CN1172073A

CN1172073A - Production technique for ultramicrofine light calcium carbonate

Info

Publication number: CN1172073A
Application number: CN 97107449
Authority: CN
Inventors: 王睛雁; 方元; 谢开雯
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-04-17
Filing date: 1997-04-17
Publication date: 1998-02-04

Abstract

The present invention discloses a production process of ultramicrofine light calcium carbonate. Said process includes the following steps: extracting carbide dregs or hydrated lime in compound containing chlorine, discharging NH3, filtering to remove residue, adding ammonium hydrogen carbonate, precipitating and filtering so as to obtain the ultramicrofine light calcium carbonate. The filtrate can be returned to extracting proceduce, and can be circularly used. As compared with existent technology, said invention possesses the advantages of controllable concentration and no heating procedure in the course of production, low cost and simple process. By adding related adjuvant it can obtain globular or flaky crystalline calcium carbonate.

Description

Production process of superfine light calcium carbonate

The invention relates to a production process of calcium carbonate.

At present, light calcium carbonate is generally produced by a carbonization method (synthesis method), namely Ca (OH) is used in the production₂Milk and CO₂By carbonization to form CaCO₃Precipitation, the reaction being exothermicAccordingly, temperature rise occurs, ultrafine particles cannot be generated, the production process is not easy to control, the production cost is high, and carbide slag cannot be used as a production raw material for production.

The purpose of the invention is: provides a process for producing ultra-fine light calcium carbonate and light calcium carbonate by using carbide slag as a raw material.

The invention is realized by the following steps: leaching carbide slag or slaked lime in chloride-containing solution, discharging NH₃Then filtering again to remove residue, adding ammonium bicarbonate, precipitating, filtering to obtain superfine light calcium carbonate, and returning the filtrate to the leaching process for recycling, wherein the reaction equation is as follows:

。

or leaching carbide slag or slaked lime in chloride-containing solution, filtering to remove residue, and adding CO₂The precipitated and filtered light calcium carbonate can be obtained, the filtrate can be returned to the leaching process for recycling, and the reaction equation is as follows:

。

compared with the prior art, the method has the advantages of controllable concentration, no temperature rise, capability of producing by using the calcium carbide waste residue as a raw material and the like in the process, can produce ultrafine light calcium carbonate products, and can recycle the filtrate, so the production cost is low, the process is simple, and the problem of three wastes is solved; spherical and flaky crystalline calcium carbonate can be prepared by adding related auxiliary agents.

FIG. 1 is a flow chart of the production process of the present invention.

The embodiment of the invention comprises the following steps: leaching carbide slag or slaked lime in ammonium chloride solution, discharging NH₃Filtering to remove slag, adding ammonium bicarbonate, precipitating, filtering to obtain superfine light calcium carbonate, and returning the filtrate to the leaching process for recycling, wherein the reaction equation is as follows:

；

or leaching carbide slag or slaked lime in ammonium chloride-containing solution, filtering to remove residue, and adding CO₂The precipitated and filtered light calcium carbonate can be obtained, the filtrate can be returned to the leaching process for recycling, and the reaction equation is as follows:

；

and finally, drying and packaging the obtained product to obtain a finished product.

Claims

1. A production process of ultra-fine light calcium carbonate is characterized in that: leaching carbide slag or slaked lime in chloride-containing solution, discharging NH₃Then filtering to remove liquid, adding ammonium bicarbonate, precipitating, filtering to obtain superfine light calcium carbonate, returning the filtrate to the leaching process for recycling, wherein the reaction equation is as follows:

。

2. a production process of light calcium carbonate is characterized in that: leaching carbide slag or slaked lime in chloride, filtering to remove slag, and adding carbon dioxide as raw material to obtain light calcium carbonate, wherein the reaction formula is as follows:

。