Polysilicic acid aluminum sulfate flocculating agent, preparation method and application

A technology of polysilicate aluminum sulfate and flocculant, which is applied in chemical instruments and methods, flocculation/sedimentation water/sewage treatment, water treatment parameter control, etc., can solve the problem that cannot meet the requirements of rapid on-site treatment of waste drilling fluid, polymer silicon The synthesis process of acid aluminum iron sulfate is complex, the treatment effect of drilling waste fluid is not good, etc., to achieve the effect of good flocculation and sedimentation, tight molecular structure, and fast preparation

Inactive Publication Date: 2018-12-28
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the prior art, the synthesis process of polyaluminium-ferric silicate sulfate is complicated, the operation is cumbersome, and the synthesis time is long, which cannot meet the requirements of rapid on-site treatment of waste drilling fluid, and the existing PAFSS flocculant for coking wastewater has a treatment effect on drilling waste fluid Therefore, it is necessary to develop a new PAFSS flocculant specially used for the treatment of oil and gas field drilling waste fluid

Method used

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  • Polysilicic acid aluminum sulfate flocculating agent, preparation method and application
  • Polysilicic acid aluminum sulfate flocculating agent, preparation method and application
  • Polysilicic acid aluminum sulfate flocculating agent, preparation method and application

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Embodiment 1

[0031] The preparation steps of polysilicate aluminum ferric sulfate flocculant in the present embodiment are as follows:

[0032] 1) Dissolve crystalline sodium silicate in water to obtain a solution with a concentration of 0.2mol / L, quickly adjust the pH value of the solution to 6 with a volume fraction of 20% sulfuric acid, then slowly adjust to 5, and polymerize at room temperature at a stirring speed of 80r / min 10min, obtain polysilicic acid (PAS);

[0033] 2) Add crystalline aluminum sulfate and crystalline ferrous sulfate in the solution of step 1) according to the molar ratio, so that the ratio of the sum of the molar masses of Al and Fe to the molar mass of Si is 0.5, the molar mass of Al and the molar mass of Fe The ratio is 0.5, polymerized at room temperature at a stirring speed of 80r / min for 10min, and then left to mature for 28h to obtain polyaluminum ferric silicate sulfate (PAFSS).

[0034] The application of polysilicate aluminum iron sulfate flocculant in t...

Embodiment 2

[0036] The preparation steps of polysilicate aluminum ferric sulfate flocculant in the present embodiment are as follows:

[0037] 1) Dissolve crystalline sodium silicate in water to obtain a solution with a concentration of 0.35mol / L, quickly adjust the pH value of the solution to 6 with a volume fraction of 20% sulfuric acid, then slowly adjust it to 3.5, and polymerize at room temperature at a stirring speed of 180r / min 20min, obtain polysilicic acid (PAS);

[0038] 2) Add crystalline aluminum sulfate and crystalline ferrous sulfate in the solution of step 1) according to the molar ratio, so that the ratio of the sum of the molar masses of Al and Fe to the molar mass of Si is 1.25, the molar mass of Al and the molar mass of Fe The ratio is 1.25, polymerized at room temperature at a stirring speed of 180r / min for 20min, and then left to mature for 24h to obtain polyaluminum ferric silicate sulfate (PAFSS).

[0039] figure 1 It is the microscopic morphological characterizat...

Embodiment 3

[0042] The preparation steps of polysilicate aluminum ferric sulfate flocculant in the present embodiment are as follows:

[0043] 1) Dissolve crystalline sodium silicate in water to obtain a solution with a concentration of 0.5mol / L, quickly adjust the pH value of the solution to 6 with a volume fraction of 20% sulfuric acid, then slowly adjust it to 2.1, and polymerize at room temperature at a stirring speed of 300r / min 30min, obtain polysilicic acid (PAS);

[0044] 2) Add crystalline aluminum sulfate and crystalline ferrous sulfate in the solution of step 1) according to the molar ratio, so that the ratio of the sum of the molar masses of Al and Fe to the molar mass of Si is 2.2, the molar mass of Al and the molar mass of Fe The ratio is 2.2, polymerized at room temperature at a stirring speed of 300r / min for 30min, and then left to mature for 20h to obtain polyaluminum ferric silicate sulfate (PAFSS).

[0045] The application of polysilicate aluminum iron sulfate floccula...

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Abstract

The invention discloses a polysilicic acid aluminum sulfate flocculating agent, a preparation method and application, and belongs to the technical field of purification of waste water in an oil and gas field. The preparation method for the polysilicic acid aluminum sulfate flocculating agent comprises the steps that 1) sodium silicate is dissolved in water to obtain a solution with the concentration of 0.2-0.5 mol/L, the p H value of the solution is 2.1-5, and the solution is stirred for polymerization for 10-30 minutes at the indoor temperature to obtain polysilicic acid; 2) according to molar ratio, aluminum sulfate and ferrous sulfate are added, (Al+Fe)/Sl=0.5-2.2, Al/Fe=0.5-2.2, the mixture is stirred for polymerization for 10-30 minutes at the indoor temperature and subjected to standing for curing for 20-28 hours, and the polysilicic acid aluminum sulfate flocculating agent is obtained. The flocculating agent is specially applied to waste liquid treatment for drilling wells in the oil and gas field, the flocculent precipitate effect is good, single dosage is added, the addition amount is small, the COD removing rate is high, and after treatment, the COD index of waste water is below the national emission standard.

Description

technical field [0001] The invention relates to a polysilicate aluminum iron sulfate flocculant, and also relates to a preparation method and application of the flocculant, belonging to the technical field of oil and gas field wastewater purification. Background technique [0002] Waste drilling fluid is one of the main sources of pollution in the oil and gas industry. With the rapid development of the petroleum industry, the types of drilling fluids are increasing, and the types of additives used in drilling fluids are also increasing, and the composition is extremely complex. The COD index is as high as several thousand milligrams per liter, and it is quite difficult to meet the discharge standards. As the amount of drilling fluid continues to increase, the amount of waste drilling fluid is also increasing. If waste drilling fluid and drilling wastewater are not treated or treated properly, they will cause serious pollution to the natural environment. According to statis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F103/10
CPCC02F1/5245C02F2209/08C02F2103/10
Inventor 韩洁郭建菲赵林邱建君张忠智孙中伟陈新安张婷
Owner CHINA PETROLEUM & CHEM CORP
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