout