Process using grinding-aid-free wet grinding and slurry grading to prepare superfine ground calcium carbonate

A technology of heavy calcium carbonate and slurry, applied in calcium carbonate/strontium/barium, inorganic chemistry, calcium/strontium/barium compounds, etc., can solve problems such as narrow particle size distribution, simplify process, reduce cost, and improve application safe effect

Active Publication Date: 2018-04-13
广西河池华泰新材料科技有限公司
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] One of the objectives of the present invention is to provide a process for preparing ultra-fine ground calcium carbonate by wet grinding without grinding aids and grading slurry without adding any grinding aids, and the slurry can be directly classified , to ensure that the product is not polluted during the production and processing process, and provide a safety guarantee for downstream products; and the separated coarse particles are circularly ground to realize the slurry classification process, which makes up for the problem that the domestic wet grinding slurry cannot be classified, and makes the product Narrow particle size distribution, more uniform product fineness

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Process using grinding-aid-free wet grinding and slurry grading to prepare superfine ground calcium carbonate
  • Process using grinding-aid-free wet grinding and slurry grading to prepare superfine ground calcium carbonate
  • Process using grinding-aid-free wet grinding and slurry grading to prepare superfine ground calcium carbonate

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0037] The production system adopted in the preparation process of the present invention includes a raw material tank 1, a batching tank 2, a wet mill 3, a cyclone 4, a finished product slurry tank 5, a centrifuge 6, a dryer 7, a finished product tank 8, Packing Machine. The cyclone 4 is a hydrocyclone; the hydrocyclone includes an overflow port and an underflow port. A wet mill buffer tank 10 is arranged between the batching tank 2 and the wet mill 3 ; a cyclone feed tank 11 is arranged between the wet mill 3 and the cyclone 4 .

[0038] As an improvement, a wet grinder buffer tank 10 is also arranged between the batching tank 2 and the wet grinder 3, and the outlet of the batching tank 2 is connected to the wet grinder buffer tank 10, and the wet grinder buffer tank 10 It is connected with the feeding port of the wet mill 3 . The slurry in the batching tank 2 is delivered to the buffer tank 10 of the wet mill through the batching tank discharge pump. The slurry pump and t...

Embodiment 1

[0041] A process for preparing superfine ground calcium carbonate by wet grinding without grinding aids and grading slurry, comprising the following steps:

[0042] S1. Slurry preparation: Calcite (calcium carbonate (dry basis) 99.33%; hydrochloric acid insolubles 0.024%; reducing sulfur ≤ 5mg / kg; sulfide-free; Fe 0.002%; Fe 46mg / kg; As3mg / kg; heavy metal (0.001% in terms of lead)) is crushed by a crusher and pulverized into coarse powder by a grinder, and stored in the raw material tank 1 for subsequent use. The decomposed stone coarse powder is transported in the batching tank 2 by screw conveyor then, and adds water and prepares slurry, and the slurry solid content of configuration is 35%. Finally, the slurry is quantitatively delivered to the wet mill 3 through a horizontal centrifugal slurry pump and a flow meter for grinding; the wet mill feeds 2 tons, and the power per ton is 60KW. Slurry particle size after grinding 2um 41%, D 50 =2.70,D 97 =10.6, +25um>30ppm.

[004...

Embodiment 2

[0049] A process for preparing superfine ground calcium carbonate by wet grinding without grinding aids and grading slurry, comprising the following steps:

[0050] S1. Slurry preparation: Calcite (calcium carbonate (dry basis) 99.33%; hydrochloric acid insolubles 0.024%; reducing sulfur ≤ 5mg / kg; sulfide-free; Fe 0.002%; Fe 46mg / kg; As3mg / kg; heavy metal (0.001% in terms of lead)) is crushed by a crusher and pulverized into coarse powder by a grinder, and stored in the raw material tank 1 for subsequent use. The decomposed stone coarse powder is transported in the batching tank 2 by screw conveyor then, and adds water and prepares slurry, and the slurry solid content of configuration is 32%. Finally, the slurry is quantitatively delivered to the wet mill 3 by a horizontal centrifugal slurry pump and a flow meter for grinding; the wet mill feeds 1.6 tons, the ton power is 85KW, and the flow rate of the grinder for grinding is 110L / min. Slurry particle size after grinding 2um ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention provides a process using grinding-aid-free wet grinding and slurry grading to prepare superfine ground calcium carbonate and relates to the field of calcium carbonate production. The process specifically includes: preparing slurry, grading the slurry, dewatering, and drying. The process has the advantages that grinding aid adding is not needed, product pollution during product production is avoided, and a safety guarantee is provided for downstream products; separated coarse particles are ground in a circulating manner, slurry grading is achieved, the problem that domestic wet grinding slurry cannot be graded is solved, narrow product particle size distribution is achieved, and uniform product fineness is achieved.

Description

technical field [0001] The invention relates to the field of calcium carbonate production, in particular to a process for preparing superfine heavy calcium carbonate by wet grinding without grinding aids and grading slurry. Background technique [0002] Calcium carbonate is usually divided into heavy calcium carbonate and light calcium carbonate. Heavy calcium carbonate, also known as ground calcium carbonate, referred to as heavy calcium, is obtained by physical processing methods; light calcium carbonate, also known as precipitated calcium carbonate, referred to as light calcium, is obtained by chemical processing methods. Heavy calcium carbonate is a calcium carbonate product obtained by physical methods. It is generally ground with high-purity limestone (such as calcite, chalk, etc.). The density of heavy calcium carbonate is heavier than that of light calcium carbonate, and the sedimentation volume is larger. Low. [0003] Due to its many advantages, heavy calcium car...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): C01F11/18
CPCC01F11/185C01P2004/51C01P2004/61C01P2004/62
Inventor 陶勇
Owner 广西河池华泰新材料科技有限公司
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap