Attapulgite clay reduction-magnetic separation coupling continuous iron removal, whitening and purification method

A technology of attapulgite clay and purification method, which is applied in chemical instruments and methods, reduced water/sewage treatment, water/sludge/sewage treatment, etc., and can solve the problems of organic solvents increasing production and environmental protection costs, unfavorable continuous treatment, etc. , to achieve a high degree of process automation and continuity, to facilitate industrial production, and to achieve the effect of simple process

Active Publication Date: 2020-03-27
BEIJING UNIV OF CHEM TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned documents all adopt the batch operation method, which is unfavorable for continuous processing
In addition, not only the introduction of organic solvents increases the cost of production and environmental protection, but also the impurity iron is not extracted, and there is still a hidden danger of re-pollution

Method used

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  • Attapulgite clay reduction-magnetic separation coupling continuous iron removal, whitening and purification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Taking Gansu brick red attapulgite clay as an example, pulverize the mineral powder with a grinder, add water to adjust the solid-to-liquid ratio of the slurry to 1:4, and use 8% phosphoric acid to adjust the pH value of the slurry to 0~ 1. Soak with mechanical stirring for 2 hours.

[0018] (2) Add the above-mentioned acidic attapulgite slurry into the enamel reaction kettle with a glass loop magnetic separator, slowly add aluminum powder into the above-mentioned slurry under mechanical stirring, the quality of the added aluminum powder is 10% of the mass of the attapulgite clay, continue Stir to form an attapulgite reduction slurry; keep the pH value of the slurry in the range of 0 to 1 during the reaction process by dropping phosphoric acid with a mass fraction of 8%; turn on the peristaltic pump to make the attapulgite reduction slurry continue to flow through the magnetic separator and then return to To the reactor, circulate until the attapulgite slurry turns ...

Embodiment 2

[0020] (1) Taking Gansu brick red attapulgite clay as an example, pulverize the ore powder with a sand mill, add water to adjust the solid-to-liquid ratio of the slurry to 1:2, and adjust the pH value of the slurry with 5% sulfuric acid 3-5, mechanical stirring and soaking for 1 hour.

[0021] (2) Add the above-mentioned acidic attapulgite slurry into the enamel reaction kettle with a magnetic separator, slowly add sodium borohydride into the above-mentioned slurry under mechanical stirring, the quality of adding sodium borohydride is 8% of the mass of the attapulgite clay, continue Stir to form an attapulgite reduction slurry; start the peristaltic pump to make the attapulgite reduction slurry continue to flow through the magnetic separator and then return to the reactor, and keep the pH value of the slurry in the reaction process by dropping sulfuric acid with a mass fraction of 5% in the range of 3 to 5 ; Continue to circulate until the attapulgite slurry turns white comple...

Embodiment 3

[0023] (1) Taking Gansu brick red attapulgite clay as an example, pulverize the ore powder with a basket grinder, add water to adjust the solid-to-liquid ratio of the slurry to 1:9, and adjust the pH value of the slurry with 10% hydrochloric acid 0-3, mechanical stirring and soaking for 0.5 hours.

[0024] (2) Add the above-mentioned acidic attapulgite slurry into an enamel reaction kettle with a magnetic separator, slowly add magnesium powder into the above-mentioned slurry under mechanical stirring, the quality of the added magnesium powder is 5% of the mass of the attapulgite clay, and continue stirring to form Attapulgite reduction slurry; start the peristaltic pump to make the attapulgite reduction slurry continue to flow through the magnetic separator and then return to the reactor, and keep the pH value of the slurry between 0 and 3 during the reaction process by dropping hydrochloric acid with a mass fraction of 10% ; Continue to circulate until the attapulgite slurry ...

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Abstract

The invention belongs to the technical field of chemical engineering and particularly relates to an attapulgite clay reduction-magnetic separation coupling continuous iron removal, whitening and purification method. According to the invention, a reduction reaction-magnetic separation coupling method is adopted, the particle size screening, grinding pulping and acid leaching impurity separation arecarried out on natural attapulgite clay; under the condition of controlling the pH value, Fe2+ and Fe 3+ in a solution are reduced and replaced by using a reducing agent, reduced iron elementary substance in an attapulgite clay slurry is continuously removed through magnetic separation, so that the purpose of removing impurities is achieved. Acidic water filtered after magnetic separation can berecycled as raw material water, so that the iron removal efficiency of the attapulgite clay is improved while the discharge of acidic wastewater is avoided. The method can effectively remove free iron, sulfur, phosphorus and other impurity minerals, the original crystal structure is not destroyed, and the method has the advantages of simple process, no waste acid discharge, high process automationand continuity degree and environment friendliness and is convenient for industrial production. The effective and high-value utilization of attapulgite clay resources can be promoted.

Description

technical field [0001] The invention relates to a technology for removing impurities from attapulgite clay, in particular to a purification method for iron removal and whitening of attapulgite clay. The method is simple and environmentally friendly. Background technique [0002] Attapulgite clay, also known as palygorskite, is a natural hydrous magnesium-rich aluminum silicate clay mineral with a rod-like microscopic appearance. It consists of tetrahedral-octahedral-tetrahedral (T-O-T) talc-like ribbons parallel to the fiber axis, and the ribbons are connected by reverse Si-O-Si bonds to form two continuous tetrahedral sheets. and an interrupted octahedral sheet. Due to the unique pore structure and surface properties, attapulgite clay has been widely used in many aspects such as adsorbents, catalysts, polymer functional additive materials and fluorescent materials. [0003] Natural attapulgite clay has a darker color (brick red, brown, grayish yellow, gray) due to the su...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/70C02F101/20
CPCC02F1/70C02F2101/203
Inventor 冯拥军王兴鹏何俊玲唐平贵陈馨魏邦延
Owner BEIJING UNIV OF CHEM TECH
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