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Technique and system for preparing fine iron powder from siderite
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A technology of refined iron powder and siderite, which is applied in the field of comprehensive utilization of ferrous metal resources, can solve problems such as unsatisfactory and incapable of large-scale application
Inactive Publication Date: 2015-02-11
新疆蓝天镁业股份有限公司
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Problems solved by technology
However, after years of practice, it has been shown that the above methods are not satisfactory and cannot be applied on a large scale, resulting in most siderite mines being idle
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Embodiment 1
[0034] The sample comes from siderite mine in Shanshan County, Xinjiang, and its content is:
[0035] Single element Fe Al Ca Mg Si
[0036] Content (%) 40.31 0.283 3.39 1.28 1.125
[0037]In the embodiment, 1000 kg of siderite is crushed to 10 mm with a jaw crusher, then enters the acid leaching tank, and then adds 20% concentration hydrochloric acid according to the theoretical ratio, 60 ° C, 3.11 m3, and the reaction temperature is 60 ° C About 1.5 h for leaching reaction. After the reaction is over, pump it into a plate-and-frame filter press for pressure filtration. The filtered solution is analyzed, and the filter cake enters the slurry tank. Among them, the result of acid leaching is: solution volume is 2.98 m3, slag weight (dry): 40 kg
[0038] Analysis is as follows: in liquid phase: Fe=137.1 g / L; Ca=3.3 g / L; Mg=2.73 g / L; Si=0g / L; Al=0.05 g / L; in solid phase: Fe=3.625%; Ca=1.50%; Mg=0.22%; Si=33.0%; Al=0.3%;
[0039] Leaching rate:
[0040] Element Fe Al Ca Mg S...
Embodiment 2
[0043] The solution enters the pre-concentrator for concentration, where the temperature of the flue gas after the hydrolysis is 400°C, and the gas content (volume fraction %) is: HCl, 8.63%; H 2 O, 43.31%; N2, 38.75%; CO 2 , 7.46%. After contact, the volume of the solution shrinks by 30%, and the concentration is 1.2 times of the original. The gas content (mass fraction%) after contact is: HCl, 5.68%; H 2 O, 53.38%; N2, 33%. The solution enters the roasting furnace for high-temperature roasting, and the gas generator is a first-stage gas generator, which generates hot dirty gas at 450°C. The bottom of the hydrolysis roasting furnace is 700°C, and the top of the furnace is 400°C. The content of the refined iron powder after the reaction is:
[0044] Single element Fe Al Ca Mg
[0045] Content (%) 66.5 0.01 1.35 0.28
[0046] Wherein the one-time recovery rate of iron is 91%.
Embodiment 3
[0048] The pre-concentrated gas enters the hydrochloric acid absorption tower for absorption, and the hydrochloric acid content in the regenerated acid is 18.10%. Among them, the gas composition after the absorption tower: HCl, 0.02%; H 2 O, 53.21%; N 2 : 37.3%; CO 2 , 7.26%.
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Abstract
The invention discloses a process for preparing refined iron powder from siderite and its system. The process comprises the following steps: crushing the siderite and circulating hydrochloric acid as raw materials for acid leaching; filtering the product after acid leaching, and performing slurry washing on the filter cake , the pickling solution enters the pre-concentrator and contacts the high-temperature flue gas after hydrolysis, and the solution is concentrated and then enters the hydrolysis system for high-temperature hydrolysis. Collect the produced powder and the recovered material from the cyclone dust removal as refined iron powder product. The gas enters the pre-concentrator to cool and then enters the absorption tower for absorption. The concentration of hydrochloric acid finally reaches 18-20%. The gas after the absorption tower is finally absorbed by supplementary water, the absorbed solution washes the acid leaching residue, and the filtered filtrate returns to the absorption tower to absorb HCl. The invention also provides a system for realizing the method. In the whole technological process of the present invention, there is only hydrochloric acid circulation process, which is an environment-friendly cleaning process.
Description
technical field [0001] The invention relates to a process for preparing fine iron powder from siderite and a system thereof, belonging to the field of comprehensive utilization of ferrous metal resources. Background technique [0002] my country's siderite resources are very rich. At present, the proven reserves are 1,833.76 million tons, accounting for 14% of the total proven iron ore reserves, and another 1,821.09 million tons are reserved. It is mainly distributed in several provinces such as Yunnan, Shaanxi, Gansu, Qinghai and Xinjiang. In these areas, siderite resources generally account for more than half of the province's total iron ore reserves, and have the characteristics of long geological age of deposits, many ore-bearing layers, wide distribution area and large reserves. Among them, the reserves of siderite deposits in five provinces including Xinjiang, Qinghai, Gansu, Shaanxi and Yunnan are more than 100 million tons, and the reserves of Daxigou siderite depos...
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