Solution for sorting, processing and resource utilization of calcium carbide slag

Solution of calcium carbide slag sorting treatment and resource utilization

I. Problems and opportunities: from slag to resources

Calcium carbide slag is the industrial waste generated after the hydrolysis of calcium carbide (calcium carbide) to produce acetylene gas, the main component is calcium hydroxide, but some of the calcium carbide slag is often mixed with incompletely reacted particles of calcium carbide and ferrosilicon (FeSi) alloy particles as raw materials brought in. These ferrosilicon particles have high hardness and high specific gravity, which not only affects the process performance of subsequent resource utilization of calcium carbide slag, but also has a high recovery value itself.

This calcium carbide slag sorting treatment and resource utilization solutions are aimed at efficient, simple physical sorting process, priority recovery of calcium carbide slag in the ferrosilicon alloy, to achieve immediate economic benefits, and after sorting the pure calcium carbide slag to clear the obstacles and lay the foundation for high value-added resource utilization, and ultimately realize the calcium carbide slag, "eat up the clean".

Second, calcium carbide slag sorting process: screening - gravity separation, accurate recovery of ferrosilicon

For the characteristics of calcium carbide slag containing ferrosilicon, we adopt the mature and reliable "screening - jigging - dewatering" all physical separation process. The process requires no chemicals, uses water as the medium, is environmentally friendly, small investment and quick results.

1. Pre-treatment and screening classification

• Purpose: To classify the mixed calcium carbide slag according to particle size, to realize "narrow level" into the selection, to create the best conditions for efficient sorting, and preliminary separation of large pieces of ferrosilicon.

• Core equipment and process:

  • Feeding system: the loader will put calcium carbide slag into the silo, through the feeder uniformly fed into the trommel screen.

  • Tumbler screen: The material is accurately screened into three grain sizes:

    • >30mm: this granularity usually contains large lumps of ferrosilicon or calcium carbide, which are extruded out of the lumps of ferrosilicon by manual hand-selection, which is very efficient.

    • 8-30mm: into the large particle jigger sorting.

    • 0-8mm: into the fine grain jigger sorting.

2. Coreprocessstage: jigging gravity separation

• Principle: Utilizing the huge specific gravity difference between ferrosilicon (specific gravity 6.3-6.8) and calcium carbide slag (main component is Ca(OH)₂, specific gravity 2.2-2.3). Under the action of pulsating water flow generated by the jigger, the high specific gravity ferrosilicon particles sink to become concentrate, and the low specific gravity calcium carbide slag is separated as tailings.

• Core equipment:

  • Large particle jigger: processing 8-30mm particle size, recovering coarse-grained ferrosilicon.

  • Fine particle jigger: processing 0-8mm particle size, recovering medium and fine-grained ferrosilicon.

• Technical Advantages:

  • High recovery rate: excellent recovery of fully dissociated ferrosilicon.

  • No pollution: pure physical sorting, circulating water operation, environmental protection without pressure.

  • Stable operation: the equipment failure rate is very low, and can be operated continuously for a long time.

3. Product dewatering

• Jigging output of ferrosilicon concentrate and calcium carbide slag tailings into the dewatering screen for dewatering respectively, to get dry ferrosilicon products (can be sold directly) and clean calcium carbide slag raw materials.

[Important premise]: Before implementing this program, the calcium carbide slag raw material must be sampled and analyzed to confirm that it contains economically recoverable ferrosilicon particles. If it does not contain ferrosilicon, there is no need for this sorting process, and it can be used directly for subsequent resource utilization.

Third, the value of sublimation: purified calcium carbide slag high value utilization

After sorting and recovering ferrosilicon, the calcium carbide slag becomes purer in composition and more uniform in particle size, which is a high-quality pre-treatment raw material for its high-value utilization.

• Building materials field:

  • Cement raw materials: as a calcium raw material to replace limestone to produce cement, energy saving and carbon reduction, the technology is very mature.

  • Environmental protection building materials: production of calcium silicate boards, lightweight blocks, brick products and so on.

  • Cementitious materials: as the main raw material to prepare all solid waste filling cementitious materials, soil curing agent, road base materials, etc.

• Chemical industry and environmental protection field:

  • Flue gas desulfurization agent: substitute for lime for flue gas desulfurization in power plants, steel mills and so on.

  • Acidic wastewater neutralizer: used in treating acidic wastewater of mining and chemical industry.

• Core value:

  • Enhance quality and efficiency: After removing ferrosilicon, it greatly improves the grindability, reactivity and product stability of calcium carbide slag as raw material for building materials.

  • Cost advantage: calcium carbide slag is a free calcium resource, replacing natural limestone can significantly reduce production costs.

  • Green cycle: to achieve 100% resource utilization of industrial waste residue, perfect fit for the circular economy policy.

Fourth, calcium carbide slag treatment program features and advantages

1. Small investment, quick return: simple process, low investment cost of core equipment (trommel screen, jigger, etc.), and quick recovery of investment through the sale of ferrosilicon.

2. Simple and reliable process: based on years of practical experience in design, the equipment failure rate is extremely low, easy to operate and maintain, low operating costs.

3. Environmental protection without secondary pollution: all physical process, recycled water, without adding any chemicals, environmentally friendly.

4. Double benefits: not only through the recovery of ferrosilicon to obtain direct economic benefits, but also for the scale of calcium carbide slag, high-value utilization to pave the way, creating long-term stable income.

V. Service and Support

We can provide a full set of calcium carbide slag treatment program services from "raw material testing - feasibility analysis - process design - production line equipment supply - installation and commissioning guidance" to ensure the success of the project.

The solution of calcium carbide slag sorting treatment and resource utilization divides the treatment of calcium carbide slag into two steps: the first step is "taking treasure" (recovering ferrosilicon), and the second step is "using slag" (resource utilization). This is not only an environmental protection treatment project, but also a value-added resource project with great potential. We are willing to use our mature technology and rich experience to help you turn the burden of calcium carbide slag into a valuable resource, and realize the double harvest of economic and environmental benefits, welcome to contact us to get calcium carbide slag treatment plan and quotation.