SU1690846A1 - Method of selective flocculating of coal slime - Google Patents

Abstract

The invention relates to methods for the selective flocculation of coal slimes, and used in coal and coke industry. The goal is to improve the quality of flocculation products. Butadiene styrene latex floc nt is mixed with purified phenolic waste water from coke production in a ratio of 1: 7-1: 12. The resulting mixture is stirred for 60-180 s. Inject the mixture into the slurry slurry and condition. Thereafter, the mixture is separated by gravity. 4 tab.

Description

The invention relates to methods for the selective flocculation of coal slimes and can be used in the coal and coke industry.

The aim of the invention is to improve the quality of flocculation products.

The method is as follows.

The coal slurry pulp is conditioned with a styrene-butadiene flocculant, which, before being introduced into the pulp, is mixed with purified phenolic water from a coke-chemical production in a ratio of 1: 7-1: 12, and is stirred for 60-180 s.

Improving the quality of the concentrate is achieved due to a more selective effect in relation to the coal surface of the used mixture of flocculation and phenolic water, which ensures a more efficient separation of the system,

however, most of the mineral particles are discarded.

This becomes possible as a result of enhancing the effect of latex flocculation due to a change in the conformation of its macromolecules, a more selective fixation of the complex of butadiene and styrene on the surface of coal particles, which leads to a better separation from mineral sludge and, consequently, to an increase in the selectivity factor

The reagents used in the proposed method for selective flocation have the following characteristics.

Selective latex flocculant of BS-30 F brand (TU 38.103600-86) is a copolymer of butadiene - 1,3 (divinyl) CH2 CH-CH CH2, mol.m. 54.09 (OST 38-3-71) and styrene (vinylbenzplé) - CeHg-, mol.m. 104.14 (GOST 10003-76)

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As an emulsifier, potassium soap of disproportionate cannofols (TU 38,103261-75), the acid number of mg KOH per 1 not less than 162, and the synthetic fatty acids of the CicrCie fraction (OST 38.7-25-73 with changes in 1976) are used.

The composition of the purified phenolic waste water from the coke production is shown in Table 1.

The method is carried out as follows.

The initial product for the selective flocculus process was real sludge pulp (initial flotation). The pulp contained 80 kg / m3 solid product with ash content of 23.4%. Class less than 0.15 mm in the pulp contained about 68%. In a laboratory installation, a slug flocculant mixed with purified phenolic waste water from a coke-chemical plant, thoroughly mixed for 60–180 s, was added at a rate of 200 g / t lat in a 0.5 l slurry slurry. The pulp with the added mixture of flocculant and phenolic water was conditioned for 60 s with flocculant in a mixer with an impeller rotation frequency of 3,000 min. After conditioning, the umbilical was placed in a glass separating funnel and was separated by gravity (by settling under the force of gravity) of the sludge into concentrate and waste.

Example 1. Initially, experiments were carried out to substantiate the validity of the choice of the quality of an additive to selective floccule of phenolic water, as well as the range of variation of the ratio of elective flocculus and phenolic water.

The conditioning time of the mixture of flocculant and electrolyte in this example was 120 s,

The results are shown in Table. 2

The data show that the efficiency of the process of selective flocculation is maximum (the highest

coefficient of selectivity) in the case of mixing flocta nta BS-ZOF with phenolic water in the ratio of 1: 7-1: 12.

Use instead of phenolic, for example, drinking water, having the composition given in table. 3, does not provide an increase in the efficiency of the process of selective flocculation in comparison with the use of only flocculant BS-ZOF of 40% concentration (or containing 40% of the basic substance in accordance with TU 38.103600-86).

Example 2. Next, experiments were carried out to substantiate the validity of the choice of the range for varying the mixing time of flahul nta BS-ZOF and phenolic waste water. The ratio of flocta nta and phenolic water is equal to 1:10.

The experiments were carried out according to the method described above.

The results are shown in Table. four.

As follows from the data obtained, the mixing time of the initial components of the flocculating mixture (flocculant BS-FFP with phenolic wastewater) significantly affects the efficiency of the mixture interaction with the pulp. The highest coefficient of selectivity (0.995–0.996) is obtained in the case of mixing, for a current of L0–180 s.

Claims (1)

The invention of the method of selective flocculation of coal sludge. including conditioning the original pulp with butadiene styrene latex flocculant and gravitational separation of the obtained product into concentrate and walking vessels, characterized in that, in order to improve the quality of flocculation products, before conditioning the pulp S with flocculant, the latter is mixed with purified phenolic waste water of the coke chemical industry ratio from 1: 7-1: 12 for 60-180 seconds. Table 1 The composition of the purified phenolic waste water coke production Dependence of the coefficient of selectivity on the composition of the flocculating mixture Table 2 Dependence of the selectivity coefficient on the mixing time of the components of the flocculating mixture Table3 Table4