SU143783A1 - The method of purification of drilling water in obtaining from her iodine - Google Patents

Description

The use of ferric salts and, above all, ferric chloride for purifying drilling waters is well known.

However, the method of purification of drilling waters with the use of ferric chloride is not used in practice because of the large amount of ferric chloride required to precipitate naphthenic acids.

A method is proposed for purifying drilling waters, which serve as raw materials for the extraction of iodine, by treating them with a solution of ferric salts. For this purpose, ferric chloride is used, as well as a solution of ferrous salts, obtained by treating with sulphuric acid a precipitate that precipitates during the treatment of the drilling water with iron salts. In the process of purification of drilling water according to the proposed method, naphthenic acids, as well as other organic substances that react with oxidizing agents, are removed in it. At the same time reduce the alkalinity of water.

The main difference and advantage of the proposed method of water purification is the replacement of naphthenate and basic iron salts with the repeated use of chloric acid solution (or sulphate; iron) and the removal of various reducing agents formed during the fermentation of drilling water in pools.

Scheme of installation for the purification of drilling water is shown in the drawing. Water, before feeding it to the process, is mixed with a solution of ferric chloride in the pressure tank / and, after mixing, is fed through the central tube 2 into the lower part of the suspension sump 3.

As a result of the interaction of drilling water with ferric chloride, iron naphthenate and basic iron salts are formed, forming an easily settled suspension at the top of the settling tank, and a sediment at the bottom.

No. 143783-2 Pry soda through a perforated grate — and then the suspension layer suspended in the bottom of the sump, the water is cleared from impurities and from the precipitated sediment.

; A clear layer of water is formed by a suspended layer of sediment; from KOTOpdrb pure water flows continuously along channel 5.

The upper level of the suspended sediment is fixed by the lower edges of the OKO 6, through which the excess sediment flows and condenses in the lower part of the settler, from which it is continuously withdrawn into the receiving tank 7 for regeneration.

Sulfuric acid is used to regenerate the sludge, which is fed into the receiving tank 7, as a result of which ferric sulphate solution and naphthenic acids are formed.

The products of regeneration enter the tank 8, from which the solution of iron sulphate is pumped to the pressure tank .9 to the treatment tank.

Thus, the consumption of reagent for water purification is determined by the loss of iron during the cleaning process, which is from 2 to 4% of the initial amount. The initial consumption of ferric chloride for water of the Ramanin workshop of the Baku Iodine Plant is 0.25 g / l of water. The required amount of ferric chloride is fed from tank 10 by pump 9 to tank.

The cyclic experiments on the purification of drilling water using a regenerated solution of ferrous sulphate as a reagent showed that with a tenfold sedimentation followed by regeneration, there is no decrease in the activity of the solution.

The test carried out at the Baku Iodine Plant on a small-sized pilot plant of the method for purifying drilling water from impurities, showed the following results:

1) Decrease in alkalinity of 12 mekv1l to 2 mekv / l.

2) Reduction in the content of naphthenic acids — from 1.1 to 0.2 meq / l.

3) Decrease in oxidation capacity - from 18-20 to 2 conventional units.

4) Reducing the amount of mechanical impurities and emulsified oil - until complete purification and clarification of water.

The proposal may be recommended for implementation at the Baku Iodine Plant.

Subject invention

The method of purification of the drilling water, when iodine is obtained from it from the impurity of organic substances using iron salts, is also distinguished by the fact that, in order to reduce the consumption of the reagent, the precipitate deposited during the cleaning process is treated with sulfuric or hydrochloric acid to form in water organic acid. lots.