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

A technology of iron oxide black and pyrite, which is applied in the fields of mining wastewater treatment, ferric oxide, chemical instruments and methods, etc., can solve the problems of inapplicability, long treatment period, and large initial investment, etc., and achieve resource utilization Effects of chemical treatment, clear social and environmental benefits

Active Publication Date: 2012-05-23
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 black pigment by carrying out resourceful treatment on pyrite wastewater
  • Method for preparing iron oxide black pigment by carrying out resourceful treatment on pyrite wastewater
  • Method for preparing iron oxide black pigment by carrying out resourceful treatment on pyrite wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 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 8. Stand still to obtain the precipitate ferrous hydroxide and the supernatant, and discard the supernatant that reaches the standard.

[0040] B. Pour the precipitated ferrous hydroxide into the reactor, gradually heat up to 80°C, stir to react, and at the same time, introduce a small amount of air to slowly oxidize. The air volume in this process is controlled at 0.01m 3 / h, the stirring speed is 100r / min, the color of the reaction solution changes from the original dark green to black green, and finally turns black, and the intermediate sampling is carried out continuously to check the color light. The method of sampling and inspecting the shade is as follows: extract a small amount of reaction liquid, filter it with suction, wash the filter cake with water, dry it, check the shade, and compare it wit...

Embodiment 2

[0044] The reaction conditions are the same as in Example 1, except that in step A, NaOH aqueous solution (30 wt %) is added to adjust the pH value to 10, and other operations and conditions are the same as in Example 1 to obtain 2.0304 g of iron oxide black pigment.

Embodiment 3

[0046] The reaction conditions are the same as in Example 1, except that in step B, the temperature is raised to 100° C., and other operations and conditions are the same as in Example 1 to obtain 2.0965 g of iron oxide black pigment.

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Abstract

The invention discloses a method for preparing an iron oxide black pigment by carrying out resourceful treatment on pyrite wastewater. The method comprises the following steps: (1) adding alkaline solution into pyrite wastewater, adjusting a pH value to between 8 and 10, standing the mixture to obtain sediments and a supernatant liquid, and removing the supernatant liquid; and (2) putting the sediments obtained in the step (1) into a reactor, pumping in the air, making the sediments and the air react with each other by heating and stirring, controlling a temperature of between 80 and 100 DEG C, a stirring rate of between 100 and 200r / min, an air adding amount of between 0.01 and 0.05m3 / h, tracking the reaction product in the reaction liquid and sampling to test chromatic light, when the chromatic light of the reaction product is consilient with that of a sample of iron oxide black pigment by comparing the reaction product with the sample of iron oxide black pigment, stopping the reaction, and processing the reaction liquid to obtain the iron oxide black pigment. The invention not only processes the acid pyrite wastewater to make the acid pyrite wastewater discharged after reachingstandards, but also utilizes useful components in the pyrite wastewater to prepare the iron oxide black pigment, realizes the resourceful treatment of the waste, can be widely applied to the treatment of mineral wastewater with higher iron content, and has obvious social and environmental benefits.

Description

(1) Technical field [0001] The invention relates to a method for resource-processing pyrite waste water to prepare iron oxide black 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. under suitable geochemical conditions, after tens of thousands of years. Formed by 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 scho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G49/08C09C1/24C02F9/04C02F1/66C02F1/52C02F1/74C02F103/10C02F101/20C02F101/10
Inventor 林春绵徐明仙李雁何卓
Owner ZHEJIANG UNIV OF TECH