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Brief introduction to the comprehensive utilization and deep processing technology results of serpentine and asbestos tailings
1.1 Results Technical Features and Innovation
By acid leaching, washing by filtration, analysis of the control base of magnesium hydroxide and alkali-soluble acid leaching residue was filtered off and washed, acid silica precipitation process control method, a base and timely analysis and acid precipitation during the surface treatment or surface Modification to prepare ultrafine magnesium hydroxide and ultrafine high specific surface area silica. The main features and innovations are: 1 integrated chemical leaching and separation technology, powder surface treatment technology and product particle size and morphology control technology and other technical principles; 2 using oxidation and alkali precipitation to remove iron impurities in the leaching solution and recovering serpentine metallic Ni; precipitate of ferric hydroxide by using dilute alkali and washing of the filter cake to reduce the break up of magnesium hydroxide entrainment rate of iron hydroxide; â‘¢Mg (OH) 2 precipitation process by promptly The surface treatment controls the particle size of the precipitate, prevents the particles from forming hard agglomerates during aging and drying; 4 alkaline leaching or purification of the filter residue after leaching the magnesium salt to prepare highly dispersible ultrafine white carbon or porous two Silicon oxide functional material.
1.2 Main technical indicators
The output rate of the pilot products and comprehensive utilization products (based on processing 1000kg of raw ore ) and main technical indicators:
Scheme 1 (The main products are ultra-fine magnesium hydroxide and ultra-fine white carbon black, ultra-fine magnesium hydroxide can be produced by simple treatment to produce high-purity ultra-fine magnesium oxide):
(1) Output rate
Ultrafine Magnesium 3 450kg, ore Mg (OH) 2 recoveries of 85%; ultra-fine silica 3 300kg, ore recoveries of 80% SiO 2; iron-nickel mixture 120 ~ 150kg; magnesium aluminum silicate slag (available) about 100 kg.
(2) Main technical indicators
1 ultrafine magnesium hydroxide: median particle size (d 50 ) 1.0 ~ 3.0 m m, Mg (OH) 2 = 98 ± 0.5%, whiteness > 93.0;
2 ultrafine white carbon black: BET specific surface area of ​​150 ~ 450m 2 / g, pore volume of 0.47 ~ 1.01cm 3 / g, an average pore diameter of 30 ~ 80?, dry basis SiO 2 content of 3 99%, whiteness of 3 93.0;
3 iron-nickel mixture: Ni 3 1.3%; TFe 3 40.0%.
Scheme 2 (The main products are ultra-fine magnesium hydroxide and porous silica, ultra-fine magnesium hydroxide can be produced by simple treatment to produce high-purity ultra-fine magnesium oxide):
(1) Output rate
The recovery of Mg(OH) 2 in the ultrafine magnesium hydroxide 3 450kg ore is 3 85%; the porous silica 3 420kg, the recovery of SiO 2 in the ore is 3 99%; the mixture of iron and nickel is 120 ~ 150kg.
(2) Main technical indicators
1 ultrafine magnesium hydroxide: median particle size (d 50 ) 1.0 ~ 3.0 m m, Mg (OH) 2 = 98 ± 0.5%, whiteness > 93.0;
2 Porous silica: BET specific surface area 3 300 m 2 /g; SiO 2 content 3 85%; the internal pores of the particles are developed, and the pore size distribution range is mainly concentrated at 0.45-2 nm.
3 iron-nickel mixture: Ni 3 1.3%; TFe 3 40.0%.
1.3 maturity and technical appraisal
Since 2002, the laboratory has conducted in-depth laboratory research on asbestos tailings (the main mineral component is serpentine) and serpentine mines; from 2004 to 2006, the SME Innovation Fund of the Ministry of Science and Technology and the local government of Gansu Province With the support of the establishment of a pilot line for the treatment of about 1 ton of asbestos tailings in Akesai Kazak Autonomous County, Gansu Province, more than three pilot and pilot productions were carried out; and in 2005, the technical achievements of the Ministry of Education were adopted. Identification, identification conclusions reached the international advanced level. At present, the acid leaching separation of magnesia from serpentine ore, separation of ferronickel products, preparation of ultrafine magnesium hydroxide and white carbon black, high specific surface area porous silica and high specific surface area silica adsorption characteristics, in wastewater The in-depth basic research has been carried out in the treatment, high-performance concrete, modified asphalt , etc., in core journals such as non-metallic minerals, process engineering journals, silicate journals, chemical minerals and processing, and Chinese science E. More than 10 papers were published at the 24th International Mineral Processing Conference, and many were included in SCI, EI, and ISTP.
The core content of the technology has obtained an invention patent ( a method for comprehensive utilization of asbestos tailings, 1 a method for preparing sheet-like nanometer magnesium hydroxide and spherical nano-silica using asbestos tailings, application number 200610140458.2, 2 discloses a method for preparing a siliceous porous material using asbestos tailings acid leaching residue, application No. 200810222081.4; 3 a method for comprehensively utilizing serpentine acid leach residue to fill modified road asphalt, application number 200910148507.0). The Intellectual Property Recognition Committee, which was jointly organized by the Science and Technology Department of Gansu Province, the Personnel Bureau and the Intellectual Property Office, was awarded the “Top Ten Outstanding Patentes during the 15th Period of Gansu Provinceâ€. Patent No. ZL03157398.3; Authorization Announcement Date November 2, 2005) and 3 invention patent applications (
1.4 Market prospects
The main products of this project (high-purity ultra-fine magnesium hydroxide, ultra-fine white carbon or porous silica) have good market prospects.
Due to its low smoke, non-toxicity, environmental friendliness and good filling properties, ultra-fine inorganic flame retardant will be the fastest-growing flame retardant material in the future. Ultra-fine magnesium hydroxide is the only inorganic pigment in the market after aluminum hydroxide. One of the flame retardants. It is predicted that the annual average demand growth rate of inorganic added flame retardants in the United States will reach about 7.5%, of which the growth rate of ultrafine magnesium hydroxide will reach about 10.0%; the average annual growth rate of inorganic additive flame retardants in Western Europe will be It reaches about 7.0%, among which, the average annual growth rate of magnesium hydroxide will reach 8.0%; the annual average demand growth rate of inorganic added flame retardants in China will reach about 12%, and the demand for inorganic added flame retardants in China in 2010 The amount will reach more than 240,000 tons, of which the demand for ultra-fine magnesium hydroxide will reach 80,000 tons. Therefore, ultrafine magnesium hydroxide has a good market prospect in the field of flame retardant materials. In addition, magnesium hydroxide can be further used to produce magnesium oxide and magnesium metal. Because of the special properties of magnesium metal magnesium castings in terms of pressure, especially in the automotive industry is very optimistic about the outlook for consumption is expected increment in the next few years will be the speed of 15% to 20%, the price will be bullish.
The ultra-fine magnesium hydroxide market positioning of this project: flame retardant for cable, plastic, coating materials and additives for (stone) oil (product).
Ultrafine white carbon black has been widely used in automotive tires, coatings, silicone rubber, special functional rubber, electronic information materials, functional chemical fiber materials, new plastic materials, resin composite materials, color inkjet printing paper and other fields. Moreover, the application range is wider and wider, and the usage is getting larger and larger. At present, domestic ordinary grade white carbon black can basically meet the domestic market demand, and some exports. However, the output of ultrafine white carbon black and nano white carbon black of about 1 μm is small. At present, the high-grade ultra-fine and nano-silicas required by the domestic market are mainly imported. With the continuous development of China's national economy and the rapid development of high-tech industries, the pace of transforming traditional materials and developing high-tech functional new materials and new products will accelerate, and ultra-fine and nano-silica as an important functional application. The demand for powder chemical materials will also grow rapidly. It is predicted that by 2010, the demand for ultrafine and nano -silica will reach 120,000 tons.
The ultra-fine white carbon black market positioning of this project: functional plastics, latex, silicone rubber, inkjet paper, chemical fiber fillers, paints, coatings and inks (thickeners and matting agents).
Porous silica has high specific surface area, developed mesopores and excellent adsorption activity. The application experiments show that the adsorption rates of five heavy metal ions such as Cu 2+ , Pb 2+ , Ni 2+ , Cd 2 + and Cr 3 + More than 95%, it is an excellent heavy metal ion adsorption removal material; at the same time has good activity, can be used for high performance concrete reinforcement filler (has been applied for system application test), road asphalt modified filler, etc., with broad market development prospect.
1.5 Economic benefits
Annual treatment of asbestos tailings or serpentine mines of 10,000 tons/year:
Scheme 1 (main products are ultra-fine magnesium hydroxide and ultra-fine white carbon black ) : The newly added output value is about 80 million yuan, the new profit and tax is about 15 million yuan; the investment is about 49 million yuan, and the static investment recovery period is about 5 year.
Scheme 2 (the main products are ultra-fine magnesium hydroxide and porous silica): the newly added output value is about 50 million yuan, the new profit and tax is about 10 million yuan; the investment is about 40 million yuan, and the static investment recovery period is about 5 years. .
1.6 Results application areas and production conditions
   An area with serpentine or asbestos tailings resources and water supply and power supply conditions.
1.7 Ways of cooperation
Transfer or use of proprietary technology (according to annual sales). Specific face.