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Composite flocculating agent for treating oil sand deposit tailings, and treating method for cured fine tailings

A composite flocculant and a treatment method technology are applied in the treatment field of composite flocculants and matured fine tailings, and can solve the problems that the treatment effect needs to be improved, the suspended matter in the supernatant is high, and the water content of the sediment is high, and the capillary suction can be achieved. The effect of short time, clear supernatant and high sediment solid content

Active Publication Date: 2019-11-08
CHINA SPECIAL EQUIP INSPECTION & RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the existing flocculant is used for treatment, the settling rate is slow, and after flocculation, the supernatant has a lot of suspended matter, the turbidity is large, and the water content of the bottom sludge is high, so the treatment effect needs to be improved.

Method used

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  • Composite flocculating agent for treating oil sand deposit tailings, and treating method for cured fine tailings
  • Composite flocculating agent for treating oil sand deposit tailings, and treating method for cured fine tailings
  • Composite flocculating agent for treating oil sand deposit tailings, and treating method for cured fine tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] 50% polyacrylamide (viscosity-average molecular weight 10 million, ionicity 30%), 30% polydimethyldiallylammonium chloride (relative molecular weight 500,000), 10% calcium carbonate, 9.5% The modified diatomite is mixed with 0.5% activated carbon to prepare a composite flocculant.

[0062] The appearance of the flocculating agent is gray solid particles, the effective content is ≥88%, and the density (20°C) is 0.7-0.8g / cm 3 , The pH value of 0.5% aqueous solution is 7-8.

Embodiment 2

[0064] After fully shaking the tailings sample, weigh 1000g and place it in a 1L beaker. The sample was stirred with a stirrer at a speed of 350 rpm for 3 minutes, then the speed was reduced to 160 rpm, and 0.05% of the aqueous flocculant solution prepared in Example 1 was added.

[0065] Once the flocculant solution is added, start timing, and the time for adding the flocculant is 1 minute, and continue to stir for 1 minute after adding. Turn off the agitator and transfer the flocculated tailings sample into a 1 L graduated cylinder with graduated paper. Start timing quickly, and record the sedimentation curve of the sedimentation height versus time.

[0066] At the same time, do the sedimentation experiment of adding different dosages of the composite flocculant and polyacrylamide alone. For each settling curve, see figure 2 and image 3 , figure 2 It is the sedimentation curve of the composite flocculant of the present invention, and its dosage is respectively 100g / t...

Embodiment 3

[0072] 65% polyacrylamide (viscosity-average molecular weight 10 million, ionicity 30%), 5% polydimethyldiallyl ammonium chloride (relative molecular weight 500,000), 10% calcium carbonate, 19% The modified diatomite is mixed with 1% activated carbon to prepare a composite flocculant.

[0073] The appearance of the flocculating agent is gray solid particles, the effective content is ≥88%, and the density (20°C) is 0.7-0.8g / cm 3 , The pH value of 0.5% aqueous solution is 7-8.

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Abstract

The invention provides a composite flocculating agent for treating oil sand deposit tailings, and a treating method for cured fine tailings. The composite flocculating agent comprises 30-70% of polyacrylamide, 5-30% of poly(dimethyldiallyl ammonium chloride), 2-20% of a calcium-containing material and 1-20% of an adsorbent, wherein the calcium-containing material is one or more selected from the group consisting of calcium carbonate and calcium oxide, and the adsorbent is one or more selected from the group consisting of diatomite and activated carbon. The composite flocculating agent has a rapid sedimentation speed; after solid-liquid separation, liquid supernatant is clear, the content of suspended matters is low, and turbidity is small; flocs formed after flocculation are dense, and thesolid content of bottom mud is high; and the composite flocculating agent has good temperature adaptability. The composite flocculating agent has good solubility, and can be directly added as dry powder in virtue of an appropriate dosing device, thereby eliminating a flocculating agent dissolving device and reducing investment. The composite flocculating agent of the invention can be used for treating cured fine tailings; and the composite flocculating agent can also be used for secondary dewatering of bottom mud, and after the composite flocculating agent is added into the bottom mud, capillary suction time is short, yield stress is moderate, and a dehydration rate is high.

Description

technical field [0001] The invention belongs to the technical field of tailings treatment, and in particular relates to a composite flocculant for treating oil sand mine tailings and a treatment method for mature fine tailings. Background technique [0002] Oil sands are sedimentary sands rich in natural bitumen, also known as "tar sands". Essentially, oil sands are a natural mixture of bitumen, sand, bonanza clay and water. The composition and content of oil sands vary from place to place; in terms of mass fraction, a typical oil sand composition is: asphalt content is 3-20%, inorganic matter accounts for 80-85%, and the rest is 3-6% water. Synthetic crude oil can be obtained through mining and further extraction and separation of oil sands. Oil sand bituminous oil with high density, high viscosity, high carbon-hydrogen ratio and high metal content can be extracted from oil sand. In large-scale industrial production, hot alkaline water extraction is usually used to extra...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D21/01
CPCB01D21/01
Inventor 彭韵燕金栋蒋丽娜杨建华
Owner CHINA SPECIAL EQUIP INSPECTION & RES INST
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