SU1359339A1 - Method of obtaining phosphating concentrates - Google Patents

Abstract

The invention relates to the field of protecting metals from corrosion, in particular, to a method for producing phosphate concentrates, and can be used in the chemical industry. The aim of the invention is the disposal of waste boric acid production and the reduction of environmental pollution. The method according to the invention involves the dissolution of the mother liquor in the production of boric acid and the subsequent introduction of zinc oxide. Reduction of environmental pollution and utilization of waste products of boric acid production is achieved by using as a modifying-Shch1-GC additives of the mother liquor in the production of boric acid and a certain sequence of operations, 2 tab. $ S (L SO eaten with soy with so

Description

1-1

The invention relates to the preparation of phosphate concentrates for the preparation of phosphate coatings on the surface of metals, and can be used in the chemical industry.

The purpose of the invention is the disposal of waste products of boric acid and the reduction of environmental pollution.

The invention is illustrated by the following examples.

Two layer-forming and one non-layer-forming concentrate were prepared. For comparison, concentrates of the same composition are prepared by technology. The preparation of the concentrates is carried out as follows. Mix the calculated amount of acid and uterus

or zinc oxide or soda and additives. To prepare the concentrates of 1.35.5, use is made of a boric acid mother liquor of the following composition, wt%:

, 77

55

 NO; 5.55

5.0 1.4 0.08 R ,, 56 (R Fe20g +

+ A1gO,).

The number of components required to obtain 100 kg of phosphate concentrate and the analysis of the resulting concentrates are shown in Table 1.

Table 1

P, 0,, 30,

To assess the effect of the preparation of phosphate concentrates on the quality of the phosphate coating in solutions of these concentrates, standard samples of metal from steel 08 kp were processed. The processing modes and properties of the coatings are summarized in table 2. As can be seen from table 2, covered. The tin obtained from the solution concentrates prepared on the mother liquor is not inferior in quality to the coatings obtained using conventional phosphate concentrates.

Table 2

Editor I. Segl Nick

Compiled by A. Bordachev

Tehred M. Khodanich Proofreader A.Obruchar

Order 6118/28. Circulation 937 Subscription VNIIPI USSR State Committee

for inventions and discoveries 113035, Moscow, Zh-35, Raushsk nab., 4/5

Production and printing company, Uzhgorod, st. Project, 4

Table continuation

Thus, the proposed method makes it possible to completely utilize waste products of boric acid, reduce environmental pollution, and reduce the costs of pure chemical raw materials.

Claims (1)

Invention Formula A process for preparing phosphate concentrates, comprising dissolving zinc oxide in a mixture of nitric and phosphoric acids and introducing modifying agents, characterized by In order to utilize waste products of boric acid and reduce environmental pollution, a mother solution is used as modifying additives in the production of boric acid, which is dissolved in a mixture of nitric and phosphoric acids, after which zinc oxide is introduced.