Comprehensive Evaluation And Development Direction Of Calcium Carbonate Powder

2021-08-23

Summary:As an important inorganic chemical product, calcium carbonate is widely used in the production and processing of rubber, plastic, paper making, coating, paint,

As an important inorganic chemical product, calcium carbonate is widely used in the production and processing of rubber, plastic, paper making, coating, paint, building materials, ink, food and medicine, daily use, chemical industry, textile, feed and other industries.Different industries have different control indexes for the quality of calcium carbonate products.

A Variety Of Product Specifications

Many varieties of calcium carbonate: quartz sand, light calcium, heavy calcium, ultrafine calcium, active calcium.Active calcium is divided into calcium carbonate treated by coupling agent, and the commonly used calcium coupling agents are: phosphate ester, aluminate, titanate, borate, silane, phthalic acid and other coupling agents.Activator treatment of calcium carbonate, currently commonly used activators are: stearic acid, linoleic acid, rosin acid, lignosulfonate and so on.

At present, with different crushing processing equipment, can produce: 400 mesh, 500 mesh, 600 mesh, 800 mesh, 1000 mesh, 1250 mesh, 2500 mesh, 5000 mesh of various particle size of heavy calcium carbonate, and because of the special needs of paper, paint, pigment can also be ground to produce 2µm of heavy calcium.

Due to the difference of 2µm heavy calcium content, it is divided into the following specifications:

Ultrafine calcium carbonate: refers to the primary particle size between 0.02-0.1μm of calcium carbonate.

Active calcium: Active calcium is usually the Marine life oyster shell as raw material, through the scientific process of highly efficient food nutrition additives.It has high activity in vivo, fast absorption and utilization, safety, no side effects, and is internationally known as A,A calcium, that is, active calcium easily absorbed.

Product Related Technical Indicators And Test Methods

1. Technical Indicators

As an important inorganic chemical product, calcium carbonate is widely used in the production and processing of rubber, plastic, paper making, coating, paint, building materials, ink, food and medicine, daily use, chemical industry, textile, feed and other industries.Different industries have different control indexes for the quality of calcium carbonate products.These quality control indicators can be generally divided into two categories, one is chemical indicators, the other is physical indicators.As far as the chemical index is concerned, it mainly refers to its purity, such as whether it contains impurities such as iron and manganese, which is relatively easy to achieve. As long as the qualified grade of limestone ore is selected, the range of value fluctuation in the product will not be very large.Physical indicators (such as product morphology, particle size range, settlement specific volume, specific surface area) are not.The main reason is the product preparation process, product crystallization particle size, particle size distribution, crystal morphology and other differences.The specific volume of deposition of calcium carbonate is an important objective function of carbonization process and also an important index of the quality of calcium carbonate products.

2. Test Method

2.1 Setting Of Quality And Technical Indicators:

In the paper industry application, according to the requirements of the paper industry, cancel HG/T 3249 -- 2001 "industrial heavy calcium carbonate" standard in the pH value, volatile at 105℃, iron content, manganese content, activation degree sieve residue, copper seven and other indicators;In HG/T 3249.1-2008 "Heavy Calcium carbonate for paper industry" standard, added specific surface area, dark foreign body, fineness, wear rate, lead, hexavalent chromium, mercury, arsenic, cadmium nine indicators.

In the coating industry application, according to the requirements of the coating industry, cancel HG/T 3249 -- 2001 "industrial heavy Calcium carbonate" standard pH value, hydrochloric acid insoluble matter, 105℃ volatile matter, iron content, manganese content, sieve residue, copper seven indicators;In HG/T 3249.2 -- 2008 "Heavy Calcium Carbonate for Coating Industry" standard, added fineness, specific surface area, lead, hexavalent chromium, mercury, arsenic, cadmium and other indicators.

In the plastic industry application, according to the requirements of the plastic industry, cancel HG/T 3249 -- 2001 "industrial heavy Calcium carbonate" standard pH value, hydrochloric acid insoluble matter, iron content, manganese content, sieve residue, copper six indicators;In HG/T 3249.3 -- 2008 "Heavy Calcium carbonate for Plastics Industry" standard, added fineness, specific surface area, lead, hexavalent chromium, mercury, arsenic, cadmium and other indicators.

In rubber industry application, according to the requirements of rubber industry, cancel HG/T 3249 -- 2001 "industrial heavy Calcium carbonate" standard pH value, iron content, manganese content, screen residue, copper five indicators;In HG/T 3249.4 -- 2008 "Heavy Calcium carbonate for rubber Industry" standard, added fineness, specific surface area, lead, hexavalent chromium, mercury, arsenic, cadmium and other indicators.

2.2 In Terms Of Inspection Techniques And Methods:

HG/T 3249.1 ~ 3249.4 -- 2008 "Heavy Calcium Carbonate for Industrial use" standard has improved the corresponding test methods of the added indexes.At the same time, the laser particle size tester, specific surface area tester, atomic absorption meter and other advanced testing instruments are introduced.Especially in the process of standard research, the introduction of the most advanced international malvern company laser particle size analyzer.The instrument is the only one known to be able to accurately measure particle sizes using the full michelian theory.

Comprehensive Evaluation And Development Direction Analysis

1. Comprehensive Evaluation

At present, the domestic calcium carbonate industry is developing from decentralized small-scale to centralized large-scale high-tech direction. The calcium carbonate industry belongs to the characteristics of strong resource and high growth of related industries.Domestic scientific research institutions and universities are actively exploring and researching related application technologies in powder research. The main directions are as follows: A, to nano calcium carbonate direction: nano calcium carbonate is the qualitative conversion of calcium carbonate function from general filling material to functional material.B, to the direction of ultra-fine calcium and sub-nanometer calcium development: the application range of ultra-fine calcium and sub-nanometer calcium is expanding, it can not only play a filling role but also partially improve the strength and other properties of products.At present, ink, high-grade paint (such as automotive paint, etc.) the main use of such products.C. Improvement of surface treatment technology and materials: The proportion of calcium carbonate in products can be increased after surface treatment. At present, surface modification materials develop rapidly, especially the development of coupling agent has been targeted for the use of different products.Using popularize plastic door window is a of the country such as Germany, United States, Japan "energy-saving state policy", in Germany, share of market of plastic door window exceeds 60%, United States exceeds 50%, and Chinese year sales already exceeded 1 million tons, but market share is less than 30%, have huge market development space.

The consumption of ultra-fine calcium carbonate in developed countries such as Europe and America accounts for half of all light calcium products, and the specialization rate is very high.At present, the plastic processing volume in China is 12000kt/a, and the calcium carbonate needs more than 1300kt/a.China's paper demand reaches 45000kt/a.China's Zhenjiang, Changshu, Jiangyin, Zhejiang, Ningbo and Tianjin are building hundreds of thousands of tons of paper mills, the total demand of calcium carbonate will reach 3000KT /a, paint, rubber and other industries calcium carbonate demand is also large, its potential market is bigger.According to the current market demand and forecast, the demand of ultra-fine calcium carbonate is about 500KT /a in the near future, and the usage is increasing by 20% annually, which has a broad market prospect.

2. Future Development

From the point of view of production products, the market prospect is broad.First, a wide range of applications.According to different grades and different uses, calcium carbonate is divided into more than 30 varieties, widely used in plastic, plastic steel, rubber, cable, paper making, medicine, food, paint, chemical industry and other 10 fields.At the same time, with the promotion of green environmental protection concept and the continuous maturity of nanotechnology, the market space of calcium carbonate industry will be further expanded.Second, the consumption demand is large.According to relevant data, China's annual production of all kinds of calcium carbonate more than 10 million tons, including 6 million tons of light calcium, production and consumption only second to the United States, ranking the second in the world.In the past two years, the amount of calcium carbonate in China has increased by 25%, high and middle grade products are in short supply, and a large number of imports are needed.Third, the product is versatile.On the one hand, adding calcium carbonate can improve the properties of products.Light calcium carbonate products can change the processing properties and mechanical properties of products, increase the surface smoothness and flexure resistance;On the other hand, increase the calcium carbonate filling amount.Can significantly reduce the cost of products.In recent years, as the cost of plastic and rubber products has increased significantly, increasing the filling amount of light calcium can reduce the cost and improve the benefit.

From the perspective of industrial development, the industry has great potential.Develop calcium carbonate industry, it is conduce to resource transform appreciation.After primary processing, the raw material is transformed into calcium carbonate, and the product value is increased from 40 yuan/ton to 500 yuan/ton. The resource advantage can be quickly transformed into economic benefits.Second, it is conducive to play the role of radiation driving.SBM introduced development of calcium carbonate as raw material of plastic, rubber, paint and other downstream industry has the advantageous conditions, especially pieces, plastic, the sole can plastic products, such as light calcium content above 15%, and can greatly reduce the production cost, improve the economic benefit, is very attractive to attract relevant supporting enterprises settled in.In addition, with the rapid development of light calcium leading products and supporting products such as plastics, it can also drive the synchronous development of mining, transportation and catering industry.

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