Preparation method for amorphous FeOOH water-purifying agent

An iron oxyhydroxide, water purifying agent technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problem of ineffective removal of arsenic, high aluminum ion content, secondary water Pollution and other problems, to achieve low production costs, improve economic benefits, and achieve the effect of recycling

Inactive Publication Date: 2016-07-27
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is that the composite polyferric water purifier in the prior art cannot effectively remove arsenic in drinking water, the arsenic removal rate is low, and the aluminum ion content is high, which easily leads to secondary pollution of the water body. Therefore, a preparation method of amorphous iron oxyhydroxide water purifier with high arsenic removal efficiency and no secondary pollution is proposed

Method used

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  • Preparation method for amorphous FeOOH water-purifying agent
  • Preparation method for amorphous FeOOH water-purifying agent
  • Preparation method for amorphous FeOOH water-purifying agent

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Embodiment 1

[0032] The present embodiment provides a kind of preparation method of amorphous iron oxyhydroxide water purifying agent, it comprises the following steps:

[0033] (1) take titanium dioxide factory by-product and dissolve it in water, prepare the ferrous sulfate solution that molar concentration is 1.7mol / L;

[0034] (2) in the ferrous sulfate solution described in step (1), adding concentration is the sulfuric acid of 27wt%, and the mol ratio of controlling described sulfuric acid and ferrous sulfate is 0.5:1, obtains the ferrous sulfate solution of acidification, is the next step Oxidation provides an acidic environment;

[0035] (3) under stirring condition, adopting plunger pump to add the hydrogen peroxide that concentration is 30wt% in the acidified ferrous sulfate solution described in step (2), the pump mouth of described plunger pump stretches below the liquid level and controls all The mol ratio of hydrogen peroxide and ferrous sulfate is 0.75:1, and the control ad...

Embodiment 2

[0045] The present embodiment provides a kind of preparation method of amorphous iron oxyhydroxide water purifying agent, it comprises the following steps:

[0046] (1) take technical grade ferrous sulfate heptahydrate and dissolve it in water, and prepare the ferrous sulfate solution that molar concentration is 1.5mol / L;

[0047] (2) in the ferrous sulfate solution described in step (1), adding concentration is the sulfuric acid of 27wt%, and the mol ratio of controlling described sulfuric acid and ferrous sulfate is 0.6:1, obtains the ferrous sulfate solution of acidification, is the next step Oxidation provides an acidic environment;

[0048] (3) under stirring condition, adopt plunger pump to add the hydrogen peroxide that concentration is 35wt% in the acidified ferrous sulfate solution described in step (2), the pump mouth of described plunger pump stretches below the liquid level and controls all The molar ratio of hydrogen peroxide and ferrous sulfate is 0.85:1, and th...

Embodiment 3

[0053] The present embodiment provides a kind of preparation method of amorphous iron oxyhydroxide water purifying agent, it comprises the following steps:

[0054] (1) take industrial grade ferrous sulfate heptahydrate and dissolve it in water, and prepare the ferrous sulfate solution that molar concentration is 1.2mol / L;

[0055] (2) in the ferrous sulfate solution described in step (1), adding concentration is the sulfuric acid of 27wt%, and the mol ratio of controlling described sulfuric acid and ferrous sulfate is 0.5:1, obtains the ferrous sulfate solution of acidification, is the next step Oxidation provides an acidic environment;

[0056] (3) under stirring condition, adopting plunger pump to add the hydrogen peroxide that concentration is 40wt% in the acidified ferrous sulfate solution described in step (2), the pump mouth of described plunger pump stretches below the liquid level and controls all The mol ratio of hydrogen peroxide and ferrous sulfate is 1:1, and the...

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Abstract

The invention provides a preparation method for an amorphous FeOOH water-purifying agent. The preparation method comprises the following steps: preparing a ferrous sulfate solution from industrial ferrous sulfate heptahydrate; adding a proper amount of sulfuric acid into the ferrous sulfate solution so as to provide an acidic environment; adding hydrogen peroxide into the solution and allowing ferrous sulfate to be oxidized into ferric sulfate under the condition of hydrolysis promotion by sulfuric acid; subjecting an industrial alkali source and the ferric sulfate solution to a precipitation reaction so as to produce iron hydroxide colloid; and dehydrating the iron hydroxide colloid under proper conditions so as to prepare the amorphous FeOOH water-purifying agent. The amorphous FeOOH water-purifying agent can effectively arsenic in water, has arsenic removal efficiency of 98% or above, does not contain aluminum ions or pose secondary pollution to a water body; after arsenic removal with the water-purifying agent, scorodite stably existing in the nature is produced, so pollution is not posed to the environment; moreover, raw materials used in the invention are of an industrial grade, and the preparation method is low in production cost and simple to operate.

Description

technical field [0001] The invention relates to a preparation method of an amorphous iron oxyhydroxide water purifier, and belongs to the technical field of arsenic removal for water purifiers. Background technique [0002] With the development of metallurgy, chemical industry and other industries and the development of lean mines, arsenic is developed along with the main elements, and the amount of arsenic entering the wastewater is quite large. Arsenic-containing wastewater mainly comes from the drainage of industries such as metallurgy, acid making, petroleum, pesticides and mining. According to statistics, there are 18 countries along the Mediterranean Sea, and about 80-90% of the sewage containing arsenic and other harmful substances is discharged into the Mediterranean Sea without treatment. According to the China Environmental Status Bulletin, in 1996, the discharge of industrial wastewater was 20.59 billion tons, and the discharged industrial wastewater contained 11...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/58
Inventor 王鲁璐王立贤
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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