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Method for extracting magnesium oxide and preparing active porous silicon dioxide material by using serpentine

A technology of porous silicon dioxide and silicon dioxide, applied in the direction of silicon dioxide, silicon oxide, magnesium sulfate, etc., can solve the problems of low operation and calcination temperature, small reaction temperature range, high particle size requirements of raw materials, etc., and achieve leaching time The effect of shortening, short roasting time and uniform distribution

Active Publication Date: 2014-09-10
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ammonium salt roasting method has more advantages than the acid leaching method; however, the ammonium salt roasting process requires high roasting temperature, small reaction temperature range, weak acidity, long roasting time, large energy consumption, and high particle size requirements for raw materials
[0007] So far, no active porous silica material has been prepared by extracting magnesia from serpentine and acid salt. Public reports of low-cost related technologies

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0033] This example chooses serpentine as raw material.

[0034] 1) Crushing, grinding, and magnetically separating the serpentine raw materials to process them into serpentine powder. The particle size is 60 mesh, and the mass percentage of MgO is 45%. The pretreatment includes conventional crushing, grinding and magnetic separation processes.

[0035] 2) Calculate the mass ratio of the serpentine mineral powder obtained in step 1) based on the molar ratio of MgO and ammonium bisulfite being 1:5, weigh the material and mix and stir evenly; after roasting at 800°C for 0.2h, the obtained Roasting products and tail gas; Among them, sulfur trioxide, sulfur dioxide or ammonia in the tail gas are collected by conventional sulfuric acid solution absorption method.

[0036] 3) post-treatment the roasted product obtained in step 2); wherein the post-treatment includes leaching, filtering and washing steps; Mix in a device with a stirrer to extract the sulfate in the roasted product; a...

example 2

[0040] This implementation example selects serpentine tailings as raw material; its preparation method is basically the same as Example 1, and will not be repeated here; its difference is:

[0041] 1) crushing, grinding, and magnetically separating the serpentine tailings to obtain serpentine powder, the particle size of which is 600 mesh, and the mass percentage of MgO in the serpentine powder is 30%;

[0042] 2) Calculate the mass ratio of the serpentine ore powder obtained in step 1) according to the molar ratio of MgO and ammonium bisulfate as 1:0.5, weigh the material and mix and stir evenly; put it into a temperature-controlled reaction with an exhaust gas collection device In the device, the reaction was roasted at 110° C. for 4 hours; the gas generated during the reaction was collected by conventional sulfuric acid solution absorption method.

[0043] 3) post-processing the roasted product obtained in step 2); wherein the post-treatment includes leaching, filtering and...

example 3

[0047] This example chooses chrysotile tailings as raw material. Its preparation method is basically the same as Example 1, and will not repeat them here; its difference is:

[0048] 1) Crushing, grinding, and magnetically separating the chrysotile tailings to obtain chrysotile tailings ore powder, the particle size of which is 200 mesh, and the mass percentage of MgO is 35%;

[0049] 2) Calculate the mass ratio of the chrysotile tailings powder obtained in step 1) according to the molar ratio of MgO and sodium bisulfate as 1:3.0, weigh the material and mix and stir evenly; put it into a temperature control system with a tail gas collection device In the reaction device, the reaction was roasted at 380° C. for 2 hours; the tail gas generated during the reaction was collected by conventional sulfuric acid solution absorption method.

[0050] 3) post-treatment the roasted product obtained in step 2); wherein the post-treatment includes leaching, filtering and washing steps; Mi...

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Abstract

The invention discloses a method for extracting magnesium oxide and preparing an active porous silicon dioxide material by using serpentine. The method comprises the steps of 1) carrying out pre-treatment on a serpentine raw material to obtain serpentine mineral powder; 2) mixing the obtained serpentine mineral powder with acidic salt, and roasting to obtain a roasted product and tail gas; 3) performing after-treatment on the roasted product to obtain a crude magnesium sulfate solution and active silicon dioxide residues; 4) separately processing the crude magnesium sulfate solution and the active silicon dioxide residues, wherein the crude magnesium sulfate solution is subjected to a step-by-step precipitation method to obtain a refined magnesium sulfate solution and the active silicon dioxide residues are dried and ground to obtain the active porous silicon dioxide material. The method disclosed by the invention adopts acidic salt as an auxiliary agent which is used for removing metal oxides out of serpentine and has high chemical activity; the method has the advantages that the technological process is simple, the roasting temperature is low, the roasting time is short, energy consumption is low and the magnesium oxide leaching rate is high.

Description

technical field [0001] The invention relates to a method for preparing active porous silicon dioxide material by extracting magnesium oxide from serpentine, which belongs to the fields of development and utilization of non-metallic ore, inorganic non-metallic materials, solid waste treatment, mineral processing and environmental protection. Background technique [0002] Serpentine belongs to the 1:1 type layered silicate, which is composed of silicon-oxygen tetrahedral sheets and magnesium-oxygen octahedral sheets, mainly including chrysotile, antigorite and lizardite. The main mineral composition of serpentinite, serpentine tailings and asbestos tailings is serpentine, containing a small amount of magnetite, talc, brucite, dolomite, calcite and so on. The main chemical composition is SiO 2 , MgO, containing a small amount of Fe 2 o 3 、Al 2 o 3 , NiO, Cr 2 o 3 etc. Among them, magnesium oxide is the main metal oxide. [0003] At present, the common method of serpenti...

Claims

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Application Information

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IPC IPC(8): C01F5/40C01B33/12
Inventor 彭同江宋鹏程孙红娟陈吉明
Owner SOUTHWEAT UNIV OF SCI & TECH
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