Process for preparing purely-natural nano supermicro calcium powder

A preparation process, nano-scale technology, applied in the direction of calcium/strontium/barium oxide/hydroxide, etc., can solve the problems of cumbersome operation steps, cumbersome calcination operation, high calcination temperature, etc., achieve low calcination temperature, reduce calcination temperature, The effect of improving purity

Inactive Publication Date: 2017-02-15
QINGDAO SHIAN BIOLOGICAL ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the calcination time of this patent is shortened to several hours, the calcination process includes two steps of calcination in a non-oxygen environment and calcination in an oxygen environment, and the operation steps are cumbersome.
Invention patent: Application No. 201410140698.7 discloses a preparation process of pure natural ultrafine calcium powder, which overcomes the defects of long calcination time and cumbersome calcination operation of the above two patents. The step of temperature programming includes: (a) initially raising the temperature to 350-1600°C, calcining for 1.5-3 hours, until the raw material is heated to form cracks; (b) continuing to heat up to 1000-2000°C, calcining for 1-3.5 hours, until carbonic acid Calcium is completely broken down
Although this preparation process takes a short time and the operation is relatively simple, the calcination temperature is still high and the energy consumption is large.

Method used

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  • Process for preparing purely-natural nano supermicro calcium powder
  • Process for preparing purely-natural nano supermicro calcium powder
  • Process for preparing purely-natural nano supermicro calcium powder

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Embodiment 1

[0035] A preparation process of pure natural nano-scale ultrafine calcium powder, including: material selection, cleaning, crushing, grinding, calcining, regrinding, hydrolysis, ultrafine grinding, and drying;

[0036] Material selection: Tridacna shells are used as raw materials;

[0037] Cleaning: including water washing, ultrasonic pickling and high-pressure water washing, water washing removes sludge on the surface of raw materials, ultrasonic pickling removes skin, difficult-to-wash stains and heavy metals of raw materials, the specific operation of ultrasonic pickling is: put giant clams at a concentration of 0.01 Ultrasonic pickling in mol / L dilute HCl solution for 30 minutes, ultrasonic frequency is 20KHz; high-pressure water washing removes the products of ultrasonic pickling, and sprays the raw materials with a nozzle with a pressure of 60 psi and a flow rate of 4 gallons per minute, and the spray time is 8 minutes ;

[0038] Crush: Crush the cleaned raw materials t...

Embodiment 2

[0047] A preparation process of pure natural nano-scale ultrafine calcium powder, including: material selection, cleaning, crushing, grinding, calcining, regrinding, hydrolysis, ultrafine grinding, and drying;

[0048] Material selection: pearls are used as raw materials;

[0049] Cleaning: including water washing, ultrasonic pickling and high-pressure water washing, water washing removes sludge on the surface of raw materials, ultrasonic pickling removes the skin, difficult-to-wash stains and heavy metals of raw materials, the specific operation of ultrasonic pickling is: put giant clams at a concentration of 0.02 Ultrasonic pickling in mol / L dilute HCl solution for 40 minutes, ultrasonic frequency is 30KHz; high-pressure water washing removes the products of ultrasonic pickling, and sprays the raw materials with a nozzle with a pressure of 70 psi and a flow rate of 5 gallons per minute, and the spraying time is 10 minutes ;

[0050] Crush: Crush the cleaned raw materials to a...

Embodiment 3

[0059] A preparation process of pure natural nano-scale ultrafine calcium powder, including: material selection, cleaning, crushing, grinding, calcining, regrinding, hydrolysis, ultrafine grinding, and drying;

[0060] Material selection: oyster shells are used as raw materials;

[0061] Cleaning: including water washing, ultrasonic pickling and high-pressure water washing, water washing removes sludge on the surface of raw materials, ultrasonic pickling removes skin, difficult-to-wash stains and heavy metals of raw materials, the specific operation of ultrasonic pickling is: put giant clams at a concentration of 0.03 Ultrasonic acid pickling in mol / L dilute HCl solution for 50 minutes, the ultrasonic frequency is 40KHz; high-pressure water washing removes the products of ultrasonic pickling, and the raw materials are sprayed with a nozzle with a pressure of 80 psi and a flow rate of 3 gallons per minute, and the spray time is 10 minutes ;

[0062] Crush: Crush the cleaned ra...

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Abstract

The present invention discloses a process for preparing purely-natural nano supermicro calcium powder, and the process comprises selecting raw materials, washing, crushing, grinding, calcining, grinding again, hydrolyzing, superfinely grinding and drying; the washing includes water washing, ultrasonic acid pickling and high-pressure water washing, the ultrasonic acid pickling is as follows: ultrasonic acid pickling the raw materials in a dilute HCl solution with the concentration of 0.01-0.05mol / L for 30-60min, wherein the ultrasonic frequency is 20-60KHz; the calcining is as follows: using a temperature programming manner for heating and calcining the ground raw materials, the temperature programming comprises the following steps: (a) initially heating to 500-800 DEG C at the heating rate of 20-30 DEG C / min and holding for 2-4H, and (b) continuing heating to 1000-1200 DEG C at the heating rate of 5-10 DEG C / min and holding for 3-5H. The process for preparing the purely-natural nano supermicro calcium powder is low in temperature, calcining energy consumption is low, energy is saved, and the purity of the nano supermicro calcium powder is improved.

Description

technical field [0001] The invention relates to the technical field of calcium powder preparation, in particular to a preparation process of pure natural nanoscale ultrafine calcium powder. Background technique [0002] Calcium powder, especially the composite calcium powder of calcium hydroxide, calcium carbonate and calcium oxide, has the functions of anti-mildew, sterilization, anti-oxidation preservation, deodorization, antibacterial, sterilization and decomposition of harmful chemical substances. Composite calcium powder, especially pure natural composite calcium powder, is mostly produced by calcining raw materials such as limestone or shells in an oxygen-containing environment at a certain high temperature for a long time. [0003] US patent: US7662416B2 discloses a preparation process of acid neutralizer, the preparation process described in this patent includes material selection, cleaning to remove heavy metals, grinding to a particle size of 100μm-20mm, and calcin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/06
CPCC01F11/06C01P2004/03C01P2004/62C01P2006/80
Inventor 吴敬华
Owner QINGDAO SHIAN BIOLOGICAL ENG
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