SU791654A1 - Method of suspension thickening - Google Patents

Description

one

The invention relates to a technological process m chemical, microbial, food, construction-. and other industries, and more specifically to the processes of thickening and dehydrating suspensions and cleaning waste liquids containing fine impurities.

The technical method for the invention is most closely related to the method of using protein drocchi as flocculant 1. The application of the known method is based on the addition of protein yeast to the condensed suspension with stirring. The method of preparation of protein yeast as flocculation involves mixing them with caustic soda solution.

The resulting 5% solution of flocculant with constant stirring 20 is kept for 1 h at 90 ° C and then diluted with hot water so as to obtain working solutions of flocculon with different concentrations from 1 to 5. The resulting 25 yP by this method flocculated were added to the suspension at the rate of 10100 g yeast per 1 m pulp.

However, the use of protein yeast as a flocculant to thicken 30

suspensions are ineffective, since yeasts are usually present in a liquid medium as vidalgomerates, whose dimensions exceed the size of individual cells by a factor of 1000 or more.

The deposition rate is 9 m / h. The purity of the discharge is 82 mg / l.

The decrease in the specific surface area of ba.pkovy yeasts due to their presence in the form of algorithmic cells sharply reduces the effectiveness of this flocculant.

The purpose of the invention is to increase the rate of sedimentation and the purity of the drain and reduce the consumption of flocculant.

This is achieved by the fact that before adding to the suspension, protein yeast is crushed to individual cells and segments. The grinding of protein yeast is carried out in the presence of surfactants in the fluidized bed.

The technology of the proposed method is as follows.

Claims (1)

A suspension of yeast cells with a concentration of 0.5-2.0% enters an apparatus, such as a mixer-grinder, a construction homogenizer. Kalininskog: about the Polytechnic Institute, in which the destruction of the nuclei of algo-mers and individual cells of protein yeast occurs. Grinding in a mixture, a tele-grinder-homogenizer takes place in the presence of surface-active substances, for example sulforide, in the fluidized bed using various gases, in particular inert gases, as the additive agent. I Prepared according to this technology 4 (rye is added to the split ecu suspension when added. When yeast is crushed into the suspension, the intensity of mixing is important, which is estimated by the gr.a-dient speed. In the case of crushed pine as a flow rate the gradient should not exceed 500, otherwise the intensive destruction of the floccules formed will begin. During the grinding of the Bovine yeast, the temperature, the pH and the time interval after the destruction of the yeast X cells and adding them to the suspension 13. Experimental studies have found that the grinding temperature should not exceed 54 Cf, the pH values should be within 3-8, and the time interval after the destruction of yeast cells and their addition to the suspension should be 1-60 minutes The concentration of the crushed powdered additized from the solids content in the condensable suspension is 1–50 g per 1 m of the suspension Example: Protein yeast is added to a finely dispersed aqueous suspension of phosphorite with a solid content of 5.5%. The yeast consumption is 30 mg per 1 liter of 5% concentration phosphate suspension. Before mixing with phosphate, an aqueous solution of flocculant (protein yeast) is passed through an SIG (mixer-grinder-homogenizer) apparatus, in which the yeast agglomerates are destroyed to individual cell sizes or cell segments. The grinding of yeast agglomerates is carried out at the following parameters: temperature, pH 8. When grinding the yeast, Lysforeid is added to intensify the destruction of the cells: at a rate of 0.3% by weight QT of the amount of the ground yeast. After 2 minutes after the end of grinding, a solution of flocculant (protein extracts) is added to the suspension of phosphate in the indicated norms. After stirring the suspension of phosphate with the flocculant solution, rapid precipitation of the solid phase is observed. The sedimentation rate is 24 m / h and the purity of the drain (clarified liquid) is 16 mg / l. In the case of pre-machining, the specific surface area of flocculant protein yeast} increases and, in addition, the effect of intracellular substances, which also possess the properties of Lokoultom in coagulants, is manifested. In order to achieve the same thickening effect in the case of the use of yeast with preliminary grinding, flocculation requires 3-5 times less than without preliminary grinding. The technical and economic effect of the proposed method consists in reducing yeast consumption by a factor of 3-5 compared with using them in the form of yeast algomerats, as well as increasing the effectiveness of the suspension thickening process, which consists in reducing the loss of the solid phase with clarified liquid. Formula of the invention the introduction of protein yeast under agitation, characterized in that, in order to increase the sedimentation rate and the purity of the drain and reduce the flocculant flow rate v, the protein yeast has been preliminarily ground chayut to separate cells and cell segments in the presence of surfactants in psevdorzhizhennom layer. , Sources of information taken into account during the examination 1. Journal of Non-Ferrous Metals, 1957, 12, p. ten.