SU1466793A1 - Method of floation of magnesite ores - Google Patents

Description

The invention relates to the field of mineral processing and can be used in the flotation of magnesite

Ore The purpose of the invention is to increase the yield and quality of magnesite concentrate.

The method of flotation enrichment of magnesite, which includes preconditioning of pulp with a regulator, a depressor and a collector, as a depressor together with sodium hexametaphosphate (GMP) use the product of processing sulfite-yeast brews with nitric acid (KBGM) in the ratio (, 8 2,2): 1, and as a collector - a mixture of the product of the interaction of tall pitch and liquid glass (ZTM-2) with soaps from the refining of methyl esters (EC-1) TAKEN in a ratio of 1: (1.3-0, 77).

The proposed KBZHM depressor was obtained by treating the sulfite yeast brewing liquid concentrate (the KBM of the Arkhangelsk pulp and paper mill with a solids content of 50%) with nitric acid of 70 ° / -th concentration at 55-60 ° C, continuous mixing and subsequent aging In the case of using the sulphite-yeast brewing solid concentrate (KBT), it is necessary to dissolve it in water up to 50% concentration of dry substances and then treat with nitric acid by analogy with CBI. The optimal consumption of nitric acid was 20% by weight of CBJ.

A thicker reaction mass is a dark brown powder, readily soluble in water and having the following characteristics:

Oi O)

WITH

Acid number, m KOH / g 67.32 Iodine number, g J / 100 / g16.69

To obtain the proposed ZTM-2 collector, tall oil pitch is mixed with liquid glass in an autoclave at 180-185 ° C for 1 h, cooled to room temperature. The ratio of tall pitch and liquid glass is 1: 0.43. At room temperature, ZTM-2 is a viscous dark mass, readily soluble in water and easily liquefied when reheated, and is characterized by the following indicators:

Acid number, m g KOH / G 85.36 Essential number, mg / KOH / g 16.75 Iodine number, J / 100 g 106,46

Hydroxyl number, mg KOH / G212.35

Saponification number, mg KOH / g 102.11 Reagent EK-1 is a soap obtained in the process of refining methyl esters of synthetic fatty acids fraction C, o, which is a product formed by processing the crude methyl esters of FLC C "-Ct an aqueous solution of sodium hydroxide and consisting of sodium soaps FLC C, -C, g and methyl esters FLC C, o-C ,.

In terms of physico-chemical parameters, these soaps should meet the requirements of technical conditions:

Outward appearanceMaselike mass

Brown colour

Mass dol,%:

fatty acids Not less than 24 methyl esters Not more than 6 waters Not more than 70 Using soaps from the refining of methyl esters of EK-1 allows you to increase the mass fraction of magnesium oxide and concentrate due to its increased selective ability: the combined use of EK-1 and the product of interaction between tall pitch and liquid glass ZTM-2 allows, at a high mass fraction of magnesium oxide in the concentrate, to simultaneously increase its yield.

The proposed set of reagents allows to increase the technological parameters of the flotation process.

When the ratio of the mixture of GMP and CBMH is less than 1.8: 1, calcium-containing impurities are not completely depressed, and the output of the concentrate is less than 2.2: 1.

When the ratio of the mixture of ZTM-2 and EK-1 is less than 1: 1.3, the concentrate yield is low, and more than 1: 0.77, the quality of the concentrate deteriorates (the mass of calcium oxide increases and the magnesium oxide decreases).

The proposed method is carried out as follows.

The original pulp was conditioned with a medium regulator, a depressor, a collector, and then the flotation of magnesite was carried out.

The method was tested under laboratory conditions in the flotation of iron-rich magnesite ores.

The ore is crushed to a particle size of 70-74% of a class of 0.074 mm.

Before the flotation of magnesite, the pulp was desliming over a grain of 15 µm and talc was extracted into the froth product with a T-80 foaming agent.

The flotation of magnesite is carried out with two cleanings of the concentrate.

The flotation regimes are given in the examples 5 pax 1 - 13.

Example 1. Carried out by a known method.

The main flotation of magnesite, kg / kg:

Environment regulator soda0,6-10

Q Hexametaphosphate sodium O, G10 depressors

Carboxymethylcellulose 0,110

Tall oil hardwood

wood species 0,7-U Duration of mixing with re- 5 gates, min:

Regul tor1

Depressor2

Collector2

pulp pH9

T: W1: 3

Duration of flotation, min:

The main 5

I clean-up4

P perechistka4

The concentrate was cleaned 5 without feeding the reagents.

Examples 2-13. The main flotation of magnesite. Depressor - a mixture of GMP and KBZHM; total consumption of 0.225-10 kg / kg; collector mixes spruce tree ZTM-2 and EK-1; total consumption 0, kg / kg; medium regulator soda O b 0 XI0- kg / kg.

In examples 2-6, the ratio of GMP and CBMM changed from 1.65: 1 to 2.46: 1 with a constant ratio of ZTM-2 and EK-1 equal to 1: 1.

5 In Examples 7-13, the ratio of ZTM-2 and EK-1 changed from 1: 3 to 1: 0.33 with a constant ratio of GMP and CBMM equal to 2: 1.

The duration of conditioning with reagents, as well as the duration of flotation 0, are similar to Example 1.

Thus, analysis of the test results shows that using the totality of the proposed reagents as compared to the known ones allows to obtain higher flotation process characteristics: the concentrate yield increases by 9.92% (from 43.48 to 53.4 %% with the GMF ratio: 2: 1, and ZTM-2: EC 1: 1).

0

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with a simultaneous increase in its mass — In addition, the proposed method allows the proportion of magnesium oxide to be 0.6% (with 45.2 liter to replace the deficient reagents, tallodo 45.8%). l Soeo oil and CMC.

Claims (1)

Method of flotation of magnetite ores, including preliminary mixing of hexametaphosphate