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Synthetic diamond purification wastewater treatment method

A synthetic diamond and wastewater treatment technology, which is applied in natural water treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of high recycling cost, large input of manpower and material resources, and large transportation volume , to achieve the effect of small quantity, saving recycling cost and manpower, material and financial resources

Inactive Publication Date: 2010-11-24
ZHONGNAN DIAMOND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] ①. Treated water: PH=8.0~9.0, Fe content: 5~10mg / L, Ni2+: content about 1mg / L, although it basically meets the discharge standard, but due to the influence of local impurity ions, sometimes the treated Water is used to detect heavy metal ions exceeding the standard
[0006] ②. The main components of filter mud are: calcium sulfate, iron hydroxide and nickel hydroxide. The effective components of the recyclable precious metal nickel are less than 5%, and the content is low, resulting in large transportation volume, high recycling costs, and human and material resources. Large amount

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] a. Collect the waste water from various places in the process of diamond purification into the raw liquid pool with pipes, and collect 80-100 tons.

[0025] b. Pump the wastewater stock solution into the aeration tank for aeration and oxidation, the aeration time is 15-24 hours, and the Fe in the stock solution 2+ Oxidized to Fe 3+ ;

[0026] c, pump the waste water after the b step treatment into a regulating tank, add a mass ratio of lime powder and liquid sodium hydroxide in an appropriate amount of 1:2, and start stirring, adjust the pH of the solution to 3.5, so that Fe 3+ Precipitation; after the pH value of the solution is stable for 10 to 20 minutes, pump it into a filter press for pressure filtration, and the filtrate flows into the storage tank; the main component of the filter mud is CaSO 4 and Fe(OH) 3 , and the filtered mud is transported to a special landfill after being discharged from the board;

[0027] d. Pump the filtrate that flows into the stora...

Embodiment 2

[0030] The steps are basically the same as in Example 1, the difference being: PH=4.0 during the first pressure filtration conditioning, and PH=8.0 during the second pressure filtration conditioning, the test results of the second pressure effluent: PH=8.0, Ni was not detected, Fe: 0.0014g / L, meeting discharge conditions. Second-press filter mud: Ni: 37.63%, Fe: 2.39%.

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PUM

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Abstract

The invention discloses a synthetic diamond purification wastewater treatment method which comprises the following steps: collecting wastewater into a stock solution tank by using ducts, and pumping the wastewater stock solution into an aeration tank to be aerated and oxidized for 15-24 hours, thereby oxidizing Fe<2+> in the stock solution into Fe<3+>; adding lime powder and liquid sodium hydroxide in the mass ratio of 1:2, stirring, and regulating the pH value of the solution to 3.5-4.0 so as to precipitate Fe<3+>; and pumping the filtrate into a secondary conditioning tank, adding 150-200 g / L sodium sulfide solution, stirring, regulating the pH value to 7.0-8.0 and precipitating all nickel ions and remnant ferrous ions. The pH value of the treated water is 7.0-8.0, the content of Fe is 0-3 mg / L, the concentration of nickel ions is less than 1 mg / L, and thus, the treated water completely reaches the emission standard; and the amount of secondary filter pressing mud is small, thereby saving the recycling cost and the investment into human, material and financial resources.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater treatment, in particular to a method for treating wastewater after purification of synthetic diamonds. Background technique [0002] The waste water after the purification of diamond synthesized by powder catalyst method is mainly: waste acid solution (PH=0.5~2.5), metal iron ion (Fe 3+ , Fe 2+ : content 1000~1500mg / L) and nickel ion (Ni 2+ : content 500~700mg / L) must be treated before discharge. [0003] In the traditional technology, the commonly used wastewater treatment method is: concentrate the wastewater stock solution into the comprehensive adjustment tank, add quicklime and sodium hydroxide, stir at the same time, adjust the pH = 8.0 to 9.0, and then pump it into the filter press , and the filtrate was discharged after precipitation. The filter mud contains calcium sulfate, iron hydroxide, nickel hydroxide, etc. Then it is sent to a qualified treatment plant to refine n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/34
Inventor 刘善跃刘杰孔祥来李璞严国军
Owner ZHONGNAN DIAMOND CO LTD