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A method for preparing schistose nanometer magnesium hydroxide and sphericity nanometer white carbon black using zillerite gangue

A technology of nano-magnesium hydroxide and nano-white carbon black, applied in the direction of magnesium hydroxide, silicon oxide, silicon dioxide, etc., can solve the problems of comprehensive utilization rate and low product grade, single extraction or utilization, etc., and achieve dispersibility and The effect of good surface activity, good product quality and easy handling

Inactive Publication Date: 2008-04-16
CHINA UNIV OF MINING & TECH (BEIJING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disclosed asbestos tailings utilization technology is only a single extraction or utilization of a certain component or simple utilization, such as extraction of magnesium oxide or use as ingredients for cement and refractory materials, its comprehensive utilization rate and product grade are relatively high Low

Method used

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  • A method for preparing schistose nanometer magnesium hydroxide and sphericity nanometer white carbon black using zillerite gangue
  • A method for preparing schistose nanometer magnesium hydroxide and sphericity nanometer white carbon black using zillerite gangue
  • A method for preparing schistose nanometer magnesium hydroxide and sphericity nanometer white carbon black using zillerite gangue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Get 100g of asbestos tailings powder, add 219g concentration of 37% hydrochloric acid, add water 75ml, react at 95°C for 1.5h; separate solid-liquid components after filtration; React at 80°C for 15 minutes, add sodium hydroxide solution to adjust the pH of the system to 6.5, and age for 30 minutes; after filtering and separating the precipitate, adjust the Baume degree of the solution to 20°, add 0.11 g of polyethylene glycol, Add dropwise sodium hydroxide solution for precipitation reaction for 5 minutes until the pH value of the system is 13. After aging for 50 minutes, filter, wash and dry to obtain the flaky nano-sized magnesium hydroxide product.

[0046] Add 11.66g of 26.4g of solid sodium hydroxide to the acid leaching residue, add 87ml of water, stir and react at 85°C for 1h, filter out the residue, add water to adjust the Baume degree of the filtrate to 20°, add 3g of anhydrous sodium sulfate and add 6.0% silane coupling agent SCA-1613, add sulfuric acid with ...

Embodiment 2

[0048] Put 150kg of asbestos tailings, 392kg of hydrochloric acid with a mass concentration of 31%, and 93kg of water into the reaction kettle, heat and control the temperature between 95°C and 110°C for 1.5h. Then, the solid and liquid components were separated by filtration. The Baume degree of the leaching solution was adjusted to 18°, the temperature was controlled at 65, and 5.18 kg of hydrogen peroxide with a mass concentration of 30% was used for oxidation treatment for 15 minutes. Start to add alkali after the completion of the reaction, the mass concentration of sodium hydroxide solution used is 20%, the time for adding alkali is 3 minutes, the amount of alkali used is 200L, and aging for 25 minutes after the reaction. After the reaction, the pH value of the filtrate is 5 to 6. The solid-liquid system after the reaction is separated by filtration, and the obtained precipitate is calcined at 700° C. to obtain a mixture whose main components are iron oxide, magnesium o...

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Abstract

The invention relates to a method of synthesis use of asbestos gangue, belonging to the mineral processing and environment protection field. The asbestos gangue powder and hydrochloric acid solution are conducted soaking reaction and separate solid and liquid component. The filtrate is added with oxidizer to oxidize Fe<2+> and added with alkali solution precipitate iron, aluminum and calcium filtrate components in the filter solution. Deposit is removed by filter and alkali is added for reaction. Right amount of particle separating dose is added at the same time. Magnesium hydroxide of nanometer grade and sheet shape grain shape is obtained. Reacted residue of asbestos gangue powder and hydrochloric acid and sodium hydroxide or sodium carbonate react in heating situation. The reacted product is filtered and the filter solution is added with little sodium sulfate and water to adjust thickness. Surface modifier or particle separating dose is added and acid is used to settle out. The settled out product is aged, filtered, washed and dried to get the round-shape nanometer grade white carbon soot. The impurity of the filter is removed by acid to get precipitation. The precipitation passes through drying and calcinations to get iron oxide, alumina and calcium oxide mixture (product of removing impurity).

Description

1. Technical field [0001] The invention relates to a method for comprehensive utilization of asbestos tailings, belonging to the fields of mineral processing and environmental protection. 2. Background technology [0002] At present, about 25 tons of asbestos tailings are produced for every ton of finished asbestos produced in asbestos production areas in western my country, and millions of tons of asbestos tailings are added every year. However, the existing asbestos tailings are seldom used, and a large number of asbestos tailings are abandoned, which poses a serious threat to the local ecological environment. Therefore, solving the comprehensive utilization of asbestos tailings piled up like mountains is one of the major challenges of environmental protection in asbestos-producing areas in western my country, and even in the entire western region. The disclosed asbestos tailings utilization technology is only a single extraction or utilization of a certain component or s...

Claims

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Application Information

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IPC IPC(8): C01F5/14C01B33/18
Inventor 郑水林杜高翔
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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