Production process and application of magnesium hydroxide suspension with high solid content

Abstract

The invention provides a production process of a magnesium hydroxide suspension with high solid content. The production process comprises a crushing step and a pulping and blending step. The inventionalso provides application of the magnesium hydroxide suspension with high solid content. The magnesium hydroxide suspension is used for treatment of flue gas discharged by ships. The invention has the beneficial effects that the magnesium hydroxide suspension is good in suspension performance, low in viscosity and stable and uniform in quality, and has a viscosity in a range of 139.8 mPa.s to 1571.2 mPa.s; under the condition of standing for 7 days, the solid content change of slurry at an upper layer, a middle layer and a lower layer of the suspension is not more than 1.8%, the maximum solidcontent difference among all layers is not more than 2.45%, and the phenomena of deposition and scaling at the bottom of a container are avoided; when the magnesium hydroxide suspension is used for desulfurization of ship flue gas, good desulfurization effect is obtained, and the strictest emission standard requirements on sulfur oxide in ship flue gas can be met; i.e., the emission effects thatan S / C value in ship exhaust gas detection is less than 4.3 and the S content in fuel oil is less than 0.1% are achieved.

Description

technical field [0001] The invention relates to the field of magnesium hydroxide, in particular to a production process and application of a high-solid-content magnesium hydroxide suspension. Background technique [0002] Magnesium hydroxide is the third largest magnesium chemical after magnesia and light-burned magnesia in magnesium chemicals. It is favored and respected by developed countries in the process of implementing sustainable development strategies, protecting the environment, and benefiting ecological development. one of the products. Magnesium hydroxide is known as a green and safe neutralizer, an environmentally friendly flame retardant and a third alkali. Magnesium hydroxide can be divided into three categories: filter cake, powder and slurry according to its shape and use, and the three can be transformed into each other. Among them, magnesium hydroxide suspension has many unique properties such as simple production process, high activity, high adsorption c...

AI Technical Summary

Problems solved by technology

The disadvantage of this patent: when the slurry magnesium hydroxide is used in ship flue gas desulfurization, the slurry magnesium hydroxide stored in the container is easy to settle after standing for a long time, resulting in low solid content of the slurry and poor flue gas desulfurization. The effect is not good; in order to maintain a good suspension, it needs to be stirred all the time, which increases equipment and labor costs

The disadvantage of this patent is that the dry magnesium oxide powder stored in the cabin is prone to moisture and agglomeration, resulting in poor suspension of the magnesium hydroxide suspension that is currently prepared on board, and is easy to deposit at the bottom of the equipment, affecting the overall desulfurization performance

The disadvantages of this patent: the preparation process of magnesium hydroxide suspension is cumbersome, the reaction time is long, the cost is high, the particle size of magnesium hydroxide is large, the suspension and dispersibility are not good, and it is easy to precipitate and scale in the container

[0009] (1) The existing high-solid content magnesium hydroxide suspension has poor stability and is easy to deposit and scale at the bottom of the equipment, which affects its use effect;

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