SU1585004A1 - Method of dressing phosphorite ores - Google Patents

Abstract

The invention relates to the mining industry and can be used in the technology of enrichment of phosphate ores, in which phosphate is present in particles of fineness over 0.25 mm. The purpose of the invention is to improve the quality of products. The pulp of the crushed starting material is hydrophobized with reagents and fed to a sieve surface with a frequency of 50-100 Hz with a mesh size of 0.5-1.0 mm. Under the sieve serves air with an excess pressure of over 200 mm of water column. At the same time, the content of P 2 O 5 in the oversize product is increased by 1.8–5.2%, and the product itself does not require additional enrichment. The separation boundary is shifted towards the release of smaller particles.

Description

one

(21) 4270183 / 23-03

(22) 04/25/87

(46) 08/15/90. Bul P 30

(71) State Design Institute of Mining Chemistry Gosgorhimproekt

(72) S.G.Perkovich, T.N.Kaitmazova, V.L.Protasov and I.S.Brazhnik

(53) 621.928.25 (088.8)

(56) US Patent 4,220,523, cl. 209-17, published. 09/02/80.

Sukhanova V.G., et al. Pilot-industrial tests of the roar of OGNVG for thin screening. - Tsvetna metallurgists, f 11, 1984, p. 25-26.

(54) METHOD OF ENRICHING PHOSPHORITE

RUD

(57) The invention relates to the mining industry, and m. used in the enrichment technology of phosphate ores, in which phosphate is present in particles larger than 0.25 mm. The purpose of the invention is to improve the quality of products. The pulp of the crushed starting material is hydrophobized with reagents and hearth (from a sieve surface with a screen size of 0.5–1.0 mm, which oscillates with a frequency of 50–100 Hz. Under the sieve, air with an excess pressure of more than 200 mm of water column is fed. the product is increased by 1.8-5.2%, and the product itself does not require additional enrichment. The boundary of separation shifts towards the release of smaller particles.

oh

The invention relates to the mining and chemical industry and can be used in the technology of enrichment of phosphate ores, in which the useful mineral (phosphates) are present in particles of particle size above 0.25 mm.

The purpose of the invention is to improve the quality of products.

The method involves grinding the source material with water, feeding the crushed pulp to a vibrating sieve, removing the separation products, adding reagents to the pulp, applying air to the sieve, taking the size of the cells of the sieve to 0.5-1.0 mm, and vibrating the frequency of 50-100 Hz. Air is supplied at an excess pressure of more than 200 mm of water.

Example. On the screen with the direct excitation of sieve cloth (GNVT-1), pulp is pre-prepared from crushed phosphate rock and water. D: Т: Ж ratio is 1: 1. The initial phosphate ore is first washed on the screen - butare, where ore fines of 0-1 mm with a content of 6-8% are separated from it. The specified roar of GNVT-1 has a width of classifying sieve of 1 m, a length of 2 m, a cell size of 0.5x0.5 mm. The number of vibrators is 13, the power of one vibrator is 100 W, the frequency of the carrier oscillations is regulated during the tests from 50 to 100 Hz. The tilt angle of the screen is chosen to be 25 °. When tested by

.Ј

The following parameters are kept constant: the specific load per grg Hot, t / h.m2 - 5; food content,% - 7; the ratio of W: T in the diet is 1: 1; voltage, B - 150.

The pulp flow is evenly fed to the sifting screen sieve surface and, at the same time, additional water is fed through cyclone-type spray nozzles, maintaining the ratio K) T on a 1: 1 sieve. Prepared slurry before, - Give on the classifying sieve surface of the out-of-frequency screen is hydrophobized with reagents, and when supplied to the sieve surface, additional water (top) and air under the screen surface of the screen are used at an excess; pillar.

Preliminary hydrophobization of the pulp with reagents, as well as supply of air under the classifying sieve of the high-frequency screen, increase the PgOj content in the oversize product by 1.8–5.2%. At the same time, the oversize product does not require additional enrichment. The maximum content is achieved at a frequency of carrier oscillations of the screen surface of 50 Hz and does not change to 100 Hz. In addition, it is noted that the separation boundary shifts towards the release of smaller particles. This can be explained as follows. Due to oscillations of the screen surface with a frequency above 50 Hz, a pumping effect is observed. When the hydrophobic phosphate pulp is classified at the high-frequency screen, the liquid phase leaves almost at a length of 0.5 - 0.7 m (l / A - 1/3 of the screen length). Next on the sieve surface product promotion

0

five

0

five

0

five

0

five

it is dried, which makes it difficult to further classify it.

The air supplied forcedly (or due to the pumping effect) at a frequency of oscillations of a sieve of 50 Hz and more dispersed by the sieve into very small bubbles. Due to this, flotation complexes of particles of hydrophobic mineral and air are formed over the screen surface of the screen, which are preserved mainly along the entire length of the screen due to the maintenance of the density of the pulp.

When approaching the screen surface directly associated with high-frequency electrovibrators, flotation complexes can pass through the sieve cells only if the particle sizes are substantially less than j than the dimensions of these cells. The effect of floatation is enhanced due to the pseudo-out of the desired layer, formed by oscillations of small parts of phosphate and rock near the sieve cells at a frequency of 50 Hz and more. At the same time, the rock particles together with the liquid phase intensively pass through the sieve surface. The phosphate separation limit is reduced, and the rocks are preserved, since the flotation complexes of the particles of the gangue are not formed.

Claims (1)

Invention Formula The method of enrichment of phosphate ores, which includes grinding the source material with water, feeding the crushed pulp to a vibrating sieve, withdrawal of separation products, characterized in that reagents are added to the pulp to increase the quality of the products, and the size of the sieve cells is added to the pulp. 0.5–1.0 mm is taken, and vibration is carried out at a frequency of 50–100 Hz.