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High-concentration iron-based flocculant and production method thereof

A production method and flocculant technology, which are applied in separation methods, chemical instruments and methods, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of poly free sulfuric acid and reaction residues, prolonged production time of polyferric sulfate solution, etc. The effect of shortened production time, reduced product transportation cost, high dewatering performance

Pending Publication Date: 2022-05-10
NITTETABU MINING CORP
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  • Claims
  • Application Information

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Problems solved by technology

[0014] As described above, in conventional techniques, although attempts have been made to produce polyferric sulfate solutions by selecting various iron compounds as iron-based raw materials and reacting them in various reaction forms, there are still problems including the generation of much free sulfuric acid and reaction residues. problem, there is also the problem of prolonging the production time of producing the practically used polyferric sulfate solution

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  • High-concentration iron-based flocculant and production method thereof
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  • High-concentration iron-based flocculant and production method thereof

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Embodiment Construction

[0035] Here, before describing the technical features of the production method of the iron-based flocculant according to the present invention, the inorganic flocculant will be described first.

[0036] Generally, in sewage sludge treatment, suspended particles and colloidal particles in the sludge are flocculated with a flocculant, and dewatering treatment and solid-liquid separation are performed. Suspended and colloidal particles in sewage sludge are usually negatively charged on their surfaces and are in a stable state due to the repulsive force and hydration of the surface charges. Flocculants are chemicals that adsorb on the surfaces of these particles to neutralize surface charges and weaken the repulsive forces between the particles to thereby flocculate the particles.

[0037] Iron-based flocculants are typical inorganic flocculants, and positively charged iron ions neutralize negative charges on the surface of suspended matter such as suspended particles and colloida...

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Abstract

According to the present invention, it is possible to produce in a short time an ultra-high concentration polymeric ferric sulfate solution which cannot be produced by a conventional production method due to a long reaction time. When the sulfate ion concentration is [SO4 < 2->] and the total iron concentration is [T-Fe] (in terms of molar concentration), the raw material is adjusted so that the following relationship is satisfied, and the polyferric sulfate solution is produced by a high-temperature and high-pressure reaction of the raw material. The molar ratio of sulfate ions to total iron (SO4 < 2-> / T-Fe) is at least 1.2, and when the weight concentration of sulfate ions is [SO4 < 2->], [SO4 < 2->] is at most 35 wt%.

Description

technical field [0001] The present invention relates to a high-concentration iron-based flocculant for wastewater treatment, and a production method thereof. Background technique [0002] The applicant of this patent application sells wastewater treatment chemicals centered on the iron-based inorganic polymer flocculant "Polytetsu" (registered trademark) that was originally developed, and holds a number of related patents. [0003] Among these patents, Patent Document 1 describes adding sodium nitrite as a catalyst and an oxidizing agent to ferrous sulfate (FeSO4) as an iron-based raw material 4 ), and caused an oxidation reaction to proceed at normal temperature and normal pressure for about 10 hours, thereby obtaining polymerized ferric sulfate ([Fe 2 (OH) n (SO 4 ) 3-n / 2 ] m , where 0<n≤2, and m is a natural number) solution. [0004] However, since this method requires a long reaction time, it is required to shorten the reaction time by some means. [0005] The...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G49/14C02F1/52
CPCC01G49/14C02F1/5236B01D21/01
Inventor 桂洋介伴正宽户岛达郎中岛正贵
Owner NITTETABU MINING CORP