Purification method of semi-finished ferrite product containing chromium and nickel
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A purification method and ferrite technology are applied in the field of recycling and utilization of heavy metal ions, which can solve problems such as pollution, and achieve the effects of realizing economic value, eliminating pollution and reducing energy consumption in production.
Inactive Publication Date: 2010-10-06
松阳县环境监测站
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This kind of behavior has certain benefits to environmental protection, but there are still quite serious pollution phenomena
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Embodiment 1
[0037] Stainless steel pickling waste water sludge, through preliminary treatment, obtains ferrite semi-finished product containing chromium and nickel, wherein content (mass content) is roughly as follows: Fe 2 o 3 80-85%, Cr 2 o 3 10-15%, NiO 1-4%.
[0038] (1) Acid leaching process: Put 3 tons of ferrite semi-finished products containing chromium and nickel (solid content is about 30%) into the acid leaching reaction tank every day, then add 98% concentrated sulfuric acid, about 1.8 tons per day, until the acid leaching In the reaction tank, adjust the PH value to 2.8 and let it stand still; soak it fully so that Fe, Cr, and Ni metals all exist in the acid solution in an ion state;
[0039] (2) Precipitation process: the solution through the acid leaching process is sent to the neutralization reaction tank, and adding mass concentration in the neutralization reaction tank is 28% ammoniacal liquor, 5 tons per day, to adjust the pH value of the solution in the neutraliza...
Embodiment 2
[0045] Test according to the process carried out in embodiment 1,
[0046] In engineering test one, the acid leaching reaction pool was adjusted to 2.5 in pH value,
[0047] In engineering test one, the acid leaching reaction pool was adjusted to 2.6 in pH value,
[0048] In engineering test one, the acid leaching reaction pool was adjusted to 2.7 pH value,
[0049] Finally, multi-component ferrite can be obtained, and the components are as follows:
[0050]
[0051] The quality of the ferrite prepared in the present invention meets the national industrial level requirements.
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Abstract
The invention relates to a chemical purification method, in particular to a method for recovering heavy metal ions in an environmental protection process. The method comprises the following steps of: adding 98% concentrated sulfuric acid into an acid leaching reactor; adjusting a pH value to 2.5-2.8; them, carrying out a neutralization reaction with ammonia until the pH value of the solution is 4.3; and carrying out the processes of filtering, washing, filter pressing and the like to obtain a finished ferrite product. Byproducts can be processed by an all-in-one ion exchanging machine to obtain chromium sulfate, nickel sulfate and ammonium sulfate for different purposes. The invention has little production energy consumption, not only can change waste into valuables to achieve economic benefit, but also can eliminate environmental pollution caused by heavy metals in mud. The invention can be widely applied to enterprises of producing stainless steel to improve economic benefits and social benefits.
Description
technical field [0001] The invention relates to a chemical purification method, in particular to a method for recycling heavy metal ions in the environmental protection wastewater treatment process. technical background [0002] Ferrite is a kind of Fe-containing 2 o 3 of metal oxides. The resistivity of ferrite is much larger than that of metal and alloy magnetic materials, and it also has high dielectric properties, so it is widely used. Moreover, high-purity ferrite can be combined with various heavy metals to form different magnetic materials, etc., and has a wide range of uses in the fields of electronics, communications, and environmental protection. [0003] In the 1990s, my country has become a major producer of ferrite magnetic materials. The oxides of iron (mainly Fe 2 o 3 ) demand has greatly increased, and the ferrite obtained after the aforementioned process steps can simulate natural iron ore and be used as a raw material for manufacturing various types of...
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