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Magnetizing roasting method for complex refractory mixed type iron ore

A technology of magnetization roasting and composite magnetization, applied in the fields of mineral processing and metallurgy, can solve the problems of poor magnetic separation index, complex magnetic separation process of mixed iron ore, high roasting and magnetic separation cost, achieve energy saving and emission reduction effect, reduce magnetization Roasting cost, the effect of easy promotion

Active Publication Date: 2017-09-01
GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0008] The purpose of the present invention is to provide a kind of magnetization roasting method of complex refractory mixed type iron ore, according to the mineral composition of mixed type iron ore, the mixed type iron ore with high siderite content is mixed with siderite content low or Mixed iron ore without siderite is subjected to composite magnetization roasting in a certain proportion to solve the problems of complex magnetic separation process, poor magnetic separation index and high cost of roasting and magnetic separation of mixed iron ore

Method used

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  • Magnetizing roasting method for complex refractory mixed type iron ore
  • Magnetizing roasting method for complex refractory mixed type iron ore
  • Magnetizing roasting method for complex refractory mixed type iron ore

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Embodiment 1

[0044] A magnetization roasting method for complex refractory mixed iron ore, comprising the following steps:

[0045] Step 1: Separate a certain mine The siderite content of the ore body is 20%, the total iron grade is 33.71%, and the mixed iron ore with the Ⅷ ore body siderite content of 5%, and the total iron grade is 32.48% are all crushed to 20mm;

[0046] Step 2: Weigh 20mm 200g of ore body iron ore is spread on the lower layer of the roasting tank, 200g of 20mm Ⅷ ore body iron ore is weighed and spread on the upper layer of the roasting tank, and the surface layer of the Ⅷ ore body iron ore is covered with 20g of semi-coke;

[0047] Step 3: Control the temperature of the box-type resistance furnace to 850°C, start roasting, and roast for 50 minutes;

[0048] Step 4: After the roasting is finished, take out the roasting tank, seal it with water and cool it to room temperature;

[0049] Step 5: The cooled mixed material is crushed and ground, and the grinding particl...

Embodiment 2

[0052] A magnetization roasting method for complex refractory mixed iron ore, comprising the following steps:

[0053] Step 1: Separate a certain mine The siderite content of the ore body is 20%, the total iron grade is 33.71%, and the mixed iron ore with the Ⅷ ore body siderite content of 5%, and the total iron grade is 32.48% are all crushed to 30mm;

[0054] Step 2: Weigh 30mm 500g of ore body iron ore and 500g of 30mm Ⅷ ore body iron ore, and then mix the two kinds of iron ore;

[0055] Step 3: Control the kiln temperature in the roasting section of the rotary kiln to 750°C, the rotating speed to 90s / r, the filling rate to 25%, and the roasting time in the high-temperature section to 20 minutes, and start roasting in the kiln;

[0056] Step 4: After all the roasted ore enters the cooling section of the rotary kiln, the power is turned off to cool down, and the cooling section is sealed and air-cooled before unloading;

[0057] Step 5: The cooled mixed material is crus...

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Abstract

The invention relates to a magnetizing roasting method for complex refractory mixed type iron ore. By means of the method, according to the mineral composition of the mixed type iron ore, weakly magnetic iron ore in the mixed type iron ore is converted into strong magnetic iron ore in the manner of mixing the mixed type iron ore high in siderite content with the mixed type iron ore low in siderite content or containing no siderite according to a certain ratio for compound magnetizing roasting, and iron ore concentrate high in iron grade and iron recycling index can be obtained from roasted ore through a conventional weakly magnetic separation process. The magnetizing roasting method can be suitable for coal-based reduction processes of tunnel kilns, rotary kilns and the like, no or a small quantity of reducing agent can be prepared in a roasted object in the magnetizing roasting technological process, and therefore the energy consumption of the roasting process is lowered.

Description

technical field [0001] The invention belongs to the technical fields of mineral processing and metallurgy, and in particular relates to a magnetization roasting method for complex and refractory mixed iron ore. Background technique [0002] There are few rich iron ores and more lean iron ores in my country. 97% of the iron ore is low-grade iron ore with less than 30% iron ore, and there are still a large number of complex and difficult-to-separate mixed iron ores that have not been developed and utilized in China. [0003] Since entering the 21st century, the demand for iron ore resources has been gradually increasing, which has put my country's iron and steel industry under enormous pressure. The risk of the world iron ore market has great practical significance and far-reaching historical significance. [0004] At present, my country's complex and refractory mixed iron ore mainly has the following three disposal methods: [0005] 1. Only the strong magnetic iron minerals ...

Claims

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Application Information

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IPC IPC(8): C22B1/02
CPCC22B1/02
Inventor 雷鹏飞寇明月展仁礼张红军王建平靳建毅王宁丁凯
Owner GANSU JIU STEEL GRP HONGXING IRON & STEEL CO LTD
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