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Kieselguhr/coal ash particle adsorbent and preparing method and application of kieselguhr/coal ash particle adsorbent

A particle adsorbent, fly ash technology, applied in chemical instruments and methods, adsorbed water/sewage treatment, other chemical processes, etc., can solve the problems of difficult solid-liquid separation, clogging of equipment, low cost, etc., to reduce the follow-up treatment. cost, solve the effect of stacking and occupying space, and low cost

Inactive Publication Date: 2015-12-02
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the problems and technical deficiencies such as the difficulty of subsequent solid-liquid separation and blockage of equipment caused by the existing powdery adsorbent that melts when it meets water, and provide a kind of adsorbent granulation that uses diatomite and fly ash. The production method uses diatomite, fly ash and starch to prepare granular adsorbents for the adsorption of heavy metal ions
The granular adsorbent is low in cost, can effectively solve problems such as solid-liquid separation and equipment blockage, and realize industrial continuous operation

Method used

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  • Kieselguhr/coal ash particle adsorbent and preparing method and application of kieselguhr/coal ash particle adsorbent
  • Kieselguhr/coal ash particle adsorbent and preparing method and application of kieselguhr/coal ash particle adsorbent
  • Kieselguhr/coal ash particle adsorbent and preparing method and application of kieselguhr/coal ash particle adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] Example 1 Preparation of diatomite / fly ash granular adsorbent

[0044] 1. Preparation method

[0045] S1. Sift diatomaceous earth and fly ash through 200 meshes, according to parts by weight. Diatomaceous earth: fly ash: starch: water = 3:2:1:2 and mix evenly, add water and stir to make a mud mass, and let stand Aging for 24h;

[0046] S2. Granulate the sludge obtained in S1 to form green balls with a particle size of 2 to 3 mm, and dry them naturally at room temperature for 24 hours;

[0047] S3. Dry the particles obtained from S2 at 105°C for 6 hours;

[0048] S4. Place the particles obtained in S3 in a muffle furnace, roast them at 500° C. for 1 hour, perform roasting and shaping, and then cool them naturally to obtain a diatomaceous earth / fly ash particle adsorbent.

[0049] 2. After measurement, the specific surface area of ​​the diatomite / fly ash particle adsorbent prepared above is 27.093m 2 / g, the water absorption rate is 31.90%.

Embodiment 2

[0050] Example 2 Simulation application test

[0051] 1. Weigh a certain amount of diatomaceous earth / fly ash particle adsorbent into a 250mL Erlenmeyer flask, add Cu 2+ 20mg / L, Zn 2+ 10mg / L or Ni 2+ 50mL of 10mg / L heavy metal ion solution, control the initial pH of the solution to 5.44~6.61, and vibrate and adsorb at room temperature for 3h.

[0052] 2. See Table 1 for the removal rate of adsorbed heavy metal ions.

[0053] Table 1 Removal rate of heavy metal ions by diatomite / fly ash particulate adsorbent

[0054]

Embodiment 3

[0055] Example 3 Wastewater treatment application

[0056] 1. Take the electroplating wastewater after physical and chemical precipitation for experiments. The pH of the wastewater is determined to be 9.23 and the total copper concentration is 2.104mg / L.

[0057] 2. Weigh 0.6g of diatomaceous earth / fly ash particulate adsorbent, place it in a 250mL Erlenmeyer flask, add 50mL of electroplating wastewater that has been adjusted to pH=7, and vibrate for 2.5-3h at room temperature.

[0058] 3. The total copper concentration in the wastewater after treatment is 0.28mg / L, and the removal rate reaches 86.69%.

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Abstract

The invention discloses a kieselguhr / coal ash particle adsorbent and a preparing method and application of the kieselguhr / coal ash particle adsorbent. Kieselguhr raw ore powder and coal ash are taken as the main raw materials of the particle absorber, starch is mixed to serve as a pore forming agent, a series of processes including mixing with added water, pelletizing, air drying, drying and roasting are conducted, and therefore the kieselguhr raw ore powder and coal ash powdery absorbent is formed and obtained in a compound mode. According to the particle absorbent, granulation of the powdery absorbent is achieved, certain mechanical strength and very good adsorbing performance are achieved, the problems that solid and liquid separation is difficult and equipment is blocked after the powdery absorbent is used for treating waste water can be effectively solved, dynamic operation is easily achieved, generation of industrial sludge is reduced, and subsequent treating cost is reduced. In addition, the preparing technology is simple, raw material sources are wide, cost is low, and high application value and practical significance are achieved in practical industrial production.

Description

technical field [0001] The invention belongs to the technical field of adsorbents, and more specifically relates to a diatomite / fly ash particle adsorbent and its preparation method and application. Background technique [0002] As a cheap non-metallic mineral, diatomite has good adsorption properties for heavy metals. However, at present, a large number of researches are still in the powder research stage, and the powdery diatomite minerals used in water treatment have problems such as difficult solid-liquid separation, easy to cause equipment blockage, and difficult to achieve dynamic operation. [0003] A large number of studies have shown that powdered adsorbents have good adsorption properties, but their swelling and settling properties in water are poor, and they have strong suspending and dispersing properties. High turbidity, poor permeability, difficult solid-liquid separation after treatment, increase subsequent treatment steps and costs, easily lead to equipment ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/14B01J20/30C02F1/28C02F1/62C02F101/20
Inventor 石太宏叶进鹏
Owner SUN YAT SEN UNIV
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