Yuanchu Technology (beijing) Co., Ltd.

Tsinghua University

Changjun Yu

Qi Wang

Jiantao Zhang

Haichuan Ding

Guoqiang Jiang

Disclosed is a method for preparing ammonia gas through a reaction between an ammonium salt and a silicate. An aqueous solution of the ammonium salt in the form of atomized droplets is contacted with a silicate at a high temperature for a reaction to generate ammonia gas and a solid substance. The silicate can be solid particles, and forms a bed. The generated ammonia gas is collected, the solid substance is extracted, part of the same solid substance is mixed with a fresh silicate solid particle, and the mixture continuously reacts with the atomized droplets of the aqueous solution of the ammonium salt.

Method for preparing ammonia by using ammonium salt and silicate

Disclosed are a preparation device and a preparation method of ammonia gas. The preparation device, prepares ammonia gas by reacting ammonium chloride with a particulate inorganic salt, includes one fluidized bed reactor with at least two fluidization chambers, in which one is a preheating chamber configured to preheat the particulate inorganic salt, and the other is a reaction chamber inside provided with at least one atomizing nozzle, the particulate inorganic salt forming a fluidized bed layer and reacting with an aqueous solution of ammonium chloride in the reaction chamber to generate the ammonia gas. The particulate inorganic salt can be sequentially flowed through a plurality of preheating chambers and reaction chambers under an impetus of a density difference of the particulate bed layers, finally achieving the required conversion rate.

Preparation device and preparation method of ammonia gas

Provided is a system and a method for preparing ultrafine silica by leaching silicate ore using hydrogen chloride gas, comprising an ore raw material feeding device, an ejector, a stirring tank and a liquid-solid separation device. A circulated material outlet of a stirred tank is connected with a liquid inlet of an ejector through a circulation pipe; a liquid outlet of the ejector is connected with a circulated material inlet of the stirred tank; a material outlet of a raw ore feeding apparatus is connected with the circulation pipe; and the circulated material outlet of the stirred tank is connected with a solid-liquid separation apparatus. Based on the system and method in the present disclosure, an industrially feasible solution for preparing silica by continuously leaching a silicate ore is provided. The dissolution efficiency of ores and the utilization of hydrochloric acid are greatly increased.

System and method for preparing ultrafine silica by leaching silicate ore using hydrogen chloride gas

The present invention relates to an apparatus for absorbing and mineralizing carbon dioxide comprising a reactor and a three-phase separator, in which said reactor comprises a tower body and a draft tube disposed inside the tower body, a liquid inlet pipe and a gas intake pipe being disposed on the tower body, the outlet ends of the liquid inlet pipe and the gas intake pipe both being located inside the draft tube; and the three-phase separator is disposed at the upper end of the reactor, and a method therefor. The arrangement of draft tube inside the reactor of the present invention, enhances gas-liquid-solid mixing state because of the flow with airlift loop flow inside the reactor, accelerates the dissolution rate of solid alkali solute and thus may increase absorption reaction rate and absorptivity; the integration of three-phase separator in the reaction apparatus may isolate carbonate by settling while reacting, reduce solid content of the solution, while reducing the circulation of water between absorption and separation units, improve process performance, reduce process energy consumption; carbonate particles generated can be controlled better, thus a higher settling efficiency can be obtained.

Growing community of inventors

Beijing, China

Changjun Yu