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Preparation method of potassium ferrate

A technology of potassium ferrate and potassium hypochlorite, applied in chemical instruments and methods, iron compounds, inorganic chemistry and other directions, can solve the problems of long time consumption, low success rate, and difficulty in eliminating potential safety hazards, and achieves reduction of environmental pollution and production cycle. Short, fast-response effects

Active Publication Date: 2011-01-26
安徽富通环保节能科技股份有限公司
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Problems solved by technology

In addition to the extremely high cost of the sodium peroxide method, it is difficult to eliminate potential safety hazards during the experiment, and the technical conditions are harsh. (For example, porcelain crucibles cannot be used, etc.) It is difficult to industrialize. The potassium nitrate method and the electrolysis method are both dry processes, and both have a success rate Common problems such as low cost and long time consumption are difficult to be accepted by users
[0011] Due to the immature preparation process at present, there are almost no industrial-grade products of potassium ferrate on the market.

Method used

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Embodiment Construction

[0023] Such as figure 1 As shown, the method for preparing potassium ferrate of the present invention includes the following steps:

[0024] Step 1. Mix the NaOH and NClO solutions in the reactor, add dropwise iron nitrate Fe(NO 3 ) 3 Solution, the best condition for preparing potassium ferrate is that the mass concentration of NaClO (potassium hypochlorite) is 270g / L, Fe(NO 3 ) 3 The mass concentration is 330g / L;

[0025] Step 2. The optimal oxidation reaction temperature for preparing potassium ferrate is 26°C;

[0026] Step 3. The optimal oxidation reaction time for preparing potassium ferrate is 1.5h;

[0027] The reaction formula is:

[0028] 3NaClO+2Fe(NO 3 ) 3 +10NaOH=2Na 2 FeO 4 +3NaCl+6NaNO 3 +5H 2 O

[0029] Na 2 FeO 4 +2koH=K 2 FeO 4 +2NaOH

[0030] Step 4. The crude potassium ferrate is recrystallized and washed with isopropanol;

[0031] Step 5. The washed crystals are dried under vacuum conditions, the vacuum degree is controlled to 80KPa, and the drying temperature is 70°C;...

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Abstract

The invention discloses a preparation method of potassium ferrate, which comprises: mixing solution of NaOH and solution of NaClO in a reaction kettle; dripping solution of [Fe(NO3)3], stirring and reacting for 1 to 2 hours; regulating the reaction concentration and pH value, precipitating the potassium ferrate (Na2Fe3O4) from the reacting solution and filtering; adding the Na2Fe3O4 filtered out into solution of potassium hydroxide (KOH); filtering after the Na2Fe3O4 dissolves; slowing dripping saturated solution of KOH into the solution to precipitate the coarse product of Na2Fe3O4; and recrystallizing, washing with isopropanol, and drying under vacuum under conditions of a temperature of 70 DEG C and a pressure of 80KPa to obtain a pure product. The preparation method has the advantages of high production speed, high product purity (as high as over 94 percent), mother liquor recycling, great reduction in energy consumption, light environmental pollution, low cost and the like.

Description

Technical field [0001] The invention relates to the field of chemical production, in particular to a method for preparing potassium ferrate. Background technique [0002] The molecular formula of potassium ferrate is: K 2 FeO 4 It is a multifunctional water treatment agent that can effectively remove metal ions in wastewater. See Table 1: [0003] ion Optimal PH value K 2 FeO 4 / mg.L -1 Processing time (min) Removal rate% S2- 5.95 45 8>95 CN - 11.2 75 10>99 Pa 2+ 7.6 60 7>95 Cd 2+ 7.6 50 7 >99 Cu2+ 7.3 55 6>95 Cr3+ 7.5 55 8>95 Large intestine rod bacteria 0.5 2>99 [0004] Table 2: Treatment of potassium ferrate and other mixed flocculants and oxidants [0005] Comparison of the effects of an industrial wastewater [0006] deal with method Dosing quality concentration (mg / L) PH value Chroma SS COD cr BOD 5 Before processing 5.4 328 275 2318 741 Polyaluminum su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/00
Inventor 邹益坚刘炳焕
Owner 安徽富通环保节能科技股份有限公司
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