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Method for treating molybdenum calcine acid pickling wastewater

A calcine acid and waste water technology, applied in water/sewage treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc. high-quality effects

Inactive Publication Date: 2019-03-29
JINDUICHENG MOLYBDENUM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These commonly used treatment methods all have a certain treatment capacity to reduce the molybdenum in the wastewater to a lower concentration, but it is difficult to meet the wastewater discharge standard

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The treatment method of the molybdenum calcination pickling waste water of the present embodiment comprises the following steps:

[0024] Step 1, the 1.5m 3 Molybdenum calcine pickling wastewater is added in the reactor, while stirring, add saturated sodium hydroxide solution to adjust the pH of molybdenum calcine pickling wastewater to be 7, then slowly add 1500mL of ammonium sulfide solution with a mass concentration of 8% and stir for 15min, statically After placing for 0.5h, mixed slurry A was obtained; the molybdenum content in the molybdenum calcine pickling wastewater was 7.25g / L, and the pH was 2;

[0025] Step 2, adopt vacuum suction filter to carry out vacuum filtration to the mixed slurry A obtained in step 1, obtain separating liquid, carry out molybdenum content detection to separating liquid and obtain the molybdenum content in separating liquid to be 0.393g / L, then adjust separating liquid After the pH is 4, add 10L saturated ferric chloride solution, st...

Embodiment 2

[0029] The treatment method of the molybdenum calcination pickling waste water of the present embodiment comprises the following steps:

[0030] Step 1, put 1m 3 Add the molybdenum calcine pickling wastewater into the reactor, add saturated sodium hydroxide solution while stirring to adjust the pH of the molybdenum calcine pickling wastewater to 7, then slowly add 1000mL of ammonium sulfide solution with a mass concentration of 8% and stir for 30min, statically After placing for 1h, mixed slurry A was obtained; the molybdenum content in the molybdenum calcine pickling wastewater was 10g / L, and the pH was 2;

[0031] Step 2, adopt vacuum suction filter to carry out vacuum filtration to the mixed slurry A obtained in step 1, obtain separating liquid, carry out molybdenum content detection to separating liquid and obtain the molybdenum content in separating liquid to be 0.27g / L, then adjust separating liquid After the pH was 5, 1.5L saturated ferric chloride solution was added, ...

Embodiment 3

[0035] The treatment method of the molybdenum calcination pickling waste water of the present embodiment comprises the following steps:

[0036] Step 1, the 0.8m 3 Add molybdenum calcine pickling wastewater to the reaction kettle, add sodium hydroxide while stirring to adjust the pH of molybdenum calcine pickling wastewater to 7, then slowly add 800mL of ammonium sulfide solution with a mass concentration of 8% and stir for 20min, let stand for 0.5 Obtain mixed slurry A after h; The molybdenum content in the molybdenum calcination pickling waste water is 9.8g / L, and pH is 2;

[0037] Step 2, adopt vacuum suction filter to carry out vacuum filtration to the mixed slurry A obtained in step 1, obtain separating liquid, carry out molybdenum content detection to separating liquid and obtain the molybdenum content in separating liquid to be 0.40g / L, then adjust separating liquid After the pH is 5, add 2.5L ferric nitrate solution and stir for 15 minutes to obtain mixed slurry B; th...

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PUM

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Abstract

A method for treating molybdenum calcine acid pickling wastewater is disclosed. The method includes 1) adding an ammonium sulfide solution to the molybdenum calcine acid pickling wastewater, stirringthe mixture, and allowing the mixture to stand to obtain mixed slurry A; 2) adding an iron trichloride solution or an iron nitrate solution into a liquid obtained by solid liquid separation of the mixed slurry A to obtain mixed slurry B; 3) adding polymeric ferric sulfate or a polyacrylamide polymeric flocculant solution into the mixed slurry B, and then allowing the mixture to stand to obtain mixed slurry C; and 4) adjusting the pH of a liquid obtained by subjecting the mixed slurry C to solid liquid separation to 7, and performing filtration to obtain treated molybdenum calcine acid picklingwastewater, with the filter residues being discarded. A water purification agent or a flocculant is introduced on the basis of a sulfuration precipitation method and an iron salt precipitation methodso that a compound formed by an iron salt and molybdenum forms large agglomerate groups and is removed through solid liquid separation, thus improving the molybdenum removing rate, and allowing the molybdenum content of the wastewater to decrease to 0.5 mg / L or below which meets emission requirements in the national standard in China.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular relates to a treatment method for molybdenum calcination pickling waste water. Background technique [0002] To improve pollution discharge standards and strictly control the total amount of pollutant discharge, the Ministry of Environmental Protection and the State Administration of Quality Supervision jointly issued GB31573-2015 "Inorganic Chemical Industrial Pollutant Discharge Standards" in 2015. The standard requires the discharge standard of molybdenum in wastewater is less than 0.5mg / L, [0003] The conventional ammonium molybdate production process pickles and removes impurities from the raw molybdenum calcine by means of salt pretreatment. In the pickling process, first put the acid precipitation mother liquor into the reaction kettle, then put in the raw material molybdenum calcined sand, and then add a certain amount of nitric acid to achieve the effect...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/20
CPCC02F1/001C02F1/5245C02F1/56C02F2101/20
Inventor 徐芳苓樊建军李峰杨艳王晓娟田建荣
Owner JINDUICHENG MOLYBDENUM CO LTD
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