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use h 2 so 4 -A method for combined treatment of serpentine by fluorination

A combined treatment and serpentine technology, applied in the direction of silicon oxide, silicon dioxide, process efficiency improvement, etc., can solve the problem of low leaching rate and achieve the effect of improving the leaching rate of metal ions

Active Publication Date: 2020-04-03
SHANGHAI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] For SiO in the sulfuric acid leaching process 4 The lamellar structure formed by the tetrahedron will cover the mineral surface in the form of a product layer, so that the leaching reaction is limited by the diffusion control of the product layer (SiO 4 ), leading to low leaching of magnesium (or iron, nickel, calcium, aluminum, and chromium)
[0010] But there is no H 2 SO 4 -Related reports on the joint treatment of serpentine by fluorination, how to realize low-cost serpentine treatment has become a technical problem to be solved urgently

Method used

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  • use h <sub>2</sub> so <sub>4</sub> -A method for combined treatment of serpentine by fluorination
  • use h <sub>2</sub> so <sub>4</sub> -A method for combined treatment of serpentine by fluorination
  • use h <sub>2</sub> so <sub>4</sub> -A method for combined treatment of serpentine by fluorination

Examples

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Effect test

Embodiment 1

[0037] In this example, see figure 2 , a method using H 2 SO 4 -The method for the combined treatment of serpentine by fluorination, comprising the steps of:

[0038] a. leaching the pretreated serpentine with sulfuric acid, then filtering to realize solid-liquid separation, and collecting the solid residue retained after filtering to obtain SiO-containing 2 The serpentine residue; The pretreatment serpentine condition in said step a is:

[0039] After the serpentine is crushed, ball milling is carried out, and all particle sizes are sieved through a 200-mesh sieve to obtain serpentine powder, and then the serpentine powder is calcined at 700°C for 15 minutes. Obtain the calcined pre-activated serpentine powder;

[0040] The leaching conditions of pretreatment serpentine and sulfuric acid:

[0041] The solid-liquid mass and volume ratio of pretreated serpentine and sulfuric acid is 0.1:10 (g / mL), the stirring speed of the pretreated serpentine and sulfuric acid mixture i...

Embodiment 2

[0057] This embodiment is basically the same as Embodiment 1, especially in that:

[0058] In this example, a H 2 SO 4-The method for the combined treatment of serpentine by fluorination, comprising the steps of:

[0059] a. leaching the pretreated serpentine with sulfuric acid, then filtering to realize solid-liquid separation, and collecting the solid residue retained after filtering to obtain SiO-containing 2 The serpentine residue; The pretreatment serpentine condition in said step a is:

[0060] After the serpentine is crushed, ball milling is carried out, and all particle sizes are sieved through a 100-mesh sieve to obtain serpentine powder, and then the serpentine powder is calcined at a temperature of 500°C, and the calcining time is 180 minutes. Obtain the calcined pre-activated serpentine powder;

[0061] The leaching conditions of pretreatment serpentine and sulfuric acid:

[0062] The solid-liquid mass and volume ratio of the pretreated serpentine and sulfuric...

Embodiment 3

[0069] This embodiment is basically the same as the previous embodiment, and the special features are:

[0070] In this example, a H 2 SO 4 -The method for the combined treatment of serpentine by fluorination, comprising the steps of:

[0071] a. leaching the pretreated serpentine with sulfuric acid, then filtering to realize solid-liquid separation, and collecting the solid residue retained after filtering to obtain SiO-containing 2 The serpentine residue; The pretreatment serpentine condition in said step a is:

[0072] After the serpentine is crushed, ball milling is carried out, and the size of the particles is all passed through a 200-mesh sieve to obtain the serpentine powder;

[0073] The leaching conditions of pretreatment serpentine and sulfuric acid:

[0074] The solid-liquid mass and volume ratio of pretreated serpentine and sulfuric acid is 0.1:10 (g / mL), the stirring speed of the pretreated serpentine and sulfuric acid mixture is 500rpm, the temperature is 80°...

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Abstract

The invention discloses a method for treating serpentine by utilizing a H2SO4-fluorination combination method, the H2SO4-fluorination combination method is used to treat the serpentine, the leaching rate of metal ions is improved, SiO2 can be recycled, and the method belongs to the fields of mines, metallurgy, chemical engineering and environment. According to the method for treating the serpentine by using the H2SO4-fluorination combination method, firstly pretreated serpentine is leached by using sulfuric acid, then filtering is carried out, solid-liquid separation is realized, filtered serpentine solid residue containing the SiO2 reacts with ammonium fluoride, then filtering is carried out again, a solid after being filtered for the second time is reacted with a first leaching solution,a liquid after being filtered for the second time is reacted with the solid after being filtered for the first time, the serpentine is repeatedly treated by the H2SO4-fluorination combination method,and the method has important significance for resource utilization of the serpentine.

Description

technical field [0001] The invention relates to a treatment method for leaching serpentine, in particular to a method for extracting magnesium from leaching serpentine, which is applied in the technical fields of mining, metallurgy, chemical industry and environment. Background technique [0002] The serpentine ore with huge reserves in my country has a general chemical formula that can be expressed as Mg 6 Si 4 o 10 (OH) 8 The 1:1 layered structure of silicate minerals. Its chemical composition is shown in Table 1, the main components are magnesium oxide and silicon dioxide, and its mass accounts for about 80% of the serpentine ore. It is mainly distributed in Mangya area, Qilian county, Xiaobabao and Heicigou. The serpentine unit structure layer (crystal layer) is composed of a layer of silicon-oxygen tetrahedral sheets and a layer of magnesia octahedral sheets, and the octahedral gaps are filled with magnesium. In the structural unit layer, the internal and external...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/08C22B3/44C22B26/22C01B33/12C01F5/40
CPCC01B33/12C01F5/40C22B3/08C22B3/44C22B26/22Y02P10/20
Inventor 朱萍李祖良杨亚政钱光人王杨君
Owner SHANGHAI UNIV
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