SU107150A1 - The method of obtaining boron concentrate from natural brines - Google Patents

Description

A method is known for producing a boron concentrate from natural brines by extracting boron from these brines with magnesium hydroxide or calcium hydroxide.

The peculiarity of the described method lies in the process of obtaining the boron concentrate from natural brines using calcium hydroxide in three stages, which makes it possible to obtain a concentrate with a high boron content.

The process is carried out as follows.

First, the initial brine (for example, Indian brine containing about 0.058% of B2O3) is treated with lime milk; magnesium hydroxide and partially boron are precipitated; by subsequent treatment of the precipitated precipitate with fresh brine, the B2O3 content in it is adjusted to 8-9%.

The resulting boromagnesium concentrate is re-treated with lime milk, and due to the increase in pH, an excess of 50-70 Vo of boron (from bormagne concentrate) is transferred into the solution; the B2Oz content in the resulting solution is from 0.18% to 0.20%.

The solution, containing from 0.18 to 0.20% B2O3, is again treated with lime milk at a temperature of about 95 °, while borcalcium concentrate is precipitated. The washed and dried product contains 25-30% of B2O3 with a degree of extraction of boron from brine of about 60%.

The consumption of lime per ton is about 10 ton.

Subject invention

The method of producing boron concentrate from natural brines containing magnesium salts by treating these brines with lime milk with boron deposited on magnesium hydroxide as bormagne concentrate, characterized in that, in order to increase the content of no. 107150,

holding boron in the final product, boron-magnesium concentrate boron is transferred into the solution by treating it with lime milk and the resulting intermediate mixture, further, is further treated with lime milk with boron-rich boron-enriched boron-rich milk. . -