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Production technology of sponge iron for water purifying agent

A production process, technology of sponge iron, applied in the direction of water pollutants, water/sewage treatment, biological water/sewage treatment, etc., can solve the problem of poor spontaneous micro-electrolysis function, low pollutant removal efficiency, low C content of sponge iron, etc. problem, to achieve the effect of improving spontaneous micro-electrolysis function, high specific surface energy, and improving reaction efficiency

Active Publication Date: 2018-03-23
WUHAN COSRED SCI & TECH LTD
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  • Abstract
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Problems solved by technology

[0010] At present, sponge iron is a new type of zero-valent iron material in the field of water treatment, mainly derived from industrial sponge iron; it has the characteristics of high metallization rate and low impurity content, but there are problems such as the strength of sponge iron and the crystallization degree of reduced iron grains At the same time, the low C content in sponge iron, less activated carbon components, and poor spontaneous micro-electrolysis function lead to low surface energy, easy pulverization, and low removal efficiency of pollutants in industrial sponge iron during water treatment.

Method used

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  • Production technology of sponge iron for water purifying agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0056] Example 1: A production process of sponge iron water purifier, the active ingredients of sponge iron are C, Fe and some Fe 3 C, TFe content ≥ 92%, C content and impurity content ≤ 8%, metallization rate ≥ 95%, the main production steps are:

[0057] (1) The iron scales are dried and finely ground until the particle size is less than 100 mesh for later use;

[0058] (2) Mix iron scale, carbonaceous material (caramel), pore-forming aid (siderite) and binder according to the mass ratio of 75%: 12%: 10%: 3% and press the ball, The particle size of green pellets is 12-35mm, and the water content of green pellets is ≤8%;

[0059] (3) Use the combustion-supporting air preheated by the high-temperature flue gas in the coal-based shaft furnace combustion chamber to dry the green pellets in the drying facility, and the moisture content of the green pellets after drying is ≤3%;

[0060] (4) Mix the dried green pellets with anthracite and limestone, wherein the amount of anthraci...

Embodiment 2

[0064] Example 2: A production process of sponge iron water purifier, the active ingredients of sponge iron are C, Fe and some Fe 3 C, TFe content ≥ 85%, C and impurities ≤ 15%, metallization rate ≥ 95%, the main production steps are:

[0065] (1) Iron scale and TFe≥67 iron fine powder are respectively dried and finely ground until the particle size is less than -100 mesh for later use;

[0066] (2) Prepare spare iron scale, iron fine powder, carbonaceous material (graphite: caramel = 0.5:0.5), pore-forming aid (siderite) and binder according to 15%: 57%: 15%: 10 %: 3% mass ratio, mix and press the ball, the particle size of the green ball is 12-35mm, and the water content of the green ball is ≤8%;

[0067] (3) Use the combustion-supporting air preheated by the high-temperature flue gas in the coal-based shaft furnace combustion chamber to dry the green pellets in the drying facility, and the moisture content of the green pellets after drying is ≤3%;

[0068] (4) Mix the dri...

Embodiment 3

[0072] Example 3: A production process of sponge iron water purifier, the active ingredients of sponge iron are C, Fe and some Fe 3 C, TFe content ≥ 70%, C and impurity content ≤ 30%, metallization rate ≥ 95%, the main production steps are:

[0073] (1) TFe≥67% iron concentrate powder is dried and finely ground to a particle size of less than 100 mesh for subsequent use;

[0074] (2) Mix iron powder, anthracite, pore-forming aid (siderite:clay=0.8:0.2) and binder according to the mass ratio of 60%:25%:10%:5% and press the ball , the particle size of green pellets is 12-35mm, and the water content of green pellets is ≤8%;

[0075] (3) Use the combustion-supporting air preheated by the high-temperature flue gas in the coal-based shaft furnace combustion chamber to dry the green pellets in the drying facility, and the moisture content of the green pellets after drying is ≤3%;

[0076] (4) Mix the dried green pellets with anthracite and limestone, wherein the amount of anthracit...

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Abstract

The invention relates to a production technology of sponge iron for a water purifying agent. The production technology comprises steps as follows: (1), a dried and finely ground iron-containing raw material is mixed uniformly with a carbonaceous material, a pore-forming auxiliary and binder components, and a mixture is pressed into balls; (2), green balls are dried and mixed uniformly with a reducing agent and a desulfurizing agent, preheating, reducing and cooling are performed in a coal shaft furnace, and a sponge iron mixture is obtained; (3), after the sponge iron mixture is subjected to magnetic separating, sponge iron metallized pellets and residual coal are obtained; sponge iron particles obtained after crushing and screening of the sponge iron metallized pellets are used as the water purifying agent. The production technology has the remarkable advantages of being advanced, reliable, stable in product quality, low in production cost, high in production efficiency and environmentally friendly, and large-scale production can be realized; the produced sponge iron water purifying agent has the advantages of large specific surface area, high specific surface energy, higher electrochemical enrichment, physical absorption and flocculation precipitation and the like, and can be widely used for treating various kinds of wastewater with difficulty in biochemical degradation.

Description

technical field [0001] The invention relates to the technical field of water purifiers, in particular to a production process of sponge iron water purifiers, which are mainly used for the production of water purifiers that meet the requirements of different wastewater purification, deoxidation and H removal 2 Sponge iron water purifier required for S treatment. Background technique [0002] Iron is an active metal with strong reducibility, and the electrode potential E 0 (Fe 2+ / Fe)=-0.44V. Elemental iron can not only accelerate the conversion of nitrate, perchlorate and heavy metals, but also accelerate the degradation process of toxic pollutants such as chlorinated organics, azo dyes, and nitroaromatics. Therefore, as an efficient, cheap, simple and reliable method, zero-valent iron reduction and oxidation technology has been used in various fields of water treatment. [0003] As a new type of zero-valent iron material, sponge iron is the first choice for high-quality ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/461C02F1/52C02F1/70C02F1/72C02F3/34C02F101/10
CPCC02F1/281C02F1/461C02F1/5236C02F1/705C02F1/722C02F1/725C02F3/34C02F2101/10C02F2101/101
Inventor 汪朋李建涛周强唐恩陈泉锋
Owner WUHAN COSRED SCI & TECH LTD
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