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Method for preparing iron oxide yellow pigment by carrying out resourceful treatment on pyrite wastewater

A technology for iron oxide yellow and pyrite, applied in iron oxide, mining wastewater treatment, chemical instruments and methods, etc., can solve the problems of long treatment period, inapplicability, and large initial investment, and achieve obvious social and environmental benefits, Realize the effect of resource processing

Inactive Publication Date: 2010-06-23
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the initial investment is large, the treatment period is long, and it is not suitable for large-flow underground mine water

Method used

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  • Method for preparing iron oxide yellow pigment by carrying out resourceful treatment on pyrite wastewater
  • Method for preparing iron oxide yellow pigment by carrying out resourceful treatment on pyrite wastewater
  • Method for preparing iron oxide yellow pigment by carrying out resourceful treatment on pyrite wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] A. Add NaOH aqueous solution (10wt%) to 500ml of pyrite wastewater (Niujiaowan closed mine wastewater under Zhejiang Juhua Chemical Co., Ltd.) to adjust the pH value to 5. Stand still to obtain the precipitate ferrous hydroxide and the supernatant, discard the supernatant.

[0047] B. In the reactor, add the precipitated ferrous hydroxide, pass through 1m 3 / h of air and heating for oxidation reaction, the temperature is controlled at 20°C, and the stirring speed is 100r / min. After 4 hours of reaction, the pH value of the reaction system is 3.5, and the reaction is stopped. Prepare 300ml of pure yellow iron oxide topaz seeds.

[0048] C, iron oxide topaz seed is dropped into oxidation tank, then add the pyrite waste water of 600ml (detection wherein the content of ferrous sulfate is 6wt%, the density of pyrite waste water is 1g / ml, what use below is the same batch of sulfur Iron ore wastewater, the content of ferrous sulfate is the same) and 20g iron powder, pass into...

Embodiment 2

[0052] Other operations and conditions are the same as in Example 1, except that NaOH aqueous solution (30wt%) is added in step A to adjust the pH value to 7.5. Other operations and conditions are the same as in Example 1 to obtain 4.0232g of iron oxide yellow pigment.

Embodiment 3

[0054] Other operation and condition are the same as embodiment 1, and difference is, the amount of air that feeds in the step B is 3m 3 / h, other operations and conditions were the same as in Example 1 to obtain 4.0369g of iron oxide yellow pigment.

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Abstract

The invention discloses a method for preparing an iron oxide yellow pigment by carrying out resourceful treatment on pyrite wastewater. The method comprises the following steps: using the pyrite wastewater as the crystal seed raw material; adding alkaline solution into the pyrite wastewater and adjusting a pH value to between 5 to 7.5; standing the mixture and putting the sediments into a reactor; pumping air into the reactor; making the sediments and the air react with each other by heating and stirring to prepare iron oxide yellow crystal seed; adding the iron oxide yellow crystal seed, the raw material pyrite wastewater the volume of which is 1.5 to 2.5 times of that of the iron oxide yellow crystal seed, and iron powders excessive relatively to ferrous sulphate in the raw material pyrite wastewater, pumping the air into the mixture, making the mixture and the air react with each other by heating and stirring, controlling a temperature of between 70 and 85 DEG C and an air adding amount of between 3 and 5m3 / h; tracking the reaction product in the reaction liquid and sampling to test chromatic light; and when the chromatic light of the reaction product is consilient with that of a sample of iron oxide yellow pigment by comparing the reaction product with the sample of iron oxide yellow pigment, stopping the reaction, and processing the reaction liquid to obtain the iron oxide yellow pigment. The invention not only processes the acid pyrite wastewater to make the acid pyrite wastewater discharged after reaching standards, but also utilizes useful components in the pyrite wastewater to prepare the iron oxide yellow pigment, and realizes the resourceful treatment of the waste.

Description

(1) Technical field [0001] The invention relates to a method for resource-processing pyrite waste water to prepare iron oxide yellow pigment. (2) Background technology [0002] Pyrite is an abundant mineral resource in the world. It is mainly composed of sulfur in the mantle, iron in the crust and other impurity elements such as Al, Mn, Cu, etc., after tens of thousands of years under suitable geochemical conditions. Formed by the mineralization evolution (hydrothermal, sedimentary, biological, metamorphic, composite, etc.), so the main component of pyrite is FeS 2 (pyrite, marcasite), FeS (pyrhotite), and also contains Al, Zn, Cu, Pb and other metal elements. During the mining process or after the pit is abandoned, due to the presence of oxygen and microorganisms in the pit, surface precipitation and groundwater will produce a large amount of Fe-containing minerals in the pit. 2+ and SO 4 2- of acidic wastewater. [0003] After decades of discussions and conclusions by...

Claims

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Application Information

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IPC IPC(8): C01G49/06C02F9/04C02F1/66C02F1/74C02F101/20C02F101/10C02F103/10
Inventor 林春绵徐明仙李雁何卓
Owner ZHEJIANG UNIV OF TECH
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