SU891558A1 - Method of phosphorus extraction from slime - Google Patents

Description

(54) METHOD FOR EXTRACTING PHOSPHORUS FROM SLIM

one

This invention relates to a process for the processing of phosphorus ishams formed during the electrothermal production of phosphorus.

There is a known method for the separation of phosphorus from sludge by treating it with hydrogen peroxide, which is supplied as a material, providing a weight ratio of phosphorus to peroxide of 1: 4. The process is conducted at 100-150 ° C for 30 minutes.

The closest to the proposed technical essence and the achieved result is a method for extracting phosphorus from sludge by treating it with organochlorine reagent and hydrogen peroxide at their weight ratio with phosphorus equal to (8-10): (0.02-0.05) :. The process is carried out at 55-65 ° C.

The disadvantage of this method is the low degree of phosphorus recovery, not exceeding 85%.

The purpose of the invention is to increase the recovery rate.

The goal is achieved by the fact that according to the method of extracting phosphorus from sludge by treating it with organochlorine reagent and oxidizing agent, as an oxidizing agent

air is supplied to the treatment in an amount that provides the ratio of organochlorine reagent, air and phosphorus contained in the sludge equal to (3-5): (0.15-0.25) :.

A decrease in the consumption of organochlorine compound leads to a decrease in the yield of pure phosphorus, and an increase does not affect its output anymore, a decrease in air consumption leads to insufficient phosphorus production from the sludge, and an increase to the oxidation of already released phosphorus.

An example. 130 g of sludge containing 40.86% of phosphorus and 260 g of trichlorethylene or carbon tetrachloride are placed in a thermostatic bath at 60 ° C with a mixer. 10 l of air at a speed of 15 l / h are bubbled through with vigorous stirring. The weight ratio of air to phosphorus is 0.25 :. After the specified amount of air has been mixed

25 is stopped and the mixture is allowed to stand until complete separation of the phases. The lower phase (phosphorus) is drained and weighed. The degree of phosphorus extraction during sludge treatment with trichlorethylene or carbon tetrachloride and air is 98 and 97.7%, respectively. Data on the effect of the amount of organochlorine on the degree of phosphorus recovery are presented in Table 1. Example 2. 130 g of sludge containing 10.1% of phosphorus and 66 g of trichlorethylene or carbon tetrachloride are placed in a thermostated at a reactor equipped with a stirrer. The weight ratio of the chloroanthanum to phosphorus is 5: 1. With vigorous stirring, 2.5 l of air is bubbled through the mixture at a rate of 15 l / h. After the end of the air inlet, the mixture is allowed to stand up to complete separation of the phases, then the ratio of organochlorine compound to phosphorus, weight. %

triple ethylene and air

90.2 94.5 97.1 98.0 97.0 The ratio of air to phosphorus, weight. %

trichlorethylene and air

91.2 95.0 95.3 98.0 93.4

Table 1

carbon tetrachloride and air

87.2 93.8 95.5 97.7 97.7

Table 2 Degree

carbon tetrachloride and air

Claims (2)

93.0 93.9 95.3 93.7 90.7 phosphorus slippy and weighed. The degree of extraction of phosphorus in the treatment of sludge with trichlorethylene or carbon tetrachloride in the presence of air is respectively 98 and 97.7%. The dependence of the degree of phosphorus recovery on the weight ratio of air to phosphorus is presented in Table. 2. Thus, the proposed method of extracting phosphorus from sludge in comparison with the known method will increase the degree of extraction of phosphorus by 13-14% and reduce the cost of the process by replacing expensive hydrogen peroxide and halving the consumption of organochlorine reagent. Phosphorus recovery rate, when phosphorus extraction sludge is processed during sludge processing,% Claims of the invention Phosphorus recovery method from the sludge by treating it with organochlorine reagent and oxidizing agent when heated, characterized in that, in order to increase the recovery rate, air is used as an oxidizer in an amount to ensure the ratio of organochlorine reagent, air and phosphorus contained in the sludge (3-5): (0.15-0.25) :.