What is a silica from rice husk project report?
A silica from rice husk project report is a detailed project report (DPR) for a plant that turns rice husk ash into fine amorphous silica. It covers the process, machinery, ash supply, market, project cost, five-year projections, DSCR and break-even that lenders and investors review.
Rice millers and chemical investors use it to raise a term loan, and banks use it to test whether ash supply and margins can carry the debt.
Also known as: rice husk ash silica project report, precipitated silica from rice husk ash DPR, silica from rice husk business plan, green silica plant project report.
Silica from rice husk manufacturing plant cost in India
Our sample report models a 5.2 metric tonnes per day plant running 330 days a year, or 1,716 MT per year at full capacity. It starts at 60% utilisation, reaches 80% in Year 5 and sells silica at ₹47,300 per MT, ex-GST.
| Land and site development | 36.32 |
|---|---|
| Building and civil works | 92.63 |
| Plant and machinery | 194.12 |
| Other fixed assets (electrification, lab equipment, DG set) | 31.29 |
| Contingencies | 14.34 |
| Preliminary and pre-operative | 9.22 |
| Working capital margin | 18.36 |
| Total | 396.28 |
| Promoter's contribution (25%) | 99.07 |
|---|---|
| Term loan from bank (75%) | 297.21 |
| Cash credit limit (separate) | 55.10 |
| Total project cost | 396.28 |
Plant and machinery is almost half the project cost, which is typical of a wet chemical plant with a dryer. DSCR (debt service coverage ratio) is the cash the plant earns for each rupee of loan instalment; the sample's lowest year is 1.64.
Term loan at 10.5% with a 6-month moratorium and 54 monthly instalments. All figures are illustrative.
Silica from rice husk manufacturing process
Rice husk ash is mostly amorphous silica, with unburnt carbon and minor minerals. The plant dissolves that silica in caustic soda and then rebuilds it as a pure, fine powder whose surface area you control.
- Ash receipt and testing
Each lot of ash is sieved and tested for silica and carbon content, because grey, high-carbon ash gives lower yield.
- Caustic digestion
Ash is cooked with caustic soda solution at around 100 °C in a stirred digester, dissolving the silica as sodium silicate.
- Silicate filtration
The sodium silicate liquor is filtered away from the black carbon-rich residue, which needs drying and a buyer or a disposal route.
- Precipitation
Sulphuric acid or carbon dioxide is added to the clear liquor under controlled pH and temperature, and silica comes out as a slurry.
- Filtering and washing
A filter press separates the silica cake, and washing removes sodium salts that would otherwise fail purity tests.
- Drying and packing
The cake is reslurried and spray dried into a free-flowing powder, then packed in multi-wall paper or HDPE bags.
Acid route or CO2 route: which process should you choose?
The choice of precipitating agent decides your chemical bill, your effluent and part of your capital cost. Our sample report uses the sulphuric acid route; IISc Bangalore has developed a CO2 route that recycles the caustic.
| Point to compare | Sulphuric acid route | CO2 route with caustic recovery |
|---|---|---|
| Precipitating agent | Sulphuric acid, bought in tankers | Carbon dioxide gas, bubbled through the liquor with stirring |
| By-product | Sodium sulphate in the wash water | Sodium carbonate, reacted with lime to give caustic soda and calcium carbonate |
| Caustic soda use | Fresh caustic for every batch | Up to 90% of caustic recovered, as published by IISc |
| Equipment | Simpler, fewer vessels | Extra causticiser, lime handling and gas system |
| Best fit | Smaller plants that want a proven, simple line | Larger plants where chemical savings repay the extra equipment |
Rice husk ash and chemicals: the raw material bill
Husk is about one fifth of paddy by weight, and it leaves about 18–20% ash when burnt in rice mill and power plant boilers. That ash typically carries 80–90% silica. IISc's published process needs about 1.6 tonnes of ash per tonne of silica.
| Raw material | Share of cost | Year 3 (₹ lakh) |
|---|---|---|
| Rice husk ash | 40% | 100.51 |
| Caustic soda | 35% | 87.94 |
| Sulphuric acid | 25% | 62.82 |
| Total | 100% | 251.27 |
Chemicals cost more than ash: in the sample, caustic soda and acid together make up 60% of the raw material bill. Caustic recovery or tight dosing control moves profit more than a cheaper ash contract.
Machinery for a rice husk silica plant
Wetted parts face hot caustic on one side and acid on the other, so vessels are usually stainless steel or rubber-lined. The reactors and spray dryer are the two largest items in the sample, at ₹48.53 lakh each.
| Machine | What it does | Sample cost (₹ lakh) |
|---|---|---|
| Digester | Cooks ash with caustic soda to form sodium silicate | 38.83 |
| Reactors | Precipitate silica from the silicate liquor under pH control | 48.53 |
| Filter press | Separates residue and silica cake; washes out salts | 38.82 |
| Spray dryer | Turns washed slurry into fine dry powder | 48.53 |
| Packing | Weighs and bags the finished silica | 19.41 |
| Total plant and machinery | 194.12 | |
Costs are the sample report's estimates for a 5.2 MT per day line. Get current quotations before you finalise.
Utilities, manpower and site for a silica plant
Heat is the utility that matters most. Digestion runs near boiling and the spray dryer needs hot air, so many plants burn rice husk itself for steam and drying.
| Power and fuel | ₹29.34 lakh in Year 3 in the sample, 5.2% of sales |
|---|---|
| Water | Process water for digestion, precipitation and cake washing, plus a treatment plant for the salty wash water |
| Manpower | 18 people in the sample: 3 in management and supervision, 6 skilled operators, 9 semi-skilled and unskilled, at ₹41.04 lakh in Year 1 |
| Land and building | ₹36.32 lakh for land and ₹92.63 lakh for building and civil works in the sample, with covered storage for ash and chemicals |
| Laboratory | Tests for silica content, surface area, pH, loss on ignition and moisture on every batch |
Licences and approvals for a silica from rice husk plant
| Business registration | Udyam (MSME) registration and GST registration |
|---|---|
| Pollution board consent | Consent to establish and operate from the State Pollution Control Board. CPCB criteria place silica gel manufacture in the Orange category; confirm the category for a precipitated silica plant with your state board |
| Product standard | IS 12076:2026, the BIS specification for precipitated silica for the rubber industry, which replaced the 1986 edition |
| Factory licence | Under the Factories Act or the state's labour code rules, where worker thresholds apply |
| Boiler and fire safety | Boiler registration with the state boiler inspectorate if you install a steam boiler, and a fire NOC where required |
Rules differ by state. Check current requirements with each department before you apply.
Who buys silica from rice husk?
Most precipitated silica goes into rubber, where it reinforces tyre treads and moulded goods. Tyre makers are adding silica from renewable sources to meet their carbon targets. That gives rice husk ash silica a selling point that sand-based silica lacks.
- Tyre manufacturers, for tread and green tyre compounds
- Rubber footwear and moulded rubber goods makers
- Toothpaste and oral care makers, as a cleaning and thickening agent
- Paint and coating makers, as a thickener and matting agent
- Feed premix, salt and agrochemical makers, as an anti-caking carrier
Location decides margin: ash is light, bulky and low in value, so it rarely pays to truck it far. A plant inside a rice-milling cluster buys ash cheaper and steadier than one that has to haul it.
Mistakes that weaken a silica from rice husk project report
- Treating all ash as the same
Black, high-carbon ash from poorly run boilers yields less silica and a greyer product. Yield in the report should rest on tests of the ash you will actually buy.
- Pricing every tonne as tyre grade
High surface area tyre grades fetch the best price but need tight control and buyer approval trials. A new plant usually sells general rubber and paint grades first.
- Under-stating caustic soda use
Caustic is the second largest raw material cost in the sample. A report that assumes recovery without the recovery equipment shows profit the plant will not earn.
- No plan for wash water and residue
Sodium sulphate in wash water and the carbon residue both need treatment or a buyer. Leaving them out is a common reason pollution consent gets delayed.
- Relying on one ash supplier
Rice mill boilers stop in lean months and ash prices rise as other users compete for it. Lenders look for at least two sources and some stock.
How NPCS helps you set up a silica from rice husk plant
- Process route and gradeCompare the acid and CO2 routes and pick grades that match buyers in your region.
- Ash supply studyMap rice mills and husk-fired boilers around your site and plan ash testing.
- Bank-ready project reportProjections, DSCR and working capital in the format your lender or investor wants.
- Machinery, layout and approvalsEquipment list, plant layout, effluent plan and the consent list for your state.
NPCS's client list includes 14 assignments for silica from rice husk. The NPCS project team, led by founder Ajay Kumar Gupta, has prepared reports for specialty chemical plants since 1994.
What's inside the silica from rice husk sample report
- Introduction
- Uses and applications
- Market potential
- Manufacturing process
- Raw materials
- Plant and machinery
- Land, building and utilities
- Manpower
- Licences and approvals
- Project cost and means of finance
- Working capital
- Projected profitability
- Cash flow statement
- Projected balance sheet
- Depreciation
- Term loan repayment
- Debt service coverage
- Break-even analysis
- Financial ratios
- Key assumptions
- Conclusion
- Monthly loan repayment schedule
18 pages, five-year projections, illustrative figures.
Open sample reportFree sample or a report for your project?
| What you get | Free sample | NPCS report for your project |
|---|---|---|
| Capacity and location | Typical unit | Your capacity, site and state |
| Figures | Illustrative | Built on current prices and quotations |
| Machinery suppliers and quotations | No | Yes |
| Market survey for your region | No | Yes |
| Bank or scheme format (PMEGP, term loan) | No | Yes |
| Use for a loan application | No | Yes |
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Silica from Rice Husk project report: frequently asked questions
How much does it cost to set up a silica from rice husk plant in India?
Our sample report models a 5.2 MT per day plant at a total project cost of ₹396 lakh. That includes ₹194 lakh of plant and machinery, plus land, building and working capital margin. Your cost will move with capacity, the process route, the dryer you choose and land prices in your state, so treat the sample as a format, not a quote.
How is silica extracted from rice husk ash?
The ash is boiled with caustic soda solution, which dissolves its silica as sodium silicate. The liquid is filtered off the carbon residue, then acid or carbon dioxide is added under control so silica precipitates. The silica is filtered, washed free of salts, dried, usually in a spray dryer, and packed in bags.
How much silica can you get from one tonne of rice husk ash?
Research at IISc Bangalore reports about 70% conversion on an ash basis and 90–95% recovery of the silica present in the ash. In plant terms, its published process needs about 1.6 tonnes of ash for each tonne of silica. Actual yield depends on the ash: high unburnt carbon or low silica content means more ash per tonne.
Is a rice husk silica plant profitable?
In our illustrative sample, a 5.2 MT per day plant earns ₹91 lakh net profit on ₹568 lakh sales in Year 3. That is a 23% return on investment, with break-even at 36% of capacity. Real profit depends on the landed price of ash, caustic soda consumption, dryer fuel and whether you can sell a consistent grade to rubber or oral care buyers.
What is silica from rice husk used for?
Precipitated silica from rice husk ash goes mainly into tyres and rubber goods as a reinforcing filler. It is also used as a cleaning agent in toothpaste, a thickener in paints, an anti-caking agent in food and salt, and in cosmetics. Each use needs its own grade, set by surface area, purity and particle size.
Rice husk se silica banane ka business kaise shuru kare?
Start by securing an ash supply from nearby rice mills or husk-fired boilers and getting a few samples tested for silica and carbon content. Then choose the acid or CO2 process route, get a project report on silica from rice husk with machinery quotations, apply for pollution consent and arrange a term loan. Line up trial orders with rubber or paint buyers early.
Is the silica from rice husk project report PDF free, and can I use it for a loan?
The sample is free to view and download. It is an illustrative report showing the format and depth of an NPCS report. Its figures are representative and not based on a real project, so do not submit it to a bank. For a loan, NPCS prepares a report for your own capacity, location and process route.
Sources and references
- Precipitated silica technology (IPSIT)Combustion, Gasification and Propulsion Laboratory, Indian Institute of Science, checked Oct 2026
- Precipitated silica from rice husk ash: process and indicative economicsCombustion, Gasification and Propulsion Laboratory, Indian Institute of Science, checked Oct 2026
- Precipitated silica from rice husk ash by IPSIT process (conference paper, 2007)Indian Institute of Science, Bangalore, checked Oct 2026
- IS 12076:2026 Precipitated silica for rubber industry: specificationBureau of Indian Standards, checked Oct 2026
- Categorisation of industrial sectors under Orange as per CPCB criteriaState Pollution Control Board, Odisha, checked Oct 2026
- Recovery of energy, amorphous silica and other products through pyrolysis of rice huskTechnology Information, Forecasting and Assessment Council (TIFAC), checked Oct 2026
The NPCS project team, led by Ajay Kumar Gupta
This page and its sample report are prepared and reviewed by the NPCS project team, which has written techno-economic feasibility studies and detailed project reports since 1994.
Ajay Kumar Gupta founded Niir Project Consultancy Services (NPCS) and leads the organisation. With 40 years of experience in MSME project consulting, he has built the team that has delivered more than 28,000 project reports for clients worldwide, helping entrepreneurs plan and finance profitable manufacturing businesses.
- Published
- Last updated
- Next review
- Oct 2027
- Reviewed by
- NPCS project team
This page is reviewed every 12 months, or sooner when scheme limits, GST rates, BIS rules or pollution categories change. The sample report is illustrative: its figures are generated from industry-typical ratios for a unit of this size, checked so every statement balances, and are not taken from any client project.