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Method for preparing magnesium hydroxide and calcium hydroxide flame retardant from dolomite

A technology of magnesium hydroxide and calcium hydroxide, which is applied in the direction of magnesium hydroxide, calcium/strontium/barium oxide/hydroxide, etc., can solve the problems of cumbersome process and unavoidable large amount of waste liquid, and achieve simple process and easy The effect of industrialization and widening the way of development and utilization

Pending Publication Date: 2021-09-07
LANZHOU JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN109354050A discloses a method for preparing calcium carbonate and magnesium hydroxide by using dolomite. The product has high purity and high utilization efficiency of dolomite, but the process is cumbersome
Patent CN201310705065.1 discloses a method for preparing magnesium hydroxide by leaching calcined dolomite in water. The process is relatively simple, but it is difficult to avoid the generation of a large amount of waste liquid in the preparation process.

Method used

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  • Method for preparing magnesium hydroxide and calcium hydroxide flame retardant from dolomite
  • Method for preparing magnesium hydroxide and calcium hydroxide flame retardant from dolomite

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Embodiment 1

[0024] Embodiment 1: Weigh 30g of dolomite powder in a high-temperature crucible, place it in a high-temperature energy-saving box-type furnace at 950°C for calcination for 90 minutes, pass through a 200-mesh sieve after cooling for later use, and put a certain amount of calcined dolomite powder into a steamer. Keep it in a high-temperature steam environment for 1 hour, take it out and dry it in an oven at 80°C.

Embodiment 2

[0025] Embodiment 2: Weigh 30g of dolomite powder in a high-temperature crucible, place it in a high-temperature energy-saving box furnace at 950°C for calcination for 90 minutes, pass through a 200-mesh sieve after cooling, and put it into a steamer for subsequent use. Keep it in a high-temperature steam environment for 2 hours, take it out and dry it in an oven at 80°C.

Embodiment 3

[0026] Embodiment 3: Weigh 30g of dolomite powder in a high-temperature crucible, place it in a high-temperature energy-saving box furnace at 950°C for calcination for 90 minutes, pass through a 200-mesh sieve after cooling, and put it into a steamer for subsequent use. Keep it in a high-temperature steam environment for 3 hours, take it out and dry it in an oven at 80°C. The basic principles and main features of the present invention and the advantages of the present invention have been shown and described above.

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Abstract

The invention relates to the technical field of chemical engineering, and in particular, relates to a method for preparing a magnesium hydroxide and calcium hydroxide flame retardant from dolomite, wherein the method comprises the following steps: calcining crushed dolomite powder in a high-temperature furnace at 750 DEG C-950 DEG C for 60 min-90 min to obtain calcined white powder mainly comprising magnesium oxide and calcium oxide, and sieving with a 200-mesh sieve for later use; transferring calcined white powder obtained by calcining into a steamer, and fully reacting in a steam environment of 90-110 DEG C to obtain magnesium hydroxide and calcium hydroxide; and drying the obtained hydroxide flame retardant in an oven at the temperature of 70 DEG C-80 DEG C to remove surface moisture. The method has the beneficial effects that dolomite with abundant resource reserves is adopted as the raw material, so that the development and utilization approach of dolomite mineral resources is widened; and the preparation method is simple and convenient in process, magnesium hydroxide and calcium hydroxide flame retardant products are obtained through a one-step method, generation of a large amount of waste liquid is avoided, and the preparation method is green, environmentally friendly and easy to industrialize.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for preparing magnesium hydroxide and calcium hydroxide flame retardants from dolomite. Background technique [0002] Hydroxide flame retardants represented by magnesium hydroxide have triple functions of flame retardancy, smoke suppression and filling, and are widely used in the rubber and plastics industry. The common preparation methods of magnesium hydroxide mainly include brine-lime method, brine- Ammonia water method, magnesite-hydrochloric acid-ammonia water method, concentrated seawater and salt lake water extraction method, etc., the preparation process is cumbersome, the cost is high, and it does not conform to the concept of environmental friendliness. [0003] The chemical composition of dolomite is CaMg(CO 3 ) 2 , is a natural carbonate mineral, which can be decomposed into a mixture of carbon dioxide, calcium oxide, and magnesium oxide after bei...

Claims

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Application Information

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IPC IPC(8): C01F5/14C01F11/02C04B2/00C04B2/02
CPCC01F5/14C01F11/02C04B2/00C04B2/02
Inventor 黄大建郭鑫欧阳成伟赵鸿强小虎
Owner LANZHOU JIAOTONG UNIV
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