SU945072A1 - Process for producing magnesium hydroxide - Google Patents

Description

(Sf) METHOD FOR MAKING MAGNESIUM HYDROXIDE

one

The invention relates to the production of magnesium hydroxide from seawater and can be used in the chemical industry in the preparation of magnesium hydroxide.

A known method of producing magnesium hydroxide by treating ocean water with lime milk in the presence of polyethylene glycol esters of higher fatty alcohols 1 surfactants.

The disadvantage of this method is low sedimentation rate of magnesium hydroxide. The most similar to the proposed technical essence and the achieved result is the method of obtaining hydroxide of magnesium, including the treatment of sea water with lime MOLOKM in the presence of an organic additive - polyvinyl acetate emulsion with subsequent separation of sediment by settling. Maximum speed

settling of sediment is in this case 0.85 m / h 2.

The disadvantage of this method is the low rate of sedimentation of the product.

The aim of the invention is to accelerate the step of settling magnesium hydroxide.

The goal is achieved, including the treatment of seawater with lime milk in the presence of sulfoethylamino-cistate, taken in an amount of 0.001-0.1 wt.%, Followed by separation of the precipitate by settling.

The technology of the method is as follows

In seawater containing magnesium, is introduced at room temperature.

20 0,001-0,1 weight.% Sulfoethylaminoacetate and with stirring, process the mixture with lime milk. The precipitate formed is then separated.

magnesium hydroxide by thawing. The introduction of sulfoethylaminoacetate into seawater contributes to the formation of single crystals of Md (it) (2, easily separated by settling. Experimentally established the feasibility of maintaining the concentration of the specified additive in seawater equal to 0.0010, 1 weight. Introduction of sulfoethylaminoacetate in an amount less than 0.001 weight does not accelerate the sedimentation stage, an increase in the input amount of the additive more than 0.1 wt.% leads to a decrease in the sedimentation rate of the magnesium hydroxide precipitate to values obtained by a known method and lower e.

Example 1. V. 1. L of sea water containing 1.32 g / l of magnesium is introduced at room temperature at 0.001 wt. sulfoethylaminoacetate. Then the resulting mixture with stirring, is treated with 10 ml of 10 | -th of whole milk. The contents of the flask are poured into a cylinder in which the resulting magnesium hydroxide is separated by settling. The rate of settling in this case is 0.9 m / h versus 0.85 m / h by a known method.

Example. The method is carried out analogously to Example 1, but 0.05 wt.% Of sulfoethylaminoacetate is introduced into the sea water. The sedimentation rate of the magnesium hydroxide precipitate is 0.97 m / h versus 0.85 m / h by a known method.

Example 3 The method is carried out analogously to example 1, but 0.1 weight of sulfoethylaminoacetate is introduced into seawater. The sedimentation rate of sediment Md (OH) (2. Is 1.02 m / h versus 0.85 m / h by a known method.

An example. The method is carried out analogously to example 1, but 0.2 weight is introduced into seawater, I of sulfoethylaminoacetate. In this case

a decrease in the rate of settling to 0.72 m / h versus 0.85 m / h according to a known method is observed.

Thus, the proposed method for the preparation of magnesium hydroxide allows to accelerate the sedimentation of the precipitate during the separation of the product, since the rate of sedimentation in it is 0.9-1.2 m / h, against 0.85 m / h by a known method.

invention formula

A method of producing magnesium hydroxide, which includes the treatment of seawater with lime milk in the presence of an organic additive followed by separation by settling, in order to accelerate the stage of settling using sulfoethylaminoacetate in the amount of 0.001-0.1% by weight ..

Sources of information taken into account in the examination

1. USSR author's certificate No. 429021, kp. C 01 F 5/22, 1371.

2, USSR author's certificate

N- i 5l627, cl. C 01 F 5/22, 1972 (prototype).

Claims (1)

Claim A method of producing magnesium hydroxide, including treating seawater with milk of lime in the presence of an organic additive, followed by separation of the precipitate by settling, characterized in that, in order to accelerate the settling stage, sulfoethylamino acetate is used as an organic additive in an amount of 0.001-0.1 wt.? .