Process for extracting non-mineral nano calcium carbonate from water

Abstract

The invention discloses a process for extracting non-mineral nano calcium carbonate from water, which comprises the following steps: pretreating high-hardness salt-containing wastewater, filtering, cooling, introducing into a first-stage calcium precipitation tank, and carrying out extracorporeal circulation on the liquid in the first-stage calcium precipitation tank; in the first-stage calcium precipitation process, adding Na2CO3 into an inlet of a centrifugal pump a, scattering generated materials through an impeller of the centrifugal pump a and then subjecting the materials to secondary mixing and scattering through an ejector a installed at an outlet of the pump, and forming nano calcium carbonate precipitate through reaction; in the second-stage calcium precipitation process, adding Na2CO3 into an inlet of a centrifugal pump b, subjecting generated materials to scattering through an impeller of the centrifugal pump b and then to secondary mixing and scattering through an ejector b installed at an outlet of the pump, and forming nano calcium carbonate precipitates through a reaction; the process is unitized, the product purity is high, high-salt and high-hardness wastewater is used as a raw material, ore resources are not consumed, on one hand, the water treatment operation cost is reduced, on the other hand, ore extraction resources are saved, the cost of nano calcium carbonate is effectively reduced, and the market demand of nano calcium carbonate is made up.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a process for extracting non-mineral nano-calcium carbonate from water. Background technique [0002] Nano-calcium carbonate is widely used in rubber, plastics, paint, paper, ink and other industries, and is a good additive. With the development of society in recent years, the market demand for nano-calcium carbonate is constantly increasing. It is mainly divided into light calcium and heavy calcium. Heavy calcium is generally produced directly from ore, which requires high purity of ore and limited quantity. Especially under the increasingly stringent mining requirements, the output of heavy calcium is limited; light calcium is generally produced by chemical methods. Purification by chemical method does not have high requirements for ore, but a large amount of waste liquid and residue are produced in the production process, which consumes a large amount of o...

AI Technical Summary

Problems solved by technology

It is mainly divided into light calcium and heavy calcium. Heavy calcium is generally produced directly from ore, which requires high purity of ore and limited quantity. Especially under the increasingly stringent mining requirements, the output of heavy calcium is limited; light calcium is generally produced by chemical methods. Purification by chemical method does not have high requirements for ore, but a large amount of waste liquid and residue are produced in the production process. While consuming a large amount of ore resources, there are certain environmental protection problems

[0003] In the process of water treatment, a large amount of high-salt and high-hard wastewater is produced, which is a good raw material for the production of nano-calcium carbonate. However, the wastewater is traditionally treated by coagulation and sedimentation technology, which produces a large amount of waste residue, which is generally treated as solid waste by landfill. Disposal takes up a large amount of land resources, landfill maintenance costs are high, and there is a certain amount of environmental pollution, which increases the operating costs of the enterprise and also increases the difficulty of maintenance. The high-pressure environmental protection policy has always troubled the enterprise

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