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Method for preparing basic magnesium chloride whisker from dolomite and bittern

A technology of magnesium chloride and bittern, which is applied in the field of compound preparation, can solve the problems of unreasonable utilization of bittern, and achieve the effect of low price, wide sources, and realization of recycling and recycling

Inactive Publication Date: 2009-01-28
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although there are many technical solutions for comprehensive utilization at present, due to factors such as cost and benefit, there are still a considerable amount of bittern that has not been rationally utilized.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0014] The present invention proposes a method for preparing basic magnesium chloride whiskers by using dolomite and bittern as raw materials, making full use of the dolomite and bittern resources which are rich in resources but not high in utilization in my country, and has simple technological process and low production cost . The specific implementation method comprises the following steps:

[0015] The first step of preparation is to fully crush the dolomite and calcinate it in a furnace at 800-1600°C for 3-12 hours. During the calcining process, the dolomite gradually removes CO 2 , to obtain calcined dolomite powder with the general chemical structure formula (Mg, Ca)O, which contains a small amount of SiO 2 , Fe 2 o 3 、Al 2 o 3 and other minor components:

[0016] (Mg,Ca)CO 3 →(Mg,Ca)O+CO 2 ↑ (1)

[0017] The second step of preparation is to add fully broken dolomite into 0.2-5M HCl solution, control the mass ratio of solution to dolomite to 4-100, stir and reac...

Embodiment 1

[0026] Example 1: Preparation of basic magnesium chloride whiskers from salt lake bittern and dolomite.

[0027] Raw material 1: bittern from a salt lake in a certain place, the chemical composition is: MgSO 4 =70g / L, MgCl 2 =165g / L, NaCl=90g / L, KCl=20g / L. Raw material 2: a dolomite mine in a certain place, the chemical composition of the ore is: dolomite 91.3%, SiO 2 =3.3%, Al 2 o 3 = 0.6%; Fe 2 o 3 =0.3%; acid-insoluble impurities 4.5%.

[0028] 1) The dolomite is fully crushed and calcined in a furnace at 800°C for 12 hours to obtain dolomite to remove CO 2 The calcined product, its general chemical structure is (Mg, Ca)O;

[0029] 2) Put the fully broken dolomite in 0.2M HCl solution, the mass ratio of the solution to the dolomite is 100; stir and react at 30°C for 60 minutes, and filter out the insoluble residue to obtain the dolomite acid solution;

[0030] 3) Mix dolomite acid solution and bittern in a weight ratio of 15:1, so that Ca in the solution 2+ Ions a...

Embodiment 2

[0032] Example 2: Preparation of basic magnesium chloride whiskers from sea salt bittern and dolomite ore.

[0033] Raw material 1: sea salt bittern from a certain place, chemical composition: MgSO 4 =75g / L, MgCl 2 =311g / L, NaCl=52g / L, KCl=5g / L. Raw material 2: dolomite ore in a certain place, the ore chemical composition is identical with embodiment 1.

[0034] 1) Fully crush the dolomite and calcinate it in a furnace at 1600°C for 3 hours to obtain dolomite to remove CO 2 The calcined product, its general chemical structure is (Mg, Ca)O;

[0035] 2) placing the fully broken dolomite in a 5M HCl solution, the mass ratio of the solution to the dolomite is 4; stirring and reacting at 90°C for 15 minutes, and filtering off the insoluble residue to obtain a dolomite acid solution;

[0036] 3) Dolomite acid solution and bittern are mixed in a weight ratio of 1:2, so that Ca in the solution 2+ Ions and SO 4 2- The molar ratio of ions is 1:1, and the purified bittern is obtai...

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Abstract

The invention discloses a method for preparing basic magnesium chloride crystal whiskers taking dolomite and bittern as raw materials. The method mainly comprises the following steps: roasting and acidization treatment are carried out to natural dolomite firstly to respectively obtain dolomite roasted powder and dolomite solution; the dolomite solution is mixed and reacts with the bittern to remove sulfate ions from the bittern and obtain a mixed solution; the mixed solution reacts with the dolomite roasted powder by a certain ration, and the basic magnesium chloride crystal whiskers are obtained after aging, and waste liquid produced in the preparation process can be recycled and reused. The method for preparing basic magnesium chloride crystal whiskers provided by the invention takes dolomite and bittern as raw materials which are widely available and cheap, the production technology is simple, recycle of resource is realized, calcium and magnesium resource of the dolomite and the bittern is fully used, the basic magnesium chloride crystal whiskers obtained are a filling agent and flame retardant with wide application prospect.

Description

technical field [0001] The invention relates to a preparation method of a compound, in particular to a method for preparing basic magnesium chloride whiskers by using dolomite and bittern as raw materials. Background technique [0002] Dolomite is an important calcium and magnesium resource on the earth, and it has extremely rich reserves in my country. However, the development and utilization of dolomite in my country is very low at present, and most mines only sell raw ore or forged dolomite powder. Bittern is seawater, salt lake water, underground salt brine that is evaporated and concentrated to produce table salt (NaCl) or Glauber's salt (NaCl). 2 SO 4 10H 2 O) after residual solution, the dissolved component that it contains is mainly MgCl 2 , followed by MgSO 4 , NaCl and KCl, in addition to MgBr 2 and other minor components. After seawater or brine from other sources is evaporated by sunlight to obtain NaCl, it is difficult to further concentrate by evaporatio...

Claims

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Application Information

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IPC IPC(8): C30B29/12C30B29/62C01F5/30
Inventor 叶瑛陈雪刚吕双双夏枚生高奇东姚志通张路
Owner ZHEJIANG UNIV
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