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Treatment method of wastewater-neutralized gypsum tailing

A treatment method and technology of gypsum slag, applied in the direction of process efficiency improvement, photographic process, instrument, etc., can solve environmental pressure and other problems, and achieve the effect of avoiding economic value

Active Publication Date: 2014-09-24
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The process of producing vanadium pentoxide by calcification roasting method also uses lime milk neutralization method to treat the wastewater in the production process. The treated wastewater can be returned to the main process of vanadium oxide production for recycling, avoiding the discharge of vanadium oxide production wastewater and solving the problem of vanadium metallurgical production. process, and the cost of wastewater treatment is low, but this method also has unavoidable disadvantages. In the process of wastewater treatment, a large amount of neutralized gypsum slag will be produced. According to the annual output of 18,000 tons of vanadium pentoxide, the annual Hundreds of thousands of tons of gypsum slag are produced. If the gypsum slag is stacked and disposed of, it will cause great pressure on the environment and will not produce any economic benefits

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Take 100g of waste water exposed in the air for 1h to carry out sulfuric acid leaching reaction with gypsum slag, the waste water and gypsum slag contain 26.48% by weight of calcium oxide, 8.4% by weight of manganese, 0.1% by weight of vanadium, and 0.06% by weight of phosphorus , 0.29% by weight of iron, 1.49% by weight of magnesium oxide, 15.66% by weight of sulfur, 0.03% by weight of chromium, 1.74% by weight of silicon dioxide, 0.51% by weight of aluminum oxide and 0.76% by weight of titanium dioxide. Add 200g leaching agent sulfuric acid and 1g reducing leaching agent FeSO at normal temperature 4 , the leaching time is 0.5h, the leaching rate is 98%, the clear liquid and solid residue are obtained after solid-liquid separation, and the solid residue is washed with water for 6 times to obtain gypsum for construction. Use ammonia water to adjust the pH value of the clear liquid to 5, add 1 g of calcium oxide, stir for 0.5 h, add 1 g of activated carbon after solid-li...

Embodiment 2

[0037]Take 100g of waste water exposed to the air for 3 hours and carry out sulfuric acid leaching reaction with gypsum slag, which contains 26.48% by weight of calcium oxide, 8.4% by weight of manganese, 0.1% by weight of vanadium, and 0.06% by weight of phosphorus in the waste water and gypsum slag , 0.29% by weight of iron, 1.49% by weight of magnesium oxide, 15.66% by weight of sulfur, 0.03% by weight of chromium, 1.74% by weight of silicon dioxide, 0.51% by weight of aluminum oxide and 0.76% by weight of titanium dioxide. Add 200g leaching agent sulfuric acid and 1g reducing leaching agent FeSO at normal temperature 4 , the leaching time is 0.5h, the leaching rate is 98%, the clear liquid and solid residue are obtained after solid-liquid separation, and the solid residue is washed with water for 6 times to obtain gypsum for construction. Use ammonia water to adjust the pH value of the clear liquid to 5, add 1 g of calcium oxide, stir for 0.5 h, add 1 g of activated carbon...

Embodiment 3

[0039] Take 100g of waste water exposed in the air for 6h to carry out sulfuric acid leaching reaction with gypsum slag, which contains 26.48% by weight of calcium oxide, 8.4% by weight of manganese, 0.1% by weight of vanadium, and 0.06% by weight of phosphorus in the waste water and gypsum slag , 0.29% by weight of iron, 1.49% by weight of magnesium oxide, 15.66% by weight of sulfur, 0.03% by weight of chromium, 1.74% by weight of silicon dioxide, 0.51% by weight of aluminum oxide and 0.76% by weight of titanium dioxide. Add 200g leaching agent sulfuric acid and 1g reducing leaching agent FeSO at normal temperature 4 , the leaching time is 0.5h, the leaching rate is 98%, the clear liquid and solid residue are obtained after solid-liquid separation, and the solid residue is washed with water for 6 times to obtain gypsum for construction. Use ammonia water to adjust the pH value of the clear liquid to 5, add 1 g of calcium oxide, stir for 0.5 h, add 1 g of activated carbon afte...

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Abstract

The invention relates to a treatment method of wastewater-neutralized gypsum tailing, the wastewater-neutralized gypsum tailing comprises calcium oxide and manganese which is in a form of Mn (OH)2, and the method comprises the following steps: (1) a leaching process, to be more specific, mixing gypsum tailing in the wastewater and a leaching agent, contacting the obtained mixture with a reducing agent for reaction, performing solid-liquid separation on the mixture obtained by the reaction to obtain a clear liquid and solid residues; (2) an impurity removing process, to be more specific, removing impurities in the clear liquid for removing vanadium and phosphorus in the clear liquid to obtain a impurity-removed liquid; and (3) an electrolytic process, to be more specific, performing continuous electrolysis on the impurity-removed liquid. The wastewater-neutralized gypsum tailing treated by the method can be effectively recycled, building gypsum and metal manganese products in line with national YB / T0512003DJMnD standards can be recycled, a certain economic value can be produced, and environment pressure caused by stacking treatment of the wastewater-neutralized gypsum tailing can be avoided.

Description

technical field [0001] The invention relates to a treatment method for neutralizing gypsum slag in waste water. Background technique [0002] At present, lime milk neutralization method is widely used in metallurgical production enterprises to treat metallurgical production process wastewater. This method has the advantages of low treatment cost, simple wastewater treatment process, and recycled wastewater after treatment. The process of producing vanadium pentoxide by calcification roasting method also uses lime milk neutralization method to treat the wastewater in the production process. The treated wastewater can be returned to the main process of vanadium oxide production for recycling, avoiding the discharge of vanadium oxide production wastewater and solving the problem of vanadium metallurgical production. process, and the cost of wastewater treatment is low, but this method also has unavoidable disadvantages. In the process of wastewater treatment, a large amount of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C25C1/10C01F11/46
CPCY02P10/20
Inventor 孟伟巍彭毅陶长元刘作华钟国梅何文艺申彪卢晓林叶露吴封
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP