Introduction to the process of magnesium hydroxide (magnesium carbonate) drying and calcination system:

The process of magnesium hydroxide (magnesium carbonate) drying and calcination system adopts the combination system of our patented product flash dryer and flash fluidized calciner.

Flash drying is a drying method to completely fluidize solids. The drying host has the mechanical, airflow dispersion, and columnar adjustment functions for drying materials. The paste and filter cake materials with high moisture content are added to the drying host and mixed with the heated hot medium. The materials form a double swirl granular fluidization state under the action of hot air and mechanical dispersion. The heat and mass exchange is completed instantly. The dried materials enter the collector to obtain powder products.

The magnesium hydroxide (magnesium carbonate) generated by chemical method is calcined and decomposed into high-purity magnesium oxide. At present, the calciner used is a patented product developed and produced by our company - scintillating fluidized calciner. The scintillation fluidized bed calciner is a type of furnace specially used for the calcination of magnesium hydroxide (magnesium carbonate). The magnesium carbonate filter cake formed after dehydration is dried by the waste heat of the calcination tail gas, and the dried powder enters the calciner to calcine and decompose into high-purity magnesium oxide. The calcination time is 28 seconds, and the calcination temperature is 950~1030 ℃. The product calcined in the flash fluidized bed calciner is superior to the product formed by the traditional process in all indicators, and the purity of the product can reach 99.3~99.7%.

Working principle:

The tail gas produced by the flash fluidized bed calciner after calcining the materials enters the special dryer. The filter cake like magnesium hydroxide (magnesium carbonate) with a water content of 45~50% is sent to the dryer by the feeder, and the powdered magnesium hydroxide (magnesium carbonate) formed by the dispersion and drying enters the flash fluidized bed calciner. The hot air generated by coal, natural gas or coal gas enters the calciner, and is mixed with the magnesium hydroxide (magnesium carbonate) sent into the furnace for heat transfer, Heated by hot air at 950~1030 ℃, magnesium hydroxide (magnesium carbonate) is rapidly decomposed into high-purity magnesium oxide after 28 seconds, and the decomposed high-purity magnesium oxide is captured by the trap and enters the storage bin.

Technological process:

Technical specifications:

The annual output of a single scintillating fluidized bed calciner within the series specifications is 50000 tons, 100000 tons, 150000 tons and 200000 tons (can be designed separately according to customer requirements).

Performance characteristics:

1. The calcined materials are uniform and sufficient to produce active magnesium oxide.

2. The equipment system is free of pollution and meets the environmental requirements.

3. Compared with shaft kiln, energy consumption can be saved by 20~30%

4. Convenient operation and high degree of automation

Success stories:

Henan Qinyang Longsheng Calcium Industry Co., Ltd

A company in Qinghai

A company in Gansu

System interface diagram:

Figure 1: Magnesium hydroxide drying and calcination combination system diagram

Figure 2: Magnesium carbonate drying and calcination combination system diagram