Two-phase-flow well injection and brine extraction technology for alkali mixed liquor prepared through ammonia-alkali process

Abstract

The invention relates to the technical field of recycling of alkali mixed liquor prepared through an ammonia-alkali process, in particular to a two-phase-flow well injection and brine extraction technology for an alkali mixed liquor prepared through an ammonia-alkali process. The technical scheme includes that the technology includes firstly, subjecting the alkali mixed liquor prepared through theammonia-alkali process to sand separation, decreasing the temperature of the obtained alkali mixed liquor to 50 DEG C after cogeneration and flash cooling, delivering the obtained alkali mixed liquorfrom an alkali factory area to a storage bucket with a stirring device in a salt mine area for storage through a slurry pump and a steel-skeleton plastic composite pipe, delivering the obtained alkali mixed liquor to a Glauber's salt type salt mine well when the stirring device in the storage bucket is in operation, and carrying out sulfate ion and calcium ion reaction as well as natural settlingso as to obtain brine. The two-phase-flow well injection and brine extraction technology for the alkali mixed liquor prepared through the ammonia-alkali process is low in pollution and cost, therebycreating higher economic and environmental benefits.

Description

technical field [0001] The invention relates to the technical field of resource utilization of the ammonia-soda alkali-making mixed liquor, in particular to a two-phase flow injection well brine mining technology for the ammonia-soda alkali-making mixed liquor. Background technique [0002] The ammonia-soda method, also known as the Sulvey method, is a method for preparing soda ash invented by the Belgian engineer Sulvey, that is, using salt, sodium chloride, limestone (calcined to produce quicklime and carbon dioxide) and ammonia as raw materials. soda ash. The advantage of this process is that ammonia can be recycled and consumes little; the disadvantage is that the reaction is not complete, the utilization rate of sodium is low, and the utilization rate of table salt is generally 70-72%. Containing 10% calcium chloride, 5% sodium chloride, and 5% solid particles (mainly CaCO 3 , CaSO 4 , Mg(OH) 2 and trace SiO 2 ), because the direct discharge of ammonia-alkali alkal...

AI Technical Summary

Problems solved by technology

Though this method has also reached the purpose that the alkali-making mixed liquor is recycled, there are still many deficiencies: (1) the thenardite of the Glauber's salt type salt well is mainly in the middle part of the ore seam, and the Glauber's salt is mainly concentrated in the bottom and the upper part of the ore seam. During the upward injection process, the side wall of the salt well is easy to collapse and sink at the bottom of the salt cavity. If the well is injected in the form of slurry adjustment, a large part of the glauberite in the salt well will be buried at the bottom and cannot be effectively used. Affect the use volume of the salt mine solution cavity, and also affect the CaCl in the ammonia-soda alkali-making mixed solution 2 (2) The process route is long, not only the investment is large but also the operation is complicated, and the production cost is high: (3) The environment is polluted and the pressure on environmental protection is high: the soda slag obtained by sedimentation and separation must not only be stored in the yard of the soda plant, but also used Car transported to the salt mine area for storage again, resulting in a bad environment on the production site. At the same time, the alkali slag is easy to fall during the process of car transportation, which affects environmental sanitation and puts a lot of pressure on environmental protection.