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Method for producing artificial wollastonite powder by utilizing Bayer red mud

A Bayer red mud and wollastonite technology, applied in the direction of non-metallic elements, can solve environmental pollution and other problems, achieve stable physical and chemical properties, good effect, and increase the effect of heating time

Inactive Publication Date: 2013-02-13
四川海吉尔环保科技发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for producing artificial wollastonite powder with Bayer red mud, recycle the Bayer red mud produced in the alumina production process, further solve the environmental pollution problem caused by Bayer red mud, and also provide A widely used wollastonite powder

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  • Method for producing artificial wollastonite powder by utilizing Bayer red mud

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The Bayer red mud used in this embodiment contains 1% by weight of sodium hydroxide and 26% by weight of iron;

[0040] 1. Ingredients, take Bayer red mud, add stearic acid of 0.1% by weight of Bayer red mud, and the ingredients are completed;

[0041] 2. Grinding, grinding the ingredients into a 120-200 mesh slurry with a wet ball mill;

[0042] 3. For iron removal, use a wet magnetic separator with a magnetic strength of 6500 Gaust to perform three times of strong magnetic re-selection to remove iron from the red mud slurry; the iron content in the slurry after iron removal is: 8.97%;

[0043] 4. Granulating, add the slurry after iron removal to Bayer red mud with 1% wood sawdust and 10% carbon powder, stir evenly, and then send it to the granulator to make granules to be fired with a particle size of 2~5cm;

[0044] 5. Magnetization roasting. The pellets to be fired that are naturally dried are put into a rotary kiln and magnetized and roasted for 3 hours at a temp...

Embodiment 2

[0052] The Bayer red mud used in this embodiment contains 2.8% by weight of sodium hydroxide and 32% by weight of iron;

[0053] 1. Ingredients, add dilute hydrochloric acid with an acid-base molar equivalent concentration of 10% to the Bayer red mud to neutralize the sodium hydroxide in the Bayer red mud, and then add 0.3% benzenesulfonic acid by weight of the Bayer red mud. Finish;

[0054] 2. Grinding, grinding the ingredients into a 120-200 mesh slurry with a wet ball mill;

[0055] 3. For iron removal, use a wet magnetic separator with a magnetic strength of 8000 Gaust to perform three times of strong magnetic re-selection to remove iron from the red mud slurry; the iron content in the slurry after iron removal is: 11.2%;

[0056] 4. Granulating, add the slurry after iron removal to 3% of the weight of Bayer red mud plant fiber and 10% of carbon powder, stir evenly, and then send it to the granulator to make granules to be fired with a particle size of 2~5cm;

[0057]5....

Embodiment 3

[0065] The Bayer red mud used in this embodiment contains 4.7% by weight of sodium hydroxide and 29% by weight of iron;

[0066] 1. Ingredients, add dilute hydrochloric acid with an acid-base molar equivalent concentration of 10% to the Bayer red mud to neutralize the sodium hydroxide in the Bayer red mud, and then add stearic acid with a weight of 0.3% of the Bayer red mud. Finish;

[0067] 2. Grinding, grinding the ingredients into a 120-200 mesh slurry with a wet ball mill;

[0068] 3. For iron removal, use a wet magnetic separator with a magnetic strength of 7000 Gaust to perform three times of strong magnetic re-selection to remove iron from the red mud slurry; the iron content in the slurry after iron removal is: 8.7%;

[0069] 4. Pelletizing, adding 3% wood sawdust and 10% carbon powder to the Bayer red mud slurry after iron removal, stirring evenly, and then sending it to the granulator to make pellets to be fired with a particle size of 2-5cm;

[0070] 5. Magnetizat...

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Abstract

The invention belongs to the technical field of comprehensive utilization of red mud, and in particular relates to a method for producing artificial wollastonite powder by using Bayer red mud. The method mainly comprises the following steps of: grinding and deironing Bayer red mud, diluted hydrochloric acid with the concentration of 0-10 percent and a surfactant in 0.1-0.5 percent by weight of the Bayer red mud, then adding a leavening agent in 0-5 percent by weight of the Bayer red mud and carbon powder in 10 percent by weight of Bayer red mud and pelletizing, carrying out magnetized roasting, and grinding and deironing again to obtain the artificial wollastonite powder, wherein the powder fineness of the artificial wollastonite powder is more than 300 meshes and the content of impurities of iron and manganese in the powder is lower than 0.1 percent. The method disclosed by the invention not only realizes zero emission of the Bayer red mud but also has the capability of producing the artificial wollastonite powder with excellent performance.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of red mud, and in particular relates to a method for producing artificial wollastonite powder with Bayer red mud. Background technique [0002] Red mud is the solid waste discharged during the alumina production process. It is one of the main industrial wastes with large discharge volume, serious harm to the natural environment and difficult to use. It is named because its appearance color is similar to red soil. At present, most of the red mud can only be stored by damming and intercepting. A large amount of red mud not only occupies land, wastes resources, but also brings environmental pollution and safety hazards. At present, the world discharges about 60 million tons of red mud every year. In 2006, the output of alumina in my country was about 9.5 million tons, and the discharge of red mud was about 10 million tons. In addition to the cumulative accumulation over the years,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/20
Inventor 邹健彪
Owner 四川海吉尔环保科技发展有限公司
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