Device for preparing magnesium oxide by saturated brine spray pyrolysis

Abstract

The invention relates to a device for preparing magnesium oxide by saturated brine spray pyrolysis, which comprises a pyrolyzing furnace, a hot-air system and a feed system, wherein the pyrolyzing furnace is a self-made brick / silicon carbide hearth mixed structure; the hot-air system comprises an air compressor, a liquefied petroleum gas tank, a controller, an air liquefied gas premixing pipe, combustion fire lances, an igniter and an instrument system; the feed system is composed of a storage tank, a diaphragm pump, a pipeline and a sprayer; the upper part of the cone is provided with the combustion fire lances (every two combustion fire lances form a 120-degree angle) and additionally provided with a flame detector; the coal gas enters the premixing pipe to be mixed with air under the control of a solenoid valve, and is combusted at the outlets of the combustion fire lances so as to supply heat; the bottom of the whole device is provided with a discharge port, and the top is provided with four openings; and the discharged substance is subjected to dust removal by a ceramic filter and directly absorbed by the saturated alkali solution, thereby producing no environmental pollution. The device can generate the magnesium oxide product by direct spray pyrolysis of saturated brine, and has the advantages of simple technical process, low input cost and favorable product performance.

Description

【Technical field】 [0001] The invention relates to the technical field of inorganic chemical industry. Specifically, it relates to a device for preparing magnesium oxide by spray pyrolysis of saturated brine. 【Background technique】 [0002] Magnesium oxide is an inorganic chemical product with important industrial uses among magnesium salt products. It is widely used in the fields of catalysis, ceramics, plastics and rubber. [0003] Qinghai Chaerhan Salt Lake, located in the central and eastern part of the Qaidam Basin in my country, has more than 3 billion tons of magnesium chloride reserves, ranking first in the country and accounting for 74% of the country's magnesium salt resources. The development and utilization of potassium resources in Chaerhan Salt Lake has produced a large amount of magnesium chloride as a by-product. The annual discharge of old brine containing 33% of magnesium chloride has reached 64 million cubic meters, and the content of chloromagnesite has e...

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Problems solved by technology

[0005] At present, the traditional method of preparing magnesium oxide in my country is mainly the calcination method of solid ore magnesite. This method has simple process and low cost, but the product has high impurity content and is difficult to remove, and will produce a large amount of carbon dioxide, polluting the environment.

The preparation of magnesium oxide from salt lake brine is mainly through precipitation methods such as ammonium bicarbonate method and milk of lime method. The process and equipment are complicated and the cost is high.

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