What is Bentonite?
Bentonite generally has a hardness of 1 to 2 (there are also relatively hard ones) and a density of 2 to 3g/cm3. It is a non-metallic mineral with montmorillonite as the main mineral component, generally white or light yellow, and light gray, light green, pink, brown due to changes in iron content Red, brick red, gray black, etc. According to the different fineness, bentonite can be used in biological supply, food, medicine, textile, light industry, metallurgy, and other high-end chemical additives, petroleum, drilling, sewage treatment and other industries. It can be said that it has a wide range of uses and its value penetrates in various in the industry.
Bentonite processing plant
As we can see from the above information that bentonite powder has wide applications. And in order to get bentonite powder, we need bentonite processing plant.
At present, the technological process of bentonite processing mainly includes the following three types:
1. The process of artificial sodiumization of calcium bentonite:
Calcium-based soil raw ore → crushing → adding sodium carbonate (wet method also needs to add water) → mixing extrusion → rotary kiln drying → grinding → air classification → sodium-based soil products.
2. The processing flow of active (acidic) clay:
Bentonite → crushing → adding hydrochloric acid or sulfuric acid (wet method needs adding water and dispersing agent) → fully stirring → mixing extrusion → rotary kiln drying → heating air grinding → air classification → storage.
3. The process of organic bentonite processing:
Raw ore → crushing → dispersion → modification (sodiumization) → purification → ammonium salt covering → rinsing → dehydration → drying → crushing → packaging.
In the following part, we introduce the process of artificial sodiumization of calcium bentonite in detail:
1. Sodiumization stage: Most of the bentonite in nature is calcium-based bentonite, which has poor performance compared with sodium-based bentonite.
2. Drying stage: The sodium bentonite has high moisture content and needs to be dried by a dryer to smaller moisture content.
3. Grinding stage: the dried bentonite is crushed to meet the feeding requirements of the grinding mill, and the ore is lifted to the storage hopper by the elevator, and then uniformly fed to the main machine of the grinding mill by the electromagnetic vibrating feeder for grinding.
4. Grading stage: The pulverized materials are classified by the powder separator with the air flow of the system, and the unqualified powder is classified by the powder separator and then returned to the main grinding chamber for re-grinding.
5. Powder collection stage: the powder that meets the fineness enters the powder collection system with the air flow through the pipeline, the air powder is separated, and the finished powder is sent to the finished product silo by the conveying device, and then uniformly packed with a powder tanker or an automatic baler.
Bentonite processing equipment
In bentonite processing plant, grinding mill plays very important role. SBM can provide many types and models of grinding mills for customers to choose.
Max. Input Size: 35mm
Min. Output Size: 0.038mm
Max. Capacity: 22t/h
Min. Power: 37Kw
Trapezium Mill absorbs many advantages from various mills all over the world:
From block material to finished powder, it forms a production system independently, with less one-time investment.
Compared with the traditional Raymond mill, the grinding roller and the grinding ring of trapezium mill are designed in a multi-step ladder shape, which reduces the sliding speed of the material between the trapezoidal grinding roller and the grinding ring, prolongs the rolling time of the material, and improves the finished product fineness and yield.
A convenient modularized impeller adjusting device is adopted, so that the gap between the end of the separator blade and the shell can be adjusted easily and quickly, and only need to replace the high-density impeller, users can produce different fineness products, to meet the different market needs.
Trapezium mill adopts high efficiency impeller type energy-saving fan, its working efficiency can reach 85% or even higher, under the same production requirements, powder selection is better, lower power consumption.
LM vertical roller mill
LM vertical roller mill has excellent performance both in domestic and foreign markets.
LM vertical roller mill is a kind of comprehensive large-scale grinding equipment integrating five functions of crushing, grinding, powder selection, drying and material conveying. It has the characteristics of concentrated process flow, small footprint, low investment, high efficiency, energy saving, environmental protection and many other features.
XZM ultrafine mill
XZM ultrafine mill, absorbs Sweden's advanced machinery manufacturing technology is a new type of ultrafine powder (325-2500 mesh) processing equipment that developed on the basis of years of experience of testing and improvement, which absorb Sweden's advanced machinery manufacturing technology. No matter in terms of production efficiency, operating cost, product fineness, environmental protection level, etc., XZM ultrafine mill is far superior to similar products.
And it has the following advantages:
More mature grinding curve, higher production capacity, and lower energy consumption;
Cage type powder separator is adopted, and the fineness can be adjusted arbitrarily between 325-2500 mesh;
Rolling bearings are adopted in the core part, no screws, safer operation of the equipment;
Pulse dust removal, high environmental protection level.
What is bentonite used for?
Bentonite resources in China are very rich, covering 26 provinces and cities. The reserves are the first in the world and the quality is excellent, but the development and application are very few. With environmental problem become a big problem, bentonite is used as an adsorbent for harmful substances, a clarifying agent for turbid water, a sealant for radioactive waste and toxic materials, a waterproofing agent for polluted water, a sewage treatment agent, and a washing aid. etc., the role in environmental protection is becoming more and more obvious, and the market demand has been rising in recent years. In addition, the application of bentonite in petrochemical, light industry and agricultural fields is also very important.
1. Drilling project
At present, bentonite used as a drilling mud material accounts for about 18% of the entire bentonite industry.
2. Wastewater treatment
Powdered bentonite has become a high-quality mineral material for wastewater treatment due to its large specific surface area, excellent adsorption performance and ion exchange performance.
3. Metallurgical Engineering
Bentonite has good dispersion, suspension and cohesion, and is widely used in blast furnace ironmaking raw materials - pellet production.
4. Building materials
Bentonite can absorb more than its own weight of water, so that its volume expands to several times or even tens of times of the original volume. After absorbing water to a certain extent, bentonite is equivalent to a kind of colloid, which has the property of water exclusion. Using this characteristic, bentonite can be used in waterproof materials.
5. Agriculture, forestry and animal husbandry
Bentonite is used in agriculture and forestry as a soil conditioner. Bentonite can reduce the flushing of fertilizers by water and improve the accumulation capacity of fertilizers and water, thereby improving soil and increasing crop yields.
Bentonite is used in animal husbandry as a feed additive, which can slow down the passage of feed in the gastrointestinal tract, and promote the livestock and poultry to fully digest the feed, so as to achieve the highest nutrient intake rate.
6. Pharmaceutical and food processing industry
Bentonite has good water absorption, suspension, dispersibility, cohesion, and thixotropy, and is used in the pharmaceutical industry as an auxiliary material and a pharmaceutical carrier.
Bentonite has good adsorption and ion exchange properties and is widely used in the food industry.