Detailed Project Report (DPR) on silica from rice husk ash 20 mt/day

Detailed Project Report (DPR) on silica from rice husk ash 20 mt/day
4460
Original
India
Countries
Translation provided by Google AI

Industry Overview

Silica (SiO2) is a valuable inorganic compound available in gel, crystalline, and amorphous forms and is widely used across industrial applications. Conventional production of pure silica can be energy intensive and may require furnace temperatures exceeding 700 degree C. The project presents a chemical process for extracting precipitated silica from rice husk ash, a non-conventional raw material containing about 90-98% silica after complete combustion.

Rice husk is commonly used as boiler fuel, and its combustion generates ash that can create significant disposal, pollution, and health concerns around rice mills. The proposed process converts this waste into a valuable silica product while also enabling recovery of sodium sulphate from effluent wash water. Sodium sulphate can be recovered through evaporation, crystallization, filtration, and drying. Residue ash containing retained sodium silicate can also be used as a binder in the manufacture of quality bricks with suitable ingredients.

The report notes that approximately twenty five million tons of rice husk are obtained from rice mills in the country and are commonly burnt, generating substantial quantities of ash. It further indicates the potential to produce two million tons of pure high grade silica from rice husk to serve industries with significant silica demand. States identified as having large numbers of rice mills include Andhra Pradesh, Tamil Nadu, Karnataka, and Kerala.

Cost Estimation

Cost Parameter Value
Plant Cpacity 20 MT/Day
Land & Building (6000 sq.mt.) Rs. 3.43 Cr
Plant & Machinery Rs. 8.50 Cr
Working Capital for 2 Months Rs. 2.36 Cr
Total Capital Investment Rs. 14.54 Cr
Rate of Return 26%
Break Even Point 58%

Content Index

INTRODUCTION
RICE HUSK
CHEMICAL COMPOSITION OF RHA BEFORE AND AFTER BURNING OUT AT700°C FOR 6 H
BENEFITS OF PRECIPITATED SILICA FROM RHA
RAW MATERIALS
PRECIPITATED SILICA END-USE APPLICATIONS
USES AND APPLICATION OF PRECIPITATED SILICA
IMPORTANT APPLICATION SECTOR
OTHER SECTORS
APPLICATIONS
1. ADHESIVE:
2. CHAPPALS:
3. CONVEYOR BELT & TRANSMISSION BELT:
4. PVC SHEETS:
5. RAILWAY PADS:
6. RICE ROLLERS AND RUBBER ROLLERS:
7. RUBBER PRODUCTS AND RUBBER HOSES:
8. SILICON TUBES:
PRECIPITATED SILICA IS USED IN SILICON RUBBER FOR FOLLOWING REASONS:
9. RUBBER AND SOLID TYRES:
10. TEXTILE COTS AND APRONS:
NON RUBBER GRADE PRECIPITATED SILICA
APPLICATIONS
PESTICIDES:
PRINTING INK:
TOOTH PASTE AND TOOTH POWDER:
SALT:
COATINGS:
FIRE EXTINGUISHING POWDERS:
MARKET OVERVIEW OF PRECIPITATED SILICA
KEY TAKEAWAYS
INDIAN PRECIPITATED SILICA MARKET DRIVERS
LOWER ENVIRONMENTAL IMPACT AND EASY ACCESS OF RAW
MATERIAL (RICE HUSK ASH)
SURGING DEMAND FROM END USE INDUSTRIES
INDIAN PRECIPITATED SILICA MARKET CHALLENGES
PRESENCE OF SUBSTITUTES AND HARMFUL EFFECTS OF PRECIPITATED SILICA
MARKET LANDSCAPE
GLOBAL MARKET OF PRECIPITATED SILICA
ADVANTAGE OF RICE HUSK FOR PRECIPITATED SILICA
SILICA IN RICE HUSK
SPECIFICATION OF PRECIPITATED SILICA
IS SPECIFICATION
PROPERTIES OF RICE HUSK
A. PROPERTIES OF RAW MATERIAL
B. COMPOSITION OF RICE HUS
C. COMPOSITION OF RICE HUSK ASH
MANUFACTURING PROCESS OF PRECIPITATED SILICA FROM RICE
HUSK ASH (INDIAN INSTITUTE OF SCIENCE PRECIPITATED SILICA
TECHNOLOGY) CGPL PROCESS
DIGESTION
PRECIPITATION
REGENERATION
PROCESS FLOW DIAGRAM
SEQUENCES IN SILICA MANUFACTURE
CALCULATION:
FIGURE: PHOTOGRAPHS OF (A) RICE HUSK (B) RICE HUSK ASH (C) RICE
HUSK SILICA POWDER
DIGESTION
PRECIPITATION
REGENERATION
TYPICAL PROPERTIES OF PRECIPITATED SILICA
PROCESS FOR SILICA PRECIPITATION IN DETAILS
A. DIGESTION:
DIGESTION:
ENERGY
PRECIPITATION:
ENERGY
PRECIPITATED SILICA USING RICE HUSK ASH
4.1 DIGESTION
4.2 PRECIPITATION
4.3 REGENERATION
4.4 CALCINATION AND SLAKING
4.1 DIGESTION
4.2 PRECIPITATION
11. SURFACE AREA
12. TAP DENSITY
4.3 REGENERATION
4.4 CALCINATION AND SLAKING
TYPICAL PROPERTIES OF SILICA PRECIPITATED
ALTERNATE PROCESS OF SILICA MANUFACTURE
A. CONVENTIONAL
B. RICE HUSK, SUPERHEATED STEAM
C. RICE HUSK, HF, NH3
D. PROPOSED PROCESS
B. PROCESS DESCRIPTION
C. EXPERIMENTAL PROCEDURE
TECHNICAL DETAILS OF SILICA MANUFACTURE
DETAILED DESCRIPTION OF THE PROCESS IS AS FOLLOWS:
13. THE PRODUCT FORMATION
14. THE PURITY PRODUCTS
TECHNOLOGY SUPPLIERS FOR PRECIPITATED SILICA FROM RICE HUSK
COMPLETE PLANT AND MACHINERY SUPPLIERS
SUPPLIERS OF PLANT AND MACHINERIES
COMPLETE PLANT SUPPLIERS
SUPPLIERS OF FILTER PRESS
SUPPLIERS OF MINI BOILER
SUPPLIERS OF INDUSTRIAL DRYERS
SUPPLIERS OF STORAGE VESSEL
SUPPLIERS OF LABORATORY EQUIPMENTS
SUPPLIERS OF MATERIAL HANDLING EQUIPMENTS
SUPPLIERS OF INSTRUMENTATION AND PROCESS CONTROL EQUIPMENTS
SUPPLIERS OF PACKAGING MACHINE
HORIZONTAL PLATE FILTER PRESS (SPARKLER FILTERS)
SUPPLIERS OF RAW MATERIALS (GLOBAL)
SUPPLIERS OF RAW MATERIALS
SUPPLIERS OF RICE HUSK ASH
SUPPLIERS OF CAUSTIC SODA
SUPPLIERS OF SODIUM HYDROXIDE
SUPPLIERS OF CALCIUM HYDROXIDE
SUPPLIERS OF CARBON DIOXIDE GAS
SUPPLIERS OF PACKAGING MATERIALS (HDPE BAGS)

Appendix.

APPENDIX – A:
15. PLANT ECONOMICS
16. LAND & BUILDING
17. PLANT AND MACHINERY
18. OTHER FIXED ASSESTS
19. FIXED CAPITAL
20. RAW MATERIAL
21. SALARY AND WAGES
22. UTILITIES AND OVERHEADS
23. TOTAL WORKING CAPITAL
24. TOTAL CAPITAL INVESTMENT
25. COST OF PRODUCTION
26. TURN OVER/ANNUM
27. BREAK EVEN POINT
28. RESOURCES FOR FINANCE
29. INSTALMENT PAYABLE IN 5 YEARS
30. DEPRECIATION CHART FOR 5 YEARS
31. PROFIT ANALYSIS FOR 5 YEARS
32. PROJECTED BALANCE SHEET FOR (5 YEARS)

Frequently Asked Questions

Precipitated silica from rice husk ash is silica recovered through a chemical extraction and precipitation process using ash generated from rice husk combustion. Rice husk ash is particularly suitable because it can contain about 90-98% silica after complete combustion, according to the report. The process provides a route for converting an agricultural combustion residue into a commercially useful silica product while reducing the disposal burden associated with accumulated rice husk ash.

Rice husk ash is used because it is a silica-rich agricultural residue that can also present a significant disposal problem. When rice husk is burned completely, its ash can contain a high proportion of silica. Recovering silica from this material can therefore combine waste utilization with production of a valuable industrial chemical. The approach described in the report is intended to reduce ash disposal concerns while creating precipitated silica and enabling recovery of associated products.

Precipitated silica is used in a wide range of rubber and non-rubber applications. The report identifies uses including adhesives, chappals, conveyor and transmission belts, PVC sheets, railway pads, rollers, rubber products and hoses, silicon tubes, tyres, textile cots and aprons, pesticides, printing ink, toothpaste and tooth powder, salt, coatings, and fire extinguishing powders. Its applications depend on properties such as surface characteristics, particle behavior, purity, and other product specifications required by the end-use industry.

The report identifies digestion, precipitation, regeneration, and calcination and slaking among the principal stages of the silica manufacturing process. During processing, silica-containing material is chemically treated to enable separation and precipitation of the desired silica product. The report also discusses energy requirements, process sequences, alternative manufacturing routes, and process flow information. Exact operating conditions and equipment requirements depend on the selected process design and the required characteristics of the final precipitated silica.

Sodium sulphate is identified in the report as an associated recovery from the silica production process. Effluent wash water generated after washing precipitated silica contains sodium sulphate, which can be recovered by removing water through multiple effect evaporation followed by crystallization, filtration, and drying. The report also indicates that residue ash containing retained sodium silicate can potentially be used in brick manufacturing, where it can act as a binder when combined with suitable ingredients.

The project addresses rice husk ash disposal by converting the silica-rich residue into a useful industrial product. Rice husk is commonly burned as a boiler fuel, leaving ash that may accumulate around rice mills and contribute to pollution and health concerns. Instead of treating the ash solely as a waste material, the proposed process uses it as the feedstock for silica extraction. This creates a waste-to-value pathway in which an agricultural residue becomes a source of precipitated silica and associated recoveries.

The report specifies a plant capacity of 20 MT/Day and provides project-level financial figures for capital investment, working capital, rate of return, and break even point. It reports Land & Building (6000 sq.mt.) at Rs. 3.43 Cr, Plant & Machinery at Rs. 8.50 Cr, Working Capital for 2 Months at Rs. 2.36 Cr, Total Capital Investment at Rs. 14.54 Cr, Rate of Return at 26%, and Break Even Point at 58%. These figures are reproduced as provided in the project report without recalculation or modification.

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